DrydockSSHInterface.php
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	<?php

	final class DrydockSSHCommandInterface extends DrydockCommandInterface {

	private $passphraseSSHKey;
	private $connectTimeout;
	private $execTimeout;

	private function openCredentialsIfNotOpen() {
	if ($this->passphraseSSHKey !== null) {
	return;
	}

	$credential = id(new PassphraseCredentialQuery())
	->setViewer(PhabricatorUser::getOmnipotentUser())
	->withIDs(array($this->getConfig('credential')))
	->needSecrets(true)
	->executeOne();

	if ($credential->getProvidesType() !==
	PassphraseCredentialTypeSSHPrivateKey::PROVIDES_TYPE) {
	throw new Exception('Only private key credentials are supported.');
	}

	$this->passphraseSSHKey = PassphraseSSHKey::loadFromPHID(
	$credential->getPHID(),
	PhabricatorUser::getOmnipotentUser());
	}

	public function setConnectTimeout($timeout) {
	$this->connectTimeout = $timeout;
	return $this;
	}

	public function setExecTimeout($timeout) {
	$this->execTimeout = $timeout;
	return $this;
	}

	public function getExecFuture($command) {
	$this->openCredentialsIfNotOpen();

	$argv = func_get_args();

	if ($this->getConfig('platform') === 'windows') {

	$escape_mode = null;
	$command_line = null;

	switch ($this->getEscapingMode()) {
	case PhutilCommandString::MODE_WINDOWSCMD:
	case PhutilCommandString::MODE_BASH:
	$escape_mode = PhutilCommandString::MODE_POWERSHELL;
	$command_line = 'iex $original_command';
	break;
	case PhutilCommandString::MODE_POWERSHELL:
	$escape_mode = PhutilCommandString::MODE_POWERSHELL;
	$command_line = <<<EOF

	# Encode the command as base64...
	\$bytes_command = [System.Text.Encoding]::Unicode.GetBytes(\$original_command)
	\$encoded_command = [Convert]::ToBase64String(\$bytes_command)

	C:\\Windows\\system32\\WindowsPowerShell\\v1.0\\powershell.exe `
	-NonInteractive `
	-OutputFormat Text `
	-EncodedCommand \$encoded_command
	EOF;
	break;
	default:
	throw new Exception(pht(
	'Unknown shell %s',
	$this->getShell()));
	}

	// Handle Windows by executing the command under PowerShell.
	$command = id(new PhutilCommandString($argv))
	->setEscapingMode($escape_mode);

	$encapsulate_command = array('%s', (string)$command);
	$double_command = id(new PhutilCommandString($encapsulate_command))
	->setEscapingMode(PhutilCommandString::MODE_POWERSHELL);

	$change_directory = '';
	if ($this->getWorkingDirectory() !== null) {
	$change_directory .= 'cd '.$this->getWorkingDirectory();
	}

	$script = <<<EOF
	\$ErrorActionPreference = 'Continue'
	\$host.UI.RawUI.BufferSize = `
	New-Object System.Management.Automation.Host.Size(512,50)

	\$s = New-PSSession localhost
	while (\$s -eq \$null) {
	# Occasionally Windows fails to authenticate the current user as
	# themselves.
	Write-Error `
	"Failure to create session in New-PSSession. Retrying..."
	Sleep 5

	\$s = New-PSSession localhost
	}
	\$real_env = Invoke-Command -Session \$s -ErrorAction Continue -ScriptBlock {
	dir Env:\\
	}
	Remove-PSSession \$s
	foreach (\$entry in (dir Env:\\)) {
	\$keyname = ("env:" + \$entry.Name)
	Remove-Item -Path \$keyname
	}
	foreach (\$entry in \$real_env) {
	\$keyname = ("env:" + \$entry.Name)
	\$keyval = \$entry.Value
	Set-Item -Path \$keyname -Value \$keyval
	}

	$change_directory

	\$original_command = $double_command

	# Run powershell from itself to get a "standard" exit code. This still
	# doesn't actually catch every kind of error :(
	$command_line
	exit \$LastExitCode
	EOF;

	// When Microsoft says "Unicode" they don't mean UTF-8.
	$script = mb_convert_encoding($script, 'UTF-16LE');

	$script = base64_encode($script);

	$powershell =
	'C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe';
	$powershell .=
	' -ExecutionPolicy Bypass'.
	' -NonInteractive'.
	' -InputFormat Text'.
	' -OutputFormat Text'.
	' -EncodedCommand '.$script;

	$full_command = $powershell;
	} else {
	// Handle UNIX by executing under the native shell.
	$argv = $this->applyWorkingDirectoryToArgv($argv);

	$full_command = call_user_func_array('csprintf', $argv);
	}

	$command_timeout = '';
	if ($this->connectTimeout !== null) {
	$command_timeout = csprintf(
	'-o %s',
	'ConnectTimeout='.$this->connectTimeout);
	}

	$future = new ExecFuture(
	'ssh '.
	'-o LogLevel=quiet '.
	'-o StrictHostKeyChecking=no '.
	'-o UserKnownHostsFile=/dev/null '.
	'-o BatchMode=yes '.
	'%C -p %s -i %P %P@%s -- %s',
	$command_timeout,
	$this->getConfig('port'),
	$this->passphraseSSHKey->getKeyfileEnvelope(),
	$this->passphraseSSHKey->getUsernameEnvelope(),
	$this->getConfig('host'),
	$full_command);
	$future->setTimeout($this->execTimeout);
	$future->setPowershellXML($this->getConfig('platform') === 'windows');
	return $future;
	}
	}

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	hach-que
	Sep 25 2014, 8:22 AM

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