1#!/bin/sh
2#
3# This program resolves merge conflicts in git
4#
5# Copyright (c) 2006 Theodore Y. Ts'o
6# Copyright (c) 2009-2016 David Aguilar
7#
8# This file is licensed under the GPL v2, or a later version
9# at the discretion of Junio C Hamano.
10#
11USAGE='[--tool=tool] [--tool-help] [-y|--no-prompt|--prompt] [-O<orderfile>] [file to merge] ...'
13SUBDIRECTORY_OK=Yes
14NONGIT_OK=Yes
15OPTIONS_SPEC=
16TOOL_MODE=merge
17. git-sh-setup
18. git-mergetool--lib
19# Returns true if the mode reflects a symlink
21is_symlink () {
22 test "$1" = 120000
23}
24is_submodule () {
26 test "$1" = 160000
27}
28local_present () {
30 test -n "$local_mode"
31}
32remote_present () {
34 test -n "$remote_mode"
35}
36base_present () {
38 test -n "$base_mode"
39}
40mergetool_tmpdir_init () {
42 if test "$(git config --bool mergetool.writeToTemp)" != true
43 then
44 MERGETOOL_TMPDIR=.
45 return 0
46 fi
47 if MERGETOOL_TMPDIR=$(mktemp -d -t "git-mergetool-XXXXXX" 2>/dev/null)
48 then
49 return 0
50 fi
51 die "error: mktemp is needed when 'mergetool.writeToTemp' is true"
52}
53cleanup_temp_files () {
55 if test "$1" = --save-backup
56 then
57 rm -rf -- "$MERGED.orig"
58 test -e "$BACKUP" && mv -- "$BACKUP" "$MERGED.orig"
59 rm -f -- "$LOCAL" "$REMOTE" "$BASE"
60 else
61 rm -f -- "$LOCAL" "$REMOTE" "$BASE" "$BACKUP"
62 fi
63 if test "$MERGETOOL_TMPDIR" != "."
64 then
65 rmdir "$MERGETOOL_TMPDIR"
66 fi
67}
68describe_file () {
70 mode="$1"
71 branch="$2"
72 file="$3"
73 printf " {%s}: " "$branch"
75 if test -z "$mode"
76 then
77 echo "deleted"
78 elif is_symlink "$mode"
79 then
80 echo "a symbolic link -> '$(cat "$file")'"
81 elif is_submodule "$mode"
82 then
83 echo "submodule commit $file"
84 elif base_present
85 then
86 echo "modified file"
87 else
88 echo "created file"
89 fi
90}
91resolve_symlink_merge () {
93 while true
94 do
95 printf "Use (l)ocal or (r)emote, or (a)bort? "
96 read ans || return 1
97 case "$ans" in
98 [lL]*)
99 git checkout-index -f --stage=2 -- "$MERGED"
100 git add -- "$MERGED"
101 cleanup_temp_files --save-backup
102 return 0
103 ;;
104 [rR]*)
105 git checkout-index -f --stage=3 -- "$MERGED"
106 git add -- "$MERGED"
107 cleanup_temp_files --save-backup
108 return 0
109 ;;
110 [aA]*)
111 return 1
112 ;;
113 esac
114 done
115}
116resolve_deleted_merge () {
118 while true
119 do
120 if base_present
121 then
122 printf "Use (m)odified or (d)eleted file, or (a)bort? "
123 else
124 printf "Use (c)reated or (d)eleted file, or (a)bort? "
125 fi
126 read ans || return 1
127 case "$ans" in
128 [mMcC]*)
129 git add -- "$MERGED"
130 if test "$merge_keep_backup" = "true"
131 then
132 cleanup_temp_files --save-backup
133 else
134 cleanup_temp_files
135 fi
136 return 0
137 ;;
138 [dD]*)
139 git rm -- "$MERGED" > /dev/null
140 cleanup_temp_files
141 return 0
142 ;;
143 [aA]*)
144 if test "$merge_keep_temporaries" = "false"
145 then
146 cleanup_temp_files
147 fi
148 return 1
149 ;;
150 esac
151 done
152}
153resolve_submodule_merge () {
155 while true
156 do
157 printf "Use (l)ocal or (r)emote, or (a)bort? "
158 read ans || return 1
159 case "$ans" in
160 [lL]*)
161 if ! local_present
162 then
163 if test -n "$(git ls-tree HEAD -- "$MERGED")"
164 then
165 # Local isn't present, but it's a subdirectory
166 git ls-tree --full-name -r HEAD -- "$MERGED" |
167 git update-index --index-info || exit $?
