From patchwork Mon Jan 28 09:05:06 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [2/6] image.bbclass: add a hook funtion to support readonly rootfs Date: Mon, 28 Jan 2013 09:05:06 -0000 From: Qi.Chen@windriver.com X-Patchwork-Id: 43489 Message-Id: <92c81da2144accfbe17277281e4dd22742664967.1359362547.git.Qi.Chen@windriver.com> To: Cc: Zhenfeng.Zhao@windriver.com From: Chen Qi 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 --- meta/classes/image.bbclass | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/meta/classes/image.bbclass b/meta/classes/image.bbclass index 9b4dec8..9c51bf6 100644 --- a/meta/classes/image.bbclass +++ b/meta/classes/image.bbclass @@ -201,6 +201,24 @@ 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 + # 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 + ${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