[OE-core] [PATCH 1/4] image.bbclass: add a hook funtion to support readonly rootfs

Bernhard Reutner-Fischer rep.dot.nop at gmail.com
Tue Feb 19 11:39:47 UTC 2013


On 19 February 2013 08:38,  <Qi.Chen at windriver.com> wrote:
> From: Chen Qi <Qi.Chen at windriver.com>
>
> read_only_rootfs_hook: this funtion is invoked only if 'read-only-rootfs'
> is in IMAGE_FEATURES. It tweaks some basic files and makes populate-
> volatile.sh script run at rootfs time.
>
> For now, it has real effect only if the init system is sysvinit.
>
> [YOCTO #3406]
>
> Signed-off-by: Chen Qi <Qi.Chen at windriver.com>
> ---
>  meta/classes/image.bbclass |   18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
>
> diff --git a/meta/classes/image.bbclass b/meta/classes/image.bbclass
> index dd78acb..7d533b6 100644
> --- a/meta/classes/image.bbclass
> +++ b/meta/classes/image.bbclass
> @@ -233,6 +233,24 @@ run_intercept_scriptlets () {
>         fi
>  }
>
> +# A hook function to support read-only-rootfs IMAGE_FEATURES
> +# Currently, it only supports sysvinit system.
> +read_only_rootfs_hook () {
> +       if ${@base_contains("DISTRO_FEATURES", "sysvinit", "true", "false", d)}; then
> +               # Tweak the mount option in fstab
> +               sed -i '/rootfs/ s/defaults/ro/' ${IMAGE_ROOTFS}/etc/fstab

to be cautious i would say
sed -i -e '/^[#[:space:]]*rootfs/s/defaults/ro/' ${IMAGE_ROOTFS}/etc/fstab
for ro rootfs fs_passno should be set to 0, too, imo:
sed -i -e '/^[#[:space:]]*rootfs/{s/defaults/ro/;s/\([[:space:]]*[[:digit:]]\)\([[:space:]]*\)[[:digit:]]$/\1\20/}'
${IMAGE_ROOTFS}/etc/fstab

> +               # Change the value of ROOTFS_READ_ONLY in /etc/default/rcS to yes
> +               if [ -e ${IMAGE_ROOTFS}/etc/default/rcS ]; then
> +                       sed -i 's/ROOTFS_READ_ONLY=no/ROOTFS_READ_ONLY=yes/' ${IMAGE_ROOTFS}/etc/default/rcS
> +               fi
> +               # Run populate-volatile.sh at rootfs time to set up basic files
> +               # and directories to support read-only rootfs.
> +               if [ -e ${IMAGE_ROOTFS}/etc/init.d/populate-volatile.sh ]; then

-x if you want to execute it below.
> +                       ${IMAGE_ROOTFS}/etc/init.d/populate-volatile.sh
> +               fi
> +       fi
> +}
> +
>  fakeroot do_rootfs () {
>         #set -x
>         # When use the rpm incremental image generation, don't remove the rootfs




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