--- a/mercurial/commands.py	Mon Sep 01 10:57:27 2014 -0300
+++ b/mercurial/commands.py	Mon Sep 01 23:43:33 2014 +0200
@@ -1498,7 +1498,7 @@
 
     See :hg:`help config` for more information about config files.
 
-    Returns 0 on success.
+    Returns 0 on success, 1 if NAME does not exist.
 
     """
 
@@ -1551,6 +1551,7 @@
         items = [v for v in values if '.' in v]
         if len(items) > 1 or items and sections:
             raise util.Abort(_('only one config item permitted'))
+    matched = False
     for section, name, value in ui.walkconfig(untrusted=untrusted):
         value = str(value).replace('\n', '\\n')
         sectname = section + '.' + name
@@ -1560,14 +1561,20 @@
                     ui.debug('%s: ' %
                              ui.configsource(section, name, untrusted))
                     ui.write('%s=%s\n' % (sectname, value))
+                    matched = True
                 elif v == sectname:
                     ui.debug('%s: ' %
                              ui.configsource(section, name, untrusted))
                     ui.write(value, '\n')
+                    matched = True
         else:
             ui.debug('%s: ' %
                      ui.configsource(section, name, untrusted))
             ui.write('%s=%s\n' % (sectname, value))
+            matched = True
+    if matched:
+        return 0
+    return 1
 
 @command('copy|cp',
     [('A', 'after', None, _('record a copy that has already occurred')),

--- a/mercurial/help.py	Mon Sep 01 10:57:27 2014 -0300
+++ b/mercurial/help.py	Mon Sep 01 23:43:33 2014 +0200
@@ -86,9 +86,10 @@
                'extensioncommands': [],
                }
     for names, header, doc in helptable:
+        # Old extensions may use a str as doc.
         if (sum(map(lowercontains, names))
             or lowercontains(header)
-            or lowercontains(doc())):
+            or (callable(doc) and lowercontains(doc()))):
             results['topics'].append((names[0], header))
     import commands # avoid cycle
     for cmd, entry in commands.table.iteritems():

--- a/mercurial/repoview.py	Mon Sep 01 10:57:27 2014 -0300
+++ b/mercurial/repoview.py	Mon Sep 01 23:43:33 2014 +0200
@@ -189,7 +189,7 @@
             # without change in the cachekey.
             oldfilter = cl.filteredrevs
             try:
-                cl.filterrevs = ()  # disable filtering for tip
+                cl.filteredrevs = ()  # disable filtering for tip
                 curkey = (len(cl), cl.tip(), hash(oldfilter))
             finally:
                 cl.filteredrevs = oldfilter

--- a/tests/test-config.t	Mon Sep 01 10:57:27 2014 -0300
+++ b/tests/test-config.t	Mon Sep 01 23:43:33 2014 +0200
@@ -42,3 +42,8 @@
 
   $ hg showconfig unsettest
   unsettest.set-after-unset=should be set (.hg/hgrc)
+
+Test exit code when no config matches
+
+  $ hg config Section.idontexist
+  [1]

--- a/tests/test-lfconvert.t	Mon Sep 01 10:57:27 2014 -0300
+++ b/tests/test-lfconvert.t	Mon Sep 01 23:43:33 2014 +0200
@@ -326,6 +326,7 @@
   verified existence of 6 revisions of 4 largefiles
   [1]
   $ hg -R largefiles-repo-hg showconfig paths
+  [1]
 
 
 Avoid a traceback if a largefile isn't available (issue3519)