Updating mozdownload (excluding tests)

mozdownload/scraper.py

-#!/usr/bin/env python
-
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-"""Module to handle downloads for different types of Firefox and Thunderbird builds."""
-
-
 from datetime import datetime
-from optparse import OptionParser, OptionGroup
+import logging
 import os
 import re
+import requests
 import sys
 import time
 import urllib
-import urllib2
+from urlparse import urlparse
 
 import mozinfo
 
+import errors
+
 from parser import DirectoryParser
 from timezones import PacificTimezone
-
-
-APPLICATIONS = ['b2g', 'firefox', 'thunderbird']
+from utils import urljoin
+
+
+APPLICATIONS = ('b2g', 'firefox', 'fennec', 'thunderbird')
+
+# Some applications contain all locales in a single build
+APPLICATIONS_MULTI_LOCALE = ('b2g', 'fennec')
+
+# Used if the application is named differently than the subfolder on the server
+APPLICATIONS_TO_FTP_DIRECTORY = {'fennec': 'mobile'}
 
 # Base URL for the path to all builds
-BASE_URL = 'https://ftp.mozilla.org/pub/mozilla.org'
-
-PLATFORM_FRAGMENTS = {'linux': 'linux-i686',
-                      'linux64': 'linux-x86_64',
-                      'mac': 'mac',
-                      'mac64': 'mac64',
-                      'win32': 'win32',
-                      'win64': 'win64-x86_64'}
-
-DEFAULT_FILE_EXTENSIONS = {'linux': 'tar.bz2',
+BASE_URL = 'https://archive.mozilla.org/pub/'
+
+# Chunk size when downloading a file
+CHUNK_SIZE = 16 * 1024
+
+DEFAULT_FILE_EXTENSIONS = {'android-api-9': 'apk',
+                           'android-api-11': 'apk',
+                           'android-x86': 'apk',
+                           'linux': 'tar.bz2',
                            'linux64': 'tar.bz2',
                            'mac': 'dmg',
                            'mac64': 'dmg',
                            'win32': 'exe',
                            'win64': 'exe'}
 
-class NotFoundException(Exception):
-    """Exception for a resource not being found (e.g. no logs)"""
-    def __init__(self, message, location):
-        self.location = location
-        Exception.__init__(self, ': '.join([message, location]))
+PLATFORM_FRAGMENTS = {'android-api-9': r'android-arm',
+                      'android-api-11': r'android-arm',
+                      'android-x86': r'android-i386',
+                      'linux': r'linux-i686',
+                      'linux64': r'linux-x86_64',
+                      'mac': r'mac',
+                      'mac64': r'mac(64)?',
+                      'win32': r'win32',
+                      'win64': r'win64(-x86_64)?'}
 
 
 class Scraper(object):
     """Generic class to download an application from the Mozilla server"""
 
-    def __init__(self, directory, version, platform=None,
-                 application='firefox', locale='en-US', extension=None,
-                 authentication=None, retry_attempts=3, retry_delay=10):
+    def __init__(self, destination=None, platform=None,
+                 application='firefox', locale=None, extension=None,
+                 username=None, password=None,
+                 retry_attempts=0, retry_delay=10.,
+                 is_stub_installer=False, timeout=None,
+                 log_level='INFO',
+                 base_url=BASE_URL):
 
         # Private properties for caching
-        self._target = None
+        self._filename = None
         self._binary = None
 
-        self.directory = directory
-        self.locale = locale
+        self.destination = destination or os.getcwd()
+
+        if not locale:
+            if application in APPLICATIONS_MULTI_LOCALE:
+                self.locale = 'multi'
+            else:
+                self.locale = 'en-US'
+        else:
+            self.locale = locale
+
         self.platform = platform or self.detect_platform()
-        self.version = version
-        self.extension = extension or DEFAULT_FILE_EXTENSIONS[self.platform]
-        self.authentication = authentication
+
+        self.session = requests.Session()
+        if (username, password) != (None, None):
+            self.session.auth = (username, password)
+
         self.retry_attempts = retry_attempts
         self.retry_delay = retry_delay
+        self.is_stub_installer = is_stub_installer
+        self.timeout_download = timeout
+        # this is the timeout used in requests.get. Unlike "auth",
+        # it does not work if we attach it on the session, so we handle
+        # it independently.
+        self.timeout_network = 60.
+
+        logging.basicConfig(format=' %(levelname)s | %(message)s')
+        self.logger = logging.getLogger(self.__module__)
+        self.logger.setLevel(log_level)
 
         # build the base URL
         self.application = application
-        self.base_url = '/'.join([BASE_URL, self.application])
-
+        self.base_url = '%s/' % urljoin(
+            base_url,
+            APPLICATIONS_TO_FTP_DIRECTORY.get(self.application, self.application)
+        )
+
+        if extension:
+            self.extension = extension
+        else:
+            if self.application in APPLICATIONS_MULTI_LOCALE and \
+                    self.platform in ('win32', 'win64'):
+                # builds for APPLICATIONS_MULTI_LOCALE only exist in zip
+                self.extension = 'zip'
+            else:
+                self.extension = DEFAULT_FILE_EXTENSIONS[self.platform]
+
+        attempt = 0
+        while True:
+            attempt += 1
+            try:
+                self.get_build_info()
+                break
+            except (errors.NotFoundError, requests.exceptions.RequestException), e:
+                if self.retry_attempts > 0:
+                    # Log only if multiple attempts are requested
+                    self.logger.warning("Build not found: '%s'" % e.message)
+                    self.logger.info('Will retry in %s seconds...' %
+                                     (self.retry_delay))
+                    time.sleep(self.retry_delay)
+                    self.logger.info("Retrying... (attempt %s)" % attempt)
+
+                if attempt >= self.retry_attempts:
+                    if hasattr(e, 'response') and \
+                            e.response.status_code == 404:
+                        message = "Specified build has not been found"
+                        raise errors.NotFoundError(message, e.response.url)
+                    else:
+                        raise
+
+    def _create_directory_parser(self, url):
+        return DirectoryParser(url,
+                               session=self.session,
+                               timeout=self.timeout_network)
 
     @property
     def binary(self):
         """Return the name of the build"""
 
