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#!/bin/sh
. git-sh-setup-script || 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
i=$(($i+1))
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-cache -q -f -u -a
else
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"
fi
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