[Buildroot] [RFC] Python pyc compilation check

[Arnout Vandecappelle <arnout@mind.be>]

 This is just an RFC, but if it gets good review I guess you intend to squash it
with the other series?

 I'm basically OK with the concept of this patch, with a few remarks still below.

On 08-02-16 22:51, Yegor Yefremov wrote:
> As promised Samuel's patch:
> 
> diff --git a/package/python/python.mk b/package/python/python.mk
> index 5ef3589..1d131c0 100644
> --- a/package/python/python.mk
> +++ b/package/python/python.mk
> @@ -220,8 +220,9 @@ $(eval $(host-autotools-package))
> 
>  define PYTHON_CREATE_PYC_FILES
>   PYTHONPATH="$(PYTHON_PATH)" \
> - $(HOST_DIR)/usr/bin/python$(PYTHON_VERSION_MAJOR) -c "import compileall; \
> - compileall.compile_dir('$(TARGET_DIR)/usr/lib/python$(PYTHON_VERSION_MAJOR)')"
> + $(HOST_DIR)/usr/bin/python$(PYTHON_VERSION_MAJOR) \

 You should add indentation here.

> + $(TOPDIR)/support/scripts/pycompile.py \

 $(TOPDIR) isn't needed, it is always executed from the top directory.

> + "$(TARGET_DIR)/usr/lib/python$(PYTHON_VERSION_MAJOR)"
>  endef
> 
>  ifeq ($(BR2_PACKAGE_PYTHON_PYC_ONLY),y)
> diff --git a/package/python3/python3.mk b/package/python3/python3.mk
> index 507c610..1eb356b 100644
> --- a/package/python3/python3.mk
> +++ b/package/python3/python3.mk
> @@ -217,8 +217,9 @@ $(eval $(host-autotools-package))
> 
>  define PYTHON3_CREATE_PYC_FILES
>   PYTHONPATH="$(PYTHON3_PATH)" \
> - $(HOST_DIR)/usr/bin/python$(PYTHON3_VERSION_MAJOR) -c "import compileall; \
> - compileall.compile_dir('$(TARGET_DIR)/usr/lib/python$(PYTHON3_VERSION_MAJOR)')"
> + $(HOST_DIR)/usr/bin/python$(PYTHON3_VERSION_MAJOR) \
> + $(TOPDIR)/support/scripts/pycompile.py \
> + "$(TARGET_DIR)/usr/lib/python$(PYTHON3_VERSION_MAJOR)"

 Same same.

>  endef
> 
>  ifeq ($(BR2_PACKAGE_PYTHON3_PYC_ONLY),y)
> diff --git a/support/scripts/pycompile.py b/support/scripts/pycompile.py
> new file mode 100755
> index 0000000..fde711a
> --- /dev/null
> +++ b/support/scripts/pycompile.py
> @@ -0,0 +1,24 @@
> +#!/usr/bin/env python
> +
> +# Wrapper for python2 and python3 around compileall to raise exception
> +# when a python byte code generation failed.
> +#
> +# Inspired from:
> +#   http://stackoverflow.com/questions/615632/how-to-detect-errors-from-compileall-compile-dir
> +
> +from __future__ import print_function
> +import sys
> +import py_compile
> +import compileall
> +
> +class ReportProblem:
> +    def __nonzero__(self):

 This could really use some comment to explain why it needs to be a class with a
__nonzero__ member.

 Regards,
 Arnout

> +        type, value, traceback = sys.exc_info()
> +        if type is not None and issubclass(type, py_compile.PyCompileError):
> +            print("Cannot compile %s" %value.file)
> +            raise value
> +        return 1
> +
> +report_problem = ReportProblem()
> +
> +compileall.compile_dir(sys.argv[1], quiet=report_problem)
> 
> Yegor
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-- 
Arnout Vandecappelle                          arnout at mind be
Senior Embedded Software Architect            +32-16-286500
Essensium/Mind                                http://www.mind.be
G.Geenslaan 9, 3001 Leuven, Belgium           BE 872 984 063 RPR Leuven
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