linux-kernel - Re: [PATCH 1/2] Makefile: clang-tools: Print information when clang-tidy tool is missing

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Date:   Thu, 20 May 2021 16:56:39 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Maciej Falkowski <maciej.falkowski9@...il.com>
Cc:     Nathan Chancellor <natechancellor@...il.com>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Borislav Petkov <bp@...e.de>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Huckleberry <nhuck15@...il.com>
Subject: Re: [PATCH 1/2] Makefile: clang-tools: Print information when
 clang-tidy tool is missing

On Thu, May 20, 2021 at 4:18 PM Maciej Falkowski
<maciej.falkowski9@...il.com> wrote:
>
> When `clang-tidy` tool is missing in the system, the FileNotFoundError
> exception is raised in the program reporting a stack trace to the user:
>
> $ ./scripts/clang-tools/run-clang-tools.py clang-tidy ./compile_commands.json
> multiprocessing.pool.RemoteTraceback:
> """
> Traceback (most recent call last):
>   File "/usr/lib64/python3.8/multiprocessing/pool.py", line 125, in worker
>     result = (True, func(*args, **kwds))
>   File "/usr/lib64/python3.8/multiprocessing/pool.py", line 48, in mapstar
>     return list(map(*args))
>   File "./scripts/clang-tools/run-clang-tools.py", line 54, in run_analysis
>     p = subprocess.run(["clang-tidy", "-p", args.path, checks, entry["file"]],
>   File "/usr/lib64/python3.8/subprocess.py", line 489, in run
>     with Popen(*popenargs, **kwargs) as process:
>   File "/usr/lib64/python3.8/subprocess.py", line 854, in __init__
>     self._execute_child(args, executable, preexec_fn, close_fds,
>   File "/usr/lib64/python3.8/subprocess.py", line 1702, in _execute_child
>     raise child_exception_type(errno_num, err_msg, err_filename)
> FileNotFoundError: [Errno 2] No such file or directory: 'clang-tidy'
> """
>
> The above exception was the direct cause of the following exception:
>
> Traceback (most recent call last):
>   File "./scripts/clang-tools/run-clang-tools.py", line 74, in <module>
>     main()
>   File "./scripts/clang-tools/run-clang-tools.py", line 70, in main
>     pool.map(run_analysis, datastore)
>   File "/usr/lib64/python3.8/multiprocessing/pool.py", line 364, in map
>     return self._map_async(func, iterable, mapstar, chunksize).get()
>   File "/usr/lib64/python3.8/multiprocessing/pool.py", line 771, in get
>     raise self._value
> FileNotFoundError: [Errno 2] No such file or directory: 'clang-tidy'
>
> The patch adds more user-friendly information on the missing tool by
> catching FileNotFoundError for `clang-tidy` file and raising exception
> again for possible other files:
>
> $ ./scripts/clang-tools/run-clang-tools.py clang-tidy ./compile_commands.json
> Command `clang-tidy` is missing in the system.

This is much nicer when I run:
$ make LLVM=1 LLVM_IAS=1 -j72 clang-analyzer
without clang-tidy built or installed locally, thank you for the patch.

Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
Tested-by: Nick Desaulniers <ndesaulniers@...gle.com>

Please make sure to include the results from running
./scripts/get_maintainer.pl on your patch files for the CC list.

>
> Signed-off-by: Maciej Falkowski <maciej.falkowski9@...il.com>
> Link: https://github.com/ClangBuiltLinux/linux/issues/1342
> ---
>  scripts/clang-tools/run-clang-tools.py | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/scripts/clang-tools/run-clang-tools.py b/scripts/clang-tools/run-clang-tools.py
> index fa7655c7cec0..38fc311d2e03 100755
> --- a/scripts/clang-tools/run-clang-tools.py
> +++ b/scripts/clang-tools/run-clang-tools.py
> @@ -67,7 +67,13 @@ def main():
>      # Read JSON data into the datastore variable
>      with open(args.path, "r") as f:
>          datastore = json.load(f)
> -        pool.map(run_analysis, datastore)
> +        try:
> +            pool.map(run_analysis, datastore)
> +        except FileNotFoundError as not_found:
> +            if not_found.filename == 'clang-tidy':
> +                print('Command `clang-tidy` is missing in the system.')
> +            else:
> +                raise not_found
>
>
>  if __name__ == "__main__":
> --
> 2.26.3
>


-- 
Thanks,
~Nick Desaulniers