/**
* Verify git version
*
* Verify hat the version of the installed GIT binary is at least 1.6. Will
* throw an exception, if the binary is not available or too old.
*
* @return void
*/
protected static function checkVersion()
{
if (self::$checked === true) {
return true;
}
$process = new pbsSystemProcess('env');
$process->nonZeroExitCodeException = true;
$process->argument('hg')->argument('--version')->execute();
if (!preg_match('/\\(version (.*)\\)/', $process->stdoutOutput, $match)) {
throw new vcsRuntimeException('Could not determine Mercurial version.');
}
if (version_compare($match[1], '1.3', '>=')) {
return self::$checked = true;
}
throw new vcsRuntimeException('Mercurial is required in a minimum version of 1.3.');
}