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

On Thu, May 16, 2019 at 6:17 PM Jeff King <peff@xxxxxxxx> wrote:
> On Thu, May 16, 2019 at 06:25:24PM +0700, Duy Nguyen wrote:
> > So you probably can still make it work by backing up $GIT_INDEX_FILE
> > (in case you need it), then unset it before you use "git worktree" (or
> > cd to it if you keep a permanent separate worktree for pre-commit
> > activities). [...]
> The case of actually _adding_ a new work tree (before we enter it) is
> weirder, though. We definitely want to stay in the same repository, and
> clearing all of that would not make sense. I do wonder if worktree-add
> should be handling GIT_INDEX_FILE (ignoring it when we want to be
> dealing with the index of the new worktree we added, and handling any
> relative fixups if we chdir inside the worktree code).

Ignoring GIT_INDEX_FILE was indeed the conclusion reached earlier in
this thread. Addressing your other point, "git worktree add" does
chdir() into the new worktree if a post-checkout hook exists since
that hook needs to run in the new worktree, not in the worktree in
which the "git worktree add" command itself was invoked. For the hook
invocation, it already sanitizes the environment of GIT_DIR and
GIT_WORK_TREE, and GIT_INDEX_FILE ought to be cleaned too. Is there
any existing code in Git for doing the relative fixups you mention for
other Git environment variables?