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#!/usr/bin/python
# -*- coding: UTF-8 -*-
# Copyright (C) 2008 Terence Simpson <tsimpson@ubuntu.com>
# License:
# 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.
#
# This script simulates «dget»'s behaviour for files hosted at
# launchpadlibrarian.net.
#
# Detailed description:
# This script attempts to download the source package in the same
# way as dget does, but from launchpadlibrarian.net, which doesn't
# store all the files in the same directory. It (the script) assumes
# that the files are stored in sequential directories on Launchpad
# Librarian and attempts to download and then unpack them.
# This is a Python rewrite of the original bash script
import cStringIO
import email.feedparser
import hashlib
import optparse
import os
import sys
import urllib2
try:
import GnuPGInterface
except ImportError:
print >> sys.stderr, ("Please install 'python-gnupginterface' in order to "
"use this utility.")
sys.exit(1)
from ubuntutools import subprocess
USAGE = u"""Usage: %prog [-d|(-v|-q)] <Launchpad URL>
This scripts simulates «dget»'s behaviour for files hosted at
launchpadlibrarian.net.
If you specify the -d option then it won't do anything, except download the
.dsc file, but just print the commands it would run otherwise.
Example:
%prog http://launchpadlibrarian.net/10348157/coreutils_5.97-5.4ubuntu1.dsc
"""
BASE_URL = "http://launchpadlibrarian.net/"
Debug = Verbose = Quiet = False
def unsign(data):
if data.splitlines()[0] != "-----BEGIN PGP SIGNED MESSAGE-----":
return data
oldstdout = sys.stdout
oldstderr = sys.stderr
sys.stdout = sys.__stdout__
sys.stderr = sys.__stderr__
gpg = GnuPGInterface.GnuPG()
proc = gpg.run(["--decrypt"], create_fhs=['stdin', 'stdout'])
proc.handles['stdin'].write(data)
proc.handles['stdin'].close()
plain = proc.handles['stdout'].read()
proc.handles['stdout'].close()
try:
proc.wait()
except:
pass
sys.stdout = oldstdout
sys.stderr = oldstderr
return plain
def get_entries(data):
parser = email.feedparser.FeedParser()
parser.feed(data)
return parser.close()
class DscParse(object):
"""Attempt to get the file list from the .dsc file"""
def __init__(self, data):
"""
__init__(data)
Given the contents of a .dsc, parse it and extract it's content
"""
self.entries = get_entries(unsign(data))
self.files = [x.strip().split() for x in
self.entries['Files'].splitlines()]
def verify_all(self):
"""
verify_all()
Verifies all the files, first checking the size, then the md5 sum.
Currently not used in this utility.
"""
assert self.files, "I have no files"
ret = []
for f in self.files:
ret.append(self.verify(f))
return ret
def verify(self, name):
"""
verify(name)
Verify the file 'name', first checking the size, then the md5 sum.
"""
assert self.files, "I have no files"
f = None
if isinstance(name, list):
f = name
else:
for i in self.files:
if i[2] == name:
f = i
if not f:
raise ValueError, "%s is not in the .dsc" % name
(md5sum, size, name) = tuple(f)
stat = os.stat(name)
if str(stat.st_size) != size:
return (False, name, "Expected a size of %s, got %s" % \
(size, stat.st_size))
return self.getsum(name, md5sum)
def getsum(self, name, md5sum=None):
"""
getsum(name[, md5sum])
Read the file 'name' (in 1MB chunks) and generate an md5 sum,
then compares that to the md5 sum in the .dsc file.
"""
chunk_size = 1073741824
fd = open(name, 'rb')
res = hashlib.md5()
if not md5sum:
assert self.files, "I have no files"
md5sum = [x[0] for x in self.files if x[2] == name][0]
data = fd.read(chunk_size)
while data:
res.update(data)
data = fd.read(chunk_size)
if res.hexdigest() != md5sum:
return (False, name, "Expected md5sum of %r, got %r" % \
(md5sum, res.hexdigest()))
return (True, name, None)
def is_native(self):
"""
is_native()
Returns True if this .dsc describes a native debian package;
else false.
"""
return len(self.files) == 1
# Access to fields in the .dsc via a dict-like interface
def __getitem__(self, item):
"""
x.__getitem(item) -> x[item]
"""
return self.entries.__getitem__(item)
def __contains__(self, item):
"""
x.__contains__(item) -> item in x
"""
return self.entries.__contains__(item)
def __getattr__(self, attr):
"""
x.__getattr__(attr) -> item.attr
"""
return getattr(self.entries, attr)
def error(ret, msg, *args):
"""Prints an error message, unless quiet is set, and exits with ret"""
if not Quiet:
print >> sys.stderr, msg % args
sys.exit(ret)
def debug(msg, *args):
"""If debugging is enabled, print a message"""
if Debug:
print >> sys.stderr, msg % args
def info(msg, *args):
"""If verbose is enabled, print a message"""
if Verbose:
print msg % tuple(args)
def status(msg, *args):
"""Prints a message, unless quiet is enabled"""
if not Quiet:
print msg % tuple(args)
def download(dscinfo, number, filename, verify=True):
"""download filename"""
ftype = filename.endswith(".diff.gz") and "diff.gz" or \
filename.endswith(".orig.tar.gz") and "orig.tar.gz" or \
filename.endswith(".dsc") and "dsc" or "tar.gz"
if verify and os.path.exists(filename):
info('Verifying "%s"', filename)
res = dscinfo.verify(filename)
if not res[0]:
error(104, "Verification of %s failed: %s", filename, res[2])
status("Getting %s", filename)
debug("%s%s/%s", BASE_URL, number, filename)
try:
fd = urllib2.urlopen("%s%s/%s" % (BASE_URL, number, filename))
outfd = open(filename, 'wb')
outfd.write(fd.read())
fd.close()
outfd.close()
except urllib2.HTTPError, err:
status("Failed to fetch «%s» file, aborting.", ftype)
error(106, "Error: (%d %s)", err.code, err.msg)
except urllib2.URLError, err:
status("Failed to fetch «%s» file, aborting.", ftype)
error(105, "Error: %s", err)
except IOError, err:
status('Could not create "%s"', filename)
error(107, "Error: %s", err)
def unpack(filename):
out = open('/dev/null', 'w')
err = open('/dev/null', 'w')
cmd = ["dpkg-source", "-x", filename]
ret = subprocess.call(cmd, stdout=out, stderr=err)
out.close()
err.close()
if ret:
status("Failed to unpack source, aborting.")
sys.exit(108)
def get_host(url):
return urllib2.splithost(urllib2.splittype(url)[1])[0]
def main():
global Debug, Verbose, Quiet
parser = optparse.OptionParser(usage=USAGE)
parser.add_option("-d", "--debug", action="store_true", dest="debug",
default=False, help="Enable debugging")
parser.add_option("-v", "--verbose", action="store_true", dest="verbose",
default=False, help="Enable verbose output")
parser.add_option("-q", "--quiet", action="store_true", dest="quiet",
default=False, help="Never print any output")
(options, args) = parser.parse_args()
if len(args) != 1:
parser.error("Missing URL")
Debug = options.debug
Verbose = options.verbose
Quiet = options.quiet
if Verbose and Quiet:
error(4, "Specifying both --verbose and --quiet does not make sense")
if Quiet:
sys.stderr = cStringIO.StringIO()
sys.stdout = cStringIO.StringIO()
url = args[0]
if url.startswith("https://"):
url = url.replace("https://", "http://", 1)
if not url.startswith("http://"):
url = "http://" + url
if get_host(url).startswith("www."):
url = url.replace("www.", "", 1)
if get_host(url) != get_host(BASE_URL):
error(1, "Error: This utility only works for files on %s.\n"
"Maybe you want to try dget?", BASE_URL)
(number, filename) = url.split('/')[3:]
if not filename.endswith('.dsc'):
error(2, "You have to provide the URL for the .dsc file.")
try:
number = int(number)
except:
error(3, "Bad URL format")
if os.path.exists(filename):
os.remove(filename)
download(None, number, filename, False)
try:
fd = open(filename)
dsc_data = fd.read()
fd.close()
except Exception:
status("Error: Please report this bug, providing the URL and attach"
" the following backtrace")
raise
dscinfo = DscParse(dsc_data)
# launchpadlibrarian.net seems to store in this order:
# For native packages:
# <number>/.changes
# <number>+1/.tar.gz
# <number>+2/.dsc
# For non-native packages:
# <number>/.changes
# <number>+1/.orig.tar.gz
# <number>+2/.diff.gz
# <number>+3/.dsc
##
# *Assuming* this does not change, we can figure out where the files are on
# launchpadlibrarian.net relative to the .dsc file we're given.
# Only one file listed in the .dsc means it's native package
if len(dscinfo.files) == 1:
download(dscinfo, number-1, dscinfo.files[0][-1]) # .tar.gz
else:
download(dscinfo, number-1, dscinfo.files[1][-1]) # .diff.gz
download(dscinfo, number-2, dscinfo.files[0][-1]) # .orig.tar.gz
status("Unpacking")
unpack(filename)
if __name__ == "__main__":
main()
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