$ git clone -n https://src.fedoraproject.org/rpms/libdnf.git /var/lib/mock/f40-build-2293856-56229/root/chroot_tmpdir/scmroot/libdnf
Cloning into '/var/lib/mock/f40-build-2293856-56229/root/chroot_tmpdir/scmroot/libdnf'...
$ git fetch origin 5094f46cdc6a18d8a49a6b4796131db0d1aa42c7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libdnf
 * [new ref]         5094f46cdc6a18d8a49a6b4796131db0d1aa42c7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5094f46 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild