iotests: register each I/O test separately with meson

Currently meson registers a single test that invokes an entire group of
I/O tests, hiding the test granularity from meson. There are various
downsides of doing this

 * You cannot ask 'meson test' to invoke a single I/O test
 * The meson test timeout can't be applied to the individual
   tests
 * Meson only gets a pass/fail for the overall I/O test group
   not individual tests
 * If a CI job gets killed by the GitLab timeout, we don't
   get visibility into how far through the I/O tests
   execution got.

This switches meson to perform test discovery by invoking 'check' in
dry-run mode. It then registers one meson test case for each I/O
test. Parallel execution remains disabled since the I/O tests do not
use self contained execution environments and thus conflict with
each other.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Acked-by: Hanna Czenczek <hreitz@redhat.com>
Tested-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20230303160727.3977246-8-berrange@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230315174331.2959-25-alex.bennee@linaro.org>

tests/qemu-iotests/meson.build

@@ -32,16 +32,39 @@ foreach k, v : emulators
   endif
 endforeach
 
+qemu_iotests_check_cmd = files('check')
+
 foreach format, speed: qemu_iotests_formats
   if speed == 'quick'
     suites = 'block'
   else
     suites = ['block-' + speed, speed]
   endif
-  test('qemu-iotests ' + format, sh, args: [files('../check-block.sh'), format],
-       depends: qemu_iotests_binaries, env: qemu_iotests_env,
-       protocol: 'tap',
-       suite: suites,
-       timeout: 0,
-       is_parallel: false)
+
+  args = ['-tap', '-' + format]
+  if speed == 'quick'
+      args += ['-g', 'auto']
+  endif
+
+  rc = run_command(
+      [qemu_iotests_check_cmd] + args + ['-n'],
+      check: true,
+  )
+
+  foreach item: rc.stdout().strip().split()
+      args = ['-tap', '-' + format, item,
+              '--source-dir', meson.current_source_dir(),
+              '--build-dir', meson.current_build_dir()]
+      # Some individual tests take as long as 45 seconds
+      # Bump the timeout to 3 minutes for some headroom
+      # on slow machines to minimize spurious failures
+      test('io-' + format + '-' + item,
+           qemu_iotests_check_cmd,
+           args: args,
+           depends: qemu_iotests_binaries,
+           env: qemu_iotests_env,
+           protocol: 'tap',
+           timeout: 180,
+           suite: suites)
+  endforeach
 endforeach