-        if self._binary is None:
-            # Retrieve all entries from the remote virtual folder
-            parser = DirectoryParser(self.path)
-            if not parser.entries:
-                raise NotFoundException('No entries found', self.path)
-    
-            # Download the first matched directory entry
-            pattern = re.compile(self.binary_regex, re.IGNORECASE)
-            for entry in parser.entries:
-                try:
-                    self._binary = pattern.match(entry).group()
-                    break
-                except:
-                    # No match, continue with next entry
-                    continue
-
-        if self._binary is None:
-            raise NotFoundException("Binary not found in folder", self.path)
-        else:
-            return self._binary
-
+        attempt = 0
+
+        while self._binary is None:
+            attempt += 1
+            try:
+                # Retrieve all entries from the remote virtual folder
+                parser = self._create_directory_parser(self.path)
+                if not parser.entries:
+                    raise errors.NotFoundError('No entries found', self.path)
+
+                # Download the first matched directory entry
+                pattern = re.compile(self.binary_regex, re.IGNORECASE)
+                for entry in parser.entries:
+                    try:
+                        self._binary = pattern.match(entry).group()
+                        break
+                    except:
+                        # No match, continue with next entry
+                        continue
+                else:
+                    raise errors.NotFoundError("Binary not found in folder",
+                                               self.path)
+            except (errors.NotFoundError, requests.exceptions.RequestException), e:
+                if self.retry_attempts > 0:
+                    # Log only if multiple attempts are requested
+                    self.logger.warning("Build not found: '%s'" % e.message)
+                    self.logger.info('Will retry in %s seconds...' %
+                                     (self.retry_delay))
+                    time.sleep(self.retry_delay)
+                    self.logger.info("Retrying... (attempt %s)" % attempt)
+
+                if attempt >= self.retry_attempts:
+                    if hasattr(e, 'response') and \
+                            e.response.status_code == 404:
+                        message = "Specified build has not been found"
+                        raise errors.NotFoundError(message, self.path)
+                    else:
+                        raise
+
+        return self._binary
 
     @property
     def binary_regex(self):
         """Return the regex for the binary filename"""
 
-        raise NotImplementedError(sys._getframe(0).f_code.co_name)
-
-
-    @property
-    def final_url(self):
-        """Return the final URL of the build"""
-
-        return '/'.join([self.path, self.binary])
-
+        raise errors.NotImplementedError(sys._getframe(0).f_code.co_name)
+
+    @property
+    def url(self):
+        """Return the URL of the build"""
+
+        return urljoin(self.path, self.binary)
 
     @property
     def path(self):
-        """Return the path to the build"""
-
-        return '/'.join([self.base_url, self.path_regex])
-
+        """Return the path to the build folder"""
+
+        return urljoin(self.base_url, self.path_regex)
 
     @property
     def path_regex(self):
-        """Return the regex for the path to the build"""
-
-        raise NotImplementedError(sys._getframe(0).f_code.co_name)
-
+        """Return the regex for the path to the build folder"""
+
+        raise errors.NotImplementedError(sys._getframe(0).f_code.co_name)
 
     @property
     def platform_regex(self):
         """Return the platform fragment of the URL"""
 
-        return PLATFORM_FRAGMENTS[self.platform];
-
-
-    @property
-    def target(self):
-        """Return the target file name of the build"""
-
-        if self._target is None:
-            self._target = os.path.join(self.directory,
-                                        self.build_filename(self.binary))
-        return self._target
-
+        return PLATFORM_FRAGMENTS[self.platform]
+
+    @property
+    def filename(self):
+        """Return the local filename of the build"""
+
+        if self._filename is None:
+            if os.path.splitext(self.destination)[1]:
+                # If the filename has been given make use of it
+                target_file = self.destination
+            else:
+                # Otherwise create it from the build details
+                target_file = os.path.join(self.destination,
+                                           self.build_filename(self.binary))
+
+            self._filename = os.path.abspath(target_file)
+
+        return self._filename
+
+    def get_build_info(self):
+        """Returns additional build information in subclasses if necessary"""
+        pass
 
     def build_filename(self, binary):
         """Return the proposed filename with extension for the binary"""
 
-        raise NotImplementedError(sys._getframe(0).f_code.co_name)
-
+        raise errors.NotImplementedError(sys._getframe(0).f_code.co_name)
 
     def detect_platform(self):
         """Detect the current platform"""
 
         # For Mac and Linux 32bit we do not need the bits appended
-        if mozinfo.os == 'mac' or (mozinfo.os == 'linux' and mozinfo.bits == 32):
+        if mozinfo.os == 'mac' or \
+                (mozinfo.os == 'linux' and mozinfo.bits == 32):
             return mozinfo.os
         else:
             return "%s%d" % (mozinfo.os, mozinfo.bits)
 
-
     def download(self):
         """Download the specified file"""
 
-        attempts = 0
-
-        if not os.path.isdir(self.directory):
-            os.makedirs(self.directory)
+        def total_seconds(td):
+            # Keep backward compatibility with Python 2.6 which doesn't have
+            # this method
+            if hasattr(td, 'total_seconds'):
+                return td.total_seconds()
+            else:
+                return (td.microseconds +
+                        (td.seconds + td.days * 24 * 3600) * 10 ** 6) / 10 ** 6
+
+        attempt = 0
 
         # Don't re-download the file
-        if os.path.isfile(os.path.abspath(self.target)):
-            print "File has already been downloaded: %s" % (self.target)
-            return
-
-        print 'Downloading from: %s' % (urllib.unquote(self.final_url))
-        tmp_file = self.target + ".part"
-
-        if self.authentication \
-           and self.authentication['username'] \
-           and self.authentication['password']:
-            password_mgr = urllib2.HTTPPasswordMgrWithDefaultRealm()
-            password_mgr.add_password(None,
-                                      self.final_url,
-                                      self.authentication['username'],
-                                      self.authentication['password'])
-            handler = urllib2.HTTPBasicAuthHandler(password_mgr)
-            opener = urllib2.build_opener(urllib2.HTTPHandler, handler)
-            urllib2.install_opener(opener)
+        if os.path.isfile(os.path.abspath(self.filename)):
+            self.logger.info("File has already been downloaded: %s" %
+                             (self.filename))
+            return self.filename
+
+        directory = os.path.dirname(self.filename)
+        if not os.path.isdir(directory):
+            os.makedirs(directory)
+
+        self.logger.info('Downloading from: %s' %
+                         (urllib.unquote(self.url)))
+        self.logger.info('Saving as: %s' % self.filename)
+
+        tmp_file = self.filename + ".part"
 
         while True:
-            attempts += 1
+            attempt += 1
             try:
-                r = urllib2.urlopen(self.final_url)
-                CHUNK = 16 * 1024
+                start_time = datetime.now()
+
+                # Enable streaming mode so we can download content in chunks
+                r = self.session.get(self.url, stream=True)
+                r.raise_for_status()
+
+                content_length = r.headers.get('Content-length')
+                # ValueError: Value out of range if only total_size given
+                if content_length:
+                    total_size = int(content_length.strip())
+                    max_value = ((total_size / CHUNK_SIZE) + 1) * CHUNK_SIZE
+
+                bytes_downloaded = 0
+
                 with open(tmp_file, 'wb') as f:
-                    for chunk in iter(lambda: r.read(CHUNK), ''):
+                    for chunk in iter(lambda: r.raw.read(CHUNK_SIZE), ''):
                         f.write(chunk)
+                        bytes_downloaded += CHUNK_SIZE
+
+                        t1 = total_seconds(datetime.now() - start_time)
+                        if self.timeout_download and \
+                                t1 >= self.timeout_download:
+                            raise errors.TimeoutError
                 break
-            except (urllib2.HTTPError, urllib2.URLError):
+            except (requests.exceptions.RequestException, errors.TimeoutError), e:
                 if tmp_file and os.path.isfile(tmp_file):
                     os.remove(tmp_file)
-                print 'Download failed! Retrying... (attempt %s)' % attempts
-                if attempts >= self.retry_attempts:
+                if self.retry_attempts > 0:
+                    # Log only if multiple attempts are requested
+                    self.logger.warning('Download failed: "%s"' % str(e))
+                    self.logger.info('Will retry in %s seconds...' %
+                                     (self.retry_delay))
+                    time.sleep(self.retry_delay)
+                    self.logger.info("Retrying... (attempt %s)" % attempt)
+                if attempt >= self.retry_attempts:
                     raise
                 time.sleep(self.retry_delay)
 
-        os.rename(tmp_file, self.target)
+        os.rename(tmp_file, self.filename)
+
+        return self.filename
+
+    def show_matching_builds(self, builds):
+        """Output the matching builds"""
+        self.logger.info('Found %s build%s: %s' % (
+            len(builds),
+            len(builds) > 1 and 's' or '',
+            len(builds) > 10 and
+            ' ... '.join([', '.join(builds[:5]), ', '.join(builds[-5:])]) or
+            ', '.join(builds)))
 
 
 class DailyScraper(Scraper):
     """Class to download a daily build from the Mozilla server"""
 
     def __init__(self, branch='mozilla-central', build_id=None, date=None,
                  build_number=None, *args, **kwargs):
 
+        self.branch = branch
+        self.build_id = build_id
+        self.date = date
+        self.build_number = build_number
+
         Scraper.__init__(self, *args, **kwargs)
-        self.branch = branch
+
+    def get_build_info(self):
+        """Defines additional build information"""
 
         # Internally we access builds via index
-        if build_number is not None:
-            self.build_index = int(build_number) - 1
+        if self.build_number is not None:
+            self.build_index = int(self.build_number) - 1
         else:
             self.build_index = None
 
-        if build_id:
-            # A build id has been specified. Split up its components so the date
-            # and time can be extracted: '20111212042025' -> '2011-12-12 04:20:25'
-            self.date = datetime.strptime(build_id, '%Y%m%d%H%M%S')
-            self.builds, self.build_index = self.get_build_info_for_date(self.date,
-                                                                         has_time=True)
+        if self.build_id:
+            # A build id has been specified. Split up its components so the
+            # date and time can be extracted:
+            # '20111212042025' -> '2011-12-12 04:20:25'
+            self.date = datetime.strptime(self.build_id, '%Y%m%d%H%M%S')
 
-        elif date:
+        elif self.date:
             # A date (without time) has been specified. Use its value and the
             # build index to find the requested build for that day.
-            self.date = datetime.strptime(date, '%Y-%m-%d')
-            self.builds, self.build_index = self.get_build_info_for_date(self.date,
-                                                                         build_index=self.build_index)
-
+            try:
+                self.date = datetime.strptime(self.date, '%Y-%m-%d')
+            except:
+                raise ValueError('%s is not a valid date' % self.date)
         else:
-            # If no build id nor date have been specified the lastest available
+            # If no build id nor date have been specified the latest available
             # build of the given branch has to be identified. We also have to
             # retrieve the date of the build via its build id.
-            url = '%s/nightly/latest-%s/' % (self.base_url, self.branch)
+            self.date = self.get_latest_build_date()
 
-            print 'Retrieving the build status file from %s' % url
-            parser = DirectoryParser(url)
-            parser.entries = parser.filter(r'.*%s\.txt' % self.platform_regex)
-            if not parser.entries:
-                message = 'Status file for %s build cannot be found' % self.platform_regex
-                raise NotFoundException(message, url)
+        self.builds, self.build_index = self.get_build_info_for_date(
+            self.date, self.build_index)
 
-            # Read status file for the platform, retrieve build id, and convert to a date
-            status_file = url + parser.entries[-1]
-            f = urllib.urlopen(status_file)
-            self.date = datetime.strptime(f.readline().strip(), '%Y%m%d%H%M%S')
-            self.builds, self.build_index = self.get_build_info_for_date(self.date,
-                                                                         has_time=True)
+    def get_latest_build_date(self):
+        """ Returns date of latest available nightly build."""
+        if self.application not in ('fennec'):
+            url = urljoin(self.base_url, 'nightly', 'latest-%s/' % self.branch)
+        else:
+            url = urljoin(self.base_url, 'nightly', 'latest-%s-%s/' %
+                          (self.branch, self.platform))
 
+        self.logger.info('Retrieving the build status file from %s' % url)
+        parser = self._create_directory_parser(url)
+        parser.entries = parser.filter(r'.*%s\.txt' % self.platform_regex)
+        if not parser.entries:
+            message = 'Status file for %s build cannot be found' % \
+                self.platform_regex
+            raise errors.NotFoundError(message, url)
 
-    def get_build_info_for_date(self, date, has_time=False, build_index=None):
-        url = '/'.join([self.base_url, self.monthly_build_list_regex])
+        # Read status file for the platform, retrieve build id,
+        # and convert to a date
+        headers = {'Cache-Control': 'max-age=0'}
 
