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>
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@ -224,6 +224,24 @@ run_intercept_scriptlets () {
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fi
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}
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# A hook function to support read-only-rootfs IMAGE_FEATURES
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# Currently, it only supports sysvinit system.
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read_only_rootfs_hook () {
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if ${@base_contains("DISTRO_FEATURES", "sysvinit", "true", "false", d)}; then
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# Tweak the mount option and fs_passno for rootfs in fstab
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sed -i -e '/^[#[:space:]]*rootfs/{s/defaults/ro/;s/\([[:space:]]*[[:digit:]]\)\([[:space:]]*\)[[:digit:]]$/\1\20/}' ${IMAGE_ROOTFS}/etc/fstab
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# Change the value of ROOTFS_READ_ONLY in /etc/default/rcS to yes
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if [ -e ${IMAGE_ROOTFS}/etc/default/rcS ]; then
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sed -i 's/ROOTFS_READ_ONLY=no/ROOTFS_READ_ONLY=yes/' ${IMAGE_ROOTFS}/etc/default/rcS
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fi
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# Run populate-volatile.sh at rootfs time to set up basic files
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# and directories to support read-only rootfs.
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if [ -x ${IMAGE_ROOTFS}/etc/init.d/populate-volatile.sh ]; then
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${IMAGE_ROOTFS}/etc/init.d/populate-volatile.sh
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fi
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fi
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}
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fakeroot do_rootfs () {
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#set -x
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# When use the rpm incremental image generation, don't remove the rootfs
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