Re: Best way to check whether working tree matches a commit's tree

From: Junio C Hamano <gitster@pobox.com>
Date: Aug 22, 2017, 19:34 UTC
Message-ID: <xmqqfucj2y7d.fsf@gitster.mtv.corp.google.com>
In-Reply-To: <onhres$g9$1@blaine.gmane.org>

Sebastian Schuberth <sschuberth@gmail.com> writes:

Show 10 quoted lines

> Hi,
>
> I'd like to check whether my working tree exactly matches the tree of a given commit. That is, there should not be any untracked, staged or modified files (including ignored files).
>
> Currently, I'm doing this in two steps:
>
> - check for success and empty output of "git status --ignored --porcelain"
> - check that the output of "git rev-parse HEAD" matches the given commit
>
> While this works, it feels sub-optimal. Is there a better / smarter way?

I do not think so; you want three things to match and you have a way to compare two things at a time.

By the way, I think your second check should compare

	rev-parse HEAD^{tree} $that_commit^{tree}

as you are checking if the tree exactly matches.