$ git clone -n https://src.fedoraproject.org/rpms/libldb.git /var/lib/mock/f41-build-815168-149422/root/chroot_tmpdir/scmroot/libldb
Cloning into '/var/lib/mock/f41-build-815168-149422/root/chroot_tmpdir/scmroot/libldb'...
$ git fetch origin bc88d049ba4ac774fe6eea9d6fcd3ceadac41450:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libldb
 * [new ref]         bc88d049ba4ac774fe6eea9d6fcd3ceadac41450 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bc88d04 libldb-2.9.1 is available