mirror of
https://github.com/git/git.git
synced 2024-09-30 17:11:23 +02:00
7f88c8463c
If you make a commit on a path, and then make the path cache-dirty afterwards without changing its contents, 'git checkout' to switch to another branch is prevented because switching the branches done with 'read-tree -m -u $current $next' detects that the path is cache-dirty, but it does not bother noticing that the contents of the path has not been actualy changed. Since switching branches would involve checking out paths different in the two branches, hence it is reasonably expensive operation, we can afford to run update-index before running read-tree to reduce this kind of false change from triggering the check needlessly. Signed-off-by: Junio C Hamano <junkio@cox.net>
78 lines
1.6 KiB
Bash
Executable File
78 lines
1.6 KiB
Bash
Executable File
#!/bin/sh
|
|
. git-sh-setup || die "Not a git archive"
|
|
|
|
old=$(git-rev-parse HEAD)
|
|
new=
|
|
force=
|
|
branch=
|
|
newbranch=
|
|
while [ "$#" != "0" ]; do
|
|
arg="$1"
|
|
shift
|
|
case "$arg" in
|
|
"-b")
|
|
newbranch="$1"
|
|
shift
|
|
[ -z "$newbranch" ] &&
|
|
die "git checkout: -b needs a branch name"
|
|
[ -e "$GIT_DIR/refs/heads/$newbranch" ] &&
|
|
die "git checkout: branch $newbranch already exists"
|
|
;;
|
|
"-f")
|
|
force=1
|
|
;;
|
|
*)
|
|
rev=$(git-rev-parse --verify "$arg^0") || exit
|
|
if [ -z "$rev" ]; then
|
|
echo "unknown flag $arg"
|
|
exit 1
|
|
fi
|
|
if [ "$new" ]; then
|
|
echo "Multiple revisions?"
|
|
exit 1
|
|
fi
|
|
new="$rev"
|
|
if [ -f "$GIT_DIR/refs/heads/$arg" ]; then
|
|
branch="$arg"
|
|
fi
|
|
;;
|
|
esac
|
|
done
|
|
[ -z "$new" ] && new=$old
|
|
|
|
#
|
|
# If we don't have an old branch that we're switching to,
|
|
# and we don't have a new branch name for the target we
|
|
# are switching to, then we'd better just be checking out
|
|
# what we already had
|
|
#
|
|
[ -z "$branch$newbranch" ] &&
|
|
[ "$new" != "$old" ] &&
|
|
die "git checkout: you need to specify a new branch name"
|
|
|
|
if [ "$force" ]
|
|
then
|
|
git-read-tree --reset $new &&
|
|
git-checkout-index -q -f -u -a
|
|
else
|
|
git-update-index --refresh >/dev/null
|
|
git-read-tree -m -u $old $new
|
|
fi
|
|
|
|
#
|
|
# Switch the HEAD pointer to the new branch if it we
|
|
# checked out a branch head, and remove any potential
|
|
# old MERGE_HEAD's (subsequent commits will clearly not
|
|
# be based on them, since we re-set the index)
|
|
#
|
|
if [ "$?" -eq 0 ]; then
|
|
if [ "$newbranch" ]; then
|
|
echo $new > "$GIT_DIR/refs/heads/$newbranch"
|
|
branch="$newbranch"
|
|
fi
|
|
[ "$branch" ] && ln -sf "refs/heads/$branch" "$GIT_DIR/HEAD"
|
|
rm -f "$GIT_DIR/MERGE_HEAD"
|
|
else
|
|
exit 1
|
|
fi
|