mirror of
https://github.com/git/git
synced 2024-09-12 21:04:12 +00:00
e0ec18192d
Displaying the SHA1 of 'their' branch (the branch being merged into
the current branch) is not nearly as friendly as just displaying
the name of that branch, especially if that branch is already local
to this repository.
git-merge now sets the environment variable 'GITHEAD_%(sha1)=%(name)'
for each argument it gets passed, making the actual input name that
resolved to the commit '%(sha1)' easily available to the invoked
merge strategy.
git-merge-recursive makes use of these environment variables when
they are available by using '%(name)' whenever it outputs the commit
identification rather than '%(sha1)'. This is most obvious in the
conflict hunks created by xdl_merge:
$ git mege sideb~1
<<<<<<< HEAD:INSTALL
Good!
=======
Oops.
>>>>>>> sideb~1:INSTALL
[jc: adjusted a test script and a minor constness glitch.]
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
465 lines
10 KiB
Bash
Executable file
465 lines
10 KiB
Bash
Executable file
#!/bin/sh
|
|
#
|
|
# Copyright (c) 2005 Junio C Hamano
|
|
#
|
|
|
|
USAGE='[-n] [--no-commit] [--squash] [-s <strategy>] [--reflog-action=<action>] [-m=<merge-message>] <commit>+'
|
|
|
|
. git-sh-setup
|
|
|
|
LF='
|
|
'
|
|
|
|
all_strategies='recur recursive octopus resolve stupid ours'
|
|
default_twohead_strategies='recursive'
|
|
default_octopus_strategies='octopus'
|
|
no_trivial_merge_strategies='ours'
|
|
use_strategies=
|
|
|
|
index_merge=t
|
|
|
|
dropsave() {
|
|
rm -f -- "$GIT_DIR/MERGE_HEAD" "$GIT_DIR/MERGE_MSG" \
|
|
"$GIT_DIR/MERGE_SAVE" || exit 1
|
|
}
|
|
|
|
savestate() {
|
|
# Stash away any local modifications.
|
|
git-diff-index -z --name-only $head |
|
|
cpio -0 -o >"$GIT_DIR/MERGE_SAVE"
|
|
}
|
|
|
|
restorestate() {
|
|
if test -f "$GIT_DIR/MERGE_SAVE"
|
|
then
|
|
git reset --hard $head >/dev/null
|
|
cpio -iuv <"$GIT_DIR/MERGE_SAVE"
|
|
git-update-index --refresh >/dev/null
|
|
fi
|
|
}
|
|
|
|
finish_up_to_date () {
|
|
case "$squash" in
|
|
t)
|
|
echo "$1 (nothing to squash)" ;;
|
|
'')
|
|
echo "$1" ;;
|
|
esac
|
|
dropsave
|
|
}
|
|
|
|
squash_message () {
|
|
echo Squashed commit of the following:
|
|
echo
|
|
git-log --no-merges ^"$head" $remote
|
|
}
|
|
|
|
finish () {
|
|
if test '' = "$2"
|
|
then
|
|
rlogm="$rloga"
|
|
else
|
|
echo "$2"
|
|
rlogm="$rloga: $2"
|
|
fi
|
|
case "$squash" in
|
|
t)
|
|
echo "Squash commit -- not updating HEAD"
|
|
squash_message >"$GIT_DIR/SQUASH_MSG"
|
|
;;
|
|
'')
|
|
case "$merge_msg" in
|
|
'')
|
|
echo "No merge message -- not updating HEAD"
|
|
;;
|
|
*)
|
|
git-update-ref -m "$rlogm" HEAD "$1" "$head" || exit 1
|
|
;;
|
|
esac
|
|
;;
|
|
esac
|
|
case "$1" in
|
|
'')
|
|
;;
|
|
?*)
|
|
case "$no_summary" in
|
|
'')
|
|
git-diff-tree --stat --summary -M "$head" "$1"
|
|
;;
|
|
esac
|
|
;;
|
|
esac
|
|
}
|
|
|
|
merge_name () {
|
|
remote="$1"
|
|
rh=$(git-rev-parse --verify "$remote^0" 2>/dev/null) || return
|
|
bh=$(git-show-ref -s --verify "refs/heads/$remote" 2>/dev/null)
|
|
if test "$rh" = "$bh"
|
|
then
|
|
echo "$rh branch '$remote' of ."
|
|
elif truname=$(expr "$remote" : '\(.*\)~[1-9][0-9]*$') &&
|
|
git-show-ref -q --verify "refs/heads/$truname" 2>/dev/null
|
|
then
|
|
echo "$rh branch '$truname' (early part) of ."
|
|
else
|
|
echo "$rh commit '$remote'"
|
|
fi
|
|
}
|
|
|
|
case "$#" in 0) usage ;; esac
|
|
|
|
rloga= have_message=
|
|
while case "$#" in 0) break ;; esac
|
|
do
|
|
case "$1" in
|
|
-n|--n|--no|--no-|--no-s|--no-su|--no-sum|--no-summ|\
|
|
--no-summa|--no-summar|--no-summary)
|
|
no_summary=t ;;
|
|
--sq|--squ|--squa|--squas|--squash)
|
|
squash=t no_commit=t ;;
|
|
--no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
|
|
no_commit=t ;;
|
|
-s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
|
|
--strateg=*|--strategy=*|\
|
|
-s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
|
|
case "$#,$1" in
|
|
*,*=*)
|
|
strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
|
|
1,*)
|
|
usage ;;
|
|
*)
|
|
strategy="$2"
|
|
shift ;;
|
|
esac
|
|
case " $all_strategies " in
|
|
*" $strategy "*)
|
|
use_strategies="$use_strategies$strategy " ;;
|
|
*)
|
|
die "available strategies are: $all_strategies" ;;
|
|
esac
|
|
;;
|
|
--reflog-action=*)
|
|
rloga=`expr "z$1" : 'z-[^=]*=\(.*\)'`
|
|
;;
|
|
-m=*|--m=*|--me=*|--mes=*|--mess=*|--messa=*|--messag=*|--message=*)
|
|
merge_msg=`expr "z$1" : 'z-[^=]*=\(.*\)'`
|
|
have_message=t
|
|
;;
|
|
-m|--m|--me|--mes|--mess|--messa|--messag|--message)
|
|
shift
|
|
case "$#" in
|
|
1) usage ;;
|
|
esac
|
|
merge_msg="$1"
|
|
have_message=t
|
|
;;
|
|
-*) usage ;;
|
|
*) break ;;
|
|
esac
|
|
shift
|
|
done
|
|
|
|
# This could be traditional "merge <msg> HEAD <commit>..." and the
|
|
# way we can tell it is to see if the second token is HEAD, but some
|
|
# people might have misused the interface and used a committish that
|
|
# is the same as HEAD there instead. Traditional format never would
|
|
# have "-m" so it is an additional safety measure to check for it.
|
|
|
|
if test -z "$have_message" &&
|
|
second_token=$(git-rev-parse --verify "$2^0" 2>/dev/null) &&
|
|
head_commit=$(git-rev-parse --verify "HEAD" 2>/dev/null) &&
|
|
test "$second_token" = "$head_commit"
|
|
then
|
|
merge_msg="$1"
|
|
shift
|
|
head_arg="$1"
|
|
shift
|
|
elif ! git-rev-parse --verify HEAD >/dev/null 2>&1
|
|
then
|
|
# If the merged head is a valid one there is no reason to
|
|
# forbid "git merge" into a branch yet to be born. We do
|
|
# the same for "git pull".
|
|
if test 1 -ne $#
|
|
then
|
|
echo >&2 "Can merge only exactly one commit into empty head"
|
|
exit 1
|
|
fi
|
|
|
|
rh=$(git rev-parse --verify "$1^0") ||
|
|
die "$1 - not something we can merge"
|
|
|
|
git-update-ref -m "initial pull" HEAD "$rh" "" &&
|
|
git-read-tree --reset -u HEAD
|
|
exit
|
|
|
|
else
|
|
# We are invoked directly as the first-class UI.
|
|
head_arg=HEAD
|
|
|
|
# All the rest are the commits being merged; prepare
|
|
# the standard merge summary message to be appended to
|
|
# the given message. If remote is invalid we will die
|
|
# later in the common codepath so we discard the error
|
|
# in this loop.
|
|
merge_name=$(for remote
|
|
do
|
|
merge_name "$remote"
|
|
done | git-fmt-merge-msg
|
|
)
|
|
merge_msg="${merge_msg:+$merge_msg$LF$LF}$merge_name"
|
|
fi
|
|
head=$(git-rev-parse --verify "$head_arg"^0) || usage
|
|
|
|
# All the rest are remote heads
|
|
test "$#" = 0 && usage ;# we need at least one remote head.
|
|
test "$rloga" = '' && rloga="merge: $@"
|
|
|
|
remoteheads=
|
|
for remote
|
|
do
|
|
remotehead=$(git-rev-parse --verify "$remote"^0 2>/dev/null) ||
|
|
die "$remote - not something we can merge"
|
|
remoteheads="${remoteheads}$remotehead "
|
|
eval GITHEAD_$remotehead='"$remote"'
|
|
export GITHEAD_$remotehead
|
|
done
|
|
set x $remoteheads ; shift
|
|
|
|
case "$use_strategies" in
|
|
'')
|
|
case "$#" in
|
|
1)
|
|
use_strategies="$default_twohead_strategies" ;;
|
|
*)
|
|
use_strategies="$default_octopus_strategies" ;;
|
|
esac
|
|
;;
|
|
esac
|
|
|
|
for s in $use_strategies
|
|
do
|
|
case " $s " in
|
|
*" $no_trivial_merge_strategies "*)
|
|
index_merge=f
|
|
break
|
|
;;
|
|
esac
|
|
done
|
|
|
|
case "$#" in
|
|
1)
|
|
common=$(git-merge-base --all $head "$@")
|
|
;;
|
|
*)
|
|
common=$(git-show-branch --merge-base $head "$@")
|
|
;;
|
|
esac
|
|
echo "$head" >"$GIT_DIR/ORIG_HEAD"
|
|
|
|
case "$index_merge,$#,$common,$no_commit" in
|
|
f,*)
|
|
# We've been told not to try anything clever. Skip to real merge.
|
|
;;
|
|
?,*,'',*)
|
|
# No common ancestors found. We need a real merge.
|
|
;;
|
|
?,1,"$1",*)
|
|
# If head can reach all the merge then we are up to date.
|
|
# but first the most common case of merging one remote.
|
|
finish_up_to_date "Already up-to-date."
|
|
exit 0
|
|
;;
|
|
?,1,"$head",*)
|
|
# Again the most common case of merging one remote.
|
|
echo "Updating $(git-rev-parse --short $head)..$(git-rev-parse --short $1)"
|
|
git-update-index --refresh 2>/dev/null
|
|
new_head=$(git-rev-parse --verify "$1^0") &&
|
|
git-read-tree -v -m -u --exclude-per-directory=.gitignore $head "$new_head" &&
|
|
finish "$new_head" "Fast forward"
|
|
dropsave
|
|
exit 0
|
|
;;
|
|
?,1,?*"$LF"?*,*)
|
|
# We are not doing octopus and not fast forward. Need a
|
|
# real merge.
|
|
;;
|
|
?,1,*,)
|
|
# We are not doing octopus, not fast forward, and have only
|
|
# one common. See if it is really trivial.
|
|
git var GIT_COMMITTER_IDENT >/dev/null || exit
|
|
|
|
echo "Trying really trivial in-index merge..."
|
|
git-update-index --refresh 2>/dev/null
|
|
if git-read-tree --trivial -m -u -v $common $head "$1" &&
|
|
result_tree=$(git-write-tree)
|
|
then
|
|
echo "Wonderful."
|
|
result_commit=$(
|
|
echo "$merge_msg" |
|
|
git-commit-tree $result_tree -p HEAD -p "$1"
|
|
) || exit
|
|
finish "$result_commit" "In-index merge"
|
|
dropsave
|
|
exit 0
|
|
fi
|
|
echo "Nope."
|
|
;;
|
|
*)
|
|
# An octopus. If we can reach all the remote we are up to date.
|
|
up_to_date=t
|
|
for remote
|
|
do
|
|
common_one=$(git-merge-base --all $head $remote)
|
|
if test "$common_one" != "$remote"
|
|
then
|
|
up_to_date=f
|
|
break
|
|
fi
|
|
done
|
|
if test "$up_to_date" = t
|
|
then
|
|
finish_up_to_date "Already up-to-date. Yeeah!"
