~fginther/charms/precise/juju-local/ppa-pinning

# Copyright 2014 Canonical Ltd. All rights reserved.

import os

import re

import sys

import errno

import hashlib

import subprocess

import optparse

import urllib

from os import curdir

from bzrlib.branch import Branch

from bzrlib.plugin import load_plugins

load_plugins()

from bzrlib.plugins.launchpad import account as lp_account

if 'GlobalConfig' in dir(lp_account):

    from bzrlib.config import LocationConfig as LocationConfiguration

    _ = LocationConfiguration

else:

    from bzrlib.config import LocationStack as LocationConfiguration

    _ = LocationConfiguration

def get_ubunet_branch_config(config_file):

    """

    Retrieves the sourcedeps configuration for an ubunet source dir.

    Returns a dict of (branch, revspec) tuples, keyed by branch name.

    """

    branches = {}

    with open(config_file, 'r') as stream:

        for line in stream:

            line = line.split('#')[0].strip()

            match = re.match(r'(\S+)\s+'

                             'bzr\+ssh://([^/]+)/([^;]+)'

                             '(?:;revno=(\d+))?', line)

            if match:

                name, host, branch, revno = match.group(1, 2, 3, 4)

                if revno is None:

                    revspec = "-1"

                else:

                    revspec = revno

                branches[name] = (host, branch, revspec)

    return branches

def main(config_file, parent_dir, target_dir, verbose):

    """Do the deed."""

    try:

        os.makedirs(parent_dir)

    except OSError, e:

        if e.errno != errno.EEXIST:

            raise

    bzr_config = LocationConfiguration(parent_dir)

    get_lp_login = lp_account.get_lp_login

    username = get_lp_login(bzr_config) or get_lp_login()

    if username is None:

        raise RuntimeError("Unable to determine launchpad login")

    quoted_username = urllib.quote(username)

    branches = sorted(get_ubunet_branch_config(config_file).iteritems())

    for branch_name, (host, quoted_branch_spec, revspec) in branches:

        revno = int(revspec)

        # qualify mirror branch name with hash of remote repo path to deal

        # with changes to the remote branch URL over time

        branch_spec_digest = hashlib.sha1(quoted_branch_spec).hexdigest()

        branch_directory = branch_spec_digest

        source_path = os.path.join(parent_dir, branch_directory)

        destination_path = os.path.join(target_dir, branch_name)

        # Remove leftover symlinks/stray files.

        try:

            os.remove(destination_path)

        except OSError, e:

            if e.errno != errno.EISDIR and e.errno != errno.ENOENT:

                raise

        branch_url = ("bzr+ssh://%s@%s/%s" %

                      (quoted_username, host, quoted_branch_spec))

        lp_url = "lp:" + quoted_branch_spec.replace("+branch/", "")

        # Create the local mirror branch if it doesn't already exist

        if verbose:

            sys.stderr.write('%30s: ' % (branch_name,))

            sys.stderr.flush()

        fresh = False

        if not os.path.exists(source_path):

            subprocess.check_call(['bzr', 'branch', '-q',

                                   '--', branch_url, source_path])

            fresh = True

        source_branch = Branch.open(source_path)

        # Freshen the source branch if required (-1 means we want tip).

        if not fresh and (revno == -1 or revno > source_branch.revno()):

            subprocess.check_call(['bzr', 'pull', '-q', '--overwrite', '-r',

                                   str(revno), '-d', source_path,

                                   '--', branch_url])

        if os.path.exists(destination_path):

            # Overwrite the destination with the appropriate revision.

            subprocess.check_call(['bzr', 'clean-tree', '--force', '-q',

                                   '--ignored', '-d', destination_path])

            subprocess.check_call(['bzr', 'pull', '-q', '--overwrite',

                                   '-r', str(revno),

                                   '-d', destination_path, '--', source_path])

        else:

            # Create a new branch.

            subprocess.check_call(['bzr', 'branch', '-q', '--hardlink',

                                   '-r', str(revno),

                                   '--', source_path, destination_path])

        # Check the state of the destination branch.

        destination_branch = Branch.open(destination_path)

        destination_revno = destination_branch.revno()

        if verbose:

            sys.stderr.write('checked out %4s of %s\n' %

                             ("r" + str(destination_revno), lp_url))

            sys.stderr.flush()

        if revno != -1 and destination_revno != revno:

            raise RuntimeError("Expected revno %d but got revno %d" %

                               (revno, destination_revno))

if __name__ == '__main__':

    parser = optparse.OptionParser(

        usage="%prog [options]",

        description=(

            "Add a lightweight checkout in <target> for each "

            "corresponding file in <parent>."),

        add_help_option=False)

    parser.add_option(

        '-p', '--parent', dest='parent', default=None,

        help=("The directory of the parent tree."),

        metavar="DIR")

    parser.add_option(

        '-t', '--target', dest='target', default=curdir,

        help=("The directory of the target tree."),

        metavar="DIR")

    parser.add_option(

        '-c', '--config', dest='config', default=None,

        help=("The config file to be used for config-manager."),

        metavar="DIR")

    parser.add_option(

        '-q', '--quiet', dest='verbose', action='store_false',

        help="Be less verbose.")

    parser.add_option(

        '-h', '--help', action='help',

        help="Show this help message and exit.")

    parser.set_defaults(verbose=True)

    options, args = parser.parse_args()

    if options.parent is None:

        parser.error(

            "Parent directory not specified.")

    if options.target is None:

        parser.error(

            "Target directory not specified.")

    sys.exit(main(config_file=options.config,

                  parent_dir=options.parent,

                  target_dir=options.target,

                  verbose=options.verbose))