Introduce toplevel openlmi config file

Toplevel openlmi configuration file (/etc/openlmi/openlmi.conf) now
contains common configuration options for all providers. Configuration
for each provider could be overriden in provider-specific config
(/etc/openlmi/$provider/$provider.conf).

This patch also modify config file handling in python providers to
include this config file.

There is also support for C providers (in libopenlmicommon) for reading
these config files and providing default configuration options.

1 files changed, 35 insertions, 0 deletions

diff --git a/src/openlmi.h b/src/openlmi.h
index 6ab4158..93778ce 100644
--- a/src/openlmi.h
+++ b/src/openlmi.h
@@ -23,6 +23,12 @@
 
 #include <cmpidt.h>
 
+typedef struct {
+    const char *group;
+    const char *key;
+    const char *value;
+} ConfigEntry;
+
 /**
  * This function returns FQDN (fully qualified domain name) of the machine
  *
@@ -43,6 +49,35 @@ const char *lmi_get_system_name();
 const char *lmi_get_system_creation_class_name();
 
 /**
+ * Initialize usage base openlmi tools like configuration file access,
+ * logging etc.
+ *
+ * @note You must call this function prior to getting any configuration option
+ * or usage of logging. lmi_get_system_creation_class_name requires that this
+ * function will be called first (SystemCreationClassName is read from config).
+ *
+ * This function is reentrant and thread safe, but it should be called always
+ * with same parameters
+ *
+ * @param provider Identification of the CIM provider (must be same as name of the
+ *             configuration file)
+ * @param cb CMPIBroker
+ * @param provider_config_defaults Array of default config values for given provider
+ *             NULL if there is no provider-specific configuration
+ */
+void lmi_init(const char *provider, const CMPIBroker *cb,
+              const ConfigEntry *provider_config_defaults);
+
+/**
+ * Reads string key out of configration files or default configration options.
+ *
+ * @param group Configration group
+ * @param key Configration key
+ * @return String value of the key or NULL if group/key is not found
+ */
+char *lmi_read_config(const char *group, const char *key);
+
+/**
  * To use standard CIMOM logging facility, broker must be assigned. Without
  * calling this function, logging will go to stderr.
  *