[OE-core] [PATCH 2/4] image.bbclass: add two hook funtions to support read-only rootfs
Saul Wold
sgw at linux.intel.com
Thu Dec 27 18:22:15 UTC 2012
On 12/26/2012 06:57 PM, 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.
>
> choose_volatile_conf_file: this function properly chooses the right
> conf file for volatile storage handling according to the IMAGE_FEATURES.
>
> [YOCTO #3406]
>
> Signed-off-by: Chen Qi <Qi.Chen at windriver.com>
> ---
> meta/classes/image.bbclass | 29 +++++++++++++++++++++++++++++
> 1 file changed, 29 insertions(+)
>
> diff --git a/meta/classes/image.bbclass b/meta/classes/image.bbclass
> index 8bf718a..15d42d0 100644
> --- a/meta/classes/image.bbclass
> +++ b/meta/classes/image.bbclass
> @@ -394,6 +394,35 @@ zap_root_password () {
> mv ${IMAGE_ROOTFS}/etc/passwd.new ${IMAGE_ROOTFS}/etc/passwd
> }
>
> +# A hook function to support read-only-rootfs IMAGE_FEATURES
> +read_only_rootfs_hook () {
> + # Tweak the mount option in fstab
> + sed '/rootfs/ s/defaults/ro/' < ${IMAGE_ROOTFS}/etc/fstab > ${IMAGE_ROOTFS}/etc/fstab.new
> + mv ${IMAGE_ROOTFS}/etc/fstab.new ${IMAGE_ROOTFS}/etc/fstab
> + # Change the value of ROOTFS_READ_ONLY in /etc/default/rcS to yes
> + sed 's/ROOTFS_READ_ONLY=no/ROOTFS_READ_ONLY=yes/' < ${IMAGE_ROOTFS}/etc/default/rcS > ${IMAGE_ROOTFS}/etc/default/rcS.new
> + mv ${IMAGE_ROOTFS}/etc/default/rcS.new ${IMAGE_ROOTFS}/etc/default/rcS
For the above 2 sed/mv, can't you use sed -i instead, cuts down on the
exec overhead.
Sau!
> + # Run populate-volatile.sh at rootfs time to set up basic files
> + # and directories to support read-only rootfs.
> + if [ ! -e ${IMAGE_ROOTFS}/etc/init.d/populate-volatile.sh ]; then
> + echo "${IMAGE_ROOTFS}/etc/init.d/populate-volatile.sh doesn't exist."
> + exit 1
> + else
> + ${IMAGE_ROOTFS}/etc/init.d/populate-volatile.sh
> + fi
> +}
> +
> +# Choose the correct config file for volatile storage handling according to the image type
> +choose_volatile_conf_file () {
> + if ${@base_contains("IMAGE_FEATURES", "x11-sato", "true", "false" ,d)}; then
> + cp ${IMAGE_ROOTFS}/etc/default/volatiles_stage/volatiles-readonly-sato \
> + ${IMAGE_ROOTFS}/etc/default/volatiles/00_core_readonly
> + else
> + cp ${IMAGE_ROOTFS}/etc/default/volatiles_stage/volatiles-readonly-minimal \
> + ${IMAGE_ROOTFS}/etc/default/volatiles/00_core_readonly
> + fi
> +}
> +
> # allow openssh accept login with empty password string
> openssh_allow_empty_password () {
> if [ -e ${IMAGE_ROOTFS}${sysconfdir}/ssh/sshd_config ]; then
>
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