168 else
169 test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
170 git update-index --force-remove "$MERGED"
171 cleanup_temp_files --save-backup
172 fi
173 elif is_submodule "$local_mode"
174 then
175 stage_submodule "$MERGED" "$local_sha1"
176 else
177 git checkout-index -f --stage=2 -- "$MERGED"
178 git add -- "$MERGED"
179 fi
180 return 0
181 ;;
182 [rR]*)
183 if ! remote_present
184 then
185 if test -n "$(git ls-tree MERGE_HEAD -- "$MERGED")"
186 then
187 # Remote isn't present, but it's a subdirectory
188 git ls-tree --full-name -r MERGE_HEAD -- "$MERGED" |
189 git update-index --index-info || exit $?
190 else
191 test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
192 git update-index --force-remove "$MERGED"
193 fi
194 elif is_submodule "$remote_mode"
195 then
196 ! is_submodule "$local_mode" &&
197 test -e "$MERGED" &&
198 mv -- "$MERGED" "$BACKUP"
199 stage_submodule "$MERGED" "$remote_sha1"
200 else
201 test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
202 git checkout-index -f --stage=3 -- "$MERGED"
203 git add -- "$MERGED"
204 fi
205 cleanup_temp_files --save-backup
206 return 0
207 ;;
208 [aA]*)
209 return 1
210 ;;
211 esac
212 done
213}
214stage_submodule () {
216 path="$1"
217 submodule_sha1="$2"
218 mkdir -p "$path" ||
219 die "fatal: unable to create directory for module at $path"
220 # Find $path relative to work tree
221 work_tree_root=$(cd_to_toplevel && pwd)
222 work_rel_path=$(cd "$path" &&
223 GIT_WORK_TREE="${work_tree_root}" git rev-parse --show-prefix
224 )
225 test -n "$work_rel_path" ||
226 die "fatal: unable to get path of module $path relative to work tree"
227 git update-index --add --replace --cacheinfo 160000 "$submodule_sha1" "${work_rel_path%/}" || die
228}
229checkout_staged_file () {
231 tmpfile=$(expr \
232 "$(git checkout-index --temp --stage="$1" "$2" 2>/dev/null)" \
233 : '\([^ ]*\) ')
234 if test $? -eq 0 && test -n "$tmpfile"
236 then
237 mv -- "$(git rev-parse --show-cdup)$tmpfile" "$3"
238 else
239 >"$3"
240 fi
241}
242merge_file () {
244 MERGED="$1"
245 f=$(git ls-files -u -- "$MERGED")
247 if test -z "$f"
248 then
249 if test ! -f "$MERGED"
250 then
251 echo "$MERGED: file not found"
252 else
253 echo "$MERGED: file does not need merging"
254 fi
255 return 1
256 fi
257 if BASE=$(expr "$MERGED" : '\(.*\)\.[^/]*$')
259 then
260 ext=$(expr "$MERGED" : '.*\(\.[^/]*\)$')
261 else
262 BASE=$MERGED
263 ext=
264 fi
265 mergetool_tmpdir_init
267 if test "$MERGETOOL_TMPDIR" != "."
269 then
270 # If we're using a temporary directory then write to the
271 # top-level of that directory.
272 BASE=${BASE##*/}
273 fi
274 BACKUP="$MERGETOOL_TMPDIR/${BASE}_BACKUP_$$$ext"
276 LOCAL="$MERGETOOL_TMPDIR/${BASE}_LOCAL_$$$ext"
277 REMOTE="$MERGETOOL_TMPDIR/${BASE}_REMOTE_$$$ext"
278 BASE="$MERGETOOL_TMPDIR/${BASE}_BASE_$$$ext"
279 base_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==1) print $1;}')
281 local_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==2) print $1;}')
282 remote_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==3) print $1;}')
283 if is_submodule "$local_mode" || is_submodule "$remote_mode"
285 then
286 echo "Submodule merge conflict for '$MERGED':"
287 local_sha1=$(git ls-files -u -- "$MERGED" | awk '{if ($3==2) print $2;}')
288 remote_sha1=$(git ls-files -u -- "$MERGED" | awk '{if ($3==3) print $2;}')
289 describe_file "$local_mode" "local" "$local_sha1"
290 describe_file "$remote_mode" "remote" "$remote_sha1"
291 resolve_submodule_merge
292 return
293 fi
294 if test -f "$MERGED"
296 then
297 mv -- "$MERGED" "$BACKUP"
298 cp -- "$BACKUP" "$MERGED"
299 fi
300 # Create a parent directory to handle delete/delete conflicts
301 # where the base's directory no longer exists.
302 mkdir -p "$(dirname "$MERGED")"
303 checkout_staged_file 1 "$MERGED" "$BASE"
305 checkout_staged_file 2 "$MERGED" "$LOCAL"
306 checkout_staged_file 3 "$MERGED" "$REMOTE"
307 if test -z "$local_mode" || test -z "$remote_mode"
309 then
310 echo "Deleted merge conflict for '$MERGED':"
311 describe_file "$local_mode" "local" "$LOCAL"
312 describe_file "$remote_mode" "remote" "$REMOTE"
313 resolve_deleted_merge
314 status=$?
