mirror of
https://github.com/git/git
synced 2024-08-26 19:19:18 +00:00
![Junio C Hamano](/assets/img/avatar_default.png)
"git-checkout -b frotz/nitfol master" failed to create $GIT_DIR/refs/heads/frotz/nitfol but went ahead and updated $GIT_DIR/HEAD to point at it, resulting in a corrupt repository. Exit when we cannot create the new branch with an error status. While we are at it, there is no reason to forbid subdirectories in refs/heads, so make sure we handle that correctly. Signed-off-by: Junio C Hamano <junkio@cox.net>
140 lines
3.3 KiB
Bash
Executable file
140 lines
3.3 KiB
Bash
Executable file
#!/bin/sh
|
|
. git-sh-setup || die "Not a git archive"
|
|
|
|
usage () {
|
|
die "usage: git checkout [-f] [-b <new_branch>] [<branch>] [<paths>...]"
|
|
}
|
|
|
|
old=$(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 $newbranch already exists"
|
|
git-check-ref-format "heads/$newbranch" ||
|
|
die "we do not like '$newbranch' as a branch name."
|
|
;;
|
|
"-f")
|
|
force=1
|
|
;;
|
|
--)
|
|
break
|
|
;;
|
|
-*)
|
|
usage
|
|
;;
|
|
*)
|
|
if rev=$(git-rev-parse --verify "$arg^0" 2>/dev/null)
|
|
then
|
|
if [ -z "$rev" ]; then
|
|
echo "unknown flag $arg"
|
|
exit 1
|
|
fi
|
|
new="$rev"
|
|
if [ -f "$GIT_DIR/refs/heads/$arg" ]; then
|
|
branch="$arg"
|
|
fi
|
|
elif rev=$(git-rev-parse --verify "$arg^{tree}" 2>/dev/null)
|
|
then
|
|
# checking out selected paths from a tree-ish.
|
|
new="$rev"
|
|
branch=
|
|
else
|
|
new=
|
|
branch=
|
|
set x "$arg" "$@"
|
|
shift
|
|
fi
|
|
break
|
|
;;
|
|
esac
|
|
done
|
|
|
|
# The behaviour of the command with and without explicit path
|
|
# parameters is quite different.
|
|
#
|
|
# Without paths, we are checking out everything in the work tree,
|
|
# possibly switching branches. This is the traditional behaviour.
|
|
#
|
|
# With paths, we are _never_ switching branch, but checking out
|
|
# the named paths from either index (when no rev is given),
|
|
# or the named tree-ish (when rev is given).
|
|
|
|
if test "$#" -ge 1
|
|
then
|
|
if test '' != "$newbranch$force"
|
|
then
|
|
die "updating paths and switching branches or forcing are incompatible."
|
|
fi
|
|
if test '' != "$new"
|
|
then
|
|
# from a specific tree-ish; note that this is for
|
|
# rescuing paths and is never meant to remove what
|
|
# is not in the named tree-ish.
|
|
git-ls-tree -r "$new" "$@" |
|
|
sed -ne 's/^\([0-7]*\) blob \(.*\)$/\1 \2/p' |
|
|
git-update-index --index-info || exit $?
|
|
fi
|
|
git-checkout-index -f -u -- "$@"
|
|
exit $?
|
|
else
|
|
# Make sure we did not fall back on $arg^{tree} codepath
|
|
# since we are not checking out from an arbitrary tree-ish,
|
|
# but switching branches.
|
|
if test '' != "$new"
|
|
then
|
|
git-rev-parse --verify "$new^{commit}" >/dev/null 2>&1 ||
|
|
die "Cannot switch branch to a non-commit."
|
|
fi
|
|
fi
|
|
|
|
[ -z "$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 [ "$newbranch" ]; then
|
|
leading=`expr "refs/heads/$newbranch" : '\(.*\)/'` &&
|
|
mkdir -p "$GIT_DIR/$leading" &&
|
|
echo $new >"$GIT_DIR/refs/heads/$newbranch" || exit
|
|
branch="$newbranch"
|
|
fi
|
|
[ "$branch" ] &&
|
|
GIT_DIR="$GIT_DIR" git-symbolic-ref HEAD "refs/heads/$branch"
|
|
rm -f "$GIT_DIR/MERGE_HEAD"
|
|
else
|
|
exit 1
|
|
fi
|