$ git clone -n https://src.fedoraproject.org/rpms/libmpeg2.git /var/lib/mock/f41-build-832198-14881/root/chroot_tmpdir/scmroot/libmpeg2
Cloning into '/var/lib/mock/f41-build-832198-14881/root/chroot_tmpdir/scmroot/libmpeg2'...
$ git fetch origin 086789d75eb8797ca9d6733faacf3c774b0fe4d6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libmpeg2
 * [new ref]         086789d75eb8797ca9d6733faacf3c774b0fe4d6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 086789d Eliminate use of obsolete %patchN syntax (#2283636)