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versionChecker.py

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  • versionChecker.py 31.24 KiB
    # Author: Nic Wolfe <nic@wolfeden.ca>
    # URL: http://code.google.com/p/sickbeard/
    #
    # This file is part of SickRage.
    #
    # SickRage is free software: you can redistribute it and/or modify
    # it under the terms of the GNU General Public License as published by
    # the Free Software Foundation, either version 3 of the License, or
    # (at your option) any later version.
    #
    # SickRage is distributed in the hope that it will be useful,
    # but WITHOUT ANY WARRANTY; without even the implied warranty of
    # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    # GNU General Public License for more details.
    #
    # You should have received a copy of the GNU General Public License
    # along with SickRage.  If not, see <http://www.gnu.org/licenses/>.
    
    import os
    import platform
    import subprocess
    import re
    import urllib
    import tarfile
    import stat
    import traceback
    import db
    import time
    
    import sickbeard
    from sickbeard import notifiers
    from sickbeard import ui
    from sickbeard import logger, helpers
    from sickbeard.exceptions import ex
    from sickbeard import encodingKludge as ek
    import requests
    from requests.exceptions import RequestException
    
    import shutil
    import lib.shutil_custom
    
    shutil.copyfile = lib.shutil_custom.copyfile_custom
    
    
    class CheckVersion():
        """
        Version check class meant to run as a thread object with the sr scheduler.
        """
    
        def __init__(self):
            self.updater = None
            self.install_type = None        
            self.amActive = False
            if sickbeard.gh:
                self.install_type = self.find_install_type()
                if self.install_type == 'git':
                    self.updater = GitUpdateManager()
                elif self.install_type == 'source':
                    self.updater = SourceUpdateManager()
    
        def run(self, force=False):
    
            if self.updater:
                # set current branch version
                sickbeard.BRANCH = self.get_branch()
    
                if self.check_for_new_version(force):
                    if sickbeard.AUTO_UPDATE:
                        logger.log(u"New update found for SickRage, starting auto-updater ...")
                        ui.notifications.message('New update found for SickRage, starting auto-updater')
                        if self.run_backup_if_safe() is True:
                            if sickbeard.versionCheckScheduler.action.update():
                                logger.log(u"Update was successful!")
                                ui.notifications.message('Update was successful')
                                sickbeard.events.put(sickbeard.events.SystemEvent.RESTART)
                            else:
                                logger.log(u"Update failed!")
                                ui.notifications.message('Update failed!')
    
        def run_backup_if_safe(self):
            return self.safe_to_update() is True and self._runbackup() is True
    
        def _runbackup(self):
            # Do a system backup before update
            logger.log(u"Config backup in progress...")
            ui.notifications.message('Backup', 'Config backup in progress...')
            try:
                backupDir = os.path.join(sickbeard.DATA_DIR, 'backup')
                if not os.path.isdir(backupDir):
                    os.mkdir(backupDir)
        
                if self._keeplatestbackup(backupDir) == True and self._backup(backupDir) == True:
                    logger.log(u"Config backup successful, updating...")
                    ui.notifications.message('Backup', 'Config backup successful, updating...')
                    return True
                else:
                    logger.log(u"Config backup failed, aborting update",logger.ERROR)
                    ui.notifications.message('Backup', 'Config backup failed, aborting update')
                    return False
            except Exception as e:
                logger.log('Update: Config backup failed. Error: {0}'.format(ex(e)),logger.ERROR)
                ui.notifications.message('Backup', 'Config backup failed, aborting update')
                return False
    
        def _keeplatestbackup(self,backupDir=None):
            if backupDir:
                import glob
                files = glob.glob(os.path.join(backupDir,'*.zip'))
                if not files:
                    return True
                now = time.time()
                newest = files[0], now - os.path.getctime(files[0])
                for file in files[1:]:
                    age = now - os.path.getctime(file)
                    if age < newest[1]:
                        newest = file, age
                files.remove(newest[0])
                
                for file in files:
                    os.remove(file)
                return True
            else:
                return False
        
        # TODO: Merge with backup in helpers
        def _backup(self,backupDir=None):
            if backupDir:
                source = [os.path.join(sickbeard.DATA_DIR, 'sickbeard.db'), sickbeard.CONFIG_FILE]
                source.append(os.path.join(sickbeard.DATA_DIR, 'failed.db'))
                source.append(os.path.join(sickbeard.DATA_DIR, 'cache.db'))
                target = os.path.join(backupDir, 'sickrage-' + time.strftime('%Y%m%d%H%M%S') + '.zip')
    
                for (path, dirs, files) in os.walk(sickbeard.CACHE_DIR, topdown=True):
                    for dirname in dirs:
                        if path == sickbeard.CACHE_DIR and dirname not in ['images']:
                            dirs.remove(dirname)
                    for filename in files:
                        source.append(os.path.join(path, filename))
    
                if helpers.backupConfigZip(source, target, sickbeard.DATA_DIR):
                    return True
                else:
                    return False
            else:
                return False
    
        def safe_to_update(self):
    
            def db_safe(self):
                try:
                    result = self.getDBcompare(sickbeard.BRANCH)
                    if result == 'equal':
                        logger.log(u"We can proceed with the update. New update has same DB version", logger.DEBUG)
                        return True
                    elif result == 'upgrade':
                        logger.log(u"We can't proceed with the update. New update has a new DB version. Please manually update", logger.WARNING)
                        return False
                    elif result == 'downgrade':
                        logger.log(u"We can't proceed with the update. New update has a old DB version. It's not possible to downgrade", logger.ERROR)
                        return False
                    else:
                        logger.log(u"We can't proceed with the update. Unable to check remote DB version", logger.ERROR)
                        return False
                except:
                    logger.log(u"We can't proceed with the update. Unable to compare DB version", logger.ERROR)
                    return False
            
            def postprocessor_safe(self):
                if not sickbeard.autoPostProcesserScheduler.action.amActive:
                    logger.log(u"We can proceed with the update. Post-Processor is not running", logger.DEBUG)
                    return True
                else:
                    logger.log(u"We can't proceed with the update. Post-Processor is running", logger.DEBUG)
                    return False
            
            def showupdate_safe(self):
                if not sickbeard.showUpdateScheduler.action.amActive:
                    logger.log(u"We can proceed with the update. Shows are not being updated", logger.DEBUG)
                    return True
                else:
                    logger.log(u"We can't proceed with the update. Shows are being updated", logger.DEBUG)
                    return False
    
            db_safe = db_safe(self)
            postprocessor_safe = postprocessor_safe(self)
            showupdate_safe = showupdate_safe(self)
    
            if db_safe == True and postprocessor_safe == True and showupdate_safe == True:
                logger.log(u"Proceeding with auto update", logger.DEBUG)
                return True
            else:
                logger.log(u"Auto update aborted", logger.DEBUG)
                return False
    
        def getDBcompare(self, branchDest):
            try:
                response = requests.get("https://raw.githubusercontent.com/SICKRAGETV/SickRage/" + str(branchDest) +"/sickbeard/databases/mainDB.py")
                response.raise_for_status()
                match = re.search(r"MAX_DB_VERSION\s=\s(?P<version>\d{2,3})",response.text)
                branchDestDBversion = int(match.group('version'))
                myDB = db.DBConnection()
                branchCurrDBversion = myDB.checkDBVersion()
                if branchDestDBversion > branchCurrDBversion:
                    return 'upgrade'
                elif branchDestDBversion == branchCurrDBversion:
                    return 'equal'
                else:
                    return 'downgrade'
            except RequestException as e:
                return 'error'
            except Exception as e:
                return 'error'
    
        def find_install_type(self):
            """
            Determines how this copy of sr was installed.
    
            returns: type of installation. Possible values are:
                'win': any compiled windows build
                'git': running from source using git
                'source': running from source without git
            """
    
            # check if we're a windows build
            if sickbeard.BRANCH.startswith('build '):
                install_type = 'win'
            elif os.path.isdir(ek.ek(os.path.join, sickbeard.PROG_DIR, u'.git')):
                install_type = 'git'
            else:
                install_type = 'source'
    
            return install_type
    
        def check_for_new_version(self, force=False):
            """
            Checks the internet for a newer version.
    
            returns: bool, True for new version or False for no new version.
    
