From: Junio C Hamano <gitster@pobox.com>
Date: Sat, 17 Mar 2018 17:57:28 GMT
Subject: Re: get commit ID from a tree object ID
Message-ID: <xmqqwoyay48n.fsf@gitster-ct.c.googlers.com>
In-Reply-To: <20180317161819.GB25113@sigill.intra.peff.net>

Jeff King <peff@peff.net> writes:

> If you want to dig further, you can use the diff machinery to show which
> commit introduced a particular tree, like:
>
>   git rev-list --all |
>   git diff-tree --stdin --pretty=raw --raw -t -r |
>   less +/$desired_tree
>
> That "less" will find the mentioned tree, and then you'll have to
> manually read the commit. It would be possible to do it mechanically
> with a short perl script, but I'll leave that as an exercise for the
> reader.

Before Stefan jumps in ;-) I wonder if a recently materialized
"find-object" option to the diff family can be used here as a
sugar-coated way.