[PATCH 5 of 6] extensions: prohibit registration of command without using @command

Yuya Nishihara yuya at tcha.org
Sat May 13 05:57:36 EDT 2017


# HG changeset patch
# User Yuya Nishihara <yuya at tcha.org>
# Date 1494657710 -32400
#      Sat May 13 15:41:50 2017 +0900
# Node ID 484b2808830a2a390d9e1128c6e88d9249097fa6
# Parent  1d3639b4640fc0cb9d11e8263126f271917b9889
extensions: prohibit registration of command without using @command

Detect the problem earlier for better error indication. I'm tired of teaching
users that the mq extension is not guilty but the third-party extension is.

https://bitbucket.org/tortoisehg/thg/issues?q=%27norepo%27

diff --git a/mercurial/extensions.py b/mercurial/extensions.py
--- a/mercurial/extensions.py
+++ b/mercurial/extensions.py
@@ -118,6 +118,19 @@ def _reportimporterror(ui, err, failed, 
     if ui.debugflag:
         ui.traceback()
 
+# attributes set by registrar.command
+_cmdfuncattrs = ('norepo', 'optionalrepo', 'inferrepo')
+
+def _validatecmdtable(cmdtable):
+    """Check if extension commands have required attributes"""
+    for c, e in cmdtable.iteritems():
+        f = e[0]
+        missing = [a for a in _cmdfuncattrs if not util.safehasattr(f, a)]
+        if not missing:
+            continue
+        raise error.ProgrammingError("missing attributes in command '%s': %s"
+                                     % (c, ', '.join(missing)))
+
 def load(ui, name, path):
     if name.startswith('hgext.') or name.startswith('hgext/'):
         shortname = name[6:]
@@ -139,6 +152,7 @@ def load(ui, name, path):
         ui.warn(_('(third party extension %s requires version %s or newer '
                   'of Mercurial; disabling)\n') % (shortname, minver))
         return
+    _validatecmdtable(getattr(mod, 'cmdtable', {}))
 
     _extensions[shortname] = mod
     _order.append(shortname)
diff --git a/tests/test-extension.t b/tests/test-extension.t
--- a/tests/test-extension.t
+++ b/tests/test-extension.t
@@ -1534,6 +1534,38 @@ disabling in command line overlays with 
 
   $ cd ..
 
+Prohibit registration of commands that don't use @command (issue5137)
+
+  $ hg init deprecated
+  $ cd deprecated
+
+  $ cat <<EOF > deprecatedcmd.py
+  > def deprecatedcmd(repo, ui):
+  >     pass
+  > cmdtable = {
+  >     'deprecatedcmd': (deprecatedcmd, [], ''),
+  > }
+  > EOF
+  $ cat <<EOF > .hg/hgrc
+  > [extensions]
+  > deprecatedcmd = `pwd`/deprecatedcmd.py
+  > mq = !
+  > hgext.mq = !
+  > hgext/mq = !
+  > EOF
+
+  $ hg deprecatedcmd > /dev/null
+  *** failed to import extension deprecatedcmd from $TESTTMP/deprecated/deprecatedcmd.py: missing attributes in command 'deprecatedcmd': norepo, optionalrepo, inferrepo
+  hg: unknown command 'deprecatedcmd'
+  [255]
+
+ the extension shouldn't be loaded at all so the mq works:
+
+  $ hg version --config extensions.mq= > /dev/null
+  *** failed to import extension deprecatedcmd from $TESTTMP/deprecated/deprecatedcmd.py: missing attributes in command 'deprecatedcmd': norepo, optionalrepo, inferrepo
+
+  $ cd ..
+
 Test synopsis and docstring extending
 
   $ hg init exthelp


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