Blacklist icedtea and o3d from automatic rebuilds.

parallel_emerge

 #!/usr/bin/python2.6
 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Program to run emerge in parallel, for significant speedup.
 
 Usage:
  ./parallel_emerge [--board=BOARD] [--workon=PKGS] [--no-workon-deps]
                    [emerge args] package"
@@ skipping 539 matching lines @@
     # It's useful to know what packages will actually end up on the
     # system at some point. Packages in final_db are either already
     # installed, or will be installed by the time we're done.
     final_db = emerge.depgraph._dynamic_config.mydbapi[root]
 
     # final_pkgs is a set of the packages we found in the final_db. These
     # packages are either already installed, or will be installed by the time
     # we're done. It's populated in BuildFinalPackageSet()
     final_pkgs = set()
 
+    # These packages take a really long time to build, so, for expediency, we
+    # are blacklisting them from automatic rebuilds. Instead, these packages
+    # will only be rebuilt when they are explicitly rev'd.
+    rebuild_blacklist = set()
+    for pkg in ("media-plugins/o3d", "dev-java/icedtea"):
+      for match in final_db.match_pkgs(pkg):
+        rebuild_blacklist.add(str(match.cpv))
+
     # deps_map is the actual dependency graph.
     #
     # Each package specifies a "needs" list and a "provides" list. The "needs"
     # list indicates which packages we depend on. The "provides" list
     # indicates the reverse dependencies -- what packages need us.
     #
     # We also provide some other information in the dependency graph:
     #  - action: What we're planning on doing with this package. Generally,
     #            "merge", "nomerge", or "uninstall"
     #  - mandatory_source:
@@ skipping 169 matching lines @@
           if dep.find(needed) != -1:
             needed_pkg = dep
         if bad_pkg and needed_pkg:
           deps_map[needed_pkg]["provides"].add(bad_pkg)
           deps_map[bad_pkg]["needs"][needed_pkg] = "secret"
 
     def MergeChildren(pkg, merge_type):
       """Merge this package and all packages it provides."""
 
       this_pkg = deps_map[pkg]
-      if this_pkg[merge_type] or pkg not in final_pkgs:
-        return set()
+      if (this_pkg[merge_type] or pkg not in final_pkgs or
+          pkg in rebuild_blacklist):
+        return
 
       # Mark this package as non-optional
       deps_info[pkg]["optional"] = False
       this_pkg[merge_type] = True
       for w in this_pkg["provides"]:
         MergeChildren(w, merge_type)
 
       if this_pkg["action"] == "nomerge":
         this_pkg["action"] = "merge"
 
@@ skipping 521 matching lines @@
       for db_pkg in final_db.match_pkgs(pkg):
         print "Adding %s to world" % db_pkg.cp
         new_world_pkgs.append(db_pkg.cp)
     if new_world_pkgs:
       world_set.update(new_world_pkgs)
 
   print "Done"
 
 if __name__ == "__main__":
   main()