$ git clone -n https://src.fedoraproject.org/rpms/libnxz.git /var/lib/mock/f40-build-769631-125732/root/chroot_tmpdir/scmroot/libnxz
Cloning into '/var/lib/mock/f40-build-769631-125732/root/chroot_tmpdir/scmroot/libnxz'...
$ git fetch origin deb83cec2258e7194ac4391cb97445c14cd338d0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libnxz
 * [new ref]         deb83cec2258e7194ac4391cb97445c14cd338d0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at deb83ce Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild