$ git clone -n https://src.fedoraproject.org/rpms/clamav-unofficial-sigs.git /var/lib/mock/f45-build-3950-329/root/chroot_tmpdir/scmroot/clamav-unofficial-sigs
Cloning into '/var/lib/mock/f45-build-3950-329/root/chroot_tmpdir/scmroot/clamav-unofficial-sigs'...
$ git fetch origin 6fbb466b7c2bd97b86104848c1c7ca543db9a7f6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/clamav-unofficial-sigs
 * [new ref]         6fbb466b7c2bd97b86104848c1c7ca543db9a7f6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6fbb466 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild