parallel_emerge: Fix builds when PORTAGE_BINHOST is unset

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 726 matching lines @@
 
       # 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"
 
-    def RemotePackageDatabase():
+    def RemotePackageDatabase(binhost_url):
       """Grab the latest binary package database from the prebuilt server.
 
       We need to know the modification times of the prebuilt packages so that we
       know when it is OK to use these packages and when we should rebuild them
       instead.
 
+      Args:
+        binhost_url: Base URL of remote packages (PORTAGE_BINHOST).
+
       Returns:
         A dict mapping package identifiers to modification times.
       """
-      url = self.emerge.settings["PORTAGE_BINHOST"] + "/Packages"
+
+      if not binhost_url:
+        return {}
+
+      url = binhost_url + "/Packages"
 
       prebuilt_pkgs = {}
       f = urllib2.urlopen(url)
       for line in f:
         if line.startswith("CPV: "):
           pkg = line.replace("CPV: ", "").rstrip()
         elif line.startswith("MTIME: "):
           prebuilt_pkgs[pkg] = int(line[:-1].replace("MTIME: ", ""))
       f.close()
 
@@ skipping 178 matching lines @@
         for db_pkg in final_db.match_pkgs(pkg):
           deps_map[str(db_pkg.cpv)]["mandatory_source"] = True
     else:
       for pkg in self.mandatory_source.copy():
         for db_pkg in final_db.match_pkgs(pkg):
           MergeChildren(str(db_pkg.cpv), "mandatory_source")
 
       cycles = FindCycles()
       if self.rebuild:
         local_pkgs = LocalPackageDatabase()
-        remote_pkgs = RemotePackageDatabase()
+        remote_pkgs = RemotePackageDatabase(emerge.settings["PORTAGE_BINHOST"])
         AutoRebuildDeps(local_pkgs, remote_pkgs, cycles)
 
     # We need to remove installed packages so that we can use the dependency
     # ordering of the install process to show us what cycles to crack. Once
     # we've done that, we also need to recalculate our list of cycles so that
     # we don't include the installed packages in our cycles.
     RemoveInstalledPackages()
     cycles = FindCycles()
     SanitizeTree(cycles)
     if deps_map:
@@ skipping 294 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()