$ git clone -n https://src.fedoraproject.org/rpms/whatsup.git /var/lib/mock/f45-build-38353-723/root/chroot_tmpdir/scmroot/whatsup
Cloning into '/var/lib/mock/f45-build-38353-723/root/chroot_tmpdir/scmroot/whatsup'...
$ git fetch origin 737a6505acb0566c860beb80aca85f63e7dac700:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/whatsup
 * [new ref]         737a6505acb0566c860beb80aca85f63e7dac700 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 737a650 Perl 5.44 rebuild