            force: if true the VERSION_NOTIFY setting will be ignored and a check will be forced
            """
    
            if not self.updater or not sickbeard.VERSION_NOTIFY and not sickbeard.AUTO_UPDATE and not force:
                logger.log(u"Version checking is disabled, not checking for the newest version")
                return False
    
            # checking for updates
            if not sickbeard.AUTO_UPDATE:
                logger.log(u"Checking for updates using " + self.install_type.upper())
    
            if not self.updater.need_update():
                sickbeard.NEWEST_VERSION_STRING = None
    
                if force:
                    ui.notifications.message('No update needed')
                    logger.log(u"No update needed")
    
                # no updates needed
                return False
    
            # found updates
            self.updater.set_newest_text()
            return True
    
        def update(self):
            if self.updater:
                # update branch with current config branch value
                self.updater.branch = sickbeard.BRANCH
    
                # check for updates
                if self.updater.need_update():
                    return self.updater.update()
    
        def list_remote_branches(self):
            if self.updater:
                return self.updater.list_remote_branches()
    
        def get_branch(self):
            if self.updater:
                return self.updater.branch
    
    
    class UpdateManager():
        def get_github_org(self):
            return sickbeard.GIT_ORG
    
        def get_github_repo(self):
            return sickbeard.GIT_REPO
    
        def get_update_url(self):
            return sickbeard.WEB_ROOT + "/home/update/?pid=" + str(sickbeard.PID)
    
    class GitUpdateManager(UpdateManager):
        def __init__(self):
            self._git_path = self._find_working_git()
            self.github_org = self.get_github_org()
            self.github_repo = self.get_github_repo()
    
            sickbeard.BRANCH = self.branch = self._find_installed_branch()
    
            self._cur_commit_hash = None
            self._newest_commit_hash = None
            self._num_commits_behind = 0
            self._num_commits_ahead = 0
    
        def get_cur_commit_hash(self):
            return self._cur_commit_hash
    
        def get_newest_commit_hash(self):
            return self._newest_commit_hash
    
        def get_cur_version(self):
            return self._run_git(self._git_path, "describe --abbrev=0 " + self._cur_commit_hash)[0]
    
        def get_newest_version(self):
            return self._run_git(self._git_path, "describe --abbrev=0 " + self._newest_commit_hash)[0]
    
        def get_num_commits_behind(self):
            return self._num_commits_behind
    
        def _git_error(self):
            error_message = 'Unable to find your git executable - Shutdown SickRage and EITHER set git_path in your config.ini OR delete your .git folder and run from source to enable updates.'
            sickbeard.NEWEST_VERSION_STRING = error_message
    
        def _find_working_git(self):
            test_cmd = 'version'
    
            if sickbeard.GIT_PATH:
                main_git = '"' + sickbeard.GIT_PATH + '"'
            else:
                main_git = 'git'
    
            logger.log(u"Checking if we can use git commands: " + main_git + ' ' + test_cmd, logger.DEBUG)
            output, err, exit_status = self._run_git(main_git, test_cmd)
    
            if exit_status == 0:
                logger.log(u"Using: " + main_git, logger.DEBUG)
                return main_git
            else:
                logger.log(u"Not using: " + main_git, logger.DEBUG)
    
            # trying alternatives
    
    
            alternative_git = []
    
            # osx people who start sr from launchd have a broken path, so try a hail-mary attempt for them
            if platform.system().lower() == 'darwin':
                alternative_git.append('/usr/local/git/bin/git')
    
            if platform.system().lower() == 'windows':
                if main_git != main_git.lower():
                    alternative_git.append(main_git.lower())
    
            if alternative_git:
                logger.log(u"Trying known alternative git locations", logger.DEBUG)
    
                for cur_git in alternative_git:
                    logger.log(u"Checking if we can use git commands: " + cur_git + ' ' + test_cmd, logger.DEBUG)
                    output, err, exit_status = self._run_git(cur_git, test_cmd)
    
                    if exit_status == 0:
                        logger.log(u"Using: " + cur_git, logger.DEBUG)
                        return cur_git
                    else:
                        logger.log(u"Not using: " + cur_git, logger.DEBUG)
    
