git-mergetool: check return value from read
[git/git.git] / git-mergetool.sh
1 #!/bin/sh
2 #
3 # This program resolves merge conflicts in git
4 #
5 # Copyright (c) 2006 Theodore Y. Ts'o
6 #
7 # This file is licensed under the GPL v2, or a later version
8 # at the discretion of Junio C Hamano.
9 #
10
11 USAGE='[--tool=tool] [-y|--no-prompt|--prompt] [file to merge] ...'
12 SUBDIRECTORY_OK=Yes
13 OPTIONS_SPEC=
14 TOOL_MODE=merge
15 . git-sh-setup
16 . git-mergetool--lib
17 require_work_tree
18
19 # Returns true if the mode reflects a symlink
20 is_symlink () {
21 test "$1" = 120000
22 }
23
24 is_submodule () {
25 test "$1" = 160000
26 }
27
28 local_present () {
29 test -n "$local_mode"
30 }
31
32 remote_present () {
33 test -n "$remote_mode"
34 }
35
36 base_present () {
37 test -n "$base_mode"
38 }
39
40 cleanup_temp_files () {
41 if test "$1" = --save-backup ; then
42 rm -rf -- "$MERGED.orig"
43 test -e "$BACKUP" && mv -- "$BACKUP" "$MERGED.orig"
44 rm -f -- "$LOCAL" "$REMOTE" "$BASE"
45 else
46 rm -f -- "$LOCAL" "$REMOTE" "$BASE" "$BACKUP"
47 fi
48 }
49
50 describe_file () {
51 mode="$1"
52 branch="$2"
53 file="$3"
54
55 printf " {%s}: " "$branch"
56 if test -z "$mode"; then
57 echo "deleted"
58 elif is_symlink "$mode" ; then
59 echo "a symbolic link -> '$(cat "$file")'"
60 elif is_submodule "$mode" ; then
61 echo "submodule commit $file"
62 else
63 if base_present; then
64 echo "modified file"
65 else
66 echo "created file"
67 fi
68 fi
69 }
70
71
72 resolve_symlink_merge () {
73 while true; do
74 printf "Use (l)ocal or (r)emote, or (a)bort? "
75 read ans || return 1
76 case "$ans" in
77 [lL]*)
78 git checkout-index -f --stage=2 -- "$MERGED"
79 git add -- "$MERGED"
80 cleanup_temp_files --save-backup
81 return 0
82 ;;
83 [rR]*)
84 git checkout-index -f --stage=3 -- "$MERGED"
85 git add -- "$MERGED"
86 cleanup_temp_files --save-backup
87 return 0
88 ;;
89 [aA]*)
90 return 1
91 ;;
92 esac
93 done
94 }
95
96 resolve_deleted_merge () {
97 while true; do
98 if base_present; then
99 printf "Use (m)odified or (d)eleted file, or (a)bort? "
100 else
101 printf "Use (c)reated or (d)eleted file, or (a)bort? "
102 fi
103 read ans || return 1
104 case "$ans" in
105 [mMcC]*)
106 git add -- "$MERGED"
107 cleanup_temp_files --save-backup
108 return 0
109 ;;
110 [dD]*)
111 git rm -- "$MERGED" > /dev/null
112 cleanup_temp_files
113 return 0
114 ;;
115 [aA]*)
116 return 1
117 ;;
118 esac
119 done
120 }
121
122 resolve_submodule_merge () {
123 while true; do
124 printf "Use (l)ocal or (r)emote, or (a)bort? "
125 read ans || return 1
126 case "$ans" in
127 [lL]*)
128 if ! local_present; then
129 if test -n "$(git ls-tree HEAD -- "$MERGED")"; then
130 # Local isn't present, but it's a subdirectory
131 git ls-tree --full-name -r HEAD -- "$MERGED" | git update-index --index-info || exit $?
