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] [-g|--gui|--no-gui] [-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" "${work_rel_path%/}" || die
228}
229checkout_staged_file () {
231 tmpfile="$(git checkout-index --temp --stage="$1" "$2" 2>/dev/null)" &&
232 tmpfile=${tmpfile%%' '*}
233 if test $? -eq 0 && test -n "$tmpfile"
235 then
236 mv -- "$(git rev-parse --show-cdup)$tmpfile" "$3"
237 else
238 >"$3"
239 fi
240}
241merge_file () {
243 MERGED="$1"
244 f=$(git ls-files -u -- "$MERGED")
246 if test -z "$f"
247 then
248 if test ! -f "$MERGED"
249 then
250 echo "$MERGED: file not found"
251 else
252 echo "$MERGED: file does not need merging"
253 fi
254 return 1
255 fi
256 # extract file extension from the last path component
258 case "${MERGED##*/}" in
259 *.*)
260 ext=.${MERGED##*.}
261 BASE=${MERGED%"$ext"}
262 ;;
263 *)
264 BASE=$MERGED
265 ext=
266 esac
267 mergetool_tmpdir_init
269 if test "$MERGETOOL_TMPDIR" != "."
271 then
272 # If we're using a temporary directory then write to the
273 # top-level of that directory.
274 BASE=${BASE##*/}
275 fi
276 BACKUP="$MERGETOOL_TMPDIR/${BASE}_BACKUP_$$$ext"
278 LOCAL="$MERGETOOL_TMPDIR/${BASE}_LOCAL_$$$ext"
279 REMOTE="$MERGETOOL_TMPDIR/${BASE}_REMOTE_$$$ext"
280 BASE="$MERGETOOL_TMPDIR/${BASE}_BASE_$$$ext"
281 base_mode= local_mode= remote_mode=
283 # here, $IFS is just a LF
285 for line in $f
286 do
287 mode=${line%% *} # 1st word
288 sha1=${line#"$mode "}
289 sha1=${sha1%% *} # 2nd word
290 case "${line#$mode $sha1 }" in # remainder
291 '1 '*)
292 base_mode=$mode
293 ;;
294 '2 '*)
295 local_mode=$mode local_sha1=$sha1
296 ;;
297 '3 '*)
298 remote_mode=$mode remote_sha1=$sha1
299 ;;
300 esac
301 done
302 if is_submodule "$local_mode" || is_submodule "$remote_mode"
304 then
305 echo "Submodule merge conflict for '$MERGED':"
306 describe_file "$local_mode" "local" "$local_sha1"
307 describe_file "$remote_mode" "remote" "$remote_sha1"
308 resolve_submodule_merge
309 return
310 fi
311 if test -f "$MERGED"
313 then
314 mv -- "$MERGED" "$BACKUP"
315 cp -- "$BACKUP" "$MERGED"
316 fi
317 # Create a parent directory to handle delete/delete conflicts
318 # where the base's directory no longer exists.
319 mkdir -p "$(dirname "$MERGED")"
320 checkout_staged_file 1 "$MERGED" "$BASE"
322 checkout_staged_file 2 "$MERGED" "$LOCAL"
323 checkout_staged_file 3 "$MERGED" "$REMOTE"
324 if test -z "$local_mode" || test -z "$remote_mode"
326 then
327 echo "Deleted merge conflict for '$MERGED':"
328 describe_file "$local_mode" "local" "$LOCAL"
329 describe_file "$remote_mode" "remote" "$REMOTE"
330 resolve_deleted_merge
331 status=$?
