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pkg-generic: add step_pkg_size global instrumentation hook

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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.

Collecting the list of files installed by each package is done
unconditionally, as tests have shown that the performance impact of
doing this is negligible.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: Ryan Barnett <ryanbarnett3@gmail.com>
Tested-by: Ryan Barnett <ryanbarnett3@gmail.com>
Tested-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Thomas Petazzoni 2015-10-17 15:33:42 +02:00
parent e1e9c7daa9
commit 99aca138c2
1 changed files with 32 additions and 0 deletions
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32
package/pkg-generic.mk
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@ -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