You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
136 lines
3.2 KiB
136 lines
3.2 KiB
#!/bin/sh |
|
|
|
USAGE='[-f] [-b <new_branch>] [<branch>] [<paths>...]' |
|
. git-sh-setup |
|
|
|
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 "$new" "$@" | |
|
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
|
|
|