            # Still haven't found a working git
            error_message = 'Unable to find your git executable - Shutdown SickRage and EITHER set git_path in your config.ini OR delete your .git folder and run from source to enable updates.'
            sickbeard.NEWEST_VERSION_STRING = error_message
    
            return None
    
        def _run_git(self, git_path, args):
    
            output = err = exit_status = None
    
            if not git_path:
                logger.log(u"No git specified, can't use git commands", logger.WARNING)
                exit_status = 1
                return (output, err, exit_status)
    
            cmd = git_path + ' ' + args
    
            try:
                logger.log(u"Executing " + cmd + " with your shell in " + sickbeard.PROG_DIR, logger.DEBUG)
                p = subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
                                     shell=True, cwd=sickbeard.PROG_DIR)
                output, err = p.communicate()
                exit_status = p.returncode
    
                if output:
                    output = output.strip()
    
    
            except OSError:
                logger.log(u"Command " + cmd + " didn't work")
                exit_status = 1
    
            if exit_status == 0:
                logger.log(cmd + u" : returned successful", logger.DEBUG)
                exit_status = 0
    
            elif exit_status == 1:
                if 'stash' in output:
                    logger.log(u"Please enable 'git reset' in settings or stash your changes in local files",logger.WARNING)
                else:
                    logger.log(cmd + u" returned : " + str(output), logger.ERROR)
                exit_status = 1
    
            elif exit_status == 128 or 'fatal:' in output or err:
                logger.log(cmd + u" returned : " + str(output), logger.WARNING)
                exit_status = 128
    
            else:
                logger.log(cmd + u" returned : " + str(output) + u", treat as error for now", logger.ERROR)
                exit_status = 1
    
            return (output, err, exit_status)
    
        def _find_installed_version(self):
            """
            Attempts to find the currently installed version of SickRage.
    
            Uses git show to get commit version.
    
            Returns: True for success or False for failure
            """
    
            output, err, exit_status = self._run_git(self._git_path, 'rev-parse HEAD')  # @UnusedVariable
    
            if exit_status == 0 and output:
                cur_commit_hash = output.strip()
                if not re.match('^[a-z0-9]+$', cur_commit_hash):
                    logger.log(u"Output doesn't look like a hash, not using it", logger.ERROR)
                    return False
                self._cur_commit_hash = cur_commit_hash
                sickbeard.CUR_COMMIT_HASH = str(cur_commit_hash)
                return True
            else:
                return False
    
        def _find_installed_branch(self):
            branch_info, err, exit_status = self._run_git(self._git_path, 'symbolic-ref -q HEAD')  # @UnusedVariable
            if exit_status == 0 and branch_info:
                branch = branch_info.strip().replace('refs/heads/', '', 1)
                if branch:
                    sickbeard.BRANCH = branch
                    return branch
                    
            return ""
            
        def _check_github_for_update(self):
            """
            Uses git commands to check if there is a newer version that the provided
            commit hash. If there is a newer version it sets _num_commits_behind.
            """
    
            self._num_commits_behind = 0
            self._num_commits_ahead = 0
    
            # update remote origin url
            self.update_remote_origin()
    
            # get all new info from github
            output, err, exit_status = self._run_git(self._git_path, 'fetch %s' % sickbeard.GIT_REMOTE)
    
            if not exit_status == 0:
                logger.log(u"Unable to contact github, can't check for update", logger.ERROR)
                return
    
            # get latest commit_hash from remote
            output, err, exit_status = self._run_git(self._git_path, 'rev-parse --verify --quiet "@{upstream}"')
    
            if exit_status == 0 and output:
                cur_commit_hash = output.strip()
    
                if not re.match('^[a-z0-9]+$', cur_commit_hash):
                    logger.log(u"Output doesn't look like a hash, not using it", logger.DEBUG)
                    return
    
                else:
                    self._newest_commit_hash = cur_commit_hash
            else:
                logger.log(u"git didn't return newest commit hash", logger.DEBUG)
                return
    
            # get number of commits behind and ahead (option --count not supported git < 1.7.2)
            output, err, exit_status = self._run_git(self._git_path, 'rev-list --left-right "@{upstream}"...HEAD')
    
            if exit_status == 0 and output:
    
                try:
                    self._num_commits_behind = int(output.count("<"))
                    self._num_commits_ahead = int(output.count(">"))
    
                except:
                    logger.log(u"git didn't return numbers for behind and ahead, not using it", logger.DEBUG)
                    return
    
            logger.log(u"cur_commit = " + str(self._cur_commit_hash) + u", newest_commit = " + str(self._newest_commit_hash)
                       + u", num_commits_behind = " + str(self._num_commits_behind) + u", num_commits_ahead = " + str(
                self._num_commits_ahead), logger.DEBUG)
    
        def set_newest_text(self):
    
            # if we're up to date then don't set this
            sickbeard.NEWEST_VERSION_STRING = None
    
            if self._num_commits_ahead:
                logger.log(u"Local branch is ahead of " + self.branch + ". Automatic update not possible.", logger.WARNING)
                newest_text = "Local branch is ahead of " + self.branch + ". Automatic update not possible."
    
            elif self._num_commits_behind > 0:
    
                base_url = 'http://github.com/' + self.github_org + '/' + self.github_repo
                if self._newest_commit_hash:
                    url = base_url + '/compare/' + self._cur_commit_hash + '...' + self._newest_commit_hash
                else:
                    url = base_url + '/commits/'
    
                newest_text = 'There is a <a href="' + url + '" onclick="window.open(this.href); return false;">newer version available</a> '
                newest_text += " (you're " + str(self._num_commits_behind) + " commit"
                if self._num_commits_behind > 1:
                    newest_text += 's'
                newest_text += ' behind)' + "&mdash; <a href=\"" + self.get_update_url() + "\">Update Now</a>"
    
            else:
                return
    
            sickbeard.NEWEST_VERSION_STRING = newest_text
    
        def need_update(self):
    
            if self.branch != self._find_installed_branch():
                logger.log(u"Branch checkout: " + self._find_installed_branch() + "->" + self.branch, logger.DEBUG)
                return True
    
            self._find_installed_version()
            if not self._cur_commit_hash:
                return True
            else:
                try:
                    self._check_github_for_update()
                except Exception, e:
                    logger.log(u"Unable to contact github, can't check for update: " + repr(e), logger.WARNING)
                    return False
    
                if self._num_commits_behind > 0:
                    return True
    
            return False
    
        def update(self):
            """
            Calls git pull origin <branch> in order to update SickRage. Returns a bool depending
            on the call's success.
            """
    
            # update remote origin url
            self.update_remote_origin()
    
            # remove untracked files and performs a hard reset on git branch to avoid update issues
            if sickbeard.GIT_RESET:
                self.clean()
                self.reset()
    
            if self.branch == self._find_installed_branch():
                output, err, exit_status = self._run_git(self._git_path, 'pull -f %s %s' % (sickbeard.GIT_REMOTE, self.branch))  # @UnusedVariable
            else:
                output, err, exit_status = self._run_git(self._git_path, 'checkout -f ' + self.branch)  # @UnusedVariable
    
            if exit_status == 0:
                self._find_installed_version()
    
                # Notify update successful
                if sickbeard.NOTIFY_ON_UPDATE:
                    notifiers.notify_git_update(sickbeard.CUR_COMMIT_HASH if sickbeard.CUR_COMMIT_HASH else "")
    
                return True
            else:
                return False
    
        def clean(self):
            """
            Calls git clean to remove all untracked files. Returns a bool depending
            on the call's success.
            """
            output, err, exit_status = self._run_git(self._git_path, 'clean -df ""')  # @UnusedVariable
            if exit_status == 0:
                return True
    
        def reset(self):
            """
            Calls git reset --hard to perform a hard reset. Returns a bool depending
            on the call's success.
            """
            output, err, exit_status = self._run_git(self._git_path, 'reset --hard')  # @UnusedVariable
            if exit_status == 0:
                return True
    
        def list_remote_branches(self):
            # update remote origin url
            self.update_remote_origin()
            sickbeard.BRANCH = self._find_installed_branch()
    
            branches, err, exit_status = self._run_git(self._git_path, 'ls-remote --heads %s' % sickbeard.GIT_REMOTE)  # @UnusedVariable
            if exit_status == 0 and branches:
                if branches:
                    return re.findall('\S+\Wrefs/heads/(.*)', branches)
            return []
    
        def update_remote_origin(self):
            self._run_git(self._git_path, 'config remote.%s.url %s' % (sickbeard.GIT_REMOTE, sickbeard.GIT_REMOTE_URL))
    
    class SourceUpdateManager(UpdateManager):
        def __init__(self):
            self.github_org = self.get_github_org()
            self.github_repo = self.get_github_repo()
    
            self.branch = sickbeard.BRANCH
            if sickbeard.BRANCH == '':
                self.branch = self._find_installed_branch()
    
            self._cur_commit_hash = sickbeard.CUR_COMMIT_HASH
            self._newest_commit_hash = None
            self._num_commits_behind = 0
    
        def _find_installed_branch(self):
            if sickbeard.CUR_COMMIT_BRANCH == "":
                return "master"
            else:
                return sickbeard.CUR_COMMIT_BRANCH
    
        def get_cur_commit_hash(self):
            return self._cur_commit_hash
    
        def get_newest_commit_hash(self):
            return self._newest_commit_hash
    
        def get_cur_version(self):
            return ""
    
        def get_newest_version(self):
            return ""
    
        def get_num_commits_behind(self):
            return self._num_commits_behind
    
        def need_update(self):
            # need this to run first to set self._newest_commit_hash
            try:
                self._check_github_for_update()
            except Exception, e:
                logger.log(u"Unable to contact github, can't check for update: " + repr(e), logger.WARNING)
                return False
    
            if self.branch != self._find_installed_branch():
                logger.log(u"Branch checkout: " + self._find_installed_branch() + "->" + self.branch, logger.DEBUG)
                return True
    
            if not self._cur_commit_hash or self._num_commits_behind > 0:
                return True
    
            return False
    
        def _check_github_for_update(self):
            """
            Uses pygithub to ask github if there is a newer version that the provided
            commit hash. If there is a newer version it sets SickRage's version text.
    
            commit_hash: hash that we're checking against
            """
    
            self._num_commits_behind = 0
            self._newest_commit_hash = None
    
            # try to get newest commit hash and commits behind directly by comparing branch and current commit
            if self._cur_commit_hash:
                branch_compared = sickbeard.gh.compare(base=self.branch, head=self._cur_commit_hash)
                self._newest_commit_hash = branch_compared.base_commit.sha
                self._num_commits_behind = branch_compared.behind_by
    
            # fall back and iterate over last 100 (items per page in gh_api) commits
            if not self._newest_commit_hash:
    
                for curCommit in sickbeard.gh.get_commits():
                    if not self._newest_commit_hash:
                        self._newest_commit_hash = curCommit.sha
                        if not self._cur_commit_hash:
                            break
    
                    if curCommit.sha == self._cur_commit_hash:
                        break
    
                    # when _cur_commit_hash doesn't match anything _num_commits_behind == 100
                    self._num_commits_behind += 1
    
            logger.log(u"cur_commit = " + str(self._cur_commit_hash) + u", newest_commit = " + str(self._newest_commit_hash)
                       + u", num_commits_behind = " + str(self._num_commits_behind), logger.DEBUG)
    
        def set_newest_text(self):
    
            # if we're up to date then don't set this
            sickbeard.NEWEST_VERSION_STRING = None
    
            if not self._cur_commit_hash:
                logger.log(u"Unknown current version number, don't know if we should update or not", logger.DEBUG)
    
                newest_text = "Unknown current version number: If you've never used the SickRage upgrade system before then current version is not set."
                newest_text += "&mdash; <a href=\"" + self.get_update_url() + "\">Update Now</a>"
    
            elif self._num_commits_behind > 0:
                base_url = 'http://github.com/' + self.github_org + '/' + self.github_repo
                if self._newest_commit_hash:
                    url = base_url + '/compare/' + self._cur_commit_hash + '...' + self._newest_commit_hash
                else:
                    url = base_url + '/commits/'
    
