--- a/mercurial/subrepo.py	Mon Dec 20 13:59:33 2010 -0500
+++ b/mercurial/subrepo.py	Mon Dec 20 13:59:33 2010 -0500
@@ -903,6 +903,29 @@
         ui.progress(_('archiving (%s)') % relpath, None)
 
 
+    def status(self, rev2, **opts):
+        rev1 = self._state[1]
+        modified, added, removed = [], [], []
+        if rev2:
+            command = ['diff-tree', rev1, rev2]
+        else:
+            command = ['diff-index', rev1]
+        out = self._gitcommand(command)
+        for line in out.split('\n'):
+            tab = line.find('\t')
+            if tab == -1:
+                continue
+            status, f = line[tab - 1], line[tab + 1:]
+            if status == 'M':
+                modified.append(f)
+            elif status == 'A':
+                added.append(f)
+            elif status == 'D':
+                removed.append(f)
+
+        deleted = unknown = ignored = clean = []
+        return modified, added, removed, deleted, unknown, ignored, clean
+
 types = {
     'hg': hgsubrepo,
     'svn': svnsubrepo,

--- a/tests/test-subrepo-git.t	Mon Dec 20 13:59:33 2010 -0500
+++ b/tests/test-subrepo-git.t	Mon Dec 20 13:59:33 2010 -0500
@@ -52,6 +52,8 @@
   $ git checkout -q -b testing origin/testing >/dev/null
 
   $ cd ..
+  $ hg status --subrepos
+  M s/g
   $ hg commit -m 'update git subrepo'
   committing subrepository s
   $ hg debugsub
@@ -99,6 +101,8 @@
 
   $ cd ../ta
   $ echo ggg >> s/g
+  $ hg status --subrepos
+  M s/g
   $ hg commit -m ggg
   committing subrepository s
   $ hg debugsub
@@ -119,6 +123,8 @@
   $ git add f
   $ cd ..
 
+  $ hg status --subrepos
+  A s/f
   $ hg commit -m f
   committing subrepository s
   $ hg debugsub
@@ -160,6 +166,10 @@
   ggg
   $ hg commit -m 'merge'
   committing subrepository s
+  $ hg status --subrepos --rev 1:5
+  M .hgsubstate
+  M s/g
+  A s/f
   $ hg debugsub
   path s
    source   ../gitroot
@@ -282,6 +292,8 @@
 nested commit
 
   $ echo ffff >> inner/s/f
+  $ hg status --subrepos
+  M inner/s/f
   $ hg commit -m nested
   committing subrepository inner
   committing subrepository inner/s