timer not respected on UC20

[Oliver Grawert]

Even though i have set a timer to refresh only between 4-7am the system refreshed 5 snaps today (which resulted in 4 unwanted reboots) during operation, this is definitely unexpected

$ snap refresh --time
timer: mon-fri,4:00-7:00
last: today at 23:41 UTC
next: n/a

$ snap changes
ID Status Spawn Ready Summary
1049 Doing today at 23:41 UTC - Auto-refresh 5 snaps
...

the content of change 1049 in case this is relevant:

https://paste.ubuntu.com/p/mRkfWNY9Qr/

[Ian Johnson (anonymouse67)]

What is `snap get -d system`?

[Oliver Grawert (ogra)]

the output of "snap get -d system":

https://paste.ubuntu.com/p/fHM2TGTdXr/

[Ian Johnson (anonymouse67)]

Well I can't see anything that would obviously cause this, your timezone setting and the refresh.timer seem to imply that snapd should not have started/attempted the refresh so something is clearly wrong. If you could share snapd logs and also possibly turn on SNAPD_DEBUG=1 so if it happens again we can get more verbose logs that would be great, but as-is I don't see any indication as to why this refresh was performing at that time.

[Paweł Stołowski (stolowski)]

I talked to the team and similar issues were already reported and we know auto-refresh has some confirmed problems in that it doesn't always respect refresh window. According to Samuele this isn't a simple fix though and needs more effort to address properly, so it's something likely to be considered for next development cycle. I'm marking this confirmed.