# Copyright (c) 2005 Junio C Hamano
#
-. git-sh-setup || die "Not a git archive"
+USAGE='[-n] [--summary] [--no-commit] [--squash] [-s <strategy>] [-m=<merge-message>] <commit>+'
-LF='
-'
+SUBDIRECTORY_OK=Yes
+. git-sh-setup
+require_work_tree
+cd_to_toplevel
-usage () {
- die "git-merge [-n] [-s <strategy>]... <merge-message> <head> <remote>+"
-}
+test -z "$(git ls-files -u)" ||
+ die "You are in the middle of a conflicted merge."
-# all_strategies='resolve recursive stupid octopus'
+LF='
+'
-all_strategies='recursive octopus resolve stupid'
-default_strategies='resolve octopus'
+all_strategies='recur recursive octopus resolve stupid ours subtree'
+default_twohead_strategies='recursive'
+default_octopus_strategies='octopus'
+no_trivial_merge_strategies='ours subtree'
use_strategies=
+index_merge=t
+
dropsave() {
- rm -f -- "$GIT_DIR/MERGE_HEAD" \
+ rm -f -- "$GIT_DIR/MERGE_HEAD" "$GIT_DIR/MERGE_MSG" \
"$GIT_DIR/MERGE_SAVE" || exit 1
}
savestate() {
- git diff -r -z --name-only $head | cpio -0 -o >"$GIR_DIR/MERGE_SAVE"
+ # Stash away any local modifications.
+ git-diff-index -z --name-only $head |
+ cpio -0 -o >"$GIT_DIR/MERGE_SAVE"
}
restorestate() {
- git reset --hard $head
- cpio -iuv <"$GIT_DIR/MERGE_SAVE"
- git-update-index --refresh >/dev/null
+ 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 "$1" ;;
+ esac
+ dropsave
}
-summary() {
- case "$no_summary" in
+squash_message () {
+ echo Squashed commit of the following:
+ echo
+ git-log --no-merges ^"$head" $remote
+}
+
+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"
+ ;;
'')
- git-diff-tree -p -M $head "$1" |
- git-apply --stat --summary
+ case "$merge_msg" in
+ '')
+ echo "No merge message -- not updating HEAD"
+ ;;
+ *)
+ git-update-ref -m "$rlogm" HEAD "$1" "$head" || exit 1
+ ;;
+ esac
+ ;;
+ esac
+ case "$1" in
+ '')
+ ;;
+ ?*)
+ if test "$show_diffstat" = t
+ then
+ # We want color (if set), but no pager
+ GIT_PAGER='' git-diff --stat --summary -M "$head" "$1"
+ fi
;;
esac
}
+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 '$remote'"
+ fi
+}
+
+case "$#" in 0) usage ;; esac
+
+have_message=
while case "$#" in 0) break ;; esac
do
case "$1" in
-n|--n|--no|--no-|--no-s|--no-su|--no-sum|--no-summ|\
--no-summa|--no-summar|--no-summary)
- no_summary=t ;;
+ show_diffstat=false ;;
+ --summary)
+ show_diffstat=t ;;
+ --sq|--squ|--squa|--squas|--squash)
+ squash=t no_commit=t ;;
+ --no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
+ no_commit=t ;;
-s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
--strateg=*|--strategy=*|\
-s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
case "$#,$1" in
*,*=*)
- strategy=`expr "$1" : '-[^=]*=\(.*\)'` ;;
+ strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
1,*)
usage ;;
*)
die "available strategies are: $all_strategies" ;;
esac
;;
+ -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="$1"
+ have_message=t
+ ;;
-*) usage ;;
*) break ;;
esac
shift
done
-case "$use_strategies" in
-'')
- use_strategies=$default_strategies
- ;;
-esac
-test "$#" -le 2 && usage ;# we need at least two heads.
+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
-merge_msg="$1"
-shift
-head_arg="$1"
-head=$(git-rev-parse --verify "$1"^0) || usage
-shift
+else
+ # We are invoked directly as the first-class UI.
