aboutsummaryrefslogtreecommitdiff
path: root/git-mergetool.sh
blob: 3aab5aae844b963fc4178675a56da20e02488dfd (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
#!/bin/sh
#
# This program resolves merge conflicts in git
#
# Copyright (c) 2006 Theodore Y. Ts'o
#
# This file is licensed under the GPL v2, or a later version
# at the discretion of Junio C Hamano.
#

USAGE='[--tool=tool] [-y|--no-prompt|--prompt] [file to merge] ...'
SUBDIRECTORY_OK=Yes
OPTIONS_SPEC=
TOOL_MODE=merge
. git-sh-setup
. git-mergetool--lib
require_work_tree

# Returns true if the mode reflects a symlink
is_symlink () {
    test "$1" = 120000
}

is_submodule () {
    test "$1" = 160000
}

local_present () {
    test -n "$local_mode"
}

remote_present () {
    test -n "$remote_mode"
}

base_present () {
    test -n "$base_mode"
}

cleanup_temp_files () {
    if test "$1" = --save-backup ; then
	rm -rf -- "$MERGED.orig"
	test -e "$BACKUP" && mv -- "$BACKUP" "$MERGED.orig"
	rm -f -- "$LOCAL" "$REMOTE" "$BASE"
    else
	rm -f -- "$LOCAL" "$REMOTE" "$BASE" "$BACKUP"
    fi
}

describe_file () {
    mode="$1"
    branch="$2"
    file="$3"

    printf "  {%s}: " "$branch"
    if test -z "$mode"; then
	echo "deleted"
    elif is_symlink "$mode" ; then
	echo "a symbolic link -> '$(cat "$file")'"
    elif is_submodule "$mode" ; then
	echo "submodule commit $file"
    else
	if base_present; then
	    echo "modified file"
	else
	    echo "created file"
	fi
    fi
}


resolve_symlink_merge () {
    while true; do
	printf "Use (l)ocal or (r)emote, or (a)bort? "
	read ans
	case "$ans" in
	    [lL]*)
		git checkout-index -f --stage=2 -- "$MERGED"
		git add -- "$MERGED"
		cleanup_temp_files --save-backup
		return 0
		;;
	    [rR]*)
		git checkout-index -f --stage=3 -- "$MERGED"
		git add -- "$MERGED"
		cleanup_temp_files --save-backup
		return 0
		;;
	    [aA]*)
		return 1
		;;
	    esac
	done
}

resolve_deleted_merge () {
    while true; do
	if base_present; then
	    printf "Use (m)odified or (d)eleted file, or (a)bort? "
	else
	    printf "Use (c)reated or (d)eleted file, or (a)bort? "
	fi
	read ans
	case "$ans" in
	    [mMcC]*)
		git add -- "$MERGED"
		cleanup_temp_files --save-backup
		return 0
		;;
	    [dD]*)
		git rm -- "$MERGED" > /dev/null
		cleanup_temp_files
		return 0
		;;
	    [aA]*)
		return 1
		;;
	    esac
	done
}

resolve_submodule_merge () {
    while true; do
	printf "Use (l)ocal or (r)emote, or (a)bort? "
	read ans
	case "$ans" in
	    [lL]*)
		if ! local_present; then
		    if test -n "$(git ls-tree HEAD -- "$MERGED")"; then
			# Local isn't present, but it's a subdirectory
			git ls-tree --full-name -r HEAD -- "$MERGED" | git update-index --index-info || exit $?
		    else
			test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
			git update-index --force-remove "$MERGED"
			cleanup_temp_files --save-backup
		    fi
		elif is_submodule "$local_mode"; then
		    stage_submodule "$MERGED" "$local_sha1"
		else
		    git checkout-index -f --stage=2 -- "$MERGED"
		    git add -- "$MERGED"
		fi
		return 0
		;;
	    [rR]*)
		if ! remote_present; then
		    if test -n "$(git ls-tree MERGE_HEAD -- "$MERGED")"; then
			# Remote isn't present, but it's a subdirectory
			git ls-tree --full-name -r MERGE_HEAD -- "$MERGED" | git update-index --index-info || exit $?
		    else
			test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
			git update-index --force-remove "$MERGED"
		    fi
		elif is_submodule "$remote_mode"; then
		    ! is_submodule "$local_mode" && test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
		    stage_submodule "$MERGED" "$remote_sha1"
		else
		    test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
		    git checkout-index -f --stage=3 -- "$MERGED"
		    git add -- "$MERGED"
		fi
		cleanup_temp_files --save-backup
		return 0
		;;
	    [aA]*)
		return 1
		;;
	    esac
	done
}

stage_submodule () {
    path="$1"
    submodule_sha1="$2"
    mkdir -p "$path" || die "fatal: unable to create directory for module at $path"
    # Find $path relative to work tree
    work_tree_root=$(cd_to_toplevel && pwd)
    work_rel_path=$(cd "$path" && GIT_WORK_TREE="${work_tree_root}" git rev-parse --show-prefix)
    test -n "$work_rel_path" || die "fatal: unable to get path of module $path relative to work tree"
    git update-index --add --replace --cacheinfo 160000 "$submodule_sha1" "${work_rel_path%/}" || die
}

checkout_staged_file () {
    tmpfile=$(expr "$(git checkout-index --temp --stage="$1" "$2")" : '\([^	]*\)	')

    if test $? -eq 0 -a -n "$tmpfile" ; then
	mv -- "$(git rev-parse --show-cdup)$tmpfile" "$3"
    fi
}

merge_file () {
    MERGED="$1"

