$ git clone -n https://src.fedoraproject.org/rpms/mongo-c-driver.git /var/lib/mock/f38-build-side-42-init-devel-628022-26370/root/chroot_tmpdir/scmroot/mongo-c-driver
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-628022-26370/root/chroot_tmpdir/scmroot/mongo-c-driver'...
$ git fetch origin be4d45c31717ab978052025cceb96227affc8a2b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mongo-c-driver
 * [new ref]         be4d45c31717ab978052025cceb96227affc8a2b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at be4d45c v1.23.3