Automatically create a fallback setconfig, so emerge isn't crippled due to

misssing/corrupt/outdated sets.conf. This is especially important since
WorldSet has been renamed to WorldSelectedSet, and thus new and old sets.conf
files are incompatible. (trunk r14630)

svn path=/main/branches/2.1.7/; revision=14658

diff --git a/pym/_emerge/main.py b/pym/_emerge/main.py
index 10e605e568b9d609fb6b1928fb96a7687c4133b5..5007ecfefae13c73018cfdc66f0e5f3280376763 100644 (file)
--- a/pym/_emerge/main.py
+++ b/pym/_emerge/main.py
@@ -778,6 +778,55 @@ def ionice(settings):
                out.eerror("PORTAGE_IONICE_COMMAND returned %d" % (rval,))
                out.eerror("See the make.conf(5) man page for PORTAGE_IONICE_COMMAND usage instructions.")
 
+def setconfig_fallback(root_config):
+       from portage._sets.base import DummyPackageSet
+       from portage._sets.files import WorldSelectedSet
+       from portage._sets.profiles import PackagesSystemSet
+       setconfig = root_config.setconfig
+       setconfig.psets['world'] = DummyPackageSet(atoms=['@selected', '@system'])
+       setconfig.psets['selected'] = WorldSelectedSet(root_config.root)
+       setconfig.psets['system'] = \
+               PackagesSystemSet(root_config.settings.profiles)
+       root_config.sets = setconfig.getSets()
+
+def get_missing_sets(root_config):
+       # emerge requires existence of "world", "selected", and "system"
+       missing_sets = []
+
+       for s in ("selected", "system", "world",):
+               if s not in root_config.sets:
+                       missing_sets.append(s)
+
+       return missing_sets
+
+def missing_sets_warning(root_config, missing_sets):
+       if len(missing_sets) > 2:
+               missing_sets_str = ", ".join('"%s"' % s for s in missing_sets[:-1])
+               missing_sets_str += ', and "%s"' % missing_sets[-1]
+       elif len(missing_sets) == 2:
+               missing_sets_str = '"%s" and "%s"' % tuple(missing_sets)
+       else:
+               missing_sets_str = '"%s"' % missing_sets[-1]
+       msg = ["emerge: incomplete set configuration, " + \
+               "missing set(s): %s" % missing_sets_str]
+       if root_config.sets:
+               msg.append("        sets defined: %s" % ", ".join(root_config.sets))
+       msg.append("        This usually means that '%s'" % \
+               (os.path.join(portage.const.GLOBAL_CONFIG_PATH, "sets.conf"),))
+       msg.append("        is missing or corrupt.")
+       for line in msg:
+               writemsg_level(line + "\n", level=logging.ERROR, noiselevel=-1)
+
+def ensure_required_sets(trees):
+       warning_shown = False
+       for root_trees in trees.values():
+               missing_sets = get_missing_sets(root_trees["root_config"])
+               if missing_sets and not warning_shown:
+                       warning_shown = True
+                       missing_sets_warning(root_trees["root_config"], missing_sets)
+               if missing_sets:
+                       setconfig_fallback(root_trees["root_config"])
+
 def expand_set_arguments(myfiles, myaction, root_config):
 
        if myaction != "search":
@@ -996,6 +1045,8 @@ def emerge_main():
 
        root_config = trees[settings["ROOT"]]["root_config"]
 
+       ensure_required_sets(trees)
+
        # only expand sets for actions taking package arguments
        oldargs = myfiles[:]
        if myaction in ("clean", "config", "depclean", "info", "prune", "unmerge", None):