$ git clone -n https://src.fedoraproject.org/rpms/apache-commons-logging.git /var/lib/mock/f42-build-3408524-45145/root/chroot_tmpdir/scmroot/apache-commons-logging
Cloning into '/var/lib/mock/f42-build-3408524-45145/root/chroot_tmpdir/scmroot/apache-commons-logging'...
$ git fetch origin 75daf2b40712e2c73894fccfd16e9dc25c285e8c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/apache-commons-logging
 * [new ref]         75daf2b40712e2c73894fccfd16e9dc25c285e8c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 75daf2b Remove javadoc subpackage