3 # Copyright (c) 2005 Junio C Hamano
6 USAGE
='[-n] [--summary] [--no-commit] [--squash] [-s <strategy>] [-m=<merge-message>] <commit>+'
13 test -z "$(git ls-files -u)" ||
14 die
"You are in the middle of a conflicted merge."
19 all_strategies
='recur recursive octopus resolve stupid ours subtree'
20 default_twohead_strategies
='recursive'
21 default_octopus_strategies
='octopus'
22 no_fast_forward_strategies
='subtree ours'
23 no_trivial_strategies
='recursive recur subtree ours'
30 rm -f -- "$GIT_DIR/MERGE_HEAD" "$GIT_DIR/MERGE_MSG" \
31 "$GIT_DIR/MERGE_SAVE" ||
exit 1
35 # Stash away any local modifications.
36 git diff-index
-z --name-only $head |
37 cpio -0 -o >"$GIT_DIR/MERGE_SAVE"
41 if test -f "$GIT_DIR/MERGE_SAVE"
43 git
reset --hard $head >/dev
/null
44 cpio -iuv <"$GIT_DIR/MERGE_SAVE"
45 git update-index
--refresh >/dev
/null
49 finish_up_to_date
() {
52 echo "$1 (nothing to squash)" ;;
60 echo Squashed commit of the following
:
62 git log
--no-merges ^
"$head" $remote
68 rlogm
="$GIT_REFLOG_ACTION"
71 rlogm
="$GIT_REFLOG_ACTION: $2"
75 echo "Squash commit -- not updating HEAD"
76 squash_message
>"$GIT_DIR/SQUASH_MSG"
81 echo "No merge message -- not updating HEAD"
84 git update-ref
-m "$rlogm" HEAD
"$1" "$head" ||
exit 1
94 if test "$show_diffstat" = t
96 # We want color (if set), but no pager
97 GIT_PAGER
='' git
diff --stat --summary -M "$head" "$1"
102 # Run a post-merge hook
103 if test -x "$GIT_DIR"/hooks
/post-merge
107 "$GIT_DIR"/hooks
/post-merge
1
110 "$GIT_DIR"/hooks
/post-merge
0
118 rh
=$
(git rev-parse
--verify "$remote^0" 2>/dev
/null
) ||
return
119 bh
=$
(git show-ref
-s --verify "refs/heads/$remote" 2>/dev
/null
)
120 if test "$rh" = "$bh"
122 echo "$rh branch '$remote' of ."
123 elif truname
=$
(expr "$remote" : '\(.*\)~[1-9][0-9]*$') &&
124 git show-ref
-q --verify "refs/heads/$truname" 2>/dev
/null
126 echo "$rh branch '$truname' (early part) of ."
127 elif test "$remote" = "FETCH_HEAD" -a -r "$GIT_DIR/FETCH_HEAD"
129 sed -e 's/ not-for-merge / /' -e 1q \
130 "$GIT_DIR/FETCH_HEAD"
132 echo "$rh commit '$remote'"
136 case "$#" in 0) usage
;; esac
142 -n|
--n|
--no|
--no-|
--no-s|
--no-su|
--no-sum|
--no-summ|\
143 --no-summa|
--no-summar|
--no-summary)
144 show_diffstat
=false
;;
147 --sq|
--squ|
--squa|
--squas|
--squash)
148 squash
=t no_commit
=t
;;
149 --no-c|
--no-co|
--no-com|
--no-comm|
--no-commi|
--no-commit)
151 -s=*|
--s=*|
--st=*|
--str=*|
--stra=*|
--strat=*|
--strate=*|\
152 --strateg=*|
--strategy=*|\
153 -s|
--s|
--st|
--str|
--stra|
--strat|
--strate|
--strateg|
--strategy)
156 strategy
=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
163 case " $all_strategies " in
165 use_strategies
="$use_strategies$strategy " ;;
167 die
"available strategies are: $all_strategies" ;;
170 -m=*|
--m=*|
--me=*|
--mes=*|
--mess=*|
--messa=*|
--messag=*|
--message=*)
171 merge_msg
=`expr "z$1" : 'z-[^=]*=\(.*\)'`
174 -m|
--m|
--me|
--mes|
--mess|
--messa|
--messag|
--message)
188 if test -z "$show_diffstat"; then
189 test "$(git config --bool merge.diffstat)" = false
&& show_diffstat
=false
190 test -z "$show_diffstat" && show_diffstat
=t
193 # This could be traditional "merge <msg> HEAD <commit>..." and the
194 # way we can tell it is to see if the second token is HEAD, but some
195 # people might have misused the interface and used a committish that
196 # is the same as HEAD there instead. Traditional format never would
197 # have "-m" so it is an additional safety measure to check for it.
199 if test -z "$have_message" &&
200 second_token
=$
(git rev-parse
--verify "$2^0" 2>/dev
/null
) &&
201 head_commit
=$
(git rev-parse
--verify "HEAD" 2>/dev
/null
) &&
202 test "$second_token" = "$head_commit"
208 elif ! git rev-parse
--verify HEAD
>/dev
/null
2>&1
210 # If the merged head is a valid one there is no reason to
211 # forbid "git merge" into a branch yet to be born. We do
212 # the same for "git pull".
215 echo >&2 "Can merge only exactly one commit into empty head"
219 rh
=$
(git rev-parse
--verify "$1^0") ||
220 die
"$1 - not something we can merge"
222 git update-ref
-m "initial pull" HEAD
"$rh" "" &&
223 git read-tree
--reset -u HEAD
227 # We are invoked directly as the first-class UI.
230 # All the rest are the commits being merged; prepare
231 # the standard merge summary message to be appended to
232 # the given message. If remote is invalid we will die
233 # later in the common codepath so we discard the error
235 merge_name
=$
(for remote
238 done | git fmt-merge-msg
240 merge_msg
="${merge_msg:+$merge_msg$LF$LF}$merge_name"
242 head=$
(git rev-parse
--verify "$head_arg"^
0) || usage
244 # All the rest are remote heads
245 test "$#" = 0 && usage
;# we need at least one remote head.
246 set_reflog_action
"merge $*"
251 remotehead
=$
(git rev-parse
--verify "$remote"^
0 2>/dev
/null
) ||
252 die
"$remote - not something we can merge"
253 remoteheads
="${remoteheads}$remotehead "
254 eval GITHEAD_
$remotehead='"$remote"'
255 export GITHEAD_
$remotehead
257 set x
$remoteheads ; shift
259 case "$use_strategies" in
263 var
="`git config --get pull.twohead`"
266 use_strategies
="$var"
268 use_strategies
="$default_twohead_strategies"
271 var
="`git config --get pull.octopus`"
274 use_strategies
="$var"
276 use_strategies
="$default_octopus_strategies"
282 for s
in $use_strategies
284 for ss
in $no_fast_forward_strategies
293 for ss
in $no_trivial_strategies
297 allow_trivial_merge
=f
306 common
=$
(git merge-base
--all $head "$@")
309 common
=$
(git show-branch
--merge-base $head "$@")
312 echo "$head" >"$GIT_DIR/ORIG_HEAD"
314 case "$allow_fast_forward,$#,$common,$no_commit" in
316 # No common ancestors found. We need a real merge.
319 # If head can reach all the merge then we are up to date.
320 # but first the most common case of merging one remote.
321 finish_up_to_date
"Already up-to-date."
325 # Again the most common case of merging one remote.
326 echo "Updating $(git rev-parse --short $head)..$(git rev-parse --short $1)"
327 git update-index
--refresh 2>/dev
/null
329 if test -n "$have_message"
331 msg
="$msg (no commit created; -m option ignored)"
333 new_head
=$
(git rev-parse
--verify "$1^0") &&
334 git read-tree
-v -m -u --exclude-per-directory=.gitignore
$head "$new_head" &&
335 finish
"$new_head" "$msg" ||
exit
340 # We are not doing octopus and not fast forward. Need a
344 # We are not doing octopus, not fast forward, and have only
346 git update-index
--refresh 2>/dev
/null
347 case "$allow_trivial_merge" in
349 # See if it is really trivial.
