[libvirt] [PATCH 4/7] lxc: initialize logging configuration

[Amy Griffis <amy.griffis@xxxxxx>]

Before launching the lxc controller, have the lxc driver query the log
settings and setup envp[]. This provides the advantage of honoring the
actual log configuration instead of only what had been set in the
environment. The lxc controller now simply has to call
virLogSetFromEnv().
---

 src/lxc/lxc_controller.c |    3 ++
 src/lxc/lxc_driver.c     |   73 ++++++++++++++++++++++++++++++++++++++++------
 2 files changed, 66 insertions(+), 10 deletions(-)

diff --git a/src/lxc/lxc_controller.c b/src/lxc/lxc_controller.c
index bca721b..545f718 100644
--- a/src/lxc/lxc_controller.c
+++ b/src/lxc/lxc_controller.c
@@ -793,6 +793,9 @@ int main(int argc, char *argv[])
         }
     }
 
+    /* Initialize logging */
+    virLogSetFromEnv();
+
     /* Accept initial client which is the libvirtd daemon */
     if ((client = accept(monitor, NULL, 0)) < 0) {
         virReportSystemError(NULL, errno, "%s",
diff --git a/src/lxc/lxc_driver.c b/src/lxc/lxc_driver.c
index 5fb4105..c5a49f2 100644
--- a/src/lxc/lxc_driver.c
+++ b/src/lxc/lxc_driver.c
@@ -830,9 +830,13 @@ static int lxcControllerStart(virConnectPtr conn,
 {
     int i;
     int rc;
-    int ret = -1;
     int largc = 0, larga = 0;
     const char **largv = NULL;
+    int lenvc = 0, lenva = 0;
+    const char **lenv = NULL;
+    virBuffer filterbuf = VIR_BUFFER_INITIALIZER;
+    virBuffer outputbuf = VIR_BUFFER_INITIALIZER;
+    char *tmp;
     pid_t child;
     int status;
     fd_set keepfd;
@@ -863,6 +867,48 @@ static int lxcControllerStart(virConnectPtr conn,
             goto no_memory;                                             \
     } while (0)
 
+#define ADD_ENV_SPACE                                                   \
+    do {                                                                \
+        if (lenvc == lenva) {                                           \
+            lenva += 10;                                                \
+            if (VIR_REALLOC_N(lenv, lenva) < 0)                         \
+                goto no_memory;                                         \
+        }                                                               \
+    } while (0)
+
+#define ADD_ENV(thisarg)                                                \
+    do {                                                                \
+        ADD_ENV_SPACE;                                                  \
+        lenv[lenvc++] = thisarg;                                        \
+    } while (0)
+    
+#define ADD_ENV_PAIR(envname, val)                                      \
+    do {                                                                \
+        char *envval;                                                   \
+        ADD_ENV_SPACE;                                                  \
+        if (virAsprintf(&envval, "%s=%s", envname, val) < 0)            \
+            goto no_memory;                                             \
+        lenv[lenvc++] = envval;                                         \
+    } while (0)
+
+    if (virAsprintf(&tmp, "LIBVIRT_DEBUG=%d", virLogGetDefaultPriority()) < 0)
+        goto no_memory;
+    ADD_ENV(tmp);
+
+    if (virLogGetNbFilters() > 0) {
+        if (virLogGetFilters(&filterbuf) < 0)
+            goto no_memory;
+        ADD_ENV_PAIR("LIBVIRT_LOG_FILTERS", virBufferContentAndReset(&filterbuf));
+    }
+
+    if (virLogGetNbOutputs() > 0) {
+        if (virLogGetOutputs(&outputbuf) < 0)
+            goto no_memory;
+        ADD_ENV_PAIR("LIBVIRT_LOG_OUTPUTS", virBufferContentAndReset(&outputbuf));
+    }
+
+    ADD_ENV(NULL);
+
     snprintf(appPtyStr, sizeof(appPtyStr), "%d", appPty);
 
     emulator = vm->def->emulator;
@@ -883,7 +929,7 @@ static int lxcControllerStart(virConnectPtr conn,
 
     FD_SET(appPty, &keepfd);
 
-    if (virExec(conn, largv, NULL, &keepfd, &child,
+    if (virExec(conn, largv, lenv, &keepfd, &child,
                 -1, &logfd, &logfd,
                 VIR_EXEC_NONE) < 0)
         goto cleanup;
@@ -910,18 +956,25 @@ static int lxcControllerStart(virConnectPtr conn,
 #undef ADD_ARG
 #undef ADD_ARG_LIT
 #undef ADD_ARG_SPACE
+#undef ADD_ENV_SPACE
+#undef ADD_ENV_PAIR
 
-    ret = 0;
-
-cleanup:
-    for (i = 0 ; i < largc ; i++)
-        VIR_FREE(largv[i]);
-
-    return ret;
+    return 0;
 
 no_memory:
     virReportOOMError(conn);
-    goto cleanup;
+cleanup:
+    if (largv) {
+        for (i = 0 ; i < largc ; i++)
+            VIR_FREE(largv[i]);
+        VIR_FREE(largv);
+    }
+    if (lenv) {
+        for (i=0 ; i < lenvc ; i++)
+            VIR_FREE(lenv[i]);
+        VIR_FREE(lenv);
+    }
+    return -1;
 }
 
 

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