9225d7be0a
The following patch will introduce a new configuration variable, "format.pretty", from then on the pretty format without specifying "--pretty" might not be the default "--pretty=medium", it depends on the user's config. So all kinds of Shell/Perl/Emacs scripts that needs the default medium pretty format must specify it explicitly. Signed-off-by: Denis Cheng <crquan@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
550 lines
12 KiB
Bash
Executable File
550 lines
12 KiB
Bash
Executable File
#!/bin/sh
|
|
#
|
|
# Copyright (c) 2005 Junio C Hamano
|
|
#
|
|
|
|
OPTIONS_KEEPDASHDASH=
|
|
OPTIONS_SPEC="\
|
|
git-merge [options] <remote>...
|
|
git-merge [options] <msg> HEAD <remote>
|
|
--
|
|
summary show a diffstat at the end of the merge
|
|
n,no-summary don't show a diffstat at the end of the merge
|
|
squash create a single commit instead of doing a merge
|
|
commit perform a commit if the merge sucesses (default)
|
|
ff allow fast forward (default)
|
|
s,strategy= merge strategy to use
|
|
m,message= message to be used for the merge commit (if any)
|
|
"
|
|
|
|
SUBDIRECTORY_OK=Yes
|
|
. git-sh-setup
|
|
require_work_tree
|
|
cd_to_toplevel
|
|
|
|
test -z "$(git ls-files -u)" ||
|
|
die "You are in the middle of a conflicted merge."
|
|
|
|
LF='
|
|
'
|
|
|
|
all_strategies='recur recursive octopus resolve stupid ours subtree'
|
|
default_twohead_strategies='recursive'
|
|
default_octopus_strategies='octopus'
|
|
no_fast_forward_strategies='subtree ours'
|
|
no_trivial_strategies='recursive recur subtree ours'
|
|
use_strategies=
|
|
|
|
allow_fast_forward=t
|
|
allow_trivial_merge=t
|
|
squash= no_commit=
|
|
|
|
dropsave() {
|
|
rm -f -- "$GIT_DIR/MERGE_HEAD" "$GIT_DIR/MERGE_MSG" \
|
|
"$GIT_DIR/MERGE_STASH" || exit 1
|
|
}
|
|
|
|
savestate() {
|
|
# Stash away any local modifications.
|
|
git stash create >"$GIT_DIR/MERGE_STASH"
|
|
}
|
|
|
|
restorestate() {
|
|
if test -f "$GIT_DIR/MERGE_STASH"
|
|
then
|
|
git reset --hard $head >/dev/null
|
|
git stash apply $(cat "$GIT_DIR/MERGE_STASH")
|
|
git update-index --refresh >/dev/null
|
|
fi
|
|
}
|
|
|
|
finish_up_to_date () {
|
|
case "$squash" in
|
|
t)
|
|
echo "$1 (nothing to squash)" ;;
|
|
'')
|
|
echo "$1" ;;
|
|
esac
|
|
dropsave
|
|
}
|
|
|
|
squash_message () {
|
|
echo Squashed commit of the following:
|
|
echo
|
|
git log --no-merges --pretty=medium ^"$head" $remoteheads
|
|
}
|
|
|
|
finish () {
|
|
if test '' = "$2"
|
|
then
|
|
rlogm="$GIT_REFLOG_ACTION"
|
|
else
|
|
echo "$2"
|
|
rlogm="$GIT_REFLOG_ACTION: $2"
|
|
fi
|
|
case "$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
|
|
git gc --auto
|
|
;;
|
|
esac
|
|
;;
|
|
esac
|
|
case "$1" in
|
|
'')
|
|
;;
|
|
?*)
|
|
if test "$show_diffstat" = t
|
|
then
|
|
# We want color (if set), but no pager
|
|
GIT_PAGER='' git diff --stat --summary -M "$head" "$1"
|
|
fi
|
|
;;
|
|
esac
|
|
|
|
# Run a post-merge hook
|
|
if test -x "$GIT_DIR"/hooks/post-merge
|
|
then
|
|
case "$squash" in
|
|
t)
|
|
"$GIT_DIR"/hooks/post-merge 1
|
|
;;
|
|
'')
|
|
"$GIT_DIR"/hooks/post-merge 0
|
|
;;
|
|
esac
|
|
fi
|
|
}
|
|
|
|
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 ."
|
|
elif test "$remote" = "FETCH_HEAD" -a -r "$GIT_DIR/FETCH_HEAD"
|
|
then
|
|
sed -e 's/ not-for-merge / /' -e 1q \
|
|
"$GIT_DIR/FETCH_HEAD"
|
|
else
|
|
echo "$rh commit '$remote'"
|
|
fi
|
|
}
|
|
|
|
parse_config () {
|
|
while test $# != 0; do
|
|
case "$1" in
|
|
-n|--no-summary)
|
|
show_diffstat=false ;;
|
|
--summary)
|
|
show_diffstat=t ;;
|
|
--squash)
|
|
test "$allow_fast_forward" = t ||
|
|
die "You cannot combine --squash with --no-ff."
|
|
squash=t no_commit=t ;;
|
|
--no-squash)
|
|
squash= no_commit= ;;
|
|
--commit)
|
|
no_commit= ;;
|
|
--no-commit)
|
|
no_commit=t ;;
|
|
--ff)
|
|
allow_fast_forward=t ;;
|
|
--no-ff)
|
|
test "$squash" != t ||
|
|
die "You cannot combine --squash with --no-ff."
|
|
allow_fast_forward=f ;;
|
|
-s|--strategy)
|
|
shift
|
|
case " $all_strategies " in
|
|
*" $1 "*)
|
|
use_strategies="$use_strategies$1 " ;;
|
|
*)
|
|
die "available strategies are: $all_strategies" ;;
|
|
esac
|
|
;;
|
|
-m|--message)
|
|
shift
|
|
merge_msg="$1"
|
|
have_message=t
|
|
;;
|
|
--)
|
|
shift
|
|
break ;;
|
|
*) usage ;;
|
|
esac
|
|
shift
|
|
done
|
|
args_left=$#
|
|
}
|
|
|
|
test $# != 0 || usage
|
|
|
|
have_message=
|
|
|
|
if branch=$(git-symbolic-ref -q HEAD)
|
|
then
|
|
mergeopts=$(git config "branch.${branch#refs/heads/}.mergeoptions")
|
|
if test -n "$mergeopts"
|
|
then
|
|
parse_config $mergeopts --
|
|
fi
|
|
fi
|
|
|
|
parse_config "$@"
|
|
while test $args_left -lt $#; do shift; done
|
|
|
|
if test -z "$show_diffstat"; then
|
|
test "$(git config --bool merge.diffstat)" = false && show_diffstat=false
|
|
test -z "$show_diffstat" && show_diffstat=t
|
|
fi
|
|
|
|
# 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.
|
|
set_reflog_action "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 "$#" in
|
|
1)
|
|
var="`git config --get pull.twohead`"
|
|
if test -n "$var"
|
|
then
|
|
use_strategies="$var"
|
|
else
|
|
use_strategies="$default_twohead_strategies"
|
|
fi ;;
|
|
*)
|
|
var="`git config --get pull.octopus`"
|
|
if test -n "$var"
|
|
then
|
|
use_strategies="$var"
|
|
else
|
|
use_strategies="$default_octopus_strategies"
|
|
fi ;;
|
|
esac
|
|
;;
|
|
esac
|
|
|
|
for s in $use_strategies
|
|
do
|
|
for ss in $no_fast_forward_strategies
|
|
do
|
|
case " $s " in
|
|
*" $ss "*)
|
|
allow_fast_forward=f
|
|
break
|
|
;;
|
|
esac
|
|
done
|
|
for ss in $no_trivial_strategies
|
|
do
|
|
case " $s " in
|
|
*" $ss "*)
|
|
allow_trivial_merge=f
|
|
break
|
|
;;
|
|
esac
|
|
done
|
|
done
|
|
|
|
case "$#" in
|
|
1)
|
|
common=$(git merge-base --all $head "$@")
|
|
;;
|
|
*)
|
|
common=$(git show-branch --merge-base $head "$@")
|
|
;;
|
|
esac
|
|
echo "$head" >"$GIT_DIR/ORIG_HEAD"
|
|
|
|
case "$allow_fast_forward,$#,$common,$no_commit" in
|
|
?,*,'',*)
|
|
# No common ancestors found. We need a real merge.
|
|
;;
|
|
?,1,"$1",*)
|
|
# If head can reach all the merge then we are up to date.
|
|
# but first the most common case of merging one remote.
|
|
finish_up_to_date "Already up-to-date."
|
|
exit 0
|
|
;;
|
|
t,1,"$head",*)
|
|
# Again the most common case of merging one remote.
|
|
echo "Updating $(git rev-parse --short $head)..$(git rev-parse --short $1)"
|
|
git update-index --refresh 2>/dev/null
|
|
msg="Fast forward"
|
|
if test -n "$have_message"
|
|
then
|
|
msg="$msg (no commit created; -m option ignored)"
|
|
fi
|
|
new_head=$(git rev-parse --verify "$1^0") &&
|
|
git read-tree -v -m -u --exclude-per-directory=.gitignore $head "$new_head" &&
|
|
finish "$new_head" "$msg" || exit
|
|
dropsave
|
|
exit 0
|
|
;;
|
|
?,1,?*"$LF"?*,*)
|
|
# We are not doing octopus and not fast forward. Need a
|
|
# real merge.
|
|
;;
|
|
?,1,*,)
|
|
# We are not doing octopus, not fast forward, and have only
|
|
# one common.
|
|
git update-index --refresh 2>/dev/null
|
|
case "$allow_trivial_merge" in
|
|
t)
|
|
# See if it is really trivial.
|
|
git var GIT_COMMITTER_IDENT >/dev/null || exit
|
|
echo "Trying really trivial in-index merge..."
|
|
if git read-tree --trivial -m -u -v $common $head "$1" &&
|
|
result_tree=$(git write-tree)
|
|
then
|
|
echo "Wonderful."
|
|
result_commit=$(
|
|
printf '%s\n' "$merge_msg" |
|
|
git commit-tree $result_tree -p HEAD -p "$1"
|
|
) || exit
|
|
finish "$result_commit" "In-index merge"
|
|
dropsave
|
|
exit 0
|
|
fi
|
|
echo "Nope."
|
|
esac
|
|
;;
|
|
*)
|
|
# 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_STASH"
|
|
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 '' != "$result_tree"
|
|
then
|
|
if test "$allow_fast_forward" = "t"
|
|
then
|
|
parents=$(git show-branch --independent "$head" "$@")
|
|
else
|
|
parents=$(git rev-parse "$head" "$@")
|
|
fi
|
|
parents=$(echo "$parents" | sed -e 's/^/-p /')
|
|
result_commit=$(printf '%s\n' "$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"
|
|
printf '%s\n' "$merge_msg" >"$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"
|
|
git rerere
|
|
die "Automatic merge failed; fix conflicts and then commit the result."
|
|
fi
|