aboutsummaryrefslogtreecommitdiff
path: root/git-cvsserver.perl
blob: a33a876ff652fea5a0a8933b919982557a7093de (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
#!/usr/bin/perl

####
#### This application is a CVS emulation layer for git.
#### It is intended for clients to connect over SSH.
#### See the documentation for more details.
####
#### Copyright The Open University UK - 2006.
####
#### Authors: Martyn Smith    <martyn@catalyst.net.nz>
####          Martin Langhoff <martin@catalyst.net.nz>
####
####
#### Released under the GNU Public License, version 2.
####
####

use strict;
use warnings;
use bytes;

use Fcntl;
use File::Temp qw/tempdir tempfile/;
use File::Basename;

my $log = GITCVS::log->new();
my $cfg;

my $DATE_LIST = {
    Jan => "01",
    Feb => "02",
    Mar => "03",
    Apr => "04",
    May => "05",
    Jun => "06",
    Jul => "07",
    Aug => "08",
    Sep => "09",
    Oct => "10",
    Nov => "11",
    Dec => "12",
};

# Enable autoflush for STDOUT (otherwise the whole thing falls apart)
$| = 1;

#### Definition and mappings of functions ####

my $methods = {
    'Root'            => \&req_Root,
    'Valid-responses' => \&req_Validresponses,
    'valid-requests'  => \&req_validrequests,
    'Directory'       => \&req_Directory,
    'Entry'           => \&req_Entry,
    'Modified'        => \&req_Modified,
    'Unchanged'       => \&req_Unchanged,
    'Questionable'    => \&req_Questionable,
    'Argument'        => \&req_Argument,
    'Argumentx'       => \&req_Argument,
    'expand-modules'  => \&req_expandmodules,
    'add'             => \&req_add,
    'remove'          => \&req_remove,
    'co'              => \&req_co,
    'update'          => \&req_update,
    'ci'              => \&req_ci,
    'diff'            => \&req_diff,
    'log'             => \&req_log,
    'rlog'            => \&req_log,
    'tag'             => \&req_CATCHALL,
    'status'          => \&req_status,
    'admin'           => \&req_CATCHALL,
    'history'         => \&req_CATCHALL,
    'watchers'        => \&req_CATCHALL,
    'editors'         => \&req_CATCHALL,
    'annotate'        => \&req_annotate,
    'Global_option'   => \&req_Globaloption,
    #'annotate'        => \&req_CATCHALL,
};

##############################################


# $state holds all the bits of information the clients sends us that could
# potentially be useful when it comes to actually _doing_ something.
my $state = { prependdir => '' };
$log->info("--------------- STARTING -----------------");

my $TEMP_DIR = tempdir( CLEANUP => 1 );
$log->debug("Temporary directory is '$TEMP_DIR'");

# if we are called with a pserver argument,
# deal with the authentication cat before entering the
# main loop
if (@ARGV && $ARGV[0] eq 'pserver') {
    my $line = <STDIN>; chomp $line;
    unless( $line eq 'BEGIN AUTH REQUEST') {
       die "E Do not understand $line - expecting BEGIN AUTH REQUEST\n";
    }
    $line = <STDIN>; chomp $line;
    req_Root('root', $line) # reuse Root
       or die "E Invalid root $line \n";
    $line = <STDIN>; chomp $line;
    unless ($line eq 'anonymous') {
       print "E Only anonymous user allowed via pserver\n";
       print "I HATE YOU\n";
    }
    $line = <STDIN>; chomp $line;    # validate the password?
    $line = <STDIN>; chomp $line;
    unless ($line eq 'END AUTH REQUEST') {
       die "E Do not understand $line -- expecting END AUTH REQUEST\n";
    }
    print "I LOVE YOU\n";
    # and now back to our regular programme...
}

# Keep going until the client closes the connection
while (<STDIN>)
{
    chomp;

    # Check to see if we've seen this method, and call appropriate function.
    if ( /^([\w-]+)(?:\s+(.*))?$/ and defined($methods->{$1}) )
    {
        # use the $methods hash to call the appropriate sub for this command
        #$log->info("Method : $1");
        &{$methods->{$1}}($1,$2);
    } else {
        # log fatal because we don't understand this function. If this happens
        # we're fairly screwed because we don't know if the client is expecting
        # a response. If it is, the client will hang, we'll hang, and the whole
        # thing will be custard.
        $log->fatal("Don't understand command $_\n");
        die("Unknown command $_");
    }
}

$log->debug("Processing time : user=" . (times)[0] . " system=" . (times)[1]);
$log->info("--------------- FINISH -----------------");

# Magic catchall method.
#    This is the method that will handle all commands we haven't yet
#    implemented. It simply sends a warning to the log file indicating a
#    command that hasn't been implemented has been invoked.
sub req_CATCHALL
{
    my ( $cmd, $data ) = @_;
    $log->warn("Unhandled command : req_$cmd : $data");
}


# Root pathname \n
#     Response expected: no. Tell the server which CVSROOT to use. Note that
#     pathname is a local directory and not a fully qualified CVSROOT variable.
#     pathname must already exist; if creating a new root, use the init
#     request, not Root. pathname does not include the hostname of the server,
#     how to access the server, etc.; by the time the CVS protocol is in use,
#     connection, authentication, etc., are already taken care of. The Root
#     request must be sent only once, and it must be sent before any requests
#     other than Valid-responses, valid-requests, UseUnchanged, Set or init.
sub req_Root
{
    my ( $cmd, $data ) = @_;
    $log->debug("req_Root : $data");

    $state->{CVSROOT} = $data;

    $ENV{GIT_DIR} = $state->{CVSROOT} . "/";
    unless (-d $ENV{GIT_DIR} && -e $ENV{GIT_DIR}.'HEAD') {
       print "E $ENV{GIT_DIR} does not seem to be a valid GIT repository\n";
        print "E \n";
        print "error 1 $ENV{GIT_DIR} is not a valid repository\n";
       return 0;
    }

    my @gitvars = `git-repo-config -l`;
    if ($?) {
       print "E problems executing git-repo-config on the server -- this is not a git repository or the PATH is not set correctly.\n";
        print "E \n";
        print "error 1 - problem executing git-repo-config\n";
       return 0;
    }
    foreach my $line ( @gitvars )
    {
        next unless ( $line =~ /^(.*?)\.(.*?)=(.*)$/ );
        $cfg->{$1}{$2} = $3;
    }

    unless ( defined ( $cfg->{gitcvs}{enabled} ) and $cfg->{gitcvs}{enabled} =~ /^\s*(1|true|yes)\s*$/i )
    {
        print "E GITCVS emulation needs to be enabled on this repo\n";
        print "E the repo config file needs a [gitcvs] section added, and the parameter 'enabled' set to 1\n";
        print "E \n";
        print "error 1 GITCVS emulation disabled\n";
        return 0;
    }

    if ( defined ( $cfg->{gitcvs}{logfile} ) )
    {
        $log->setfile($cfg->{gitcvs}{logfile});
    } else {
        $log->nofile();
    }

    return 1;
}

# Global_option option \n
#     Response expected: no. Transmit one of the global options `-q', `-Q',
#     `-l', `-t', `-r', or `-n'. option must be one of those strings, no
#     variations (such as combining of options) are allowed. For graceful
#     handling of valid-requests, it is probably better to make new global
#     options separate requests, rather than trying to add them to this
#     request.
sub req_Globaloption
{
    my ( $cmd, $data ) = @_;
    $log->debug("req_Globaloption : $data");
    $state->{globaloptions}{$data} = 1;
}

# Valid-responses request-list \n
#     Response expected: no. Tell the server what responses the client will
#     accept. request-list is a space separated list of tokens.
sub req_Validresponses
{
    my ( $cmd, $data ) = @_;
    $log->debug("req_Validresponses : $data");

    # TODO : re-enable this, currently it's not particularly useful
    #$state->{validresponses} = [ split /\s+/, $data ];
}

# valid-requests \n
#     Response expected: yes. Ask the server to send back a Valid-requests
#     response.
sub req_validrequests
{
    my ( $cmd, $data ) = @_;

    $log->debug("req_validrequests");

    $log->debug("SEND : Valid-requests " . join(" ",keys %$methods));
    $log->debug("SEND : ok");

    print "Valid-requests " . join(" ",keys %$methods) . "\n";
    print "ok\n";
}

# Directory local-directory \n
#     Additional data: repository \n. Response expected: no. Tell the server
#     what directory to use. The repository should be a directory name from a
#     previous server response. Note that this both gives a default for Entry
#     and Modified and also for ci and the other commands; normal usage is to
#     send Directory for each directory in which there will be an Entry or
#     Modified, and then a final Directory for the original directory, then the
#     command. The local-directory is relative to the top level at which the
#     command is occurring (i.e. the last Directory which is sent before the
#     command); to indicate that top level, `.' should be sent for
#     local-directory.
sub req_Directory
{
    my ( $cmd, $data ) = @_;

    my $repository = <STDIN>;
    chomp $repository;


    $state->{localdir} = $data;
    $state->{repository} = $repository;
    $state->{path} = $repository;
    $state->{path} =~ s/^$state->{CVSROOT}\///;
    $state->{module} = $1 if ($state->{path} =~ s/^(.*?)(\/|$)//);
    $state->{path} .= "/" if ( $state->{path} =~ /\S/ );

    $state->{directory} = $state->{localdir};
    $state->{directory} = "" if ( $state->{directory} eq "." );
    $state->{directory} .= "/" if ( $state->{directory} =~ /\S/ );

    if ( (not defined($state->{prependdir}) or $state->{prependdir} eq '') and $state->{localdir} eq "." and $state->{path} =~ /\S/ )
    {
        $log->info("Setting prepend to '$state->{path}'");
        $state->{prependdir} = $state->{path};
        foreach my $entry ( keys %{$state->{entries}} )
        {
            $state->{entries}{$state->{prependdir} . $entry} = $state->{entries}{$entry};
            delete $state->{entries}{$entry};
        }
    }

    if ( defined ( $state->{prependdir} ) )
    {
        $log->debug("Prepending '$state->{prependdir}' to state|directory");
        $state->{directory} = $state->{prependdir} . $state->{directory}
    }
    $log->debug("req_Directory : localdir=$data repository=$repository path=$state->{path} directory=$state->{directory} module=$state->{module}");
}

# Entry entry-line \n
#     Response expected: no. Tell the server what version of a file is on the
#     local machine. The name in entry-line is a name relative to the directory
#     most recently specified with Directory. If the user is operating on only
#     some files in a directory, Entry requests for only those files need be
#     included. If an Entry request is sent without Modified, Is-modified, or
#     Unchanged, it means the file is lost (does not exist in the working
#     directory). If both Entry and one of Modified, Is-modified, or Unchanged
#     are sent for the same file, Entry must be sent first. For a given file,
#     one can send Modified, Is-modified, or Unchanged, but not more than one
#     of these three.
sub req_Entry
{
    my ( $cmd, $data ) = @_;

    #$log->debug("req_Entry : $data");

    my @data = split(/\//, $data);

    $state->{entries}{$state->{directory}.$data[1]} = {
        revision    => $data[2],
        conflict    => $data[3],
        options     => $data[4],
        tag_or_date => $data[5],
    };

    $log->info("Received entry line '$data' => '" . $state->{directory} . $data[1] . "'");
}