                newest_text = 'There is a <a href="' + url + '" onclick="window.open(this.href); return false;">newer version available</a>'
                newest_text += " (you're " + str(self._num_commits_behind) + " commit"
                if self._num_commits_behind > 1:
                    newest_text += "s"
                newest_text += " behind)" + "&mdash; <a href=\"" + self.get_update_url() + "\">Update Now</a>"
            else:
                return
    
            sickbeard.NEWEST_VERSION_STRING = newest_text
    
        def update(self):
            """
            Downloads the latest source tarball from github and installs it over the existing version.
            """
    
            base_url = 'http://github.com/' + self.github_org + '/' + self.github_repo
            tar_download_url = base_url + '/tarball/' + self.branch
    
            try:
                # prepare the update dir
                sr_update_dir = ek.ek(os.path.join, sickbeard.PROG_DIR, u'sr-update')
    
                if os.path.isdir(sr_update_dir):
                    logger.log(u"Clearing out update folder " + sr_update_dir + " before extracting")
                    shutil.rmtree(sr_update_dir)
    
                logger.log(u"Creating update folder " + sr_update_dir + " before extracting")
                os.makedirs(sr_update_dir)
    
                # retrieve file
                logger.log(u"Downloading update from " + repr(tar_download_url))
                tar_download_path = os.path.join(sr_update_dir, u'sr-update.tar')
                urllib.urlretrieve(tar_download_url, tar_download_path)
    
                if not ek.ek(os.path.isfile, tar_download_path):
                    logger.log(u"Unable to retrieve new version from " + tar_download_url + ", can't update", logger.WARNING)
                    return False
    
                if not ek.ek(tarfile.is_tarfile, tar_download_path):
                    logger.log(u"Retrieved version from " + tar_download_url + " is corrupt, can't update", logger.ERROR)
                    return False
    
                # extract to sr-update dir
                logger.log(u"Extracting file " + tar_download_path)
                tar = tarfile.open(tar_download_path)
                tar.extractall(sr_update_dir)
                tar.close()
    
                # delete .tar.gz
                logger.log(u"Deleting file " + tar_download_path)
                os.remove(tar_download_path)
    
                # find update dir name
                update_dir_contents = [x for x in os.listdir(sr_update_dir) if
                                       os.path.isdir(os.path.join(sr_update_dir, x))]
                if len(update_dir_contents) != 1:
                    logger.log(u"Invalid update data, update failed: " + str(update_dir_contents), logger.ERROR)
                    return False
                content_dir = os.path.join(sr_update_dir, update_dir_contents[0])
    
                # walk temp folder and move files to main folder
                logger.log(u"Moving files from " + content_dir + " to " + sickbeard.PROG_DIR)
                for dirname, dirnames, filenames in os.walk(content_dir):  # @UnusedVariable
                    dirname = dirname[len(content_dir) + 1:]
                    for curfile in filenames:
                        old_path = os.path.join(content_dir, dirname, curfile)
                        new_path = os.path.join(sickbeard.PROG_DIR, dirname, curfile)
    
                        # Avoid DLL access problem on WIN32/64
                        # These files needing to be updated manually
                        #or find a way to kill the access from memory
                        if curfile in ('unrar.dll', 'unrar64.dll'):
                            try:
                                os.chmod(new_path, stat.S_IWRITE)
                                os.remove(new_path)
                                os.renames(old_path, new_path)
                            except Exception, e:
                                logger.log(u"Unable to update " + new_path + ': ' + ex(e), logger.DEBUG)
                                os.remove(old_path)  # Trash the updated file without moving in new path
                            continue
    
                        if os.path.isfile(new_path):
                            os.remove(new_path)
                        os.renames(old_path, new_path)
    
                sickbeard.CUR_COMMIT_HASH = self._newest_commit_hash
                sickbeard.CUR_COMMIT_BRANCH = self.branch
                
            except Exception, e:
                logger.log(u"Error while trying to update: " + ex(e), logger.ERROR)
                logger.log(u"Traceback: " + traceback.format_exc(), logger.DEBUG)
                return False
    
            # Notify update successful
            notifiers.notify_git_update(sickbeard.NEWEST_VERSION_STRING)
    
            return True
    
        def list_remote_branches(self):
            return [x.name for x in sickbeard.gh.get_branches() if x]