$ git clone -n https://src.fedoraproject.org/rpms/gmediarender.git /var/lib/mock/f42-build-3275119-41320/root/chroot_tmpdir/scmroot/gmediarender
Cloning into '/var/lib/mock/f42-build-3275119-41320/root/chroot_tmpdir/scmroot/gmediarender'...
$ git fetch origin dc7f538083ec0a3063098d85d63d01bf0c6f48f6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gmediarender
 * [new ref]         dc7f538083ec0a3063098d85d63d01bf0c6f48f6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dc7f538 Retired: https://lists.fedoraproject.org/archives/list/devel-announce@lists.fedoraproject.org/thread/DRIWVJ7BVL3KVVX5TLC36LJPDMAO72HF/