+ head_arg=HEAD
+
+ # All the rest are the commits being merged; prepare
+ # the standard merge summary message to be appended to
+ # the given message. If remote is invalid we will die
+ # later in the common codepath so we discard the error
+ # in this loop.
+ merge_name=$(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 $*"
+
+remoteheads=
for remote
do
- git-rev-parse --verify "$remote"^0 >/dev/null ||
+ 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 nt in $no_trivial_merge_strategies
+ do
+ case " $s " in
+ *" $nt "*)
+ index_merge=f
+ break
+ ;;
+ esac
+ done
done
-common=$(git-show-branch --merge-base $head "$@")
+case "$#" in
+1)
+ common=$(git-merge-base --all $head "$@")
+ ;;
+*)
+ common=$(git-show-branch --merge-base $head "$@")
+ ;;
+esac
echo "$head" >"$GIT_DIR/ORIG_HEAD"
-case "$#,$common" in
-*,'')
- die "Unable to find common commit between $head_arg and $*"
+case "$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,"$1",*)
# If head can reach all the merge then we are up to date.
- # but first the most common case of merging one remote
- echo "Already up-to-date. Yeeah!"
- dropsave
+ # but first the most common case of merging one remote.
+ finish_up_to_date "Already up-to-date."
exit 0
;;
-1,"$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
- git-read-tree -u -m $head "$1" || exit 1
- git-rev-parse --verify "$1^0" > "$GIT_DIR/HEAD"
- summary "$1"
+ msg="Fast forward"
+ if test -n "$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,*)
+?,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 " $use_strategies " in
+ *' recursive '*|*' recur '*)
+ : run merge later
+ ;;
+ *)
+ # 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 $head $remote)
+ common_one=$(git-merge-base --all $head $remote)
if test "$common_one" != "$remote"
then
up_to_date=f
done
if test "$up_to_date" = t
then
- echo "Already up-to-date. Yeeah!"
- dropsave
+ finish_up_to_date "Already up-to-date. Yeeah!"
exit 0
fi
;;
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 $head commit.
-files=$(git-diff-index --cached --name-only $head) || exit
-if [ "$files" ]; then
- echo >&2 "Dirty index: cannot merge (dirty: $files)"
- exit 1
-fi
+# the $head commit. The strategies are responsible to ensure this.
case "$use_strategies" in
?*' '?*)
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" = '' || {
# Remember which strategy left the state in the working tree
wt_strategy=$strategy
- git-merge-$strategy $common -- "$head_arg" "$@" || {
+ git-merge-$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 "$exit" = 0 || {
# The backend exits with 1 when conflicts are left to be resolved,
# with 2 when it does not handle the given merge at all.
- exit=$?
if test "$exit" -eq 1
then
cnt=`{
# auto resolved the merge cleanly.
if test '' != "$result_tree"
then
- parents="-p $head"
- for remote
- do
- parents="$parents -p $remote"
- done
- result_commit=$(echo "$merge_msg" | git-commit-tree $result_tree $parents)
- echo "Committed merge $result_commit, made by $wt_strategy."
- echo $result_commit >"$GIT_DIR/HEAD"
- summary $result_commit
+ parents=$(git-show-branch --independent "$head" "$@" | sed -e 's/^/-p /')
+ result_commit=$(printf '%s\n' "$merge_msg" | git-commit-tree $result_tree $parents) || exit
+ finish "$result_commit" "Merge made by $wt_strategy."
dropsave
exit 0
fi
case "$best_strategy" in
'')
restorestate
- die "No merge strategy handled the merge."
+ 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.
git-merge-$best_strategy $common -- "$head_arg" "$@"
;;
esac
-for remote
-do
- echo $remote
-done >"$GIT_DIR/MERGE_HEAD"
-die "Automatic merge failed; fix up by hand"
+
+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"
+ if test -d "$GIT_DIR/rr-cache"
+ then
+ git-rerere
+ fi
+ die "Automatic merge failed; fix conflicts and then commit the result."
+fi