Merge

17 files changed, 409 insertions, 35 deletions

diff --git a/indra/llmessage/CMakeLists.txt b/indra/llmessage/CMakeLists.txt
index 453286b83d..3eceda7901 100644
--- a/indra/llmessage/CMakeLists.txt
+++ b/indra/llmessage/CMakeLists.txt
@@ -23,6 +23,7 @@ include_directories(
 
 set(llmessage_SOURCE_FILES
     llares.cpp
+    llareslistener.cpp
     llassetstorage.cpp
     llblowfishcipher.cpp
     llbuffer.cpp
@@ -105,6 +106,7 @@ set(llmessage_HEADER_FILES
     CMakeLists.txt
 
     llares.h
+    llareslistener.h
     llassetstorage.h
     llblowfishcipher.h
     llbuffer.h
@@ -224,6 +226,7 @@ IF (NOT LINUX AND VIEWER)
       lltemplatemessagedispatcher.cpp
       llregionpresenceverifier.cpp
       )
+
 #    set(TEST_DEBUG on)
     set(test_libs
       ${LLMESSAGE_LIBRARIES}
diff --git a/indra/llmessage/llares.cpp b/indra/llmessage/llares.cpp
index fe37fe8142..acbf51d75c 100644
--- a/indra/llmessage/llares.cpp
+++ b/indra/llmessage/llares.cpp
@@ -33,6 +33,7 @@
  */
 
 #include "linden_common.h"
+#include "llares.h"
 
 #include <ares_dns.h>
 #include <ares_version.h>
@@ -42,9 +43,10 @@
 #include "apr_poll.h"
 
 #include "llapr.h"
-#include "llares.h"
+#include "llareslistener.h"
 
 #if defined(LL_WINDOWS)
+#pragma warning (disable : 4355) // 'this' used in initializer list: yes, intentionally
 # define ns_c_in 1
 # define NS_HFIXEDSZ     12      /* #/bytes of fixed data in header */
 # define NS_QFIXEDSZ     4       /* #/bytes of fixed data in query */
@@ -102,7 +104,9 @@ void LLAres::QueryResponder::queryError(int code)
 }
 
 LLAres::LLAres() :
-chan_(NULL), mInitSuccess(false)
+    chan_(NULL),
+    mInitSuccess(false),
+    mListener(new LLAresListener("LLAres", this))
 {
 	if (ares_init(&chan_) != ARES_SUCCESS)
 	{
diff --git a/indra/llmessage/llares.h b/indra/llmessage/llares.h
index c709a08499..78febcd560 100644
--- a/indra/llmessage/llares.h
+++ b/indra/llmessage/llares.h
@@ -36,7 +36,13 @@
 #define LL_LLARES_H
 
 #ifdef LL_WINDOWS
+// ares.h is broken on windows in that it depends on types defined in ws2tcpip.h
+// we need to include them first to work around it, but the headers issue warnings
+# pragma warning(push)
+# pragma warning(disable:4996)
+# include <winsock2.h>
 # include <ws2tcpip.h>
+# pragma warning(pop)
 #endif
 
 #ifdef LL_STANDALONE
@@ -49,7 +55,10 @@
 #include "llrefcount.h"
 #include "lluri.h"
 
+#include <boost/shared_ptr.hpp>
+
 class LLQueryResponder;
+class LLAresListener;
 
 /**
  * @brief Supported DNS RR types.
@@ -444,6 +453,9 @@ public:
 protected:
 	ares_channel chan_;
 	bool mInitSuccess;
+    // boost::scoped_ptr would actually fit the requirement better, but it
+    // can't handle incomplete types as boost::shared_ptr can.
+    boost::shared_ptr<LLAresListener> mListener;
 };
 	
 /**
diff --git a/indra/llmessage/llareslistener.cpp b/indra/llmessage/llareslistener.cpp
new file mode 100644
index 0000000000..a8beb8cbde
--- /dev/null
+++ b/indra/llmessage/llareslistener.cpp
@@ -0,0 +1,75 @@
+/**
+ * @file   llareslistener.cpp
+ * @author Nat Goodspeed
+ * @date   2009-03-18
+ * @brief  Implementation for llareslistener.
+ * 
+ * $LicenseInfo:firstyear=2009&license=viewergpl$
+ * Copyright (c) 2009, Linden Research, Inc.
+ * $/LicenseInfo$
+ */
+
+// Precompiled header
+#include "linden_common.h"
+// associated header
+#include "llareslistener.h"
+// STL headers
+// std headers
+// external library headers
+// other Linden headers
+#include "llares.h"
+#include "llerror.h"
+#include "llevents.h"
+#include "llsdutil.h"
+
+LLAresListener::LLAresListener(const std::string& pumpname, LLAres* llares):
+    LLDispatchListener(pumpname, "op"),
+    mAres(llares)
+{
+    // add() every method we want to be able to invoke via this event API.
+    // Optional third parameter validates expected LLSD request structure.
+    add("rewriteURI", &LLAresListener::rewriteURI,
+        LLSD().insert("uri", LLSD()).insert("reply", LLSD()));
+}
+
+/// This UriRewriteResponder subclass packages returned URIs as an LLSD
+/// array to send back to the requester.
+class UriRewriteResponder: public LLAres::UriRewriteResponder
+{
+public:
+    /**
+     * Specify the request, containing the event pump name on which to send
+     * the reply.
+     */
+    UriRewriteResponder(const LLSD& request):
+        mReqID(request),
+        mPumpName(request["reply"])
+    {}
+
+    /// Called by base class with results. This is called in both the
+    /// success and error cases. On error, the calling logic passes the
+    /// original URI.
+    virtual void rewriteResult(const std::vector<std::string>& uris)
+    {
+        LLSD result;
+        for (std::vector<std::string>::const_iterator ui(uris.begin()), uend(uris.end());
+             ui != uend; ++ui)
+        {
+            result.append(*ui);
+        }
+        // This call knows enough to avoid trying to insert a map key into an
+        // LLSD array. It's there so that if, for any reason, we ever decide
+        // to change the response from array to map, it will Just Start Working.
+        mReqID.stamp(result);
+        LLEventPumps::instance().obtain(mPumpName).post(result);
+    }
+
+private:
+    LLReqID mReqID;
+    const std::string mPumpName;
+};
+
+void LLAresListener::rewriteURI(const LLSD& data)
+{
+    mAres->rewriteURI(data["uri"], new UriRewriteResponder(data));
+}
diff --git a/indra/llmessage/llareslistener.h b/indra/llmessage/llareslistener.h
new file mode 100644
index 0000000000..bf093b3d3d
--- /dev/null
+++ b/indra/llmessage/llareslistener.h
@@ -0,0 +1,37 @@
+/**
+ * @file   llareslistener.h
+ * @author Nat Goodspeed
+ * @date   2009-03-18
+ * @brief  LLEventPump API for LLAres. This header doesn't actually define the
+ *         API; the API is defined by the pump name on which this class
+ *         listens, and by the expected content of LLSD it receives.
+ * 
+ * $LicenseInfo:firstyear=2009&license=viewergpl$
+ * Copyright (c) 2009, Linden Research, Inc.
+ * $/LicenseInfo$
+ */
+
+#if ! defined(LL_LLARESLISTENER_H)
+#define LL_LLARESLISTENER_H
+
+#include "lleventdispatcher.h"
+
+class LLAres;
+class LLSD;
+
+/// Listen on an LLEventPump with specified name for LLAres request events.
+class LLAresListener: public LLDispatchListener
+{
+public:
+    /// Specify the pump name on which to listen, and bind the LLAres instance
+    /// to use (e.g. gAres)
+    LLAresListener(const std::string& pumpname, LLAres* llares);
+
+private:
+    /// command["op"] == "rewriteURI" 
+    void rewriteURI(const LLSD& data);
+
+    LLAres* mAres;
+};
+
+#endif /* ! defined(LL_LLARESLISTENER_H) */
diff --git a/indra/llmessage/llcachename.h b/indra/llmessage/llcachename.h
index c044b3d80d..8641437d86 100644
--- a/indra/llmessage/llcachename.h
+++ b/indra/llmessage/llcachename.h
@@ -42,9 +42,9 @@ class LLUUID;
 
 
 typedef boost::signals2::signal<void (const LLUUID& id,
-							const std::string& first_name,
-							const std::string& last_name,
-							BOOL is_group)> LLCacheNameSignal;
+                                      const std::string& first_name,
+                                      const std::string& last_name,
+                                      BOOL is_group)> LLCacheNameSignal;
 typedef LLCacheNameSignal::slot_type LLCacheNameCallback;
 
 // Old callback with user data for compatability
diff --git a/indra/llmessage/llinstantmessage.cpp b/indra/llmessage/llinstantmessage.cpp
index 7c63625004..3da41939fa 100644
--- a/indra/llmessage/llinstantmessage.cpp
+++ b/indra/llmessage/llinstantmessage.cpp
@@ -40,7 +40,7 @@
 #include "lluuid.h"
 #include "llsd.h"
 #include "llsdserialize.h"
-#include "llsdutil.h"
+#include "llsdutil_math.h"
 #include "llpointer.h"
 #include "message.h"
 
diff --git a/indra/llmessage/llpartdata.cpp b/indra/llmessage/llpartdata.cpp
index 485bc6aa44..9376cde7b5 100644
--- a/indra/llmessage/llpartdata.cpp
+++ b/indra/llmessage/llpartdata.cpp
@@ -39,6 +39,8 @@
 #include "v4coloru.h"
 
 #include "llsdutil.h"
+#include "llsdutil_math.h"
+
 
 
 const S32 PS_PART_DATA_BLOCK_SIZE = 4 + 2 + 4 + 4 + 2 + 2; // 18
diff --git a/indra/llmessage/llregionpresenceverifier.cpp b/indra/llmessage/llregionpresenceverifier.cpp
index e02c735ce7..b1868e6a00 100644
--- a/indra/llmessage/llregionpresenceverifier.cpp
+++ b/indra/llmessage/llregionpresenceverifier.cpp
@@ -30,6 +30,8 @@
  * $/LicenseInfo$
  */
 
+#include "linden_common.h"
+
 #include "llregionpresenceverifier.h"
 #include "llhttpclientinterface.h"
 #include <sstream>
diff --git a/indra/llmessage/llsdmessage.cpp b/indra/llmessage/llsdmessage.cpp
index 9967a6197f..2cb742e261 100644
--- a/indra/llmessage/llsdmessage.cpp
+++ b/indra/llmessage/llsdmessage.cpp
@@ -68,6 +68,7 @@ bool LLSDMessage::httpListener(const LLSD& request)
     }
     LLHTTPClient::post(url, payload,
                        new LLSDMessage::EventResponder(LLEventPumps::instance(),
+                                                       request,
                                                        url, "POST", reply, error),
                        LLSD(),      // headers
                        timeout);
@@ -81,7 +82,9 @@ void LLSDMessage::EventResponder::result(const LLSD& data)
     // to the pump whose name is "".
     if (! mReplyPump.empty())
     {
-        mPumps.obtain(mReplyPump).post(data);
+        LLSD response(data);
+        mReqID.stamp(response);
+        mPumps.obtain(mReplyPump).post(response);
     }
     else                            // default success handling
     {
@@ -98,7 +101,7 @@ void LLSDMessage::EventResponder::errorWithContent(U32 status, const std::string
     // explicit pump name.
     if (! mErrorPump.empty())
     {
-        LLSD info;
+        LLSD info(mReqID.makeResponse());
         info["target"]  = mTarget;
         info["message"] = mMessage;
         info["status"]  = LLSD::Integer(status);
diff --git a/indra/llmessage/llsdmessage.h b/indra/llmessage/llsdmessage.h
index 65503756a8..6ee00fd41d 100644
--- a/indra/llmessage/llsdmessage.h
+++ b/indra/llmessage/llsdmessage.h
@@ -121,9 +121,11 @@ private:
          * (e.g. "POST") as @a message.
          */
         EventResponder(LLEventPumps& pumps,
+                       const LLSD& request,
                        const std::string& target, const std::string& message,
                        const std::string& replyPump, const std::string& errorPump):
             mPumps(pumps),
+            mReqID(request),
             mTarget(target),
             mMessage(message),
             mReplyPump(replyPump),
@@ -135,6 +137,7 @@ private:
     
     private:
         LLEventPumps& mPumps;
+        LLReqID mReqID;
         const std::string mTarget, mMessage, mReplyPump, mErrorPump;
     };
 
