2 . git-sh-setup || die "Not a git archive"
4 old=$(git-rev-parse HEAD)
9 while [ "$#" != "0" ]; do
16 [ -z "$newbranch" ] &&
17 die "git checkout: -b needs a branch name"
18 [ -e "$GIT_DIR/refs/heads/$newbranch" ] &&
19 die "git checkout: branch $newbranch already exists"
25 rev=$(git-rev-parse --verify "$arg^0" 2>/dev/null) ||
26 die "I don't know any '$arg'."
27 if [ -z "$rev" ]; then
28 echo "unknown flag $arg"
32 echo "Multiple revisions?"
36 if [ -f "$GIT_DIR/refs/heads/$arg" ]; then
42 [ -z "$new" ] && new=$old
45 # If we don't have an old branch that we're switching to,
46 # and we don't have a new branch name for the target we
47 # are switching to, then we'd better just be checking out
50 [ -z "$branch$newbranch" ] &&
51 [ "$new" != "$old" ] &&
52 die "git checkout: you need to specify a new branch name"
56 git-read-tree --reset $new &&
57 git-checkout-index -q -f -u -a
59 git-update-index --refresh >/dev/null
60 git-read-tree -m -u $old $new
64 # Switch the HEAD pointer to the new branch if it we
65 # checked out a branch head, and remove any potential
66 # old MERGE_HEAD's (subsequent commits will clearly not
67 # be based on them, since we re-set the index)
69 if [ "$?" -eq 0 ]; then
70 if [ "$newbranch" ]; then
71 echo $new > "$GIT_DIR/refs/heads/$newbranch"
75 GIT_DIR="$GIT_DIR" git-symbolic-ref HEAD "refs/heads/$branch"
76 rm -f "$GIT_DIR/MERGE_HEAD"