[PATCH 3/4] clean /tmp in rootfs postprocess

[Felix Moessbauer <felix.moessbauer@siemens.com>]

This patch cleans all files below /tmp to ensure the rootfs is
reproducible, independent if provided by the sstate cache or rebuild.
In general, /tmp has to be considered volatile across boots, so
always cleaning it is not harmful.

Signed-off-by: Felix Moessbauer <felix.moessbauer@siemens.com>
---
 meta/classes/rootfs.bbclass | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meta/classes/rootfs.bbclass b/meta/classes/rootfs.bbclass
index 870fcf2c..1c253616 100644
--- a/meta/classes/rootfs.bbclass
+++ b/meta/classes/rootfs.bbclass
@@ -267,6 +267,12 @@ rootfs_postprocess_clean_ldconfig_cache() {
     sudo rm -f ${ROOTFSDIR}/var/cache/ldconfig/aux-cache
 }
 
+ROOTFS_POSTPROCESS_COMMAND += "rootfs_postprocess_clean_tmp"
+rootfs_postprocess_clean_tmp() {
+    # /tmp is by definition non persistent across boots
+    sudo rm -rf "${ROOTFSDIR}/tmp/"*
+}
+
 ROOTFS_POSTPROCESS_COMMAND += "${@bb.utils.contains('ROOTFS_FEATURES', 'generate-manifest', 'rootfs_generate_manifest', '', d)}"
 rootfs_generate_manifest () {
     mkdir -p ${ROOTFS_MANIFEST_DEPLOY_DIR}
-- 
2.34.1