--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -896,7 +896,7 @@ def copy(ui, repo, *pats, **opts):
 
 def debugancestor(ui, index, rev1, rev2):
     """find the ancestor revision of two revisions in a given index"""
-    r = revlog.revlog(file, index, "")
+    r = revlog.revlog(util.opener(os.getcwd()), index, "")
     a = r.ancestor(r.lookup(rev1), r.lookup(rev2))
     ui.write("%d:%s\n" % (r.rev(a), hex(a)))
 
@@ -969,7 +969,7 @@ def debugstate(ui, repo):
 
 def debugdata(ui, file_, rev):
     """dump the contents of an data file revision"""
-    r = revlog.revlog(file, file_[:-2] + ".i", file_)
+    r = revlog.revlog(util.opener(os.getcwd()), file_[:-2] + ".i", file_)
     try:
         ui.write(r.revision(r.lookup(rev)))
     except KeyError:
@@ -977,7 +977,7 @@ def debugdata(ui, file_, rev):
 
 def debugindex(ui, file_):
     """dump the contents of an index file"""
-    r = revlog.revlog(file, file_, "")
+    r = revlog.revlog(util.opener(os.getcwd()), file_, "")
     ui.write("   rev    offset  length   base linkrev" +
              " nodeid       p1           p2\n")
     for i in range(r.count()):
@@ -988,7 +988,7 @@ def debugindex(ui, file_):
 
 def debugindexdot(ui, file_):
     """dump an index DAG as a .dot file"""
-    r = revlog.revlog(file, file_, "")
+    r = revlog.revlog(util.opener(os.getcwd()), file_, "")
     ui.write("digraph G {\n")
     for i in range(r.count()):
         e = r.index[i]