diff --git a/hgext/fetch.py b/hgext/fetch.py
--- a/hgext/fetch.py
+++ b/hgext/fetch.py
@@ -67,7 +67,7 @@ def fetch(ui, repo, source='default', **
                         util.removeauth(other.url())))
             force_editor = opts.get('force_editor') or opts.get('edit')
             n = repo.commit(mod + add + rem, message,
-                            opts['user'], opts['date'],
+                            opts['user'], opts['date'], force=True,
                             force_editor=force_editor)
             ui.status(_('new changeset %d:%s merges remote changes '
                         'with local\n') % (repo.changelog.rev(n),
diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -539,6 +539,9 @@ def commit(ui, repo, *pats, **opts):
     If a list of files is omitted, all changes reported by "hg status"
     will be committed.
 
+    If you are committing the result of a merge, do not provide any
+    file names or -I/-X filters.
+
     If no commit message is specified, the configured editor is started to
     enter a message.
 
diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -781,6 +781,11 @@ class localrepository(repo.repository):
             if use_dirstate:
                 p1, p2 = self.dirstate.parents()
                 update_dirstate = True
+
+                if (not force and p2 != nullid and
+                    (files or match != util.always)):
+                    raise util.Abort(_('cannot partially commit a merge '
+                                       '(do not specify files or patterns)'))
             else:
                 p1, p2 = p1, p2 or nullid
                 update_dirstate = (self.dirstate.parents()[0] == p1)
diff --git a/tests/test-glog b/tests/test-glog
--- a/tests/test-glog
+++ b/tests/test-glog
@@ -82,7 +82,7 @@ commit()
     fi
     echo $rev > $rev
     hg add $rev
-    hg ci -d "$rev 0" -m "($rev) $msg" $rev
+    hg rawcommit -q -d "$rev 0" -m "($rev) $msg" $rev
 }
 
 echo "[extensions]" >> $HGRCPATH
diff --git a/tests/test-glog.out b/tests/test-glog.out
--- a/tests/test-glog.out
+++ b/tests/test-glog.out
@@ -1,11 +1,41 @@
 % init
 % empty repo
 % building tree
-created new head
-created new head
-created new head
-created new head
-created new head
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
+(the rawcommit command is deprecated)
 % glog -q
 @  34:0eed7cd895e0
 |
diff --git a/tests/test-parentrevspec b/tests/test-parentrevspec
--- a/tests/test-parentrevspec
+++ b/tests/test-parentrevspec
@@ -16,7 +16,7 @@ commit()
 
     echo >> foo
 
-    hg commit -d '0 0' -qAm "$msg" foo
+    hg commit -d '0 0' -qAm "$msg"
 }
 
 hg init repo