Enable run-time conditional test prerequisites.

Makefile.am

@@ -103,7 +103,9 @@ tests_CFLAGS = \
 tests_LDADD = $(top_builddir)/src/libguestfs.la
 
 TESTS = tests
-TESTS_ENVIRONMENT = $(VG)
+TESTS_ENVIRONMENT = \
+	SKIP_TEST_COMMAND=$(shell ldd test-command | grep -sq 'not a dynamic executable' || echo 1) \
+	$(VG)
 
 $(TESTS): $(INITRAMFS) $(VMLINUZ)
 

src/generator.ml

@@ -207,6 +207,12 @@ and test_prereq =
      * unimplemented feature.
      *)
   | Disabled
+    (* 'string' is some C code (a function body) that should return
+     * true or false.  The test will run if the code returns true.
+     *)
+  | If of string
+    (* As for 'If' but the test runs _unless_ the code returns true. *)
+  | Unless of string
 
 (* Some initial scenarios for testing. *)
 and test_init =
@@ -235,6 +241,11 @@ and test_init =
 and seq = cmd list
 and cmd = string list
 
+(* Canned test prerequisites. *)
+let env_is_true env =
+  sprintf "const char *str = getenv (\"%s\");
+  return str && strcmp (str, \"1\") == 0;" env
+
 (* Note about long descriptions: When referring to another
  * action, use the format C<guestfs_other> (ie. the full name of
  * the C function).  This will be replaced as appropriate in other
@@ -1180,51 +1191,51 @@ particular that the filename is not prepended to the output
 (the C<-b> option).");
 
   ("command", (RString "output", [StringList "arguments"]), 50, [ProtocolLimitWarning],
-   [InitBasicFS, Always, TestOutput (
+   [InitBasicFS, Unless (env_is_true "SKIP_TEST_COMMAND"), TestOutput (
       [["upload"; "test-command"; "/test-command"];
        ["chmod"; "493"; "/test-command"];
        ["command"; "/test-command 1"]], "Result1");
-    InitBasicFS, Always, TestOutput (
+    InitBasicFS, Unless (env_is_true "SKIP_TEST_COMMAND"), TestOutput (
       [["upload"; "test-command"; "/test-command"];
        ["chmod"; "493"; "/test-command"];
        ["command"; "/test-command 2"]], "Result2\n");
-    InitBasicFS, Always, TestOutput (
+    InitBasicFS, Unless (env_is_true "SKIP_TEST_COMMAND"), TestOutput (
       [["upload"; "test-command"; "/test-command"];
        ["chmod"; "493"; "/test-command"];
        ["command"; "/test-command 3"]], "\nResult3");
-    InitBasicFS, Always, TestOutput (
+    InitBasicFS, Unless (env_is_true "SKIP_TEST_COMMAND"), TestOutput (
       [["upload"; "test-command"; "/test-command"];
        ["chmod"; "493"; "/test-command"];
        ["command"; "/test-command 4"]], "\nResult4\n");
-    InitBasicFS, Always, TestOutput (
+    InitBasicFS, Unless (env_is_true "SKIP_TEST_COMMAND"), TestOutput (
       [["upload"; "test-command"; "/test-command"];
        ["chmod"; "493"; "/test-command"];
        ["command"; "/test-command 5"]], "\nResult5\n\n");
-    InitBasicFS, Always, TestOutput (
+    InitBasicFS, Unless (env_is_true "SKIP_TEST_COMMAND"), TestOutput (
       [["upload"; "test-command"; "/test-command"];
        ["chmod"; "493"; "/test-command"];
        ["command"; "/test-command 6"]], "\n\nResult6\n\n");
-    InitBasicFS, Always, TestOutput (
+    InitBasicFS, Unless (env_is_true "SKIP_TEST_COMMAND"), TestOutput (
       [["upload"; "test-command"; "/test-command"];
        ["chmod"; "493"; "/test-command"];
        ["command"; "/test-command 7"]], "");
-    InitBasicFS, Always, TestOutput (
+    InitBasicFS, Unless (env_is_true "SKIP_TEST_COMMAND"), TestOutput (
       [["upload"; "test-command"; "/test-command"];
        ["chmod"; "493"; "/test-command"];
        ["command"; "/test-command 8"]], "\n");
-    InitBasicFS, Always, TestOutput (
+    InitBasicFS, Unless (env_is_true "SKIP_TEST_COMMAND"), TestOutput (
       [["upload"; "test-command"; "/test-command"];
        ["chmod"; "493"; "/test-command"];
        ["command"; "/test-command 9"]], "\n\n");
-    InitBasicFS, Always, TestOutput (
+    InitBasicFS, Unless (env_is_true "SKIP_TEST_COMMAND"), TestOutput (
       [["upload"; "test-command"; "/test-command"];
        ["chmod"; "493"; "/test-command"];
        ["command"; "/test-command 10"]], "Result10-1\nResult10-2\n");
-    InitBasicFS, Always, TestOutput (
+    InitBasicFS, Unless (env_is_true "SKIP_TEST_COMMAND"), TestOutput (
       [["upload"; "test-command"; "/test-command"];
        ["chmod"; "493"; "/test-command"];
        ["command"; "/test-command 11"]], "Result11-1\nResult11-2");
-    InitBasicFS, Always, TestLastFail (
+    InitBasicFS, Unless (env_is_true "SKIP_TEST_COMMAND"), TestLastFail (
       [["upload"; "test-command"; "/test-command"];
        ["chmod"; "493"; "/test-command"];
        ["command"; "/test-command"]])],
@@ -1259,47 +1270,47 @@ all filesystems that are needed are mounted at the right
 locations.");
 