-        print 'Retrieving list of builds from %s' % url
-        parser = DirectoryParser(url)
-        regex = r'%(DATE)s-(\d+-)+%(BRANCH)s%(L10N)s$' % {
-                    'DATE': date.strftime('%Y-%m-%d'),
-                    'BRANCH': self.branch,
-                    'L10N': '' if self.locale == 'en-US' else '-l10n'}
+        r = self.session.get(url + parser.entries[-1], headers=headers)
+        try:
+            r.raise_for_status()
+
+            return datetime.strptime(r.text.split('\n')[0], '%Y%m%d%H%M%S')
+        finally:
+            r.close()
+
+    def is_build_dir(self, folder_name):
+        """Return whether or not the given dir contains a build."""
+
+        # Cannot move up to base scraper due to parser.entries call in
+        # get_build_info_for_date (see below)
+
+        url = '%s/' % urljoin(self.base_url, self.monthly_build_list_regex, folder_name)
+        if self.application in APPLICATIONS_MULTI_LOCALE \
+                and self.locale != 'multi':
+            url = '%s/' % urljoin(url, self.locale)
+
+        parser = self._create_directory_parser(url)
+
+        pattern = re.compile(self.binary_regex, re.IGNORECASE)
+        for entry in parser.entries:
+            try:
+                pattern.match(entry).group()
+                return True
+            except:
+                # No match, continue with next entry
+                continue
+        return False
+
+    def get_build_info_for_date(self, date, build_index=None):
+        url = urljoin(self.base_url, self.monthly_build_list_regex)
+        has_time = date and date.time()
+
+        self.logger.info('Retrieving list of builds from %s' % url)
+        parser = self._create_directory_parser(url)
+        regex = r'%(DATE)s-(\d+-)+%(BRANCH)s%(L10N)s%(PLATFORM)s$' % {
+            'DATE': date.strftime('%Y-%m-%d'),
+            'BRANCH': self.branch,
+            # ensure to select the correct subfolder for localized builds
+            'L10N': '' if self.locale in ('en-US', 'multi') else '(-l10n)?',
+            'PLATFORM': '' if self.application not in (
+                        'fennec') else '-' + self.platform
+        }
+
         parser.entries = parser.filter(regex)
-        if not parser.entries:
-            message = 'Folder for builds on %s has not been found' % self.date.strftime('%Y-%m-%d')
-            raise NotFoundException(message, url)
+        parser.entries = parser.filter(self.is_build_dir)
 
         if has_time:
-            # If a time is included in the date, use it to determine the build's index
+            # If a time is included in the date, use it to determine the
+            # build's index
             regex = r'.*%s.*' % date.strftime('%H-%M-%S')
-            build_index = parser.entries.index(parser.filter(regex)[0])
-        else:
-            # If no index has been given, set it to the last build of the day.
-            if build_index is None:
-                build_index = len(parser.entries) - 1
+            parser.entries = parser.filter(regex)
+
+        if not parser.entries:
+            date_format = '%Y-%m-%d-%H-%M-%S' if has_time else '%Y-%m-%d'
+            message = 'Folder for builds on %s has not been found' % \
+                self.date.strftime(date_format)
+            raise errors.NotFoundError(message, url)
+
+        # If no index has been given, set it to the last build of the day.
+        self.show_matching_builds(parser.entries)
+        # If no index has been given, set it to the last build of the day.
+        if build_index is None:
+            # Find the most recent non-empty entry.
+            build_index = len(parser.entries)
+            for build in reversed(parser.entries):
+                build_index -= 1
+                if not build_index or self.is_build_dir(build):
+                    break
+        self.logger.info('Selected build: %s' % parser.entries[build_index])
 
         return (parser.entries, build_index)
 
-
     @property
     def binary_regex(self):
         """Return the regex for the binary"""
 
         regex_base_name = r'^%(APP)s-.*\.%(LOCALE)s\.%(PLATFORM)s'
-        regex_suffix = {'linux': r'\.%(EXT)s$',
+        regex_suffix = {'android-api-9': r'\.%(EXT)s$',
+                        'android-api-11': r'\.%(EXT)s$',
+                        'android-x86': r'\.%(EXT)s$',
+                        'linux': r'\.%(EXT)s$',
                         'linux64': r'\.%(EXT)s$',
                         'mac': r'\.%(EXT)s$',
                         'mac64': r'\.%(EXT)s$',
-                        'win32': r'(\.installer)\.%(EXT)s$',
-                        'win64': r'(\.installer)\.%(EXT)s$'}
+                        'win32': r'(\.installer%(STUB)s)?\.%(EXT)s$',
+                        'win64': r'(\.installer%(STUB)s)?\.%(EXT)s$'}
         regex = regex_base_name + regex_suffix[self.platform]
 
         return regex % {'APP': self.application,
                         'LOCALE': self.locale,
                         'PLATFORM': self.platform_regex,
-                        'EXT': self.extension}
-
+                        'EXT': self.extension,
+                        'STUB': '-stub' if self.is_stub_installer else ''}
 
     def build_filename(self, binary):
         """Return the proposed filename with extension for the binary"""
 
         try:
             # Get exact timestamp of the build to build the local file name
             folder = self.builds[self.build_index]
             timestamp = re.search('([\d\-]+)-\D.*', folder).group(1)
         except:
             # If it's not available use the build's date
             timestamp = self.date.strftime('%Y-%m-%d')
 
         return '%(TIMESTAMP)s-%(BRANCH)s-%(NAME)s' % {
-                   'TIMESTAMP': timestamp,
-                   'BRANCH': self.branch,
-                   'NAME': binary}
-
+            'TIMESTAMP': timestamp,
+            'BRANCH': self.branch,
+            'NAME': binary}
 
     @property
     def monthly_build_list_regex(self):
-        """Return the regex for the folder which contains the builds of a month."""
+        """Return the regex for the folder containing builds of a month."""
 
         # Regex for possible builds for the given date
         return r'nightly/%(YEAR)s/%(MONTH)s/' % {
-                  'YEAR': self.date.year,
-                  'MONTH': str(self.date.month).zfill(2) }
-
+            'YEAR': self.date.year,
+            'MONTH': str(self.date.month).zfill(2)}
 
     @property
     def path_regex(self):
-        """Return the regex for the path"""
+        """Return the regex for the path to the build folder"""
 
         try:
-            return self.monthly_build_list_regex + self.builds[self.build_index]
+            path = '%s/' % urljoin(self.monthly_build_list_regex,
+                                   self.builds[self.build_index])
+            if self.application in APPLICATIONS_MULTI_LOCALE \
+                    and self.locale != 'multi':
+                path = '%s/' % urljoin(path, self.locale)
+            return path
         except:
-            raise NotFoundException("Specified sub folder cannot be found",
-                                    self.base_url + self.monthly_build_list_regex)
+            folder = urljoin(self.base_url, self.monthly_build_list_regex)
+            raise errors.NotFoundError("Specified sub folder cannot be found",
+                                       folder)
 
 
 class DirectScraper(Scraper):
     """Class to download a file from a specified URL"""
 
     def __init__(self, url, *args, **kwargs):
+        self._url = url
+
         Scraper.__init__(self, *args, **kwargs)
 
-        self.url = url
+    @property
+    def filename(self):
+        if os.path.splitext(self.destination)[1]:
+            # If the filename has been given make use of it
+            target_file = self.destination
+        else:
+            # Otherwise determine it from the url.
+            parsed_url = urlparse(self.url)
+            source_filename = (parsed_url.path.rpartition('/')[-1] or
+                               parsed_url.hostname)
+            target_file = os.path.join(self.destination, source_filename)
+
+        return os.path.abspath(target_file)
 
