Re: [PATCH 2/2] setup: don't fail if commondir reference is deleted.

> On Tue, Feb 19, 2019 at 12:05 AM Michal Suchanek <msuchanek@suse.de> wrote:
> >
> > When adding wotktrees git can die in get_common_dir_noenv while
> > examining existing worktrees because the commondir file does not exist.
> > Rather than testing if the file exists before reading it handle ENOENT.  
> 
> I don't think we could go around fixing every access to incomplete
> worktrees like this. If this is because of racy 'worktree add', then
> perhaps a better solution is make it absolutely clear it's not ready
> for anybody to access.
> 
> For example, we can suffix the worktree directory name with ".lock"
> and make sure get_worktrees() ignores entries ending with ".lock".
> That should protect other commands while 'worktree add' is still
> running. Only when the worktree is complete that 'worktree add' should
> rename the directory to lose ".lock" and run external commands like
> git-checkout to populate the worktree.