diff --git a/indra/llmessage/llsdmessagebuilder.cpp b/indra/llmessage/llsdmessagebuilder.cpp
index 21937f022f..6e41b03895 100755
--- a/indra/llmessage/llsdmessagebuilder.cpp
+++ b/indra/llmessage/llsdmessagebuilder.cpp
@@ -37,6 +37,7 @@
 #include "llmessagetemplate.h"
 #include "llquaternion.h"
 #include "llsdutil.h"
+#include "llsdutil_math.h"
 #include "llsdserialize.h"
 #include "u64.h"
 #include "v3dmath.h"
diff --git a/indra/llmessage/llsdmessagereader.cpp b/indra/llmessage/llsdmessagereader.cpp
index e699ec9e28..845a12d23b 100755
--- a/indra/llmessage/llsdmessagereader.cpp
+++ b/indra/llmessage/llsdmessagereader.cpp
@@ -38,6 +38,7 @@
 #include "llsdmessagebuilder.h"
 #include "llsdutil.h"
 
+#include "llsdutil_math.h"
 #include "v3math.h"
 #include "v4math.h"
 #include "v3dmath.h"
diff --git a/indra/llmessage/tests/llareslistener_test.cpp b/indra/llmessage/tests/llareslistener_test.cpp
new file mode 100644
index 0000000000..ac4886ccf4
--- /dev/null
+++ b/indra/llmessage/tests/llareslistener_test.cpp
@@ -0,0 +1,200 @@
+/**
+ * @file   llareslistener_test.cpp
+ * @author Mark Palange
+ * @date   2009-02-26
+ * @brief  Tests of llareslistener.h.
+ * 
+ * $LicenseInfo:firstyear=2009&license=internal$
+ * Copyright (c) 2009, Linden Research, Inc.
+ * $/LicenseInfo$
+ */
+
+#if LL_WINDOWS
+#pragma warning (disable : 4355) // 'this' used in initializer list: yes, intentionally
+#endif
+
+// Precompiled header
+#include "linden_common.h"
+// associated header
+#include "../llareslistener.h"
+// STL headers
+#include <iostream>
+// std headers
+// external library headers
+#include <boost/bind.hpp>
+
+// other Linden headers
+#include "llsd.h"
+#include "llares.h"
+#include "../test/lltut.h"
+#include "llevents.h"
+#include "tests/wrapllerrs.h"
+
+/*****************************************************************************
+*   Dummy stuff
+*****************************************************************************/
+LLAres::LLAres():
+    // Simulate this much of the real LLAres constructor: we need an
+    // LLAresListener instance.
+    mListener(new LLAresListener("LLAres", this))
+{}
+LLAres::~LLAres() {}
+void LLAres::rewriteURI(const std::string &uri,
+					LLAres::UriRewriteResponder *resp)
+{
+	// This is the only LLAres method I chose to implement.
+	// The effect is that LLAres returns immediately with
+	// a result that is equal to the input uri.
+	std::vector<std::string> result;
+	result.push_back(uri);
+	resp->rewriteResult(result);
+}
+
+LLAres::QueryResponder::~QueryResponder() {}
+void LLAres::QueryResponder::queryError(int) {}
+void LLAres::QueryResponder::queryResult(char const*, size_t) {}
+LLQueryResponder::LLQueryResponder() {}
+void LLQueryResponder::queryResult(char const*, size_t) {}
+void LLQueryResponder::querySuccess() {}
+void LLAres::UriRewriteResponder::queryError(int) {}
+void LLAres::UriRewriteResponder::querySuccess() {}
+void LLAres::UriRewriteResponder::rewriteResult(const std::vector<std::string>& uris) {}
+
+/*****************************************************************************
+*   TUT
+*****************************************************************************/
+namespace tut
+{
+    struct data
+    {
+        LLAres dummyAres;
+    };
+    typedef test_group<data> llareslistener_group;
+    typedef llareslistener_group::object object;
+    llareslistener_group llareslistenergrp("llareslistener");
+
+	struct ResponseCallback
+	{
+		std::vector<std::string> mURIs;
+		bool operator()(const LLSD& response)
+		{
+            mURIs.clear();
+            for (LLSD::array_const_iterator ri(response.beginArray()), rend(response.endArray());
+                 ri != rend; ++ri)
+            {
+                mURIs.push_back(*ri);
+            }
+            return false;
+		}
+	};
+
+    template<> template<>
+    void object::test<1>()
+    {
+        set_test_name("test event");
+		// Tests the success and failure cases, since they both use 
