[oe] [PATCH 1/4] bitbake.conf: add ext4 image support

[Bjørn Forsman]

Hi,

On 6 August 2010 11:40, Bernhard Reutner-Fischer <rep.dot.nop at gmail.com> wrote:
> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop at gmail.com>
> ---
>  conf/bitbake.conf      |    6 ++++++
>  conf/local.conf.sample |    2 +-
>  2 files changed, 7 insertions(+), 1 deletions(-)
>
> diff --git a/conf/bitbake.conf b/conf/bitbake.conf
> index abe500a..9b0afce 100644
> --- a/conf/bitbake.conf
> +++ b/conf/bitbake.conf
> @@ -366,6 +366,8 @@ IMAGE_CMD_ext2 = "genext2fs -b ${ROOTFS_SIZE} -d ${IMAGE_ROOTFS} ${DEPLOY_DIR_IM
>  IMAGE_CMD_ext2.gz = "install -d ${DEPLOY_DIR_IMAGE}/tmp.gz ; genext2fs -b ${ROOTFS_SIZE} -d ${IMAGE_ROOTFS} ${DEPLOY_DIR_IMAGE}/tmp.gz/${IMAGE_NAME}.rootfs.ext2 ${EXTRA_IMAGECMD}; gzip -f -9 ${DEPLOY_DIR_IMAGE}/tmp.gz/${IMAGE_NAME}.rootfs.ext2; mv ${DEPLOY_DIR_IMAGE}/tmp.gz/${IMAGE_NAME}.rootfs.ext2.gz ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.ext2.gz"
>  IMAGE_CMD_ext3 = "genext2fs -b ${ROOTFS_SIZE} -d ${IMAGE_ROOTFS} ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.ext3 ${EXTRA_IMAGECMD}; tune2fs -j ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.ext3"
>  IMAGE_CMD_ext3.gz = "install -d ${DEPLOY_DIR_IMAGE}/tmp.gz ; genext2fs -b ${ROOTFS_SIZE} -d ${IMAGE_ROOTFS} ${DEPLOY_DIR_IMAGE}/tmp.gz/${IMAGE_NAME}.rootfs.ext3 ${EXTRA_IMAGECMD}; tune2fs -j ${DEPLOY_DIR_IMAGE}/tmp.gz/${IMAGE_NAME}.rootfs.ext3; gzip -f -9 ${DEPLOY_DIR_IMAGE}/tmp.gz/${IMAGE_NAME}.rootfs.ext3; mv ${DEPLOY_DIR_IMAGE}/tmp.gz/${IMAGE_NAME}.rootfs.ext3.gz ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.ext3.gz"
> +IMAGE_CMD_ext4 = "genext2fs -b ${ROOTFS_SIZE} -d ${IMAGE_ROOTFS} ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.ext4 ${EXTRA_IMAGECMD}; tune2fs -j ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.ext4"
> +IMAGE_CMD_ext4.gz = "install -d ${DEPLOY_DIR_IMAGE}/tmp.gz ; genext2fs -b ${ROOTFS_SIZE} -d ${IMAGE_ROOTFS} ${DEPLOY_DIR_IMAGE}/tmp.gz/${IMAGE_NAME}.rootfs.ext4 ${EXTRA_IMAGECMD}; tune2fs -j ${DEPLOY_DIR_IMAGE}/tmp.gz/${IMAGE_NAME}.rootfs.ext4; gzip -f -9 ${DEPLOY_DIR_IMAGE}/tmp.gz/${IMAGE_NAME}.rootfs.ext4; mv ${DEPLOY_DIR_IMAGE}/tmp.gz/${IMAGE_NAME}.rootfs.ext4.gz ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.ext4.gz"

It seems the IMAGE_CMDs for ext3 and ext4 exactly alike (except for the
filename)? Or am I missing something? According to [1], converting ext2 fs
to ext4 is performed like this:

  tune2fs -j /dev/DEV
  tune2fs -O extents,uninit_bg,dir_index /dev/DEV

followed by a fsck to fix up some structures

  e2fsck -fDC0 /dev/DEV


Best regards,
Bjørn Forsman

[1]: https://ext4.wiki.kernel.org/index.php/Ext4_Howto