Blame SOURCES/BZ-1194915-add-logging-for-bad-notice-dupes.patch

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diff -up yum-3.4.3/yum/update_md.py.org yum-3.4.3/yum/update_md.py
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--- yum-3.4.3/yum/update_md.py.org	2017-01-24 18:55:03.529842775 +0100
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+++ yum-3.4.3/yum/update_md.py	2017-01-24 18:55:57.213511475 +0100
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@@ -58,7 +58,7 @@ class UpdateNotice(object):
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     A single update notice (for instance, a security fix).
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     """
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-    def __init__(self, elem=None):
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+    def __init__(self, elem=None, repoid=None, vlogger=None):
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         self._md = {
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             'from'             : '',
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             'type'             : '',
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@@ -83,6 +83,9 @@ class UpdateNotice(object):
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         if elem:
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             self._parse(elem)
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+        self._repoid = repoid
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+        self._vlogger = vlogger
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+
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     def __getitem__(self, item):
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         """ Allows scriptable metadata access (ie: un['update_id']). """
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         if type(item) is int:
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@@ -103,6 +106,24 @@ class UpdateNotice(object):
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         #  Tests to see if it's "the same data", which means that the
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         # packages can be different (see add_notice).
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+        def _rid(un):
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+            if hasattr(un, '_repoid') and un._repoid is not None:
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+                return un._repoid
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+            else:
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+                return '<unknown>'
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+
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+        def _log_failure(data):
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+            """Log the mismatched data similarly to conflict markers in git."""
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+            if self._vlogger is None:
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+                return
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+            msg = _('Duplicate of %s differs in some fields:\n')
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+            msg %= other._md['update_id']
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+            msg += '<<<<<<< %s:%s\n' % (_rid(other), data)
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+            msg += '%r\n=======\n%r\n' % (other._md[data], self._md[data])
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+            msg += '>>>>>>> %s:%s' % (_rid(self), data)
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+            # --verbose mode enables this
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+            self._vlogger.log(logginglevels.DEBUG_3, msg)
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+
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         if not other or not hasattr(other, '_md'):
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             return False
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@@ -113,6 +134,7 @@ class UpdateNotice(object):
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             if data == 'status': # FIXME: See below...
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                 continue
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             if self._md[data] != other._md[data]:
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+                _log_failure(data)
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                 return False
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         # FIXME: Massive hack, Fedora is really broken and gives status=stable
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         # and status=testing for updateinfo notices, just depending on which
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@@ -120,8 +142,10 @@ class UpdateNotice(object):
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         data = 'status'
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         if self._md[data] != other._md[data]:
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             if self._md[data]  not in ('stable', 'testing'):
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+                _log_failure(data)
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                 return False
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             if other._md[data] not in ('stable', 'testing'):
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+                _log_failure(data)
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                 return False
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             # They are both really "stable" ...
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             self._md[data]  = 'stable'
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@@ -574,7 +598,7 @@ class UpdateMetadata(object):
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         for event, elem in safe_iterparse(infile, logger=self._logger):
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             if elem.tag == 'update':
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                 try:
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-                    un = UpdateNotice(elem)
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+                    un = UpdateNotice(elem, repoid, self._vlogger)
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                 except UpdateNoticeException, e:
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                     msg = _("An update notice%s is broken, skipping.") % _rid(repoid)
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                     if self._vlogger:
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@@ -587,6 +611,8 @@ class UpdateMetadata(object):
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                     msg = _("Update notice %s%s is broken, or a bad duplicate, skipping.") % (un['update_id'], _rid(repoid))
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                     if not have_dup:
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                         msg += _('\nYou should report this problem to the owner of the %srepository.') % _rid(repoid, "%s ")
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+                        msg += _('\nIf you are the owner, consider re-running the same command with --verbose to see the '
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+                                 'exact data that caused the conflict.')
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                     have_dup = True
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                     if self._vlogger:
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                         self._vlogger.warn("%s", msg)