$ git clone -n https://src.fedoraproject.org/rpms/ghc-data-accessor.git /var/lib/mock/f38-build-side-42-init-devel-908120-28670/root/chroot_tmpdir/scmroot/ghc-data-accessor
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-908120-28670/root/chroot_tmpdir/scmroot/ghc-data-accessor'...
$ git fetch origin b6316f08f7c99f075218768b80ac493cf439b029:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-data-accessor
 * [new ref]         b6316f08f7c99f075218768b80ac493cf439b029 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b6316f0 Convert to %autorelease and %autochangelog