$ git clone -n https://src.fedoraproject.org/rpms/flac123.git /var/lib/mock/f45-build-9001-397/root/chroot_tmpdir/scmroot/flac123
Cloning into '/var/lib/mock/f45-build-9001-397/root/chroot_tmpdir/scmroot/flac123'...
$ git fetch origin 574bdfc11b286ab41e0b05b6d682e9e008d37f7f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flac123
 * [new ref]         574bdfc11b286ab41e0b05b6d682e9e008d37f7f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 574bdfc Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild