Re: [PATCH] kheaders: explicitly validate existence of cpio command

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On Tue, Jan 17, 2023 at 05:30:43AM +0000, Thomas Weißschuh wrote:
> If the cpio command is not available the error emitted by
> gen_kheaders.so is not clear as all output of the call to cpio is
> discarded:
> 
> GNU make 4.4:
> 
>   GEN     kernel/kheaders_data.tar.xz
> find: 'standard output': Broken pipe
> find: write error
> make[2]: *** [kernel/Makefile:157: kernel/kheaders_data.tar.xz] Error 127
> make[1]: *** [scripts/Makefile.build:504: kernel] Error 2
> 
> GNU make < 4.4:
> 
>   GEN     kernel/kheaders_data.tar.xz
> make[2]: *** [kernel/Makefile:157: kernel/kheaders_data.tar.xz] Error 127
> make[2]: *** Waiting for unfinished jobs....
> make[1]: *** [scripts/Makefile.build:504: kernel] Error 2
> 
> Add an explicit check that will trigger a clear message about the issue:
> 
>   CHK     kernel/kheaders_data.tar.xz
> ./kernel/gen_kheaders.sh: line 17: type: cpio: not found

Thanks for the patch!  What would you think about an even more verbose
message?  Perhaps something like:

    echo >&2 ' *** "cpio" is required for "CONFIG_IKHEADERS". >&2

Reviewed-by: Nicolas Schier <n.schier@xxxxxx>

Kind regards,
Nicolas

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