On Fri, Jul 3, 2020, at 9:32 AM, Zbigniew Jędrzejewski-Szmek wrote: > On Fri, Jul 03, 2020 at 09:18:42AM -0400, Colin Walters wrote: > > On Thu, Jul 2, 2020, at 11:53 AM, Zbigniew Jędrzejewski-Szmek wrote: > > > > > It would be great if we could fairly reliably boot with a read-only > > > root file system, > > > > Eh, just mount a tmpfs for /var, and an overlayfs for /etc (backed by a > > tmpfs). > > I see that this thread is one massive communication failure on my part :( > > I wrote about "booting successfully with a read-only file system", but I > see that I didn't say "... when the disk cannot be mounted rw because of > file system errors". I thought it'd be clear from the context, but it's > clearly not. Anyway, while I'm a big fan of coreos and read-only-on-purpose,
It's really unfortunate how much confusion there is on the "read only" topic... I know there's a fair amount of subtley here but I would hope at least a few more people in the Fedora community take the time to actually dive in to the ostree model and understand things. What I was pointing at is the Fedora CoreOS *LIVE* ISO, which is definitely fully read only (or phased more usefully), does not support persistence at all because physical ISOs don't - same as any other "Live" system from Anaconda to all the others. But that's a totally distinct thing from merely having /usr mounted ro by default, while still supporting persistence for /etc and /var (i.e. the ostree model). > I was writing about traditional systems in a read-only-by-accident scenario, > i.e. about the system behaving gracefully when the disk is ***unexpectedly*** > read-only. That is an important detail indeed =) To be clear I agree with the effort! I think it's going to get really messy to take it very far...and that's what I was getting at in arguing for using overlayfs backed by tmpfs basically. Or maybe it should be more like a "recovery shell" - rather than trying to log in as your regular user and watch e.g. Firefox fail because it can't write to /home and wonder just how much of the next years of your life is going to involve patching software to make this work ;) get enough to get the a desktop launched for a separate ephemeral "live" user with sudo rights or so. _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org
