Merge #2630: add and use fetchpatch

fetchpatch is fetchurl that determinizes the patch.
Some parts of generated patches change from time to time, e.g. see #1983 and
http://comments.gmane.org/gmane.linux.distributions.nixos/12815
Using fetchpatch should prevent the hash from changing.

Conflicts (auto-solved):
pkgs/development/libraries/haskell/gitit/default.nix

pkgs/applications/video/gnash/default.nix

···
-{ stdenv, fetchurl
+{ stdenv, fetchurl, fetchpatch
 , SDL, SDL_mixer, gstreamer, gst_plugins_base, gst_plugins_good
 , gst_ffmpeg, speex
 , libogg, libxml2, libjpeg, mesa, libpng, libungif, libtool
···
 assert stdenv ? glibc;
 
 let version = "0.8.10";
-    patch_CVE = fetchurl {
+    patch_CVE = fetchpatch {
       url = "http://git.savannah.gnu.org/cgit/gnash.git/patch/?id=bb4dc77eecb6ed1b967e3ecbce3dac6c5e6f1527";
-      sha256 = "1g7ymbq9vxi0mwcgs2dpyd2sf30gaam7blza0ywiwj32f5wk62v1";
+      sha256 = "0ghnki5w7xf3qwfl1x6vhijpd6q608niyxrvh0g8dw5xavkvallk";
       name = "CVE-2012-1175.patch";
     };
 in

pkgs/build-support/fetchpatch/default.nix

···
+# This function downloads and normalizes a patch/diff file.
+# This is primarily useful for dynamically generated patches,
+# such as GitHub's or cgit's, where the non-significant content parts
+# often change with updating of git or cgit.
+# stripLen acts as the -p parameter when applying a patch.
+
+{ fetchurl, patchutils }:
+{ stripLen ? 0, ... }@args:
+
+fetchurl ({
+  postFetch = ''
+    tmpfile="$TMPDIR/${args.sha256}"
+    "${patchutils}/bin/lsdiff" "$out" \
+      | sort -u | sed -e 's/[*?]/\\&/g' \
+      | xargs -I{} \
+        "${patchutils}/bin/filterdiff" \
+        --include={} \
+        --strip=${toString stripLen} \
+        --clean "$out" > "$tmpfile"
+    mv "$tmpfile" "$out"
+  '';
+} // args)

pkgs/development/libraries/haskell/HSH/default.nix

···
 { cabal, filepath, hslogger, MissingH, mtl, regexBase, regexCompat
-, regexPosix, fetchurl
+, regexPosix, fetchpatch
 }:
 
 cabal.mkDerivation (self: {
···
   buildDepends = [
     filepath hslogger MissingH mtl regexBase regexCompat regexPosix
   ];
-  patches = [ (fetchurl { url = "https://github.com/jgoerzen/hsh/pull/10.patch"; sha256 = "0fw2ihl4hlncggwf3v4d7aydm3rzgzpcxplfbwq7janysix4q950"; }) ];
+  patches = [ (fetchpatch { url = "https://github.com/jgoerzen/hsh/pull/10.patch"; sha256 = "0ddb3vf8ipf37zg4hkqh0frff1a7sv9ils3lw6qd3irpbwna1hdz"; }) ];
   meta = {
     homepage = "http://software.complete.org/hsh";
     description = "Library to mix shell scripting with Haskell programs";

pkgs/development/libraries/haskell/gitit/default.nix

···
 , filepath, filestore, ghcPaths, happstackServer, highlightingKate
 , hslogger, HStringTemplate, HTTP, json, mtl, network, pandoc
 , pandocTypes, parsec, random, recaptcha, safe, SHA, syb, tagsoup
-, text, time, url, utf8String, xhtml, xml, xssSanitize, zlib, fetchurl
+, text, time, url, utf8String, xhtml, xml, xssSanitize, zlib, fetchpatch
 }:
 