# Questionable filename \n
#     Response expected: no. Additional data: no. Tell the server to check
#     whether filename should be ignored, and if not, next time the server
#     sends responses, send (in a M response) `?' followed by the directory and
#     filename. filename must not contain `/'; it needs to be a file in the
#     directory named by the most recent Directory request.
sub req_Questionable
{
    my ( $cmd, $data ) = @_;

    $log->debug("req_Questionable : $data");
    $state->{entries}{$state->{directory}.$data}{questionable} = 1;
}

# add \n
#     Response expected: yes. Add a file or directory. This uses any previous
#     Argument, Directory, Entry, or Modified requests, if they have been sent.
#     The last Directory sent specifies the working directory at the time of
#     the operation. To add a directory, send the directory to be added using
#     Directory and Argument requests.
sub req_add
{
    my ( $cmd, $data ) = @_;

    argsplit("add");

    my $addcount = 0;

    foreach my $filename ( @{$state->{args}} )
    {
        $filename = filecleanup($filename);

        unless ( defined ( $state->{entries}{$filename}{modified_filename} ) )
        {
            print "E cvs add: nothing known about `$filename'\n";
            next;
        }
        # TODO : check we're not squashing an already existing file
        if ( defined ( $state->{entries}{$filename}{revision} ) )
        {
            print "E cvs add: `$filename' has already been entered\n";
            next;
        }

        my ( $filepart, $dirpart ) = filenamesplit($filename, 1);

        print "E cvs add: scheduling file `$filename' for addition\n";

        print "Checked-in $dirpart\n";
        print "$filename\n";
        print "/$filepart/0///\n";

        $addcount++;
    }

    if ( $addcount == 1 )
    {
        print "E cvs add: use `cvs commit' to add this file permanently\n";
    }
    elsif ( $addcount > 1 )
    {
        print "E cvs add: use `cvs commit' to add these files permanently\n";
    }

    print "ok\n";
}

# remove \n
#     Response expected: yes. Remove a file. This uses any previous Argument,
#     Directory, Entry, or Modified requests, if they have been sent. The last
#     Directory sent specifies the working directory at the time of the
#     operation. Note that this request does not actually do anything to the
#     repository; the only effect of a successful remove request is to supply
#     the client with a new entries line containing `-' to indicate a removed
#     file. In fact, the client probably could perform this operation without
#     contacting the server, although using remove may cause the server to
#     perform a few more checks. The client sends a subsequent ci request to
#     actually record the removal in the repository.
sub req_remove
{
    my ( $cmd, $data ) = @_;

    argsplit("remove");

    # Grab a handle to the SQLite db and do any necessary updates
    my $updater = GITCVS::updater->new($state->{CVSROOT}, $state->{module}, $log);
    $updater->update();

    #$log->debug("add state : " . Dumper($state));

    my $rmcount = 0;

    foreach my $filename ( @{$state->{args}} )
    {
        $filename = filecleanup($filename);

        if ( defined ( $state->{entries}{$filename}{unchanged} ) or defined ( $state->{entries}{$filename}{modified_filename} ) )
        {
            print "E cvs remove: file `$filename' still in working directory\n";
            next;
        }

        my $meta = $updater->getmeta($filename);
        my $wrev = revparse($filename);

        unless ( defined ( $wrev ) )
        {
            print "E cvs remove: nothing known about `$filename'\n";
            next;
        }

        if ( defined($wrev) and $wrev < 0 )
        {
            print "E cvs remove: file `$filename' already scheduled for removal\n";
            next;
        }

        unless ( $wrev == $meta->{revision} )
        {
            # TODO : not sure if the format of this message is quite correct.
            print "E cvs remove: Up to date check failed for `$filename'\n";
            next;
        }


        my ( $filepart, $dirpart ) = filenamesplit($filename, 1);

        print "E cvs remove: scheduling `$filename' for removal\n";

        print "Checked-in $dirpart\n";
        print "$filename\n";
        print "/$filepart/-1.$wrev///\n";

        $rmcount++;
    }

    if ( $rmcount == 1 )
    {
        print "E cvs remove: use `cvs commit' to remove this file permanently\n";
    }
    elsif ( $rmcount > 1 )
    {
        print "E cvs remove: use `cvs commit' to remove these files permanently\n";
    }

    print "ok\n";
}

# Modified filename \n
#     Response expected: no. Additional data: mode, \n, file transmission. Send
#     the server a copy of one locally modified file. filename is a file within
#     the most recent directory sent with Directory; it must not contain `/'.
#     If the user is operating on only some files in a directory, only those
#     files need to be included. This can also be sent without Entry, if there
#     is no entry for the file.
sub req_Modified
{
    my ( $cmd, $data ) = @_;

    my $mode = <STDIN>;
    chomp $mode;
    my $size = <STDIN>;
    chomp $size;

    # Grab config information
    my $blocksize = 8192;
    my $bytesleft = $size;
    my $tmp;

    # Get a filehandle/name to write it to
    my ( $fh, $filename ) = tempfile( DIR => $TEMP_DIR );

    # Loop over file data writing out to temporary file.
    while ( $bytesleft )
    {
        $blocksize = $bytesleft if ( $bytesleft < $blocksize );
        read STDIN, $tmp, $blocksize;
        print $fh $tmp;
        $bytesleft -= $blocksize;
    }

    close $fh;

    # Ensure we have something sensible for the file mode
    if ( $mode =~ /u=(\w+)/ )
    {
        $mode = $1;
    } else {
        $mode = "rw";
    }

    # Save the file data in $state
    $state->{entries}{$state->{directory}.$data}{modified_filename} = $filename;
    $state->{entries}{$state->{directory}.$data}{modified_mode} = $mode;
    $state->{entries}{$state->{directory}.$data}{modified_hash} = `git-hash-object $filename`;
    $state->{entries}{$state->{directory}.$data}{modified_hash} =~ s/\s.*$//s;

    #$log->debug("req_Modified : file=$data mode=$mode size=$size");
}

# Unchanged filename \n
#     Response expected: no. Tell the server that filename has not been
#     modified in the checked out directory. The filename is a file within the
#     most recent directory sent with Directory; it must not contain `/'.
sub req_Unchanged
{
    my ( $cmd, $data ) = @_;

    $state->{entries}{$state->{directory}.$data}{unchanged} = 1;

    #$log->debug("req_Unchanged : $data");
}

# Argument text \n
#     Response expected: no. Save argument for use in a subsequent command.
#     Arguments accumulate until an argument-using command is given, at which
#     point they are forgotten.
# Argumentx text \n
#     Response expected: no. Append \n followed by text to the current argument
#     being saved.
sub req_Argument
{
    my ( $cmd, $data ) = @_;

    # Argumentx means: append to last Argument (with a newline in front)

    $log->debug("$cmd : $data");

    if ( $cmd eq 'Argumentx') {
        ${$state->{arguments}}[$#{$state->{arguments}}] .= "\n" . $data;
    } else {
        push @{$state->{arguments}}, $data;
    }
}

# expand-modules \n
#     Response expected: yes. Expand the modules which are specified in the
#     arguments. Returns the data in Module-expansion responses. Note that the
#     server can assume that this is checkout or export, not rtag or rdiff; the
#     latter do not access the working directory and thus have no need to
#     expand modules on the client side. Expand may not be the best word for
#     what this request does. It does not necessarily tell you all the files
#     contained in a module, for example. Basically it is a way of telling you
#     which working directories the server needs to know about in order to
#     handle a checkout of the specified modules. For example, suppose that the
#     server has a module defined by
#   aliasmodule -a 1dir
#     That is, one can check out aliasmodule and it will take 1dir in the
#     repository and check it out to 1dir in the working directory. Now suppose
#     the client already has this module checked out and is planning on using
#     the co request to update it. Without using expand-modules, the client
#     would have two bad choices: it could either send information about all
#     working directories under the current directory, which could be
#     unnecessarily slow, or it could be ignorant of the fact that aliasmodule
#     stands for 1dir, and neglect to send information for 1dir, which would
#     lead to incorrect operation. With expand-modules, the client would first
#     ask for the module to be expanded:
sub req_expandmodules
{
    my ( $cmd, $data ) = @_;

    argsplit();

    $log->debug("req_expandmodules : " . ( defined($data) ? $data : "[NULL]" ) );

    unless ( ref $state->{arguments} eq "ARRAY" )
    {
        print "ok\n";
        return;
    }

    foreach my $module ( @{$state->{arguments}} )
    {
        $log->debug("SEND : Module-expansion $module");
        print "Module-expansion $module\n";
    }

    print "ok\n";
    statecleanup();
}

# co \n
#     Response expected: yes. Get files from the repository. This uses any
#     previous Argument, Directory, Entry, or Modified requests, if they have
#     been sent. Arguments to this command are module names; the client cannot
#     know what directories they correspond to except by (1) just sending the
#     co request, and then seeing what directory names the server sends back in
#     its responses, and (2) the expand-modules request.
sub req_co
{
    my ( $cmd, $data ) = @_;

    argsplit("co");

    my $module = $state->{args}[0];
    my $checkout_path = $module;

    # use the user specified directory if we're given it
    $checkout_path = $state->{opt}{d} if ( exists ( $state->{opt}{d} ) );

    $log->debug("req_co : " . ( defined($data) ? $data : "[NULL]" ) );

    $log->info("Checking out module '$module' ($state->{CVSROOT}) to '$checkout_path'");

    $ENV{GIT_DIR} = $state->{CVSROOT} . "/";

    # Grab a handle to the SQLite db and do any necessary updates
    my $updater = GITCVS::updater->new($state->{CVSROOT}, $module, $log);
    $updater->update();

    $checkout_path =~ s|/$||; # get rid of trailing slashes

    # Eclipse seems to need the Clear-sticky command
    # to prepare the 'Entries' file for the new directory.
    print "Clear-sticky $checkout_path/\n";
    print $state->{CVSROOT} . "/$module/\n";
    print "Clear-static-directory $checkout_path/\n";
    print $state->{CVSROOT} . "/$module/\n";
    print "Clear-sticky $checkout_path/\n"; # yes, twice
    print $state->{CVSROOT} . "/$module/\n";
    print "Template $checkout_path/\n";
    print $state->{CVSROOT} . "/$module/\n";
    print "0\n";

    # instruct the client that we're checking out to $checkout_path
    print "E cvs checkout: Updating $checkout_path\n";

    my %seendirs = ();
    my $lastdir ='';

    # recursive
    sub prepdir {
       my ($dir, $repodir, $remotedir, $seendirs) = @_;
       my $parent = dirname($dir);
       $dir       =~ s|/+$||;
       $repodir   =~ s|/+$||;
       $remotedir =~ s|/+$||;
       $parent    =~ s|/+$||;
       $log->debug("announcedir $dir, $repodir, $remotedir" );

       if ($parent eq '.' || $parent eq './') {
           $parent = '';
       }
       # recurse to announce unseen parents first
       if (length($parent) && !exists($seendirs->{$parent})) {
           prepdir($parent, $repodir, $remotedir, $seendirs);
       }
       # Announce that we are going to modify at the parent level
       if ($parent) {
           print "E cvs checkout: Updating $remotedir/$parent\n";
       } else {
           print "E cvs checkout: Updating $remotedir\n";
       }
       print "Clear-sticky $remotedir/$parent/\n";
       print "$repodir/$parent/\n";

       print "Clear-static-directory $remotedir/$dir/\n";
       print "$repodir/$dir/\n";
       print "Clear-sticky $remotedir/$parent/\n"; # yes, twice
       print "$repodir/$parent/\n";
       print "Template $remotedir/$dir/\n";
       print "$repodir/$dir/\n";
       print "0\n";

