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Commit | Line | Data |
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91063bbc JH |
1 | #!/bin/sh |
2 | # | |
3 | # Copyright (c) 2005 Junio C Hamano | |
4 | # | |
5 | ||
b0bf1d8b PH |
6 | OPTIONS_KEEPDASHDASH= |
7 | OPTIONS_SPEC="\ | |
8 | git-merge [options] <remote>... | |
9 | git-merge [options] <msg> HEAD <remote> | |
10 | -- | |
11 | summary show a diffstat at the end of the merge | |
12 | n,no-summary don't show a diffstat at the end of the merge | |
13 | squash create a single commit instead of doing a merge | |
14 | commit perform a commit if the merge sucesses (default) | |
15 | ff allow fast forward (default) | |
16 | s,strategy= merge strategy to use | |
17 | m,message= message to be used for the merge commit (if any) | |
18 | " | |
17bcdad3 | 19 | |
533b7039 | 20 | SUBDIRECTORY_OK=Yes |
ae2b0f15 | 21 | . git-sh-setup |
7eff28a9 | 22 | require_work_tree |
533b7039 | 23 | cd_to_toplevel |
91063bbc | 24 | |
d1014a17 | 25 | test -z "$(git ls-files -u)" || |
533b7039 | 26 | die "You are in the middle of a conflicted merge." |
d1014a17 | 27 | |
91063bbc JH |
28 | LF=' |
29 | ' | |
30 | ||
68faf689 | 31 | all_strategies='recur recursive octopus resolve stupid ours subtree' |
a06f678e | 32 | default_twohead_strategies='recursive' |
6ea23343 | 33 | default_octopus_strategies='octopus' |
a0050852 JH |
34 | no_fast_forward_strategies='subtree ours' |
35 | no_trivial_strategies='recursive recur subtree ours' | |
91063bbc | 36 | use_strategies= |
6ea23343 | 37 | |
a0050852 JH |
38 | allow_fast_forward=t |
39 | allow_trivial_merge=t | |
e6d1f76c | 40 | squash= no_commit= |
91063bbc | 41 | |
a9358240 | 42 | dropsave() { |
deca7e8c | 43 | rm -f -- "$GIT_DIR/MERGE_HEAD" "$GIT_DIR/MERGE_MSG" \ |
a64d7784 | 44 | "$GIT_DIR/MERGE_STASH" || exit 1 |
a9358240 JH |
45 | } |
46 | ||
47 | savestate() { | |
60fa0560 | 48 | # Stash away any local modifications. |
a64d7784 | 49 | git stash create >"$GIT_DIR/MERGE_STASH" |
a9358240 JH |
50 | } |
51 | ||
52 | restorestate() { | |
a64d7784 | 53 | if test -f "$GIT_DIR/MERGE_STASH" |
deca7e8c | 54 | then |
228e2eb6 | 55 | git reset --hard $head >/dev/null |
a64d7784 | 56 | git stash apply $(cat "$GIT_DIR/MERGE_STASH") |
5be60078 | 57 | git update-index --refresh >/dev/null |
deca7e8c | 58 | fi |
91063bbc JH |
59 | } |
60 | ||
7d0c6887 JH |
61 | finish_up_to_date () { |
62 | case "$squash" in | |
63 | t) | |
64 | echo "$1 (nothing to squash)" ;; | |
65 | '') | |
66 | echo "$1" ;; | |
67 | esac | |
68 | dropsave | |
69 | } | |
70 | ||
71 | squash_message () { | |
72 | echo Squashed commit of the following: | |
73 | echo | |
9225d7be | 74 | git log --no-merges --pretty=medium ^"$head" $remoteheads |
7d0c6887 JH |
75 | } |
76 | ||
4f692b19 | 77 | finish () { |
e1447e38 SP |
78 | if test '' = "$2" |
79 | then | |
f9474132 | 80 | rlogm="$GIT_REFLOG_ACTION" |
e1447e38 SP |
81 | else |
82 | echo "$2" | |
f9474132 | 83 | rlogm="$GIT_REFLOG_ACTION: $2" |
e1447e38 | 84 | fi |
7d0c6887 JH |
85 | case "$squash" in |
86 | t) | |
87 | echo "Squash commit -- not updating HEAD" | |
88 | squash_message >"$GIT_DIR/SQUASH_MSG" | |
4f692b19 | 89 | ;; |
7d0c6887 JH |
