$ git clone -n https://src.fedoraproject.org/rpms/sing.git /var/lib/mock/f41-build-814533-14252/root/chroot_tmpdir/scmroot/sing
Cloning into '/var/lib/mock/f41-build-814533-14252/root/chroot_tmpdir/scmroot/sing'...
$ git fetch origin 4b6cea1a646a1632b37deab07902f8891f5ce136:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sing
 * [new ref]         4b6cea1a646a1632b37deab07902f8891f5ce136 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4b6cea1 Eliminate use of obsolete %patchN syntax (#2283636)