$ git clone -n https://src.fedoraproject.org/rpms/nbd.git /var/lib/mock/f39-build-1511697-35546/root/chroot_tmpdir/scmroot/nbd
Cloning into '/var/lib/mock/f39-build-1511697-35546/root/chroot_tmpdir/scmroot/nbd'...
$ git fetch origin 906280a6e5c296bcad2d3b17e0d8f65bca3c5b40:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nbd
 * [new ref]         906280a6e5c296bcad2d3b17e0d8f65bca3c5b40 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 906280a Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild