# Copyright (c) 2005 Junio C Hamano
#
+USAGE='[-n] [--no-commit] [--squash] [-s <strategy>] [--reflog-action=<action>] [-m=<merge-message>] <commit>+'
-USAGE='[-n] [--no-commit] [-s <strategy>]... <merge-message> <head> <remote>+'
. git-sh-setup
LF='
'
-all_strategies='recursive octopus resolve stupid ours'
-default_strategies='recursive'
+all_strategies='recur recursive octopus resolve stupid ours'
+default_twohead_strategies='recursive'
+default_octopus_strategies='octopus'
+no_trivial_merge_strategies='ours'
use_strategies=
-if test "@@NO_PYTHON@@"; then
- all_strategies='resolve octopus stupid ours'
- default_strategies='resolve'
-fi
+
+index_merge=t
dropsave() {
rm -f -- "$GIT_DIR/MERGE_HEAD" "$GIT_DIR/MERGE_MSG" \
fi
}
-finish () {
- test '' = "$2" || echo "$2"
- case "$merge_msg" in
+finish_up_to_date () {
+ case "$squash" in
+ t)
+ echo "$1 (nothing to squash)" ;;
'')
- echo "No merge message -- not updating HEAD"
+ 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"
;;
- *)
- git-update-ref HEAD "$1" "$head" || exit 1
+ '')
+ case "$merge_msg" in
+ '')
+ echo "No merge message -- not updating HEAD"
+ ;;
+ *)
+ git-update-ref -m "$rlogm" HEAD "$1" "$head" || exit 1
+ ;;
+ esac
;;
esac
-
- case "$no_summary" in
+ case "$1" in
'')
- git-diff-tree -p -M "$head" "$1" |
- git-apply --stat --summary
+ ;;
+ ?*)
+ case "$no_summary" in
+ '')
+ git-diff-tree --stat --summary -M "$head" "$1"
+ ;;
+ esac
;;
esac
}
+case "$#" in 0) usage ;; esac
+
+rloga= have_message=
while case "$#" in 0) break ;; esac
do
case "$1" in
-n|--n|--no|--no-|--no-s|--no-su|--no-sum|--no-summ|\
--no-summa|--no-summar|--no-summary)
no_summary=t ;;
+ --sq|--squ|--squa|--squas|--squash)
+ squash=t no_commit=t ;;
--no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
no_commit=t ;;
-s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
-s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
case "$#,$1" in
*,*=*)
- strategy=`expr "$1" : '-[^=]*=\(.*\)'` ;;
+ strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
1,*)
usage ;;
*)
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="$1"
+ have_message=t
+ ;;
-*) usage ;;
*) break ;;
esac
shift
done
-test "$#" -le 2 && usage ;# we need at least two heads.
+# 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
-merge_msg="$1"
-shift
-head_arg="$1"
-head=$(git-rev-parse --verify "$1"^0) || usage
-shift
+ # All the rest are the commits being merged; prepare
+ # the standard merge summary message to be appended to
+ # the given message. If remote is invalid we will die
+ # later in the common codepath so we discard the error
+ # in this loop.
+ merge_name=$(for remote
+ do
+ rh=$(git-rev-parse --verify "$remote"^0 2>/dev/null) ||
+ continue ;# not something we can merge
+ bh=$(git show-ref -s --verify "refs/heads/$remote" 2>/dev/null)
+ if test "$rh" = "$bh"
+ then
+ echo "$rh branch '$remote' of ."
+ else
+ echo "$rh commit '$remote'"
+ fi
+ 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 "$remote"^0) ||
+ remotehead=$(git-rev-parse --verify "$remote"^0 2>/dev/null) ||
die "$remote - not something we can merge"
remoteheads="${remoteheads}$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 $head "$@")
esac
echo "$head" >"$GIT_DIR/ORIG_HEAD"
-case "$#,$common,$no_commit" in
-*,'',*)
+case "$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",*)
+?,1,"$1",*)
# If head can reach all the merge then we are up to date.
- # but first the most common case of merging one remote
- echo "Already up-to-date."
- dropsave
+ # but first the most common case of merging one remote.
+ finish_up_to_date "Already up-to-date."
exit 0
;;
-1,"$head",*)
+?,1,"$head",*)
# Again the most common case of merging one remote.
- echo "Updating from $head to $1"
+ 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 -u -v -m $head "$new_head" &&
dropsave
exit 0
;;
-1,?*"$LF"?*,*)
+?,1,?*"$LF"?*,*)
# We are not doing octopus and not fast forward. Need a
# real merge.
;;
-1,*,)
+?,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
done
if test "$up_to_date" = t
then
- echo "Already up-to-date. Yeeah!"
- dropsave
+ finish_up_to_date "Already up-to-date. Yeeah!"
exit 0
fi
;;
# We are going to make a new commit.
git var GIT_COMMITTER_IDENT >/dev/null || exit
-case "$use_strategies" in
-'')
- case "$#" in
- 1)
- use_strategies="$default_strategies" ;;
- *)
- use_strategies=octopus ;;
- esac
- ;;
-esac
-
# 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
# auto resolved the merge cleanly.
if test '' != "$result_tree"
then
- parents="-p $head"
- for remote
- do
- parents="$parents -p $remote"
- done
+ parents=$(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 $result_commit, made by $wt_strategy."
+ finish "$result_commit" "Merge made by $wt_strategy."
dropsave
exit 0
fi
git-merge-$best_strategy $common -- "$head_arg" "$@"
;;
esac
-for remote
-do
- echo $remote
-done >"$GIT_DIR/MERGE_HEAD"
-echo "$merge_msg" >"$GIT_DIR/MERGE_MSG"
+
+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
then
git-rerere
fi
- die "Automatic merge failed; fix up by hand"
+ die "Automatic merge failed; fix conflicts and then commit the result."
fi