$ git clone -n https://src.fedoraproject.org/rpms/appstream-data.git /var/lib/mock/f41-build-side-1-2897772-34638/root/chroot_tmpdir/scmroot/appstream-data
Cloning into '/var/lib/mock/f41-build-side-1-2897772-34638/root/chroot_tmpdir/scmroot/appstream-data'...
$ git fetch origin 5d27ce5541f20618c15e12c5fd72e20eeb5c1c85:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/appstream-data
 * [new ref]         5d27ce5541f20618c15e12c5fd72e20eeb5c1c85 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5d27ce5 New metadata version