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cpio rootfs build: Avoid modifying rootfs dir 

The Linux kernel requires that initrd images contain a /init file for
the image to be used as an initrd, even if it is empty. Adding it into
the rootfs directory creates a race, that can upset tar when building
both a .tar and .cpio image file ("tar: .: file changed as we read it").
Additionally, whether or not the tar file will contain the /init file is
also up to the race condition.

To avoid this problem, move the /init addition out from the rootfs
directory, and thus only include it in the .cpio image.

(From OE-Core rev: 706055503f493a5af73240c0983c46dbe31d8fe9)

Signed-off-by: Jonas Eriksson <jonas.eriksson@enea.com>
Signed-off-by: Josep Puigdemont <josep.puigdemont@enea.com>
Cc: Laurentiu Palcu <laurentiu.palcu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Jonas Eriksson 2014-03-24 16:56:05 +01:00 committed by Richard Purdie
parent 0ba78399f4
commit cdf0d9715e
1 changed files with 5 additions and 3 deletions
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8
meta/classes/image_types.bbclass
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@ -66,10 +66,12 @@ IMAGE_CMD_squashfs-xz = "mksquashfs ${IMAGE_ROOTFS} ${DEPLOY_DIR_IMAGE}/${IMAGE_
IMAGE_CMD_tar = "tar -cvf ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.tar -C ${IMAGE_ROOTFS} ."
IMAGE_CMD_cpio () {
if [ ! -L ${IMAGE_ROOTFS}/init ]; then
touch ${IMAGE_ROOTFS}/init
fi
(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
(cd ${WORKDIR}/cpio_append && echo ./init | cpio -oA -H newc -F ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.cpio)
fi
}
ELF_KERNEL ?= "${STAGING_DIR_HOST}/usr/src/kernel/${KERNEL_IMAGETYPE}"