     @property
-    def target(self):
-        return urllib.splitquery(self.final_url)[0].rpartition('/')[-1]
-
-    @property
-    def final_url(self):
-        return self.url
+    def url(self):
+        return self._url
 
 
 class ReleaseScraper(Scraper):
     """Class to download a release build from the Mozilla server"""
 
-    def __init__(self, *args, **kwargs):
+    def __init__(self, version, *args, **kwargs):
+        self.version = version
+
         Scraper.__init__(self, *args, **kwargs)
 
     @property
     def binary_regex(self):
         """Return the regex for the binary"""
 
         regex = {'linux': r'^%(APP)s-.*\.%(EXT)s$',
                  'linux64': r'^%(APP)s-.*\.%(EXT)s$',
                  'mac': r'^%(APP)s.*\.%(EXT)s$',
                  'mac64': r'^%(APP)s.*\.%(EXT)s$',
-                 'win32': r'^%(APP)s.*\.%(EXT)s$',
-                 'win64': r'^%(APP)s.*\.%(EXT)s$'}
-        return regex[self.platform] % {'APP': self.application,
-                                       'EXT': self.extension}
-
+                 'win32': r'^%(APP)s.*%(STUB)s.*\.%(EXT)s$',
+                 'win64': r'^%(APP)s.*%(STUB)s.*\.%(EXT)s$'}
+        return regex[self.platform] % {
+            'APP': self.application,
+            'EXT': self.extension,
+            'STUB': 'Stub' if self.is_stub_installer else ''}
 
     @property
     def path_regex(self):
-        """Return the regex for the path"""
+        """Return the regex for the path to the build folder"""
 
-        regex = r'releases/%(VERSION)s/%(PLATFORM)s/%(LOCALE)s'
+        regex = r'releases/%(VERSION)s/%(PLATFORM)s/%(LOCALE)s/'
         return regex % {'LOCALE': self.locale,
                         'PLATFORM': self.platform_regex,
                         'VERSION': self.version}
 
+    @property
+    def platform_regex(self):
+        """Return the platform fragment of the URL"""
+
+        if self.platform == 'win64':
+            return self.platform
+
+        return PLATFORM_FRAGMENTS[self.platform]
 
     def build_filename(self, binary):
         """Return the proposed filename with extension for the binary"""
 
-        template = '%(APP)s-%(VERSION)s.%(LOCALE)s.%(PLATFORM)s.%(EXT)s'
+        template = '%(APP)s-%(VERSION)s.%(LOCALE)s.%(PLATFORM)s%(STUB)s' \
+                   '.%(EXT)s'
         return template % {'APP': self.application,
                            'VERSION': self.version,
                            'LOCALE': self.locale,
                            'PLATFORM': self.platform,
+                           'STUB': '-stub' if self.is_stub_installer else '',
                            'EXT': self.extension}
 
 
 class ReleaseCandidateScraper(ReleaseScraper):
     """Class to download a release candidate build from the Mozilla server"""
 
-    def __init__(self, build_number=None, no_unsigned=False, *args, **kwargs):
+    def __init__(self, version, build_number=None, *args, **kwargs):
+        self.version = version
+        self.build_number = build_number
+
         Scraper.__init__(self, *args, **kwargs)
 
+    def get_build_info(self):
+        """Defines additional build information"""
+
         # Internally we access builds via index
-        if build_number is not None:
-            self.build_index = int(build_number) - 1
+        url = urljoin(self.base_url, self.candidate_build_list_regex)
+        self.logger.info('Retrieving list of candidate builds from %s' % url)
+
+        parser = self._create_directory_parser(url)
+        if not parser.entries:
+            message = 'Folder for specific candidate builds at %s has not' \
+                'been found' % url
+            raise errors.NotFoundError(message, url)
+
+        self.show_matching_builds(parser.entries)
+        self.builds = parser.entries
+        self.build_index = len(parser.entries) - 1
+
+        if self.build_number and \
+                ('build%s' % self.build_number) in self.builds:
+            self.builds = ['build%s' % self.build_number]
+            self.build_index = 0
+            self.logger.info('Selected build: build%s' % self.build_number)
         else:
-            self.build_index = None
-
-        self.builds, self.build_index = self.get_build_info_for_version(self.version, self.build_index)
-
-        self.no_unsigned = no_unsigned
-        self.unsigned = False
-
-
-    def get_build_info_for_version(self, version, build_index=None):
-        url = '/'.join([self.base_url, self.candidate_build_list_regex])
-
-        print 'Retrieving list of candidate builds from %s' % url
-        parser = DirectoryParser(url)
-        if not parser.entries:
-            message = 'Folder for specific candidate builds at has not been found'
-            raise NotFoundException(message, url)
-
-        # If no index has been given, set it to the last build of the given version.
-        if build_index is None:
-            build_index = len(parser.entries) - 1
-
-        return (parser.entries, build_index)
-
+            self.logger.info('Selected build: build%d' %
+                             (self.build_index + 1))
 
     @property
     def candidate_build_list_regex(self):
         """Return the regex for the folder which contains the builds of
            a candidate build."""
 
         # Regex for possible builds for the given date
-        return r'nightly/%(VERSION)s-candidates/' % {
-                 'VERSION': self.version }
-
+        return r'candidates/%(VERSION)s-candidates/' % {
+            'VERSION': self.version}
 
     @property
     def path_regex(self):
-        """Return the regex for the path"""
+        """Return the regex for the path to the build folder"""
 
-        regex = r'%(PREFIX)s%(BUILD)s/%(UNSIGNED)s%(PLATFORM)s/%(LOCALE)s'
+        regex = r'%(PREFIX)s%(BUILD)s/%(PLATFORM)s/%(LOCALE)s/'
         return regex % {'PREFIX': self.candidate_build_list_regex,
                         'BUILD': self.builds[self.build_index],
                         'LOCALE': self.locale,
-                        'PLATFORM': self.platform_regex,
-                        'UNSIGNED': "unsigned/" if self.unsigned else ""}
+                        'PLATFORM': self.platform_regex}
 
+    @property
+    def platform_regex(self):
+        """Return the platform fragment of the URL"""
+
+        if self.platform == 'win64':
+            return self.platform
+
+        return PLATFORM_FRAGMENTS[self.platform]
 
     def build_filename(self, binary):
         """Return the proposed filename with extension for the binary"""
 
-        template = '%(APP)s-%(VERSION)s-build%(BUILD)s.%(LOCALE)s.%(PLATFORM)s.%(EXT)s'
+        template = '%(APP)s-%(VERSION)s-%(BUILD)s.%(LOCALE)s.' \
+                   '%(PLATFORM)s%(STUB)s.%(EXT)s'
         return template % {'APP': self.application,
                            'VERSION': self.version,
                            'BUILD': self.builds[self.build_index],
                            'LOCALE': self.locale,
                            'PLATFORM': self.platform,
+                           'STUB': '-stub' if self.is_stub_installer else '',
                            'EXT': self.extension}
 
-
     def download(self):
         """Download the specified file"""
 
         try:
             # Try to download the signed candidate build
             Scraper.download(self)
-        except NotFoundException, e:
-            print str(e)
-
-            # If the signed build cannot be downloaded and unsigned builds are
-            # allowed, try to download the unsigned build instead
-            if self.no_unsigned:
-                raise
-            else:
-                print "Signed build has not been found. Falling back to unsigned build."
-                self.unsigned = True
-                Scraper.download(self)
+        except errors.NotFoundError, e:
+            self.logger.exception(str(e))
 
 
 class TinderboxScraper(Scraper):
     """Class to download a tinderbox build from the Mozilla server.
 
