bin/givi

   1 #!/usr/bin/env php
   2 <?php
   3
   4 // This is the minimalist denialist implementation that doesn't check it's
   5 // pre-conditions and will screw up if you don't know what you're doing.
   6
   7 /**
   8  * Manage the current working directory as a stack.
   9  */
  10 class DirStack {
  11   protected $dirs;
  12
  13   /**
  14    * @param array $dirs
  15    */
  16   function __construct($dirs = array()) {
  17     $this->dirs = $dirs;
  18   }
  19
  20   /**
  21    * @param $dir
  22    *
  23    * @throws Exception
  24    */
  25   function push($dir) {
  26     $this->dirs[] = getcwd();
  27     if (!chdir($dir)) {
  28       throw new Exception("Failed to chdir($dir)");
  29     }
  30   }
  31
  32   function pop() {
  33     $oldDir = array_pop($this->dirs);
  34     chdir($oldDir);
  35   }
  36 }
  37
  38 /**
  39  * FIXME: Why am I doing this? Can't we get a proper build-system for little
  40  * CLI tools -- and then use prepackaged libraries?
  41  */
  42 class PullRequest {
  43
  44   /**
  45    * Given a link to a pull-request, determine which local repo
  46    * it applies to and fetch any metadata.
  47    *
  48    * @param string $url
  49    * @param array $repos list of locally known repos
  50    * @return PullRequest|NULL
  51    */
  52   public static function get($url, $repos) {
  53     foreach ($repos as $repo => $relPath) {
  54       if (preg_match("/^https:\/\/github.com\/(.*)\/(civicrm-{$repo})\/pull\/([0-9]+)(|\/commits|\/files)$/", $url, $matches)) {
  55         list ($full, $githubUser, $githubRepo, $githubPr) = $matches;
  56
  57         $pr = new PullRequest();
  58         $pr->repo = $repo;
  59         $pr->data = HttpClient::getJson("https://api.github.com/repos/$githubUser/$githubRepo/pulls/$githubPr");
  60         if (empty($pr->data)) {
  61           return NULL;
  62         }
  63
  64         return $pr;
  65       }
  66     }
  67     return NULL;
  68   }
  69
  70   /**
  71    * @var string local repo name e.g. "core", "drupal"
  72    */
  73   public $repo;
  74
  75   protected $data;
  76
  77   /**
  78    * @return mixed
  79    */
  80   public function getNumber() {
  81     return $this->data->number;
  82   }
  83
  84   /**
  85    * @return string name of the branch on the requestor's repo
  86    */
  87   public function getRequestorBranch() {
  88     return $this->data->head->ref;
  89   }
  90
  91   /**
  92    * @return string URL of the requestor's repo
  93    */
  94   public function getRequestorRepoUrl() {
  95     return $this->data->head->repo->git_url;
  96   }
  97 }
  98
  99 /**
 100  * Class Givi
 101  */
 102 class Givi {
 103
 104   /**
 105    * @var string 'checkout', 'begin', 'help', etc
 106    */
 107   protected $action;
 108
 109   /**
 110    * @var string
 111    */
 112   protected $baseBranch;
 113
 114   /**
 115    * @var array ($repoName => $gitRef)
 116    */
 117   protected $branches;
 118
 119   /**
 120    * @var string
 121    */
 122   protected $civiRoot = '.';
 123
 124   /**
 125    * @var int
 126    */
 127   protected $drupalVersion = 7;
 128
 129   /**
 130    * @var bool
 131    */
 132   protected $dryRun = FALSE;
 133
 134   /**
 135    * @var bool
 136    */
 137   protected $fetch = FALSE;
 138
 139   /**
 140    * @var bool
 141    */
 142   protected $force = FALSE;
 143
 144   /**
 145    * @var bool
 146    */
 147   protected $rebase = FALSE;
 148
 149   /**
 150    * @var string, the word 'all' or comma-delimited list of repo names
 151    */
 152   protected $repoFilter = 'all';
 153
 154   /**
 155    * @var array ($repoName => $relPath)
 156    */
 157   protected $repos;
 158
 159   /**
 160    * @var bool
 161    */
 162   protected $useGencode = FALSE;
 163
 164   /**
 165    * @var bool
 166    */
 167   protected $useSetup = FALSE;
 168
 169   /**
 170    * @var array, non-hyphenated arguments after the basedir
 171    */
 172   protected $arguments;
 173
 174   /**
 175    * @var string, the name of this program
 176    */
 177   protected $program;
 178
 179   /**
 180    * @var DirStack
 181    */
 182   protected $dirStack;
 183
 184   /**
 185    *
 186    */
 187   function __construct() {
 188     $this->dirStack = new DirStack();
 189     $this->repos = array(
 190       'core' => '.',
 191       'drupal' => 'drupal',
 192       'joomla' => 'joomla',
 193       'packages' => 'packages',
 194       'wordpress' => 'WordPress',
 195     );
 196   }
 197
 198   /**
 199    * @param $args
 200    *
 201    * @throws Exception
 202    */
 203   function main($args) {
 204     if (!$this->parseOptions($args)) {
 205       printf("Error parsing arguments\n");
 206       $this->doHelp();
 207       return FALSE;
 208     }
 209
 210     // All operations relative to civiRoot
 211     $this->dirStack->push($this->civiRoot);
 212
 213     // Filter branch list based on what repos actually exist
 214     foreach (array_keys($this->repos) as $repo) {
 215       if (!is_dir($this->repos[$repo])) {
 216         unset($this->repos[$repo]);
 217       }
 218     }
 219     if (!isset($this->repos['core']) || !isset($this->repos['packages'])) {
 220       return $this->returnError("Root appears to be invalid -- missing too many repos. Try --root=<dir>\n");
 221     }
 222
 223     $this->repos = $this->filterRepos($this->repoFilter, $this->repos);
 224
 225     // Run the action
 226     switch ($this->action) {
 227       case 'checkout':
 228         call_user_func_array(array($this, 'doCheckoutAll'), $this->arguments);
 229         break;
 230       case 'fetch':
 231         call_user_func_array(array($this, 'doFetchAll'), $this->arguments);
 232         break;
 233       case 'status':
 234         call_user_func_array(array($this, 'doStatusAll'), $this->arguments);
 235         break;
 236       case 'begin':
 237         call_user_func_array(array($this, 'doBegin'), $this->arguments);
 238         break;
 239       case 'resume':
 240         call_user_func_array(array($this, 'doResume'), $this->arguments);
 241         break;
 242       case 'review':
 243         call_user_func_array(array($this, 'doReview'), $this->arguments);
 244         break;
 245       //case 'merge-forward':
 246       //  call_user_func_array(array($this, 'doMergeForward'), $this->arguments);
 247       //  break;
 248       case 'push':
 249         call_user_func_array(array($this, 'doPush'), $this->arguments);
 250         break;
 251       case 'help':
 252       case '':
 253         $this->doHelp();
 254         break;
 255       default:
 256         return $this->returnError("unrecognized action: {$this->action}\n");
 257     }
 258
 259     if ($this->useSetup) {
 260       $this->run('core', $this->civiRoot . '/bin', 'bash', 'setup.sh');
 261     }
 262     elseif ($this->useGencode) {
 263       $this->run('core', $this->civiRoot . '/xml', 'php', 'GenCode.php');
 264     }
 265
 266     $this->dirStack->pop();
 267   }
 268
 269   /**
 270    * @param $args
 271    * @return bool
 272    */
 273   function parseOptions($args) {
 274     $this->branches = array();
 275     $this->arguments = array();
 276
 277     foreach ($args as $arg) {
 278       if ($arg == '--fetch') {
