From b6325cb3a27c64e7286a8d51a092741006534433 Mon Sep 17 00:00:00 2001
From: Phillip Wood <phillip.wood@dunelm.org.uk>
Date: Thu, 27 Apr 2023 16:31:49 +0100
Subject: [PATCH] sequencer: keep track of HEAD

When committing in-process we know what commit HEAD points to so we
don't need to call get_oid(). We only need to read HEAD on start-up and
after forking "git commit"