/brz/remove-bazaar

# Copyright (C) 2005 by Canonical Ltd

#   Authors: Robert Collins <robert.collins@canonical.com>

#

# This program 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 2 of the License, or

# (at your option) any later version.

#

# This program 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 this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""Configuration that affects the behaviour of Bazaar.

Currently this configuration resides in ~/.bazaar/bazaar.conf

and ~/.bazaar/branches.conf, which is written to by bzr.

In bazaar.conf the following options may be set:

[DEFAULT]

editor=name-of-program

email=Your Name <your@email.address>

check_signatures=require|ignore|check-available(default)

create_signatures=always|never|when-required(default)

gpg_signing_command=name-of-program

in branches.conf, you specify the url of a branch and options for it.

Wildcards may be used - * and ? as normal in shell completion. Options

set in both bazaar.conf and branches.conf are overriden by the branches.conf

setting.

[/home/robertc/source]

recurse=False|True(default)

email= as above

check_signatures= as abive 

create_signatures= as above.

explanation of options

----------------------

editor - this option sets the pop up editor to use during commits.

email - this option sets the user id bzr will use when committing.

check_signatures - this option controls whether bzr will require good gpg

                   signatures, ignore them, or check them if they are 

                   present.

create_signatures - this option controls whether bzr will always create 

                    gpg signatures, never create them, or create them if the

                    branch is configured to require them.

                    NB: This option is planned, but not implemented yet.

"""

import errno

import os

from fnmatch import fnmatch

import re

import bzrlib

import bzrlib.errors as errors

import bzrlib.util.configobj.configobj as configobj

from StringIO import StringIO

CHECK_IF_POSSIBLE=0

CHECK_ALWAYS=1

CHECK_NEVER=2

class ConfigObj(configobj.ConfigObj):

    def get_bool(self, section, key):

        val = self[section][key].lower()

        if val in ('1', 'yes', 'true', 'on'):

            return True

        elif val in ('0', 'no', 'false', 'off'):

            return False

        else:

            raise ValueError("Value %r is not boolean" % val)

    def get_value(self, section, name):

        # Try [] for the old DEFAULT section.

        if section == "DEFAULT":

            try:

                return self[name]

            except KeyError:

                pass

        return self[section][name]

class Config(object):

    """A configuration policy - what username, editor, gpg needs etc."""

    def get_editor(self):

        """Get the users pop up editor."""

        raise NotImplementedError

    def _get_signature_checking(self):

        """Template method to override signature checking policy."""

    def _get_user_option(self, option_name):

        """Template method to provide a user option."""

        return None

    def get_user_option(self, option_name):

        """Get a generic option - no special process, no default."""

        return self._get_user_option(option_name)

    def gpg_signing_command(self):

        """What program should be used to sign signatures?"""

        result = self._gpg_signing_command()

        if result is None:

            result = "gpg"

        return result

    def _gpg_signing_command(self):

        """See gpg_signing_command()."""

        return None

    def __init__(self):

        super(Config, self).__init__()

    def post_commit(self):

        """An ordered list of python functions to call.

        Each function takes branch, rev_id as parameters.

        """

        return self._post_commit()

    def _post_commit(self):

        """See Config.post_commit."""

        return None

    def user_email(self):

        """Return just the email component of a username."""

        return extract_email_address(self.username())

    def username(self):

        """Return email-style username.

        Something similar to 'Martin Pool <mbp@sourcefrog.net>'

        $BZREMAIL can be set to override this, then

        the concrete policy type is checked, and finally

        $EMAIL is examined.

        If none is found, a reasonable default is (hopefully)

        created.

        TODO: Check it's reasonably well-formed.

        """

        v = os.environ.get('BZREMAIL')

        if v:

            return v.decode(bzrlib.user_encoding)

        v = self._get_user_id()

        if v:

            return v

        v = os.environ.get('EMAIL')

        if v:

            return v.decode(bzrlib.user_encoding)

        name, email = _auto_user_id()

        if name:

            return '%s <%s>' % (name, email)

        else:

            return email

    def signature_checking(self):

        """What is the current policy for signature checking?."""

        policy = self._get_signature_checking()

        if policy is not None:

            return policy

        return CHECK_IF_POSSIBLE

    def signature_needed(self):

        """Is a signature needed when committing ?."""

        policy = self._get_signature_checking()

        if policy == CHECK_ALWAYS:

            return True

        return False

class IniBasedConfig(Config):

    """A configuration policy that draws from ini files."""

    def _get_parser(self, file=None):

        if self._parser is not None:

            return self._parser

        if file is None:

            input = self._get_filename()

        else:

            input = file

        try:

            self._parser = ConfigObj(input)

        except configobj.ConfigObjError, e:

            raise errors.ParseConfigError(e.errors, e.config.filename)

        return self._parser

    def _get_section(self):

        """Override this to define the section used by the config."""

        return "DEFAULT"

    def _get_signature_checking(self):

        """See Config._get_signature_checking."""

        policy = self._get_user_option('check_signatures')

        if policy:

            return self._string_to_signature_policy(policy)

    def _get_user_id(self):

        """Get the user id from the 'email' key in the current section."""

        return self._get_user_option('email')

    def _get_user_option(self, option_name):

        """See Config._get_user_option."""

        try:

            return self._get_parser().get_value(self._get_section(),

                                                option_name)

        except KeyError:

            pass

    def _gpg_signing_command(self):

        """See Config.gpg_signing_command."""

        return self._get_user_option('gpg_signing_command')

    def __init__(self, get_filename):

        super(IniBasedConfig, self).__init__()

        self._get_filename = get_filename

        self._parser = None

    def _post_commit(self):

        """See Config.post_commit."""

        return self._get_user_option('post_commit')

    def _string_to_signature_policy(self, signature_string):

        """Convert a string to a signing policy."""

        if signature_string.lower() == 'check-available':

            return CHECK_IF_POSSIBLE

        if signature_string.lower() == 'ignore':

            return CHECK_NEVER

        if signature_string.lower() == 'require':

            return CHECK_ALWAYS

        raise errors.BzrError("Invalid signatures policy '%s'"

                              % signature_string)

class GlobalConfig(IniBasedConfig):

    """The configuration that should be used for a specific location."""

    def get_editor(self):

        return self._get_user_option('editor')

    def __init__(self):

        super(GlobalConfig, self).__init__(config_filename)

class LocationConfig(IniBasedConfig):

    """A configuration object that gives the policy for a location."""

    def __init__(self, location):

        super(LocationConfig, self).__init__(branches_config_filename)

        self._global_config = None

        self.location = location

    def _get_global_config(self):

        if self._global_config is None:

            self._global_config = GlobalConfig()

        return self._global_config

    def _get_section(self):

        """Get the section we should look in for config items.

        Returns None if none exists. 

        TODO: perhaps return a NullSection that thunks through to the 

              global config.

        """

        sections = self._get_parser()

        location_names = self.location.split('/')

        if self.location.endswith('/'):

            del location_names[-1]

        matches=[]

        for section in sections:

            section_names = section.split('/')

            if section.endswith('/'):

                del section_names[-1]

            names = zip(location_names, section_names)

            matched = True

            for name in names:

                if not fnmatch(name[0], name[1]):

                    matched = False

                    break

            if not matched:

                continue

            # so, for the common prefix they matched.

            # if section is longer, no match.

            if len(section_names) > len(location_names):

                continue

            # if path is longer, and recurse is not true, no match

            if len(section_names) < len(location_names):

                try:

                    if not self._get_parser().get_bool(section, 'recurse'):

                        continue

                except KeyError:

                    pass

            matches.append((len(section_names), section))

        if not len(matches):

            return None

        matches.sort(reverse=True)

        return matches[0][1]

    def _gpg_signing_command(self):

        """See Config.gpg_signing_command."""

        command = super(LocationConfig, self)._gpg_signing_command()

        if command is not None:

            return command

        return self._get_global_config()._gpg_signing_command()

    def _get_user_id(self):

        user_id = super(LocationConfig, self)._get_user_id()

        if user_id is not None:

            return user_id

        return self._get_global_config()._get_user_id()

    def _get_user_option(self, option_name):

        """See Config._get_user_option."""

        option_value = super(LocationConfig, 

                             self)._get_user_option(option_name)

        if option_value is not None:

            return option_value

        return self._get_global_config()._get_user_option(option_name)

    def _get_signature_checking(self):

        """See Config._get_signature_checking."""

        check = super(LocationConfig, self)._get_signature_checking()

        if check is not None:

            return check

        return self._get_global_config()._get_signature_checking()

    def _post_commit(self):

        """See Config.post_commit."""

        hook = self._get_user_option('post_commit')

        if hook is not None:

            return hook

        return self._get_global_config()._post_commit()

    def set_user_option(self, option, value):

        """Save option and its value in the configuration."""

        # FIXME: RBC 20051029 This should refresh the parser and also take a

        # file lock on branches.conf.

        if not os.path.isdir(os.path.dirname(self._get_filename())):

            os.mkdir(os.path.dirname(self._get_filename()))

        location = self.location

        if location.endswith('/'):

            location = location[:-1]

        if (not location in self._get_parser() and

            not location + '/' in self._get_parser()):

            self._get_parser()[location]={}

        elif location + '/' in self._get_parser():

            location = location + '/'

        self._get_parser()[location][option]=value

        self._get_parser().write()

class BranchConfig(Config):

    """A configuration object giving the policy for a branch."""

    def _get_location_config(self):

        if self._location_config is None:

            self._location_config = LocationConfig(self.branch.base)

        return self._location_config

    def _get_user_id(self):

        """Return the full user id for the branch.

        e.g. "John Hacker <jhacker@foo.org>"

        This is looked up in the email controlfile for the branch.

        """

        try:

            return (self.branch.controlfile("email", "r") 

                    .read()

                    .decode(bzrlib.user_encoding)

                    .rstrip("\r\n"))

        except errors.NoSuchFile, e:

            pass

        return self._get_location_config()._get_user_id()

    def _get_signature_checking(self):

        """See Config._get_signature_checking."""

        return self._get_location_config()._get_signature_checking()

    def _get_user_option(self, option_name):

        """See Config._get_user_option."""

        return self._get_location_config()._get_user_option(option_name)

    def _gpg_signing_command(self):

        """See Config.gpg_signing_command."""

        return self._get_location_config()._gpg_signing_command()

    def __init__(self, branch):

        super(BranchConfig, self).__init__()

        self._location_config = None

        self.branch = branch

    def _post_commit(self):

        """See Config.post_commit."""

        return self._get_location_config()._post_commit()

def config_dir():

    """Return per-user configuration directory.

    By default this is ~/.bazaar/

    TODO: Global option --config-dir to override this.

    """

    return os.path.join(os.path.expanduser("~"), ".bazaar")

def config_filename():

    """Return per-user configuration ini file filename."""

    return os.path.join(config_dir(), 'bazaar.conf')

def branches_config_filename():

    """Return per-user configuration ini file filename."""

    return os.path.join(config_dir(), 'branches.conf')

def _auto_user_id():

    """Calculate automatic user identification.

    Returns (realname, email).

    Only used when none is set in the environment or the id file.

    This previously used the FQDN as the default domain, but that can

    be very slow on machines where DNS is broken.  So now we simply

    use the hostname.

    """

    import socket

    # XXX: Any good way to get real user name on win32?

    try:

        import pwd

        uid = os.getuid()

        w = pwd.getpwuid(uid)

        gecos = w.pw_gecos.decode(bzrlib.user_encoding)

        username = w.pw_name.decode(bzrlib.user_encoding)

        comma = gecos.find(',')

        if comma == -1:

            realname = gecos

        else:

            realname = gecos[:comma]

        if not realname:

            realname = username

    except ImportError:

        import getpass

        realname = username = getpass.getuser().decode(bzrlib.user_encoding)

    return realname, (username + '@' + socket.gethostname())

def extract_email_address(e):

    """Return just the address part of an email string.

    That is just the user@domain part, nothing else. 

    This part is required to contain only ascii characters.

    If it can't be extracted, raises an error.

    >>> extract_email_address('Jane Tester <jane@test.com>')

    "jane@test.com"

    """

    m = re.search(r'[\w+.-]+@[\w+.-]+', e)

    if not m:

        raise errors.BzrError("%r doesn't seem to contain "

                              "a reasonable email address" % e)

    return m.group(0)

class TreeConfig(object):

    """Branch configuration data associated with its contents, not location"""

    def __init__(self, branch):

        self.branch = branch

    def _get_config(self):

        try:

            obj = ConfigObj(self.branch.controlfile('branch.conf',

                                                    'rb').readlines())

            obj.decode('UTF-8')

        except errors.NoSuchFile:

            obj = ConfigObj()

        return obj

    def get_option(self, name, section=None, default=None):

        self.branch.lock_read()

        try:

            obj = self._get_config()

            try:

                if section is not None:

                    obj[section]

                result = obj[name]

            except KeyError:

                result = default

        finally:

            self.branch.unlock()

        return result

    def set_option(self, value, name, section=None):

        """Set a per-branch configuration option"""

        self.branch.lock_write()

        try:

            cfg_obj = self._get_config()

            if section is None:

                obj = cfg_obj

            else:

                try:

                    obj = cfg_obj[section]

                except KeyError:

                    cfg_obj[section] = {}

                    obj = cfg_obj[section]

            obj[name] = value

            cfg_obj.encode('UTF-8')

            out_file = StringIO(''.join([l+'\n' for l in cfg_obj.write()]))

            out_file.seek(0)

            self.branch.put_controlfile('branch.conf', out_file, encode=False)

        finally:

            self.branch.unlock()