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
|
#include "cache.h"
#include "blob.h"
static void create_directories(const char *path, const struct checkout *state)
{
int len = strlen(path);
char *buf = xmalloc(len + 1);
const char *slash = path;
while ((slash = strchr(slash+1, '/')) != NULL) {
struct stat st;
int stat_status;
len = slash - path;
memcpy(buf, path, len);
buf[len] = 0;
if (len <= state->base_dir_len)
/*
* checkout-index --prefix=<dir>; <dir> is
* allowed to be a symlink to an existing
* directory.
*/
stat_status = stat(buf, &st);
else
/*
* if there currently is a symlink, we would
* want to replace it with a real directory.
*/
stat_status = lstat(buf, &st);
if (!stat_status && S_ISDIR(st.st_mode))
continue; /* ok, it is already a directory. */
/*
* We know stat_status == 0 means something exists
* there and this mkdir would fail, but that is an
* error codepath; we do not care, as we unlink and
* mkdir again in such a case.
*/
if (mkdir(buf, 0777)) {
if (errno == EEXIST && state->force &&
!unlink(buf) && !mkdir(buf, 0777))
continue;
die("cannot create directory at %s", buf);
}
}
free(buf);
}
static void remove_subtree(const char *path)
{
DIR *dir = opendir(path);
struct dirent *de;
char pathbuf[PATH_MAX];
char *name;
if (!dir)
die("cannot opendir %s (%s)", path, strerror(errno));
strcpy(pathbuf, path);
name = pathbuf + strlen(path);
*name++ = '/';
while ((de = readdir(dir)) != NULL) {
struct stat st;
if ((de->d_name[0] == '.') &&
((de->d_name[1] == 0) ||
((de->d_name[1] == '.') && de->d_name[2] == 0)))
continue;
strcpy(name, de->d_name);
if (lstat(pathbuf, &st))
die("cannot lstat %s (%s)", pathbuf, strerror(errno));
if (S_ISDIR(st.st_mode))
remove_subtree(pathbuf);
else if (unlink(pathbuf))
die("cannot unlink %s (%s)", pathbuf, strerror(errno));
}
closedir(dir);
if (rmdir(path))
die("cannot rmdir %s (%s)", path, strerror(errno));
}
static int create_file(const char *path, unsigned int mode)
{
mode = (mode & 0100) ? 0777 : 0666;
return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
}
static void *read_blob_entry(struct cache_entry *ce, const char *path, unsigned long *size)
{
enum object_type type;
void *new = read_sha1_file(ce->sha1, &type, size);
if (new) {
if (type == OBJ_BLOB)
return new;
free(new);
}
return NULL;
}
static int write_entry(struct cache_entry *ce, char *path, const struct checkout *state, int to_tempfile)
{
int fd;
long wrote;
switch (ce->ce_mode & S_IFMT) {
char *new;
struct strbuf buf;
unsigned long size;
case S_IFREG:
new = read_blob_entry(ce, path, &size);
if (!new)
return error("git checkout-index: unable to read sha1 file of %s (%s)",
path, sha1_to_hex(ce->sha1));
/*
* Convert from git internal format to working tree format
*/
strbuf_init(&buf, 0);
if (convert_to_working_tree(ce->name, new, size, &buf)) {
size_t newsize = 0;
free(new);
new = strbuf_detach(&buf, &newsize);
size = newsize;
}
if (to_tempfile) {
strcpy(path, ".merge_file_XXXXXX");
fd = mkstemp(path);
} else
fd = create_file(path, ce->ce_mode);
if (fd < 0) {
free(new);
return error("git checkout-index: unable to create file %s (%s)",
path, strerror(errno));
}
wrote = write_in_full(fd, new, size);
close(fd);
free(new);
if (wrote != size)
return error("git checkout-index: unable to write file %s", path);
break;
case S_IFLNK:
new = read_blob_entry(ce, path, &size);
if (!new)
return error("git checkout-index: unable to read sha1 file of %s (%s)",
path, sha1_to_hex(ce->sha1));
if (to_tempfile || !has_symlinks) {
if (to_tempfile) {
strcpy(path, ".merge_link_XXXXXX");
fd = mkstemp(path);
} else
fd = create_file(path, 0666);
if (fd < 0) {
free(new);
return error("git checkout-index: unable to create "
"file %s (%s)", path, strerror(errno));
}
wrote = write_in_full(fd, new, size);
close(fd);
free(new);
if (wrote != size)
return error("git checkout-index: unable to write file %s",
path);
} else {
wrote = symlink(new, path);
free(new);
if (wrote)
return error("git checkout-index: unable to create "
"symlink %s (%s)", path, strerror(errno));
}
break;
case S_IFGITLINK:
if (to_tempfile)
return error("git checkout-index: cannot create temporary subproject %s", path);
if (mkdir(path, 0777) < 0)
return error("git checkout-index: cannot create subproject directory %s", path);
break;
default:
return error("git checkout-index: unknown file mode for %s", path);
}
if (state->refresh_cache) {
struct stat st;
lstat(ce->name, &st);
fill_stat_cache_info(ce, &st);
}
return 0;
}
int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath)
{
static char path[PATH_MAX + 1];
struct stat st;
int len = state->base_dir_len;
if (topath)
return write_entry(ce, topath, state, 1);
memcpy(path, state->base_dir, len);
strcpy(path + len, ce->name);
if (!lstat(path, &st)) {
unsigned changed = ce_match_stat(ce, &st, CE_MATCH_IGNORE_VALID);
if (!changed)
return 0;
if (!state->force) {
if (!state->quiet)
fprintf(stderr, "git-checkout-index: %s already exists\n", path);
return -1;
}
/*
* We unlink the old file, to get the new one with the
* right permissions (including umask, which is nasty
* to emulate by hand - much easier to let the system
* just do the right thing)
*/
if (S_ISDIR(st.st_mode)) {
/* If it is a gitlink, leave it alone! */
if (S_ISGITLINK(ce->ce_mode))
return 0;
if (!state->force)
return error("%s is a directory", path);
remove_subtree(path);
} else if (unlink(path))
return error("unable to unlink old '%s' (%s)", path, strerror(errno));
} else if (state->not_new)
return 0;
create_directories(path, state);
return write_entry(ce, path, state, 0);
}
|
