image_types: Fix reproducible builds for initramfs and UKI img

I've encountered issues reproducing initramfs and UKI image builds,
which will be fixed with this patch.

1. initramfs
There's a symbolic link to /sbin/init, which is appended to the cpio archive after creation.
The links timestamp needs to be static and the cpio append command needs the '--reproducible' flag to produce deterministic outcomes.

2. Unified Kernel Image
'--preserve-dates' is required for a static 'Time/Date' entry.
I've added '--enable-deterministic-archives' although in my case this
didn't change anything.

(From OE-Core rev: fd027729bafb4e085ba0949e38e724f3a8cad102)

Signed-off-by: Frieder Paape <frieder@konvera.io>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 5 insertions, 2 deletions

diff --git a/meta/classes-recipe/image_types.bbclass b/meta/classes-recipe/image_types.bbclass
index bbddfaf272..023eb87537 100644
--- a/meta/classes-recipe/image_types.bbclass
+++ b/meta/classes-recipe/image_types.bbclass
@@ -148,10 +148,11 @@ IMAGE_CMD:cpio () {
                 if [ ! -L ${IMAGE_ROOTFS}/init ] && [ ! -e ${IMAGE_ROOTFS}/init ]; then
                         if [ -L ${IMAGE_ROOTFS}/sbin/init ] || [ -e ${IMAGE_ROOTFS}/sbin/init ]; then
                                 ln -sf /sbin/init ${WORKDIR}/cpio_append/init
+                                touch -h -r ${IMAGE_ROOTFS}/sbin/init ${WORKDIR}/cpio_append/init
                         else
-                                touch ${WORKDIR}/cpio_append/init
+                                touch -r ${IMAGE_ROOTFS} ${WORKDIR}/cpio_append/init
                         fi
-                        (cd  ${WORKDIR}/cpio_append && echo ./init | cpio -oA -H newc -F ${IMGDEPLOYDIR}/${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.cpio)
+                        (cd  ${WORKDIR}/cpio_append && echo ./init | cpio --reproducible -oA -H newc -F ${IMGDEPLOYDIR}/${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.cpio)
                 fi
         fi
 }
diff --git a/scripts/lib/wic/plugins/source/bootimg-efi.py b/scripts/lib/wic/plugins/source/bootimg-efi.py
index 43c6fd94d9..2bf7375887 100644
--- a/scripts/lib/wic/plugins/source/bootimg-efi.py
+++ b/scripts/lib/wic/plugins/source/bootimg-efi.py
@@ -351,6 +351,8 @@ class BootimgEFIPlugin(SourcePlugin):
 
                 # https://www.freedesktop.org/software/systemd/man/systemd-stub.html
                 objcopy_cmd = "%s-objcopy" % target_sys
+                objcopy_cmd += " --enable-deterministic-archives"
+                objcopy_cmd += " --preserve-dates"
                 objcopy_cmd += " --add-section .osrel=%s/usr/lib/os-release" % staging_dir_host
                 objcopy_cmd += " --change-section-vma .osrel=0x20000"
                 objcopy_cmd += " --add-section .cmdline=%s" % cmdline.name