[Buildroot] [PATCH] core/pkg-generic: only save latest package list

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

John, All,

On 2018-04-29 14:07 +0100, John Keeping spake thusly:
> When rebuilding a package, simply appending the package's file list to
> the global list means that the package list grows for every rebuild, as
> does the time taken to check for files installed by multiple packages.
> Furthermore, we get false positives where a file is reported as being
> installed by multiple copies of the same package.
> 
> With this approach we may end up with orphaned files in the target
> filesystem if a package that has been updated and rebuilt no longer
> installs the same set of files, but we know that only a clean build will
> produce reliable results.  In fact it may be helpful to identify these
> orphaned files as evidence that the build is not clean.
> 
> Signed-off-by: John Keeping <john@metanate.com>
> ---
>  package/pkg-generic.mk | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/package/pkg-generic.mk b/package/pkg-generic.mk
> index 1c9dd1d734..edc2c9349c 100644
> --- a/package/pkg-generic.mk
> +++ b/package/pkg-generic.mk
> @@ -64,6 +64,7 @@ GLOBAL_INSTRUMENTATION_HOOKS += step_time
>  # $(3): suffix of file  (optional)
>  define step_pkg_size_inner
>  	cd $(2); \
> +	$(SED) '/^$(1),/d' $(BUILD_DIR)/packages-file-list$(3).txt; \

Since BUILD_DIR is a fully-qualified path, I would have put it as the
first line of the macros, and thus it would not have required the
trailing '\':

    $(SED) '/^$(1),/d' $(BUILD_DIR)/packages-file-list$(3).txt
    cd $(2); \
    find [...]

Otherwise:

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

Regards,
Yann E. MORIN.

>  	find . \( -type f -o -type l \) \
>  		-newer $($(PKG)_DIR)/.stamp_built \
>  		-exec printf '$(1),%s\n' {} + \
> -- 
> 2.17.0
> 

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