A PHP script, run from the command line, which parses cookbooks' metadata.rb files for dependencies and git clones them. Just drop it next to the cookbooks/ folder and run php git-cookbooks.php

git-cookbooks

<?php

$gitCookbookUrls = 'https://gist.githubusercontent.com/SamuelDavis/40f12c099f2c6ce19848/raw/36a3e32e4771b09f08cf5b91404ac85e68d21f5a/git-cookbook-urls.json';
$cookbookUrls = json_decode(file_get_contents($gitCookbookUrls), TRUE);

$existingCookbooks = scandir('./cookbooks');

if(!$existingCookbooks) {
  die("No existing cookbooks found.\n");
}

foreach($existingCookbooks as $cookbook) {
  if($cookbook !== '.' && $cookbook !== '..') {
    getDepenencies($cookbook);
  }
}
 
function getDepenencies($cookbook)
{
  $metaFile = "./cookbooks/$cookbook/metadata.rb";
  if(is_file($metaFile)) {
    preg_match_all("/depends +['|\"]([a-zA-Z0-9-_]+)['|\"]/", file_get_contents($metaFile), $matches);
    if($matches[1]) {
      foreach($matches[1] as $dependency) {
        gitCookbook($dependency);
      }   
    }   
    else {
      echo "Cookbook $cookbook has no dependencies\n";
    }   
  }
  else {
    echo "Cookbook $cookbook has no metadata.rb\n";
  }
}
 
function gitCookbook($cookbook)
{
  global $cookbookUrls;
 
  if(!array_key_exists($cookbook, $cookbookUrls)) {
    echo "$cookbook has no git url\n";
    return null;
  }
 
  $url = $cookbookUrls[$cookbook];
  $dir = "./cookbooks/$cookbook";
 
  if(is_dir($dir)) {
    echo "$dir directory already exists\n";
  }
  else {
    $cmd = "git clone $url cookbooks/$cookbook";
    shell_exec($cmd);
  }
 
  getDepenencies($cookbook);
}