$ git clone -n https://src.fedoraproject.org/rpms/scrub.git /var/lib/mock/f45-build-35705-698/root/chroot_tmpdir/scmroot/scrub
Cloning into '/var/lib/mock/f45-build-35705-698/root/chroot_tmpdir/scmroot/scrub'...
$ git fetch origin 988fc01a040b6c9a3f6e2e23dacaf35bc897a78a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/scrub
 * [new ref]         988fc01a040b6c9a3f6e2e23dacaf35bc897a78a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 988fc01 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild