$ git clone -n https://src.fedoraproject.org/rpms/mp3gain.git /var/lib/mock/f41-build-772594-13506/root/chroot_tmpdir/scmroot/mp3gain
Cloning into '/var/lib/mock/f41-build-772594-13506/root/chroot_tmpdir/scmroot/mp3gain'...
$ git fetch origin f69d978a06dd1080db566180b597c776bfceef34:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mp3gain
 * [new ref]         f69d978a06dd1080db566180b597c776bfceef34 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f69d978 Eliminate use of obsolete %patchN syntax (#2283636)