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image.bbclass: add a hook funtion to support readonly rootfs 

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]

(From OE-Core rev: cae51a169e37b54becc08162aaa643acd53ffe2f)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Chen Qi 2013-01-22 10:34:09 +08:00 committed by Richard Purdie
parent 5a58631eba
commit 142ae3bb06
1 changed files with 18 additions and 0 deletions
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meta/classes/image.bbclass
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@ -224,6 +224,24 @@ 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 and fs_passno for rootfs in fstab
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 [ -x ${IMAGE_ROOTFS}/etc/init.d/populate-volatile.sh ]; then
${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