#!/bin/sh
-USAGE='[-f] [-b <new_branch>] [<branch>] [<paths>...]'
+USAGE='[-f] [-b <new_branch>] [
-m] [<branch>] [<paths>...]'
SUBDIRECTORY_OK=Sometimes
. git-sh-setup
force=
branch=
newbranch=
+merge=
while [ "$#" != "0" ]; do
arg="$1"
shift
[ -e "$GIT_DIR/refs/heads/$newbranch" ] &&
die "git checkout: branch $newbranch already exists"
git-check-ref-format "heads/$newbranch" ||
- die "we do not like '$newbranch' as a branch name."
+ die "git checkout: we do not like '$newbranch' as a branch name."
;;
"-f")
force=1
;;
+ -m)
+ merge=1
+ ;;
--)
break
;;
if test "$#" -ge 1
then
- if test '' != "$newbranch$force"
+ hint=
+ if test "$#" -eq 1
+ then
+ hint="
+Did you intend to checkout '$@' which can not be resolved as commit?"
+ fi
+ if test '' != "$newbranch$force$merge"
then
- die "updating paths and switching branches or forcing are incompatible."
+ die "git checkout: updating paths is incompatible with switching branches/forcing$hint"
fi
if test '' != "$new"
then
[ -z "$branch$newbranch" ] &&
[ "$new" != "$old" ] &&
- die "git checkout: you need to specify a new branch name"
+ die "git checkout: to checkout the requested commit you need to specify
+ a name for a new branch which is created and switched to"
if [ "$force" ]
then
git-checkout-index -q -f -u -a
else
git-update-index --refresh >/dev/null
- git-read-tree -m -u $old $new || (
- echo >&2 -n "Try automerge [y/N]? "
- read yesno
- case "$yesno" in [yY]*) ;; *) exit 1 ;; esac
-
- # NEEDSWORK: We may want to reset the index from the $new for
- # these paths after the automerge happens, but it is not done
- # yet. Probably we need to leave unmerged ones alone, and
- # yank the object name & mode from $new for cleanly merged
- # paths and stuff them in the index.
-
- names=`git diff-files --name-only`
- case "$names" in
- '') ;;
- *)
- echo "$names" | git update-index --remove --stdin ;;
+ merge_error=$(git-read-tree -m -u $old $new 2>&1) || (
+ case "$merge" in
+ '')
+ echo >&2 "$merge_error"
+ exit 1 ;;
esac
+ # Match the index to the working tree, and do a three-way.
+ git diff-files --name-only | git update-index --remove --stdin &&
work=`git write-tree` &&
- git read-tree -m -u $old $work $new || exit
+ git read-tree --reset $new &&
+ git checkout-index -f -u -q -a &&
+ git read-tree -m -u $old $new $work || exit
+
if result=`git write-tree 2>/dev/null`
then
- echo >&2 "Trivially automerged." ;# can this even happen?
- exit 0
+ echo >&2 "Trivially automerged."
+ else
+ git merge-index -o git-merge-one-file -a
fi
- git merge-index -o git-merge-one-file -a
+
+ # Do not register the cleanly merged paths in the index yet.
+ # this is not a real merge before committing, but just carrying
+ # the working tree changes along.
+ unmerged=`git ls-files -u`
+ git read-tree --reset $new
+ case "$unmerged" in
+ '') ;;
+ *)
+ (
+ z40=0000000000000000000000000000000000000000
+ echo "$unmerged" |
+ sed -e 's/^[0-7]* [0-9a-f]* /'"0 $z40 /"
+ echo "$unmerged"
+ ) | git update-index --index-info
+ ;;
+ esac
+ exit 0
)
+ saved_err=$?
+ if test "$saved_err" = 0
+ then
+ test "$new" = "$old" || git diff-index --name-status "$new"
+ fi
+ (exit $saved_err)
fi
#