lxc-execute: allow lxc-init to log only when we have a valid log level

src/lxc/execute.c

@@ -96,8 +96,11 @@ static int execute_start(struct lxc_handler *handler, void* data)
 	argc_add = 4;
 	if (my_args->quiet)
 		argc_add++;
-	if (!handler->conf->rootfs.path)
-		argc_add+=6;
+	if (!handler->conf->rootfs.path) {
+		argc_add += 4;
+		if (lxc_log_has_valid_level())
+			argc_add += 2;
+	}
 
 	argv = malloc((argc + argc_add) * sizeof(*argv));
 	if (!argv)
@@ -116,8 +119,12 @@ static int execute_start(struct lxc_handler *handler, void* data)
 		argv[i++] = (char *)handler->name;
 		argv[i++] = "--lxcpath";
 		argv[i++] = (char *)handler->lxcpath;
-		argv[i++] = "--logpriority";
-		argv[i++] = (char *)lxc_log_priority_to_string(lxc_log_get_level());
+
+		if (lxc_log_has_valid_level()) {
+			argv[i++] = "--logpriority";
+			argv[i++] = (char *)
+				lxc_log_priority_to_string(lxc_log_get_level());
+		}
 	}
 	argv[i++] = "--";
 	for (j = 0; j < argc; j++)

src/lxc/log.c

@@ -370,6 +370,14 @@ extern int lxc_log_get_level(void)
 	return lxc_log_category_lxc.priority;
 }
 
+extern bool lxc_log_has_valid_level(void)
+{
+	int log_level = lxc_log_get_level();
+	if (log_level < 0 || log_level >= LXC_LOG_PRIORITY_NOTSET)
+		return false;
+	return true;
+}
+
 /*
  * This is called when we read a lxc.logfile entry in a lxc.conf file.  This
  * happens after processing command line arguments, which override the .conf

src/lxc/log.h

@@ -28,6 +28,7 @@
 #include <stdio.h>
 #include <sys/time.h>
 #include <string.h>
+#include <stdbool.h>
 
 #ifndef O_CLOEXEC
 #define O_CLOEXEC 02000000
@@ -296,5 +297,6 @@ extern int lxc_log_set_level(int level);
 extern void lxc_log_set_prefix(const char *prefix);
 extern const char *lxc_log_get_file(void);
 extern int lxc_log_get_level(void);
+extern bool lxc_log_has_valid_level(void);
 extern const char *lxc_log_get_prefix(void);
 #endif