confile: list namespaced keys

src/lxc/confile.c

@@ -4453,6 +4453,67 @@ int lxc_list_config_items(char *retv, int inlen)
 	return fulllen;
 }
 
+int lxc_list_subkeys(struct lxc_conf *conf, const char *key, char *retv,
+		     int inlen)
+{
+	int len;
+	int fulllen = 0;
+
+	if (!retv)
+		inlen = 0;
+	else
+		memset(retv, 0, inlen);
+
+	if (!strcmp(key, "lxc.apparmor")) {
+		strprint(retv, inlen, "allow_incomplete\n");
+		strprint(retv, inlen, "profile\n");
+	} else if (!strcmp(key, "lxc.selinux")) {
+		strprint(retv, inlen, "context\n");
+	} else if (!strcmp(key, "lxc.mount")) {
+		strprint(retv, inlen, "auto\n");
+		strprint(retv, inlen, "entry\n");
+		strprint(retv, inlen, "fstab\n");
+	} else if (!strcmp(key, "lxc.rootfs")) {
+		strprint(retv, inlen, "mount\n");
+		strprint(retv, inlen, "options\n");
+		strprint(retv, inlen, "path\n");
+	} else if (!strcmp(key, "lxc.uts")) {
+		strprint(retv, inlen, "name\n");
+	} else if (!strcmp(key, "lxc.hook")) {
+		strprint(retv, inlen, "autodev\n");
+		strprint(retv, inlen, "clone\n");
+		strprint(retv, inlen, "destroy\n");
+		strprint(retv, inlen, "mount\n");
+		strprint(retv, inlen, "post-stop\n");
+		strprint(retv, inlen, "pre-mount\n");
+		strprint(retv, inlen, "pre-start\n");
+		strprint(retv, inlen, "start\n");
+		strprint(retv, inlen, "stop\n");
+	} else if (!strcmp(key, "lxc.cap")) {
+		strprint(retv, inlen, "drop\n");
+		strprint(retv, inlen, "keep\n");
+	} else if (!strcmp(key, "lxc.console")) {
+		strprint(retv, inlen, "logfile\n");
+		strprint(retv, inlen, "path\n");
+	} else if (!strcmp(key, "lxc.seccomp")) {
+		strprint(retv, inlen, "profile\n");
+	} else if (!strcmp(key, "lxc.signal")) {
+		strprint(retv, inlen, "halt\n");
+		strprint(retv, inlen, "reboot\n");
+		strprint(retv, inlen, "stop\n");
+	} else if (!strcmp(key, "lxc.start")) {
+		strprint(retv, inlen, "auto\n");
+		strprint(retv, inlen, "delay\n");
+		strprint(retv, inlen, "order\n");
+	} else if (!strcmp(key, "lxc.monitor")) {
+		strprint(retv, inlen, "unshare\n");
+	} else {
+		fulllen = -1;
+	}
+
+	return fulllen;
+}
+
 int lxc_list_net(struct lxc_conf *c, const char *key, char *retv, int inlen)
 {
 	int len;

src/lxc/confile.h

@@ -33,10 +33,21 @@
 struct lxc_conf;
 struct lxc_list;
 
+/* Callback prototype to set a configuration item.
+ * Must be implemented when adding a new configuration key.
+ */
 typedef int (*config_set_cb)(const char *key, const char *value,
 			     struct lxc_conf *conf, void *data);
+
+/* Callback prototype to get a configuration item.
+ * Must be implemented when adding a new configuration key.
+ */
 typedef int (*config_get_cb)(const char *key, char *value, int inlen,
 			     struct lxc_conf *conf, void *data);
+
+/* Callback prototype to clear a configuration item.
+ * Must be implemented when adding a new configuration key.
+ */
 typedef int (*config_clr_cb)(const char *key, struct lxc_conf *conf,
 			     void *data);
 
@@ -47,37 +58,60 @@ struct lxc_config_t {
 	config_clr_cb clr;
 };
 
+/* Get the jump table entry for the given configuration key. */
 extern struct lxc_config_t *lxc_get_config(const char *key);
 
+/* List all available config items. */
+extern int lxc_list_config_items(char *retv, int inlen);
+
+/* Given a configuration key namespace (e.g. lxc.apparmor) list all associated
+ * subkeys for that namespace.
+ * Must be implemented when adding a new configuration key.
+ */
+extern int lxc_list_subkeys(struct lxc_conf *conf, const char *key, char *retv,
+			    int inlen);
+
 /* List all configuration items associated with a given network. For example
  * pass "lxc.net.[i]" to retrieve all configuration items associated with
  * the network associated with index [i].
  */
 extern int lxc_list_net(struct lxc_conf *c, const char *key, char *retv,
 			int inlen);
-extern int lxc_list_config_items(char *retv, int inlen);
-extern int lxc_config_read(const char *file, struct lxc_conf *conf, bool from_include);
+
+extern int lxc_config_read(const char *file, struct lxc_conf *conf,
+			   bool from_include);
+
 extern int append_unexp_config_line(const char *line, struct lxc_conf *conf);
 
 extern int lxc_config_define_add(struct lxc_list *defines, char* arg);
+
 extern int lxc_config_define_load(struct lxc_list *defines,
 				  struct lxc_conf *conf);
 
 /* needed for lxc-attach */
 extern signed long lxc_config_parse_arch(const char *arch);
+
 extern int lxc_fill_elevated_privileges(char *flaglist, int *flags);
 
 extern int lxc_clear_config_item(struct lxc_conf *c, const char *key);
+
 extern void write_config(FILE *fout, struct lxc_conf *c);
 
-extern bool do_append_unexp_config_line(struct lxc_conf *conf, const char *key, const char *v);
+extern bool do_append_unexp_config_line(struct lxc_conf *conf, const char *key,
+					const char *v);
 
 /* These are used when cloning a container */
-extern void clear_unexp_config_line(struct lxc_conf *conf, const char *key, bool rm_subkeys);
+extern void clear_unexp_config_line(struct lxc_conf *conf, const char *key,
+				    bool rm_subkeys);
+
 extern bool clone_update_unexp_hooks(struct lxc_conf *conf, const char *oldpath,
-	const char *newpath, const char *oldname, const char *newmame);
+				     const char *newpath, const char *oldname,
+				     const char *newmame);
+
 bool clone_update_unexp_ovl_paths(struct lxc_conf *conf, const char *oldpath,
 				  const char *newpath, const char *oldname,
 				  const char *newname, const char *ovldir);
+
 extern bool network_new_hwaddrs(struct lxc_conf *conf);
-#endif
+
+#endif /* __LXC_CONFILE_H */

src/lxc/lxccontainer.c

@@ -2268,6 +2268,8 @@ static int do_lxcapi_get_keys(struct lxc_container *c, const char *key, char *re
 		ret = lxc_list_net(c->lxc_conf, key, retv, inlen);
 	else if (strncmp(key, "lxc.network.", 12) == 0)
 		ret = lxc_list_nicconfigs_legacy(c->lxc_conf, key, retv, inlen);
+	else
+		ret = lxc_list_subkeys(c->lxc_conf, key, retv, inlen);
 
 	container_mem_unlock(c);
 	return ret;