$ git clone -n https://src.fedoraproject.org/rpms/gcal.git /var/lib/mock/f45-build-9656-407/root/chroot_tmpdir/scmroot/gcal
Cloning into '/var/lib/mock/f45-build-9656-407/root/chroot_tmpdir/scmroot/gcal'...
$ git fetch origin 9a6d9f5fd823c012e1c59f49ca2dfc4b3b61eb55:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gcal
 * [new ref]         9a6d9f5fd823c012e1c59f49ca2dfc4b3b61eb55 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9a6d9f5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild