$ git clone -n https://src.fedoraproject.org/rpms/flac.git /var/lib/mock/f45-build-8998-397/root/chroot_tmpdir/scmroot/flac
Cloning into '/var/lib/mock/f45-build-8998-397/root/chroot_tmpdir/scmroot/flac'...
$ git fetch origin 9cb8ed95975bc75c61297219495c4eafa66f3cff:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flac
 * [new ref]         9cb8ed95975bc75c61297219495c4eafa66f3cff -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9cb8ed9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild