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#
10USAGE='[--tool=tool] [--tool-help] [-y|--no-prompt|--prompt] [file to merge] ...'
12SUBDIRECTORY_OK=Yes
13NONGIT_OK=Yes
14OPTIONS_SPEC=
15TOOL_MODE=merge
16. git-sh-setup
17. git-mergetool--lib
18# Returns true if the mode reflects a symlink
20is_symlink () {
21 test "$1" = 120000
22}
23is_submodule () {
25 test "$1" = 160000
26}
27local_present () {
29 test -n "$local_mode"
30}
31remote_present () {
33 test -n "$remote_mode"
34}
35base_present () {
37 test -n "$base_mode"
38}
39mergetool_tmpdir_init () {
41 if test "$(git config --bool mergetool.writeToTemp)" != true
42 then
43 MERGETOOL_TMPDIR=.
44 return 0
45 fi
46 if MERGETOOL_TMPDIR=$(mktemp -d -t "git-mergetool-XXXXXX" 2>/dev/null)
47 then
48 return 0
49 fi
50 die "error: mktemp is needed when 'mergetool.writeToTemp' is true"
51}
52cleanup_temp_files () {
54 if test "$1" = --save-backup
55 then
56 rm -rf -- "$MERGED.orig"
57 test -e "$BACKUP" && mv -- "$BACKUP" "$MERGED.orig"
58 rm -f -- "$LOCAL" "$REMOTE" "$BASE"
59 else
60 rm -f -- "$LOCAL" "$REMOTE" "$BASE" "$BACKUP"
61 fi
62 if test "$MERGETOOL_TMPDIR" != "."
63 then
64 rmdir "$MERGETOOL_TMPDIR"
65 fi
66}
67describe_file () {
69 mode="$1"
70 branch="$2"
71 file="$3"
72 printf " {%s}: " "$branch"
74 if test -z "$mode"
75 then
76 echo "deleted"
77 elif is_symlink "$mode"
78 then
79 echo "a symbolic link -> '$(cat "$file")'"
80 elif is_submodule "$mode"
81 then
82 echo "submodule commit $file"
83 elif base_present
84 then
85 echo "modified file"
86 else
87 echo "created file"
88 fi
89}
90resolve_symlink_merge () {
92 while true
93 do
94 printf "Use (l)ocal or (r)emote, or (a)bort? "
95 read ans || return 1
96 case "$ans" in
97 [lL]*)
98 git checkout-index -f --stage=2 -- "$MERGED"
99 git add -- "$MERGED"
100 cleanup_temp_files --save-backup
101 return 0
102 ;;
103 [rR]*)
104 git checkout-index -f --stage=3 -- "$MERGED"
105 git add -- "$MERGED"
106 cleanup_temp_files --save-backup
107 return 0
108 ;;
109 [aA]*)
110 return 1
111 ;;
112 esac
113 done
114}
115resolve_deleted_merge () {
117 while true
118 do
119 if base_present
120 then
121 printf "Use (m)odified or (d)eleted file, or (a)bort? "
122 else
123 printf "Use (c)reated or (d)eleted file, or (a)bort? "
124 fi
125 read ans || return 1
126 case "$ans" in
127 [mMcC]*)
128 git add -- "$MERGED"
129 cleanup_temp_files --save-backup
130 return 0
131 ;;
132 [dD]*)
133 git rm -- "$MERGED" > /dev/null
134 cleanup_temp_files
135 return 0
136 ;;
137 [aA]*)
138 return 1
139 ;;
140 esac
141 done
142}
143resolve_submodule_merge () {
145 while true
146 do
147 printf "Use (l)ocal or (r)emote, or (a)bort? "
148 read ans || return 1
149 case "$ans" in
150 [lL]*)
151 if ! local_present
152 then
153 if test -n "$(git ls-tree HEAD -- "$MERGED")"
154 then
155 # Local isn't present, but it's a subdirectory
156 git ls-tree --full-name -r HEAD -- "$MERGED" |
157 git update-index --index-info || exit $?
158 else
159 test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
160 git update-index --force-remove "$MERGED"
161 cleanup_temp_files --save-backup
162 fi
163 elif is_submodule "$local_mode"
164 then
165 stage_submodule "$MERGED" "$local_sha1"
166 else
167 git checkout-index -f --stage=2 -- "$MERGED"
168 git add -- "$MERGED"
169 fi
170 return 0
171 ;;
172 [rR]*)
173 if ! remote_present
174 then
175 if test -n "$(git ls-tree MERGE_HEAD -- "$MERGED")"
176 then
177 # Remote isn't present, but it's a subdirectory
178 git ls-tree --full-name -r MERGE_HEAD -- "$MERGED" |
179 git update-index --index-info || exit $?
180 else
181 test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
182 git update-index --force-remove "$MERGED"
183 fi
184 elif is_submodule "$remote_mode"
185 then
186 ! is_submodule "$local_mode" &&
187 test -e "$MERGED" &&
188 mv -- "$MERGED" "$BACKUP"
189 stage_submodule "$MERGED" "$remote_sha1"
190 else
191 test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
192 git checkout-index -f --stage=3 -- "$MERGED"
193 git add -- "$MERGED"
194 fi
195 cleanup_temp_files --save-backup
196 return 0
197 ;;
198 [aA]*)
199 return 1
200 ;;
201 esac
202 done
203}
204stage_submodule () {
206 path="$1"
207 submodule_sha1="$2"
208 mkdir -p "$path" ||
209 die "fatal: unable to create directory for module at $path"
210 # Find $path relative to work tree
211 work_tree_root=$(cd_to_toplevel && pwd)
212 work_rel_path=$(cd "$path" &&
213 GIT_WORK_TREE="${work_tree_root}" git rev-parse --show-prefix
214 )
215 test -n "$work_rel_path" ||
216 die "fatal: unable to get path of module $path relative to work tree"
217 git update-index --add --replace --cacheinfo 160000 "$submodule_sha1" "${work_rel_path%/}" || die
218}
219checkout_staged_file () {
221 tmpfile=$(expr \
222 "$(git checkout-index --temp --stage="$1" "$2" 2>/dev/null)" \
223 : '\([^ ]*\) ')
224 if test $? -eq 0 && test -n "$tmpfile"
226 then
227 mv -- "$(git rev-parse --show-cdup)$tmpfile" "$3"
228 else
229 >"$3"
230 fi
231}
232merge_file () {
234 MERGED="$1"
235 f=$(git ls-files -u -- "$MERGED")
237 if test -z "$f"
238 then
239 if test ! -f "$MERGED"
240 then
241 echo "$MERGED: file not found"
242 else
243 echo "$MERGED: file does not need merging"
244 fi
245 return 1
246 fi
247 if BASE=$(expr "$MERGED" : '\(.*\)\.[^/]*$')
249 then
250 ext=$(expr "$MERGED" : '.*\(\.[^/]*\)$')
251 else
252 BASE=$MERGED
253 ext=
254 fi
255 mergetool_tmpdir_init
257 if test "$MERGETOOL_TMPDIR" != "."
259 then
260 # If we're using a temporary directory then write to the
261 # top-level of that directory.
262 BASE=${BASE##*/}
263 fi
264 BACKUP="$MERGETOOL_TMPDIR/${BASE}_BACKUP_$$$ext"
266 LOCAL="$MERGETOOL_TMPDIR/${BASE}_LOCAL_$$$ext"
267 REMOTE="$MERGETOOL_TMPDIR/${BASE}_REMOTE_$$$ext"
268 BASE="$MERGETOOL_TMPDIR/${BASE}_BASE_$$$ext"
269 base_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==1) print $1;}')
271 local_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==2) print $1;}')
272 remote_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==3) print $1;}')
273 if is_submodule "$local_mode" || is_submodule "$remote_mode"
275 then
276 echo "Submodule merge conflict for '$MERGED':"
277 local_sha1=$(git ls-files -u -- "$MERGED" | awk '{if ($3==2) print $2;}')
278 remote_sha1=$(git ls-files -u -- "$MERGED" | awk '{if ($3==3) print $2;}')
279 describe_file "$local_mode" "local" "$local_sha1"
280 describe_file "$remote_mode" "remote" "$remote_sha1"
281 resolve_submodule_merge
282 return
283 fi
284 mv -- "$MERGED" "$BACKUP"
286 cp -- "$BACKUP" "$MERGED"
287 checkout_staged_file 1 "$MERGED" "$BASE"
289 checkout_staged_file 2 "$MERGED" "$LOCAL"
290 checkout_staged_file 3 "$MERGED" "$REMOTE"
291 if test -z "$local_mode" || test -z "$remote_mode"
293 then
294 echo "Deleted merge conflict for '$MERGED':"
295 describe_file "$local_mode" "local" "$LOCAL"
296 describe_file "$remote_mode" "remote" "$REMOTE"
297 resolve_deleted_merge
298 return
299 fi
300 if is_symlink "$local_mode" || is_symlink "$remote_mode"
302 then
303 echo "Symbolic link merge conflict for '$MERGED':"
304 describe_file "$local_mode" "local" "$LOCAL"
305 describe_file "$remote_mode" "remote" "$REMOTE"
306 resolve_symlink_merge
307 return
308 fi
309 echo "Normal merge conflict for '$MERGED':"
311 describe_file "$local_mode" "local" "$LOCAL"
312 describe_file "$remote_mode" "remote" "$REMOTE"
313 if test "$guessed_merge_tool" = true || test "$prompt" = true
314 then
315 printf "Hit return to start merge resolution tool (%s): " "$merge_tool"
316 read ans || return 1
317 fi
318 if base_present
320 then
321 present=true
322 else
323 present=false
324 fi
325 if ! run_merge_tool "$merge_tool" "$present"
327 then
328 echo "merge of $MERGED failed" 1>&2
329 mv -- "$BACKUP" "$MERGED"
330 if test "$merge_keep_temporaries" = "false"
332 then
333 cleanup_temp_files
334 fi
335 return 1
337 fi
338 if test "$merge_keep_backup" = "true"
340 then
341 mv -- "$BACKUP" "$MERGED.orig"
342 else
343 rm -- "$BACKUP"
344 fi
345 git add -- "$MERGED"
347 cleanup_temp_files
348 return 0
349}
350prompt=$(git config --bool mergetool.prompt)
352guessed_merge_tool=false
353while test $# != 0
355do
356 case "$1" in
357 --tool-help=*)
358 TOOL_MODE=${1#--tool-help=}
359 show_tool_help
360 ;;
361 --tool-help)
362 show_tool_help
363 ;;
364 -t|--tool*)
365 case "$#,$1" in
366 *,*=*)
367 merge_tool=$(expr "z$1" : 'z-[^=]*=\(.*\)')
368 ;;
369 1,*)
370 usage ;;
371 *)
372 merge_tool="$2"
373 shift ;;
374 esac
375 ;;
376 -y|--no-prompt)
377 prompt=false
378 ;;
379 --prompt)
380 prompt=true
381 ;;
382 --)
383 shift
384 break
385 ;;
386 -*)
387 usage
388 ;;
389 *)
390 break
391 ;;
392 esac
393 shift
394done
395prompt_after_failed_merge () {
397 while true
398 do
399 printf "Continue merging other unresolved paths (y/n) ? "
400 read ans || return 1
401 case "$ans" in
402 [yY]*)
403 return 0
404 ;;
405 [nN]*)
406 return 1
407 ;;
408 esac
409 done
410}
411git_dir_init
413require_work_tree
414if test -z "$merge_tool"
416then
417 # Check if a merge tool has been configured
418 merge_tool=$(get_configured_merge_tool)
419 # Try to guess an appropriate merge tool if no tool has been set.
420 if test -z "$merge_tool"
421 then
422 merge_tool=$(guess_merge_tool) || exit
423 guessed_merge_tool=true
424 fi
425fi
426merge_keep_backup="$(git config --bool mergetool.keepBackup || echo true)"
427merge_keep_temporaries="$(git config --bool mergetool.keepTemporaries || echo false)"
428files=
430if test $# -eq 0
432then
433 cd_to_toplevel
434 if test -e "$GIT_DIR/MERGE_RR"
436 then
437 files=$(git rerere remaining)
438 else
439 files=$(git ls-files -u | sed -e 's/^[^ ]* //' | sort -u)
440 fi
441else
442 files=$(git ls-files -u -- "$@" | sed -e 's/^[^ ]* //' | sort -u)
443fi
444if test -z "$files"
446then
447 echo "No files need merging"
448 exit 0
449fi
450printf "Merging:\n"
452printf "%s\n" "$files"
453IFS='
455'
456rc=0
457for i in $files
458do
459 printf "\n"
460 if ! merge_file "$i"
461 then
462 rc=1
463 prompt_after_failed_merge || exit 1
464 fi
465done
466exit $rc