$ git clone -n https://src.fedoraproject.org/rpms/apache-commons-jxpath.git /var/lib/mock/f42-build-3421929-45166/root/chroot_tmpdir/scmroot/apache-commons-jxpath
Cloning into '/var/lib/mock/f42-build-3421929-45166/root/chroot_tmpdir/scmroot/apache-commons-jxpath'...
$ git fetch origin b0c0a7e2fe7f6edf308e6a2ea7d2c50b3304e96c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/apache-commons-jxpath
 * [new ref]         b0c0a7e2fe7f6edf308e6a2ea7d2c50b3304e96c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b0c0a7e Remove javadoc subpackage