--- a/hgext/convert/__init__.py	Fri Nov 24 21:51:41 2017 -0500
+++ b/hgext/convert/__init__.py	Tue Nov 28 23:20:08 2017 -0500
@@ -28,103 +28,6 @@
 # leave the attribute unspecified.
 testedwith = 'ships-with-hg-core'
 
-configtable = {}
-configitem = registrar.configitem(configtable)
-
-configitem('convert', 'cvsps.cache',
-    default=True,
-)
-configitem('convert', 'cvsps.fuzz',
-    default=60,
-)
-configitem('convert', 'cvsps.logencoding',
-    default=None,
-)
-configitem('convert', 'cvsps.mergefrom',
-    default=None,
-)
-configitem('convert', 'cvsps.mergeto',
-    default=None,
-)
-configitem('convert', 'git.committeractions',
-    default=lambda: ['messagedifferent'],
-)
-configitem('convert', 'git.extrakeys',
-    default=list,
-)
-configitem('convert', 'git.findcopiesharder',
-    default=False,
-)
-configitem('convert', 'git.remoteprefix',
-    default='remote',
-)
-configitem('convert', 'git.renamelimit',
-    default=400,
-)
-configitem('convert', 'git.saverev',
-    default=True,
-)
-configitem('convert', 'git.similarity',
-    default=50,
-)
-configitem('convert', 'git.skipsubmodules',
-    default=False,
-)
-configitem('convert', 'hg.clonebranches',
-    default=False,
-)
-configitem('convert', 'hg.ignoreerrors',
-    default=False,
-)
-configitem('convert', 'hg.revs',
-    default=None,
-)
-configitem('convert', 'hg.saverev',
-    default=False,
-)
-configitem('convert', 'hg.sourcename',
-    default=None,
-)
-configitem('convert', 'hg.startrev',
-    default=None,
-)
-configitem('convert', 'hg.tagsbranch',
-    default='default',
-)
-configitem('convert', 'hg.usebranchnames',
-    default=True,
-)
-configitem('convert', 'ignoreancestorcheck',
-    default=False,
-)
-configitem('convert', 'localtimezone',
-    default=False,
-)
-configitem('convert', 'p4.encoding',
-    default=lambda: convcmd.orig_encoding,
-)
-configitem('convert', 'p4.startrev',
-    default=0,
-)
-configitem('convert', 'skiptags',
-    default=False,
-)
-configitem('convert', 'svn.debugsvnlog',
-    default=True,
-)
-configitem('convert', 'svn.trunk',
-    default=None,
-)
-configitem('convert', 'svn.tags',
-    default=None,
-)
-configitem('convert', 'svn.branches',
-    default=None,
-)
-configitem('convert', 'svn.startrev',
-    default=0,
-)
-
 # Commands definition was moved elsewhere to ease demandload job.
 
 @command('convert',

--- a/hgext/convert/p4.py	Fri Nov 24 21:51:41 2017 -0500
+++ b/hgext/convert/p4.py	Tue Nov 28 23:20:08 2017 -0500
@@ -44,6 +44,9 @@
 
 class p4_source(common.converter_source):
     def __init__(self, ui, path, revs=None):
+        # avoid import cycle
+        from . import convcmd
+
         super(p4_source, self).__init__(ui, path, revs=revs)
 
         if "/" in path and not path.startswith('//'):
@@ -53,7 +56,8 @@
         common.checktool('p4', abort=False)
 
         self.revmap = {}
-        self.encoding = self.ui.config('convert', 'p4.encoding')
+        self.encoding = self.ui.config('convert', 'p4.encoding',
+                                       convcmd.orig_encoding)
         self.re_type = re.compile(
             "([a-z]+)?(text|binary|symlink|apple|resource|unicode|utf\d+)"
             "(\+\w+)?$")

--- a/mercurial/configitems.py	Fri Nov 24 21:51:41 2017 -0500
+++ b/mercurial/configitems.py	Tue Nov 28 23:20:08 2017 -0500
@@ -208,6 +208,99 @@
     default=None,
     generic=True,
 )
+coreconfigitem('convert', 'cvsps.cache',
+    default=True,
+)
+coreconfigitem('convert', 'cvsps.fuzz',
+    default=60,
+)
+coreconfigitem('convert', 'cvsps.logencoding',
+    default=None,
+)
+coreconfigitem('convert', 'cvsps.mergefrom',
+    default=None,
+)
+coreconfigitem('convert', 'cvsps.mergeto',
+    default=None,
+)
+coreconfigitem('convert', 'git.committeractions',
+    default=lambda: ['messagedifferent'],
+)
+coreconfigitem('convert', 'git.extrakeys',
+    default=list,
+)
+coreconfigitem('convert', 'git.findcopiesharder',
+    default=False,
+)
+coreconfigitem('convert', 'git.remoteprefix',
+    default='remote',
+)
+coreconfigitem('convert', 'git.renamelimit',
+    default=400,
+)
+coreconfigitem('convert', 'git.saverev',
+    default=True,
+)
+coreconfigitem('convert', 'git.similarity',
+    default=50,
+)
+coreconfigitem('convert', 'git.skipsubmodules',
+    default=False,
+)
+coreconfigitem('convert', 'hg.clonebranches',
+    default=False,
+)
+coreconfigitem('convert', 'hg.ignoreerrors',
+    default=False,
+)
+coreconfigitem('convert', 'hg.revs',
+    default=None,
+)
+coreconfigitem('convert', 'hg.saverev',
+    default=False,
+)
+coreconfigitem('convert', 'hg.sourcename',
+    default=None,
+)
+coreconfigitem('convert', 'hg.startrev',
+    default=None,
+)
+coreconfigitem('convert', 'hg.tagsbranch',
+    default='default',
+)
+coreconfigitem('convert', 'hg.usebranchnames',
+    default=True,
+)
+coreconfigitem('convert', 'ignoreancestorcheck',
+    default=False,
+)
+coreconfigitem('convert', 'localtimezone',
+    default=False,
+)
+coreconfigitem('convert', 'p4.encoding',
+    default=dynamicdefault,
+)
+coreconfigitem('convert', 'p4.startrev',
+    default=0,
+)
+coreconfigitem('convert', 'skiptags',
+    default=False,
+)
+coreconfigitem('convert', 'svn.debugsvnlog',
+    default=True,
+)
+coreconfigitem('convert', 'svn.trunk',
+    default=None,
+)
+coreconfigitem('convert', 'svn.tags',
+    default=None,
+)
+coreconfigitem('convert', 'svn.branches',
+    default=None,
+)
+coreconfigitem('convert', 'svn.startrev',
+    default=0,
+)
 coreconfigitem('debug', 'dirstate.delaywrite',
     default=0,
 )

--- a/tests/test-lfconvert.t	Fri Nov 24 21:51:41 2017 -0500
+++ b/tests/test-lfconvert.t	Tue Nov 28 23:20:08 2017 -0500
@@ -233,9 +233,10 @@
   $ cd ..
 
 round-trip: converting back to a normal (non-largefiles) repo with
-"lfconvert --to-normal" should give the same as ../bigfile-repo
+"lfconvert --to-normal" should give the same as ../bigfile-repo.  The
+convert extension is disabled to show config items can be loaded without it.
   $ cd largefiles-repo
-  $ hg lfconvert --to-normal . ../normal-repo
+  $ hg --config extensions.convert=! lfconvert --to-normal . ../normal-repo
   initializing destination ../normal-repo
   0 additional largefiles cached
   scanning source...