       $seendirs->{$dir} = 1;
    }

    foreach my $git ( @{$updater->gethead} )
    {
        # Don't want to check out deleted files
        next if ( $git->{filehash} eq "deleted" );

        ( $git->{name}, $git->{dir} ) = filenamesplit($git->{name});

       if (length($git->{dir}) && $git->{dir} ne './'
           && $git->{dir} ne $lastdir ) {
           unless (exists($seendirs{$git->{dir}})) {
               prepdir($git->{dir}, $state->{CVSROOT} . "/$module/",
                       $checkout_path, \%seendirs);
               $lastdir = $git->{dir};
               $seendirs{$git->{dir}} = 1;
           }
           print "E cvs checkout: Updating /$checkout_path/$git->{dir}\n";
       }

        # modification time of this file
        print "Mod-time $git->{modified}\n";

        # print some information to the client
        if ( defined ( $git->{dir} ) and $git->{dir} ne "./" )
        {
            print "M U $checkout_path/$git->{dir}$git->{name}\n";
        } else {
            print "M U $checkout_path/$git->{name}\n";
        }

       # instruct client we're sending a file to put in this path
       print "Created $checkout_path/" . ( defined ( $git->{dir} ) and $git->{dir} ne "./" ? $git->{dir} . "/" : "" ) . "\n";

       print $state->{CVSROOT} . "/$module/" . ( defined ( $git->{dir} ) and $git->{dir} ne "./" ? $git->{dir} . "/" : "" ) . "$git->{name}\n";

        # this is an "entries" line
        print "/$git->{name}/1.$git->{revision}///\n";
        # permissions
        print "u=$git->{mode},g=$git->{mode},o=$git->{mode}\n";

        # transmit file
        transmitfile($git->{filehash});
    }

    print "ok\n";

    statecleanup();
}

# update \n
#     Response expected: yes. Actually do a cvs update command. This uses any
#     previous Argument, Directory, Entry, or Modified requests, if they have
#     been sent. The last Directory sent specifies the working directory at the
#     time of the operation. The -I option is not used--files which the client
#     can decide whether to ignore are not mentioned and the client sends the
#     Questionable request for others.
sub req_update
{
    my ( $cmd, $data ) = @_;

    $log->debug("req_update : " . ( defined($data) ? $data : "[NULL]" ));

    argsplit("update");

    #
    # It may just be a client exploring the available heads/modules
    # in that case, list them as top level directories and leave it
    # at that. Eclipse uses this technique to offer you a list of
    # projects (heads in this case) to checkout.
    #
    if ($state->{module} eq '') {
        print "E cvs update: Updating .\n";
	opendir HEADS, $state->{CVSROOT} . '/refs/heads';
	while (my $head = readdir(HEADS)) {
	    if (-f $state->{CVSROOT} . '/refs/heads/' . $head) {
	        print "E cvs update: New directory `$head'\n";
	    }
	}
	closedir HEADS;
	print "ok\n";
	return 1;
    }


    # Grab a handle to the SQLite db and do any necessary updates
    my $updater = GITCVS::updater->new($state->{CVSROOT}, $state->{module}, $log);

    $updater->update();

    argsfromdir($updater);

    #$log->debug("update state : " . Dumper($state));

    # foreach file specified on the command line ...
    foreach my $filename ( @{$state->{args}} )
    {
        $filename = filecleanup($filename);

        $log->debug("Processing file $filename");

        # if we have a -C we should pretend we never saw modified stuff
        if ( exists ( $state->{opt}{C} ) )
        {
            delete $state->{entries}{$filename}{modified_hash};
            delete $state->{entries}{$filename}{modified_filename};
            $state->{entries}{$filename}{unchanged} = 1;
        }

        my $meta;
        if ( defined($state->{opt}{r}) and $state->{opt}{r} =~ /^1\.(\d+)/ )
        {
            $meta = $updater->getmeta($filename, $1);
        } else {
            $meta = $updater->getmeta($filename);
        }

	if ( ! defined $meta )
	{
	    $meta = {
	        name => $filename,
	        revision => 0,
	        filehash => 'added'
	    };
	}

        my $oldmeta = $meta;

        my $wrev = revparse($filename);

        # If the working copy is an old revision, lets get that version too for comparison.
        if ( defined($wrev) and $wrev != $meta->{revision} )
        {
            $oldmeta = $updater->getmeta($filename, $wrev);
        }

        #$log->debug("Target revision is $meta->{revision}, current working revision is $wrev");

        # Files are up to date if the working copy and repo copy have the same revision,
        # and the working copy is unmodified _and_ the user hasn't specified -C
        next if ( defined ( $wrev )
                  and defined($meta->{revision})
                  and $wrev == $meta->{revision}
                  and $state->{entries}{$filename}{unchanged}
                  and not exists ( $state->{opt}{C} ) );

        # If the working copy and repo copy have the same revision,
        # but the working copy is modified, tell the client it's modified
        if ( defined ( $wrev )
             and defined($meta->{revision})
             and $wrev == $meta->{revision}
             and not exists ( $state->{opt}{C} ) )
        {
            $log->info("Tell the client the file is modified");
            print "MT text M \n";
            print "MT fname $filename\n";
            print "MT newline\n";
            next;
        }

        if ( $meta->{filehash} eq "deleted" )
        {
            my ( $filepart, $dirpart ) = filenamesplit($filename,1);

            $log->info("Removing '$filename' from working copy (no longer in the repo)");

            print "E cvs update: `$filename' is no longer in the repository\n";
            # Don't want to actually _DO_ the update if -n specified
            unless ( $state->{globaloptions}{-n} ) {
		print "Removed $dirpart\n";
		print "$filepart\n";
	    }
        }
        elsif ( not defined ( $state->{entries}{$filename}{modified_hash} )
		or $state->{entries}{$filename}{modified_hash} eq $oldmeta->{filehash}
		or $meta->{filehash} eq 'added' )
        {
            # normal update, just send the new revision (either U=Update,
            # or A=Add, or R=Remove)
	    if ( defined($wrev) && $wrev < 0 )
	    {
	        $log->info("Tell the client the file is scheduled for removal");
		print "MT text R \n";
                print "MT fname $filename\n";
                print "MT newline\n";
		next;
	    }
	    elsif ( !defined($wrev) || $wrev == 0 )
	    {
	        $log->info("Tell the client the file will be added");
		print "MT text A \n";
                print "MT fname $filename\n";
                print "MT newline\n";
		next;

	    }
	    else {
                $log->info("Updating '$filename' $wrev");
                print "MT +updated\n";
                print "MT text U \n";
                print "MT fname $filename\n";
                print "MT newline\n";
		print "MT -updated\n";
	    }

            my ( $filepart, $dirpart ) = filenamesplit($filename,1);

	    # Don't want to actually _DO_ the update if -n specified
	    unless ( $state->{globaloptions}{-n} )
	    {
		if ( defined ( $wrev ) )
		{
		    # instruct client we're sending a file to put in this path as a replacement
		    print "Update-existing $dirpart\n";
		    $log->debug("Updating existing file 'Update-existing $dirpart'");
		} else {
		    # instruct client we're sending a file to put in this path as a new file
		    print "Clear-static-directory $dirpart\n";
		    print $state->{CVSROOT} . "/$state->{module}/$dirpart\n";
		    print "Clear-sticky $dirpart\n";
		    print $state->{CVSROOT} . "/$state->{module}/$dirpart\n";

		    $log->debug("Creating new file 'Created $dirpart'");
		    print "Created $dirpart\n";
		}
		print $state->{CVSROOT} . "/$state->{module}/$filename\n";

		# this is an "entries" line
		$log->debug("/$filepart/1.$meta->{revision}///");
		print "/$filepart/1.$meta->{revision}///\n";

		# permissions
		$log->debug("SEND : u=$meta->{mode},g=$meta->{mode},o=$meta->{mode}");
		print "u=$meta->{mode},g=$meta->{mode},o=$meta->{mode}\n";

		# transmit file
		transmitfile($meta->{filehash});
	    }
        } else {
            $log->info("Updating '$filename'");
            my ( $filepart, $dirpart ) = filenamesplit($meta->{name},1);

            my $dir = tempdir( DIR => $TEMP_DIR, CLEANUP => 1 ) . "/";

            chdir $dir;
            my $file_local = $filepart . ".mine";
            system("ln","-s",$state->{entries}{$filename}{modified_filename}, $file_local);
            my $file_old = $filepart . "." . $oldmeta->{revision};
            transmitfile($oldmeta->{filehash}, $file_old);
            my $file_new = $filepart . "." . $meta->{revision};
            transmitfile($meta->{filehash}, $file_new);

            # we need to merge with the local changes ( M=successful merge, C=conflict merge )
            $log->info("Merging $file_local, $file_old, $file_new");

            $log->debug("Temporary directory for merge is $dir");

            my $return = system("git", "merge-file", $file_local, $file_old, $file_new);
            $return >>= 8;

            if ( $return == 0 )
            {
                $log->info("Merged successfully");
                print "M M $filename\n";
                $log->debug("Update-existing $dirpart");

                # Don't want to actually _DO_ the update if -n specified
                unless ( $state->{globaloptions}{-n} )
                {
                    print "Update-existing $dirpart\n";
                    $log->debug($state->{CVSROOT} . "/$state->{module}/$filename");
                    print $state->{CVSROOT} . "/$state->{module}/$filename\n";
                    $log->debug("/$filepart/1.$meta->{revision}///");
                    print "/$filepart/1.$meta->{revision}///\n";
                }
            }
            elsif ( $return == 1 )
            {
                $log->info("Merged with conflicts");
                print "M C $filename\n";

                # Don't want to actually _DO_ the update if -n specified
                unless ( $state->{globaloptions}{-n} )
                {
                    print "Update-existing $dirpart\n";
                    print $state->{CVSROOT} . "/$state->{module}/$filename\n";
                    print "/$filepart/1.$meta->{revision}/+//\n";
                }
            }
            else
            {
                $log->warn("Merge failed");
                next;
            }

            # Don't want to actually _DO_ the update if -n specified
            unless ( $state->{globaloptions}{-n} )
            {
                # permissions
                $log->debug("SEND : u=$meta->{mode},g=$meta->{mode},o=$meta->{mode}");
                print "u=$meta->{mode},g=$meta->{mode},o=$meta->{mode}\n";

                # transmit file, format is single integer on a line by itself (file
                # size) followed by the file contents
                # TODO : we should copy files in blocks
                my $data = `cat $file_local`;
                $log->debug("File size : " . length($data));
                print length($data) . "\n";
                print $data;
            }

            chdir "/";
        }

    }

    print "ok\n";
}

sub req_ci
{
    my ( $cmd, $data ) = @_;

    argsplit("ci");

    #$log->debug("State : " . Dumper($state));

