$ git clone -n https://src.fedoraproject.org/rpms/libldb.git /var/lib/mock/f40-build-1134962-20503/root/chroot_tmpdir/scmroot/libldb
Cloning into '/var/lib/mock/f40-build-1134962-20503/root/chroot_tmpdir/scmroot/libldb'...
$ git fetch origin 56b312d377f4bb1cc4a5950e134d871121fe6ed2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libldb
 * [new ref]         56b312d377f4bb1cc4a5950e134d871121fe6ed2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 56b312d libldb-2.9.1 is available