hussh

HuSSH

HuSSH is a simple wrapper for ssh2 with only a few simple features:

• Connects when you give it work to do
• Always passes ENV vars (by prepending them to commands)
• Simplified interface for uploading, downloading
• Simplified methods for command execution:
  • buffering stdout/stderr
  • just waiting for exit code
• Optionally logs activity to a local file
• Tell the dog

If you need anything more complex than file upload/download and command execution, use ssh2 directly. If you don't need/want very simplified commands, use ssh2.

var hussh = require("hussh")
var client = hussh({
  host: "example.com",
  username: "foo",
  privateKey: require("fs").readFileSync("./my-secret.key")
}, {encoding: "utf-8"});

// upload a string to a remote file
client.uploadString("text for my file", "remote-file.txt", function(err){
  if ( ! err ) {
    // file contents uploaded
  }
});

// execute a command and save all buffered output
client.execBuffer("env", {MYENVVAR: "myenv-value"}, function(err, result){
  if ( ! err ) {
    // command exit status is 0, access result.stdout and result.stderr here
  }
  else {
    // command had non-zero exit status... see what happened
    console.error(err.message)
  }
});

Instantiation

var client = hussh(sshOptions, moreOptions);

• sshOptions: these are passed directly to ssh2.connect
  • username: if not set, will be set according to precedence:
    • moreOptions.username
    • process.env.USER
    • "root"
  • host: if not set, will be set according to precedence:
    • moreOptions.hostname
    • moreOptions.host
    • "localhost"
  • All other options (such as privateKey) check ssh2 docs.
• moreOptions: these only affect hussh, not ssh2 (except as noted above)
  • env: ENV vars to include for all further commands
  • encoding: sets encoding for local log file, uploadString() method
  • logStream: WriteableStream for logging hussh instance activity
  • logFile: (only when logStream absent) file to log activity

Command Execution

client.exec(command, env, callback);
client.execBuffer(command, env, callback);
client.execStatus(command, env, callback);

• command: (String) command, including arguments
• env: (Object) if given, the environment variables will be set (prepended to command in KEY=value style)
• callback: (Function) called with the following:
  • err: null if OK, Error object otherwise
  • result: type depends the method used:
    • exec: ssh2 Channel (just like calling ssh2.Client.exec)
    • execBuffer: object with stdout and stderr Strings or Buffers
    • execStatus: result is omitted (undefined)

File Upload/Download

client.uploadString(stringData, remoteFile, callback);
client.upload(localFile, remoteFile, callback);
client.download(remoteFile, localFile, callback);

These are all just shortcuts which create an SFTP session, handle streams, and call the callback (receives Error on failure).