 279         $this->fetch = TRUE;
 280       }
 281       elseif ($arg == '--rebase') {
 282         $this->rebase = TRUE;
 283       }
 284       elseif ($arg == '--dry-run' || $arg == '-n') {
 285         $this->dryRun = TRUE;
 286       }
 287       elseif ($arg == '--force' || $arg == '-f') {
 288         $this->force = TRUE;
 289       }
 290       elseif ($arg == '--gencode') {
 291         $this->useGencode = TRUE;
 292       }
 293       elseif ($arg == '--setup') {
 294         $this->useSetup = TRUE;
 295       }
 296       elseif (preg_match('/^--d([678])/', $arg, $matches)) {
 297         $this->drupalVersion = $matches[1];
 298       }
 299       elseif (preg_match('/^--root=(.*)/', $arg, $matches)) {
 300         $this->civiRoot = $matches[1];
 301       }
 302       elseif (preg_match('/^--repos=(.*)/', $arg, $matches)) {
 303         $this->repoFilter = $matches[1];
 304       }
 305       elseif (preg_match('/^--(core|packages|joomla|drupal|wordpress)=(.*)/', $arg, $matches)) {
 306         $this->branches[$matches[1]] = $matches[2];
 307       }
 308       elseif (preg_match('/^-/', $arg)) {
 309         printf("unrecognized argument: %s\n", $arg);
 310         return FALSE;
 311       }
 312       else {
 313         $this->arguments[] = $arg;
 314       }
 315     }
 316
 317     $this->program = @array_shift($this->arguments);
 318     $this->action = @array_shift($this->arguments);
 319
 320     return TRUE;
 321   }
 322
 323   function doHelp() {
 324     $program = basename($this->program);
 325     echo "Givi - Coordinate git checkouts across CiviCRM repositories\n";
 326     echo "Scenario:\n";
 327     echo "  You have cloned and forked the CiviCRM repos. Each of the repos has two\n";
 328     echo "  remotes (origin + upstream). When working on a new PR, you generally want\n";
 329     echo "  to checkout official code (eg upstream/master) in all repos, but 1-2 repos\n";
 330     echo "  should use a custom branch (which tracks upstream/master).\n";
 331     echo "Usage:\n";
 332     echo "  $program [options] checkout <branch>\n";
 333     echo "  $program [options] fetch\n";
 334     echo "  $program [options] status\n";
 335     echo "  $program [options] begin <base-branch> [--core=<new-branch>|--drupal=<new-branch>|...] \n";
 336     echo "  $program [options] resume [--rebase] <base-branch> [--core=<custom-branch>|--drupal=<custom-branch>|...] \n";
 337     echo "  $program [options] review <base-branch> <pr-url-1> <pr-url-2>...\n";
 338     #echo "  $program [options] merge-forward <maintenace-branch> <development-branch>\n";
 339     #echo "  $program [options] push <remote> <branch>[:<branch>]\n";
 340     echo "Actions:\n";
 341     echo "  checkout: Checkout same branch name on all repos\n";
 342     echo "  fetch: Fetch remote changes on all repos\n";
 343     echo "  status: Display status on all repos\n";
 344     echo "  begin: Begin work on a new branch on some repo (and use base-branch for all others)\n";
 345     echo "  resume: Resume work on an existing branch on some repo (and use base-branch for all others)\n";
 346     echo "  review: Test work provided by someone else's pull-request. (If each repo has related PRs, then you can link to each of them.)\n";
 347     #echo "  merge-forward: On each repo, merge changes from maintenance branch to development branch\n";
 348     #echo "  push: On each repo, push a branch to a remote (Note: only intended for use with merge-forward)\n";
 349     echo "Common options:\n";
 350     echo "  --dry-run: Don't do anything; only print commands that would be run\n";
