respect log priority for qemu domain logs

Closes: #524145

debian/patches/0006-only-log-qemu-monitor-commands-if-default-log-priori.patch

+From: =?utf-8?q?Guido=20G=C3=BCnther?= <agx@sigxcpu.org>
+Date: Thu, 16 Apr 2009 14:08:33 +0200
+Subject: [PATCH] only log qemu monitor commands if default log priority is VIR_LOG_DEBUG
+
+---
+ src/libvirt_debug.syms |    1 +
+ src/logging.c          |    9 +++++++++
+ src/logging.h          |    2 ++
+ src/qemu_driver.c      |   27 +++++++++++++++------------
+ 4 files changed, 27 insertions(+), 12 deletions(-)
+
+diff --git a/src/libvirt_debug.syms b/src/libvirt_debug.syms
+index 1742a0b..e2e0dbd 100644
+--- a/src/libvirt_debug.syms
++++ b/src/libvirt_debug.syms
+@@ -10,6 +10,7 @@ debugFlag;
+ # logging.h
+ virLogMessage;
+ virLogSetDefaultPriority;
++virLogGetDefaultPriority;
+ virLogDefineFilter;
+ virLogDefineOutput;
+ virLogParseFilters;
+diff --git a/src/logging.c b/src/logging.c
+index 9c8b0b9..c96c8d5 100644
+--- a/src/logging.c
++++ b/src/logging.c
+@@ -326,6 +326,15 @@ int virLogSetDefaultPriority(int priority) {
+ }
+ 
+ /**
++ * virLogGetDefaultPriority:
++ *
++ * Get the default priority level.
++ */
++int virLogGetDefaultPriority() {
++    return virLogDefaultPriority;
++}
++
++/**
+  * virLogResetFilters:
+  *
+  * Removes the set of logging filters defined.
+diff --git a/src/logging.h b/src/logging.h
+index 7ea8935..614aefb 100644
+--- a/src/logging.h
++++ b/src/logging.h
+@@ -111,6 +111,7 @@ typedef void (*virLogCloseFunc) (void *data);
+ #ifdef ENABLE_DEBUG
+ 
+ extern int virLogSetDefaultPriority(int priority);
++extern int virLogGetDefaultPriority(void);
+ extern int virLogDefineFilter(const char *match, int priority, int flags);
+ extern int virLogDefineOutput(virLogOutputFunc f, virLogCloseFunc c,
+                               void *data, int priority, int flags);
+@@ -131,6 +132,7 @@ extern void virLogMessage(const char *category, int priority,
+ #else /* ENABLE_DEBUG */
+ 
+ #define virLogSetDefaultPriority(p)
++#define virLogGetDefaultPriority()
+ #define virLogDefineFilter(m, p, f)
+ #define virLogDefineOutput(func, c, d, p, f)
+ #define virLogStartup()
+diff --git a/src/qemu_driver.c b/src/qemu_driver.c
+index 79ee072..d8cd4ee 100644
+--- a/src/qemu_driver.c
++++ b/src/qemu_driver.c
+@@ -1711,25 +1711,28 @@ qemudMonitorCommandExtra(const virDomainObjPtr vm,
+         }
+     }
+ 
+-    /* Log, but ignore failures to write logfile for VM */
+-    if (safewrite(vm->logfile, buf, strlen(buf)) < 0) {
+-        char ebuf[1024];
+-        VIR_WARN(_("Unable to log VM console data: %s\n"),
+-                 virStrerror(errno, ebuf, sizeof ebuf));
++    if (virLogGetDefaultPriority() <= VIR_LOG_DEBUG) {
++        /* Log, but ignore failures to write logfile for VM */
++        if (safewrite(vm->logfile, buf, strlen(buf)) < 0) {
++            char ebuf[1024];
++            VIR_WARN(_("Unable to log VM console data: %s\n"),
++                    virStrerror(errno, ebuf, sizeof ebuf));
++        }
+     }
+-
+     *reply = buf;
+     return 0;
+ 
+  error:
+     if (buf) {
+-        /* Log, but ignore failures to write logfile for VM */
+-        if (safewrite(vm->logfile, buf, strlen(buf)) < 0) {
+-            char ebuf[1024];
+-            VIR_WARN(_("Unable to log VM console data: %s\n"),
+-                     virStrerror(errno, ebuf, sizeof ebuf));
++        if (virLogGetDefaultPriority() <= VIR_LOG_WARN) {
++            /* Log, but ignore failures to write logfile for VM */
++            if (safewrite(vm->logfile, buf, strlen(buf)) < 0) {
++                char ebuf[1024];
++                VIR_WARN(_("Unable to log VM console data: %s\n"),
++                        virStrerror(errno, ebuf, sizeof ebuf));
++            }
++            VIR_FREE(buf);
+         }
+-        VIR_FREE(buf);
+     }
+     return -1;
+ }
+-- 

debian/patches/series

@@ -3,3 +3,4 @@
 0003-allow-libvirt-group-to-access-the-socket.patch
 0004-fix-Debian-specific-path-to-hvm-loader.patch
 0005-increase-buffer-on-ERANGE.patch
+0006-only-log-qemu-monitor-commands-if-default-log-priori.patch