|
|
exit 0
|
|
fi
|
|
;;
|
|
esac
|
|
|
|
# We are going to make a new commit.
|
|
git var GIT_COMMITTER_IDENT >/dev/null || exit
|
|
|
|
# At this point, we need a real merge. No matter what strategy
|
|
# we use, it would operate on the index, possibly affecting the
|
|
# working tree, and when resolved cleanly, have the desired tree
|
|
# in the index -- this means that the index must be in sync with
|
|
# the $head commit. The strategies are responsible to ensure this.
|
|
|
|
case "$use_strategies" in
|
|
?*' '?*)
|
|
# Stash away the local changes so that we can try more than one.
|
|
savestate
|
|
single_strategy=no
|
|
;;
|
|
*)
|
|
rm -f "$GIT_DIR/MERGE_SAVE"
|
|
single_strategy=yes
|
|
;;
|
|
esac
|
|
|
|
result_tree= best_cnt=-1 best_strategy= wt_strategy=
|
|
merge_was_ok=
|
|
for strategy in $use_strategies
|
|
do
|
|
test "$wt_strategy" = '' || {
|
|
echo "Rewinding the tree to pristine..."
|
|
restorestate
|
|
}
|
|
case "$single_strategy" in
|
|
no)
|
|
echo "Trying merge strategy $strategy..."
|
|
;;
|
|
esac
|
|
|
|
# Remember which strategy left the state in the working tree
|
|
wt_strategy=$strategy
|
|
|
|
git-merge-$strategy $common -- "$head_arg" "$@"
|
|
exit=$?
|
|
if test "$no_commit" = t && test "$exit" = 0
|
|
then
|
|
merge_was_ok=t
|
|
exit=1 ;# pretend it left conflicts.
|
|
fi
|
|
|
|
test "$exit" = 0 || {
|
|
|
|
# The backend exits with 1 when conflicts are left to be resolved,
|
|
# with 2 when it does not handle the given merge at all.
|
|
|
|
if test "$exit" -eq 1
|
|
then
|
|
cnt=`{
|
|
git-diff-files --name-only
|
|
git-ls-files --unmerged
|
|
} | wc -l`
|
|
if test $best_cnt -le 0 -o $cnt -le $best_cnt
|
|
then
|
|
best_strategy=$strategy
|
|
best_cnt=$cnt
|
|
fi
|
|
fi
|
|
continue
|
|
}
|
|
|
|
# Automerge succeeded.
|
|
result_tree=$(git-write-tree) && break
|
|
done
|
|
|
|
# If we have a resulting tree, that means the strategy module
|
|
# auto resolved the merge cleanly.
|
|
if test '' != "$result_tree"
|
|
then
|
|
parents=$(git-show-branch --independent "$head" "$@" | sed -e 's/^/-p /')
|
|
result_commit=$(echo "$merge_msg" | git-commit-tree $result_tree $parents) || exit
|
|
finish "$result_commit" "Merge made by $wt_strategy."
|
|
dropsave
|
|
exit 0
|
|
fi
|
|
|
|
# Pick the result from the best strategy and have the user fix it up.
|
|
case "$best_strategy" in
|
|
'')
|
|
restorestate
|
|
case "$use_strategies" in
|
|
?*' '?*)
|
|
echo >&2 "No merge strategy handled the merge."
|
|
;;
|
|
*)
|
|
echo >&2 "Merge with strategy $use_strategies failed."
|
|
;;
|
|
esac
|
|
exit 2
|
|
;;
|
|
"$wt_strategy")
|
|
# We already have its result in the working tree.
|
|
;;
|
|
*)
|
|
echo "Rewinding the tree to pristine..."
|
|
restorestate
|
|
echo "Using the $best_strategy to prepare resolving by hand."
|
|
git-merge-$best_strategy $common -- "$head_arg" "$@"
|
|
;;
|
|
esac
|
|
|
|
if test "$squash" = t
|
|
then
|
|
finish
|
|
else
|
|
for remote
|
|
do
|
|
echo $remote
|
|
done >"$GIT_DIR/MERGE_HEAD"
|
|
echo "$merge_msg" >"$GIT_DIR/MERGE_MSG"
|
|
fi
|
|
|
|
if test "$merge_was_ok" = t
|
|
then
|
|
echo >&2 \
|
|
"Automatic merge went well; stopped before committing as requested"
|
|
exit 0
|
|
else
|
|
{
|
|
echo '
|
|
Conflicts:
|
|
'
|
|
git ls-files --unmerged |
|
|
sed -e 's/^[^ ]* / /' |
|
|
uniq
|
|
} >>"$GIT_DIR/MERGE_MSG"
|
|
if test -d "$GIT_DIR/rr-cache"
|
|
then
|
|
git-rerere
|
|
fi
|
|
die "Automatic merge failed; fix conflicts and then commit the result."
|
|
fi
|