315 rmdir -p "$(dirname "$MERGED")" 2>/dev/null
316 return $status
317 fi
318 if is_symlink "$local_mode" || is_symlink "$remote_mode"
320 then
321 echo "Symbolic link merge conflict for '$MERGED':"
322 describe_file "$local_mode" "local" "$LOCAL"
323 describe_file "$remote_mode" "remote" "$REMOTE"
324 resolve_symlink_merge
325 return
326 fi
327 echo "Normal merge conflict for '$MERGED':"
329 describe_file "$local_mode" "local" "$LOCAL"
330 describe_file "$remote_mode" "remote" "$REMOTE"
331 if test "$guessed_merge_tool" = true || test "$prompt" = true
332 then
333 printf "Hit return to start merge resolution tool (%s): " "$merge_tool"
334 read ans || return 1
335 fi
336 if base_present
338 then
339 present=true
340 else
341 present=false
342 fi
343 if ! run_merge_tool "$merge_tool" "$present"
345 then
346 echo "merge of $MERGED failed" 1>&2
347 mv -- "$BACKUP" "$MERGED"
348 if test "$merge_keep_temporaries" = "false"
350 then
351 cleanup_temp_files
352 fi
353 return 1
355 fi
356 if test "$merge_keep_backup" = "true"
358 then
359 mv -- "$BACKUP" "$MERGED.orig"
360 else
361 rm -- "$BACKUP"
362 fi
363 git add -- "$MERGED"
365 cleanup_temp_files
366 return 0
367}
368prompt_after_failed_merge () {
370 while true
371 do
372 printf "Continue merging other unresolved paths [y/n]? "
373 read ans || return 1
374 case "$ans" in
375 [yY]*)
376 return 0
377 ;;
378 [nN]*)
379 return 1
380 ;;
381 esac
382 done
383}
384print_noop_and_exit () {
386 echo "No files need merging"
387 exit 0
388}
389main () {
391 prompt=$(git config --bool mergetool.prompt)
392 guessed_merge_tool=false
393 orderfile=
394 while test $# != 0
396 do
397 case "$1" in
398 --tool-help=*)
399 TOOL_MODE=${1#--tool-help=}
400 show_tool_help
401 ;;
402 --tool-help)
403 show_tool_help
404 ;;
405 -t|--tool*)
406 case "$#,$1" in
407 *,*=*)
408 merge_tool=$(expr "z$1" : 'z-[^=]*=\(.*\)')
409 ;;
410 1,*)
411 usage ;;
412 *)
413 merge_tool="$2"
414 shift ;;
415 esac
416 ;;
417 -y|--no-prompt)
418 prompt=false
419 ;;
420 --prompt)
421 prompt=true
422 ;;
423 -O*)
424 orderfile="${1#-O}"
425 ;;
426 --)
427 shift
428 break
429 ;;
430 -*)
431 usage
432 ;;
433 *)
434 break
435 ;;
436 esac
437 shift
438 done
439 git_dir_init
441 require_work_tree
442 if test -z "$merge_tool"
444 then
445 # Check if a merge tool has been configured
446 merge_tool=$(get_configured_merge_tool)
447 # Try to guess an appropriate merge tool if no tool has been set.
448 if test -z "$merge_tool"
449 then
450 merge_tool=$(guess_merge_tool) || exit
451 guessed_merge_tool=true
452 fi
453 fi
454 merge_keep_backup="$(git config --bool mergetool.keepBackup || echo true)"
455 merge_keep_temporaries="$(git config --bool mergetool.keepTemporaries || echo false)"
456 prefix=$(git rev-parse --show-prefix) || exit 1
458 cd_to_toplevel
459 if test -n "$orderfile"
461 then
462 orderfile=$(
463 git rev-parse --prefix "$prefix" -- "$orderfile" |
464 sed -e 1d
465 )
466 fi
467 if test $# -eq 0 && test -e "$GIT_DIR/MERGE_RR"
469 then
470 set -- $(git rerere remaining)
471 if test $# -eq 0
472 then
473 print_noop_and_exit
474 fi
475 elif test $# -ge 0
476 then
477 # rev-parse provides the -- needed for 'set'
478 eval "set $(git rev-parse --sq --prefix "$prefix" -- "$@")"
479 fi
480 files=$(git -c core.quotePath=false \
482 diff --name-only --diff-filter=U \
483 ${orderfile:+"-O$orderfile"} -- "$@")
484 if test -z "$files"
486 then
487 print_noop_and_exit
488 fi
489 printf "Merging:\n"
491 printf "%s\n" "$files"
492 rc=0
494 set -- $files
495 while test $# -ne 0
496 do
497 printf "\n"
498 if ! merge_file "$1"
499 then
500 rc=1
501 test $# -ne 1 && prompt_after_failed_merge || exit 1
502 fi
503 shift
504 done
505 exit $rc
507}
508main "$@"