 cabal.mkDerivation (self: {
···
     zlib
   ];
   jailbreak = true;
-  patches = [ (fetchurl { url = "https://github.com/jgm/gitit/commit/48155008397bdaed4f97c5678d83c70d4bc3f0ff.patch";
-                          sha256 = "0xdg9frr8lany8ry6vj4vpskmhkpww8jswnb05pzl8a4xfqxh9gd";
-                        })
-            ];
+  patches = [ (fetchpatch {
+      url = "https://github.com/jgm/gitit/commit/48155008397bdaed4f97c5678d83c70d4bc3f0ff.patch";
+      sha256 = "16n372wrikwb3g4pb3zljxnp19in0828wp40diqgkplhlnwww6nw";
+    })
+  ];
   preConfigure = ''
     sed -i -e 's|network .*< 2.5|network|' gitit.cabal
   '';

pkgs/development/tools/haskell/BNFC/default.nix

···
-{ cabal, mtl, fetchurl, alex, happy }:
+{ cabal, mtl, fetchpatch, alex, happy }:
 
 cabal.mkDerivation (self: {
   pname = "BNFC";
···
   isExecutable = true;
   buildDepends = [ mtl ];
   buildTools = [ alex happy ];
-  patches = [ (fetchurl { url = "https://github.com/BNFC/bnfc/pull/3.patch"; sha256 = "103l04ylzswgxrmpv5zy6dd0jyr96z21mdkpgk1z4prvn8wjl624"; }) ];
+  patches = [ (fetchpatch { url = "https://github.com/BNFC/bnfc/pull/3.patch"; sha256 = "1i87crwva5m3v095lv3zxs38pr6nmly58krlr6sxpwnakpr0pxsp"; }) ];
   patchFlags = "-p2";
   preConfigure = "runhaskell Setup.lhs clean";
   meta = {

pkgs/development/tools/parsing/alex/3.0.5.nix

···
-{ cabal, fetchurl, perl, QuickCheck }:
+{ cabal, fetchpatch, perl, QuickCheck }:
 
 cabal.mkDerivation (self: {
   pname = "alex";
···
   isExecutable = true;
   buildDepends = [ QuickCheck ];
   buildTools = [ perl ];
-  patches = [ (fetchurl { url="https://github.com/simonmar/alex/pull/21.patch"; sha256="0apv3rk00gwkf5rqw3467bg6pnamr07zdksbp9khhzzi73k9aq4f"; }) ];
+  patches = [ (fetchpatch { url="http://github.com/simonmar/alex/pull/21.patch"; sha256="050psfwmjlxhyxiy65jsn3v6b9rnfzy8x5q9mmhzwbirqwi0zkfm"; }) ];
   meta = {
     homepage = "http://www.haskell.org/alex/";
     description = "Alex is a tool for generating lexical analysers in Haskell";

pkgs/servers/x11/xorg/overrides.nix

···
   };
 
   xf86videonv = attrs: attrs // {
-    patches = [( args.fetchurl {
+    patches = [( args.fetchpatch {
       url = http://cgit.freedesktop.org/xorg/driver/xf86-video-nv/patch/?id=fc78fe98222b0204b8a2872a529763d6fe5048da;
-      sha256 = "0ikbnz6048ygs1qahb6ylnxkyjhfjcqr2gm9bk95ca90v57j7i0f";
+      sha256 = "0i2ddgqwj6cfnk8f4r73kkq3cna7hfnz7k3xj3ifx5v8mfiva6gw";
     })];
   };
 

pkgs/tools/text/patchutils/default.nix

···
     sha256 = "0g5df00cj4nczrmr4k791l7la0sq2wnf8rn981fsrz1f3d2yix4i";
   };
 
-  meta = {
+  patches = [ ./drop-comments.patch ]; # we would get into a cycle when using fetchpatch on this one
+
+  meta = with stdenv.lib; {
     description = "Tools to manipulate patch files";
     homepage = http://cyberelk.net/tim/software/patchutils;
-    license = "GPLv2";
+    license = licenses.gpl2Plus;
+    platforms = platforms.all;
     executables = [ "combinediff" "dehtmldiff" "editdiff" "espdiff"
       "filterdiff" "fixcvsdiff" "flipdiff" "grepdiff" "interdiff" "lsdiff"
       "recountdiff" "rediff" "splitdiff" "unwrapdiff" ];

