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[PATCH v2 19/32] iotests: allow test discovery before building

From: Alex Bennée
Subject: [PATCH v2 19/32] iotests: allow test discovery before building
Date: Wed, 15 Mar 2023 17:43:18 +0000

From: Daniel P. Berrangé <berrange@redhat.com>

The 'check' script can be invoked in "dry run" mode, in which case it
merely does test discovery and prints out all their names. Despite only
doing test discovery it still validates that the various QEMU binaries
can be found. This makes it impossible todo test discovery prior to
building QEMU. This is a desirable feature to support, because it will
let meson discover tests.

Fortunately the code in the TestEnv constructor is ordered in a way
that makes this fairly trivial to achieve. We can just short circuit
the constructor after the basic directory paths have been set.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Acked-by: Hanna Czenczek <hreitz@redhat.com>
Tested-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20230303160727.3977246-3-berrange@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
 tests/qemu-iotests/check      | 3 ++-
 tests/qemu-iotests/testenv.py | 7 ++++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/tests/qemu-iotests/check b/tests/qemu-iotests/check
index da7e8a87fe..bb294ef556 100755
--- a/tests/qemu-iotests/check
+++ b/tests/qemu-iotests/check
@@ -145,7 +145,8 @@ if __name__ == '__main__':
                   aiomode=args.aiomode, cachemode=args.cachemode,
                   imgopts=args.imgopts, misalign=args.misalign,
                   debug=args.debug, valgrind=args.valgrind,
-                  gdb=args.gdb, qprint=args.print)
+                  gdb=args.gdb, qprint=args.print,
+                  dry_run=args.dry_run)
     if len(sys.argv) > 1 and sys.argv[-len(args.tests)-1] == '--':
         if not args.tests:
diff --git a/tests/qemu-iotests/testenv.py b/tests/qemu-iotests/testenv.py
index aa9d735414..9a37ad9152 100644
--- a/tests/qemu-iotests/testenv.py
+++ b/tests/qemu-iotests/testenv.py
@@ -178,7 +178,8 @@ def __init__(self, source_dir: str, build_dir: str,
                  debug: bool = False,
                  valgrind: bool = False,
                  gdb: bool = False,
-                 qprint: bool = False) -> None:
+                 qprint: bool = False,
+                 dry_run: bool = False) -> None:
         self.imgfmt = imgfmt
         self.imgproto = imgproto
         self.aiomode = aiomode
@@ -218,6 +219,10 @@ def __init__(self, source_dir: str, build_dir: str,
         self.build_root = os.path.join(self.build_iotests, '..', '..')
+        if dry_run:
+            return
         self.malloc_perturb_ = os.getenv('MALLOC_PERTURB_',

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