How do you debug sandbox when build fails but running the command passes

[Indra Gunawan]

To Bazel users,

I am trying to run shell command using ctx.actions.run_shell or ctx.action a python wrapper script like below:

    ctx.actions.run_shell(

        inputs=cython_gen_inputs,

        outputs=cython_gen_outputs,

        command=cython_gen_cmd,

        progress_message="Generating cython generated files",

        env={"LD_LIBRARY_PATH": python3_host_dir,

             "PYTHONHOME": python3_host_home,

             "PYTHONPATH": python3_host_lib,

             "CYTHON_ROOT": cython_root},

    )

building a target above with --sandbox_debug --verbose_failures flags.

https://blog.bazel.build/2016/03/18/sandbox-easier-debug.html

The build fails but if I copy and paste the command reported as failure it works.  The return status is 0 while the build by bazel returns 1.

What else can I do further to debug the error?

Thank you

[Marcel Hlopko]

Are you running everything including parens and that passes, and when bazel runs it it doesn't? Can you assemble a repro?

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[Austin Schuh]

This sounds like something is not available when running in the sandbox that is required.

As another trick in your bag of tricks, I've also added strace to the command invocation from bazel and diffed the output.  That lets me see what each invocation is doing differently in it's interactions with the OS, and pinpoint when the flow of execution diverges.

Austin

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