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Re: Running 'git worktree add' in 'pre-commit' hook

On Thu, May 16, 2019 at 7:42 AM Duy Nguyen <pclouds@xxxxxxxxx> wrote:
> On Thu, May 16, 2019 at 6:33 PM Eric Sunshine <sunshine@xxxxxxxxxxxxxx> wrote:
> > You run afoul of it in other situations, as well. For instance, say
> > you have your index file in a non-standard location:
> >
> >     $ export GIT_INDEX_FILE=../storage/index
> >     $ git worktree add --detach other
> >     Preparing worktree (detached HEAD c9156d2)
> >     fatal: Unable to create '/.../foo/other/../storage/index.lock': No
> > such file or directory
> >     $
> >
> Oh if it's relative $GIT_INDEX_FILE then I think its our environment.c
> code that does not work so well when we chdir() away. I vaguely recall
> something about this when discussing Jeff's chdir-notify series. But
> it turns out that's about chdir() in run-command.c [1]. But the idea
> is still the same, all variables are supposed to be relative to $CWD.
> Whenever you move $CWD you should reparent all of them, including

builtin/worktree.c:add_worktree() is already assigning
new-worktree-specific values for GIT_DIR and GIT_WORK_TREE, so for the
specific example I showed above, the correct fix would be for
add_worktree() to remove GIT_INDEX_FILE from the environment before
invoking other Git commands, correct?