350 git var GIT_COMMITTER_IDENT
>/dev
/null ||
exit
351 echo "Trying really trivial in-index merge..."
352 if git read-tree
--trivial -m -u -v $common $head "$1" &&
353 result_tree
=$
(git write-tree
)
357 printf '%s\n' "$merge_msg" |
358 git commit-tree
$result_tree -p HEAD
-p "$1"
360 finish
"$result_commit" "In-index merge"
368 # An octopus. If we can reach all the remote we are up to date.
372 common_one
=$
(git merge-base
--all $head $remote)
373 if test "$common_one" != "$remote"
379 if test "$up_to_date" = t
381 finish_up_to_date
"Already up-to-date. Yeeah!"
387 # We are going to make a new commit.
388 git var GIT_COMMITTER_IDENT
>/dev
/null ||
exit
390 # At this point, we need a real merge. No matter what strategy
391 # we use, it would operate on the index, possibly affecting the
392 # working tree, and when resolved cleanly, have the desired tree
393 # in the index -- this means that the index must be in sync with
394 # the $head commit. The strategies are responsible to ensure this.
396 case "$use_strategies" in
398 # Stash away the local changes so that we can try more than one.
403 rm -f "$GIT_DIR/MERGE_SAVE"
408 result_tree
= best_cnt
=-1 best_strategy
= wt_strategy
=
410 for strategy
in $use_strategies
412 test "$wt_strategy" = '' ||
{
413 echo "Rewinding the tree to pristine..."
416 case "$single_strategy" in
418 echo "Trying merge strategy $strategy..."
422 # Remember which strategy left the state in the working tree
423 wt_strategy
=$strategy
425 git-merge-
$strategy $common -- "$head_arg" "$@"
427 if test "$no_commit" = t
&& test "$exit" = 0
430 exit=1 ;# pretend it left conflicts.
433 test "$exit" = 0 ||
{
435 # The backend exits with 1 when conflicts are left to be resolved,
436 # with 2 when it does not handle the given merge at all.
438 if test "$exit" -eq 1
441 git diff-files --name-only
442 git ls-files --unmerged
444 if test $best_cnt -le 0 -o $cnt -le $best_cnt
446 best_strategy
=$strategy
453 # Automerge succeeded.
454 result_tree
=$
(git write-tree
) && break
457 # If we have a resulting tree, that means the strategy module
458 # auto resolved the merge cleanly.
459 if test '' != "$result_tree"
461 parents
=$
(git show-branch
--independent "$head" "$@" |
sed -e 's/^/-p /')
462 result_commit
=$
(printf '%s\n' "$merge_msg" | git commit-tree
$result_tree $parents) ||
exit
463 finish
"$result_commit" "Merge made by $wt_strategy."
468 # Pick the result from the best strategy and have the user fix it up.
469 case "$best_strategy" in
472 case "$use_strategies" in
474 echo >&2 "No merge strategy handled the merge."
477 echo >&2 "Merge with strategy $use_strategies failed."
483 # We already have its result in the working tree.
486 echo "Rewinding the tree to pristine..."
488 echo "Using the $best_strategy to prepare resolving by hand."
489 git-merge-
$best_strategy $common -- "$head_arg" "$@"
493 if test "$squash" = t
500 done >"$GIT_DIR/MERGE_HEAD"
501 printf '%s\n' "$merge_msg" >"$GIT_DIR/MERGE_MSG"
504 if test "$merge_was_ok" = t
507 "Automatic merge went well; stopped before committing as requested"
514 git ls-files
--unmerged |
515 sed -e 's/^[^ ]* / /' |
517 } >>"$GIT_DIR/MERGE_MSG"
519 die
"Automatic merge failed; fix conflicts and then commit the result."