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




On Tue, May 14, 2019 at 9:53 PM Cosmin Polifronie <oppturbv@xxxxxxxxx> wrote:
>
> Hello! I am trying to run 'git worktree add <path> HEAD' in the
> 'pre-commit' hook, more specifically in a Python script that is being
> called from the hook. When doing so, I am greeted with the following
> error:
>
> On Windows 10:
> Preparing worktree (detached HEAD cbfef18)
> fatal: Unable to create 'C:/Users/meh/Desktop/abc/.git/index.lock': No
> such file or directory
>
> On Arch Linux:
> Preparing worktree (detached HEAD cbfef18)
> fatal: Unable to create '/home/cosmin/Downloads/abc/.git/index.lock':
> Not a directory
>
> Is it forbidden to call this command from a hook?

pre-commit hook sets GIT_INDEX_FILE to this "index.lock" so you have
the latest index content (which is not the same as from
$GIT_DIR/index). This variable will interfere with any commands that
work on a different worktree.

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). To make sure you don't have similar problems, you
probably should do "env | grep GIT" from the hook and see if any other
variables are set.

> If yes, what kind of
> alternatives do I have? I need to make a copy of the repo in its HEAD
> state, process it and then decide if I will pass the current commit or
> not.
>
> Thanks! :)



-- 
Duy