    $log->info("req_ci : " . ( defined($data) ? $data : "[NULL]" ));

    if ( @ARGV && $ARGV[0] eq 'pserver')
    {
        print "error 1 pserver access cannot commit\n";
        exit;
    }

    if ( -e $state->{CVSROOT} . "/index" )
    {
        $log->warn("file 'index' already exists in the git repository");
        print "error 1 Index already exists in git repo\n";
        exit;
    }

    my $lockfile = "$state->{CVSROOT}/refs/heads/$state->{module}.lock";
    unless ( sysopen(LOCKFILE,$lockfile,O_EXCL|O_CREAT|O_WRONLY) )
    {
        $log->warn("lockfile '$lockfile' already exists, please try again");
        print "error 1 Lock file '$lockfile' already exists, please try again\n";
        exit;
    }

    # Grab a handle to the SQLite db and do any necessary updates
    my $updater = GITCVS::updater->new($state->{CVSROOT}, $state->{module}, $log);
    $updater->update();

    my $tmpdir = tempdir ( DIR => $TEMP_DIR );
    my ( undef, $file_index ) = tempfile ( DIR => $TEMP_DIR, OPEN => 0 );
    $log->info("Lock successful, basing commit on '$tmpdir', index file is '$file_index'");

    $ENV{GIT_DIR} = $state->{CVSROOT} . "/";
    $ENV{GIT_INDEX_FILE} = $file_index;

    chdir $tmpdir;

    # populate the temporary index based
    system("git-read-tree", $state->{module});
    unless ($? == 0)
    {
	die "Error running git-read-tree $state->{module} $file_index $!";
    }
    $log->info("Created index '$file_index' with for head $state->{module} - exit status $?");


    my @committedfiles = ();

    # foreach file specified on the command line ...
    foreach my $filename ( @{$state->{args}} )
    {
        my $committedfile = $filename;
        $filename = filecleanup($filename);

        next unless ( exists $state->{entries}{$filename}{modified_filename} or not $state->{entries}{$filename}{unchanged} );

        my $meta = $updater->getmeta($filename);

        my $wrev = revparse($filename);

        my ( $filepart, $dirpart ) = filenamesplit($filename);

        # do a checkout of the file if it part of this tree
        if ($wrev) {
            system('git-checkout-index', '-f', '-u', $filename);
            unless ($? == 0) {
                die "Error running git-checkout-index -f -u $filename : $!";
            }
        }

        my $addflag = 0;
        my $rmflag = 0;
        $rmflag = 1 if ( defined($wrev) and $wrev < 0 );
        $addflag = 1 unless ( -e $filename );

        # Do up to date checking
        unless ( $addflag or $wrev == $meta->{revision} or ( $rmflag and -$wrev == $meta->{revision} ) )
        {
            # fail everything if an up to date check fails
            print "error 1 Up to date check failed for $filename\n";
            close LOCKFILE;
            unlink($lockfile);
            chdir "/";
            exit;
        }

        push @committedfiles, $committedfile;
        $log->info("Committing $filename");

        system("mkdir","-p",$dirpart) unless ( -d $dirpart );

        unless ( $rmflag )
        {
            $log->debug("rename $state->{entries}{$filename}{modified_filename} $filename");
            rename $state->{entries}{$filename}{modified_filename},$filename;

            # Calculate modes to remove
            my $invmode = "";
            foreach ( qw (r w x) ) { $invmode .= $_ unless ( $state->{entries}{$filename}{modified_mode} =~ /$_/ ); }

            $log->debug("chmod u+" . $state->{entries}{$filename}{modified_mode} . "-" . $invmode . " $filename");
            system("chmod","u+" .  $state->{entries}{$filename}{modified_mode} . "-" . $invmode, $filename);
        }

        if ( $rmflag )
        {
            $log->info("Removing file '$filename'");
            unlink($filename);
            system("git-update-index", "--remove", $filename);
        }
        elsif ( $addflag )
        {
            $log->info("Adding file '$filename'");
            system("git-update-index", "--add", $filename);
        } else {
            $log->info("Updating file '$filename'");
            system("git-update-index", $filename);
        }
    }

    unless ( scalar(@committedfiles) > 0 )
    {
        print "E No files to commit\n";
        print "ok\n";
        close LOCKFILE;
        unlink($lockfile);
        chdir "/";
        return;
    }

    my $treehash = `git-write-tree`;
    my $parenthash = `cat $ENV{GIT_DIR}refs/heads/$state->{module}`;
    chomp $treehash;
    chomp $parenthash;

    $log->debug("Treehash : $treehash, Parenthash : $parenthash");

    # write our commit message out if we have one ...
    my ( $msg_fh, $msg_filename ) = tempfile( DIR => $TEMP_DIR );
    print $msg_fh $state->{opt}{m};# if ( exists ( $state->{opt}{m} ) );
    print $msg_fh "\n\nvia git-CVS emulator\n";
    close $msg_fh;

    my $commithash = `git-commit-tree $treehash -p $parenthash < $msg_filename`;
    $log->info("Commit hash : $commithash");

    unless ( $commithash =~ /[a-zA-Z0-9]{40}/ )
    {
        $log->warn("Commit failed (Invalid commit hash)");
        print "error 1 Commit failed (unknown reason)\n";
        close LOCKFILE;
        unlink($lockfile);
        chdir "/";
        exit;
    }

    print LOCKFILE $commithash;

    $updater->update();

    # foreach file specified on the command line ...
    foreach my $filename ( @committedfiles )
    {
        $filename = filecleanup($filename);

        my $meta = $updater->getmeta($filename);
	unless (defined $meta->{revision}) {
	  $meta->{revision} = 1;
	}

        my ( $filepart, $dirpart ) = filenamesplit($filename, 1);

        $log->debug("Checked-in $dirpart : $filename");

        if ( defined $meta->{filehash} && $meta->{filehash} eq "deleted" )
        {
            print "Remove-entry $dirpart\n";
            print "$filename\n";
        } else {
            print "Checked-in $dirpart\n";
            print "$filename\n";
            print "/$filepart/1.$meta->{revision}///\n";
        }
    }

    close LOCKFILE;
    my $reffile = "$ENV{GIT_DIR}refs/heads/$state->{module}";
    unlink($reffile);
    rename($lockfile, $reffile);
    chdir "/";

    print "ok\n";
}

sub req_status
{
    my ( $cmd, $data ) = @_;

    argsplit("status");

    $log->info("req_status : " . ( defined($data) ? $data : "[NULL]" ));
    #$log->debug("status state : " . Dumper($state));

    # Grab a handle to the SQLite db and do any necessary updates
    my $updater = GITCVS::updater->new($state->{CVSROOT}, $state->{module}, $log);
    $updater->update();

    # if no files were specified, we need to work out what files we should be providing status on ...
    argsfromdir($updater);

    # foreach file specified on the command line ...
    foreach my $filename ( @{$state->{args}} )
    {
        $filename = filecleanup($filename);

        my $meta = $updater->getmeta($filename);
        my $oldmeta = $meta;

        my $wrev = revparse($filename);

        # If the working copy is an old revision, lets get that version too for comparison.
        if ( defined($wrev) and $wrev != $meta->{revision} )
        {
            $oldmeta = $updater->getmeta($filename, $wrev);
        }

        # TODO : All possible statuses aren't yet implemented
        my $status;
        # Files are up to date if the working copy and repo copy have the same revision, and the working copy is unmodified
        $status = "Up-to-date" if ( defined ( $wrev ) and defined($meta->{revision}) and $wrev == $meta->{revision}
                                    and
                                    ( ( $state->{entries}{$filename}{unchanged} and ( not defined ( $state->{entries}{$filename}{conflict} ) or $state->{entries}{$filename}{conflict} !~ /^\+=/ ) )
                                      or ( defined($state->{entries}{$filename}{modified_hash}) and $state->{entries}{$filename}{modified_hash} eq $meta->{filehash} ) )
                                   );

        # Need checkout if the working copy has an older revision than the repo copy, and the working copy is unmodified
        $status ||= "Needs Checkout" if ( defined ( $wrev ) and defined ( $meta->{revision} ) and $meta->{revision} > $wrev
                                          and
                                          ( $state->{entries}{$filename}{unchanged}
                                            or ( defined($state->{entries}{$filename}{modified_hash}) and $state->{entries}{$filename}{modified_hash} eq $oldmeta->{filehash} ) )
                                        );

        # Need checkout if it exists in the repo but doesn't have a working copy
        $status ||= "Needs Checkout" if ( not defined ( $wrev ) and defined ( $meta->{revision} ) );

        # Locally modified if working copy and repo copy have the same revision but there are local changes
        $status ||= "Locally Modified" if ( defined ( $wrev ) and defined($meta->{revision}) and $wrev == $meta->{revision} and $state->{entries}{$filename}{modified_filename} );

        # Needs Merge if working copy revision is less than repo copy and there are local changes
        $status ||= "Needs Merge" if ( defined ( $wrev ) and defined ( $meta->{revision} ) and $meta->{revision} > $wrev and $state->{entries}{$filename}{modified_filename} );

        $status ||= "Locally Added" if ( defined ( $state->{entries}{$filename}{revision} ) and not defined ( $meta->{revision} ) );
        $status ||= "Locally Removed" if ( defined ( $wrev ) and defined ( $meta->{revision} ) and -$wrev == $meta->{revision} );
        $status ||= "Unresolved Conflict" if ( defined ( $state->{entries}{$filename}{conflict} ) and $state->{entries}{$filename}{conflict} =~ /^\+=/ );
        $status ||= "File had conflicts on merge" if ( 0 );

        $status ||= "Unknown";

        print "M ===================================================================\n";
        print "M File: $filename\tStatus: $status\n";
        if ( defined($state->{entries}{$filename}{revision}) )
        {
            print "M Working revision:\t" . $state->{entries}{$filename}{revision} . "\n";
        } else {
            print "M Working revision:\tNo entry for $filename\n";
        }
        if ( defined($meta->{revision}) )
        {
            print "M Repository revision:\t1." . $meta->{revision} . "\t$state->{repository}/$filename,v\n";
            print "M Sticky Tag:\t\t(none)\n";
            print "M Sticky Date:\t\t(none)\n";
            print "M Sticky Options:\t\t(none)\n";
        } else {
            print "M Repository revision:\tNo revision control file\n";
        }
        print "M\n";
    }

    print "ok\n";
}

sub req_diff
{
    my ( $cmd, $data ) = @_;

    argsplit("diff");

    $log->debug("req_diff : " . ( defined($data) ? $data : "[NULL]" ));
    #$log->debug("status state : " . Dumper($state));

    my ($revision1, $revision2);
    if ( defined ( $state->{opt}{r} ) and ref $state->{opt}{r} eq "ARRAY" )
    {
        $revision1 = $state->{opt}{r}[0];
        $revision2 = $state->{opt}{r}[1];
    } else {
        $revision1 = $state->{opt}{r};
    }

    $revision1 =~ s/^1\.// if ( defined ( $revision1 ) );
    $revision2 =~ s/^1\.// if ( defined ( $revision2 ) );

    $log->debug("Diffing revisions " . ( defined($revision1) ? $revision1 : "[NULL]" ) . " and " . ( defined($revision2) ? $revision2 : "[NULL]" ) );

    # Grab a handle to the SQLite db and do any necessary updates
    my $updater = GITCVS::updater->new($state->{CVSROOT}, $state->{module}, $log);
    $updater->update();

    # if no files were specified, we need to work out what files we should be providing status on ...
    argsfromdir($updater);

