define new debug keyword arg

diff --git a/doc/README.virtualisation-server b/doc/README.virtualisation-server
index ed2002a40bffdf6580c5772155acbaa71ea9513e..8bcdedf50ba672f3b3fb7139c357ea5d7ffcfa1a 100644 (file)
--- a/doc/README.virtualisation-server
+++ b/doc/README.virtualisation-server
@@ -92,7 +92,8 @@ Protocol
 
 
 * Command
-       execute <program>,<arg>,<arg>... <stdin> <stdout> <stderr> <cwd>
+       execute <program>,<arg>,<arg>... <stdin> <stdout> <stderr> <cwd> \
+               [<keyword-args> ...]
   response
        ok <exit-status>
 
@@ -100,6 +101,16 @@ Protocol
   url-encoded).  stdin, stdout, stderr are files on the testbed
   (must be files, not pipes).
 
+  Currently defined keyword arguments:
+
+       debug=<tfd>-<hfd>
+
+               Arranges to pass fd <tfd> the testbed command, and
+               send all output to it to the fd <hfd> as passed
+               by the virt server's caller.
+
+               If this feature is available, execute-debug will
+               be advertised.  Only one such plumbing is available.
 
 * Commands
        copydown <host-tree> <testbed-path>