Re: criterion proposal: upgrading across 2 releases
On Wed, 2015-11-25 at 16:51 -0500, Richard Ryniker wrote:
> A month is a pretty long time in Fedora development
True, but a month is only available if the problem is reported on day 1.
If it takes a week or two for a user to report a problem, that interval
lessens the remaining time to EOL.
On the other other hand, you can test upgrades at any time, with dnf-
system-upgrade. We're already testing 22-24 upgrades daily in openQA at
present.
On the other hand, there is no prohibition against a fix after EOL.
There is, in fact; you can't push updates for EOL releases, it's simply
disabled by policy.
We also do not know there will be serious problems. We know it is
impossible to test more than a miniscule fraction of possible upgrade
cases. That does not mean there will be lots of bugs, it means we have
little confidence the test plan has found most bugs. We might say there
is no reason to believe experience with the current release will be any
worse than the last.
This is basically what I'm saying: we can't actually make any
guarantees about *most* upgrade experiences, and N-2 upgrades aren't
really some special case which is massively more likely to go wrong
than any other. Will we have people who have issues doing N-2 upgrades?
Probably, sure. Do we have people who have issues doing N-1 upgrades?
yep! This isn't something new. We *do*, I think, mention in all the
relevant documentation that upgrades are complex operations and success
is never guaranteed, that's not what 'supported' means, especially in
this context.
As far as I know, this is the first time "dnf
system-upgrade" has been
generally available for a release-skip upgrade. It is way too early to
have any historical perspective.
F23 is the first release where the dnf-system-upgrade mechanism has
been available, yes. But it's really not hugely different from fedup -
it's just an even lighter implementation of the same basic idea (just
boot to a minimal environment and run a dnf transaction). The
experience of fedup should be a reasonable indicator of future dnf-
system-upgrade experiences.
--
Adam Williamson
Fedora QA Community Monkey
IRC: adamw | Twitter: AdamW_Fedora | XMPP: adamw AT happyassassin . net
http://www.happyassassin.net