    # foreach file specified on the command line ...
    foreach my $filename ( @{$state->{args}} )
    {
        $filename = filecleanup($filename);

        my ( $fh, $file1, $file2, $meta1, $meta2, $filediff );

        my $wrev = revparse($filename);

        # We need _something_ to diff against
        next unless ( defined ( $wrev ) );

        # if we have a -r switch, use it
        if ( defined ( $revision1 ) )
        {
            ( undef, $file1 ) = tempfile( DIR => $TEMP_DIR, OPEN => 0 );
            $meta1 = $updater->getmeta($filename, $revision1);
            unless ( defined ( $meta1 ) and $meta1->{filehash} ne "deleted" )
            {
                print "E File $filename at revision 1.$revision1 doesn't exist\n";
                next;
            }
            transmitfile($meta1->{filehash}, $file1);
        }
        # otherwise we just use the working copy revision
        else
        {
            ( undef, $file1 ) = tempfile( DIR => $TEMP_DIR, OPEN => 0 );
            $meta1 = $updater->getmeta($filename, $wrev);
            transmitfile($meta1->{filehash}, $file1);
        }

        # if we have a second -r switch, use it too
        if ( defined ( $revision2 ) )
        {
            ( undef, $file2 ) = tempfile( DIR => $TEMP_DIR, OPEN => 0 );
            $meta2 = $updater->getmeta($filename, $revision2);

            unless ( defined ( $meta2 ) and $meta2->{filehash} ne "deleted" )
            {
                print "E File $filename at revision 1.$revision2 doesn't exist\n";
                next;
            }

            transmitfile($meta2->{filehash}, $file2);
        }
        # otherwise we just use the working copy
        else
        {
            $file2 = $state->{entries}{$filename}{modified_filename};
        }

        # if we have been given -r, and we don't have a $file2 yet, lets get one
        if ( defined ( $revision1 ) and not defined ( $file2 ) )
        {
            ( undef, $file2 ) = tempfile( DIR => $TEMP_DIR, OPEN => 0 );
            $meta2 = $updater->getmeta($filename, $wrev);
            transmitfile($meta2->{filehash}, $file2);
        }

        # We need to have retrieved something useful
        next unless ( defined ( $meta1 ) );

        # Files to date if the working copy and repo copy have the same revision, and the working copy is unmodified
        next if ( not defined ( $meta2 ) and $wrev == $meta1->{revision}
                  and
                   ( ( $state->{entries}{$filename}{unchanged} and ( not defined ( $state->{entries}{$filename}{conflict} ) or $state->{entries}{$filename}{conflict} !~ /^\+=/ ) )
                     or ( defined($state->{entries}{$filename}{modified_hash}) and $state->{entries}{$filename}{modified_hash} eq $meta1->{filehash} ) )
                  );

        # Apparently we only show diffs for locally modified files
        next unless ( defined($meta2) or defined ( $state->{entries}{$filename}{modified_filename} ) );

        print "M Index: $filename\n";
        print "M ===================================================================\n";
        print "M RCS file: $state->{CVSROOT}/$state->{module}/$filename,v\n";
        print "M retrieving revision 1.$meta1->{revision}\n" if ( defined ( $meta1 ) );
        print "M retrieving revision 1.$meta2->{revision}\n" if ( defined ( $meta2 ) );
        print "M diff ";
        foreach my $opt ( keys %{$state->{opt}} )
        {
            if ( ref $state->{opt}{$opt} eq "ARRAY" )
            {
                foreach my $value ( @{$state->{opt}{$opt}} )
                {
                    print "-$opt $value ";
                }
            } else {
                print "-$opt ";
                print "$state->{opt}{$opt} " if ( defined ( $state->{opt}{$opt} ) );
            }
        }
        print "$filename\n";

        $log->info("Diffing $filename -r $meta1->{revision} -r " . ( $meta2->{revision} or "workingcopy" ));

        ( $fh, $filediff ) = tempfile ( DIR => $TEMP_DIR );

        if ( exists $state->{opt}{u} )
        {
            system("diff -u -L '$filename revision 1.$meta1->{revision}' -L '$filename " . ( defined($meta2->{revision}) ? "revision 1.$meta2->{revision}" : "working copy" ) . "' $file1 $file2 > $filediff");
        } else {
            system("diff $file1 $file2 > $filediff");
        }

        while ( <$fh> )
        {
            print "M $_";
        }
        close $fh;
    }

    print "ok\n";
}

sub req_log
{
    my ( $cmd, $data ) = @_;

    argsplit("log");

    $log->debug("req_log : " . ( defined($data) ? $data : "[NULL]" ));
    #$log->debug("log state : " . Dumper($state));

    my ( $minrev, $maxrev );
    if ( defined ( $state->{opt}{r} ) and $state->{opt}{r} =~ /([\d.]+)?(::?)([\d.]+)?/ )
    {
        my $control = $2;
        $minrev = $1;
        $maxrev = $3;
        $minrev =~ s/^1\.// if ( defined ( $minrev ) );
        $maxrev =~ s/^1\.// if ( defined ( $maxrev ) );
        $minrev++ if ( defined($minrev) and $control eq "::" );
    }

    # Grab a handle to the SQLite db and do any necessary updates
    my $updater = GITCVS::updater->new($state->{CVSROOT}, $state->{module}, $log);
    $updater->update();

    # if no files were specified, we need to work out what files we should be providing status on ...
    argsfromdir($updater);

    # foreach file specified on the command line ...
    foreach my $filename ( @{$state->{args}} )
    {
        $filename = filecleanup($filename);

        my $headmeta = $updater->getmeta($filename);

        my $revisions = $updater->getlog($filename);
        my $totalrevisions = scalar(@$revisions);

        if ( defined ( $minrev ) )
        {
            $log->debug("Removing revisions less than $minrev");
            while ( scalar(@$revisions) > 0 and $revisions->[-1]{revision} < $minrev )
            {
                pop @$revisions;
            }
        }
        if ( defined ( $maxrev ) )
        {
            $log->debug("Removing revisions greater than $maxrev");
            while ( scalar(@$revisions) > 0 and $revisions->[0]{revision} > $maxrev )
            {
                shift @$revisions;
            }
        }

        next unless ( scalar(@$revisions) );

        print "M \n";
        print "M RCS file: $state->{CVSROOT}/$state->{module}/$filename,v\n";
        print "M Working file: $filename\n";
        print "M head: 1.$headmeta->{revision}\n";
        print "M branch:\n";
        print "M locks: strict\n";
        print "M access list:\n";
        print "M symbolic names:\n";
        print "M keyword substitution: kv\n";
        print "M total revisions: $totalrevisions;\tselected revisions: " . scalar(@$revisions) . "\n";
        print "M description:\n";

        foreach my $revision ( @$revisions )
        {
            print "M ----------------------------\n";
            print "M revision 1.$revision->{revision}\n";
            # reformat the date for log output
            $revision->{modified} = sprintf('%04d/%02d/%02d %s', $3, $DATE_LIST->{$2}, $1, $4 ) if ( $revision->{modified} =~ /(\d+)\s+(\w+)\s+(\d+)\s+(\S+)/ and defined($DATE_LIST->{$2}) );
            $revision->{author} =~ s/\s+.*//;
            $revision->{author} =~ s/^(.{8}).*/$1/;
            print "M date: $revision->{modified};  author: $revision->{author};  state: " . ( $revision->{filehash} eq "deleted" ? "dead" : "Exp" ) . ";  lines: +2 -3\n";
            my $commitmessage = $updater->commitmessage($revision->{commithash});
            $commitmessage =~ s/^/M /mg;
            print $commitmessage . "\n";
        }
        print "M =============================================================================\n";
    }

    print "ok\n";
}

sub req_annotate
{
    my ( $cmd, $data ) = @_;

    argsplit("annotate");

    $log->info("req_annotate : " . ( defined($data) ? $data : "[NULL]" ));
    #$log->debug("status state : " . Dumper($state));

    # Grab a handle to the SQLite db and do any necessary updates
    my $updater = GITCVS::updater->new($state->{CVSROOT}, $state->{module}, $log);
    $updater->update();

    # if no files were specified, we need to work out what files we should be providing annotate on ...
    argsfromdir($updater);

    # we'll need a temporary checkout dir
    my $tmpdir = tempdir ( DIR => $TEMP_DIR );
    my ( undef, $file_index ) = tempfile ( DIR => $TEMP_DIR, OPEN => 0 );
    $log->info("Temp checkoutdir creation successful, basing annotate session work on '$tmpdir', index file is '$file_index'");

    $ENV{GIT_DIR} = $state->{CVSROOT} . "/";
    $ENV{GIT_INDEX_FILE} = $file_index;

    chdir $tmpdir;

    # foreach file specified on the command line ...
    foreach my $filename ( @{$state->{args}} )
    {
        $filename = filecleanup($filename);

        my $meta = $updater->getmeta($filename);

        next unless ( $meta->{revision} );

	# get all the commits that this file was in
	# in dense format -- aka skip dead revisions
        my $revisions   = $updater->gethistorydense($filename);
	my $lastseenin  = $revisions->[0][2];

	# populate the temporary index based on the latest commit were we saw
	# the file -- but do it cheaply without checking out any files
	# TODO: if we got a revision from the client, use that instead
	# to look up the commithash in sqlite (still good to default to
	# the current head as we do now)
	system("git-read-tree", $lastseenin);
	unless ($? == 0)
	{
	    die "Error running git-read-tree $lastseenin $file_index $!";
	}
	$log->info("Created index '$file_index' with commit $lastseenin - exit status $?");

        # do a checkout of the file
        system('git-checkout-index', '-f', '-u', $filename);
        unless ($? == 0) {
            die "Error running git-checkout-index -f -u $filename : $!";
        }

        $log->info("Annotate $filename");

        # Prepare a file with the commits from the linearized
        # history that annotate should know about. This prevents
        # git-jsannotate telling us about commits we are hiding
        # from the client.

        open(ANNOTATEHINTS, ">$tmpdir/.annotate_hints") or die "Error opening > $tmpdir/.annotate_hints $!";
        for (my $i=0; $i < @$revisions; $i++)
        {
            print ANNOTATEHINTS $revisions->[$i][2];
            if ($i+1 < @$revisions) { # have we got a parent?
                print ANNOTATEHINTS ' ' . $revisions->[$i+1][2];
            }
            print ANNOTATEHINTS "\n";
        }

        print ANNOTATEHINTS "\n";
        close ANNOTATEHINTS;

        my $annotatecmd = 'git-annotate';
        open(ANNOTATE, "-|", $annotatecmd, '-l', '-S', "$tmpdir/.annotate_hints", $filename)
	    or die "Error invoking $annotatecmd -l -S $tmpdir/.annotate_hints $filename : $!";
        my $metadata = {};
        print "E Annotations for $filename\n";
        print "E ***************\n";
        while ( <ANNOTATE> )
        {
            if (m/^([a-zA-Z0-9]{40})\t\([^\)]*\)(.*)$/i)
            {
                my $commithash = $1;
                my $data = $2;
                unless ( defined ( $metadata->{$commithash} ) )
                {
                    $metadata->{$commithash} = $updater->getmeta($filename, $commithash);
                    $metadata->{$commithash}{author} =~ s/\s+.*//;
                    $metadata->{$commithash}{author} =~ s/^(.{8}).*/$1/;
                    $metadata->{$commithash}{modified} = sprintf("%02d-%s-%02d", $1, $2, $3) if ( $metadata->{$commithash}{modified} =~ /^(\d+)\s(\w+)\s\d\d(\d\d)/ );
                }
                printf("M 1.%-5d      (%-8s %10s): %s\n",
                    $metadata->{$commithash}{revision},
                    $metadata->{$commithash}{author},
                    $metadata->{$commithash}{modified},
                    $data
                );
            } else {
                $log->warn("Error in annotate output! LINE: $_");
                print "E Annotate error \n";
                next;
            }
        }
        close ANNOTATE;
    }

