Commit ae274d32 authored by Seblu's avatar Seblu

Initial commit

With a working PoC.
parents
# Maintainer: Sébastien Luttringer
pkgname=agetpkg-git
pkgver="$(git log --pretty=format:''|wc -l)"
pkgrel=1
pkgdesc='Archlinux Archive Get Package (Git version)'
arch=('any')
url='https://github.com/seblu/agetpkg'
license=('GPL2')
depends=('python' 'python-xdg')
package() {
cd "$startdir"
install -Dm755 agetpkg "$pkgdir/usr/bin/agetpkg"
}
# vim:set ts=2 sw=2 et:
#!/usr/bin/python3
# coding: utf-8
# agetpkg - Archive Get Package
# Copyright © 2015 Sébastien Luttringer
#
# 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
'''Archlinux Archive Get Package'''
from argparse import ArgumentParser
from collections import OrderedDict
from email.utils import parsedate
from logging import getLogger, error, debug, DEBUG
from lzma import open as xzopen
from os import stat, uname
from os.path import basename, exists, join
from pprint import pprint
from re import match, compile as recompile
from shutil import copyfileobj
from time import mktime, time
from urllib.request import urlopen, Request
from xdg.BaseDirectory import save_cache_path
# magics
NAME = "agetpkg"
VERSION = "0"
ARCHIVE_URL = "http://ala.seblu.net/packages/.all/"
INDEX_FILENAME = "index.0.xz"
PKG_EXT = ".pkg.tar.xz"
SIG_EXT = ".sig"
class Error(BaseException):
"""Error"""
ERR_USAGE = 1
ERR_FATAL = 2
ERR_ABORT = 3
ERR_UNKNOWN = 4
class Url(object):
"""Remote Ressource"""
HTTP_HEADERS = {
"User-Agent": "%s v%s" % (NAME, VERSION),
}
def __init__(self, url, timeout):
self.url = url
self.timeout = timeout
def __str__(self):
return self.url
@property
def exists(self):
try:
self.headers
return True
except Exception:
return False
@property
def size(self):
"""Return the remote file size"""
try:
return int(self.headers["Content-Length"])
except Exception as exp:
raise Error("Failed to get size of %s: %s" % (self.url, exp))
@property
def lastmod(self):
try:
return int(mktime(parsedate(self.headers["Last-Modified"])))
except Exception as exp:
raise Error("Failed to get last modification date of %s: %s" % (self.url, exp))
@property
def headers(self):
"""Return a dict with url headers"""
if not hasattr(self, "_headers"):
try:
debug("Request headers on URL: %s" % self.url)
url_req = Request(self.url, method="HEAD", headers=self.HTTP_HEADERS)
remote_fd = urlopen(url_req, timeout=self.timeout)
self._headers = dict(remote_fd.getheaders())
except Exception as exp:
raise Error("Failed to get headers at %s: %s" % (self, exp))
return getattr(self, "_headers")
def download(self, destination):
"""Download URL to destination"""
debug("Downloading from : %s" % self.url)
debug(" to : %s" % destination)
try:
url_req = Request(self.url, headers=self.HTTP_HEADERS)
remote_fd = urlopen(url_req, timeout=self.timeout)
local_fd = open(destination, "wb")
copyfileobj(remote_fd, local_fd)
except Exception as exp:
raise Error("Failed to download %s: %s" % (self, exp))
class Package(Url):
"""Abstract a multi versionned package"""
def __init__(self, url, timeout):
self.url = Url(url, timeout)
self.sigurl = Url(url + SIG_EXT, timeout)
self.timeout = timeout
self.filename = basename(url)
self.sigfilename = self.filename + SIG_EXT
# regex is not strict, but we are not validating something here
m = match("^([\w@._+-]+)-((?:(\d+):)?([^-]+)-([^-]+))-(\w+)", self.filename)
if m is None:
raise Error("Unable to parse package info from filename %s" % self.filename)
(self.name, self.full_version, self.epoch, self.version, self.release,
self.arch) = m.groups()
# no epoch means 0 (man PKGBUILD)
if self.epoch is None:
self.epoch = 0
def __str__(self):
return self.filename
def __getitem__(self, key):
try:
return getattr(self, key)
except AttributeError:
raise KeyError()
@property
def size(self):
"""Return package Content-Length (size in bytes)"""
return self.url.size
@property
def lastmod(self):
"""Return package Last-Modified date (in seconds since epoch)"""
return self.url.lastmod
def get(self, sign=True, force=False):
"""Download the package locally"""
if not force:
if exists(self.filename):
raise Error("Local file %s already exists" % self.filename)
if sign and exists(self.sigfilename):
raise Error("Local file %s already exists" % self.sigfilename)
self.url.download(self.filename)
if sign and self.sigurl.exists:
self.sigurl.download(self.sigfilename)
class Archive(object):
"""Abstract access to the package Archive"""
def __init__(self, url, timeout, update=1):
"""Init the Archive interface
url of the archive (flat style)
update = update the local index cache (0: never, 1: when needed, 2: always)
timeout = the socket timeout for network requests
"""
if url[-1] != "/":
raise Error("Archive URL must end with a /")
self.url = url
self.remote_index = Url(self.url + INDEX_FILENAME, timeout)
