Re: Read-only FS, switch-off safety for raspberry pi

[Jason Thorpe <thorpej%me.com@localhost>]

> On May 16, 2019, at 11:56 AM, Mayuresh <mayuresh%acm.org@localhost> wrote:
> 
> On Thu, May 16, 2019 at 12:38:38PM -0600, Swift Griggs wrote:
>> Sure. That's how optical media works. It's read-only but uses RAM disks for
>> the read/write stuff. Look at the way NetBSD live-CDs have been created and
>> do the same thing.
> 
> Thanks.
> 
> So I presume /var would be a ramdisk and root will be remounted ro or
> something like that?

Not all of /var, necessarily.  And typically the read-only media contains a .tgz of the contents that needs to go there after the tmpfs is set up.

> I guess live-CD methods would require using build.sh, which is time taking
> on pi. Is it possible to achieve the read-only mode by configuring a
> standard installation image?

Cross-build from a faster host with build.sh?

-- thorpej