$ git clone -n https://src.fedoraproject.org/rpms/mongo-c-driver.git /var/lib/mock/f41-build-772577-13506/root/chroot_tmpdir/scmroot/mongo-c-driver
Cloning into '/var/lib/mock/f41-build-772577-13506/root/chroot_tmpdir/scmroot/mongo-c-driver'...
$ git fetch origin 0f261c89786b575eb1e537f90ece7dc1cd9d1f3f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mongo-c-driver
 * [new ref]         0f261c89786b575eb1e537f90ece7dc1cd9d1f3f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0f261c8 v1.27.2