chromium: Selectively link bundled libraries.

So far we just copied everything from source.* into the build directory
during the prePatch. This somewhat defeated the purpose of the source
splitup because it involved more I/O than just unpacking the entire
source tree.

Now, we're selectively *symlinking* the bundled sources into the build
directory. Even that isn't perfect because in the end we'd just
reference foreign derivations and we're done. But for now, this gets us
at least prepared for a massive reduction of compile time.

Unfortunately, gyp's behaviour when it comes to symlinks is quite
painful to come by, so we need to fix a few references to use absolute
paths.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

pkgs/applications/networking/browsers/chromium/browser.nix

@@ -117,14 +117,113 @@ in stdenv.mkDerivation rec {
     ++ optional cupsSupport libgcrypt
     ++ optional pulseSupport pulseaudio;
 
-  prePatch = ''
-    # XXX: Figure out a way how to split these properly.
-    #cpflags="-dsr --no-preserve=mode"
-    cpflags="-dr"
-    cp $cpflags "${source.main}"/* .
-    cp $cpflags "${source.bundled}" third_party
-    cp $cpflags "${source.sandbox}" sandbox
-    chmod -R u+w . # XXX!
+  prePatch = let
+    lntree = [ "cp" "-dsr" "--no-preserve=mode" ];
+    lntreeList = concatStringsSep ", " (map (arg: "'${arg}'") lntree);
+    lntreeSh = concatStringsSep " " lntree;
+  in ''
+    ${lntreeSh} "${source.main}"/* .
+    ${lntreeSh} "${source.sandbox}" sandbox
+
+    ensureDir third_party
+
+    # ONLY the dependencies we can't use from nixpkgs!
+    for bundled in ${concatStringsSep " " [
+      # This is in preparation of splitting up the bundled sources into separate
+      # derivations so we some day can tremendously reduce build time.
+      "adobe"
+      "angle"
+      "cacheinvalidation"
+      "cld_2"
+      "codesighs"
+      "cros_dbus_cplusplus"
+      "cros_system_api"
+      "flot"
+      "freetype2"
+      "hunspell"
+      "iccjpeg"
+      "jinja2"
+      "JSON"
+      "jstemplate"
+      "khronos"
+      "leveldatabase"
+      "libaddressinput"
+      "libjingle"
+      "libmtp"
+      "libphonenumber"
+      "libsrtp"
+      "libXNVCtrl"
+      "libyuv"
+      "lss"
+      "lzma_sdk"
+      "markupsafe"
+      "mesa"
+      "modp_b64"
+      "mt19937ar"
+      "mtpd"
+      "npapi"
+      "ots"
+      "ply"
+      "protobuf"
+      "qcms"
+      "readability"
+      "safe_browsing"
+      "sfntly"
+      "skia"
+      "smhasher"
+      "speech-dispatcher"
+      "tcmalloc"
+      "trace-viewer"
+      "undoview"
+      "usb_ids"
+      "usrsctp"
+      "WebKit"
+      "webrtc"
+      "widevine"
+      "x86inc"
+      "yasm"
+    ]}; do
+      echo -n "Linking ${source.bundled}/$bundled to third_party/..." >&2
+      ${lntreeSh} "${source.bundled}/$bundled" third_party/
+      echo " done." >&2
+    done
+
+    # Everything else is decided based on gypFlags.
+    PYTHONPATH="build/linux/unbundle:$PYTHONPATH" python <<PYTHON
+    import os, sys, subprocess
+    from replace_gyp_files import REPLACEMENTS
+    for flag, path in REPLACEMENTS.items():
+      if path.startswith("v8/"):
+        continue
+      if "-D{0}=1".format(flag) in os.environ.get('gypFlags'):
+        target = os.path.join("build/linux/unbundle", os.path.basename(path))
+        dest = path
+      else:
+        target_base = os.path.basename(os.path.dirname(path))
+        target = os.path.join("${source.bundled}", target_base)
+        dest = os.path.join("third_party", target_base)
+      try:
+        os.makedirs(os.path.dirname(dest))
+      except:
+        pass
+      sys.stderr.write("Linking {0} to {1}...".format(target, dest))
+      subprocess.check_call([${lntreeList}, os.path.abspath(target), dest])
+      sys.stderr.write(" done.\n")
+    PYTHON
+
+    # Auxilliary files needed in unbundled trees
+    ${lntreeSh} "${source.bundled}/libxml/chromium" third_party/libxml/chromium
+    ${lntreeSh} "${source.bundled}/zlib/google" third_party/zlib/google
+
+    find -iname '*.gyp*' \( -type f -o -type l \) \
+      -exec sed -i -e 's|<(DEPTH)|'"$(pwd)"'|g' {} +
+
+    # XXX: Really ugly workaround to fix improper symlink dereference.
+    sed -i -e '/args\['"'"'name'"'"'\] *= *parts\[0\]$/ {
+      s|$|.split("-bundled/WebKit/Source/", 1)[1] |;
+      s|$|if parts[0].startswith("../") else parts[0]|;
+    }' third_party/WebKit/Source/build/scripts/in_file.py \
+       third_party/WebKit/Source/build/scripts/make_event_factory.py
   '';
 
   postPatch = ''
@@ -170,7 +269,6 @@ in stdenv.mkDerivation rec {
   });
 
   configurePhase = ''
-    python build/linux/unbundle/replace_gyp_files.py ${gypFlags}
     python build/gyp_chromium -f ninja --depth "$(pwd)" ${gypFlags}
   '';