    # done; get out of the tempdir
    chdir "/";

    print "ok\n";

}

# This method takes the state->{arguments} array and produces two new arrays.
# The first is $state->{args} which is everything before the '--' argument, and
# the second is $state->{files} which is everything after it.
sub argsplit
{
    return unless( defined($state->{arguments}) and ref $state->{arguments} eq "ARRAY" );

    my $type = shift;

    $state->{args} = [];
    $state->{files} = [];
    $state->{opt} = {};

    if ( defined($type) )
    {
        my $opt = {};
        $opt = { A => 0, N => 0, P => 0, R => 0, c => 0, f => 0, l => 0, n => 0, p => 0, s => 0, r => 1, D => 1, d => 1, k => 1, j => 1, } if ( $type eq "co" );
        $opt = { v => 0, l => 0, R => 0 } if ( $type eq "status" );
        $opt = { A => 0, P => 0, C => 0, d => 0, f => 0, l => 0, R => 0, p => 0, k => 1, r => 1, D => 1, j => 1, I => 1, W => 1 } if ( $type eq "update" );
        $opt = { l => 0, R => 0, k => 1, D => 1, D => 1, r => 2 } if ( $type eq "diff" );
        $opt = { c => 0, R => 0, l => 0, f => 0, F => 1, m => 1, r => 1 } if ( $type eq "ci" );
        $opt = { k => 1, m => 1 } if ( $type eq "add" );
        $opt = { f => 0, l => 0, R => 0 } if ( $type eq "remove" );
        $opt = { l => 0, b => 0, h => 0, R => 0, t => 0, N => 0, S => 0, r => 1, d => 1, s => 1, w => 1 } if ( $type eq "log" );


        while ( scalar ( @{$state->{arguments}} ) > 0 )
        {
            my $arg = shift @{$state->{arguments}};

            next if ( $arg eq "--" );
            next unless ( $arg =~ /\S/ );

            # if the argument looks like a switch
            if ( $arg =~ /^-(\w)(.*)/ )
            {
                # if it's a switch that takes an argument
                if ( $opt->{$1} )
                {
                    # If this switch has already been provided
                    if ( $opt->{$1} > 1 and exists ( $state->{opt}{$1} ) )
                    {
                        $state->{opt}{$1} = [ $state->{opt}{$1} ];
                        if ( length($2) > 0 )
                        {
                            push @{$state->{opt}{$1}},$2;
                        } else {
                            push @{$state->{opt}{$1}}, shift @{$state->{arguments}};
                        }
                    } else {
                        # if there's extra data in the arg, use that as the argument for the switch
                        if ( length($2) > 0 )
                        {
                            $state->{opt}{$1} = $2;
                        } else {
                            $state->{opt}{$1} = shift @{$state->{arguments}};
                        }
                    }
                } else {
                    $state->{opt}{$1} = undef;
                }
            }
            else
            {
                push @{$state->{args}}, $arg;
            }
        }
    }
    else
    {
        my $mode = 0;

        foreach my $value ( @{$state->{arguments}} )
        {
            if ( $value eq "--" )
            {
                $mode++;
                next;
            }
            push @{$state->{args}}, $value if ( $mode == 0 );
            push @{$state->{files}}, $value if ( $mode == 1 );
        }
    }
}

# This method uses $state->{directory} to populate $state->{args} with a list of filenames
sub argsfromdir
{
    my $updater = shift;

    $state->{args} = [] if ( scalar(@{$state->{args}}) == 1 and $state->{args}[0] eq "." );

    return if ( scalar ( @{$state->{args}} ) > 1 );

    my @gethead = @{$updater->gethead};

    # push added files
    foreach my $file (keys %{$state->{entries}}) {
	if ( exists $state->{entries}{$file}{revision} &&
		$state->{entries}{$file}{revision} == 0 )
	{
	    push @gethead, { name => $file, filehash => 'added' };
	}
    }

    if ( scalar(@{$state->{args}}) == 1 )
    {
        my $arg = $state->{args}[0];
        $arg .= $state->{prependdir} if ( defined ( $state->{prependdir} ) );

        $log->info("Only one arg specified, checking for directory expansion on '$arg'");

        foreach my $file ( @gethead )
        {
            next if ( $file->{filehash} eq "deleted" and not defined ( $state->{entries}{$file->{name}} ) );
            next unless ( $file->{name} =~ /^$arg\// or $file->{name} eq $arg  );
            push @{$state->{args}}, $file->{name};
        }

        shift @{$state->{args}} if ( scalar(@{$state->{args}}) > 1 );
    } else {
        $log->info("Only one arg specified, populating file list automatically");

        $state->{args} = [];

        foreach my $file ( @gethead )
        {
            next if ( $file->{filehash} eq "deleted" and not defined ( $state->{entries}{$file->{name}} ) );
            next unless ( $file->{name} =~ s/^$state->{prependdir}// );
            push @{$state->{args}}, $file->{name};
        }
    }
}

# This method cleans up the $state variable after a command that uses arguments has run
sub statecleanup
{
    $state->{files} = [];
    $state->{args} = [];
    $state->{arguments} = [];
    $state->{entries} = {};
}

sub revparse
{
    my $filename = shift;

    return undef unless ( defined ( $state->{entries}{$filename}{revision} ) );

    return $1 if ( $state->{entries}{$filename}{revision} =~ /^1\.(\d+)/ );
    return -$1 if ( $state->{entries}{$filename}{revision} =~ /^-1\.(\d+)/ );

    return undef;
}

# This method takes a file hash and does a CVS "file transfer" which transmits the
# size of the file, and then the file contents.
# If a second argument $targetfile is given, the file is instead written out to
# a file by the name of $targetfile
sub transmitfile
{
    my $filehash = shift;
    my $targetfile = shift;

    if ( defined ( $filehash ) and $filehash eq "deleted" )
    {
        $log->warn("filehash is 'deleted'");
        return;
    }

    die "Need filehash" unless ( defined ( $filehash ) and $filehash =~ /^[a-zA-Z0-9]{40}$/ );

    my $type = `git-cat-file -t $filehash`;
    chomp $type;

    die ( "Invalid type '$type' (expected 'blob')" ) unless ( defined ( $type ) and $type eq "blob" );

    my $size = `git-cat-file -s $filehash`;
    chomp $size;

    $log->debug("transmitfile($filehash) size=$size, type=$type");

    if ( open my $fh, '-|', "git-cat-file", "blob", $filehash )
    {
        if ( defined ( $targetfile ) )
        {
            open NEWFILE, ">", $targetfile or die("Couldn't open '$targetfile' for writing : $!");
            print NEWFILE $_ while ( <$fh> );
            close NEWFILE;
        } else {
            print "$size\n";
            print while ( <$fh> );
        }
        close $fh or die ("Couldn't close filehandle for transmitfile()");
    } else {
        die("Couldn't execute git-cat-file");
    }
}

# This method takes a file name, and returns ( $dirpart, $filepart ) which
# refers to the directory portion and the file portion of the filename
# respectively
sub filenamesplit
{
    my $filename = shift;
    my $fixforlocaldir = shift;

    my ( $filepart, $dirpart ) = ( $filename, "." );
    ( $filepart, $dirpart ) = ( $2, $1 ) if ( $filename =~ /(.*)\/(.*)/ );
    $dirpart .= "/";

    if ( $fixforlocaldir )
    {
        $dirpart =~ s/^$state->{prependdir}//;
    }

    return ( $filepart, $dirpart );
}

sub filecleanup
{
    my $filename = shift;

    return undef unless(defined($filename));
    if ( $filename =~ /^\// )
    {
        print "E absolute filenames '$filename' not supported by server\n";
        return undef;
    }

    $filename =~ s/^\.\///g;
    $filename = $state->{prependdir} . $filename;
    return $filename;
}

package GITCVS::log;

####
#### Copyright The Open University UK - 2006.
####
#### Authors: Martyn Smith    <martyn@catalyst.net.nz>
####          Martin Langhoff <martin@catalyst.net.nz>
####
####

use strict;
use warnings;

=head1 NAME

GITCVS::log

=head1 DESCRIPTION

This module provides very crude logging with a similar interface to
Log::Log4perl

=head1 METHODS

=cut

=head2 new

Creates a new log object, optionally you can specify a filename here to
indicate the file to log to. If no log file is specified, you can specify one
later with method setfile, or indicate you no longer want logging with method
nofile.

Until one of these methods is called, all log calls will buffer messages ready
to write out.

=cut
sub new
{
    my $class = shift;
    my $filename = shift;

    my $self = {};

    bless $self, $class;

    if ( defined ( $filename ) )
    {
        open $self->{fh}, ">>", $filename or die("Couldn't open '$filename' for writing : $!");
    }

    return $self;
}

=head2 setfile

This methods takes a filename, and attempts to open that file as the log file.
If successful, all buffered data is written out to the file, and any further
logging is written directly to the file.

=cut
sub setfile
{
    my $self = shift;
    my $filename = shift;

    if ( defined ( $filename ) )
    {
        open $self->{fh}, ">>", $filename or die("Couldn't open '$filename' for writing : $!");
    }

    return unless ( defined ( $self->{buffer} ) and ref $self->{buffer} eq "ARRAY" );

    while ( my $line = shift @{$self->{buffer}} )
    {
        print {$self->{fh}} $line;
    }
}

=head2 nofile

This method indicates no logging is going to be used. It flushes any entries in
the internal buffer, and sets a flag to ensure no further data is put there.

=cut
sub nofile
{
    my $self = shift;

    $self->{nolog} = 1;

    return unless ( defined ( $self->{buffer} ) and ref $self->{buffer} eq "ARRAY" );

    $self->{buffer} = [];
}

=head2 _logopen

Internal method. Returns true if the log file is open, false otherwise.

=cut
sub _logopen
{
    my $self = shift;

    return 1 if ( defined ( $self->{fh} ) and ref $self->{fh} eq "GLOB" );
    return 0;
}

=head2 debug info warn fatal

These four methods are wrappers to _log. They provide the actual interface for
logging data.

=cut
sub debug { my $self = shift; $self->_log("debug", @_); }
sub info  { my $self = shift; $self->_log("info" , @_); }
sub warn  { my $self = shift; $self->_log("warn" , @_); }
sub fatal { my $self = shift; $self->_log("fatal", @_); }

=head2 _log

This is an internal method called by the logging functions. It generates a
timestamp and pushes the logged line either to file, or internal buffer.

