[Buildroot] [PATCH] support/scripts/check-bin-arch: ignore symbolic links

[Yann E. MORIN <yann.morin.1998@free.fr>]

Thomas, All,

On 2017-09-03 16:09 +0200, Thomas Petazzoni spake thusly:
> Since commit da32b49f0091ee9dfb613e0f00973bf6893bfa84
> ("instrumentation: extend packages-file-list.txt with symlinks and
> directories"), the packages-file-list.txt also contains symbolic
> links. Therefore, check-bin-arch is now also checking symbolic links.
> 
> However, symbolic links in $(TARGET_DIR) can have absolute path as
> targets, such as:
> 
> $ ls -l output/target/sbin/ifdown
> lrwxrwxrwx 1 thomas thomas 10 Sep  3 15:55 output/target/sbin/ifdown -> /sbin/ifup
> 
> Therefore, we are now potentially checking a host binary, which
> obviously makes check-bin-arch fail.
> 
> This commit changes check-bin-arch to ignore symbolic links. Indeed,
> we have two cases:
> 
>  - The symbolic link really points to something that will in the
>    rootfs (such as /sbin/ifup above). In this case, /sbin/ifup will be
>    checked separately by check-bin-arch.
> 
>  - The symbolic link doesn't point to something that will be in the
>    rootfs, and that is not a problem from the perspective of
>    check-bin-arch, which checks the architecture of target binaries.
> 
> Fixes:
> 
>   http://autobuild.buildroot.net/results/16d384a0183d477646ac7692feb65f00dde7d068/
>   (vim)
> 
>   http://autobuild.buildroot.net/results/50429c0f63a8befff9e20899327b9a8d754d99be/
>   (ifupdown)
> 
>   http://autobuild.buildroot.net/results/1db65973e782bfa61abcbccd3501bfd235f77288/
>   (gawk)
> 
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> ---
>  support/scripts/check-bin-arch | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/support/scripts/check-bin-arch b/support/scripts/check-bin-arch
> index b822cdd60d..700ee3f65e 100755
> --- a/support/scripts/check-bin-arch
> +++ b/support/scripts/check-bin-arch
> @@ -36,6 +36,12 @@ while read f; do
>  		continue
>  	fi
>  
> +	# Skip symlinks. Some symlinks may have absolute paths as
> +	# target, pointing to host binaries while we're building.
> +	if [[ -L "${f}" ]]; then

I don't like that we use the bashism [[...]] when the POSIX [...] works
perfectly well. And we also use 'test' below, which is not very
consistent...

But oh, well...

Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

Regards,
Yann E. MORIN.

> +		continue
> +	fi
> +
>  	# Get architecture using readelf. We pipe through 'head -1' so
>  	# that when the file is a static library (.a), we only take
>  	# into account the architecture of the first object file.
> -- 
> 2.13.5
> 

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