Re: [PATCH] image_types: Ensure /init exists for cpio rootfs archives

[Darren Hart <dvhart@linux.intel.com>]

On 12/30/2011 12:25 AM, Andrea Adami wrote:
> On Thu, Dec 29, 2011 at 12:54 AM, Darren Hart <darren.hart@intel.com> wrote:
>> <I sent this to the yocto list by mistake, forwarding here for comment>
>>
>> In order for the kernel to accept an initramfs as a rootfs,
>> it must have /init - even if it is an empty file. Touch /init
>> to ensure it exists for cpio and cpio.gz image types.
> 
> Why didn't you add the init to cpio.xz and cpio.lzma?
> Any special reason?

No reason, just missed them I guess. I can resent with them included if
we agree this is a reasonable approach.

--
Darren

> 
>>
>> When used with initrd and rootfs=/dev/ram0, this allows the
>> cpio and cpio.gz images to be used as the rootfs.
> 
> Sure, and "...If all else fails, rdinit=/bin/sh "
> 
>>
>> Signed-off-by: Darren Hart <dvhart@linux.intel.com>
>> ---
>>  meta/classes/image_types.bbclass |   10 ++++++++--
>>  1 files changed, 8 insertions(+), 2 deletions(-)
>>
>> diff --git a/meta/classes/image_types.bbclass b/meta/classes/image_types.bbclass
>> index 6893e38..ebff0ba 100644
>> --- a/meta/classes/image_types.bbclass
>> +++ b/meta/classes/image_types.bbclass
>> @@ -110,8 +110,14 @@ IMAGE_CMD_tar = "cd ${IMAGE_ROOTFS} && tar -cvf ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME
>>  IMAGE_CMD_tar.gz = "cd ${IMAGE_ROOTFS} && tar -zcvf ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.tar.gz ."
>>  IMAGE_CMD_tar.bz2 = "cd ${IMAGE_ROOTFS} && tar -jcvf ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.tar.bz2 ."
>>  IMAGE_CMD_tar.xz = "cd ${IMAGE_ROOTFS} && tar --xz -cvf ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.tar.xz ."
>> -IMAGE_CMD_cpio = "cd ${IMAGE_ROOTFS} && (find . | cpio -o -H newc >${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.cpio)"
>> -IMAGE_CMD_cpio.gz = "cd ${IMAGE_ROOTFS} && (find . | cpio -o -H newc | gzip -c -9 >${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.cpio.gz)"
>> +IMAGE_CMD_cpio () {
>> +       touch ${IMAGE_ROOTFS}/init
>> +       cd ${IMAGE_ROOTFS} && (find . | cpio -o -H newc >${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.cpio)
>> +}
>> +IMAGE_CMD_cpio.gz () {
>> +       touch ${IMAGE_ROOTFS}/init
>> +       cd ${IMAGE_ROOTFS} && (find . | cpio -o -H newc | gzip -c -9 >${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.cpio.gz)
>> +}
>>  IMAGE_CMD_cpio.xz = "type cpio >/dev/null; cd ${IMAGE_ROOTFS} && (find . | cpio -o -H newc | xz -c ${XZ_COMPRESSION_LEVEL} --check=${XZ_INTEGRITY_CHECK} > ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.cpio.xz) ${EXTRA_IMAGECMD}"
>>  IMAGE_CMD_cpio.lzma = "type cpio >/dev/null; cd ${IMAGE_ROOTFS} && (find . | cpio -o -H newc | xz --format=lzma -c ${XZ_COMPRESSION_LEVEL} --check=${XZ_INTEGRITY_CHECK} >${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.cpio.lzma) ${EXTRA_IMAGECMD}"
>>
>> --
>> 1.7.6.4
>>
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> 
> Regards
> 
> Andrea Adami
> 
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-- 
Darren Hart
Intel Open Source Technology Center
Yocto Project - Linux Kernel