$ git clone -n https://src.fedoraproject.org/rpms/libdnf.git /var/lib/mock/f40-build-785863-134131/root/chroot_tmpdir/scmroot/libdnf
Cloning into '/var/lib/mock/f40-build-785863-134131/root/chroot_tmpdir/scmroot/libdnf'...
$ git fetch origin 836183e012a3897ec8cd7a30f64cd9597ef3a5b1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libdnf
 * [new ref]         836183e012a3897ec8cd7a30f64cd9597ef3a5b1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 836183e Update to 0.73.0