On 12/27/2012 04:42 PM, Martin Jansa wrote:
On Thu, Dec 27, 2012 at 10:57:39AM +0800, qi.c...@windriver.com wrote:
From: Chen Qi <qi.c...@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.
choose_volatile_conf_file is always called from core-image with or
without read-only-rootfs in IMAGE_FEATURES.
So it will use /etc/default/volatiles_stage/volatiles-readonly-minimal
without read-only-rootfs.
Cheers,
Yes. And I did this on purpose.
I want to ship the conf file no matter we're building a
'read-only-rootfs' image or not.
In this way, changing 'ROOTFS_READ_ONLY' to 'yes' on a currently running
system and rebooting will give the user a working system with read-only
rootfs.
If the rootfs is not read-only, this conf file will not be applied, both
at rootfs construction time and at system startup time.
Best Regards,
Chen Qi
[YOCTO #3406]
Signed-off-by: Chen Qi <qi.c...@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
+ # 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
--
1.7.9.5
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