Connect to a one-click-loaner shell using local terminal emulator.

README.md

How to use this

1. Find a task on treeherder
2. Use the "inspect-task" link to get to the task-inspector
3. Use the "one-click-loaner" link to get a loaner task
4. Click the taskId of the loaner task
5. List artifacts
6. Find "private/docker-worker/shell.html"
7. Right click and copy URL (ensure that you are logged into the tools.taskcluster.net with an LDAP user with commit level 1)
8. Run npm install
9. Run node shell.js <URL>

Happy hacking.

package.json

{
  "private": true,
  "dependencies": {
    "docker-exec-websocket-server": "^1.3.1"
  }
}

shell.js

let https = require('https')
let URL = require('url');
let querystring = require('querystring');
let DockerClient = require('docker-exec-websocket-server').DockerExecClient;

https.get(process.argv[2], res => {
  if (res.statusCode != 303) {
    console.log("Bad request");
  }
  let socketUrl = querystring.parse(URL.parse(res.headers.location).query).socketUrl;
  
  let client = new DockerClient({
    url: socketUrl,
    tty: true,
    command: [
      'sh', '-c', [
        'if [ -f "/etc/taskcluster-motd" ]; then cat /etc/taskcluster-motd; fi;',
        'if [ -z "$TERM" ]; then export TERM=xterm; fi;',
        'if [ -z "$HOME" ]; then export HOME=/root; fi;',
        'if [ -z "$USER" ]; then export USER=root; fi;',
        'if [ -z "$LOGNAME" ]; then export LOGNAME=root; fi;',
        'if [ -z `which "$SHELL"` ]; then export SHELL=bash; fi;',
        'if [ -z `which "$SHELL"` ]; then export SHELL=sh; fi;',
        'if [ -z `which "$SHELL"` ]; then export SHELL="/.taskclusterutils/busybox sh"; fi;',
        'SPAWN="$SHELL";',
        'if [ "$SHELL" = "bash" ]; then SPAWN="bash -li"; fi;',
        'if [ -f "/bin/taskcluster-interactive-shell" ]; then SPAWN="/bin/taskcluster-interactive-shell"; fi;',
        'exec $SPAWN;'
      ].join('')
    ]
  });

  client.execute().then(() => {
    process.stdin.setRawMode(true);
    process.on('exit', () => {
      process.stdin.setRawMode(false);
    });
    process.stdout.on('resize', () => {
      client.resize(process.stdout.rows, process.stdout.columns);
    });
    process.stdin.pipe(client.stdin);
    client.stdout.pipe(process.stdout);
    client.stderr.pipe(process.stderr);
    client.on('exit', (exitCode) => {
      process.exit(exitCode);
    });
    client.resize(process.stdout.rows, process.stdout.columns);
  }).catch(err => {
    console.log("Error: %s", err);
  });
});