From: Thomas Huth <thuth@redhat.com>

The tracetool tests currently fail if the host installation does not
have a "python3" binary (and you compiled QEMU by selecting a different
one during the "configure" step). This happens because tracetool-test.py
executes scripts/tracetool.py directly, so that this script is run via
its shebang line. To fix the issue, use the same Python interpreter to
run scripts/tracetool.py as we are using to run the tracetool-test.py
script.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 v2: Use sys.executable instead of passing the Python interpreter around
     via a PYTHON environment variable.

 tests/tracetool/tracetool-test.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tests/tracetool/tracetool-test.py b/tests/tracetool/tracetool-test.py
index 30006a99190..59e9ab3d6ef 100755
--- a/tests/tracetool/tracetool-test.py
+++ b/tests/tracetool/tracetool-test.py
@@ -36,7 +36,8 @@ def test_tracetool_one(tracetool, backend, fmt, src_dir, build_dir):
     actual_file = Path(build_dir, rel_filename)
     expect_file = Path(src_dir, rel_filename)
 
-    args = [tracetool, f"--format={fmt}", f"--backends={backend}", "--group=testsuite"]
+    args = [sys.executable, tracetool,
+            f"--format={fmt}", f"--backends={backend}", "--group=testsuite"]
 
     if fmt.find("stap") != -1:
         args += ["--binary=qemu", "--probe-prefix=qemu"]
-- 
2.52.0

On Thu, Jan 15, 2026 at 04:53:18PM +0100, Thomas Huth wrote:
> From: Thomas Huth <thuth@redhat.com>
> 
> The tracetool tests currently fail if the host installation does not
> have a "python3" binary (and you compiled QEMU by selecting a different
> one during the "configure" step). This happens because tracetool-test.py
> executes scripts/tracetool.py directly, so that this script is run via
> its shebang line. To fix the issue, use the same Python interpreter to
> run scripts/tracetool.py as we are using to run the tracetool-test.py
> script.
> 
> Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
> Signed-off-by: Thomas Huth <thuth@redhat.com>
> ---
>  v2: Use sys.executable instead of passing the Python interpreter around
>      via a PYTHON environment variable.
> 
>  tests/tracetool/tracetool-test.py | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Thanks, applied to my tracing tree:
https://gitlab.com/stefanha/qemu/commits/tracing

Stefan

On Thu, Jan 15, 2026 at 04:53:18PM +0100, Thomas Huth wrote:
> From: Thomas Huth <thuth@redhat.com>
> 
> The tracetool tests currently fail if the host installation does not
> have a "python3" binary (and you compiled QEMU by selecting a different
> one during the "configure" step). This happens because tracetool-test.py
> executes scripts/tracetool.py directly, so that this script is run via
> its shebang line. To fix the issue, use the same Python interpreter to
> run scripts/tracetool.py as we are using to run the tracetool-test.py
> script.
> 
> Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
> Signed-off-by: Thomas Huth <thuth@redhat.com>
> ---
>  v2: Use sys.executable instead of passing the Python interpreter around
>      via a PYTHON environment variable.
> 
>  tests/tracetool/tracetool-test.py | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>


With regards,
Daniel
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