remove logfile and loglevel from struct lxc_conf

src/lxc/conf.c

@@ -2077,7 +2077,6 @@ struct lxc_conf *lxc_conf_init(void)
 	new->console.name[0] = '\0';
 	new->maincmd_fd = -1;
 	new->rootfs.mount = default_rootfs_mount;
-	new->loglevel = LXC_LOG_PRIORITY_NOTSET;
 	lxc_list_init(&new->cgroup);
 	lxc_list_init(&new->network);
 	lxc_list_init(&new->mount_list);
@@ -2938,8 +2937,6 @@ void lxc_conf_free(struct lxc_conf *conf)
 		free(conf->ttydir);
 	if (conf->fstab)
 		free(conf->fstab);
-	if (conf->logfile)
-		free(conf->logfile);
 	lxc_clear_config_network(conf);
 #if HAVE_APPARMOR
 	if (conf->aa_profile)

src/lxc/conf.h

@@ -246,8 +246,6 @@ struct lxc_conf {
 #if HAVE_APPARMOR
 	char *aa_profile;
 #endif
-	char *logfile;
-	int loglevel;
 
 #if HAVE_APPARMOR /* || HAVE_SELINUX || HAVE_SMACK */
 	int lsm_umount_proc;

src/lxc/confile.c

@@ -922,46 +922,31 @@ static int config_aa_profile(const char *key, const char *value,
 static int config_logfile(const char *key, const char *value,
 			     struct lxc_conf *lxc_conf)
 {
-	char *path;
-
-	// if given a blank entry, null out any previous entries.
-	if (!value || strlen(value) == 0) {
-		if (lxc_conf->logfile) {
-			free(lxc_conf->logfile);
-			lxc_conf->logfile = NULL;
-		}
+	if (lxc_log_get_file()) {
+		DEBUG("Log file already specified - ignoring new value");
 		return 0;
 	}
 
-	path = strdup(value);
-	if (!path) {
-		SYSERROR("failed to strdup '%s': %m", value);
-		return -1;
-	}
-
-	if (lxc_log_set_file(path)) {
-		free(path);
-		return -1;
-	}
-
-	if (lxc_conf->logfile)
-		free(lxc_conf->logfile);
-	lxc_conf->logfile = path;
-
-	return 0;
+	return lxc_log_set_file(value);
 }
 
 static int config_loglevel(const char *key, const char *value,
 			     struct lxc_conf *lxc_conf)
 {
+	int newlevel;
+
 	if (!value || strlen(value) == 0)
 		return 0;
 
+	if (lxc_log_get_level() != LXC_LOG_PRIORITY_NOTSET) {
+		DEBUG("Log level already set - ignoring new value");
+		return 0;
+	}
 	if (value[0] >= '0' && value[0] <= '9')
-		lxc_conf->loglevel = atoi(value);
+		newlevel = atoi(value);
 	else
-		lxc_conf->loglevel = lxc_log_priority_to_int(value);
-	return lxc_log_set_level(lxc_conf->loglevel);
+		newlevel = lxc_log_priority_to_int(value);
+	return lxc_log_set_level(newlevel);
 }
 
 static int config_autodev(const char *key, const char *value,
@@ -1612,9 +1597,9 @@ int lxc_get_config_item(struct lxc_conf *c, const char *key, char *retv,
 		v = c->aa_profile;
 #endif
 	else if (strcmp(key, "lxc.logfile") == 0)
-		v = c->logfile;
+		v = lxc_log_get_file();
 	else if (strcmp(key, "lxc.loglevel") == 0)
-		v = lxc_log_priority_to_string(c->loglevel);
+		v = lxc_log_priority_to_string(lxc_log_get_level());
 	else if (strcmp(key, "lxc.cgroup") == 0) // all cgroup info
 		return lxc_get_cgroup_entry(c, retv, inlen, "all");
 	else if (strncmp(key, "lxc.cgroup.", 11) == 0) // specific cgroup info
@@ -1694,10 +1679,10 @@ void write_config(FILE *fout, struct lxc_conf *c)
 	if (c->aa_profile)
 		fprintf(fout, "lxc.aa_profile = %s\n", c->aa_profile);
 #endif
-	if (c->loglevel != LXC_LOG_PRIORITY_NOTSET)
-		fprintf(fout, "lxc.loglevel = %s\n", lxc_log_priority_to_string(c->loglevel));
-	if (c->logfile)
-		fprintf(fout, "lxc.logfile = %s\n", c->logfile);
+	if (lxc_log_get_level() != LXC_LOG_PRIORITY_NOTSET)
+		fprintf(fout, "lxc.loglevel = %s\n", lxc_log_priority_to_string(lxc_log_get_level()));
+	if (lxc_log_get_file())
+		fprintf(fout, "lxc.logfile = %s\n", lxc_log_get_file());
 	lxc_list_for_each(it, &c->cgroup) {
 		struct lxc_cgroup *cg = it->elem;
 		fprintf(fout, "lxc.cgroup.%s = %s\n", cg->subsystem, cg->value);

src/lxc/log.c

@@ -41,7 +41,7 @@
 
 int lxc_log_fd = -1;
 static char log_prefix[LXC_LOG_PREFIX_SIZE] = "lxc";
-int lxc_loglevel_specified = 0;
+static int lxc_loglevel_specified = 0;
 
 lxc_log_define(lxc_log, lxc);
 
@@ -176,17 +176,8 @@ extern int lxc_log_init(const char *file, const char *priority,
 	if (prefix)
 		lxc_log_setprefix(prefix);
 
-	if (file) {
-		int fd;
-
-		fd = log_open(file);
-		if (fd == -1) {
-			ERROR("failed to initialize log service");
-			return -1;
-		}
-
-		lxc_log_fd = fd;
-	}
+	if (file)
+		return lxc_log_set_file(file);
 
 	return 0;
 }
@@ -208,21 +199,39 @@ extern int lxc_log_set_level(int level)
 	return 0;
 }
 
+char *log_fname;  // default to NULL, set in lxc_log_set_file.
+
 /*
  * 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
  * settings.  So only set the logfile if previously unset.
  */
-extern int lxc_log_set_file(char *fname)
+extern int lxc_log_set_file(const char *fname)
 {
 	if (lxc_log_fd != -1) {
-		INFO("Configuration file was specified on command line, configuration file entry being ignored");
-		return 0;
+		// this should've been caught at config_logfile.
+		ERROR("Race in setting logfile?");
+		return -1;
 	}
+
 	lxc_log_fd = log_open(fname);
 	if (lxc_log_fd == -1) {
 		ERROR("failed to open log file %s\n", fname);
 		return -1;
 	}
+
+	log_fname = strdup(fname);
 	return 0;
 }
+
+extern int lxc_log_get_level(void)
+{
+	if (!lxc_loglevel_specified)
+		return LXC_LOG_PRIORITY_NOTSET;
+	return lxc_log_category_lxc.priority;
+}
+
+extern const char *lxc_log_get_file(void)
+{
+	return log_fname;
+}

src/lxc/log.h

@@ -292,5 +292,7 @@ extern int lxc_log_init(const char *file, const char *priority,
 
 extern void lxc_log_setprefix(const char *a_prefix);
 extern int lxc_log_set_level(int level);
-extern int lxc_log_set_file(char *fname);
+extern int lxc_log_set_file(const char *fname);
+extern int lxc_log_get_level(void);
+extern const char *lxc_log_get_file(void);
 #endif