[PATCH] worktree: allow the main brach of a bare repository to be checked out

[Dennis Kaarsemaker <dennis@kaarsemaker.net>]

In bare repositories, get_worktrees() still returns the main repository,
so git worktree list can show it. ignore it in find_shared_symref so we
can still check out the main branch.

Signed-off-by: Dennis Kaarsemaker <dennis@kaarsemaker.net>
---
 t/t2025-worktree-add.sh | 8 ++++++++
 worktree.c              | 2 ++
 2 files changed, 10 insertions(+)

On Sun, 2016-10-09 at 17:52 +0700, Duy Nguyen wrote:
> On Sun, Oct 9, 2016 at 2:51 PM, Dennis Kaarsemaker > <dennis@kaarsemaker.net> wrote:
> > On Sat, 2016-10-08 at 19:30 -0500, Michael Tutty wrote:
> > > 
> > > The only exception seems to be merging to master. When I do git
> > > worktree add /tmp/path/to/worktree master I get an error:
> > > 
> > > [fatal: 'master' is already checked out at '/path/to/bare/repo']
> > > 
> > 
> > The worktree code treats the base repo as a worktree, even if it's
> > bare. For the purpose of being able to do a checkout of the main branch
> > of a bare repo, this patch should do:
> > 
> --snip--
> 
> You're fast :) I'm still studying  8d9fdd7 (worktree.c: check whether
> branch is rebased in another worktree - 2016-04-22). But yeah that
> should fix it.

OK, so here it is as a proper patch.

D.

diff --git a/t/t2025-worktree-add.sh b/t/t2025-worktree-add.sh
index 4bcc335..2996c38 100755
--- a/t/t2025-worktree-add.sh
+++ b/t/t2025-worktree-add.sh
@@ -138,6 +138,14 @@ test_expect_success 'checkout from a bare repo without "add"' '
 	)
 '
 
++test_expect_success '"add" default branch of a bare repo' '
+	(
+		git clone --bare . bare2 &&
+		cd bare2 &&
+		git worktree add ../there3 master
+	)
+'
+
 test_expect_success 'checkout with grafts' '
 	test_when_finished rm .git/info/grafts &&
 	test_commit abc &&
diff --git a/worktree.c b/worktree.c
index 5acfe4c..35e95b7 100644
--- a/worktree.c
+++ b/worktree.c
@@ -345,6 +345,8 @@ const struct worktree *find_shared_symref(const char *symref,
 
 	for (i = 0; worktrees[i]; i++) {
 		struct worktree *wt = worktrees[i];
+		if(wt->is_bare)
+			continue;
 
 		if (wt->is_detached && !strcmp(symref, "HEAD")) {
 			if (is_worktree_being_rebased(wt, target)) {
-- 
2.10.1-356-g947a599


-- 
Dennis Kaarsemaker <dennis@kaarsemaker.net>
http://twitter.com/seveas