Merged from trunk 8696:8729

   Merged from trunk 8696:8729

   | 8698    | Make doebuild() use EBUILD_EXIT_STATUS_FILE sanity checks    |
   | zmedico | for the extra misc-functions.sh preinst/postinst shell code. |

   | 8700    | Make the environment handling code detect errors and die if  |
   | zmedico | necessary.                                                   |

   | 8702    | Bug #200231 - Make dir_get_metadata() handle an exception    |
   | zmedico | thrown from dir_get_list() when there's a problem connection |
   |         | problem.                                                     |

   | 8704    | Fix config.pop() so that is will properly raise a KeyError.  |
   | zmedico |                                                              |

   | 8706    | Don't forget to unlink ${EBUILD_EXIT_STATUS_FILE} before     |
   | zmedico | each phase.                                                  |

   | 8708    | Bug #200229 - The gimp ebuild defines AA as a local          |
   | zmedico | variable. In order to accomodate this, create a              |
   |         | PORTAGE_MUTABLE_FILTERED_VARS list for variables that        |
   |         | portage sets but doesn't mark readonly. In order to prevent  |
   |         | changed values from causing unexpcted interference, they are |
   |         | filtered out of the environment when it is saved or loaded   |
   |         | (any mutations do not persist).                              |

   | 8710    | Fix logic wrt exit_status_check and elog_process in          |
   | zmedico | doebuild().                                                  |

   | 8712    | Remove a redundant os.EX_OK check that exit_status_check()   |
   | zmedico | already handles internally.                                  |

   | 8714    | portage upgrade or downgrade invalidates                     |
   | zmedico | EBUILD_EXIT_STATUS_FILE sanity checks since ebuild.sh        |
   |         | portage version may differ from the current instance that is |
   |         | running in python.                                           |

   | 8716    | Just use ${PN} instead of catpkgsplit().                     |
   | zmedico |                                                              |

   | 8718    | In the preprocess_ebuild_env() subshell, check for errors    |
   | zmedico | and return early when necessary.                             |

   | 8720    | Add a sanity check in dblink.treewalk() so that a broken     |
   | zmedico | ebuild that doesn't install any files will not be able to    |
   |         | replace a package in the same slot that really installs      |
   |         | files. This check can be bypassed by manually unmerging the  |
   |         | old package or by setting PORTAGE_PACKAGE_EMPTY_ABORT="0" in |
   |         | /etc/make.conf.                                              |

   | 8721    | Don't export PORTAGE_PACKAGE_EMPTY_ABORT to the ebuild       |
   | zmedico | environment.                                                 |

   | 8724    | Disable PORTAGE_PACKAGE_EMPTY_ABORT by default since the     |
   | zmedico | scrollkeeper-9999 upgrade will trigger a false positive.     |
   |         | Thanks to leio for reporting.                                |

   | 8726    | In chk_updated_cfg_files(), avoid scanning for config files  |
   | zmedico | for paths that aren't writable by the current user. This     |
   |         | prevents Permission denied errors from being triggered later |
   |         | when trying to scan subdirectories that are inaccessible.    |

   | 8729    | Bug #200652 - Skip ${T}/environment handling for             |
   | zmedico | pkg_nofetch().                                               |

svn path=/main/branches/prefix/; revision=8811