Initial commit.

Signed-off-by: Eugenio Paolantonio (g7) <[email protected]>

README.md

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+libchannels
+===========
+
+libchannels is a python library that permits to easily manage Semplice's
+update channels.

base.provider

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+[provider]
+name = Base system
+description = Provider for the base system

dryrun.py

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+#!/usr/bin/python3
+# -*- coding: utf-8 -*-
+
+import libchannels.discovery
+
+discovery = libchannels.discovery.ChannelDiscovery()
+
+discovery.discover()
+
+
+print(discovery.channels)

jessie.channel

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+[channel]
+name = Debian 8.0
+description = Channel providing Debian 8.0 jessie with updates
+provides = base
+
+[main]
+default_mirror = http://ftp.debian.org/debian/
+origin = Debian
+codename = jessie
+components = main contrib non-free
+
+[updates]
+default_mirror = http://ftp.debian.org/debian/
+origin = Debian
+codename = jessie-updates
+components = main contrib non-free
+
+[security]
+default_mirror = http://security.debian.org/
+origin = Debian
+codename = jessie
+components = updates/main updates/contrib updates/non-free

libchannels/channel.py

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+# -*- coding: utf-8 -*-
+#
+# libchannels - update channels management library
+# Copyright (C) 2015 Eugenio "g7" Paolantonio
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+#
+
+import configparser
+
+from aptsources.sourceslist import SourceEntry
+
+class Channel(configparser.ConfigParser):
+
+	"""
+	A Channel is, basically, a set of Debian repositories with Dependency
+	and "Provider" support.
+	
+	A channel should have the ".channel" extension and it should look like this:
+	
+		[channel]
+		name = Channel name
+		description = Channel description
+		depends = eventual-dependencies
+		provides = eventual-provider
+		
+		[repo1]
+		default_mirror = http://path/to/mirror
+		origin = Repository origin, as given in the Release file
+		codename = distribution codename
+		components = repository components
+
+		[repo2]
+		default_mirror = http://path/to/mirror
+		origin = Repository origin, as given in the Release file
+		codename = distribution codename
+		components = repository components
+		
+		[repo3]
+		...
+	
+	Enabling a channel will enable every repository in the set.
+	"""
+
+	def __init__(self, channel_name):
+		"""
+		Initializes the class.
+		"""
+
+		super().__init__()
+
+		self.repositories = {}
+
+		self.channel_name = channel_name
+
+		self.read("./%s.channel" % channel_name) # FIXME: Should properly retrieve the path!
+
+		# Build repository dictionary
+		for repository in self.sections():
+			if repository == "channel":
+				continue
+
+			self.repositories[repository] = None # check() will eventually change that to the appropriate SourceEntry
+
+	def __str__(self):
+		"""
+		Returns a stringified version of the object.
+		"""
+
+		return self["channel"]["name"]
+
+	def check(self, origin, label, codename, source_entry):
+		"""
+		Returns True if the given InRelease file stream 
+		"""
+
+		for repository in self.repositories:
+
+			#print(self["channel"]["name"], origin, codename, source_entry)
+
+			if origin != self[repository]["origin"]:
+				continue
+
+			if codename != self[repository]["codename"]:
+				continue
+
+			#if label != self[repository]["label"]:
+			#	continue
+
+			# Good!
+			self.repositories[repository] = source_entry
+
+	@property
+	def enabled(self):
+		"""
+		Returns True if the channel is enabled, False if not.
+		"""
+
+		#return (not (None in self.repositories.values()))
+		return (not (False in [(type(x) == SourceEntry) for x in self.repositories.values()]))

libchannels/common.py

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+# -*- coding: utf-8 -*-
+#
+# libchannels - update channels management library
+# Copyright (C) 2015 Eugenio "g7" Paolantonio
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+#
+
+import aptsources.sourceslist
+
+sourceslist = aptsources.sourceslist.SourcesList()

libchannels/config.py

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+# -*- coding: utf-8 -*-
+#
+# libchannels - update channels management library
+# Copyright (C) 2015 Eugenio "g7" Paolantonio
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+#
+
+CHANNEL_SEARCH_PATH = "./"

