Re: [BUG] Wrong worktree path when using multiple worktree

On Tue, Nov 3, 2015 at 5:27 PM, Mike Rappazzo [off-list ref] wrote:

On Tue, Nov 3, 2015 at 11:58 AM, Nicolas Morey-Chaisemartin
[off-list ref] wrote:

quoted

Hi,

There seem to be an issue with the path computed for a worktree when multiple worktree were created (using git worktree)
In my Setup, I have 3 repos:
A/repo (main One)
A/repo-patches (worktree, using branch dev)
B/repo (worktree, using branch next)

I'm working in A/repo-patches an run:
$ git checkout next
fatal: 'next' is already checked out at 'A/repo-patches'

Which is partially true but not completely.
I looked a bit in the code and found that the issue comes from here (get_linked_worktree):
    if (!strbuf_strip_suffix(&worktree_path, "/.git")) {
        strbuf_reset(&worktree_path);
        strbuf_addstr(&worktree_path, absolute_path("."));
        strbuf_strip_suffix(&worktree_path, "/.");
    }
Because it wrongfully assumes that I am in the linked worktree.
I checked in the .git/worktree files and couldn't see anything that actually points to where the repo are setup.

Nicolas

This is code that I worked on, but I am unable to reproduce it locally
just yet.  Before I dig too deep, could you report the contents of
"A/repo/.git/worktrees/repo-patches/gitdir" (or similar)?  There is
another issue reported[1] where the contents of the gitdir for a
linked worktree are overwritten in some cases.  A fix for this is
being worked on (see discussion).

In the mean time, I will continue to try and reproduce.

[1]: http://thread.gmane.org/gmane.comp.version-control.git/280307

Followup:  I was able to reproduce the error when I tried to simulate
the aforementioned bug.  Here is a test which I added to t2027 (not
intended to publish):

+test_expect_success '"checkout" branch already checked out' '
+ git worktree add -b linked_1_br linked_1 master &&
+ git worktree add -b linked_2_br linked_2 master &&
+ echo ".git" > .git/worktrees/linked_2/gitdir &&
+ test_must_fail git -C linked_1 checkout linked_2_br
+'
+

Test run result:
--------------------
Preparing linked_1 (identifier linked_1)
HEAD is now at 2519212 init
Preparing linked_2 (identifier linked_2)
HEAD is now at 2519212 init
fatal: 'linked_2_br' is already checked out at
'/Users/mike/code/git-source/t/trash
directory.t2027-worktree-list/linked_1'