$ git clone -n https://src.fedoraproject.org/rpms/python-osrf-pycommon.git /var/lib/mock/f40-build-2106573-50593/root/chroot_tmpdir/scmroot/python-osrf-pycommon
Cloning into '/var/lib/mock/f40-build-2106573-50593/root/chroot_tmpdir/scmroot/python-osrf-pycommon'...
$ git fetch origin 900b1ef8a4cc9fffa614e619401b6b6ac619d444:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-osrf-pycommon
 * [new ref]         900b1ef8a4cc9fffa614e619401b6b6ac619d444 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 900b1ef Update to 2.1.4