new file mode 100644
--- /dev/null
+++ b/mercurial/sshserver.py
@@ -0,0 +1,100 @@
+# commands.py - command processing for mercurial
+#
+# Copyright 2005 Matt Mackall <mpm@selenic.com>
+#
+# This software may be used and distributed according to the terms
+# of the GNU General Public License, incorporated herein by reference.
+
+from demandload import demandload
+from i18n import gettext as _
+from node import *
+demandload(globals(), "sys util")
+
+class sshserver(object):
+    def __init__(self, ui, repo):
+        self.ui = ui
+        self.repo = repo
+        self.lock = None
+        self.fin = sys.stdin
+        self.fout = sys.stdout
+
+        sys.stdout = sys.stderr
+
+        # Prevent insertion/deletion of CRs
+        util.set_binary(self.fin)
+        util.set_binary(self.fout)
+
+    def getarg(self):
+        argline = self.fin.readline()[:-1]
+        arg, l = argline.split()
+        val = self.fin.read(int(l))
+        return arg, val
+
+    def respond(self, v):
+        self.fout.write("%d\n" % len(v))
+        self.fout.write(v)
+        self.fout.flush()
+
+    def serve_forever(self):
+        while self.serve_one(): pass
+        sys.exit(0)
+
+    def serve_one(self):
+        cmd = self.fin.readline()[:-1]
+        if cmd:
+            impl = getattr(self, 'do_' + cmd, None)
+            if impl: impl()
+        return cmd != ''
+
+    def do_heads(self):
+        h = self.repo.heads()
+        self.respond(" ".join(map(hex, h)) + "\n")
+
+    def do_lock(self):
+        self.lock = self.repo.lock()
+        self.respond("")
+
+    def do_unlock(self):
+        if self.lock:
+            self.lock.release()
+        self.lock = None
+        self.respond("")
+
+    def do_branches(self):
+        arg, nodes = self.getarg()
+        nodes = map(bin, nodes.split(" "))
+        r = []
+        for b in self.repo.branches(nodes):
+            r.append(" ".join(map(hex, b)) + "\n")
+        self.respond("".join(r))
+
+    def do_between(self):
+        arg, pairs = self.getarg()
+        pairs = [map(bin, p.split("-")) for p in pairs.split(" ")]
+        r = []
+        for b in self.repo.between(pairs):
+            r.append(" ".join(map(hex, b)) + "\n")
+        self.respond("".join(r))
+
+    def do_changegroup(self):
+        nodes = []
+        arg, roots = self.getarg()
+        nodes = map(bin, roots.split(" "))
+
+        cg = self.repo.changegroup(nodes, 'serve')
+        while True:
+            d = cg.read(4096)
+            if not d:
+                break
+            self.fout.write(d)
+
+        self.fout.flush()
+
+    def do_addchangegroup(self):
+        if not self.lock:
+            self.respond("not locked")
+            return
+
+        self.respond("")
+        r = self.repo.addchangegroup(self.fin, 'serve')
+        self.respond(str(r))