generator: Allow individual tests to depend on daemon features.

Using IfAvailable "featurename" we allow individual tests to
only run if the feature is available in the daemon.

This will allow us to extend testing to a lot more optional
features such as NTFS.
(cherry picked from commit f9d08600c52dc0730e7dad8d9259b59e32aeece2)

diff --git a/src/generator.ml b/src/generator.ml
index 3c4c8b1..f32e064 100755 (executable)
--- a/src/generator.ml
+++ b/src/generator.ml
@@ -307,6 +307,9 @@ and test_prereq =
     (* As for 'If' but the test runs _unless_ the code returns true. *)
   | Unless of string
 
+    (* Run the test only if 'string' is available in the daemon. *)
+  | IfAvailable of string
+
 (* Some initial scenarios for testing. *)
 and test_init =
     (* Do nothing, block devices could contain random stuff including
@@ -6483,7 +6486,7 @@ is_available (const char *group)
     fun (_, _, _, _, tests, _, _) ->
       let tests = filter_map (
         function
-        | (_, (Always|If _|Unless _), test) -> Some test
+        | (_, (Always|If _|Unless _|IfAvailable _), test) -> Some test
         | (_, Disabled, _) -> None
       ) tests in
       let seq = List.concat (List.map seq_of_test tests) in
@@ -6689,7 +6692,7 @@ static int %s_skip (void)
 " test_name name (String.uppercase test_name) (String.uppercase name);
 
   (match prereq with
-   | Disabled | Always -> ()
+   | Disabled | Always | IfAvailable _ -> ()
    | If code | Unless code ->
        pr "static int %s_prereq (void)\n" test_name;
        pr "{\n";
@@ -6738,6 +6741,13 @@ static int %s (void)
        pr "  }\n";
        pr "\n";
        generate_one_test_body name i test_name init test;
+   | IfAvailable group ->
+       pr "  if (!is_available (\"%s\")) {\n" group;
+       pr "    printf (\"        %%s skipped (reason: %%s not available)\\n\", \"%s\", \"%s\");\n" test_name group;
+       pr "    return 0;\n";
+       pr "  }\n";
+       pr "\n";
+       generate_one_test_body name i test_name init test;
    | Always ->
        generate_one_test_body name i test_name init test
   );