     There are two ways to specify a unique build:
     1. If the date (%Y-%m-%d) is given and build_number is given where
        the build_number is the index of the build on the date
     2. If the build timestamp (UNIX) is given, and matches a specific build.
     """
 
     def __init__(self, branch='mozilla-central', build_number=None, date=None,
                  debug_build=False, *args, **kwargs):
+
+        self.branch = branch
+        self.build_number = build_number
+        self.debug_build = debug_build
+        self.date = date
+
+        self.timestamp = None
+        # Currently any time in RelEng is based on the Pacific time zone.
+        self.timezone = PacificTimezone()
+
         Scraper.__init__(self, *args, **kwargs)
 
-        self.branch = branch
-        self.debug_build = debug_build
-        self.locale_build = self.locale != 'en-US'
-        self.timestamp = None
-
-        # Currently any time in RelEng is based on the Pacific time zone.
-        self.timezone = PacificTimezone();
+    def get_build_info(self):
+        "Defines additional build information"
 
         # Internally we access builds via index
-        if build_number is not None:
-            self.build_index = int(build_number) - 1
+        if self.build_number is not None:
+            self.build_index = int(self.build_number) - 1
         else:
             self.build_index = None
 
-        if date is not None:
+        if self.date is not None:
             try:
-                self.date = datetime.fromtimestamp(float(date), self.timezone)
-                self.timestamp = date
+                # date is provided in the format 2013-07-23
+                self.date = datetime.strptime(self.date, '%Y-%m-%d')
             except:
-                self.date = datetime.strptime(date, '%Y-%m-%d')
-        else:
-            self.date = None
+                try:
+                    # date is provided as a unix timestamp
+                    datetime.fromtimestamp(float(self.date))
+                    self.timestamp = self.date
+                except:
+                    raise ValueError('%s is not a valid date' % self.date)
 
+        self.locale_build = self.locale != 'en-US'
         # For localized builds we do not have to retrieve the list of builds
         # because only the last build is available
         if not self.locale_build:
-            self.builds, self.build_index = self.get_build_info(self.build_index)
-    
-            try:
-                self.timestamp = self.builds[self.build_index]
-            except:
-                raise NotFoundException("Specified sub folder cannot be found",
-                                        self.base_url + self.monthly_build_list_regex)
-
+            self.builds, self.build_index = self.get_build_info_for_index(
+                self.build_index)
 
     @property
     def binary_regex(self):
         """Return the regex for the binary"""
 
-        regex_base_name = r'^%(APP)s-.*\.%(LOCALE)s\.'
+        regex_base_name = r'^%(APP)s-.*\.%(LOCALE)s\.%(PLATFORM)s'
         regex_suffix = {'linux': r'.*\.%(EXT)s$',
                         'linux64': r'.*\.%(EXT)s$',
                         'mac': r'.*\.%(EXT)s$',
                         'mac64': r'.*\.%(EXT)s$',
-                        'win32': r'.*(\.installer)\.%(EXT)s$',
-                        'win64': r'.*(\.installer)\.%(EXT)s$'}
+                        'win32': r'(\.installer%(STUB)s)?\.%(EXT)s$',
+                        'win64': r'(\.installer%(STUB)s)?\.%(EXT)s$'}
 
         regex = regex_base_name + regex_suffix[self.platform]
 
         return regex % {'APP': self.application,
                         'LOCALE': self.locale,
+                        'PLATFORM': PLATFORM_FRAGMENTS[self.platform],
+                        'STUB': '-stub' if self.is_stub_installer else '',
                         'EXT': self.extension}
 
-
     def build_filename(self, binary):
         """Return the proposed filename with extension for the binary"""
 
         return '%(TIMESTAMP)s%(BRANCH)s%(DEBUG)s-%(NAME)s' % {
-                   'TIMESTAMP': self.timestamp + '-' if self.timestamp else '',
-                   'BRANCH': self.branch,
-                   'DEBUG': '-debug' if self.debug_build else '',
-                   'NAME': binary}
-
+            'TIMESTAMP': self.timestamp + '-' if self.timestamp else '',
+            'BRANCH': self.branch,
+            'DEBUG': '-debug' if self.debug_build else '',
+            'NAME': binary}
 
     @property
     def build_list_regex(self):
         """Return the regex for the folder which contains the list of builds"""
 
-        regex = 'tinderbox-builds/%(BRANCH)s-%(PLATFORM)s%(L10N)s%(DEBUG)s'
+        regex = 'tinderbox-builds/%(BRANCH)s-%(PLATFORM)s%(L10N)s%(DEBUG)s/'
 
-        return regex % {'BRANCH': self.branch,
-                        'PLATFORM': '' if self.locale_build else self.platform_regex,
-                        'L10N': 'l10n' if self.locale_build else '',
-                        'DEBUG': '-debug' if self.debug_build else ''}
-
+        return regex % {
+            'BRANCH': self.branch,
+            'PLATFORM': '' if self.locale_build else self.platform_regex,
+            'L10N': 'l10n' if self.locale_build else '',
+            'DEBUG': '-debug' if self.debug_build else ''}
 
     def date_matches(self, timestamp):
-        """Determines whether the timestamp date is equal to the argument date"""
+        """
+        Determines whether the timestamp date is equal to the argument date
+        """
 
         if self.date is None:
             return False
 
         timestamp = datetime.fromtimestamp(float(timestamp), self.timezone)
         if self.date.date() == timestamp.date():
             return True
-        
+
         return False
 
-
-    @property
-    def date_validation_regex(self):
-        """Return the regex for a valid date argument value"""
-
-        return r'^\d{4}-\d{1,2}-\d{1,2}$|^\d+$'
-
-
     def detect_platform(self):
         """Detect the current platform"""
 
         platform = Scraper.detect_platform(self)
 
-        # On OS X we have to special case the platform detection code and fallback
-        # to 64 bit builds for the en-US locale
-        if mozinfo.os == 'mac' and self.locale == 'en-US' and mozinfo.bits == 64:
+        # On OS X we have to special case the platform detection code and
+        # fallback to 64 bit builds for the en-US locale
+        if mozinfo.os == 'mac' and self.locale == 'en-US' and \
+                mozinfo.bits == 64:
             platform = "%s%d" % (mozinfo.os, mozinfo.bits)
 
         return platform
 
+    def is_build_dir(self, folder_name):
+        """Return whether or not the given dir contains a build."""
 
