$ git clone -n https://src.fedoraproject.org/rpms/libdiscid.git /var/lib/mock/f45-build-16044-481/root/chroot_tmpdir/scmroot/libdiscid
Cloning into '/var/lib/mock/f45-build-16044-481/root/chroot_tmpdir/scmroot/libdiscid'...
$ git fetch origin 79fd4d00cff5073dd000b1490e28b8c5ec9b299a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libdiscid
 * [new ref]         79fd4d00cff5073dd000b1490e28b8c5ec9b299a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 79fd4d0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild