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sourceslist.py
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# sourceslist.py - Provide an abstraction of the sources.list # # Copyright (c) 2004-2009 Canonical Ltd. # Copyright (c) 2004 Michiel Sikkes # Copyright (c) 2006-2007 Sebastian Heinlein # # Authors: Michiel Sikkes <michiel@eyesopened.nl> # Michael Vogt <mvo@debian.org> # Sebastian Heinlein <glatzor@ubuntu.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 from __future__ import absolute_import, print_function import glob import logging import os.path import re import shutil import time import apt_pkg from .distinfo import DistInfo #from apt_pkg import gettext as _ # some global helpers __all__ = ['is_mirror', 'SourceEntry', 'NullMatcher', 'SourcesList', 'SourceEntryMatcher'] def is_mirror(master_uri, compare_uri): """ check if the given add_url is idential or a mirror of orig_uri e.g.: master_uri = archive.ubuntu.com compare_uri = de.archive.ubuntu.com -> True """ # remove traling spaces and "/" compare_uri = compare_uri.rstrip("/ ") master_uri = master_uri.rstrip("/ ") # uri is identical if compare_uri == master_uri: #print "Identical" return True # add uri is a master site and orig_uri has the from "XX.mastersite" # (e.g. de.archive.ubuntu.com) try: compare_srv = compare_uri.split("//")[1] master_srv = master_uri.split("//")[1] #print "%s == %s " % (add_srv, orig_srv) except IndexError: # ok, somethings wrong here #print "IndexError" return False # remove the leading "<country>." (if any) and see if that helps if "." in compare_srv and \ compare_srv[compare_srv.index(".") + 1:] == master_srv: #print "Mirror" return True return False def uniq(s): """ simple and efficient way to return uniq collection This is not intended for use with a SourceList. It is provided for internal use only. It does not have a leading underscore to not break any old code that uses it; but it should not be used in new code (and is not listed in __all__).""" return list(set(s)) class SourceEntry(object): """ single sources.list entry """ def __init__(self, line, file=None): self.invalid = False # is the source entry valid self.disabled = False # is it disabled ('#' in front) self.type = "" # what type (deb, deb-src) self.architectures = [] # architectures self.trusted = None # Trusted self.uri = "" # base-uri self.dist = "" # distribution (dapper, edgy, etc) self.comps = [] # list of available componetns (may empty) self.comment = "" # (optional) comment self.line = line # the original sources.list line if file is None: file = apt_pkg.config.find_dir( "Dir::Etc") + apt_pkg.config.find("Dir::Etc::sourcelist") self.file = file # the file that the entry is located in self.parse(line) self.template = None # type DistInfo.Suite self.children = [] def __eq__(self, other): """ equal operator for two sources.list entries """ return (self.disabled == other.disabled and self.type == other.type and self.uri.rstrip('/') == other.uri.rstrip('/') and self.dist == other.dist and self.comps == other.comps) def mysplit(self, line): """ a split() implementation that understands the sources.list format better and takes [] into account (for e.g. cdroms) """ line = line.strip() pieces = [] tmp = "" # we are inside a [..] block p_found = False space_found = False for i in range(len(line)): if line[i] == "[": if space_found: space_found = False p_found = True pieces.append(tmp) tmp = line[i] else: p_found = True tmp += line[i] elif line[i] == "]": p_found = False tmp += line[i] elif space_found and not line[i].isspace(): # we skip one or more space space_found = False pieces.append(tmp) tmp = line[i] elif line[i].isspace() and not p_found: # found a whitespace space_found = True else: tmp += line[i] # append last piece if len(tmp) > 0: pieces.append(tmp) return pieces def parse(self, line): """ parse a given sources.list (textual) line and break it up into the field we have """ self.line = line line = line.strip() # check if the source is enabled/disabled if line == "" or line == "#": # empty line self.invalid = True return if line[0] == "#": self.disabled = True pieces = line[1:].strip().split() # if it looks not like a disabled deb line return if not pieces[0] in ("rpm", "rpm-src", "deb", "deb-src"): self.invalid = True return else: line = line[1:] # check for another "#" in the line (this is treated as a comment) i = line.find("#") if i > 0: self.comment = line[i + 1:] line = line[:i] # source is ok, split it and see what we have pieces = self.mysplit(line) # Sanity check if len(pieces) < 3: self.invalid = True return # Type, deb or deb-src self.type = pieces[0].strip() # Sanity check if self.type not in ("deb", "deb-src", "rpm", "rpm-src"): self.invalid = True return if pieces[1].strip()[0] == "[": options = pieces.pop(1).strip("[]").split() for option in options: try: key, value = option.split("=", 1) except Exception: self.invalid = True else: if key == "arch": self.architectures = value.split(",") elif key == "trusted": self.trusted = apt_pkg.string_to_bool(value) else: self.invalid = True # URI self.uri = pieces[1].strip() if len(self.uri) < 1: self.invalid = True # distro and components (optional) # Directory or distro self.dist = pieces[2].strip() if len(pieces) > 3: # List of components self.comps = pieces[3:] else: self.comps = [] def set_enabled(self, new_value): """ set a line to enabled or disabled """ self.disabled = not new_value # enable, remove all "#" from the start of the line if new_value: self.line = self.line.lstrip().lstrip('#') else: # disabled, add a "#" if self.line.strip()[0] != "#": self.line = "#" + self.line def __str__(self): """ debug helper """ return self.str().strip() def str(self): """ return the current line as string """ if self.invalid: return self.line line = "" if self.disabled: line = "# " line += self.type if self.architectures and self.trusted is not None: line += " [arch=%s trusted=%s]" % ( ",".join(self.architectures), "yes" if self.trusted else "no") elif self.trusted is not None: line += " [trusted=%s]" % ("yes" if self.trusted else "no") elif self.architectures: line += " [arch=%s]" % ",".join(self.architectures) line += " %s %s" % (self.uri, self.dist) if len(self.comps) > 0: line += " " + " ".join(self.comps) if self.comment != "": line += " #" + self.comment line += "\n" return line class NullMatcher(object): """ a Matcher that does nothing """ def match(self, s): return True class SourcesList(object): """ represents the full sources.list + sources.list.d file """ def __init__(self, withMatcher=True, matcherPath="/usr/share/python-apt/templates/"): self.list = [] # the actual SourceEntries Type if withMatcher: self.matcher = SourceEntryMatcher(matcherPath) else: self.matcher = NullMatcher() self.refresh() def refresh(self): """ update the list of known entries """ self.list = [] # read sources.list file = apt_pkg.config.find_file("Dir::Etc::sourcelist") if os.path.exists(file): self.load(file) # read sources.list.d partsdir = apt_pkg.config.find_dir("Dir::Etc::sourceparts") for file in glob.glob("%s/*.list" % partsdir): self.load(file) # check if the source item fits a predefined template for source in self.list: if not source.invalid: self.matcher.match(source) def __iter__(self): """ simple iterator to go over self.list, returns SourceEntry types """ for entry in self.list: yield entry def __find(self, *predicates, **attrs): uri = attrs.pop('uri', None) for source in self.list: if uri and uri.rstrip('/') != source.uri.rstrip('/'): continue if (all(getattr(source, key) == attrs[key] for key in attrs) and all(predicate(source) for predicate in predicates)): yield source def add(self, type, uri, dist, orig_comps, comment="", pos=-1, file=None, architectures=[]): """ Add a new source to the sources.list. The method will search for existing matching repos and will try to reuse them as far as possible """ type = type.strip() disabled = type.startswith("#") if disabled: type = type[1:].lstrip() architectures = set(architectures) # create a working copy of the component list so that # we can modify it later comps = orig_comps[:] sources = self.__find(lambda s: set(s.architectures) == architectures, disabled=disabled, invalid=False, type=type, uri=uri, dist=dist) # check if we have this source already in the sources.list for source in sources: for new_comp in comps: if new_comp in source.comps: # we have this component already, delete it # from the new_comps list del comps[comps.index(new_comp)] if len(comps) == 0: return source sources = self.__find(lambda s: set(s.architectures) == architectures, invalid=False, type=type, uri=uri, dist=dist) for source in sources: if source.disabled == disabled: # if there is a repo with the same (disabled, type, uri, dist) # just add the components if set(source.comps) != set(comps): source.comps = uniq(source.comps + comps) return source elif source.disabled and not disabled: # enable any matching (type, uri, dist), but disabled repo if set(source.comps) == set(comps): source.disabled = False return source # there isn't any matching source, so create a new line and parse it parts = [ "#" if disabled else "", type, ("[arch=%s]" % ",".join(architectures)) if architectures else "", uri, dist, ] parts.extend(comps) if comment: parts.append("#" + comment) line = " ".join(part for part in parts if part) + "\n" new_entry = SourceEntry(line) if file is not None: new_entry.file = file self.matcher.match(new_entry) if pos < 0: self.list.append(new_entry) else: self.list.insert(pos, new_entry) return new_entry def remove(self, source_entry): """ remove the specified entry from the sources.list """ self.list.remove(source_entry) def restore_backup(self, backup_ext): " restore sources.list files based on the backup extension " file = apt_pkg.config.find_file("Dir::Etc::sourcelist") if os.path.exists(file + backup_ext) and os.path.exists(file): shutil.copy(file + backup_ext, file) # now sources.list.d partsdir = apt_pkg.config.find_dir("Dir::Etc::sourceparts") for file in glob.glob("%s/*.list" % partsdir): if os.path.exists(file + backup_ext): shutil.copy(file + backup_ext, file) def backup(self, backup_ext=None): """ make a backup of the current source files, if no backup extension is given, the current date/time is used (and returned) """ already_backuped = set() if backup_ext is None: backup_ext = time.strftime("%y%m%d.%H%M") for source in self.list: if (source.file not in already_backuped and os.path.exists(source.file)): shutil.copy(source.file, "%s%s" % (source.file, backup_ext)) return backup_ext def load(self, file): """ (re)load the current sources """ try: with open(file, "r") as f: for line in f: source = SourceEntry(line, file) self.list.append(source) except Exception: logging.warning("could not open file '%s'\n" % file) def save(self): """ save the current sources """ files = {} # write an empty default config file if there aren't any sources if len(self.list) == 0: path = apt_pkg.config.find_file("Dir::Etc::sourcelist") header = ( "## See sources.list(5) for more information, especialy\n" "# Remember that you can only use http, ftp or file URIs\n" "# CDROMs are managed through the apt-cdrom tool.\n") with open(path, "w") as f: f.write(header) return try: for source in self.list: if source.file not in files: files[source.file] = open(source.file, "w") files[source.file].write(source.str()) finally: for f in files: files[f].close() def check_for_relations(self, sources_list): """get all parent and child channels in the sources list""" parents = [] used_child_templates = {} for source in sources_list: # try to avoid checking uninterressting sources if source.template is None: continue # set up a dict with all used child templates and corresponding # source entries if source.template.child: key = source.template if key not in used_child_templates: used_child_templates[key] = [] temp = used_child_templates[key] temp.append(source) else: # store each source with children aka. a parent :) if len(source.template.children) > 0: parents.append(source) #print self.used_child_templates #print self.parents return (parents, used_child_templates) class SourceEntryMatcher(object): """ matcher class to make a source entry look nice lots of predefined matchers to make it i18n/gettext friendly """ def __init__(self, matcherPath): self.templates = [] # Get the human readable channel and comp names from the channel .infos spec_files = glob.glob("%s/*.info" % matcherPath) for f in spec_files: f = os.path.basename(f) i = f.find(".info") f = f[0:i] dist = DistInfo(f, base_dir=matcherPath) for template in dist.templates: if template.match_uri is not None: self.templates.append(template) return def match(self, source): """Add a matching template to the source""" found = False for template in self.templates: if (re.search(template.match_uri, source.uri) and re.match(template.match_name, source.dist) and # deb is a valid fallback for deb-src (if that is not # definied, see #760035 (source.type == template.type or template.type == "deb")): found = True source.template = template break elif (template.is_mirror(source.uri) and re.match(template.match_name, source.dist)): found = True source.template = template break return found # some simple tests if __name__ == "__main__": apt_pkg.init_config() sources = SourcesList() for entry in sources: logging.info("entry %s" % entry.str()) #print entry.uri mirror = is_mirror("http://archive.ubuntu.com/ubuntu/", "http://de.archive.ubuntu.com/ubuntu/") logging.info("is_mirror(): %s" % mirror) logging.info(is_mirror("http://archive.ubuntu.com/ubuntu", "http://de.archive.ubuntu.com/ubuntu/")) logging.info(is_mirror("http://archive.ubuntu.com/ubuntu/", "http://de.archive.ubuntu.com/ubuntu"))