$ git clone -n https://src.fedoraproject.org/rpms/migrationtools.git /var/lib/mock/f41-build-1022360-18070/root/chroot_tmpdir/scmroot/migrationtools
Cloning into '/var/lib/mock/f41-build-1022360-18070/root/chroot_tmpdir/scmroot/migrationtools'...
$ git fetch origin 6b1a6dfce818b2cb849d5ee85f4e74550f46eac4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/migrationtools
 * [new ref]         6b1a6dfce818b2cb849d5ee85f4e74550f46eac4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6b1a6df Eliminate use of obsolete %patchN syntax (#2283636)