    f=$(git ls-files -u -- "$MERGED")
    if test -z "$f" ; then
	if test ! -f "$MERGED" ; then
	    echo "$MERGED: file not found"
	else
	    echo "$MERGED: file does not need merging"
	fi
	return 1
    fi

    ext="$$$(expr "$MERGED" : '.*\(\.[^/]*\)$')"
    BACKUP="./$MERGED.BACKUP.$ext"
    LOCAL="./$MERGED.LOCAL.$ext"
    REMOTE="./$MERGED.REMOTE.$ext"
    BASE="./$MERGED.BASE.$ext"

    base_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==1) print $1;}')
    local_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==2) print $1;}')
    remote_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==3) print $1;}')

    if is_submodule "$local_mode" || is_submodule "$remote_mode"; then
	echo "Submodule merge conflict for '$MERGED':"
	local_sha1=$(git ls-files -u -- "$MERGED" | awk '{if ($3==2) print $2;}')
	remote_sha1=$(git ls-files -u -- "$MERGED" | awk '{if ($3==3) print $2;}')
	describe_file "$local_mode" "local" "$local_sha1"
	describe_file "$remote_mode" "remote" "$remote_sha1"
	resolve_submodule_merge
	return
    fi

    mv -- "$MERGED" "$BACKUP"
    cp -- "$BACKUP" "$MERGED"

    base_present   && checkout_staged_file 1 "$MERGED" "$BASE"
    local_present  && checkout_staged_file 2 "$MERGED" "$LOCAL"
    remote_present && checkout_staged_file 3 "$MERGED" "$REMOTE"

    if test -z "$local_mode" -o -z "$remote_mode"; then
	echo "Deleted merge conflict for '$MERGED':"
	describe_file "$local_mode" "local" "$LOCAL"
	describe_file "$remote_mode" "remote" "$REMOTE"
	resolve_deleted_merge
	return
    fi

    if is_symlink "$local_mode" || is_symlink "$remote_mode"; then
	echo "Symbolic link merge conflict for '$MERGED':"
	describe_file "$local_mode" "local" "$LOCAL"
	describe_file "$remote_mode" "remote" "$REMOTE"
	resolve_symlink_merge
	return
    fi

    echo "Normal merge conflict for '$MERGED':"
    describe_file "$local_mode" "local" "$LOCAL"
    describe_file "$remote_mode" "remote" "$REMOTE"
    if "$prompt" = true; then
	printf "Hit return to start merge resolution tool (%s): " "$merge_tool"
	read ans
    fi

    if base_present; then
	    present=true
    else
	    present=false
    fi

    if ! run_merge_tool "$merge_tool" "$present"; then
	echo "merge of $MERGED failed" 1>&2
	mv -- "$BACKUP" "$MERGED"

	if test "$merge_keep_temporaries" = "false"; then
	    cleanup_temp_files
	fi

	return 1
    fi

    if test "$merge_keep_backup" = "true"; then
	mv -- "$BACKUP" "$MERGED.orig"
    else
	rm -- "$BACKUP"
    fi

    git add -- "$MERGED"
    cleanup_temp_files
    return 0
}

prompt=$(git config --bool mergetool.prompt || echo true)

while test $# != 0
do
    case "$1" in
	-t|--tool*)
	    case "$#,$1" in
		*,*=*)
		    merge_tool=$(expr "z$1" : 'z-[^=]*=\(.*\)')
		    ;;
		1,*)
		    usage ;;
		*)
		    merge_tool="$2"
		    shift ;;
	    esac
	    ;;
	-y|--no-prompt)
	    prompt=false
	    ;;
	--prompt)
	    prompt=true
	    ;;
	--)
	    shift
	    break
	    ;;
	-*)
	    usage
	    ;;
	*)
	    break
	    ;;
    esac
    shift
done

prompt_after_failed_merge() {
    while true; do
	printf "Continue merging other unresolved paths (y/n) ? "
	read ans
	case "$ans" in

	    [yY]*)
		return 0
		;;

	    [nN]*)
		return 1
		;;
	esac
    done
}

if test -z "$merge_tool"; then
    merge_tool=$(get_merge_tool "$merge_tool") || exit
fi
merge_keep_backup="$(git config --bool mergetool.keepBackup || echo true)"
merge_keep_temporaries="$(git config --bool mergetool.keepTemporaries || echo false)"

last_status=0
rollup_status=0
rerere=false

files_to_merge() {
    if test "$rerere" = true
    then
	git rerere remaining
    else
	git ls-files -u | sed -e 's/^[^	]*	//' | sort -u
    fi
}


if test $# -eq 0 ; then
    cd_to_toplevel

    if test -e "$GIT_DIR/MERGE_RR"
    then
	rerere=true
    fi

    files=$(files_to_merge)
    if test -z "$files" ; then
	echo "No files need merging"
	exit 0
    fi

    # Save original stdin
    exec 3<&0

    printf "Merging:\n"
    printf "$files\n"

    files_to_merge |
    while IFS= read i
    do
	if test $last_status -ne 0; then
	    prompt_after_failed_merge <&3 || exit 1
	fi
	printf "\n"
	merge_file "$i" <&3
	last_status=$?
	if test $last_status -ne 0; then
	    rollup_status=1
	fi
    done
else
    while test $# -gt 0; do
	if test $last_status -ne 0; then
	    prompt_after_failed_merge || exit 1
	fi
	printf "\n"
	merge_file "$1"
	last_status=$?
	if test $last_status -ne 0; then
	    rollup_status=1
	fi
	shift
    done
fi

exit $rollup_status