332 rmdir -p "$(dirname "$MERGED")" 2>/dev/null
333 return $status
334 fi
335 if is_symlink "$local_mode" || is_symlink "$remote_mode"
337 then
338 echo "Symbolic link merge conflict for '$MERGED':"
339 describe_file "$local_mode" "local" "$LOCAL"
340 describe_file "$remote_mode" "remote" "$REMOTE"
341 resolve_symlink_merge
342 return
343 fi
344 echo "Normal merge conflict for '$MERGED':"
346 describe_file "$local_mode" "local" "$LOCAL"
347 describe_file "$remote_mode" "remote" "$REMOTE"
348 if test "$guessed_merge_tool" = true || test "$prompt" = true
349 then
350 printf "Hit return to start merge resolution tool (%s): " "$merge_tool"
351 read ans || return 1
352 fi
353 if base_present
355 then
356 present=true
357 else
358 present=false
359 fi
360 if ! run_merge_tool "$merge_tool" "$present"
362 then
363 echo "merge of $MERGED failed" 1>&2
364 mv -- "$BACKUP" "$MERGED"
365 if test "$merge_keep_temporaries" = "false"
367 then
368 cleanup_temp_files
369 fi
370 return 1
372 fi
373 if test "$merge_keep_backup" = "true"
375 then
376 mv -- "$BACKUP" "$MERGED.orig"
377 else
378 rm -- "$BACKUP"
379 fi
380 git add -- "$MERGED"
382 cleanup_temp_files
383 return 0
384}
385prompt_after_failed_merge () {
387 while true
388 do
389 printf "Continue merging other unresolved paths [y/n]? "
390 read ans || return 1
391 case "$ans" in
392 [yY]*)
393 return 0
394 ;;
395 [nN]*)
396 return 1
397 ;;
398 esac
399 done
400}
401print_noop_and_exit () {
403 echo "No files need merging"
404 exit 0
405}
406main () {
408 prompt=$(git config --bool mergetool.prompt)
409 GIT_MERGETOOL_GUI=false
410 guessed_merge_tool=false
411 orderfile=
412 while test $# != 0
414 do
415 case "$1" in
416 --tool-help=*)
417 TOOL_MODE=${1#--tool-help=}
418 show_tool_help
419 ;;
420 --tool-help)
421 show_tool_help
422 ;;
423 -t|--tool*)
424 case "$#,$1" in
425 *,*=*)
426 merge_tool=${1#*=}
427 ;;
428 1,*)
429 usage ;;
430 *)
431 merge_tool="$2"
432 shift ;;
433 esac
434 ;;
435 --no-gui)
436 GIT_MERGETOOL_GUI=false
437 ;;
438 -g|--gui)
439 GIT_MERGETOOL_GUI=true
440 ;;
441 -y|--no-prompt)
442 prompt=false
443 ;;
444 --prompt)
445 prompt=true
446 ;;
447 -O*)
448 orderfile="${1#-O}"
449 ;;
450 --)
451 shift
452 break
453 ;;
454 -*)
455 usage
456 ;;
457 *)
458 break
459 ;;
460 esac
461 shift
462 done
463 git_dir_init
465 require_work_tree
466 if test -z "$merge_tool"
468 then
469 if ! merge_tool=$(get_merge_tool)
470 then
471 guessed_merge_tool=true
472 fi
473 fi
474 merge_keep_backup="$(git config --bool mergetool.keepBackup || echo true)"
475 merge_keep_temporaries="$(git config --bool mergetool.keepTemporaries || echo false)"
476 prefix=$(git rev-parse --show-prefix) || exit 1
478 cd_to_toplevel
479 if test -n "$orderfile"
481 then
482 orderfile=$(
483 git rev-parse --prefix "$prefix" -- "$orderfile" |
484 sed -e 1d
485 )
486 fi
487 if test $# -eq 0 && test -e "$GIT_DIR/MERGE_RR"
489 then
490 set -- $(git rerere remaining)
491 if test $# -eq 0
492 then
493 print_noop_and_exit
494 fi
495 elif test $# -ge 0
496 then
497 # rev-parse provides the -- needed for 'set'
498 eval "set $(git rev-parse --sq --prefix "$prefix" -- "$@")"
499 fi
500 files=$(git -c core.quotePath=false \
502 diff --name-only --diff-filter=U \
503 ${orderfile:+"-O$orderfile"} -- "$@")
504 if test -z "$files"
506 then
507 print_noop_and_exit
508 fi
509 printf "Merging:\n"
511 printf "%s\n" "$files"
512 rc=0
514 set -- $files
515 while test $# -ne 0
516 do
517 printf "\n"
518 if ! merge_file "$1"
519 then
520 rc=1
521 test $# -ne 1 && prompt_after_failed_merge || exit 1
522 fi
523 shift
524 done
525 exit $rc
527}
528main "$@"