[OE-core] [RFC PATCH] bind: add support for read-only rootfs

[ChenQi]

On 11/21/2013 08:12 PM, Phil Blundell wrote:
> On Thu, 2013-11-21 at 00:59 -0600, Mark Hatle wrote:
>> +# When using a read-only rootfs additional setup may be required
>> +# uncomment the following line to make bind start in read-only rootfs
>> +#ALLOW_ROOTFS_READ_ONLY="yes"
> If the filesystem is read-only then it's going to be fairly difficult
> for the user to uncomment this line on the target.

Hi Phil,

I think the user can remount it read-write or just do it at rootfs time.

> Why would you ever want this variable to be set to anything other than
> "yes"?  If your filesystem is not in fact read-only then it isn't going
> to have any effect, and if your filesystem is read-only then bind won't
> work without it.

The purpose is to disable bind in a read-only file system by default.
But if user really wants it, they can set this value to 'yes'.

>> ++	[ `is_on_read_only_partition /etc/bind` = "yes" ] && bind_mount /var/volatile/bind/etc /etc/bind
>> ++	[ `is_on_read_only_partition /var/named` = "yes" ] && bind_mount /var/volatile/bind/named /var/named
> Is it really necessary to mount a tmpfs at /etc/bind?  Can't those files
> just be relocated somewhere else?

I'm afraid not. At least I don't know how.

Best Regards,
Chen Qi

> p.
>
>
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