[yocto] How handle files needing updates in read-only filesystem

[Ulf Samuelsson]

Thanks, is it more efficient than symlinking?

Best Regards,
Ulf Samuelsson

> 13 juni 2018 kl. 15:20 skrev Anders Darander <anders at chargestorm.se>:
> 
> * Ulf Samuelsson <yocto at emagii.com> [180612 22:01]:
> 
>> We want most of /etc to be read-only for security reasons,
>> and the overlayfs will make the whole of /etc writeable.
> 
>> I tried mount —bind /etc/timezone /persistent/etc/timezone, and it
>> complained that they were not directories. Bind mounting /etc again
>> will make all of /etc writeable.
> 
> Try to use: mount —o bind /etc/timezone /persistent/etc/timezone
> 
> I'm using that heavily, either manually or by the volatile-binds recipe.
> It works perfectly fine with files.
> 
>> Symlinking to /persistent is fine, so the question is what an
>> acceptable method is to have a simple way of ensuring that a certain
>> file is converted to that symlink.
> 
> This is normally done by a manual inspection / addition of bbappend
> file.
> 
> Cheers,
> Anders
> -- 
> Anders Darander, Senior System Architect
> ChargeStorm AB / eStorm AB