--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -690,12 +690,12 @@ def debugstate(ui, repo):
 
 def debugdata(ui, file_, rev):
     """dump the contents of an data file revision"""
-    r = hg.revlog(hg.opener(""), file_[:-2] + ".i", file_)
+    r = hg.revlog(file, file_[:-2] + ".i", file_)
     ui.write(r.revision(r.lookup(rev)))
 
 def debugindex(ui, file_):
     """dump the contents of an index file"""
-    r = hg.revlog(hg.opener(""), file_, "")
+    r = hg.revlog(file, file_, "")
     ui.write("   rev    offset  length   base linkrev" +
              " nodeid       p1           p2\n")
     for i in range(r.count()):
@@ -706,7 +706,7 @@ def debugindex(ui, file_):
 
 def debugindexdot(ui, file_):
     """dump an index DAG as a .dot file"""
-    r = hg.revlog(hg.opener(""), file_, "")
+    r = hg.revlog(file, file_, "")
     ui.write("digraph G {\n")
     for i in range(r.count()):
         e = r.index[i]