Re: [PATCH v3 07/14] commit-graph: update graph-head during write

From: Junio C Hamano <gitster@pobox.com>
Date: Feb 12, 2018, 18:56 UTC
Message-ID: <xmqqeflqt4st.fsf@gitster-ct.c.googlers.com>
In-Reply-To: <1518122258-157281-8-git-send-email-dstolee@microsoft.com>

Derrick Stolee <stolee@gmail.com> writes:

> It is possible to have multiple commit graph files in a pack directory,
> but only one is important at a time. Use a 'graph_head' file to point
> to the important file. Teach git-commit-graph to write 'graph_head' upon
> writing a new commit graph file.

Why this design, instead of what "repack -a" would do, iow, if there always is a singleton that is the only one that matters, shouldn't the creation of that latest singleton just clear the older ones before it returns control?

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