[OE-core] [RFC][PATCH 2/2] buildhistory: support generating md5sum of files

[Jacob Kroon]

Introduce 'md5' in BUILDHISTORY_FEATURES and enable it by default
when doing reproducible builds.

When enabled this will additionally create:

  files-in-package-md5.txt
  files-in-image-md5.txt
  files-in-sdk-md5.txt

containing the md5 checksums of regular files.

Signed-off-by: Jacob Kroon <jacob.kroon at gmail.com>
---
 meta/classes/buildhistory.bbclass | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/meta/classes/buildhistory.bbclass b/meta/classes/buildhistory.bbclass
index 33eb1b00f6..00f0701dec 100644
--- a/meta/classes/buildhistory.bbclass
+++ b/meta/classes/buildhistory.bbclass
@@ -7,7 +7,8 @@
 # Copyright (C) 2007-2011 Koen Kooi <koen at openembedded.org>
 #
 
-BUILDHISTORY_FEATURES ?= "image package sdk"
+BUILDHISTORY_FEATURES ?= "image package sdk \
+  ${@ "md5" if bb.utils.to_boolean(d.getVar('BUILD_REPRODUCIBLE_BINARIES')) else ""}"
 BUILDHISTORY_DIR ?= "${TOPDIR}/buildhistory"
 BUILDHISTORY_DIR_IMAGE = "${BUILDHISTORY_DIR}/images/${MACHINE_ARCH}/${TCLIBC}/${IMAGE_BASENAME}"
 BUILDHISTORY_DIR_PACKAGE = "${BUILDHISTORY_DIR}/packages/${MULTIMACH_TARGET_SYS}/${PN}"
@@ -526,7 +527,12 @@ buildhistory_list_files() {
 		eval ${FAKEROOTENV} ${FAKEROOTCMD} $find_cmd
 	else
 		eval $find_cmd
-	fi | sort -k5 | sed 's/ * -> $//' > $2 )
+	fi | sort -k5 | sed 's/ * -> $//' > $2
+	if [ "${@bb.utils.contains('BUILDHISTORY_FEATURES', 'md5', '1', '0', d)}" = "1" ] ; then
+		md5filename=$(echo $2 | sed 's/\.txt$/-md5.txt/')
+		find -type f | xargs -I{} -n1 md5sum {} | sort -k2 > $md5filename
+		[ -s $md5filename ] || rm $md5filename # remove result if empty
+	fi )
 }
 
 buildhistory_list_pkg_files() {
-- 
2.11.0