[systemd-devel] Possible systemd segfault switching from 216 to 219 in fedora upgrade

[Chris Murphy]

On Sun, Mar 8, 2015 at 4:32 PM, Lennart Poettering
<lennart at poettering.net> wrote:
> On Thu, 05.03.15 22:07, James Hogarth (james.hogarth at gmail.com) wrote:

>> This naturally means that the serialization/deserialization needs to
>> be forwards *and* backwards compatible between 216 and 219 for this to
>> work.
>
> Yeah, but no. Allowing uprgades is one thing, allowing downgrades a
> completely different one, and nothing we want to support.

I don't see how it's even practical if you wanted to. It would also
need to support systemd-208 for Fedora 20, and possibly systemd-204
for Fedora 19.

Users must be able to upgrade to Fedora n from Fedora n-2 and n-1, as
they're supported systems still. Arguably users ought to be able to
upgrade out of the most recent EOL'd Fedora, n-3.

It makes me look forward to atomically updated/upgraded stateless
systems so we can avoid these kinds of musical chairs figuring out
nutty layout assembly to make sure updates actually work.

-- 
Chris Murphy