90 | '') |
91 | case "$merge_msg" in | |
92 | '') | |
93 | echo "No merge message -- not updating HEAD" | |
94 | ;; | |
95 | *) | |
5be60078 | 96 | git update-ref -m "$rlogm" HEAD "$1" "$head" || exit 1 |
d4bb43ee | 97 | git gc --auto |
7d0c6887 JH |
98 | ;; |
99 | esac | |
4f692b19 JH |
100 | ;; |
101 | esac | |
7d0c6887 | 102 | case "$1" in |
91063bbc | 103 | '') |
7d0c6887 JH |
104 | ;; |
105 | ?*) | |
51e7ecf4 AR |
106 | if test "$show_diffstat" = t |
107 | then | |
fefe49d1 | 108 | # We want color (if set), but no pager |
5be60078 | 109 | GIT_PAGER='' git diff --stat --summary -M "$head" "$1" |
51e7ecf4 | 110 | fi |
91063bbc JH |
111 | ;; |
112 | esac | |
46232915 JE |
113 | |
114 | # Run a post-merge hook | |
115 | if test -x "$GIT_DIR"/hooks/post-merge | |
116 | then | |
117 | case "$squash" in | |
118 | t) | |
119 | "$GIT_DIR"/hooks/post-merge 1 | |
120 | ;; | |
121 | '') | |
122 | "$GIT_DIR"/hooks/post-merge 0 | |
123 | ;; | |
124 | esac | |
125 | fi | |
91063bbc JH |
126 | } |
127 | ||
b1bfcae4 JH |
128 | merge_name () { |
129 | remote="$1" | |
5be60078 JH |
130 | rh=$(git rev-parse --verify "$remote^0" 2>/dev/null) || return |
131 | bh=$(git show-ref -s --verify "refs/heads/$remote" 2>/dev/null) | |
b1bfcae4 JH |
132 | if test "$rh" = "$bh" |
133 | then | |
134 | echo "$rh branch '$remote' of ." | |
135 | elif truname=$(expr "$remote" : '\(.*\)~[1-9][0-9]*$') && | |
5be60078 | 136 | git show-ref -q --verify "refs/heads/$truname" 2>/dev/null |
b1bfcae4 JH |
137 | then |
138 | echo "$rh branch '$truname' (early part) of ." | |
85295a52 MT |
139 | elif test "$remote" = "FETCH_HEAD" -a -r "$GIT_DIR/FETCH_HEAD" |
140 | then | |
141 | sed -e 's/ not-for-merge / /' -e 1q \ | |
142 | "$GIT_DIR/FETCH_HEAD" | |
b1bfcae4 JH |
143 | else |
144 | echo "$rh commit '$remote'" | |
145 | fi | |
146 | } | |
147 | ||
aec7b362 | 148 | parse_config () { |
b0bf1d8b PH |
149 | while test $# != 0; do |
150 | case "$1" in | |
151 | -n|--no-summary) | |
152 | show_diffstat=false ;; | |
153 | --summary) | |
154 | show_diffstat=t ;; | |
155 | --squash) | |
e6d1f76c GP |
156 | test "$allow_fast_forward" = t || |
157 | die "You cannot combine --squash with --no-ff." | |
158 | squash=t no_commit=t ;; | |
b0bf1d8b | 159 | --no-squash) |
e6d1f76c | 160 | squash= no_commit= ;; |
b0bf1d8b | 161 | --commit) |
e6d1f76c | 162 | no_commit= ;; |
b0bf1d8b | 163 | --no-commit) |
e6d1f76c | 164 | no_commit=t ;; |
b0bf1d8b | 165 | --ff) |
e6d1f76c | 166 | allow_fast_forward=t ;; |
b0bf1d8b | 167 | --no-ff) |
e6d1f76c GP |
168 | test "$squash" != t || |
169 | die "You cannot combine --squash with --no-ff." | |
170 | allow_fast_forward=f ;; | |
b0bf1d8b PH |
171 | -s|--strategy) |
172 | shift | |
173 | case " $all_strategies " in | |
174 | *" $1 "*) | |
175 | use_strategies="$use_strategies$1 " ;; | |
176 | *) | |
177 | die "available strategies are: $all_strategies" ;; | |
178 | esac | |
179 | ;; | |
180 | -m|--message) | |
181 | shift | |
182 | merge_msg="$1" | |
183 | have_message=t | |
184 | ;; | |
185 | --) | |
aec7b362 | 186 | shift |
b0bf1d8b PH |
187 | break ;; |
188 | *) usage ;; | |
189 | esac | |
190 | shift | |
aec7b362 | 191 | done |
b0bf1d8b | 192 | args_left=$# |
