$ git clone -n https://src.fedoraproject.org/rpms/pmars.git /var/lib/mock/f41-build-1023983-18174/root/chroot_tmpdir/scmroot/pmars
Cloning into '/var/lib/mock/f41-build-1023983-18174/root/chroot_tmpdir/scmroot/pmars'...
$ git fetch origin 29bcda52227a2d04f63d9e00f2503483badad339:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pmars
 * [new ref]         29bcda52227a2d04f63d9e00f2503483badad339 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 29bcda5 Eliminate use of obsolete %patchN syntax (#2283636)