   ("command_lines", (RStringList "lines", [StringList "arguments"]), 51, [ProtocolLimitWarning],
-   [InitBasicFS, Always, TestOutputList (
+   [InitBasicFS, Unless (env_is_true "SKIP_TEST_COMMAND"), TestOutputList (
       [["upload"; "test-command"; "/test-command"];
        ["chmod"; "493"; "/test-command"];
        ["command_lines"; "/test-command 1"]], ["Result1"]);
-    InitBasicFS, Always, TestOutputList (
+    InitBasicFS, Unless (env_is_true "SKIP_TEST_COMMAND"), TestOutputList (
       [["upload"; "test-command"; "/test-command"];
        ["chmod"; "493"; "/test-command"];
        ["command_lines"; "/test-command 2"]], ["Result2"]);
-    InitBasicFS, Always, TestOutputList (
+    InitBasicFS, Unless (env_is_true "SKIP_TEST_COMMAND"), TestOutputList (
       [["upload"; "test-command"; "/test-command"];
        ["chmod"; "493"; "/test-command"];
        ["command_lines"; "/test-command 3"]], ["";"Result3"]);
-    InitBasicFS, Always, TestOutputList (
+    InitBasicFS, Unless (env_is_true "SKIP_TEST_COMMAND"), TestOutputList (
       [["upload"; "test-command"; "/test-command"];
        ["chmod"; "493"; "/test-command"];
        ["command_lines"; "/test-command 4"]], ["";"Result4"]);
-    InitBasicFS, Always, TestOutputList (
+    InitBasicFS, Unless (env_is_true "SKIP_TEST_COMMAND"), TestOutputList (
       [["upload"; "test-command"; "/test-command"];
        ["chmod"; "493"; "/test-command"];
        ["command_lines"; "/test-command 5"]], ["";"Result5";""]);
-    InitBasicFS, Always, TestOutputList (
+    InitBasicFS, Unless (env_is_true "SKIP_TEST_COMMAND"), TestOutputList (
       [["upload"; "test-command"; "/test-command"];
        ["chmod"; "493"; "/test-command"];
        ["command_lines"; "/test-command 6"]], ["";"";"Result6";""]);
-    InitBasicFS, Always, TestOutputList (
+    InitBasicFS, Unless (env_is_true "SKIP_TEST_COMMAND"), TestOutputList (
       [["upload"; "test-command"; "/test-command"];
        ["chmod"; "493"; "/test-command"];
        ["command_lines"; "/test-command 7"]], []);
-    InitBasicFS, Always, TestOutputList (
+    InitBasicFS, Unless (env_is_true "SKIP_TEST_COMMAND"), TestOutputList (
       [["upload"; "test-command"; "/test-command"];
        ["chmod"; "493"; "/test-command"];
        ["command_lines"; "/test-command 8"]], [""]);
-    InitBasicFS, Always, TestOutputList (
+    InitBasicFS, Unless (env_is_true "SKIP_TEST_COMMAND"), TestOutputList (
       [["upload"; "test-command"; "/test-command"];
        ["chmod"; "493"; "/test-command"];
        ["command_lines"; "/test-command 9"]], ["";""]);
-    InitBasicFS, Always, TestOutputList (
+    InitBasicFS, Unless (env_is_true "SKIP_TEST_COMMAND"), TestOutputList (
       [["upload"; "test-command"; "/test-command"];
        ["chmod"; "493"; "/test-command"];
        ["command_lines"; "/test-command 10"]], ["Result10-1";"Result10-2"]);
-    InitBasicFS, Always, TestOutputList (
+    InitBasicFS, Unless (env_is_true "SKIP_TEST_COMMAND"), TestOutputList (
       [["upload"; "test-command"; "/test-command"];
        ["chmod"; "493"; "/test-command"];
        ["command_lines"; "/test-command 11"]], ["Result11-1";"Result11-2"])],
@@ -3666,12 +3677,32 @@ int main (int argc, char *argv[])
 and generate_one_test name i (init, prereq, test) =
   let test_name = sprintf "test_%s_%d" name i in
 
+  (match prereq with
+   | Disabled | Always -> ()
+   | If code | Unless code ->
+       pr "static int %s_prereq (void)\n" test_name;
+       pr "{\n";
+       pr "  %s\n" code;
+       pr "}\n";
+       pr "\n";
+  );
+
   pr "static int %s (void)\n" test_name;
   pr "{\n";
 
   (match prereq with
    | Disabled ->
-       pr "  printf (\"%%s skipped (test disabled in generator)\\n\", \"%s\");\n" test_name
+       pr "  printf (\"%%s skipped (reason: test disabled in generator)\\n\", \"%s\");\n" test_name
+   | If _ ->
+       pr "  if (%s_prereq ()) {\n" test_name;
+       generate_one_test_body name i test_name init test;
+       pr "  } else\n";
+       pr "    printf (\"%%s skipped (reason: test prerequisite)\\n\", \"%s\");\n" test_name
+   | Unless _ ->
+       pr "  if (! %s_prereq ()) {\n" test_name;
+       generate_one_test_body name i test_name init test;
+       pr "  } else\n";
+       pr "    printf (\"%%s skipped (reason: test prerequisite)\\n\", \"%s\");\n" test_name
    | Always ->
        generate_one_test_body name i test_name init test
   );

tests.c

@@ -298,7 +298,7 @@ static int test_strings_e_0 (void)
 
 static int test_strings_e_1 (void)
 {
-  printf ("%s skipped (test disabled in generator)\n", "test_strings_e_1");
+  printf ("%s skipped (reason: test disabled in generator)\n", "test_strings_e_1");
   return 0;
 }
 
@@ -4981,8 +4981,15 @@ static int test_stat_0 (void)
   return 0;
 }
 
+static int test_command_lines_0_prereq (void)
+{
+  const char *str = getenv ("SKIP_TEST_COMMAND");
+  return str && strcmp (str, "1") == 0;
+}
+
 static int test_command_lines_0 (void)
 {
+  if (! test_command_lines_0_prereq ()) {
   /* InitBasicFS for command_lines (0): create ext2 on /dev/sda1 */
   {
     char device[] = "/dev/sda";
@@ -5093,11 +5100,20 @@ static int test_command_lines_0 (void)
       free (r[i]);
     free (r);
   }
+  } else
+    printf ("%s skippedd (reason: test prerequisite)\n", "test_command_lines_0");
   return 0;
 }
 
+static int test_command_lines_1_prereq (void)
+{
+  const char *str = getenv ("SKIP_TEST_COMMAND");
+  return str && strcmp (str, "1") == 0;
+}
+
 static int test_command_lines_1 (void)
 {
+  if (! test_command_lines_1_prereq ()) {
   /* InitBasicFS for command_lines (1): create ext2 on /dev/sda1 */
   {
     char device[] = "/dev/sda";
@@ -5208,11 +5224,20 @@ static int test_command_lines_1 (void)
       free (r[i]);
     free (r);
   }
+  } else
+    printf ("%s skippedd (reason: test prerequisite)\n", "test_command_lines_1");
   return 0;
 }
 
+static int test_command_lines_2_prereq (void)
+{
+  const char *str = getenv ("SKIP_TEST_COMMAND");
+  return str && strcmp (str, "1") == 0;
+}
+
 static int test_command_lines_2 (void)
 {
+  if (! test_command_lines_2_prereq ()) {
   /* InitBasicFS for command_lines (2): create ext2 on /dev/sda1 */
   {
     char device[] = "/dev/sda";
@@ -5335,11 +5360,20 @@ static int test_command_lines_2 (void)
       free (r[i]);
     free (r);
   }
+  } else
+    printf ("%s skippedd (reason: test prerequisite)\n", "test_command_lines_2");
   return 0;
 }
 
