trivial: use git-repo-config to detect if the test can be run on the repository

diff --git a/git-checkout.sh b/git-checkout.sh
index cb33fdc7e20272a77d97d1b68c31d9b93d3cf4d4..36308d22c6a72b9ad53ced60bd3c70a2e17520b6 100755 (executable)
--- a/git-checkout.sh
+++ b/git-checkout.sh
@@ -1,9 +1,7 @@
 #!/bin/sh
-. git-sh-setup || die "Not a git archive"
 
-usage () {
-    die "usage: git checkout [-f] [-b <new_branch>] [<branch>] [<paths>...]"
-}
+USAGE='[-f] [-b <new_branch>] [<branch>] [<paths>...]'
+. git-sh-setup
 
 old=$(git-rev-parse HEAD)
 new=
@@ -82,7 +80,6 @@ then
                # rescuing paths and is never meant to remove what
                # is not in the named tree-ish.
                git-ls-tree -r "$new" "$@" |
-               sed -ne 's/^\([0-7]*\) blob \(.*\)$/\1 \2/p' |
                git-update-index --index-info || exit $?
        fi
        git-checkout-index -f -u -- "$@"
@@ -119,14 +116,16 @@ else
 fi
 
 # 
-# Switch the HEAD pointer to the new branch if it we
+# Switch the HEAD pointer to the new branch if 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/$newbranch"
+               leading=`expr "refs/heads/$newbranch" : '\(.*\)/'` &&
+               mkdir -p "$GIT_DIR/$leading" &&
+               echo $new >"$GIT_DIR/refs/heads/$newbranch" || exit
                branch="$newbranch"
        fi
        [ "$branch" ] &&