$ git clone -n https://src.fedoraproject.org/rpms/ghc-unix-compat.git /var/lib/mock/f38-build-side-42-init-devel-657369-26596/root/chroot_tmpdir/scmroot/ghc-unix-compat
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-657369-26596/root/chroot_tmpdir/scmroot/ghc-unix-compat'...
$ git fetch origin 2b8327011a87eb4a56e5bb060273d6a37f908bf0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-unix-compat
 * [new ref]         2b8327011a87eb4a56e5bb060273d6a37f908bf0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2b83270 Convert to %autorelease and %autochangelog