+static int test_command_lines_3_prereq (void)
+{
+  const char *str = getenv ("SKIP_TEST_COMMAND");
+  return str && strcmp (str, "1") == 0;
+}
+
 static int test_command_lines_3 (void)
 {
+  if (! test_command_lines_3_prereq ()) {
   /* InitBasicFS for command_lines (3): create ext2 on /dev/sda1 */
   {
     char device[] = "/dev/sda";
@@ -5462,11 +5496,20 @@ static int test_command_lines_3 (void)
       free (r[i]);
     free (r);
   }
+  } else
+    printf ("%s skippedd (reason: test prerequisite)\n", "test_command_lines_3");
   return 0;
 }
 
+static int test_command_lines_4_prereq (void)
+{
+  const char *str = getenv ("SKIP_TEST_COMMAND");
+  return str && strcmp (str, "1") == 0;
+}
+
 static int test_command_lines_4 (void)
 {
+  if (! test_command_lines_4_prereq ()) {
   /* InitBasicFS for command_lines (4): create ext2 on /dev/sda1 */
   {
     char device[] = "/dev/sda";
@@ -5601,11 +5644,20 @@ static int test_command_lines_4 (void)
       free (r[i]);
     free (r);
   }
+  } else
+    printf ("%s skippedd (reason: test prerequisite)\n", "test_command_lines_4");
   return 0;
 }
 
+static int test_command_lines_5_prereq (void)
+{
+  const char *str = getenv ("SKIP_TEST_COMMAND");
+  return str && strcmp (str, "1") == 0;
+}
+
 static int test_command_lines_5 (void)
 {
+  if (! test_command_lines_5_prereq ()) {
   /* InitBasicFS for command_lines (5): create ext2 on /dev/sda1 */
   {
     char device[] = "/dev/sda";
@@ -5752,11 +5804,20 @@ static int test_command_lines_5 (void)
       free (r[i]);
     free (r);
   }
+  } else
+    printf ("%s skippedd (reason: test prerequisite)\n", "test_command_lines_5");
   return 0;
 }
 
+static int test_command_lines_6_prereq (void)
+{
+  const char *str = getenv ("SKIP_TEST_COMMAND");
+  return str && strcmp (str, "1") == 0;
+}
+
 static int test_command_lines_6 (void)
 {
+  if (! test_command_lines_6_prereq ()) {
   /* InitBasicFS for command_lines (6): create ext2 on /dev/sda1 */
   {
     char device[] = "/dev/sda";
@@ -5855,11 +5916,20 @@ static int test_command_lines_6 (void)
       free (r[i]);
     free (r);
   }
+  } else
+    printf ("%s skippedd (reason: test prerequisite)\n", "test_command_lines_6");
   return 0;
 }
 
+static int test_command_lines_7_prereq (void)
+{
+  const char *str = getenv ("SKIP_TEST_COMMAND");
+  return str && strcmp (str, "1") == 0;
+}
+
 static int test_command_lines_7 (void)
 {
+  if (! test_command_lines_7_prereq ()) {
   /* InitBasicFS for command_lines (7): create ext2 on /dev/sda1 */
   {
     char device[] = "/dev/sda";
@@ -5970,11 +6040,20 @@ static int test_command_lines_7 (void)
       free (r[i]);
     free (r);
   }
+  } else
+    printf ("%s skippedd (reason: test prerequisite)\n", "test_command_lines_7");
   return 0;
 }
 
+static int test_command_lines_8_prereq (void)
+{
+  const char *str = getenv ("SKIP_TEST_COMMAND");
+  return str && strcmp (str, "1") == 0;
+}
+
 static int test_command_lines_8 (void)
 {
+  if (! test_command_lines_8_prereq ()) {
   /* InitBasicFS for command_lines (8): create ext2 on /dev/sda1 */
   {
     char device[] = "/dev/sda";
@@ -6097,11 +6176,20 @@ static int test_command_lines_8 (void)
       free (r[i]);
     free (r);
   }
+  } else
+    printf ("%s skippedd (reason: test prerequisite)\n", "test_command_lines_8");
   return 0;
 }
 
