$ git clone -n https://src.fedoraproject.org/rpms/starcal.git /var/lib/mock/f45-build-36486-706/root/chroot_tmpdir/scmroot/starcal
Cloning into '/var/lib/mock/f45-build-36486-706/root/chroot_tmpdir/scmroot/starcal'...
$ git fetch origin 65a4fec66bb28d0a4cce8a692adc852cacd7d6fb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/starcal
 * [new ref]         65a4fec66bb28d0a4cce8a692adc852cacd7d6fb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 65a4fec Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild