[PATCH v2] rootfs: clean package log files that are not owned by packages

[venkata.pyla@toshiba-tsip.com]

From: venkata pyla <venkata.pyla@toshiba-tsip.com>

 /var/log/* files that are created during build stage and not owned
 by any package are not neccessary to be present in rootfs image, as
 these log files adds additional size to rootfs image, and also it
 create problems for reproducible build functionality.

 so this ROOTFS feature 'clean-log-files' should help to clean the log
 files when it is enalbed, disable it if we need the log files for
 debugging purpose.

 ROOTFS_FEATURE += clean-log-files

Signed-off-by: venkata pyla <venkata.pyla@toshiba-tsip.com>
---
 meta/classes/rootfs.bbclass | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/meta/classes/rootfs.bbclass b/meta/classes/rootfs.bbclass
index f9151c5..ff0ecad 100644
--- a/meta/classes/rootfs.bbclass
+++ b/meta/classes/rootfs.bbclass
@@ -12,6 +12,7 @@ ROOTFS_PACKAGES ?= ""
 # 'clean-package-cache' - delete package cache from rootfs
 # 'generate-manifest' - generate a package manifest of the rootfs into ${ROOTFS_MANIFEST_DEPLOY_DIR}
 # 'export-dpkg-status' - exports /var/lib/dpkg/status file to ${ROOTFS_DPKGSTATUS_DEPLOY_DIR}
+# 'clean-log-files' - delete log files that are not owned by packages
 ROOTFS_FEATURES ?= ""
 
 ROOTFS_APT_ARGS="install --yes -o Debug::pkgProblemResolver=yes"
@@ -213,6 +214,15 @@ rootfs_postprocess_clean_package_cache() {
     sudo rm -rf "${ROOTFSDIR}/var/lib/apt/lists/"*
 }
 
+ROOTFS_POSTPROCESS_COMMAND += "${@bb.utils.contains('ROOTFS_FEATURES', 'clean-log-files', 'rootfs_postprocess_clean_log_files', '', d)}"
+rootfs_postprocess_clean_log_files() {
+    # Delete log files that are not owned by packages
+    sudo -E chroot '${ROOTFSDIR}' \
+        /usr/bin/find /var/log/ \
+        -exec sh -c '! dpkg -S {} > /dev/null 2>&1' ';' \
+        -exec rm -rf {} ';'
+}
+
 ROOTFS_POSTPROCESS_COMMAND += "${@bb.utils.contains('ROOTFS_FEATURES', 'generate-manifest', 'rootfs_generate_manifest', '', d)}"
 rootfs_generate_manifest () {
     mkdir -p ${ROOTFS_MANIFEST_DEPLOY_DIR}
-- 
2.20.1