[libvirt] [PATCH] Load CPU map from builddir when run uninstalled

[Jiri Denemark]

When libvirtd is run from a build directory without being installed, it
should not depend on files from a libvirt package installed in the
system. Not only because there may not be any libvirt installed at all.
We already do a good job for plugins but cpu_map.xml was still loaded
from the system.

The Makefile.am change is necessary to make this all work from VPATH
builds since libvirtd has no idea where to find libvirt sources. It only
knows the path from which it was started, i.e, a builddir.

https://bugzilla.redhat.com/show_bug.cgi?id=1074327
Signed-off-by: Jiri Denemark <jdenemar at redhat.com>
---
 daemon/libvirtd.c | 7 ++++++-
 src/Makefile.am   | 4 ++++
 src/cpu/cpu_map.c | 3 +++
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/daemon/libvirtd.c b/daemon/libvirtd.c
index 72f0e81..d91e1e9 100644
--- a/daemon/libvirtd.c
+++ b/daemon/libvirtd.c
@@ -103,6 +103,7 @@
 #include "configmake.h"
 
 #include "virdbus.h"
+#include "cpu/cpu_map.h"
 
 #if WITH_SASL
 virNetSASLContextPtr saslCtxt = NULL;
@@ -1155,13 +1156,16 @@ int main(int argc, char **argv) {
     if (strstr(argv[0], "lt-libvirtd") ||
         strstr(argv[0], "/daemon/.libs/libvirtd")) {
         char *tmp = strrchr(argv[0], '/');
+        char *cpumap;
         if (!tmp) {
             fprintf(stderr, _("%s: cannot identify driver directory\n"), argv[0]);
             exit(EXIT_FAILURE);
         }
         *tmp = '\0';
         char *driverdir;
-        if (virAsprintfQuiet(&driverdir, "%s/../../src/.libs", argv[0]) < 0) {
+        if (virAsprintfQuiet(&driverdir, "%s/../../src/.libs", argv[0]) < 0 ||
+            virAsprintfQuiet(&cpumap, "%s/../../src/cpu/cpu_map.xml",
+                             argv[0]) < 0) {
             fprintf(stderr, _("%s: initialization failed\n"), argv[0]);
             exit(EXIT_FAILURE);
         }
@@ -1174,6 +1178,7 @@ int main(int argc, char **argv) {
 #ifdef WITH_DRIVER_MODULES
         virDriverModuleInitialize(driverdir);
 #endif
+        cpuMapOverride(cpumap);
         *tmp = '/';
         /* Must not free 'driverdir' - it is still used */
     }
diff --git a/src/Makefile.am b/src/Makefile.am
index 25d0370..306880b 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -977,6 +977,10 @@ libvirt_la_BUILT_LIBADD += libvirt_cpu.la
 libvirt_cpu_la_CFLAGS = \
 		-I$(top_srcdir)/src/conf $(AM_CFLAGS)
 libvirt_cpu_la_SOURCES = $(CPU_SOURCES)
+libvirt_cpu_la_DEPENDENCIES = $(abs_builddir)/cpu/cpu_map.xml
+
+$(abs_builddir)/cpu/cpu_map.xml:
+	$(AM_V_GEN)ln -s $(srcdir)/cpu/cpu_map.xml $@
 
 if WITH_VMX
 noinst_LTLIBRARIES += libvirt_vmx.la
diff --git a/src/cpu/cpu_map.c b/src/cpu/cpu_map.c
index 7c2bdec..f6c63d4 100644
--- a/src/cpu/cpu_map.c
+++ b/src/cpu/cpu_map.c
@@ -28,6 +28,7 @@
 #include "cpu_map.h"
 #include "configmake.h"
 #include "virstring.h"
+#include "virlog.h"
 
 #define VIR_FROM_THIS VIR_FROM_CPU
 
@@ -86,6 +87,8 @@ int cpuMapLoad(const char *arch,
     int element;
     const char *mapfile = (cpumap ? cpumap : CPUMAPFILE);
 
+    VIR_DEBUG("Loading CPU map from %s", mapfile);
+
     if (arch == NULL) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        "%s", _("undefined hardware architecture"));
-- 
1.9.0