index.js

const core = require('@actions/core');
const exec = require('child_process').exec;
const version = '6.30.0';

try {
  installPMD();
} catch (error) {
  core.setFailed(error.message);
}

function installPMD(){
  var download = `wget https://github.com/pmd/pmd/releases/download/pmd_releases%2F${version}/pmd-bin-${version}.zip -P /tmp`;
  var unzip = `unzip /tmp/pmd-bin-${version}.zip -d /tmp`;
  var mk = 'mkdir $HOME/pmd';
  var mv = `mv /tmp/pmd-bin-${version}/* $HOME/pmd`; //*/
  exec(download+' && '+unzip+' && '+mk+' && '+mv, function(error, stdout, stderr){
    if(error) core.setFailed(stderr);
    core.debug(stdout);
    referencePMD();
  })
}

function referencePMD(){
  var mk = 'sudo mkdir /snap/bin && sudo chmod -R 757 /snap/bin';
  var cmd = 
`sudo echo '#! /bin/bash
$HOME/pmd/bin/run.sh pmd "$@"' > /snap/bin/pmd`;
  var cm = 'chmod +x /snap/bin/pmd';
  exec(mk+' && '+cmd+' && '+cm, function(error, stdout, stderr){
    if(error) {
      //core.setFailed(stderr);
      core.debug(error);
    }
    core.debug(stdout);
  })
}