[Libguestfs] [nbdkit PATCH 2/2] tests: Test nbd forwarder plugin

[Eric Blake]

I'd be remiss if I didn't enhance the testsuite to exercise the
nbd plugin (after all, the best way to make sure something doesn't
regress is to cover it in the testsuite).  Borrows heavily from
test-file, with the main difference being that I wrap three nbdkit
processes instead of one.

Signed-off-by: Eric Blake <eblake at redhat.com>
---
 .gitignore        |   1 +
 tests/Makefile.am |   8 ++++
 tests/test-nbd.c  | 119 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 128 insertions(+)
 create mode 100644 tests/test-nbd.c

diff --git a/.gitignore b/.gitignore
index 4baaaad..17b1688 100644
--- a/.gitignore
+++ b/.gitignore
@@ -49,6 +49,7 @@ Makefile.in
 /tests/test-file
 /tests/test-gzip
 /tests/test-newstyle
+/tests/test-nbd
 /tests/test-ocaml
 /tests/test-ocaml-plugin.so
 /tests/test-oldstyle
diff --git a/tests/Makefile.am b/tests/Makefile.am
index c5429cb..aefb0ca 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -210,6 +210,14 @@ test_file_SOURCES = test-file.c test.h
 test_file_CFLAGS = $(WARNINGS_CFLAGS) $(LIBGUESTFS_CFLAGS)
 test_file_LDADD = libtest.la $(LIBGUESTFS_LIBS)

+# nbd plugin test.
+check_PROGRAMS += test-nbd
+TESTS += test-nbd
+
+test_nbd_SOURCES = test-nbd.c test.h
+test_nbd_CFLAGS = $(WARNINGS_CFLAGS) $(LIBGUESTFS_CFLAGS)
+test_nbd_LDADD = libtest.la $(LIBGUESTFS_LIBS)
+
 # gzip plugin test.
 if HAVE_ZLIB
 if HAVE_GUESTFISH
diff --git a/tests/test-nbd.c b/tests/test-nbd.c
new file mode 100644
index 0000000..646c0c3
--- /dev/null
+++ b/tests/test-nbd.c
@@ -0,0 +1,119 @@
+/* nbdkit
+ * Copyright (C) 2017 Red Hat Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * * Neither the name of Red Hat nor the names of its contributors may be
+ * used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <guestfs.h>
+
+#include "test.h"
+
+int
+main (int argc, char *argv[])
+{
+  guestfs_h *g;
+  int r;
+  char *data;
+  char *sockarg = NULL;
+  size_t i, size;
+
+  /* If wrapping once is good, why not do it twice!  Shows that we can
+   * convert between either style of server options. */
+  if (test_start_nbdkit ("-o", "file", "file=file-data", NULL) == -1)
+    exit (EXIT_FAILURE);
+
+  if (asprintf (&sockarg, "socket=%s", sock) < 0) {
+    perror ("asprintf");
+    exit (EXIT_FAILURE);
+  }
+  if (test_start_nbdkit ("-e", "wrap", "nbd", sockarg, NULL) == -1)
+    exit (EXIT_FAILURE);
+  free (sockarg);
+
+  if (asprintf (&sockarg, "socket=%s", sock) < 0) {
+    perror ("asprintf");
+    exit (EXIT_FAILURE);
+  }
+  if (test_start_nbdkit ("-o", "nbd", sockarg, "export=wrap", NULL) == -1)
+    exit (EXIT_FAILURE);
+  free (sockarg);
+
+  g = guestfs_create ();
+  if (g == NULL) {
+    perror ("guestfs_create");
+    exit (EXIT_FAILURE);
+  }
+
+  r = guestfs_add_drive_opts (g, "",
+                              GUESTFS_ADD_DRIVE_OPTS_FORMAT, "raw",
+                              GUESTFS_ADD_DRIVE_OPTS_PROTOCOL, "nbd",
+                              GUESTFS_ADD_DRIVE_OPTS_SERVER, server,
+                              -1);
+  if (r == -1)
+    exit (EXIT_FAILURE);
+
+  if (guestfs_launch (g) == -1)
+    exit (EXIT_FAILURE);
+
+  /* Check the data in the file is \x01-\x08 repeated 512 times. */
+  data = guestfs_pread_device (g, "/dev/sda", 8 * 512, 0, &size);
+  if (!data)
+    exit (EXIT_FAILURE);
+  if (size != 8 * 512) {
+    fprintf (stderr, "%s FAILED: unexpected size (actual: %zu, expected: 512)\n",
+             program_name, size);
+    exit (EXIT_FAILURE);
+  }
+
+  for (i = 0; i < 512 * 8; i += 8) {
+    if (data[i] != 1 || data[i+1] != 2 ||
+        data[i+2] != 3 || data[i+3] != 4 ||
+        data[i+4] != 5 || data[i+5] != 6 ||
+        data[i+6] != 7 || data[i+7] != 8) {
+      fprintf (stderr, "%s FAILED: unexpected data returned at offset %zu\n",
+               program_name, i);
+      exit (EXIT_FAILURE);
+    }
+  }
+
+  free (data);
+
+  guestfs_close (g);
+  exit (EXIT_SUCCESS);
+}
-- 
2.13.6