Fix loading plugin fails with missing directory GH issue #3248 (#3315)

release_docs/RELEASE.txt

@@ -169,9 +169,16 @@ New Features
 
     Library:
     --------
+    - Change the error handling for a not found path in the find plugin process.
+
+      While attempting to load a plugin the HDF5 library will fail if one of the
+      directories in the plugin paths does not exist, even if there are more paths
+      to check. Instead of exiting the function with an error, just logged the error
+      and continue processing the list of paths to check.
+
     - Implemented support for temporary security credentials for the Read-Only
       S3 (ROS3) file driver.
-      
+
       When using temporary security credentials, one also needs to specify a
       session/security token next to the access key id and secret access key.
       This token can be specified by the new API function H5Pset_fapl_ros3_token().

src/H5PLpath.c

@@ -801,8 +801,7 @@ H5PL__find_plugin_in_path_table(const H5PL_search_params_t *search_params, hbool
 
         /* Search for the plugin in this path */
         if (H5PL__find_plugin_in_path(search_params, found, H5PL_paths_g[u], plugin_info) < 0)
-            HGOTO_ERROR(H5E_PLUGIN, H5E_CANTGET, FAIL, "search in path %s encountered an error",
-                        H5PL_paths_g[u])
+            HERROR(H5E_PLUGIN, H5E_CANTGET, "search in path %s encountered an error", H5PL_paths_g[u]);
 
         /* Break out if found */
         if (*found) {

test/filter_plugin.c

@@ -1524,6 +1524,12 @@ main(void)
         else
             my_fapl_id = old_ff_fapl_id;
 
+        /* Add extra path to check for correct error process */
+        if (H5PLprepend("bogus") < 0) {
+            fprintf(stderr, "Could not prepend path:bogus\n");
+            TEST_ERROR;
+        }
+
         /* Reopen the file for testing data reading */
         if ((fid = H5Fopen(filename, H5F_ACC_RDONLY, my_fapl_id)) < 0)
             TEST_ERROR;