+static int test_command_lines_9_prereq (void)
+{
+  const char *str = getenv ("SKIP_TEST_COMMAND");
+  return str && strcmp (str, "1") == 0;
+}
+
 static int test_command_lines_9 (void)
 {
+  if (! test_command_lines_9_prereq ()) {
   /* InitBasicFS for command_lines (9): create ext2 on /dev/sda1 */
   {
     char device[] = "/dev/sda";
@@ -6224,11 +6312,20 @@ static int test_command_lines_9 (void)
       free (r[i]);
     free (r);
   }
+  } else
+    printf ("%s skippedd (reason: test prerequisite)\n", "test_command_lines_9");
   return 0;
 }
 
+static int test_command_lines_10_prereq (void)
+{
+  const char *str = getenv ("SKIP_TEST_COMMAND");
+  return str && strcmp (str, "1") == 0;
+}
+
 static int test_command_lines_10 (void)
 {
+  if (! test_command_lines_10_prereq ()) {
   /* InitBasicFS for command_lines (10): create ext2 on /dev/sda1 */
   {
     char device[] = "/dev/sda";
@@ -6351,11 +6448,20 @@ static int test_command_lines_10 (void)
       free (r[i]);
     free (r);
   }
+  } else
+    printf ("%s skippedd (reason: test prerequisite)\n", "test_command_lines_10");
   return 0;
 }
 
+static int test_command_0_prereq (void)
+{
+  const char *str = getenv ("SKIP_TEST_COMMAND");
+  return str && strcmp (str, "1") == 0;
+}
+
 static int test_command_0 (void)
 {
+  if (! test_command_0_prereq ()) {
   /* InitBasicFS for command (0): create ext2 on /dev/sda1 */
   {
     char device[] = "/dev/sda";
@@ -6451,11 +6557,20 @@ static int test_command_0 (void)
     }
     free (r);
   }
+  } else
+    printf ("%s skippedd (reason: test prerequisite)\n", "test_command_0");
   return 0;
 }
 
+static int test_command_1_prereq (void)
+{
+  const char *str = getenv ("SKIP_TEST_COMMAND");
+  return str && strcmp (str, "1") == 0;
+}
+
 static int test_command_1 (void)
 {
+  if (! test_command_1_prereq ()) {
   /* InitBasicFS for command (1): create ext2 on /dev/sda1 */
   {
     char device[] = "/dev/sda";
@@ -6551,11 +6666,20 @@ static int test_command_1 (void)
     }
     free (r);
   }
+  } else
+    printf ("%s skippedd (reason: test prerequisite)\n", "test_command_1");
   return 0;
 }
 
+static int test_command_2_prereq (void)
+{
+  const char *str = getenv ("SKIP_TEST_COMMAND");
+  return str && strcmp (str, "1") == 0;
+}
+
 static int test_command_2 (void)
 {
+  if (! test_command_2_prereq ()) {
   /* InitBasicFS for command (2): create ext2 on /dev/sda1 */
   {
     char device[] = "/dev/sda";
@@ -6651,11 +6775,20 @@ static int test_command_2 (void)
     }
     free (r);
   }
+  } else
+    printf ("%s skippedd (reason: test prerequisite)\n", "test_command_2");
   return 0;
 }
 
+static int test_command_3_prereq (void)
+{
+  const char *str = getenv ("SKIP_TEST_COMMAND");
+  return str && strcmp (str, "1") == 0;
+}
+
 static int test_command_3 (void)
 {
+  if (! test_command_3_prereq ()) {
   /* InitBasicFS for command (3): create ext2 on /dev/sda1 */
   {
     char device[] = "/dev/sda";
@@ -6751,11 +6884,20 @@ static int test_command_3 (void)
     }
     free (r);
   }
+  } else
+    printf ("%s skippedd (reason: test prerequisite)\n", "test_command_3");
   return 0;
 }
 
+static int test_command_4_prereq (void)
+{
+  const char *str = getenv ("SKIP_TEST_COMMAND");
+  return str && strcmp (str, "1") == 0;
+}
+
 static int test_command_4 (void)
 {
+  if (! test_command_4_prereq ()) {
   /* InitBasicFS for command (4): create ext2 on /dev/sda1 */
   {
     char device[] = "/dev/sda";
@@ -6851,11 +6993,20 @@ static int test_command_4 (void)
     }
     free (r);
   }
+  } else
+    printf ("%s skippedd (reason: test prerequisite)\n", "test_command_4");
   return 0;
 }
 
