profoundjs/setup/removeExtraComponents.js

Profound.js Framework and Server

"use strict";

/*
  Discovers and removes additional components that exist outside of the package installation directory.

  It's used by Profound Installer

  Any changes to the behavior may require changes to the "install_info.json" file or Profound Installer.
*/
const child_process = require("child_process");
const minimist = require("minimist");
const iutils = require("./install_utils.js");
const readline = require("readline");

const IBMi = iutils.isIBMi();

(async() => {
  try {
    // Parse arguments.
    const argDefs = {
      alias: {
        "h": "help",
        "d": "dry-run",
        "s": "silent"
      },
      boolean: [
        "h",
        "d",
        "s"
      ],
      unknown: function(arg) {
        console.error("removeExtraComponents.js: Unknown argument:", arg);
        process.exit(1);
      }
    };
    const args = minimist(process.argv.slice(2), argDefs);

    // Show help and quit, if requested.
    if (args["help"] === true) {
      const HELP = `Usage: node removeExtraComponents.js [OPTION]
-h, --help        Print this help and exit.
-d, --dry-run     Report what items would be removed, without removing them.
-s, --silent      Bypass confirmation prompt.

Removes components that exist outside of the package installation directory:
 * IBM i Connector library, based on config setting: "connectorLibrary"
 * IBM i STRTCPSVR instance configuration.

This script does not uninstall the package itself.
It is intended to be used before uninstalling the package via NPM.
`;
      console.log(HELP);
      process.exit(0);
    }

    // Get config.
    const deployDir = iutils.getDeployDir();
    if (!deployDir) {
      console.error("removeExtraComponents.js: Can't find deployment directory.");
      process.exit(1);
    }
    const configPath = iutils.getConfigPath();
    let config;
    try {
      config = require(configPath);
    }
    catch (error) {
      console.error("removeExtraComponents.js: Unable to read configuration file: " + configPath);
      console.error("removeExtraComponents.js:", error.message);
      process.exit(1);
    }

    let connectorLibrary, connectorIASP;
    let instances = [];
    const messages = [];
    if (IBMi) {
      // Get STRTCPSVR instance configs, if any.
      instances = iutils.getIBMiInstances(deployDir);
      for (const instance of instances) {
        messages.push("IBM i STRTCPSVR instance configuration " + instance.name);
      }

      // Get Connector library details, if any.
      connectorLibrary = config.connectorLibrary;
      connectorIASP = config.connectorIASP;
      if (connectorIASP === undefined) {
        connectorIASP = "*SYSBAS";
      }
      if (connectorLibrary !== undefined) {
        let exists = false;
        try {
          // Determine if library exists.
          // This is a weird way to do it...
          // This allows us to check for the library even if the IASP is not mounted to the IFS and not in the job current ASP group.
          execCL(`qsys/dsplib lib(${connectorLibrary}) aspdev(${connectorIASP}) output(*)`, true);
          exists = true;
        }
        catch (error) {
          let handle = false;
          if (error.stderr) {
            const match = error.stderr.toString().match(/^(CPF.{4}): /);
            if (match) {
              const msgid = match[1];
              handle = (msgid === "CPF2110"); // Library not found.
            }
          }
          if (!handle) {
            throw error;
          }
        }
        if (exists) {
          messages.push("IBM i Connector library " + connectorLibrary + " in ASP device " + connectorIASP);
        }
        else {
          connectorLibrary = connectorIASP = undefined;
        }
      }
    }

    // Report and quit, if requested.
    if (args["dry-run"] === true) {
      for (const message of messages) {
        console.log(message);
      }
      process.exit(0);
    }

    if (messages.length === 0) {
      console.log("No additional components to remove.");
      process.exit(0);
    }

    if (args["silent"] !== true) {
      // Confirm removal.
      console.log("The following items will be removed:\n");
      for (const message of messages) {
        console.log(message);
      }
      let answer = await new Promise(resolve => {
        const readlineInterface = readline.createInterface({
          input: process.stdin,
          output: process.stdout,
          terminal: false
        });
        readlineInterface.question("\nAre you sure you want to proceed (y/n)? ", function(answer) {
          readlineInterface.close();
          resolve(answer);
        });
      });
      answer = answer.trim().toLowerCase();
      if (answer === "") {
        answer = "n";
      }
      if (answer !== "y") {
        console.log("Removal of extra components canceled.");
        process.exit(0);
      }
    }

    for (const instance of instances) {
      execCL(`QSYS/ENDTCPSVR SERVER(*PJS) INSTANCE(${instance.name})`);
      // This should generally work as shutdown is relatively fast.
      await new Promise(resolve => setTimeout(resolve, 10000));
      exec(`/usr/bin/rm -rf '/profoundjs-base/instances/${instance.name}'`);
    }
    if (connectorLibrary !== undefined) {
      execCL(`qsys/dltlib lib(${connectorLibrary}) aspdev(${connectorIASP})`);
    }
    console.log("Removal of extra components complete.");
    process.stdin.destroy();
  }
  catch (error) {
    process.stdin.destroy();
    console.error(error);
    process.exit(1);
  }
})();

function execCL(command, quiet) {
  command = `/usr/bin/system '${escapeQuotes(command)}'`;
  return exec(command, quiet);
  function escapeQuotes(input) {
    return input.replace(/'/g, "'\\''");
  }
}

function exec(command, quiet = false) {
  if (quiet !== true) {
    console.log("Executing command:", command);
  }
  const opts = {
    env: {
      QIBM_USE_DESCRIPTOR_STDIO: "Y",
      QIBM_MULTI_THREADED: "N"
    },
    stdio: "pipe",
    windowsHide: true
  };
  return child_process.execSync(command, opts).toString();
}