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#!/usr/bin/env python3
# Note that rrdtool can also generate .diff files and
# is usually more efficient at it than this script
#############################################################################
# generates partial package updates list as reprepro hook
# (to be used by apt-get >= 0.6.44, apt-qupdate or things compatible with that)
# changes Copyright 2005 Bernhard R. Link <brlink@debian.org>
# as this is used as hook, it does not need any parsing of
# Configuration or Handling of architectures and components.
# Also reprepro will present old and new file, so it does not
# need to store a permanent copy of the last version.
# This needs either python3-apt installed or you have to change
# it to use another sha1 calculation method.
# HOW TO USE:
# - install python3-apt
# - make sure your paths contain no ' characters.
# - be aware this is still quite experimental and might not
# report some errors properly
# - uncompress this file if it is compressed
# - copy this file to your conf/ directory as "pdiff"
# - make it executable
# - add something like the following to the every distribution
# in conf/distributions you want to have diffs for:
#
# DscIndices: Sources Release . .gz pdiff
# DebIndices: Packages Release . .gz pdiff
#
# The first line is for source indices, the second for binary indices.
# Make sure uncompressed index files are generated (the single dot in those
# lines), as this version only diffs the uncompressed files.
# This file is a heavily modified version of apt-qupdate's tiffany,
# (downloaded from http://ftp-master.debian.org/~ajt/tiffani/tiffany
# 2005-02-20)which says:
#--------------------------------------------------------------------
# idea and basic implementation by Anthony, some changes by Andreas
# parts are stolen from ziyi
#
# Copyright (C) 2004-5 Anthony Towns <aj@azure.humbug.org.au>
# Copyright (C) 2004-5 Andreas Barth <aba@not.so.argh.org>
#--------------------------------------------------------------------
# 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
#############################################################################
import sys, os, time
import apt_pkg
################################################################################
def usage (exit_code=0):
print("""Usage: pdiff.example directory newfile oldfile mode 3>releaselog
Write out ed-style diffs to Packages/Source lists
This file is intended to be called by reprepro as hook
given to DebIndices, UDebIndices or DscIndices.
""")
sys.exit(exit_code);
def tryunlink(file):
try:
os.unlink(file)
except OSError:
print("warning: removing of %s denied" % (file))
class Updates:
def __init__(self, readpath = None):
self.can_path = None
self.history = {}
self.max = 14
self.readpath = readpath
self.filesizesha1 = None
if readpath:
try:
f = open(readpath + "/Index")
x = f.readline()
def read_hashs(ind, f, self, x=x):
while 1:
x = f.readline()
if not x or x[0] != " ": break
l = x.split()
if l[2] not in self.history:
self.history[l[2]] = [None,None]
self.history[l[2]][ind] = (l[0], int(l[1]))
return x
while x:
l = x.split()
if len(l) == 0:
x = f.readline()
continue
if l[0] == "SHA1-History:":
x = read_hashs(0,f,self)
continue
if l[0] == "SHA1-Patches:":
x = read_hashs(1,f,self)
continue
if l[0] == "Canonical-Name:" or l[0]=="Canonical-Path:":
self.can_path = l[1]
if l[0] == "SHA1-Current:" and len(l) == 3:
self.filesizesha1 = (l[1], int(l[2]))
x = f.readline()
except IOError:
0
def dump(self, out=sys.stdout):
if self.can_path:
out.write("Canonical-Path: %s\n" % (self.can_path))
if self.filesizesha1:
out.write("SHA1-Current: %s %7d\n" % (self.filesizesha1))
hs = self.history
l = list(self.history.keys())
l.sort()
cnt = len(l)
if cnt > self.max:
for h in l[:cnt-self.max]:
tryunlink("%s/%s.gz" % (self.readpath, h))
del hs[h]
l = l[cnt-self.max:]
out.write("SHA1-History:\n")
for h in l:
out.write(" %s %7d %s\n" % (hs[h][0][0], hs[h][0][1], h))
out.write("SHA1-Patches:\n")
for h in l:
out.write(" %s %7d %s\n" % (hs[h][1][0], hs[h][1][1], h))
def sizesha1(f):
size = os.fstat(f.fileno())[6]
f.seek(0)
sha1sum = apt_pkg.sha1sum(f)
return (sha1sum, size)
def getsizesha1(name):
f = open(name, "r")
r = sizesha1(f)
f.close()
return r
def main():
if len(sys.argv) != 5:
usage(1)
directory = sys.argv[1]
newrelfile = sys.argv[2]
oldrelfile = sys.argv[3]
mode = sys.argv[4]
# this is only needed with reprepro <= 0.7
if oldrelfile.endswith(".gz"):
sys.exit(0);
oldfile = "%s/%s" % (directory,oldrelfile)
newfile= "%s/%s" % (directory,newrelfile)
outdir = oldfile + ".diff"
if mode == "old":
# Nothing to do...
if os.path.isfile(outdir + "/Index"):
os.write(3,(oldrelfile + ".diff/Index").encode("utf-8"))
sys.exit(0);
if mode == "new":
# TODO: delete possible existing Index and patch files?
sys.exit(0);
print("making diffs between %s and %s: " % (oldfile, newfile))
o = os.popen("date +%Y-%m-%d-%H%M.%S")
patchname = o.readline()[:-1]
o.close()
difffile = "%s/%s" % (outdir, patchname)
upd = Updates(outdir)
oldsizesha1 = getsizesha1(oldfile)
# should probably early exit if either of these checks fail
# alternatively (optionally?) could just trim the patch history
if upd.filesizesha1:
if upd.filesizesha1 != oldsizesha1:
print("old file seems to have changed! %s %s => %s %s" % (upd.filesizesha1 + oldsizesha1))
sys.exit(1);
newsizesha1 = getsizesha1(newfile)
if newsizesha1 == oldsizesha1:
print("file unchanged, not generating diff")
if os.path.isfile(outdir + "/Index"):
os.write(3,(oldrelfile + ".diff/Index\n").encode("utf-8"))
else:
if not os.path.isdir(outdir): os.mkdir(outdir)
print("generating diff")
while os.path.isfile(difffile + ".gz"):
print("This was too fast, diffile already there, waiting a bit...")
time.sleep(2)
o = os.popen("date +%Y-%m-%d-%H%M.%S")
patchname = o.readline()[:-1]
o.close()
difffile = "%s/%s" % (outdir, patchname)
# TODO make this without shell...
os.system("diff --ed '%s' '%s' > '%s'" %
(oldfile,newfile, difffile))
difsizesha1 = getsizesha1(difffile)
# TODO dito
os.system("gzip -9 '%s'" %difffile)
upd.history[patchname] = (oldsizesha1, difsizesha1)
upd.filesizesha1 = newsizesha1
f = open(outdir + "/Index.new", "w")
upd.dump(f)
f.close()
# Specifying the index should be enough, it contains checksums for the diffs
os.write(3,(oldrelfile + ".diff/Index.new\n").encode("utf-8"))
################################################################################
if __name__ == '__main__':
main()
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