aec7b362 LH |
193 | } |
194 | ||
d38eb710 LH |
195 | test $# != 0 || usage |
196 | ||
197 | have_message= | |
aec7b362 LH |
198 | |
199 | if branch=$(git-symbolic-ref -q HEAD) | |
200 | then | |
201 | mergeopts=$(git config "branch.${branch#refs/heads/}.mergeoptions") | |
202 | if test -n "$mergeopts" | |
203 | then | |
b0bf1d8b | 204 | parse_config $mergeopts -- |
aec7b362 LH |
205 | fi |
206 | fi | |
207 | ||
b0bf1d8b PH |
208 | parse_config "$@" |
209 | while test $args_left -lt $#; do shift; done | |
91063bbc | 210 | |
51e7ecf4 | 211 | if test -z "$show_diffstat"; then |
5be60078 | 212 | test "$(git config --bool merge.diffstat)" = false && show_diffstat=false |
51e7ecf4 AR |
213 | test -z "$show_diffstat" && show_diffstat=t |
214 | fi | |
215 | ||
17bcdad3 JH |
216 | # This could be traditional "merge <msg> HEAD <commit>..." and the |
217 | # way we can tell it is to see if the second token is HEAD, but some | |
218 | # people might have misused the interface and used a committish that | |
219 | # is the same as HEAD there instead. Traditional format never would | |
220 | # have "-m" so it is an additional safety measure to check for it. | |
221 | ||
222 | if test -z "$have_message" && | |
5be60078 JH |
223 | second_token=$(git rev-parse --verify "$2^0" 2>/dev/null) && |
224 | head_commit=$(git rev-parse --verify "HEAD" 2>/dev/null) && | |
17bcdad3 JH |
225 | test "$second_token" = "$head_commit" |
226 | then | |
227 | merge_msg="$1" | |
228 | shift | |
229 | head_arg="$1" | |
230 | shift | |
5be60078 | 231 | elif ! git rev-parse --verify HEAD >/dev/null 2>&1 |
8092c7f6 JH |
232 | then |
233 | # If the merged head is a valid one there is no reason to | |
234 | # forbid "git merge" into a branch yet to be born. We do | |
235 | # the same for "git pull". | |
236 | if test 1 -ne $# | |
237 | then | |
238 | echo >&2 "Can merge only exactly one commit into empty head" | |
239 | exit 1 | |
240 | fi | |
241 | ||
242 | rh=$(git rev-parse --verify "$1^0") || | |
243 | die "$1 - not something we can merge" | |
244 | ||
5be60078 JH |
245 | git update-ref -m "initial pull" HEAD "$rh" "" && |
246 | git read-tree --reset -u HEAD | |
8092c7f6 JH |
247 | exit |
248 | ||
17bcdad3 JH |
249 | else |
250 | # We are invoked directly as the first-class UI. | |
251 | head_arg=HEAD | |
252 | ||
253 | # All the rest are the commits being merged; prepare | |
254 | # the standard merge summary message to be appended to | |
255 | # the given message. If remote is invalid we will die | |
256 | # later in the common codepath so we discard the error | |
257 | # in this loop. | |
258 | merge_name=$(for remote | |
259 | do | |
b1bfcae4 | 260 | merge_name "$remote" |
5be60078 | 261 | done | git fmt-merge-msg |
17bcdad3 JH |
262 | ) |
263 | merge_msg="${merge_msg:+$merge_msg$LF$LF}$merge_name" | |
264 | fi | |
5be60078 | 265 | head=$(git rev-parse --verify "$head_arg"^0) || usage |
91063bbc JH |
266 | |
267 | # All the rest are remote heads | |
6ea23343 | 268 | test "$#" = 0 && usage ;# we need at least one remote head. |
7f9acb2a | 269 | set_reflog_action "merge $*" |
6ea23343 | 270 | |
9954f5b8 | 271 | remoteheads= |
91063bbc JH |
272 | for remote |