 351     echo "  --d6: Specify that Drupal branches should use 6.x-* prefixes\n";
 352     echo "  --d7: Specify that Drupal branches should use 7.x-* prefixes (default)\n";
 353     echo "  -f: When switching branches, proceed even if the index or the working tree differs from HEAD. This is used to throw away local changes.\n";
 354     echo "  --fetch: Fetch the latest code before creating, updating, or checking-out anything\n";
 355     echo "  --repos=X: Restrict operations to the listed repos (comma-delimited list) (default: all)";
 356     echo "  --root=X: Specify CiviCRM root directory (default: .)\n";
 357     echo "  --gencode: Run xml/GenCode after checking out code\n";
 358     echo "  --setup: Run bin/setup.sh (incl xml/GenCode) after checking out code\n";
 359     echo "Special options:\n";
 360     echo "  --core=X: Specify the branch to use on the core repository\n";
 361     echo "  --packages=X: Specify the branch to use on the packages repository\n";
 362     echo "  --drupal=X: Specify the branch to use on the drupal repository\n";
 363     echo "  --joomla=X: Specify the branch to use on the joomla repository\n";
 364     echo "  --wordpress=X: Specify the branch to use on the wordpress repository\n";
 365     echo "  --rebase: Perform a rebase before starting work\n";
 366     echo "Known repositories:\n";
 367     foreach ($this->repos as $repo => $relPath) {
 368       printf("  %-12s: %s\n", $repo, realpath($this->civiRoot . DIRECTORY_SEPARATOR . $relPath));
 369     }
 370     echo "When using 'begin' or 'resume' with a remote base-branch, most repositories\n";
 371     echo "will have a detached HEAD. Only repos with an explicit branch will be real,\n";
 372     echo "local branches.\n";
 373   }
 374
 375   /**
 376    * @param null $baseBranch
 377    *
 378    * @return bool
 379    */
 380   function doCheckoutAll($baseBranch = NULL) {
 381     if (!$baseBranch) {
 382       return $this->returnError("Missing <branch>\n");
 383     }
 384     $branches = $this->resolveBranches($baseBranch, $this->branches);
 385     if ($this->fetch) {
 386       $this->doFetchAll();
 387     }
 388
 389     foreach ($this->repos as $repo => $relPath) {
 390       $filteredBranch = $this->filterBranchName($repo, $branches[$repo]);
 391       $this->run($repo, $relPath, 'git', 'checkout', $filteredBranch, $this->force ? '-f' : NULL);
 392     }
 393     return TRUE;
 394   }
 395
 396   /**
 397    * @return bool
 398    */
 399   function doStatusAll() {
 400     foreach ($this->repos as $repo => $relPath) {
 401       $this->run($repo, $relPath, 'git', 'status');
 402     }
 403     return TRUE;
 404   }
 405
 406   /**
 407    * @param null $baseBranch
 408    *
 409    * @return bool
 410    */
 411   function doBegin($baseBranch = NULL) {
 412     if (!$baseBranch) {
 413       return $this->returnError("Missing <base-branch>\n");
 414     }
 415     if (empty($this->branches)) {
 416       return $this->returnError("Must specify a custom branch for at least one repository.\n");
 417     }
 418     $branches = $this->resolveBranches($baseBranch, $this->branches);
 419     if ($this->fetch) {
 420       $this->doFetchAll();
 421     }
 422
 423     foreach ($this->repos as $repo => $relPath) {
 424       $filteredBranch = $this->filterBranchName($repo, $branches[$repo]);
 425       $filteredBaseBranch = $this->filterBranchName($repo, $baseBranch);
 426
 427       if ($filteredBranch == $filteredBaseBranch) {
 428         $this->run($repo, $relPath, 'git', 'checkout', $filteredBranch, $this->force ? '-f' : NULL);
 429       }
 430       else {