+static int test_command_5_prereq (void)
+{
+  const char *str = getenv ("SKIP_TEST_COMMAND");
+  return str && strcmp (str, "1") == 0;
+}
+
 static int test_command_5 (void)
 {
+  if (! test_command_5_prereq ()) {
   /* InitBasicFS for command (5): create ext2 on /dev/sda1 */
   {
     char device[] = "/dev/sda";
@@ -6951,11 +7102,20 @@ static int test_command_5 (void)
     }
     free (r);
   }
+  } else
+    printf ("%s skippedd (reason: test prerequisite)\n", "test_command_5");
   return 0;
 }
 
+static int test_command_6_prereq (void)
+{
+  const char *str = getenv ("SKIP_TEST_COMMAND");
+  return str && strcmp (str, "1") == 0;
+}
+
 static int test_command_6 (void)
 {
+  if (! test_command_6_prereq ()) {
   /* InitBasicFS for command (6): create ext2 on /dev/sda1 */
   {
     char device[] = "/dev/sda";
@@ -7051,11 +7211,20 @@ static int test_command_6 (void)
     }
     free (r);
   }
+  } else
+    printf ("%s skippedd (reason: test prerequisite)\n", "test_command_6");
   return 0;
 }
 
+static int test_command_7_prereq (void)
+{
+  const char *str = getenv ("SKIP_TEST_COMMAND");
+  return str && strcmp (str, "1") == 0;
+}
+
 static int test_command_7 (void)
 {
+  if (! test_command_7_prereq ()) {
   /* InitBasicFS for command (7): create ext2 on /dev/sda1 */
   {
     char device[] = "/dev/sda";
@@ -7151,11 +7320,20 @@ static int test_command_7 (void)
     }
     free (r);
   }
+  } else
+    printf ("%s skippedd (reason: test prerequisite)\n", "test_command_7");
   return 0;
 }
 
+static int test_command_8_prereq (void)
+{
+  const char *str = getenv ("SKIP_TEST_COMMAND");
+  return str && strcmp (str, "1") == 0;
+}
+
 static int test_command_8 (void)
 {
+  if (! test_command_8_prereq ()) {
   /* InitBasicFS for command (8): create ext2 on /dev/sda1 */
   {
     char device[] = "/dev/sda";
@@ -7251,11 +7429,20 @@ static int test_command_8 (void)
     }
     free (r);
   }
+  } else
+    printf ("%s skippedd (reason: test prerequisite)\n", "test_command_8");
   return 0;
 }
 
+static int test_command_9_prereq (void)
+{
+  const char *str = getenv ("SKIP_TEST_COMMAND");
+  return str && strcmp (str, "1") == 0;
+}
+
 static int test_command_9 (void)
 {
+  if (! test_command_9_prereq ()) {
   /* InitBasicFS for command (9): create ext2 on /dev/sda1 */
   {
     char device[] = "/dev/sda";
@@ -7351,11 +7538,20 @@ static int test_command_9 (void)
     }
     free (r);
   }
+  } else
+    printf ("%s skippedd (reason: test prerequisite)\n", "test_command_9");
   return 0;
 }
 
+static int test_command_10_prereq (void)
+{
+  const char *str = getenv ("SKIP_TEST_COMMAND");
+  return str && strcmp (str, "1") == 0;
+}
+
 static int test_command_10 (void)
 {
+  if (! test_command_10_prereq ()) {
   /* InitBasicFS for command (10): create ext2 on /dev/sda1 */
   {
     char device[] = "/dev/sda";
@@ -7451,11 +7647,20 @@ static int test_command_10 (void)
     }
     free (r);
   }
+  } else
+    printf ("%s skippedd (reason: test prerequisite)\n", "test_command_10");
   return 0;
 }
 
+static int test_command_11_prereq (void)
+{
+  const char *str = getenv ("SKIP_TEST_COMMAND");
+  return str && strcmp (str, "1") == 0;
+}
+
 static int test_command_11 (void)
 {
+  if (! test_command_11_prereq ()) {
   /* InitBasicFS for command (11): create ext2 on /dev/sda1 */
   {
     char device[] = "/dev/sda";
@@ -7544,6 +7749,8 @@ static int test_command_11 (void)
       return -1;
     free (r);
   }
+  } else
+    printf ("%s skippedd (reason: test prerequisite)\n", "test_command_11");
   return 0;
 }