[Buildroot] [PATCHv6 1/4] pkg-generic: add step_pkg_size global instrumentation hook
Thomas Petazzoni
thomas.petazzoni at free-electrons.com
Sat Oct 17 13:33:42 UTC 2015
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 at free-electrons.com>
Reviewed-by: Ryan Barnett <ryanbarnett3 at gmail.com>
Tested-by: Ryan Barnett <ryanbarnett3 at gmail.com>
Tested-by: "Yann E. MORIN" <yann.morin.1998 at free.fr>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998 at free.fr>
---
package/pkg-generic.mk | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/package/pkg-generic.mk b/package/pkg-generic.mk
index 76ec295..ffef4d3 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
--
2.6.2
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