+		// the same code paths in the LLAres responder.
+		ResponseCallback response;
+        std::string pumpname("trigger");
+        // Since we're asking LLEventPumps to obtain() the pump by the desired
+        // name, it will persist beyond the current scope, so ensure we
+        // disconnect from it when 'response' goes away.
+        LLTempBoundListener temp(
+            LLEventPumps::instance().obtain(pumpname).listen("rewriteURIresponse",
+                                                             boost::bind(&ResponseCallback::operator(), &response, _1)));
+        // Now build an LLSD request that will direct its response events to
+        // that pump.
+		const std::string testURI("login.bar.com");
+        LLSD request;
+        request["op"] = "rewriteURI";
+        request["uri"] = testURI;
+        request["reply"] = pumpname;
+        LLEventPumps::instance().obtain("LLAres").post(request);
+		ensure_equals(response.mURIs.size(), 1);
+		ensure_equals(response.mURIs.front(), testURI); 
+	}
+
+    template<> template<>
+    void object::test<2>()
+    {
+        set_test_name("bad op");
+        WrapLL_ERRS capture;
+        LLSD request;
+        request["op"] = "foo";
+        std::string threw;
+        try
+        {
+            LLEventPumps::instance().obtain("LLAres").post(request);
+        }
+        catch (const WrapLL_ERRS::FatalException& e)
+        {
+            threw = e.what();
+        }
+        ensure_contains("LLAresListener bad op", threw, "bad");
+    }
+
+    template<> template<>
+    void object::test<3>()
+    {
+        set_test_name("bad rewriteURI request");
+        WrapLL_ERRS capture;
+        LLSD request;
+        request["op"] = "rewriteURI";
+        std::string threw;
+        try
+        {
+            LLEventPumps::instance().obtain("LLAres").post(request);
+        }
+        catch (const WrapLL_ERRS::FatalException& e)
+        {
+            threw = e.what();
+        }
+        ensure_contains("LLAresListener bad req", threw, "missing");
+        ensure_contains("LLAresListener bad req", threw, "reply");
+        ensure_contains("LLAresListener bad req", threw, "uri");
+    }
+
+    template<> template<>
+    void object::test<4>()
+    {
+        set_test_name("bad rewriteURI request");
+        WrapLL_ERRS capture;
+        LLSD request;
+        request["op"] = "rewriteURI";
+        request["reply"] = "nonexistent";
+        std::string threw;
+        try
+        {
+            LLEventPumps::instance().obtain("LLAres").post(request);
+        }
+        catch (const WrapLL_ERRS::FatalException& e)
+        {
+            threw = e.what();
+        }
+        ensure_contains("LLAresListener bad req", threw, "missing");
+        ensure_contains("LLAresListener bad req", threw, "uri");
+        ensure_does_not_contain("LLAresListener bad req", threw, "reply");
+    }
+
+    template<> template<>
+    void object::test<5>()
+    {
+        set_test_name("bad rewriteURI request");
+        WrapLL_ERRS capture;
+        LLSD request;
+        request["op"] = "rewriteURI";
+        request["uri"] = "foo.bar.com";
+        std::string threw;
+        try
+        {
+            LLEventPumps::instance().obtain("LLAres").post(request);
+        }
+        catch (const WrapLL_ERRS::FatalException& e)
+        {
+            threw = e.what();
+        }
+        ensure_contains("LLAresListener bad req", threw, "missing");
+        ensure_contains("LLAresListener bad req", threw, "reply");
+        ensure_does_not_contain("LLAresListener bad req", threw, "uri");
+    }
+}
diff --git a/indra/llmessage/tests/llregionpresenceverifier_test.cpp b/indra/llmessage/tests/llregionpresenceverifier_test.cpp
index b7602ef15c..c86126406e 100644
--- a/indra/llmessage/tests/llregionpresenceverifier_test.cpp
+++ b/indra/llmessage/tests/llregionpresenceverifier_test.cpp
@@ -29,6 +29,8 @@
  * $/LicenseInfo$
  */
 
+#include "linden_common.h"
+
 #include "../test/lltut.h"
 #include "llregionpresenceverifier.h"
 #include "llcurl_stub.cpp"
diff --git a/indra/llmessage/tests/test_llsdmessage_peer.py b/indra/llmessage/tests/test_llsdmessage_peer.py
index e62f20912b..86d5761b1b 100644
--- a/indra/llmessage/tests/test_llsdmessage_peer.py
+++ b/indra/llmessage/tests/test_llsdmessage_peer.py
@@ -16,16 +16,12 @@ import os
 import sys
 from threading import Thread
 from BaseHTTPServer import HTTPServer, BaseHTTPRequestHandler
+
 mydir = os.path.dirname(__file__)       # expected to be .../indra/llmessage/tests/
 sys.path.insert(0, os.path.join(mydir, os.pardir, os.pardir, "lib", "python"))
 from indra.util.fastest_elementtree import parse as xml_parse
 from indra.base import llsd
-
-def debug(*args):
-    sys.stdout.writelines(args)
-    sys.stdout.flush()
-# comment out the line below to enable debug output
-debug = lambda *args: None
+from testrunner import run, debug
 
 class TestHTTPRequestHandler(BaseHTTPRequestHandler):
     """This subclass of BaseHTTPRequestHandler is to receive and echo
@@ -106,25 +102,5 @@ class TestHTTPServer(Thread):
         debug("Starting HTTP server...\n")
         httpd.serve_forever()
 
-def main(*args):
-    # Start HTTP server thread. Note that this and all other comm server
-    # threads should be daemon threads: we'll let them run "forever,"
-    # confident that the whole process will terminate when the main thread
-    # terminates, which will be when the test executable child process
-    # terminates.
-    httpThread = TestHTTPServer(name="httpd")
-    httpThread.setDaemon(True)
-    httpThread.start()
-    # choice of os.spawnv():
-    # - [v vs. l] pass a list of args vs. individual arguments,
-    # - [no p] don't use the PATH because we specifically want to invoke the
-    #   executable passed as our first arg,
-    # - [no e] child should inherit this process's environment.
-    debug("Running %s...\n" % (" ".join(args)))
-    sys.stdout.flush()
-    rc = os.spawnv(os.P_WAIT, args[0], args)
-    debug("%s returned %s\n" % (args[0], rc))
-    return rc
-
 if __name__ == "__main__":
-    sys.exit(main(*sys.argv[1:]))
+    sys.exit(run(server=TestHTTPServer(name="httpd"), *sys.argv[1:]))
diff --git a/indra/llmessage/tests/testrunner.py b/indra/llmessage/tests/testrunner.py
new file mode 100644
index 0000000000..3b9c3a7a19
--- /dev/null
+++ b/indra/llmessage/tests/testrunner.py
@@ -0,0 +1,53 @@
+#!/usr/bin/python
+"""\
+@file   testrunner.py
+@author Nat Goodspeed
+@date   2009-03-20
+@brief  Utilities for writing wrapper scripts for ADD_COMM_BUILD_TEST unit tests
+
+$LicenseInfo:firstyear=2009&license=viewergpl$
+Copyright (c) 2009, Linden Research, Inc.
+$/LicenseInfo$
+"""
+
+import os
+import sys
+
+def debug(*args):
+    sys.stdout.writelines(args)
+    sys.stdout.flush()
+# comment out the line below to enable debug output
+debug = lambda *args: None
+
+def run(*args, **kwds):
+    """All positional arguments collectively form a command line, executed as
+    a synchronous child process.
+    In addition, pass server=new_thread_instance as an explicit keyword (to
+    differentiate it from an additional command-line argument).
+    new_thread_instance should be an instantiated but not yet started Thread
+    subclass instance, e.g.:
+    run("python", "-c", 'print "Hello, world!"', server=TestHTTPServer(name="httpd"))
+    """
+    # If there's no server= keyword arg, don't start a server thread: simply
+    # run a child process.
+    try:
+        thread = kwds.pop("server")
+    except KeyError:
+        pass
+    else:
+        # Start server thread. Note that this and all other comm server
+        # threads should be daemon threads: we'll let them run "forever,"
+        # confident that the whole process will terminate when the main thread
+        # terminates, which will be when the child process terminates.
+        thread.setDaemon(True)
+        thread.start()
+    # choice of os.spawnv():
+    # - [v vs. l] pass a list of args vs. individual arguments,
+    # - [no p] don't use the PATH because we specifically want to invoke the
+    #   executable passed as our first arg,
+    # - [no e] child should inherit this process's environment.
+    debug("Running %s...\n" % (" ".join(args)))
+    sys.stdout.flush()
+    rc = os.spawnv(os.P_WAIT, args[0], args)
+    debug("%s returned %s\n" % (args[0], rc))
+    return rc