$ git clone -n https://src.fedoraproject.org/rpms/javacc-maven-plugin.git /var/lib/mock/f41-build-1293916-23384/root/chroot_tmpdir/scmroot/javacc-maven-plugin
Cloning into '/var/lib/mock/f41-build-1293916-23384/root/chroot_tmpdir/scmroot/javacc-maven-plugin'...
$ git fetch origin 10c8edc1cbada1ab71dd36cfa1eb4644fbca9b7f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/javacc-maven-plugin
 * [new ref]         10c8edc1cbada1ab71dd36cfa1eb4644fbca9b7f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 10c8edc Version 3.1.0