-    def get_build_info(self, build_index=None):
-        url = '/'.join([self.base_url, self.build_list_regex])
+        # Cannot move up to base scraper due to parser.entries call in
+        # get_build_info_for_index (see below)
+        url = '%s/' % urljoin(self.base_url, self.build_list_regex, folder_name)
 
-        print 'Retrieving list of builds from %s' % url
+        if self.application in APPLICATIONS_MULTI_LOCALE \
+                and self.locale != 'multi':
+            url = '%s/' % urljoin(url, self.locale)
 
-        # If a timestamp is given, retrieve just that build
-        regex = '^' + self.timestamp + '$' if self.timestamp else r'^\d+$'
+        parser = self._create_directory_parser(url)
 
-        parser = DirectoryParser(url)
-        parser.entries = parser.filter(regex)
+        pattern = re.compile(self.binary_regex, re.IGNORECASE)
+        for entry in parser.entries:
+            try:
+                pattern.match(entry).group()
+                return True
+            except:
+                # No match, continue with next entry
+                continue
+        return False
 
-        # If date is given, retrieve the subset of builds on that date
-        if self.date is not None:
+    def get_build_info_for_index(self, build_index=None):
+        url = urljoin(self.base_url, self.build_list_regex)
+
+        self.logger.info('Retrieving list of builds from %s' % url)
+        parser = self._create_directory_parser(url)
+        parser.entries = parser.filter(r'^\d+$')
+
+        if self.timestamp:
+            # If a timestamp is given, retrieve the folder with the timestamp
+            # as name
+            parser.entries = self.timestamp in parser.entries and \
+                [self.timestamp]
+
+        elif self.date:
+            # If date is given, retrieve the subset of builds on that date
             parser.entries = filter(self.date_matches, parser.entries)
 
         if not parser.entries:
             message = 'No builds have been found'
-            raise NotFoundException(message, url)
+            raise errors.NotFoundError(message, url)
+
+        self.show_matching_builds(parser.entries)
 
         # If no index has been given, set it to the last build of the day.
         if build_index is None:
-            build_index = len(parser.entries) - 1
+            # Find the most recent non-empty entry.
+            build_index = len(parser.entries)
+            for build in reversed(parser.entries):
+                build_index -= 1
+                if not build_index or self.is_build_dir(build):
+                    break
+
+        self.logger.info('Selected build: %s' % parser.entries[build_index])
 
         return (parser.entries, build_index)
 
-
     @property
     def path_regex(self):
-        """Return the regex for the path"""
+        """Return the regex for the path to the build folder"""
 
         if self.locale_build:
             return self.build_list_regex
 
-        return '/'.join([self.build_list_regex, self.builds[self.build_index]])
-
+        return '%s/' % urljoin(self.build_list_regex, self.builds[self.build_index])
 
     @property
     def platform_regex(self):
         """Return the platform fragment of the URL"""
 
         PLATFORM_FRAGMENTS = {'linux': 'linux',
                               'linux64': 'linux64',
-                              'mac': 'macosx',
+                              'mac': 'macosx64',
                               'mac64': 'macosx64',
                               'win32': 'win32',
                               'win64': 'win64'}
 
         return PLATFORM_FRAGMENTS[self.platform]
 
 
-def cli():
-    """Main function for the downloader"""
+class TryScraper(Scraper):
+    "Class to download a try build from the Mozilla server."
 
-    BUILD_TYPES = {'release': ReleaseScraper,
-                   'candidate': ReleaseCandidateScraper,
-                   'daily': DailyScraper,
-                   'tinderbox': TinderboxScraper }
+    def __init__(self, changeset=None, debug_build=False, *args, **kwargs):
 
-    usage = 'usage: %prog [options]'
-    parser = OptionParser(usage=usage, description=__doc__)
-    parser.add_option('--application', '-a',
-                      dest='application',
-                      choices=APPLICATIONS,
-                      default='firefox',
-                      metavar='APPLICATION',
-                      help='The name of the application to download, '
-                           'default: "%default"')
-    parser.add_option('--directory', '-d',
-                      dest='directory',
-                      default=os.getcwd(),
-                      metavar='DIRECTORY',
-                      help='Target directory for the download, default: '
-                           'current working directory')
-    parser.add_option('--build-number',
-                      dest='build_number',
-                      default=None,
-                      type="int",
-                      metavar='BUILD_NUMBER',
-                      help='Number of the build (for candidate, daily, '
-                           'and tinderbox builds)')
-    parser.add_option('--locale', '-l',
-                      dest='locale',
-                      default='en-US',
-                      metavar='LOCALE',
-                      help='Locale of the application, default: "%default"')
-    parser.add_option('--platform', '-p',
-                      dest='platform',
-                      choices=PLATFORM_FRAGMENTS.keys(),
-                      metavar='PLATFORM',
-                      help='Platform of the application')
-    parser.add_option('--type', '-t',
-                      dest='type',
-                      choices=BUILD_TYPES.keys(),
-                      default='release',
-                      metavar='BUILD_TYPE',
-                      help='Type of build to download, default: "%default"')
-    parser.add_option('--url',
-                      dest='url',
-                      default=None,
-                      metavar='URL',
-                      help='URL to download.')
-    parser.add_option('--version', '-v',
-                      dest='version',
-                      metavar='VERSION',
-                      help='Version of the application to be used by release and\
-                            candidate builds, i.e. "3.6"')
-    parser.add_option('--extension',
-                      dest='extension',
-                      default=None,
-                      metavar='EXTENSION',
-                      help='File extension of the build (e.g. "zip"), default:\
-                            the standard build extension on the platform.')
-    parser.add_option('--username',
-                      dest='username',
-                      default=None,
-                      metavar='USERNAME',
-                      help='Username for basic HTTP authentication.')
-    parser.add_option('--password',
-                      dest='password',
-                      default=None,
-                      metavar='PASSWORD',
-                      help='Password for basic HTTP authentication.')
-    parser.add_option('--retry-attempts',
-                      dest='retry_attempts',
-                      default=3,
-                      type=int,
-                      metavar='RETRY_ATTEMPTS',
-                      help='Number of times the download will be attempted in '
-                           'the event of a failure, default: %default')
-    parser.add_option('--retry-delay',
-                      dest='retry_delay',
-                      default=10,
-                      type=int,
-                      metavar='RETRY_DELAY',
-                      help='Amount of time (in seconds) to wait between retry '
-                           'attempts, default: %default')
+        self.debug_build = debug_build
+        self.changeset = changeset
 