273 | do | |
5be60078 | 274 | remotehead=$(git rev-parse --verify "$remote"^0 2>/dev/null) || |
91063bbc | 275 | die "$remote - not something we can merge" |
9954f5b8 | 276 | remoteheads="${remoteheads}$remotehead " |
e0ec1819 SP |
277 | eval GITHEAD_$remotehead='"$remote"' |
278 | export GITHEAD_$remotehead | |
91063bbc | 279 | done |
9954f5b8 | 280 | set x $remoteheads ; shift |
91063bbc | 281 | |
6ea23343 JH |
282 | case "$use_strategies" in |
283 | '') | |
284 | case "$#" in | |
285 | 1) | |
5be60078 | 286 | var="`git config --get pull.twohead`" |
de811948 SP |
287 | if test -n "$var" |
288 | then | |
289 | use_strategies="$var" | |
290 | else | |
291 | use_strategies="$default_twohead_strategies" | |
292 | fi ;; | |
6ea23343 | 293 | *) |
5be60078 | 294 | var="`git config --get pull.octopus`" |
de811948 SP |
295 | if test -n "$var" |
296 | then | |
297 | use_strategies="$var" | |
298 | else | |
299 | use_strategies="$default_octopus_strategies" | |
300 | fi ;; | |
6ea23343 JH |
301 | esac |
302 | ;; | |
303 | esac | |
304 | ||
305 | for s in $use_strategies | |
306 | do | |
a0050852 | 307 | for ss in $no_fast_forward_strategies |
de6f0def JH |
308 | do |
309 | case " $s " in | |
a0050852 JH |
310 | *" $ss "*) |
311 | allow_fast_forward=f | |
312 | break | |
313 | ;; | |
314 | esac | |
315 | done | |
316 | for ss in $no_trivial_strategies | |
317 | do | |
318 | case " $s " in | |
319 | *" $ss "*) | |
320 | allow_trivial_merge=f | |
de6f0def JH |
321 | break |
322 | ;; | |
323 | esac | |
324 | done | |
6ea23343 JH |
325 | done |
326 | ||
13956670 JH |
327 | case "$#" in |
328 | 1) | |
5be60078 | 329 | common=$(git merge-base --all $head "$@") |
13956670 JH |
330 | ;; |
331 | *) | |
5be60078 | 332 | common=$(git show-branch --merge-base $head "$@") |
13956670 JH |
333 | ;; |
334 | esac | |
91063bbc JH |
335 | echo "$head" >"$GIT_DIR/ORIG_HEAD" |
336 | ||
a0050852 | 337 | case "$allow_fast_forward,$#,$common,$no_commit" in |
6ea23343 | 338 | ?,*,'',*) |
88f8f0a5 | 339 | # No common ancestors found. We need a real merge. |
91063bbc | 340 | ;; |
6ea23343 | 341 | ?,1,"$1",*) |
91063bbc | 342 | # If head can reach all the merge then we are up to date. |
6ea23343 | 343 | # but first the most common case of merging one remote. |
7d0c6887 | 344 | finish_up_to_date "Already up-to-date." |
91063bbc JH |
345 | exit 0 |
346 | ;; | |
a0050852 | 347 | t,1,"$head",*) |
91063bbc | 348 | # Again the most common case of merging one remote. |
5be60078 JH |
349 | echo "Updating $(git rev-parse --short $head)..$(git rev-parse --short $1)" |
350 | git update-index --refresh 2>/dev/null | |
be242d57 BF |
351 | msg="Fast forward" |
352 | if test -n "$have_message" | |
353 | then | |
354 | msg="$msg (no commit created; -m option ignored)" | |
355 | fi | |
5be60078 JH |
356 | new_head=$(git rev-parse --verify "$1^0") && |
357 | git read-tree -v -m -u --exclude-per-directory=.gitignore $head "$new_head" && | |
be242d57 | 358 | finish "$new_head" "$msg" || exit |
a9358240 | 359 | dropsave |
91063bbc JH |
360 | exit 0 |
361 | ;; | |
6ea23343 | 362 | ?,1,?*"$LF"?*,*) |
91063bbc JH |
363 | # We are not doing octopus and not fast forward. Need a |
364 | # real merge. | |