 431         $this->run($repo, $relPath, 'git', 'checkout', '-b', $filteredBranch, $filteredBaseBranch, $this->force ? '-f' : NULL);
 432       }
 433     }
 434
 435     return TRUE;
 436   }
 437
 438   /**
 439    * @param null $baseBranch
 440    *
 441    * @return bool
 442    * @throws Exception
 443    */
 444   function doResume($baseBranch = NULL) {
 445     if (!$baseBranch) {
 446       return $this->returnError("Missing <base-branch>\n");
 447     }
 448     if (empty($this->branches)) {
 449       return $this->returnError("Must specify a custom branch for at least one repository.\n");
 450     }
 451     $branches = $this->resolveBranches($baseBranch, $this->branches);
 452     if ($this->fetch) {
 453       $this->doFetchAll();
 454     }
 455
 456     foreach ($this->repos as $repo => $relPath) {
 457       $filteredBranch = $this->filterBranchName($repo, $branches[$repo]);
 458       $filteredBaseBranch = $this->filterBranchName($repo, $baseBranch);
 459
 460       $this->run($repo, $relPath, 'git', 'checkout', $filteredBranch, $this->force ? '-f' : NULL);
 461       if ($filteredBranch != $filteredBaseBranch && $this->rebase) {
 462         list ($baseRemoteRepo, $baseRemoteBranch) = $this->parseBranchRepo($filteredBaseBranch);
 463         $this->run($repo, $relPath, 'git', 'pull', '--rebase', $baseRemoteRepo, $baseRemoteBranch);
 464       }
 465     }
 466
 467     return TRUE;
 468   }
 469
 470   /**
 471    * @param null $baseBranch
 472    *
 473    * @return bool
 474    */
 475   function doReview($baseBranch = NULL) {
 476     if (! $this->doCheckoutAll($baseBranch)) {
 477       return FALSE;
 478     }
 479
 480     $args = func_get_args();
 481     array_shift($args); // $baseBranch
 482
 483     $pullRequests = array();
 484     foreach ($args as $prUrl) {
 485       $pullRequest = PullRequest::get($prUrl, $this->repos);
 486       if ($pullRequest) {
 487         $pullRequests[] = $pullRequest;
 488       } else {
 489         return $this->returnError("Invalid pull-request URL: $prUrl");
 490       }
 491     }
 492
 493     foreach ($pullRequests as $pullRequest) {
 494       $repo = $pullRequest->repo;
 495       $branchName = 'pull-request-' . $pullRequest->getNumber();
 496       if ($this->hasLocalBranch($repo, $branchName)) {
 497         $this->run($repo, $this->repos[$repo], 'git', 'branch', '-D', $branchName);
 498       }
 499       $this->run($repo, $this->repos[$repo], 'git', 'checkout', '-b', $branchName); ## based on whatever was chosen by doCheckoutAll()
 500       $this->run($repo, $this->repos[$repo], 'git', 'pull', $pullRequest->getRequestorRepoUrl(), $pullRequest->getRequestorBranch());
 501     }
 502
 503     return TRUE;
 504   }
 505
 506   /*
 507
 508   If we want merge-forward changes to be subject to PR process, then this
 509   should useful.  Currently using a simpler process based on
 510   toosl/scripts/merge-forward
 511
 512   function doMergeForward($maintBranch, $devBranch) {
 513     if (!$maintBranch) {
 514       return $this->returnError("Missing <maintenace-base-branch>\n");
 515     }
 516     if (!$devBranch) {
 517       return $this->returnError("Missing <development-base-branch>\n");
 518     }
 519     list ($maintBranchRepo, $maintBranchName) = $this->parseBranchRepo($maintBranch);
 520     list ($devBranchRepo, $devBranchName) = $this->parseBranchRepo($devBranch);
 521
 522     $newBranchRepo = $devBranchRepo;
 523     $newBranchName = $maintBranchName . '-' . $devBranchName . '-' . date('Y-m-d-H-i-s');
 524
 525     if ($this->fetch) {
 526       $this->doFetchAll();
 527     }
 528
 529     foreach ($this->repos as $repo => $relPath) {