self.local_index = join(save_cache_path(NAME), INDEX_FILENAME)
self.timeout = timeout
if update > 0:
self.update_index(update == 2)
self._load_index()
def _load_index(self):
debug("Loading index from %s" % self.local_index)
fd = xzopen(self.local_index, "rb")
self._index = OrderedDict()
for line in fd.readlines():
key = line.decode().rstrip()
self._index[key] = Package("%s%s%s" % (self.url, key, PKG_EXT), self.timeout)
debug("Index loaded: %s packages" % len(self._index))
def update_index(self, force=False):
"""Update index remotely when needed"""
debug("Check remote index for upgrade")
if force:
return self.remote_index.download(self.local_index)
# get remote info
try:
remote_size = self.remote_index.size
remote_lastmod = self.remote_index.lastmod
except Exception as exp:
debug("Failed to get remote index size/lastmod: %s" % exp)
return self.remote_index.download(self.local_index)
# get local info
try:
local_st = stat(self.local_index)
except Exception as exp:
debug("Failed to get local stat: %s" % exp)
return self.remote_index.download(self.local_index)
# compare size
if remote_size != local_st.st_size:
debug("Size differ between remote and local index (%s vs %s)" % (remote_size, local_st.st_size))
return self.remote_index.download(self.local_index)
# compare date
elif remote_lastmod > local_st.st_mtime:
debug("Remote index is newer than local, updating it (%s vs %s)" % (remote_lastmod, local_st.st_mtime))
return self.remote_index.download(self.local_index)
debug("Remote and local indexes seems equal. No update.")
def search(self, name_pattern, version_pattern, arch_list=None):
"""Search for a package """
name_regex = recompile(name_pattern)
version_regex = recompile(version_pattern) if version_pattern is not None else None
res = list()
for pkg in self._index.values():
if name_regex.search(pkg.name):
# check against arch
if arch_list is not None and len(arch_list) > 0:
if pkg.arch not in arch_list:
continue
# check against version
if version_regex is not None:
if not version_regex.search(pkg.full_version):
continue
res += [pkg]
return res
def list_packages(packages, long=False):
"""display a list of packages on stdout"""
if long:
pattern = "%(name)s %(full_version)s %(arch)s %(size)s %(lastmod)s %(url)s"
else:
pattern = "%(name)s %(full_version)s %(arch)s"
for package in packages:
print(pattern % package)
def get_packages(packages):
"""retrieve packages"""
if len(packages) == 1:
packages[0].get()
else:
index = dict(enumerate(packages))
for i, pkg in index.items():
print(i, pkg)
n = int(input("Which number? "))
index[n].get()
def parse_argv():
'''Parse command line arguments'''
local_arch = uname().machine
p_main = ArgumentParser()
p_main.add_argument("--version", action="version",
version="%(prog)s version " + VERSION)
p_main.add_argument("--debug", action="store_true",
help="debug mode")
g_update = p_main.add_mutually_exclusive_group()
g_update.add_argument("-u", "--force-update",
action="store_const", dest="update", const=2, default=1,
help="force index update")
g_update.add_argument("-U", "--no-update",
action="store_const", dest="update", const=0,
help="disable index update")
p_main.add_argument("-l", "--list", action="store_const", dest="mode", const="list",
help="only list matching packages")
p_main.add_argument("-g", "--get", action="store_const", dest="mode", const="get",
help="get matching packages (default)")
p_main.add_argument("-a", "--arch", nargs="*", default=[local_arch, "any"],
help="filter by architectures (default is %s and any. empty means all)" % local_arch)
p_main.add_argument("-v", "--verbose", action="store_true",
help="display more information")
p_main.add_argument("--url", help="archive URL",
default=ARCHIVE_URL)
p_main.add_argument("-t", "--timeout", default=5, help="connection timeout (10s)")
p_main.add_argument("package",
help="regex to match a package name")
p_main.add_argument("version", nargs="?",
help="regex to match a package version")
return p_main.parse_args()
def main():
'''Program entry point'''
try:
# parse command line
args = parse_argv()
# set global debug mode
if args.debug:
getLogger().setLevel(DEBUG)
# init archive interface
archive = Archive(args.url, args.timeout, args.update)
# select target pacakges
packages = archive.search(args.package, args.version, args.arch)
if len(packages) == 0:
print("No match found.")
exit(0)
if args.mode == "list":
list_packages(packages, long=args.verbose)
else:
get_packages(packages)
except KeyboardInterrupt:
exit(Error.ERR_ABORT)
except Error as exp:
error(exp)
exit(Error.ERR_FATAL)
except Exception as exp:
error("Unknown error. Please report it with --debug.")
error(exp)
if getLogger().getEffectiveLevel() == DEBUG:
raise
exit(Error.ERR_UNKNOWN)
if __name__ == '__main__':
main()
# vim:set ts=4 sw=4 et ai:
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