132 else
133 test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
134 git update-index --force-remove "$MERGED"
135 cleanup_temp_files --save-backup
136 fi
137 elif is_submodule "$local_mode"; then
138 stage_submodule "$MERGED" "$local_sha1"
139 else
140 git checkout-index -f --stage=2 -- "$MERGED"
141 git add -- "$MERGED"
142 fi
143 return 0
144 ;;
145 [rR]*)
146 if ! remote_present; then
147 if test -n "$(git ls-tree MERGE_HEAD -- "$MERGED")"; then
148 # Remote isn't present, but it's a subdirectory
149 git ls-tree --full-name -r MERGE_HEAD -- "$MERGED" | git update-index --index-info || exit $?
150 else
151 test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
152 git update-index --force-remove "$MERGED"
153 fi
154 elif is_submodule "$remote_mode"; then
155 ! is_submodule "$local_mode" && test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
156 stage_submodule "$MERGED" "$remote_sha1"
157 else
158 test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
159 git checkout-index -f --stage=3 -- "$MERGED"
160 git add -- "$MERGED"
161 fi
162 cleanup_temp_files --save-backup
163 return 0
164 ;;
165 [aA]*)
166 return 1
167 ;;
168 esac
169 done
170 }
171
172 stage_submodule () {
173 path="$1"
174 submodule_sha1="$2"
175 mkdir -p "$path" || die "fatal: unable to create directory for module at $path"
176 # Find $path relative to work tree
177 work_tree_root=$(cd_to_toplevel && pwd)
178 work_rel_path=$(cd "$path" && GIT_WORK_TREE="${work_tree_root}" git rev-parse --show-prefix)
179 test -n "$work_rel_path" || die "fatal: unable to get path of module $path relative to work tree"
180 git update-index --add --replace --cacheinfo 160000 "$submodule_sha1" "${work_rel_path%/}" || die
181 }
182
183 checkout_staged_file () {
184 tmpfile=$(expr "$(git checkout-index --temp --stage="$1" "$2")" : '\([^ ]*\) ')
185
186 if test $? -eq 0 -a -n "$tmpfile" ; then
187 mv -- "$(git rev-parse --show-cdup)$tmpfile" "$3"
188 fi
189 }
190
191 merge_file () {
192 MERGED="$1"
193
194 f=$(git ls-files -u -- "$MERGED")
195 if test -z "$f" ; then
196 if test ! -f "$MERGED" ; then
197 echo "$MERGED: file not found"
198 else
199 echo "$MERGED: file does not need merging"
200 fi
201 return 1
202 fi
203
204 ext="$$$(expr "$MERGED" : '.*\(\.[^/]*\)$')"
205 BACKUP="./$MERGED.BACKUP.$ext"
206 LOCAL="./$MERGED.LOCAL.$ext"
207 REMOTE="./$MERGED.REMOTE.$ext"
208 BASE="./$MERGED.BASE.$ext"
209
210 base_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==1) print $1;}')
211 local_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==2) print $1;}')
212 remote_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==3) print $1;}')
213
214 if is_submodule "$local_mode" || is_submodule "$remote_mode"; then
215 echo "Submodule merge conflict for '$MERGED':"
216 local_sha1=$(git ls-files -u -- "$MERGED" | awk '{if ($3==2) print $2;}')
217 remote_sha1=$(git ls-files -u -- "$MERGED" | awk '{if ($3==3) print $2;}')
218 describe_file "$local_mode" "local" "$local_sha1"
219 describe_file "$remote_mode" "remote" "$remote_sha1"
220 resolve_submodule_merge
221 return
222 fi
223
224 mv -- "$MERGED" "$BACKUP"
225 cp -- "$BACKUP" "$MERGED"
226
227 base_present && checkout_staged_file 1 "$MERGED" "$BASE"
228 local_present && checkout_staged_file 2 "$MERGED" "$LOCAL"
229 remote_present && checkout_staged_file 3 "$MERGED" "$REMOTE"
230
231 if test -z "$local_mode" -o -z "$remote_mode"; then