=cut
sub _log
{
    my $self = shift;
    my $level = shift;

    return if ( $self->{nolog} );

    my @time = localtime;
    my $timestring = sprintf("%4d-%02d-%02d %02d:%02d:%02d : %-5s",
        $time[5] + 1900,
        $time[4] + 1,
        $time[3],
        $time[2],
        $time[1],
        $time[0],
        uc $level,
    );

    if ( $self->_logopen )
    {
        print {$self->{fh}} $timestring . " - " . join(" ",@_) . "\n";
    } else {
        push @{$self->{buffer}}, $timestring . " - " . join(" ",@_) . "\n";
    }
}

=head2 DESTROY

This method simply closes the file handle if one is open

=cut
sub DESTROY
{
    my $self = shift;

    if ( $self->_logopen )
    {
        close $self->{fh};
    }
}

package GITCVS::updater;

####
#### Copyright The Open University UK - 2006.
####
#### Authors: Martyn Smith    <martyn@catalyst.net.nz>
####          Martin Langhoff <martin@catalyst.net.nz>
####
####

use strict;
use warnings;
use DBI;

=head1 METHODS

=cut

=head2 new

=cut
sub new
{
    my $class = shift;
    my $config = shift;
    my $module = shift;
    my $log = shift;

    die "Need to specify a git repository" unless ( defined($config) and -d $config );
    die "Need to specify a module" unless ( defined($module) );

    $class = ref($class) || $class;

    my $self = {};

    bless $self, $class;

    $self->{dbdir} = $config . "/";
    die "Database dir '$self->{dbdir}' isn't a directory" unless ( defined($self->{dbdir}) and -d $self->{dbdir} );

    $self->{module} = $module;
    $self->{file} = $self->{dbdir} . "/gitcvs.$module.sqlite";

    $self->{git_path} = $config . "/";

    $self->{log} = $log;

    die "Git repo '$self->{git_path}' doesn't exist" unless ( -d $self->{git_path} );

    $self->{dbh} = DBI->connect("dbi:SQLite:dbname=" . $self->{file},"","");

    $self->{tables} = {};
    foreach my $table ( $self->{dbh}->tables )
    {
        $table =~ s/^"//;
        $table =~ s/"$//;
        $self->{tables}{$table} = 1;
    }

    # Construct the revision table if required
    unless ( $self->{tables}{revision} )
    {
        $self->{dbh}->do("
            CREATE TABLE revision (
                name       TEXT NOT NULL,
                revision   INTEGER NOT NULL,
                filehash   TEXT NOT NULL,
                commithash TEXT NOT NULL,
                author     TEXT NOT NULL,
                modified   TEXT NOT NULL,
                mode       TEXT NOT NULL
            )
        ");
        $self->{dbh}->do("
            CREATE INDEX revision_ix1
            ON revision (name,revision)
        ");
        $self->{dbh}->do("
            CREATE INDEX revision_ix2
            ON revision (name,commithash)
        ");
    }

    # Construct the head table if required
    unless ( $self->{tables}{head} )
    {
        $self->{dbh}->do("
            CREATE TABLE head (
                name       TEXT NOT NULL,
                revision   INTEGER NOT NULL,
                filehash   TEXT NOT NULL,
                commithash TEXT NOT NULL,
                author     TEXT NOT NULL,
                modified   TEXT NOT NULL,
                mode       TEXT NOT NULL
            )
        ");
        $self->{dbh}->do("
            CREATE INDEX head_ix1
            ON head (name)
        ");
    }

    # Construct the properties table if required
    unless ( $self->{tables}{properties} )
    {
        $self->{dbh}->do("
            CREATE TABLE properties (
                key        TEXT NOT NULL PRIMARY KEY,
                value      TEXT
            )
        ");
    }

    # Construct the commitmsgs table if required
    unless ( $self->{tables}{commitmsgs} )
    {
        $self->{dbh}->do("
            CREATE TABLE commitmsgs (
                key        TEXT NOT NULL PRIMARY KEY,
                value      TEXT
            )
        ");
    }

    return $self;
}

=head2 update

=cut
sub update
{
    my $self = shift;

    # first lets get the commit list
    $ENV{GIT_DIR} = $self->{git_path};

    my $commitsha1 = `git rev-parse $self->{module}`;
    chomp $commitsha1;

    my $commitinfo = `git cat-file commit $self->{module} 2>&1`;
    unless ( $commitinfo =~ /tree\s+[a-zA-Z0-9]{40}/ )
    {
        die("Invalid module '$self->{module}'");
    }


    my $git_log;
    my $lastcommit = $self->_get_prop("last_commit");

    if (defined $lastcommit && $lastcommit eq $commitsha1) { # up-to-date
         return 1;
    }

    # Start exclusive lock here...
    $self->{dbh}->begin_work() or die "Cannot lock database for BEGIN";

    # TODO: log processing is memory bound
    # if we can parse into a 2nd file that is in reverse order
    # we can probably do something really efficient
    my @git_log_params = ('--pretty', '--parents', '--topo-order');

    if (defined $lastcommit) {
        push @git_log_params, "$lastcommit..$self->{module}";
    } else {
        push @git_log_params, $self->{module};
    }
    # git-rev-list is the backend / plumbing version of git-log
    open(GITLOG, '-|', 'git-rev-list', @git_log_params) or die "Cannot call git-rev-list: $!";

    my @commits;

    my %commit = ();

    while ( <GITLOG> )
    {
        chomp;
        if (m/^commit\s+(.*)$/) {
            # on ^commit lines put the just seen commit in the stack
            # and prime things for the next one
            if (keys %commit) {
                my %copy = %commit;
                unshift @commits, \%copy;
                %commit = ();
            }
            my @parents = split(m/\s+/, $1);
            $commit{hash} = shift @parents;
            $commit{parents} = \@parents;
        } elsif (m/^(\w+?):\s+(.*)$/ && !exists($commit{message})) {
            # on rfc822-like lines seen before we see any message,
            # lowercase the entry and put it in the hash as key-value
            $commit{lc($1)} = $2;
        } else {
            # message lines - skip initial empty line
            # and trim whitespace
            if (!exists($commit{message}) && m/^\s*$/) {
                # define it to mark the end of headers
                $commit{message} = '';
                next;
            }
            s/^\s+//; s/\s+$//; # trim ws
            $commit{message} .= $_ . "\n";
        }
    }
    close GITLOG;

    unshift @commits, \%commit if ( keys %commit );

    # Now all the commits are in the @commits bucket
    # ordered by time DESC. for each commit that needs processing,
    # determine whether it's following the last head we've seen or if
    # it's on its own branch, grab a file list, and add whatever's changed
    # NOTE: $lastcommit refers to the last commit from previous run
    #       $lastpicked is the last commit we picked in this run
    my $lastpicked;
    my $head = {};
    if (defined $lastcommit) {
        $lastpicked = $lastcommit;
    }

    my $committotal = scalar(@commits);
    my $commitcount = 0;

    # Load the head table into $head (for cached lookups during the update process)
    foreach my $file ( @{$self->gethead()} )
    {
        $head->{$file->{name}} = $file;
    }

    foreach my $commit ( @commits )
    {
        $self->{log}->debug("GITCVS::updater - Processing commit $commit->{hash} (" . (++$commitcount) . " of $committotal)");
        if (defined $lastpicked)
        {
            if (!in_array($lastpicked, @{$commit->{parents}}))
            {
                # skip, we'll see this delta
                # as part of a merge later
                # warn "skipping off-track  $commit->{hash}\n";
                next;
            } elsif (@{$commit->{parents}} > 1) {
                # it is a merge commit, for each parent that is
                # not $lastpicked, see if we can get a log
                # from the merge-base to that parent to put it
                # in the message as a merge summary.
                my @parents = @{$commit->{parents}};
                foreach my $parent (@parents) {
                    # git-merge-base can potentially (but rarely) throw
                    # several candidate merge bases. let's assume
                    # that the first one is the best one.
                    if ($parent eq $lastpicked) {
                        next;
                    }
                    open my $p, 'git-merge-base '. $lastpicked . ' '
                    . $parent . '|';
                    my @output = (<$p>);
                    close $p;
                    my $base = join('', @output);
                    chomp $base;
                    if ($base) {
                        my @merged;
                        # print "want to log between  $base $parent \n";
                        open(GITLOG, '-|', 'git-log', "$base..$parent")
                        or die "Cannot call git-log: $!";
                        my $mergedhash;
                        while (<GITLOG>) {
                            chomp;
                            if (!defined $mergedhash) {
                                if (m/^commit\s+(.+)$/) {
                                    $mergedhash = $1;
                                } else {
                                    next;
                                }
                            } else {
                                # grab the first line that looks non-rfc822
                                # aka has content after leading space
                                if (m/^\s+(\S.*)$/) {
                                    my $title = $1;
                                    $title = substr($title,0,100); # truncate
                                    unshift @merged, "$mergedhash $title";
                                    undef $mergedhash;
                                }
                            }
                        }
                        close GITLOG;
                        if (@merged) {
                            $commit->{mergemsg} = $commit->{message};
                            $commit->{mergemsg} .= "\nSummary of merged commits:\n\n";
                            foreach my $summary (@merged) {
                                $commit->{mergemsg} .= "\t$summary\n";
                            }
                            $commit->{mergemsg} .= "\n\n";
                            # print "Message for $commit->{hash} \n$commit->{mergemsg}";
                        }
                    }
                }
            }
        }

        # convert the date to CVS-happy format
        $commit->{date} = "$2 $1 $4 $3 $5" if ( $commit->{date} =~ /^\w+\s+(\w+)\s+(\d+)\s+(\d+:\d+:\d+)\s+(\d+)\s+([+-]\d+)$/ );

        if ( defined ( $lastpicked ) )
        {
            my $filepipe = open(FILELIST, '-|', 'git-diff-tree', '-z', '-r', $lastpicked, $commit->{hash}) or die("Cannot call git-diff-tree : $!");
	    local ($/) = "\0";
            while ( <FILELIST> )
            {
		chomp;
                unless ( /^:\d{6}\s+\d{3}(\d)\d{2}\s+[a-zA-Z0-9]{40}\s+([a-zA-Z0-9]{40})\s+(\w)$/o )
                {
                    die("Couldn't process git-diff-tree line : $_");
                }
		my ($mode, $hash, $change) = ($1, $2, $3);
		my $name = <FILELIST>;
		chomp($name);

                # $log->debug("File mode=$mode, hash=$hash, change=$change, name=$name");

                my $git_perms = "";
                $git_perms .= "r" if ( $mode & 4 );
                $git_perms .= "w" if ( $mode & 2 );
                $git_perms .= "x" if ( $mode & 1 );
                $git_perms = "rw" if ( $git_perms eq "" );

                if ( $change eq "D" )
                {
                    #$log->debug("DELETE   $name");
                    $head->{$name} = {
                        name => $name,
                        revision => $head->{$name}{revision} + 1,
                        filehash => "deleted",
                        commithash => $commit->{hash},
                        modified => $commit->{date},
                        author => $commit->{author},
                        mode => $git_perms,
                    };
                    $self->insert_rev($name, $head->{$name}{revision}, $hash, $commit->{hash}, $commit->{date}, $commit->{author}, $git_perms);
                }
                elsif ( $change eq "M" )
                {
                    #$log->debug("MODIFIED $name");
                    $head->{$name} = {
                        name => $name,
                        revision => $head->{$name}{revision} + 1,
                        filehash => $hash,
                        commithash => $commit->{hash},
                        modified => $commit->{date},
                        author => $commit->{author},
                        mode => $git_perms,
                    };
                    $self->insert_rev($name, $head->{$name}{revision}, $hash, $commit->{hash}, $commit->{date}, $commit->{author}, $git_perms);
                }
                elsif ( $change eq "A" )
                {
                    #$log->debug("ADDED    $name");
                    $head->{$name} = {
                        name => $name,
                        revision => 1,
                        filehash => $hash,
                        commithash => $commit->{hash},
                        modified => $commit->{date},
                        author => $commit->{author},
                        mode => $git_perms,
                    };
                    $self->insert_rev($name, $head->{$name}{revision}, $hash, $commit->{hash}, $commit->{date}, $commit->{author}, $git_perms);
                }
                else
                {
                    $log->warn("UNKNOWN FILE CHANGE mode=$mode, hash=$hash, change=$change, name=$name");
                    die;
                }
            }
            close FILELIST;
        } else {
            # this is used to detect files removed from the repo
            my $seen_files = {};

            my $filepipe = open(FILELIST, '-|', 'git-ls-tree', '-z', '-r', $commit->{hash}) or die("Cannot call git-ls-tree : $!");
	    local $/ = "\0";
            while ( <FILELIST> )
            {
		chomp;
                unless ( /^(\d+)\s+(\w+)\s+([a-zA-Z0-9]+)\t(.*)$/o )
                {
                    die("Couldn't process git-ls-tree line : $_");
                }

                my ( $git_perms, $git_type, $git_hash, $git_filename ) = ( $1, $2, $3, $4 );

