$ git clone -n https://src.fedoraproject.org/rpms/t-digest.git /var/lib/mock/f41-build-1673693-24211/root/chroot_tmpdir/scmroot/t-digest
Cloning into '/var/lib/mock/f41-build-1673693-24211/root/chroot_tmpdir/scmroot/t-digest'...
$ git fetch origin af5a0531b62082fe3d68bc03ebabab93a125c669:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/t-digest
 * [new ref]         af5a0531b62082fe3d68bc03ebabab93a125c669 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at af5a053 Eliminate use of obsolete %patchN syntax (#2283636)