232 echo "Deleted merge conflict for '$MERGED':"
233 describe_file "$local_mode" "local" "$LOCAL"
234 describe_file "$remote_mode" "remote" "$REMOTE"
235 resolve_deleted_merge
236 return
237 fi
238
239 if is_symlink "$local_mode" || is_symlink "$remote_mode"; then
240 echo "Symbolic link merge conflict for '$MERGED':"
241 describe_file "$local_mode" "local" "$LOCAL"
242 describe_file "$remote_mode" "remote" "$REMOTE"
243 resolve_symlink_merge
244 return
245 fi
246
247 echo "Normal merge conflict for '$MERGED':"
248 describe_file "$local_mode" "local" "$LOCAL"
249 describe_file "$remote_mode" "remote" "$REMOTE"
250 if "$prompt" = true; then
251 printf "Hit return to start merge resolution tool (%s): " "$merge_tool"
252 read ans || return 1
253 fi
254
255 if base_present; then
256 present=true
257 else
258 present=false
259 fi
260
261 if ! run_merge_tool "$merge_tool" "$present"; then
262 echo "merge of $MERGED failed" 1>&2
263 mv -- "$BACKUP" "$MERGED"
264
265 if test "$merge_keep_temporaries" = "false"; then
266 cleanup_temp_files
267 fi
268
269 return 1
270 fi
271
272 if test "$merge_keep_backup" = "true"; then
273 mv -- "$BACKUP" "$MERGED.orig"
274 else
275 rm -- "$BACKUP"
276 fi
277
278 git add -- "$MERGED"
279 cleanup_temp_files
280 return 0
281 }
282
283 prompt=$(git config --bool mergetool.prompt || echo true)
284
285 while test $# != 0
286 do
287 case "$1" in
288 -t|--tool*)
289 case "$#,$1" in
290 *,*=*)
291 merge_tool=$(expr "z$1" : 'z-[^=]*=\(.*\)')
292 ;;
293 1,*)
294 usage ;;
295 *)
296 merge_tool="$2"
297 shift ;;
298 esac
299 ;;
300 -y|--no-prompt)
301 prompt=false
302 ;;
303 --prompt)
304 prompt=true
305 ;;
306 --)
307 shift
308 break
309 ;;
310 -*)
311 usage
312 ;;
313 *)
314 break
315 ;;
316 esac
317 shift
318 done
319
320 prompt_after_failed_merge() {
321 while true; do
322 printf "Continue merging other unresolved paths (y/n) ? "
323 read ans || return 1
324 case "$ans" in
325
326 [yY]*)
327 return 0
328 ;;
329
330 [nN]*)
331 return 1
332 ;;
333 esac
334 done
335 }
336
337 if test -z "$merge_tool"; then
338 merge_tool=$(get_merge_tool "$merge_tool") || exit
339 fi
340 merge_keep_backup="$(git config --bool mergetool.keepBackup || echo true)"
341 merge_keep_temporaries="$(git config --bool mergetool.keepTemporaries || echo false)"
342
343 last_status=0
344 rollup_status=0
345 rerere=false
346
347 files_to_merge() {
348 if test "$rerere" = true
349 then
350 git rerere remaining
351 else
352 git ls-files -u | sed -e 's/^[^ ]* //' | sort -u
353 fi
354 }
355
356
357 if test $# -eq 0 ; then
358 cd_to_toplevel
359
360 if test -e "$GIT_DIR/MERGE_RR"
361 then
362 rerere=true
363 fi
364
365 files=$(files_to_merge)
366 if test -z "$files" ; then
367 echo "No files need merging"
368 exit 0
369 fi
370
371 # Save original stdin
372 exec 3<&0
373
374 printf "Merging:\n"
375 printf "$files\n"
376
377 files_to_merge |
378 while IFS= read i
379 do
380 if test $last_status -ne 0; then
381 prompt_after_failed_merge <&3 || exit 1
382 fi
383 printf "\n"
384 merge_file "$i" <&3
385 last_status=$?
386 if test $last_status -ne 0; then
387 rollup_status=1
388 fi
389 done
390 else
391 while test $# -gt 0; do
392 if test $last_status -ne 0; then
393 prompt_after_failed_merge || exit 1
394 fi
395 printf "\n"
396 merge_file "$1"
397 last_status=$?
398 if test $last_status -ne 0; then
399 rollup_status=1
400 fi
401 shift
402 done
403 fi
404
405 exit $rollup_status