$ git clone -n https://src.fedoraproject.org/rpms/libldb.git /var/lib/mock/f40-build-785904-134133/root/chroot_tmpdir/scmroot/libldb
Cloning into '/var/lib/mock/f40-build-785904-134133/root/chroot_tmpdir/scmroot/libldb'...
$ git fetch origin 823723503950a1181bc0e15fbf027d2cc0a08eae:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libldb
 * [new ref]         823723503950a1181bc0e15fbf027d2cc0a08eae -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8237235 libldb-2.9.0 is available