bin: config: reload: Enable hot reloading via config file (#7204)

* bin: config: reload: Enable hot reloading via config file

This service configuration option should be used as:

```conf
[SERVICE]
    hot_reload on
    # .. other stuffs
```

Signed-off-by: Hiroshi Hatake <[email protected]>

Author: cosmo0920

include/fluent-bit/flb_config.h

@@ -336,6 +336,8 @@ enum conf_type {
 #define FLB_CONF_STR_ENABLE_CHUNK_TRACE      "Enable_Chunk_Trace"
 #endif /* FLB_HAVE_CHUNK_TRACE */
 
+#define FLB_CONF_STR_HOT_RELOAD        "Hot_Reload"
+
 /* DNS */
 #define FLB_CONF_DNS_MODE              "dns.mode"
 #define FLB_CONF_DNS_RESOLVER          "dns.resolver"

src/flb_config.c

@@ -173,6 +173,10 @@ struct flb_service_config service_configs[] = {
      offsetof(struct flb_config, enable_chunk_trace)},
 #endif
 
+    {FLB_CONF_STR_HOT_RELOAD,
+     FLB_CONF_TYPE_BOOL,
+     offsetof(struct flb_config, enable_hot_reload)},
+
     {NULL, FLB_CONF_TYPE_OTHER, 0} /* end of array */
 };
 

src/flb_reload.c

@@ -422,8 +422,6 @@ int flb_reload(flb_ctx_t *ctx, struct flb_cf *cf_opts)
     /* Inherit verbose from the old ctx instance */
     verbose = ctx->config->verbose;
     new_config->verbose = verbose;
-    enable_reloading = ctx->config->enable_hot_reload;
-    new_config->enable_hot_reload = enable_reloading;
 
 #ifdef FLB_HAVE_STREAM_PROCESSOR
     /* Inherit stream processor definitions from command line */

src/fluent-bit.c

@@ -979,7 +979,7 @@ int flb_main(int argc, char **argv)
             config->support_mode = FLB_TRUE;
             break;
         case 'Y':
-            config->enable_hot_reload = FLB_TRUE;
+            flb_cf_section_property_add(cf_opts, service->properties, FLB_CONF_STR_HOT_RELOAD, 0, "on", 0);
             break;
 #ifdef FLB_HAVE_CHUNK_TRACE
         case 'Z':