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rARC/src/filesystem/binary/PhutilMercurialBinaryAnalyzer.php
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PhutilMercurialBinaryAnalyzer.php
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<?php
final class PhutilMercurialBinaryAnalyzer
extends PhutilBinaryAnalyzer {
const BINARY = 'hg';
const CAPABILITY_FILES = 'files';
const CAPABILITY_INJECTION = 'injection';
protected function newBinaryVersion() {
$future = id(new ExecFuture('hg --version --quiet'))
->setEnv(
array(
'HGPLAIN' => 1,
));
list($err, $stdout) = $future->resolve();
if ($err) {
return null;
}
return self::parseMercurialBinaryVersion($stdout);
}
public static function parseMercurialBinaryVersion($stdout) {
// NOTE: At least on OSX, recent versions of Mercurial report this
// string in this format:
//
// Mercurial Distributed SCM (version 3.1.1+20140916)
$matches = null;
$pattern = '/^Mercurial Distributed SCM \(version ([\d.]+)/m';
if (preg_match($pattern, $stdout, $matches)) {
return $matches[1];
}
return null;
}
/**
* The `locate` command is deprecated as of Mercurial 3.2, to be replaced
* with `files` command, which supports most of the same arguments. This
* determines whether the new `files` command should be used instead of
* the `locate` command.
*
* @return boolean True if the version of Mercurial is new enough to support
* the `files` command, or false if otherwise.
*/
public function isMercurialFilesCommandAvailable() {
return self::versionHasCapability(
$this->requireBinaryVersion(),
self::CAPABILITY_FILES);
}
public function isMercurialVulnerableToInjection() {
return self::versionHasCapability(
$this->requireBinaryVersion(),
self::CAPABILITY_INJECTION);
}
public static function versionHasCapability(
$mercurial_version,
$capability) {
switch ($capability) {
case self::CAPABILITY_FILES:
return version_compare($mercurial_version, '3.2', '>=');
case self::CAPABILITY_INJECTION:
return version_compare($mercurial_version, '3.2.4', '<');
default:
throw new Exception(
pht(
'Unknown Mercurial capability "%s".',
$capability));
}
}
}

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