365 | ;; | |
6ea23343 | 366 | ?,1,*,) |
f9d72413 | 367 | # We are not doing octopus, not fast forward, and have only |
c82d7117 | 368 | # one common. |
5be60078 | 369 | git update-index --refresh 2>/dev/null |
a0050852 JH |
370 | case "$allow_trivial_merge" in |
371 | t) | |
c82d7117 SP |
372 | # See if it is really trivial. |
373 | git var GIT_COMMITTER_IDENT >/dev/null || exit | |
374 | echo "Trying really trivial in-index merge..." | |
5be60078 JH |
375 | if git read-tree --trivial -m -u -v $common $head "$1" && |
376 | result_tree=$(git write-tree) | |
c82d7117 SP |
377 | then |
378 | echo "Wonderful." | |
379 | result_commit=$( | |
a23bfaed | 380 | printf '%s\n' "$merge_msg" | |
5be60078 | 381 | git commit-tree $result_tree -p HEAD -p "$1" |
c82d7117 SP |
382 | ) || exit |
383 | finish "$result_commit" "In-index merge" | |
384 | dropsave | |
385 | exit 0 | |
386 | fi | |
387 | echo "Nope." | |
388 | esac | |
f9d72413 | 389 | ;; |
91063bbc JH |
390 | *) |
391 | # An octopus. If we can reach all the remote we are up to date. | |
392 | up_to_date=t | |
393 | for remote | |
394 | do | |
5be60078 | 395 | common_one=$(git merge-base --all $head $remote) |
91063bbc JH |
396 | if test "$common_one" != "$remote" |
397 | then | |
398 | up_to_date=f | |
399 | break | |
400 | fi | |
401 | done | |
402 | if test "$up_to_date" = t | |
403 | then | |
7d0c6887 | 404 | finish_up_to_date "Already up-to-date. Yeeah!" |
91063bbc JH |
405 | exit 0 |
406 | fi | |
407 | ;; | |
408 | esac | |
409 | ||
e3b59a44 JH |
410 | # We are going to make a new commit. |
411 | git var GIT_COMMITTER_IDENT >/dev/null || exit | |
412 | ||
a9358240 JH |
413 | # At this point, we need a real merge. No matter what strategy |
414 | # we use, it would operate on the index, possibly affecting the | |
415 | # working tree, and when resolved cleanly, have the desired tree | |
416 | # in the index -- this means that the index must be in sync with | |
60fa0560 | 417 | # the $head commit. The strategies are responsible to ensure this. |
91063bbc | 418 | |
a9358240 JH |
419 | case "$use_strategies" in |
420 | ?*' '?*) | |
421 | # Stash away the local changes so that we can try more than one. | |
422 | savestate | |
423 | single_strategy=no | |
424 | ;; | |
425 | *) | |
a64d7784 | 426 | rm -f "$GIT_DIR/MERGE_STASH" |
a9358240 JH |
427 | single_strategy=yes |
428 | ;; | |
429 | esac | |
91063bbc JH |
430 | |
431 | result_tree= best_cnt=-1 best_strategy= wt_strategy= | |
695bf722 | 432 | merge_was_ok= |
91063bbc JH |
433 | for strategy in $use_strategies |
434 | do | |
435 | test "$wt_strategy" = '' || { | |
436 | echo "Rewinding the tree to pristine..." | |
a9358240 | 437 | restorestate |
91063bbc | 438 | } |
a9358240 JH |
439 | case "$single_strategy" in |
440 | no) | |
441 | echo "Trying merge strategy $strategy..." | |
442 | ;; | |
443 | esac | |
444 | ||
445 | # Remember which strategy left the state in the working tree | |
91063bbc | 446 | wt_strategy=$strategy |
a9358240 | 447 | |
123ee3ca JH |
448 | git-merge-$strategy $common -- "$head_arg" "$@" |
449 | exit=$? | |
450 | if test "$no_commit" = t && test "$exit" = 0 | |
451 | then | |
695bf722 | 452 | merge_was_ok=t |
