image-prelink.bbclass: support binary reproducibility

Conditionally support binary reproducibility in built images.
If BUILD_REPRODUCIBLE_BINARIES = 1 then:

1. Do not randomize library addresses
2. Set/export PRELINK_TIMESTAMP to a reproducible value.
   If REPRODUCIBLE_TIMESTAMP_ROOTFS is specified, then the value will
   be used. Otherwise the timestamp will be derived from the top git commit.

(From OE-Core rev: 40ce3db222f8557a01d041f8115d531cc90a54e8)

Signed-off-by: Juro Bystricky <juro.bystricky@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 11 insertions, 1 deletions

diff --git a/meta/classes/image-prelink.bbclass b/meta/classes/image-prelink.bbclass
index 6fcd699016..f3bb68b9e1 100644
--- a/meta/classes/image-prelink.bbclass
+++ b/meta/classes/image-prelink.bbclass
@@ -36,7 +36,17 @@ prelink_image () {
         dynamic_loader=$(linuxloader)
 
         # prelink!
-        ${STAGING_SBINDIR_NATIVE}/prelink --root ${IMAGE_ROOTFS} -amR -N -c ${sysconfdir}/prelink.conf --dynamic-linker $dynamic_loader
+        if [ "$BUILD_REPRODUCIBLE_BINARIES" = "1" ]; then
+                bbnote " prelink: BUILD_REPRODUCIBLE_BINARIES..."
+                if [ "$REPRODUCIBLE_TIMESTAMP_ROOTFS" = "" ]; then
+                        export PRELINK_TIMESTAMP=`git log -1 --pretty=%ct `
+                else
+                        export PRELINK_TIMESTAMP=$REPRODUCIBLE_TIMESTAMP_ROOTFS
+                fi
+                ${STAGING_SBINDIR_NATIVE}/prelink --root ${IMAGE_ROOTFS} -am -N -c ${sysconfdir}/prelink.conf --dynamic-linker $dynamic_loader
+        else
+                ${STAGING_SBINDIR_NATIVE}/prelink --root ${IMAGE_ROOTFS} -amR -N -c ${sysconfdir}/prelink.conf --dynamic-linker $dynamic_loader
+        fi
 
         # Remove the prelink.conf if we had to add it.
         if [ "$dummy_prelink_conf" = "true" ]; then