create_environment_scripts.js

#!/usr/bin/env node
///
/// Little script to copy the current UPS enviroment into a few 
/// static scripts.  This should be called every time you change enviromnent.
///

/// Creates the file ups_env.json
var fs = require('fs');


// Template for nodemon file
var nodemon = {
  "__comment" : "This file is auto-generated from create_environment_scripts.js. Make changes there!",
  verbose: true,
  signal: "sighup",
  ext: "js pug inc dylib so",
  ignore: ["static/**", "logs/*"],
}


var pm_scripts = {
  pm2: {
  "__comment" : "pm2.json This file is auto-generated from create_environment_scripts.js. Make changes there!",  
  "apps" : [
     {
            "name": "argo-node",
            "script": "index.js",
            "watch": false,
            "error_file":__dirname+"/logs/argo.err",
            "out_file":__dirname+"/logs/argo.out",
            "cwd":__dirname,
            "env": {
              "NODE_ENV": "production",
            }
      }
   ]
  },

pm2_live: {
  "__comment" : "pm2_live.json This file is auto-generated from create_environment_scripts.js. Make changes there!",  
  "apps" : [
      {
            name: 'argo-live-backend',
            "cwd":__dirname,
            script: 'libargo/run-live-backend.sh',
            exec_interpreter: 'bash',
            exec_mode: "fork_mode",
            args: "libargo/live.config.json",
            env : {

            }
      }
   ]  
  }
};

// node-cluster is responsible for clustering, not pm2
// "exec_mode" : "cluster",
// "instances" : 2,
// "wait_ready": true,
// "listen_timeout": 20000,



var obj = { DYLD_LIBRARY_PATH :null
          , DYLD_FALLBACK_LIBRARY_PATH:null
          , LD_LIBRARY_PATH   :null
          , ROOT_INCLUDE_PATH :null
          , PYTHONPATH        :null
          , PYTHONHOME        :null
          , PATH              :null	  
          };



// Nodemon script.
nodemon.env = {};
for(v in obj) {
  nodemon.env[v] = process.env[v]; // get current variable.  
}
nodemon.env["DYLD_LIBRARY_PATH"] = "";
nodemon.env["DYLD_FALLBACK_LIBRARY_PATH"] = process.env["DYLD_LIBRARY_PATH"];

fs.writeFileSync(__dirname+"/nodemon.json",JSON.stringify(nodemon,null,2));



// Pm2 scripts.

if(__dirname.includes("_dev")) {
  // Development version!  Rename the output exec
  pm_scripts.pm2.apps[0].name="argo-dev";
}

for(var scpt in pm_scripts) {
    var pm2 = pm_scripts[scpt];
    for(var iapp=0;iapp<pm2.apps.length;iapp++){
      for(v in obj) {
        pm2.apps[iapp].env[v] = process.env[v]; // get current variable.  
      }
      pm2.apps[iapp].env["DYLD_LIBRARY_PATH"] = "";
      pm2.apps[iapp].env["DYLD_FALLBACK_LIBRARY_PATH"] = process.env["DYLD_LIBRARY_PATH"];
    }
    fs.writeFileSync(__dirname+"/"+scpt+".json",JSON.stringify(pm2,null,2));
}



if(fs.existsSync("/etc/systemd/system"))
{
  // We're running on a linux system, so we want to use PM2.

  // Create an environment file usable by the PM2 startup script.
  // We'll do this by creating an extra config file that systemd looks at, which is cool!
  // https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/system_administrators_guide/sect-Managing_Services_with_systemd-Unit_Files#brid-Managing_Services_with_systemd-Extending_Unit_Config

  // The downside to this method: all scripts run under pm2 will use this enviroment! Boo!

  // Build the file.
  var cf = "";
  cf += "# File auto-generated by Argo create_environment_scripts.js\n";
  cf += "Environment=PATH="+process.env["PATH"]+"\n";
  cf += "Environment=LD_LIBRARY_PATH="+process.env["LD_LIBRARY_PATH"]+"\n";
  cf += "Environment=ROOT_INCLUDE_PATH="+process.env["ROOT_INCLUDE_PATH"]+"\n";
  cf += "Environment=PYTHONPATH="+process.env["PYTHONPATH"]+"\n";
  cf += "Environment=PYTHONHOME="+process.env["PYTHONHOME"]+"\n";


  var need_to_redeploy = true;
  var conf_file_path = "/etc/systemd/system/pm2-"+process.env["USER"]+".service.d/";
  var conf_file_name = "argo-environment.conf";

  if(fs.existsSync(conf_file_path+conf_file_name)) {
    var old_cf = fs.readFileSync(conf_file_path+conf_file_name);
    if(old_cf == cf) need_to_redeploy = false;
  }
  if(need_to_redeploy) {
    fs.writeFileSync(__dirname+"/"+conf_file_name,cf);    
    console.log("PM2 environment is not ready. To prepare:");
    if(!fs.existsSync(conf_file_path))
      console.log('   ksu -a -c "mkdir -m 755 '+conf_file_path+'"');
    console.log  ('   ksu -a -c "cp ./'+__dirname+"/"+conf_file_name+' '+conf_file_path+conf_file_name+ '" && rm '+__dirname+"/"+conf_file_name );
    console.log  ('   ksu -a -c "systemctl daemon-reload"');
    console.log  ('   ksu -a -c "systemctl restart pm2-'+process.env["USER"]+'.service"');

  }
}