image_types.bbclass: Populate cpio /init as symlink

For cpio/ramfs the kernel will first attempt to execute /init and will
emit the following error as the file is empty:

    Failed to execute /init (error -13)

If /sbin/init exists symlink to it so the kernel can immediately start
the correct init executable instead of an empty file.

(From OE-Core rev: 3505558e067fdde4ab7aaaf3c50886f292d7c166)

(From OE-Core rev: 40bf6d0d71bd534fadcbc07b6fbba856e50bc534)

Signed-off-by: Nathan Rossi <nathan.rossi@xilinx.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/meta/classes/image_types.bbclass b/meta/classes/image_types.bbclass
index 6c3a89eefc..8e33214955 100644
--- a/meta/classes/image_types.bbclass
+++ b/meta/classes/image_types.bbclass
@@ -70,7 +70,11 @@ IMAGE_CMD_cpio () {
         (cd ${IMAGE_ROOTFS} && find . | cpio -o -H newc >${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.cpio)
         if [ ! -e ${IMAGE_ROOTFS}/init ]; then
                 mkdir -p ${WORKDIR}/cpio_append
-                touch ${WORKDIR}/cpio_append/init
+                if [ -e ${IMAGE_ROOTFS}/sbin/init -o -L ${IMAGE_ROOTFS}/sbin/init ]; then
+                        ln -sf /sbin/init ${WORKDIR}/cpio_append/init
+                else
+                        touch ${WORKDIR}/cpio_append/init
+                fi
                 (cd  ${WORKDIR}/cpio_append && echo ./init | cpio -oA -H newc -F ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.cpio)
         fi
 }