 530       $filteredMaintBranch = $this->filterBranchName($repo, $maintBranch);
 531       $filteredDevBranch = $this->filterBranchName($repo, $devBranch);
 532       $filteredNewBranchName = $this->filterBranchName($repo, $newBranchName);
 533
 534       $this->run($repo, $relPath, 'git', 'checkout', '-b', $filteredNewBranchName, $filteredDevBranch);
 535       $this->run($repo, $relPath, 'git', 'merge', $filteredMaintBranch);
 536     }
 537   }
 538   */
 539
 540   /**
 541    * @param $newBranchRepo
 542    * @param $newBranchNames
 543    *
 544    * @return bool
 545    */
 546   function doPush($newBranchRepo, $newBranchNames) {
 547     if (!$newBranchRepo) {
 548       return $this->returnError("Missing <remote>\n");
 549     }
 550     if (!$newBranchNames) {
 551       return $this->returnError("Missing <branch>[:<branch>]\n");
 552     }
 553     if (FALSE !== strpos($newBranchNames, ':')) {
 554       list ($newBranchFromName,$newBranchToName) = explode(':', $newBranchNames);
 555       foreach ($this->repos as $repo => $relPath) {
 556         $filteredFromName = $this->filterBranchName($repo, $newBranchFromName);
 557         $filteredToName = $this->filterBranchName($repo, $newBranchToName);
 558
 559         $this->run($repo, $relPath, 'git', 'push', $newBranchRepo, $filteredFromName . ':' . $filteredToName);
 560       }
 561     } else {
 562       foreach ($this->repos as $repo => $relPath) {
 563         $filteredName = $this->filterBranchName($repo, $newBranchNames);
 564         $this->run($repo, $relPath, 'git', 'push', $newBranchRepo, $filteredName);
 565       }
 566     }
 567
 568     return TRUE;
 569   }
 570
 571   /**
 572    * Determine if a branch exists locally
 573    *
 574    * @param string $repo
 575    * @param string $name branch name
 576    * @return bool
 577    */
 578   function hasLocalBranch($repo, $name) {
 579     $path = $this->repos[$repo] . '/.git/refs/heads/' . $name;
 580     return file_exists($path);
 581   }
 582
 583   /**
 584    * Given a ref name, determine the repo and branch
 585    *
 586    * FIXME: only supports $refs like "foo" (implicit origin) or "myremote/foo"
 587    *
 588    * @param $ref
 589    * @param string $defaultRemote
 590    *
 591    * @throws Exception
 592    * @return array
 593    */
 594   function parseBranchRepo($ref, $defaultRemote = 'origin') {
 595     $parts = explode('/', $ref);
 596     if (count($parts) == 1) {
 597       return array($defaultRemote, $parts[1]);
 598     }
 599     elseif (count($parts) == 2) {
 600       return $parts;
 601     }
 602     else {
 603       throw new Exception("Failed to parse branch name ($ref)");
 604     }
 605   }
 606
 607   /**
 608    * Run a command
 609    *
 610    * Any items after $command will be escaped and added to $command
 611    *
 612    * @param $repoName
 613    * @param string $runDir
 614    * @param string $command
 615    *
 616    * @return string
 617    */
 618   function run($repoName, $runDir, $command) {
 619     $this->dirStack->push($runDir);
 620
 621     $args = func_get_args();
 622     array_shift($args);
 623     array_shift($args);
 624     array_shift($args);
 625     foreach ($args as $arg) {
 626       if ($arg !== NULL) {
 627         $command .= ' ' . escapeshellarg($arg);
 628       }
 629     }
 630     printf("\n\n\nRUN [%s]: %s\n", $repoName, $command);
 631     if ($this->dryRun) {
 632       $r = NULL;
 633     } else {
 634       $r = system($command);
 635     }
 636
 637     $this->dirStack->pop();
 638     return $r;
 639   }
 640
 641   function doFetchAll() {