                $seen_files->{$git_filename} = 1;

                my ( $oldhash, $oldrevision, $oldmode ) = (
                    $head->{$git_filename}{filehash},
                    $head->{$git_filename}{revision},
                    $head->{$git_filename}{mode}
                );

                if ( $git_perms =~ /^\d\d\d(\d)\d\d/o )
                {
                    $git_perms = "";
                    $git_perms .= "r" if ( $1 & 4 );
                    $git_perms .= "w" if ( $1 & 2 );
                    $git_perms .= "x" if ( $1 & 1 );
                } else {
                    $git_perms = "rw";
                }

                # unless the file exists with the same hash, we need to update it ...
                unless ( defined($oldhash) and $oldhash eq $git_hash and defined($oldmode) and $oldmode eq $git_perms )
                {
                    my $newrevision = ( $oldrevision or 0 ) + 1;

                    $head->{$git_filename} = {
                        name => $git_filename,
                        revision => $newrevision,
                        filehash => $git_hash,
                        commithash => $commit->{hash},
                        modified => $commit->{date},
                        author => $commit->{author},
                        mode => $git_perms,
                    };


                    $self->insert_rev($git_filename, $newrevision, $git_hash, $commit->{hash}, $commit->{date}, $commit->{author}, $git_perms);
                }
            }
            close FILELIST;

            # Detect deleted files
            foreach my $file ( keys %$head )
            {
                unless ( exists $seen_files->{$file} or $head->{$file}{filehash} eq "deleted" )
                {
                    $head->{$file}{revision}++;
                    $head->{$file}{filehash} = "deleted";
                    $head->{$file}{commithash} = $commit->{hash};
                    $head->{$file}{modified} = $commit->{date};
                    $head->{$file}{author} = $commit->{author};

                    $self->insert_rev($file, $head->{$file}{revision}, $head->{$file}{filehash}, $commit->{hash}, $commit->{date}, $commit->{author}, $head->{$file}{mode});
                }
            }
            # END : "Detect deleted files"
        }


        if (exists $commit->{mergemsg})
        {
            $self->insert_mergelog($commit->{hash}, $commit->{mergemsg});
        }

        $lastpicked = $commit->{hash};

        $self->_set_prop("last_commit", $commit->{hash});
    }

    $self->delete_head();
    foreach my $file ( keys %$head )
    {
        $self->insert_head(
            $file,
            $head->{$file}{revision},
            $head->{$file}{filehash},
            $head->{$file}{commithash},
            $head->{$file}{modified},
            $head->{$file}{author},
            $head->{$file}{mode},
        );
    }
    # invalidate the gethead cache
    $self->{gethead_cache} = undef;


    # Ending exclusive lock here
    $self->{dbh}->commit() or die "Failed to commit changes to SQLite";
}

sub insert_rev
{
    my $self = shift;
    my $name = shift;
    my $revision = shift;
    my $filehash = shift;
    my $commithash = shift;
    my $modified = shift;
    my $author = shift;
    my $mode = shift;

    my $insert_rev = $self->{dbh}->prepare_cached("INSERT INTO revision (name, revision, filehash, commithash, modified, author, mode) VALUES (?,?,?,?,?,?,?)",{},1);
    $insert_rev->execute($name, $revision, $filehash, $commithash, $modified, $author, $mode);
}

sub insert_mergelog
{
    my $self = shift;
    my $key = shift;
    my $value = shift;

    my $insert_mergelog = $self->{dbh}->prepare_cached("INSERT INTO commitmsgs (key, value) VALUES (?,?)",{},1);
    $insert_mergelog->execute($key, $value);
}

sub delete_head
{
    my $self = shift;

    my $delete_head = $self->{dbh}->prepare_cached("DELETE FROM head",{},1);
    $delete_head->execute();
}

sub insert_head
{
    my $self = shift;
    my $name = shift;
    my $revision = shift;
    my $filehash = shift;
    my $commithash = shift;
    my $modified = shift;
    my $author = shift;
    my $mode = shift;

    my $insert_head = $self->{dbh}->prepare_cached("INSERT INTO head (name, revision, filehash, commithash, modified, author, mode) VALUES (?,?,?,?,?,?,?)",{},1);
    $insert_head->execute($name, $revision, $filehash, $commithash, $modified, $author, $mode);
}

sub _headrev
{
    my $self = shift;
    my $filename = shift;

    my $db_query = $self->{dbh}->prepare_cached("SELECT filehash, revision, mode FROM head WHERE name=?",{},1);
    $db_query->execute($filename);
    my ( $hash, $revision, $mode ) = $db_query->fetchrow_array;

    return ( $hash, $revision, $mode );
}

sub _get_prop
{
    my $self = shift;
    my $key = shift;

    my $db_query = $self->{dbh}->prepare_cached("SELECT value FROM properties WHERE key=?",{},1);
    $db_query->execute($key);
    my ( $value ) = $db_query->fetchrow_array;

    return $value;
}

sub _set_prop
{
    my $self = shift;
    my $key = shift;
    my $value = shift;

    my $db_query = $self->{dbh}->prepare_cached("UPDATE properties SET value=? WHERE key=?",{},1);
    $db_query->execute($value, $key);

    unless ( $db_query->rows )
    {
        $db_query = $self->{dbh}->prepare_cached("INSERT INTO properties (key, value) VALUES (?,?)",{},1);
        $db_query->execute($key, $value);
    }

    return $value;
}

=head2 gethead

=cut

sub gethead
{
    my $self = shift;

    return $self->{gethead_cache} if ( defined ( $self->{gethead_cache} ) );

    my $db_query = $self->{dbh}->prepare_cached("SELECT name, filehash, mode, revision, modified, commithash, author FROM head ORDER BY name ASC",{},1);
    $db_query->execute();

    my $tree = [];
    while ( my $file = $db_query->fetchrow_hashref )
    {
        push @$tree, $file;
    }

    $self->{gethead_cache} = $tree;

    return $tree;
}

=head2 getlog

=cut

sub getlog
{
    my $self = shift;
    my $filename = shift;

    my $db_query = $self->{dbh}->prepare_cached("SELECT name, filehash, author, mode, revision, modified, commithash FROM revision WHERE name=? ORDER BY revision DESC",{},1);
    $db_query->execute($filename);

    my $tree = [];
    while ( my $file = $db_query->fetchrow_hashref )
    {
        push @$tree, $file;
    }

    return $tree;
}

=head2 getmeta

This function takes a filename (with path) argument and returns a hashref of
metadata for that file.

=cut

sub getmeta
{
    my $self = shift;
    my $filename = shift;
    my $revision = shift;

    my $db_query;
    if ( defined($revision) and $revision =~ /^\d+$/ )
    {
        $db_query = $self->{dbh}->prepare_cached("SELECT * FROM revision WHERE name=? AND revision=?",{},1);
        $db_query->execute($filename, $revision);
    }
    elsif ( defined($revision) and $revision =~ /^[a-zA-Z0-9]{40}$/ )
    {
        $db_query = $self->{dbh}->prepare_cached("SELECT * FROM revision WHERE name=? AND commithash=?",{},1);
        $db_query->execute($filename, $revision);
    } else {
        $db_query = $self->{dbh}->prepare_cached("SELECT * FROM head WHERE name=?",{},1);
        $db_query->execute($filename);
    }

    return $db_query->fetchrow_hashref;
}

=head2 commitmessage

this function takes a commithash and returns the commit message for that commit

=cut
sub commitmessage
{
    my $self = shift;
    my $commithash = shift;

    die("Need commithash") unless ( defined($commithash) and $commithash =~ /^[a-zA-Z0-9]{40}$/ );

    my $db_query;
    $db_query = $self->{dbh}->prepare_cached("SELECT value FROM commitmsgs WHERE key=?",{},1);
    $db_query->execute($commithash);

    my ( $message ) = $db_query->fetchrow_array;

    if ( defined ( $message ) )
    {
        $message .= " " if ( $message =~ /\n$/ );
        return $message;
    }

    my @lines = safe_pipe_capture("git-cat-file", "commit", $commithash);
    shift @lines while ( $lines[0] =~ /\S/ );
    $message = join("",@lines);
    $message .= " " if ( $message =~ /\n$/ );
    return $message;
}

=head2 gethistory

This function takes a filename (with path) argument and returns an arrayofarrays
containing revision,filehash,commithash ordered by revision descending

=cut
sub gethistory
{
    my $self = shift;
    my $filename = shift;

    my $db_query;
    $db_query = $self->{dbh}->prepare_cached("SELECT revision, filehash, commithash FROM revision WHERE name=? ORDER BY revision DESC",{},1);
    $db_query->execute($filename);

    return $db_query->fetchall_arrayref;
}

=head2 gethistorydense

This function takes a filename (with path) argument and returns an arrayofarrays
containing revision,filehash,commithash ordered by revision descending.

This version of gethistory skips deleted entries -- so it is useful for annotate.
The 'dense' part is a reference to a '--dense' option available for git-rev-list
and other git tools that depend on it.

=cut
sub gethistorydense
{
    my $self = shift;
    my $filename = shift;

    my $db_query;
    $db_query = $self->{dbh}->prepare_cached("SELECT revision, filehash, commithash FROM revision WHERE name=? AND filehash!='deleted' ORDER BY revision DESC",{},1);
    $db_query->execute($filename);

    return $db_query->fetchall_arrayref;
}

=head2 in_array()

from Array::PAT - mimics the in_array() function
found in PHP. Yuck but works for small arrays.

=cut
sub in_array
{
    my ($check, @array) = @_;
    my $retval = 0;
    foreach my $test (@array){
        if($check eq $test){
            $retval =  1;
        }
    }
    return $retval;
}

=head2 safe_pipe_capture

an alternative to `command` that allows input to be passed as an array
to work around shell problems with weird characters in arguments

=cut
sub safe_pipe_capture {

    my @output;

    if (my $pid = open my $child, '-|') {
        @output = (<$child>);
        close $child or die join(' ',@_).": $! $?";
    } else {
        exec(@_) or die "$! $?"; # exec() can fail the executable can't be found
    }
    return wantarray ? @output : join('',@output);
}


1;