Re: git worktrees must exist even if locked

> The Git documentation in describing worktrees says that one reason
> why you might want to lock a worktree is to prevent it from being pruned
> if it is on a removable media that isn't currently mounted.
>
> So, my expectation was that if the worktree is inaccessible (and locked), Git
> would pretend that there is no worktree by that name.
>
> In reality, if you have such a worktree, Git gets an error.
>
>  On local systems, /home is local to a machine; home directories are elsewhere.
> Home directories are NFS mounted; /home is not.
>
> . create a repository in /my/home/dir/my-repo.git with
>
>     git clone --bare <some arguments>
>
> . create an empty directory /home/somedir/worktree-tests
>
> . use 'git worktree add' to add /home/somedir/worktree-tests/<branch-name>
>   as a worktree on branch <branch-name>.  It gets populated with the correct
>   content.
>
> . lock it using'git worktree lock'
>
> So far, so good.  Now, go to a different computer -- one on which
> /home/somedir/worktree-tests does not exist (and therefore
> /home/somedir/worktree-tests/<branch-name> does not exist).
>
> . cd /my/home/dir/my-repo.git
>
> Now, try issuing Git commands.  Many will fail.
>
>   git fetch ==> fails:
>
>   fatal: Invalid path '/home/somedir/worktree-tests': No such file or directory
>
>   git status ==> fails -- same error as above
>   git help worktree ==> fails -- same error as above