[OE-core] [PATCH V5 2/4] image.bbclass: add two hook funtions

[ChenQi]

Hi Otavio,

Thank you for you review and suggestions :)
And please see some details below.

On 01/02/2013 02:12 AM, Otavio Salvador wrote:
> On Mon, Dec 31, 2012 at 12:16 AM,  <Qi.Chen at windriver.com> wrote:
>> From: Chen Qi <Qi.Chen at 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 is invoked no matter
>> 'read-only-rootfs' is in IMAGE_FEATURES or not, it properly chooses
>> the right conf file for volatile storage handling according to the
>> IMAGE_FEATURES.
>>
>> [YOCTO #3406]
>>
>> Signed-off-by: Chen Qi <Qi.Chen at windriver.com>
>> ---
>>   meta/classes/image.bbclass |   30 ++++++++++++++++++++++++++++++
>>   1 file changed, 30 insertions(+)
>>
>> diff --git a/meta/classes/image.bbclass b/meta/classes/image.bbclass
>> index d3a416d..57bd0e3 100644
>> --- a/meta/classes/image.bbclass
>> +++ b/meta/classes/image.bbclass
>> @@ -396,6 +396,36 @@ 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 -i '/rootfs/ s/defaults/ro/' ${IMAGE_ROOTFS}/etc/fstab
> Maybe use 'defaults,ro' in fstab?
In my understanding, 'ro' and 'defaults,ro' are the same. Maybe I'm 
wrong, but what's the difference between them?
>> +       # 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
>> +}
>> +
>> +# 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
>> +               if [ -e ${IMAGE_ROOTFS}/etc/default/volatiles_stage/volatiles-readonly-sato ]; then
>> +                       cp ${IMAGE_ROOTFS}/etc/default/volatiles_stage/volatiles-readonly-sato \
>> +                               ${IMAGE_ROOTFS}/etc/default/volatiles/00_core_readonly
>> +               fi
>> +       else
>> +               if [ -e ${IMAGE_ROOTFS}/etc/default/volatiles_stage/volatiles-readonly-minimal ]; then
>> +                       cp ${IMAGE_ROOTFS}/etc/default/volatiles_stage/volatiles-readonly-minimal \
>> +                               ${IMAGE_ROOTFS}/etc/default/volatiles/00_core_readonly
>> +               fi
>> +       fi
> Wouldn't be better to have a package which provides the need valatile
> config? this makes it easy to reuse for other images.
Yes, you're right.

In fact, I think it should be the initscripts recipe which provides the 
volatile conf files. Because both populate-volatile.sh and the conf 
files it uses logically belong to initscripts.
So I'll remove this function from image.bbclass and choose the correct 
conf file in the initscripts recipe.

Also, for the purpose of easy use, as you mentioned above, I think we 
should allow users to use customized conf file if they want to.
So I want to support customized conf file for volatile storages in 
initscripts recipe.

That's all what I've came up with for now.
I'll send out a patch V6 as soon as possible.

Cheers,
Chen Qi
>> +}
>> +
>>   # 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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>
>
> --
> Otavio Salvador                             O.S. Systems
> E-mail: otavio at ossystems.com.br  http://www.ossystems.com.br
> Mobile: +55 53 9981-7854              http://projetos.ossystems.com.br
>
>