123ee3ca JH |
453 | exit=1 ;# pretend it left conflicts. |
454 | fi | |
455 | ||
456 | test "$exit" = 0 || { | |
91063bbc JH |
457 | |
458 | # The backend exits with 1 when conflicts are left to be resolved, | |
459 | # with 2 when it does not handle the given merge at all. | |
460 | ||
91063bbc JH |
461 | if test "$exit" -eq 1 |
462 | then | |
463 | cnt=`{ | |
5be60078 JH |
464 | git diff-files --name-only |
465 | git ls-files --unmerged | |
91063bbc JH |
466 | } | wc -l` |
467 | if test $best_cnt -le 0 -o $cnt -le $best_cnt | |
468 | then | |
469 | best_strategy=$strategy | |
470 | best_cnt=$cnt | |
471 | fi | |
472 | fi | |
473 | continue | |
474 | } | |
475 | ||
476 | # Automerge succeeded. | |
5be60078 | 477 | result_tree=$(git write-tree) && break |
91063bbc JH |
478 | done |
479 | ||
480 | # If we have a resulting tree, that means the strategy module | |
481 | # auto resolved the merge cleanly. | |
482 | if test '' != "$result_tree" | |
483 | then | |
d66424c4 LH |
484 | if test "$allow_fast_forward" = "t" |
485 | then | |
486 | parents=$(git show-branch --independent "$head" "$@") | |
487 | else | |
488 | parents=$(git rev-parse "$head" "$@") | |
489 | fi | |
490 | parents=$(echo "$parents" | sed -e 's/^/-p /') | |
5be60078 | 491 | result_commit=$(printf '%s\n' "$merge_msg" | git commit-tree $result_tree $parents) || exit |
e1447e38 | 492 | finish "$result_commit" "Merge made by $wt_strategy." |
a9358240 | 493 | dropsave |
91063bbc JH |
494 | exit 0 |
495 | fi | |
496 | ||
497 | # Pick the result from the best strategy and have the user fix it up. | |
498 | case "$best_strategy" in | |
499 | '') | |
a9358240 | 500 | restorestate |
0c4e95d0 JH |
501 | case "$use_strategies" in |
502 | ?*' '?*) | |
503 | echo >&2 "No merge strategy handled the merge." | |
504 | ;; | |
505 | *) | |
506 | echo >&2 "Merge with strategy $use_strategies failed." | |
507 | ;; | |
508 | esac | |
4275df51 | 509 | exit 2 |
91063bbc JH |
510 | ;; |
511 | "$wt_strategy") | |
512 | # We already have its result in the working tree. | |
513 | ;; | |
514 | *) | |
515 | echo "Rewinding the tree to pristine..." | |
a9358240 | 516 | restorestate |
91063bbc | 517 | echo "Using the $best_strategy to prepare resolving by hand." |
a9358240 | 518 | git-merge-$best_strategy $common -- "$head_arg" "$@" |
91063bbc JH |
519 | ;; |
520 | esac | |
7d0c6887 JH |
521 | |
522 | if test "$squash" = t | |
523 | then | |
524 | finish | |
525 | else | |
526 | for remote | |
527 | do | |
528 | echo $remote | |
529 | done >"$GIT_DIR/MERGE_HEAD" | |
a23bfaed | 530 | printf '%s\n' "$merge_msg" >"$GIT_DIR/MERGE_MSG" |
7d0c6887 | 531 | fi |
deca7e8c | 532 | |
695bf722 JH |
533 | if test "$merge_was_ok" = t |
534 | then | |
535 | echo >&2 \ | |
536 | "Automatic merge went well; stopped before committing as requested" | |
537 | exit 0 | |
538 | else | |
6b94f1e4 JH |
539 | { |
540 | echo ' | |
541 | Conflicts: | |
542 | ' | |
543 | git ls-files --unmerged | | |
544 | sed -e 's/^[^ ]* / /' | | |
545 | uniq | |
546 | } >>"$GIT_DIR/MERGE_MSG" | |
b4372ef1 | 547 | git rerere |
50ac7408 | 548 | die "Automatic merge failed; fix conflicts and then commit the result." |
695bf722 | 549 | fi |