[Buildroot] [PATCH v4 2015.08 1/4] pkg-generic: add step_pkg_size global instrumentation hook

Ryan Barnett ryanbarnett3 at gmail.com
Thu May 28 03:29:27 UTC 2015


Thomas,

On Mon, May 25, 2015 at 4:56 PM, Thomas Petazzoni
<thomas.petazzoni at free-electrons.com> wrote:
> This patch adds a global instrumentation hook that collects the list
> of files installed in $(TARGET_DIR) by each package, and stores this
> list into a file called $(BUILD_DIR)/packages-file-list.txt. It can
> later be used to determine the size contribution of each package to
> the target root filesystem.
>
> Note that in order to detect if a file installed by one package is
> later overriden by another package, we calculate the md5 of installed
> files and compare them at each installation of a new package.
>
> This commit also adds a Config.in option to enable the collection of
> this data, as calculating the md5 of all installed files at the
> beginning and end of the installation of each package can be
> considered a time-consuming process which maybe some users will not be
> willing to suffer from.
>
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>

Reviewed-by: Ryan Barnett <ryanbarnett3 at gmail.com>
Test-by: Ryan Barnett <ryanbarnett3 at gmail.com>

> ---
>  package/pkg-generic.mk | 32 ++++++++++++++++++++++++++++++++
>  1 file changed, 32 insertions(+)
>
> diff --git a/package/pkg-generic.mk b/package/pkg-generic.mk
> index d5b29f0..944b0fc 100644
> --- a/package/pkg-generic.mk
> +++ b/package/pkg-generic.mk
> @@ -55,6 +55,38 @@ define step_time
>  endef
>  GLOBAL_INSTRUMENTATION_HOOKS += step_time
>
> +# Hooks to collect statistics about installed files
> +
> +# This hook will be called before the target installation of a
> +# package. We store in a file named .br_filelist_before the list of
> +# files currently installed in the target. Note that the MD5 is also
> +# stored, in order to identify if the files are overwritten.
> +define step_pkg_size_start
> +       (cd $(TARGET_DIR) ; find . -type f -print0 | xargs -0 md5sum) | sort > \
> +               $($(PKG)_DIR)/.br_filelist_before
> +endef
> +
> +# This hook will be called after the target installation of a
> +# package. We store in a file named .br_filelist_after the list of
> +# files (and their MD5) currently installed in the target. We then do
> +# a diff with the .br_filelist_before to compute the list of files
> +# installed by this package.
> +define step_pkg_size_end
> +       (cd $(TARGET_DIR); find . -type f -print0 | xargs -0 md5sum) | sort > \
> +               $($(PKG)_DIR)/.br_filelist_after
> +       comm -13 $($(PKG)_DIR)/.br_filelist_before $($(PKG)_DIR)/.br_filelist_after | \
> +               while read hash file ; do \
> +                       echo "$(1),$${file}" >> $(BUILD_DIR)/packages-file-list.txt ; \
> +               done
> +endef
> +
> +define step_pkg_size
> +       $(if $(filter install-target,$(2)),\
> +               $(if $(filter start,$(1)),$(call step_pkg_size_start,$(3))) \
> +               $(if $(filter end,$(1)),$(call step_pkg_size_end,$(3))))
> +endef
> +GLOBAL_INSTRUMENTATION_HOOKS += step_pkg_size
> +
>  # User-supplied script
>  ifneq ($(BR2_INSTRUMENTATION_SCRIPTS),)
>  define step_user


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