libchannels/discovery.py

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+# -*- coding: utf-8 -*-
+#
+# libchannels - update channels management library
+# Copyright (C) 2015 Eugenio "g7" Paolantonio
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+#
+
+import os
+
+import libchannels.channel
+import libchannels.common
+import libchannels.config
+
+class ChannelDiscovery:
+
+	"""
+	The ChannelDiscovery() class permits to discover every enabled channel
+	and is used to get a precise status of a given channel.
+	"""
+
+	channels = {}
+
+	def __init__(self):
+		"""
+		Initializes the class.
+		"""
+
+		pass
+
+	def discover(self):
+		"""
+		Discovers the currently enabled channels.
+		"""
+
+		cache = {}
+
+		# Pre-load channels
+		for channel in os.listdir(libchannels.config.CHANNEL_SEARCH_PATH):
+
+			if not channel.endswith(".channel"):
+				continue
+
+			# Obtain name
+			channel = channel.replace(".channel","")
+
+			cache[channel] = libchannels.channel.Channel(channel)
+
+		# Loop through enabled repositories to get a list of enabled channels
+		for repository in libchannels.common.sourceslist:
+			if repository.disabled or repository.uri == "" or repository.type == "deb-src":
+				continue
+
+			# Generate InRelease filename from repository URI
+			release_base = repository.uri.replace("/","_").split("_")
+			# Remove empty (former) trailslashes
+			while release_base.count("") > 0:
+				release_base.remove("")
+			# Add other informations
+			release_base += ["dists", repository.dist]
+			# Remove protocol
+			release_base.pop(0)
+
+			# InRelease
+			InRelease = os.path.join("/var/lib/apt/lists", "_".join(release_base + ["InRelease"]))
+			# Release (fallback)
+			Release = os.path.join("/var/lib/apt/lists", "_".join(release_base[1:] + ["Release"]))
+
+			# Check existence
+			if os.path.exists(InRelease):
+				# InRelease found
+				release_file = open(InRelease)
+			elif os.path.exists(Release):
+				# Release found
+				release_file = open(Release)
+			else:
+				# Nothing found, continue
+				continue
+
+			# Obtain informations
+			origin = label = codename = None
+			for line in release_file:
+				line = line.strip().split(" ")
+				if line[0] == "Origin:":
+					origin = " ".join(line[1:])
+				elif line[0] == "Label:":
+					label = " ".join(line[1:])
+				elif line[0] == "Codename:":
+					codename = " ".join(line[1:])
+
+			# Search for the right channel
+			for channel, obj in cache.items():
+				obj.check(origin, label, codename, repository)
+
+			# Close
+			release_file.close()
+
+		for channel, obj in cache.items():
+			if obj.enabled:
+				self.channels[channel] = obj
+

semplice-base.provider

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+[provider]
+name = Semplice base system
+description = Semplice base system provider

semplice-current.channel

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+[channel]
+name = Semplice current channel
+description = Semplice main update channel
+depends = sid
+provides = semplice-base
+
+[main]
+default_mirror = http://archive.semplice-linux.org/semplice/
+origin = Semplice Project
+codename = unstable
+components = main contrib non-free
+
+[changes]
+default_mirror = http://archive.semplice-linux.org/semplice/
+origin = Semplice Project
+codename = changes-unstable
+components = main contrib non-free

semplice-devel.channel

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+[channel]
+name = Semplice development channel
+description = Semplice developer updates channel
+depends = semplice-current
+
+[main]
+default_mirror = http://archive.semplice-linux.org/semplice/
+origin = Semplice Project
+codename = devel
+components = main contrib non-free
+
+[changes]
+default_mirror = http://archive.semplice-linux.org/semplice/
+origin = Semplice Project
+codename = changes-devel-unstable
+components = main contrib non-free

semplice-jessie.channel

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+[channel]
+name = Semplice for Workstations 2015
+description = Channel for Semplice for Workstations 2015
+depends = jessie
+provides = semplice-base
+
+[main]
+default_mirror = http://archive.semplice-linux.org/semplice/
+origin = Semplice Project
+codename = jessie
+components = main contrib non-free
+
+[changes]
+default_mirror = http://archive.semplice-linux.org/semplice/
+origin = Semplice Project
+codename = changes-jessie
+components = main contrib non-free

sid.channel

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+[channel]
+name = Debian unstable channel
+description = Debian unstable "sid"
+provides = base
+
+[unstable]
+default_mirror = http://ftp.debian.org/debian/
+origin = Debian
+codename = sid
+components = main contrib non-free