git-branch -D: make it work even when on a yet-to-be-born branch

This makes "git branch -D other_branch" work even when HEAD
points at a yet-to-be-born branch.

Earlier, we checked the HEAD ref for the purpose of "subset"
check even when the deletion was forced (i.e. not -d but -D).
Because of this, you cannot delete a branch even with -D while
on a yet-to-be-born branch.

With this change, the following sequence that now works:

	mkdir newdir && cd newdir
	git init-db
	git fetch -k $other_repo refs/heads/master:refs/heads/othre
	# oops, typo
	git branch other othre
	git branch -D othre

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/builtin-branch.c b/builtin-branch.c
index 69b7b55d86ffb70243d69a5b61de839bff8ccf60..3d5cb0e4b2de8abf3a9f1af8fadb9c1bc5393967 100644 (file)
--- a/builtin-branch.c
+++ b/builtin-branch.c
@@ -38,12 +38,16 @@ static int in_merge_bases(const unsigned char *sha1,
 
 static void delete_branches(int argc, const char **argv, int force)
 {
-       struct commit *rev, *head_rev;
+       struct commit *rev, *head_rev = head_rev;
        unsigned char sha1[20];
        char *name;
        int i;
 
-       head_rev = lookup_commit_reference(head_sha1);
+       if (!force) {
+               head_rev = lookup_commit_reference(head_sha1);
+               if (!head_rev)
+                       die("Couldn't look up commit object for HEAD");
+       }
        for (i = 0; i < argc; i++) {
                if (!strcmp(head, argv[i]))
                        die("Cannot delete the branch you are currently on.");
@@ -53,8 +57,8 @@ static void delete_branches(int argc, const char **argv, int force)
                        die("Branch '%s' not found.", argv[i]);
 
                rev = lookup_commit_reference(sha1);
-               if (!rev || !head_rev)
-                       die("Couldn't look up commit objects.");
+               if (!rev)
+                       die("Couldn't look up commit object for '%s'", name);
 
                /* This checks whether the merge bases of branch and
                 * HEAD contains branch -- which means that the HEAD