pkgs/tools/text/patchutils/drop-comments.patch

···
+From 58987954647f51dc42fb13b7759923c6170dd905 Mon Sep 17 00:00:00 2001
+From: Tim Waugh <[e-mail]>
+Date: Fri, 9 May 2014 16:23:27 +0100
+Subject: Make --clean drop comments after '@@' lines as well (trac #29).
+
+
+diff --git a/Makefile.am b/Makefile.am
+index 99ad2a3..f3c6dbc 100644
+--- a/Makefile.am
++++ b/Makefile.am
+@@ -198,6 +198,7 @@ TESTS = tests/newline1/run-test \
+ 	tests/convert1/run-test \
+ 	tests/convert2/run-test \
+ 	tests/clean1/run-test \
++	tests/clean2/run-test \
+ 	tests/stdin/run-test
+ 
+ # These ones don't work yet.
+diff --git a/src/filterdiff.c b/src/filterdiff.c
+index 383e72b..6ca2316 100644
+--- a/src/filterdiff.c
++++ b/src/filterdiff.c
+@@ -2,7 +2,7 @@
+  * filterdiff - extract (or exclude) a diff from a diff file
+  * lsdiff - show which files are modified by a patch
+  * grepdiff - show files modified by a patch containing a regexp
+- * Copyright (C) 2001, 2002, 2003, 2004, 2008, 2009, 2011 Tim Waugh <[e-mail]>
++ * Copyright (C) 2001, 2002, 2003, 2004, 2008, 2009, 2011, 2013, 2014 Tim Waugh <[e-mail]>
+  *
+  * 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
+@@ -408,7 +408,8 @@ do_unified (FILE *f, char *header[2], int match, char **line,
+ 							 " Hunk #%lu, %s",
+ 							 hunknum, bestname);
+ 
+-					fputs (trailing, output_to);
++					fputs (clean_comments ? "\n" : trailing,
++					       output_to);
+ 					break;
+ 				case Before:
+ 					// Note the initial line number
+diff --git a/tests/clean2/run-test b/tests/clean2/run-test
+new file mode 100755
+index 0000000..42320df
+--- /dev/null
++++ b/tests/clean2/run-test
+@@ -0,0 +1,34 @@
++#!/bin/sh
++
++# This is a filterdiff(1) testcase.
++# Test: Make sure --clean removes hunk-level comments.
++
++
++. ${top_srcdir-.}/tests/common.sh
++
++cat << EOF > diff
++non-diff line
++--- a/file1
+++++ b/file1
++@@ -0,0 +1 @@ this is a hunk-level comment
+++a
++EOF
++
++${FILTERDIFF} --clean diff 2>errors >filtered || exit 1
++[ -s errors ] && exit 1
++
++cat << EOF | cmp - filtered || exit 1
++--- a/file1
+++++ b/file1
++@@ -0,0 +1 @@
+++a
++EOF
++
++${FILTERDIFF} --clean -x file1 diff 2>errors >filtered || exit 1
++[ -s errors ] && exit 1
++cat << EOF | cmp - filtered || exit 1
++--- a/file1
+++++ b/file1
++@@ -0,0 +1 @@
+++a
++EOF
+-- 
+cgit v0.10.1
+

pkgs/top-level/all-packages.nix

···
 
   fetchmtn = callPackage ../build-support/fetchmtn (config.fetchmtn or {});
 
+  fetchpatch = callPackage ../build-support/fetchpatch { };
+
   fetchsvn = import ../build-support/fetchsvn {
     inherit stdenv subversion openssh;
     sshSupport = true;
···
   xinetd = callPackage ../servers/xinetd { };
 
   xorg = recurseIntoAttrs (import ../servers/x11/xorg/default.nix {
-    inherit fetchurl fetchgit stdenv pkgconfig intltool freetype fontconfig
+    inherit fetchurl fetchgit fetchpatch stdenv pkgconfig intltool freetype fontconfig
       libxslt expat libdrm libpng zlib perl mesa_drivers
       dbus libuuid openssl gperf m4
       autoconf automake libtool xmlto asciidoc udev flex bison python mtdev pixman;