$ git clone -n https://src.fedoraproject.org/rpms/libtdb.git /var/lib/mock/f41-build-side-1-2645525-27108/root/chroot_tmpdir/scmroot/libtdb
Cloning into '/var/lib/mock/f41-build-side-1-2645525-27108/root/chroot_tmpdir/scmroot/libtdb'...
$ git fetch origin 70519b071c8dac0134375b37ba1d7a26b20235e5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libtdb
 * [new ref]         70519b071c8dac0134375b37ba1d7a26b20235e5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 70519b0 Fix version