[PATCH 02/12] image.bbclass: add a hook funtion to support readonly rootfs

Qi.Chen
2013-01-24T08:32:34Z

From: Chen Qi <Qi.Chen@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@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 0293d2e..91045fc 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
--
1.7.9.5