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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def run(self):

 """ Run all the git-up stuff. """

        try:
            if self.should_fetch:
                self.fetch()

            self.rebase_all_branches()

            if self.with_bundler():
                self.check_bundler()

            if self.settings['push.auto']:
                self.push()

        except GitError as error:
            self.print_error(error)

            # Used for test cases
            if self.testing:
                raise
            else:  # pragma: no cover
                sys.exit(1)