lxccontainer: add lxc_config_item_is_supported()

This adds lxc_config_item_is_supported() as API extension. It allows to check whether a given config item (e.g. lxc.autodev) is supported by this LXC instance. The function is useful in the following scenarios: 1. Users have compiled liblxc from source and have removed a config items from the corresponding struct in confile.c. (For example, embedded users might decide to gut a bunch of options that they cannot use.) 2. Callers that want to check for a specific configuration item independent of the version numbers exposed in our version.h header. Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

lxccontainer: add lxc_config_item_is_supported()
12461428 · Christian Brauner · 2c0807c7 · 12461428 · 12461428
Unverified Commit 12461428 authored May 03, 2017 by Christian Brauner
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lxccontainer.c src/lxc/lxccontainer.c +5 -0

lxccontainer.h src/lxc/lxccontainer.h +7 -0

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--- a/src/lxc/lxccontainer.c
+++ b/src/lxc/lxccontainer.c
@@ -4522,3 +4522,8 @@ free_ct_name:
 	free(ct_name);
 	return ret;
 }
+
+bool lxc_config_item_is_supported(const char *key)
+{
+	return !!lxc_getconfig(key);
+}
--- a/src/lxc/lxccontainer.h
+++ b/src/lxc/lxccontainer.h
@@ -1022,6 +1022,13 @@ int list_all_containers(const char *lxcpath, char ***names, struct lxc_container
 */
 void lxc_log_close(void);

+/*!
+ * \brief Check if the configuration item is supported by this LXC instance.
+ *
+ * \param key Configuration item to check for.
+ */
+bool lxc_config_item_is_supported(const char *key);
+
 #ifdef  __cplusplus
 }
 #endif