 642     foreach ($this->repos as $repo => $relPath) {
 643       $this->run($repo, $relPath, 'git', 'fetch', '--all');
 644     }
 645   }
 646
 647   /**
 648    * @param string $default branch to use by default
 649    * @param $overrides
 650    *
 651    * @return array ($repoName => $gitRef)
 652    */
 653   function resolveBranches($default, $overrides) {
 654     $branches = $overrides;
 655     foreach ($this->repos as $repo => $relPath) {
 656       if (!isset($branches[$repo])) {
 657         $branches[$repo] = $default;
 658       }
 659     }
 660     return $branches;
 661   }
 662
 663   /**
 664    * @param $repoName
 665    * @param $branchName
 666    *
 667    * @return string
 668    */
 669   function filterBranchName($repoName, $branchName) {
 670     if ($branchName == '') {
 671       return '';
 672     }
 673     if ($repoName == 'drupal') {
 674       $parts = explode('/', $branchName);
 675       $last = $this->drupalVersion . '.x-' . array_pop($parts);
 676       array_push($parts, $last);
 677       return implode('/', $parts);
 678     }
 679     return $branchName;
 680   }
 681
 682   /**
 683    * @param string $filter e.g. "all" or "repo1,repo2"
 684    * @param array $repos ($repoName => $repoDir)
 685    *
 686    * @throws Exception
 687    * @return array ($repoName => $repoDir)
 688    */
 689   function filterRepos($filter, $repos) {
 690     if ($filter == 'all') {
 691       return $repos;
 692     }
 693
 694     $inclRepos = explode(',', $filter);
 695     $unknowns = array_diff($inclRepos, array_keys($repos));
 696     if (!empty($unknowns)) {
 697       throw new Exception("Unknown Repos: " . implode(',', $unknowns));
 698     }
 699     $unwanted = array_diff(array_keys($repos), $inclRepos);
 700     foreach ($unwanted as $repo) {
 701       unset($repos[$repo]);
 702     }
 703     return $repos;
 704   }
 705
 706   /**
 707    * @param $message
 708    *
 709    * @return bool
 710    */
 711   function returnError($message) {
 712     echo "\nERROR: ", $message, "\n\n";
 713     $this->doHelp();
 714     return FALSE;
 715   }
 716 }
 717
 718 /**
 719  * Class HttpClient
 720  */
 721 class HttpClient {
 722   /**
 723    * @param $url
 724    * @param $file
 725    *
 726    * @return bool
 727    */
 728   static function download($url, $file) {
 729     // PHP native client is unreliable PITA for HTTPS
 730     if (exec("which wget")) {
 731       self::run('wget', '-q', '-O', $file, $url);
 732     } elseif (exec("which curl")) {
 733       self::run('curl', '-o', $file, $url);
 734     }
 735
 736     // FIXME: really detect errors
 737     return TRUE;
 738   }
 739
 740   /**
 741    * @param $url
 742    *
 743    * @return mixed
 744    */
 745   static function getJson($url) {
 746     $file = tempnam(sys_get_temp_dir(), 'givi-json-');
 747     HttpClient::download($url, $file);
 748     $data = json_decode(file_get_contents($file));
 749     unlink($file);
 750     return $data;
 751   }
 752
 753   /**
 754    * Run a command
 755    *
 756    * Any items after $command will be escaped and added to $command
 757    *
 758    * @param string $command
 759    *
 760    * @internal param string $runDir
 761    * @return string
 762    */
 763   static function run($command) {
 764     $args = func_get_args();
 765     array_shift($args);
 766     foreach ($args as $arg) {
 767       $command .= ' ' . escapeshellarg($arg);
 768     }
 769     printf("\n\n\nRUN: %s\n", $command);
 770     $r = system($command);
 771
 772     return $r;
 773   }
 774 }
 775
 776 $givi = new Givi();
 777 $givi->main($argv);