-    # Option group for candidate builds
-    group = OptionGroup(parser, "Candidate builds",
-                        "Extra options for candidate builds.")
-    group.add_option('--no-unsigned',
-                     dest='no_unsigned',
-                     action="store_true",
-                     help="Don't allow to download unsigned builds if signed\
-                           builds are not available")
-    parser.add_option_group(group)
+        Scraper.__init__(self, *args, **kwargs)
 
-    # Option group for daily builds
-    group = OptionGroup(parser, "Daily builds",
-                        "Extra options for daily builds.")
-    group.add_option('--branch',
-                     dest='branch',
-                     default='mozilla-central',
-                     metavar='BRANCH',
-                     help='Name of the branch, default: "%default"')
-    group.add_option('--build-id',
-                      dest='build_id',
-                      default=None,
-                      metavar='BUILD_ID',
-                      help='ID of the build to download')
-    group.add_option('--date',
-                     dest='date',
-                     default=None,
-                     metavar='DATE',
-                     help='Date of the build, default: latest build')
-    parser.add_option_group(group)
+    def get_build_info(self):
+        "Defines additional build information"
 
-    # Option group for tinderbox builds
-    group = OptionGroup(parser, "Tinderbox builds",
-                        "Extra options for tinderbox builds.")
-    group.add_option('--debug-build',
-                     dest='debug_build',
-                     action="store_true",
-                     help="Download a debug build")
-    parser.add_option_group(group)
+        self.builds, self.build_index = self.get_build_info_for_index()
 
-    # TODO: option group for nightly builds
-    (options, args) = parser.parse_args()
+    @property
+    def binary_regex(self):
+        """Return the regex for the binary"""
 
-    # Check for required options and arguments
-    # Note: Will be optional when ini file support has been landed
-    if not options.url \
-       and not options.type in ['daily', 'tinderbox'] \
-       and not options.version:
-        parser.error('The version of the application to download has not been specified.')
+        regex_base_name = r'^%(APP)s-.*\.%(LOCALE)s\.%(PLATFORM)s'
+        regex_suffix = {'linux': r'.*\.%(EXT)s$',
+                        'linux64': r'.*\.%(EXT)s$',
+                        'mac': r'.*\.%(EXT)s$',
+                        'mac64': r'.*\.%(EXT)s$',
+                        'win32': r'.*(\.installer%(STUB)s)\.%(EXT)s$',
+                        'win64': r'.*(\.installer%(STUB)s)\.%(EXT)s$'}
 
-    # Instantiate scraper and download the build
-    scraper_keywords = {'application': options.application,
-                        'locale': options.locale,
-                        'platform': options.platform,
-                        'version': options.version,
-                        'directory': options.directory,
-                        'extension': options.extension,
-                        'authentication': {
-                            'username': options.username,
-                            'password': options.password},
-                        'retry_attempts': options.retry_attempts,
-                        'retry_delay': options.retry_delay}
-    scraper_options = {'candidate': {
-                           'build_number': options.build_number,
-                           'no_unsigned': options.no_unsigned},
-                       'daily': {
-                           'branch': options.branch,
-                           'build_number': options.build_number,
-                           'build_id': options.build_id,
-                           'date': options.date},
-                       'tinderbox': {
-                           'branch': options.branch,
-                           'build_number': options.build_number,
-                           'date': options.date,
-                           'debug_build': options.debug_build}
-                       }
+        regex = regex_base_name + regex_suffix[self.platform]
 
-    kwargs = scraper_keywords.copy()
-    kwargs.update(scraper_options.get(options.type, {}))
+        return regex % {'APP': self.application,
+                        'LOCALE': self.locale,
+                        'PLATFORM': PLATFORM_FRAGMENTS[self.platform],
+                        'STUB': '-stub' if self.is_stub_installer else '',
+                        'EXT': self.extension}
 
-    if options.url:
-        build = DirectScraper(options.url, **kwargs)
-    else:
-        build = BUILD_TYPES[options.type](**kwargs)
+    def build_filename(self, binary):
+        """Return the proposed filename with extension for the binary"""
 
-    build.download()
+        return '%(CHANGESET)s%(DEBUG)s-%(NAME)s' % {
+            'CHANGESET': self.changeset,
+            'DEBUG': '-debug' if self.debug_build else '',
+            'NAME': binary}
 
-if __name__ == "__main__":
-    cli()
+    @property
+    def build_list_regex(self):
+        """Return the regex for the folder which contains the list of builds"""
+
+        return 'try-builds/'
+
+    def detect_platform(self):
+        """Detect the current platform"""
+
+        platform = Scraper.detect_platform(self)
+
+        # On OS X we have to special case the platform detection code and
+        # fallback to 64 bit builds for the en-US locale
+        if mozinfo.os == 'mac' and self.locale == 'en-US' and \
+                mozinfo.bits == 64:
+            platform = "%s%d" % (mozinfo.os, mozinfo.bits)
+
+        return platform
+
+    def get_build_info_for_index(self, build_index=None):
+        url = urljoin(self.base_url, self.build_list_regex)
+
+        self.logger.info('Retrieving list of builds from %s' % url)
+        parser = self._create_directory_parser(url)
+        parser.entries = parser.filter('.*-%s$' % self.changeset)
+
+        if not parser.entries:
+            raise errors.NotFoundError('No builds have been found', url)
+
+        self.show_matching_builds(parser.entries)
+
+        self.logger.info('Selected build: %s' % parser.entries[0])
+
+        return (parser.entries, 0)
+
+    @property
+    def path_regex(self):
+        """Return the regex for the path to the build folder"""
+
+        build_dir = 'try-%(PLATFORM)s%(DEBUG)s/' % {
+            'PLATFORM': self.platform_regex,
+            'DEBUG': '-debug' if self.debug_build else ''}
+        return urljoin(self.build_list_regex,
+                       self.builds[self.build_index],
+                       build_dir)
+
+    @property
+    def platform_regex(self):
+        """Return the platform fragment of the URL"""
+
+        PLATFORM_FRAGMENTS = {'linux': 'linux',
+                              'linux64': 'linux64',
+                              'mac': 'macosx64',
+                              'mac64': 'macosx64',
+                              'win32': 'win32',
+                              'win64': 'win64'}
+
+        return PLATFORM_FRAGMENTS[self.platform]