Re: [Xen-cim] Detection of host instrumentation

[Jim Fehlig <jfehlig@xxxxxxxxxx>]

Jim Fehlig wrote:
> After thinking about several approaches for ensuring that host 
> instrumentation is available at build time, I've concluded they all 
> suck and we should just document this dependency :-).
> Detecting existence of dependent providers during configure requires 
> asking the cimom (assuming it is running) for a known registered 
> profile or class.  This is the only way I see of reliably determining 
> if the build host has the required instrumentation - and I'm not 
> comfortable doing such hackery in the configure script.
> I like the runtime discovery we have previously discussed, but it is 
> useless without our own instrumentation to fall back on in the event 
> nothing is found - and I don't want to be in the host instrumentation 
> business given the existence of OMC, SBLIM, etc.
> I have two suggestions for handling the host instrumentation dependency.
>
> 1. Just document that the existence of virtualization model depends on 
> existence of related modeling.  We could provide instructions in the 
> README for obtaining and installing the OMC project and be done with it.
> 2. Same as above but with added 'feature' of specifying host 
> instrumentation via a configure argument.  E.g. one could run 
> './configure --with-omc' or './configure --with-sblim'.  The configure 
> script would not detect existence of the instrumentation - just use 
> some knowledge about these projects to determine namespace and 
> classnames of host instrumentation for use throughout the providers.  
> If not specified, default to OMC.
> Option 2 seems reasonable and allows for using SBLIM providers on 
> Pegasus until such time OMC providers can run in that environment.  
> User is still responsible for ensuring the host instrumentation is 
> installed and functional.
Attached is a patch for the planned approach to handle host 
instrumentation.  OMC is the default but users can run './configure 
--with-host-instrumentation=sblim' to use sblim providers.  A namespace 
and class prefix is written to config.h which can be used in the 
association providers when making upcalls.  Using this technique we can, 
for example, ask for finer-grained CIM_ComputerSystem - 
Linux_ComputerSystem.
Any problems with this?  If not I will proceed forward.  Silence == 
agreement :-).
Jim

diff -r 16d625984bc4 configure.ac
--- a/configure.ac      Thu Sep 28 17:07:14 2006 -0600
+++ b/configure.ac      Wed Oct 04 16:21:27 2006 -0600
@@ -118,6 +118,30 @@ LIBXM_LIBS="$libvirt_LIBS $libxml2_LIBS 
 LIBXM_LIBS="$libvirt_LIBS $libxml2_LIBS "
 AC_SUBST([LIBXM_CFLAGS])
 AC_SUBST([LIBXM_LIBS])
+
+# Add argument to allow specifying which host instrumentation
+# to use.  omc or sblim are the options, omc is default.
+HOST_INSTRUMENTATION="omc"
+AC_ARG_WITH([host-instrumentation],
+       [  --with-host-instrumentation=TYPE  supported types are omc and sblim],
+       [
+               if test "x$withval" != "xno" ; then
+                       
+                       HOST_INSTRUMENTATION="$withval" 
+               fi
+       ]
+)
+
+if test "x$HOST_INSTRUMENTATION" = "xomc" ; then
+       AC_DEFINE([HOST_INSTRUMENTATION_NS],  ["smash"], [Namespace where host 
instrumentation resides.])
+       AC_DEFINE([HOST_INSTRUMENTATION_PREFIX],  ["OMC_"], [Prefix of host 
instrumentation class names.])
+elif test "x$HOST_INSTRUMENTATION" = "xsblim" ; then
+       AC_DEFINE([HOST_INSTRUMENTATION_NS],  ["root/cimv2"], [Namespace where 
host instrumentation resides.])
+       AC_DEFINE([HOST_INSTRUMENTATION_PREFIX],  ["Linux_"], [Prefix of host 
instrumentation class names.])
+else
+       AC_MSG_ERROR([unrecognized host instrumentation $HOST_INSTRUMENTATION])
+fi
+
 
 # Set compiler flag for CMPI API version compatibility
 # SET THE PACKAGE CMPI_VERSION HERE
@@ -189,6 +213,7 @@ if test x"$TESTSUITEDIR" != x; then
 if test x"$TESTSUITEDIR" != x; then
    echo "   TESTSUITEDIR: " $TESTSUITEDIR
 fi
+echo "   HOST_INSTRUMENTATION: " $HOST_INSTRUMENTATION
 echo "   CPPFLAGS:" $CPPFLAGS
 echo
 echo "You can override these values by setting the corresponding"

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