Add some --debug output for backtracking. Also, remove unused imports.

svn path=/main/trunk/; revision=14122

diff --git a/pym/_emerge/depgraph.py b/pym/_emerge/depgraph.py
index fb6c51084a212a0599456cc67012a53f3368ef25..ebb3bfda4e27ef141590e7ef04548efa3b7eba36 100644 (file)
--- a/pym/_emerge/depgraph.py
+++ b/pym/_emerge/depgraph.py
@@ -3,6 +3,7 @@
 # $Id$
 
 import gc
+import logging
 import re
 import sys
 import textwrap
@@ -17,6 +18,7 @@ bad = create_color_func("BAD")
 from portage.sets import SETPREFIX
 from portage.sets.base import InternalPackageSet
 from portage.util import cmp_sort_key, writemsg, writemsg_stdout
+from portage.util import writemsg_level
 
 from _emerge.AtomArg import AtomArg
 from _emerge.Blocker import Blocker
@@ -24,7 +26,6 @@ from _emerge.BlockerCache import BlockerCache
 from _emerge.BlockerDepPriority import BlockerDepPriority
 from _emerge.changelog import calc_changelog
 from _emerge.countdown import countdown
-from _emerge.create_depgraph_params import create_depgraph_params
 from _emerge.create_world_atom import create_world_atom
 from _emerge.Dependency import Dependency
 from _emerge.DependencyArg import DependencyArg
@@ -714,6 +715,18 @@ class depgraph(object):
                                                        dep.parent, {})["missing dependency"] = \
                                                                set([(dep.parent, dep.root, dep.atom)])
                                                self._dynamic_config._need_restart = True
+                                               if "--debug" in self._frozen_config.myopts:
+                                                       msg = []
+                                                       msg.append("")
+                                                       msg.append("")
+                                                       msg.append("backtracking due to unsatisfied dep:")
+                                                       msg.append("    parent: %s" % dep.parent)
+                                                       msg.append("  priority: %s" % dep.priority)
+                                                       msg.append("      root: %s" % dep.root)
+                                                       msg.append("      atom: %s" % dep.atom)
+                                                       msg.append("")
+                                                       writemsg_level("".join("%s\n" % l for l in msg),
+                                                               noiselevel=-1, level=logging.DEBUG)
 
                        return 0
                # In some cases, dep_check will return deps that shouldn't
@@ -868,6 +881,19 @@ class depgraph(object):
                                                self._dynamic_config._runtime_pkg_mask.setdefault(
                                                        existing_node, {})["slot conflict"] = parent_atoms
                                                self._dynamic_config._need_restart = True
+                                               if "--debug" in self._frozen_config.myopts:
+                                                       msg = []
+                                                       msg.append("")
+                                                       msg.append("")
+                                                       msg.append("backtracking due to slot conflict:")
+                                                       msg.append("   package: %s" % existing_node)
+                                                       msg.append("      slot: %s" % existing_node.slot_atom)
+                                                       msg.append("   parents: %s" % \
+                                                               [(str(parent), atom) \
+                                                               for parent, atom in parent_atoms])
+                                                       msg.append("")
+                                                       writemsg_level("".join("%s\n" % l for l in msg),
+                                                               noiselevel=-1, level=logging.DEBUG)
                                                return 0
 
                                        # A slot collision has occurred.  Sometimes this coincides
@@ -3866,8 +3892,6 @@ class depgraph(object):
                                depth >= mylist[i+1][1]:
                                        del mylist[i]
 
-               from portage import flatten
-               from portage.dep import use_reduce, paren_reduce
                # files to fetch list - avoids counting a same file twice
                # in size display (verbose mode)
                myfetchlist=[]
@@ -4966,6 +4990,10 @@ def backtrack_depgraph(settings, trees, myopts, myparams,
                                runtime_pkg_mask = mydepgraph.get_runtime_pkg_mask()
                                backtracked += 1
                        elif backtracked and allow_backtracking:
+                               if "--debug" in myopts:
+                                       writemsg_level(
+                                               "\n\nbacktracking aborted after %s tries\n\n" % \
+                                               backtracked, noiselevel=-1, level=logging.DEBUG)
                                # Backtracking failed, so disable it and do
                                # a plain dep calculation + error message.
                                allow_backtracking = False