$ git clone -n https://src.fedoraproject.org/rpms/postfwd.git /var/lib/mock/f39-build-1518697-35812/root/chroot_tmpdir/scmroot/postfwd
Cloning into '/var/lib/mock/f39-build-1518697-35812/root/chroot_tmpdir/scmroot/postfwd'...
$ git fetch origin 31b34ed978dc5d1e12a3380537b206fa61f629e5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/postfwd
 * [new ref]         31b34ed978dc5d1e12a3380537b206fa61f629e5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 31b34ed Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild