tests/lib/prepare.sh: use core20 from beta channel temporarily

[anonymouse64]

The core20 snap on edge currently makes all GCE spread runs fail somehow.

[sergiocazzolato]

Thanks for the fix

[codecov-commenter]

Codecov Report

Merging #10708 (b1593e9) into master (8f74175) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #10708      +/-   ##
==========================================
- Coverage   78.36%   78.35%   -0.01%     
==========================================
  Files         884      884              
  Lines       99517    99517              
==========================================
- Hits        77985    77977       -8     
- Misses      16635    16640       +5     
- Partials     4897     4900       +3     

Flag	Coverage Δ
unittests	78.35% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
.../snapcore/snapd/osutil/udev/netlink/rawsockstop.go	66.66% <0.00%> (-4.77%)	⬇️
...ithub.com/snapcore/snapd/daemon/api_connections.go	92.51% <0.00%> (-1.07%)	⬇️
...b.com/snapcore/snapd/overlord/hookstate/hookmgr.go	74.17% <0.00%> (-0.67%)	⬇️
...com/snapcore/snapd/overlord/ifacestate/handlers.go	64.63% <0.00%> (-0.16%)	⬇️

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[anonymouse64]

hmm uc20 is still failing though we at least can shell into the system now after it reboots 🤔 I will leave this to someone in EU to debug tomorrow morning

[mardy]

LGTM!

[mvo5]

This is strange, I cannot reproduce the issue with qemu, core20 edge seems to be fine here. There was a new edge snap yesterday with https://people.canonical.com/~mvo/core20-changes/html/edge/'20210826'r1090_'20210831'r1097.html so it could be related to this but it's strange that we only see it in google.

[sergiocazzolato]

I see the core20 is in channel latest/edge, I think there was a refresh

root@sep011136-995955:~# snap list
Name Version Rev Tracking Publisher Notes
core20 20210831 1097 latest/edge canonical✓ base
pc 20-0.4 115 20/edge canonical✓ gadget
pc-kernel 5.4.0-83.93.1 x1 - - kernel
snapd 2.51.7+git1522.gc980bde x1 - - snapd
test-snapd-rsync-core20 3.1.3 11 latest/edge test-snaps-canonical devmode

[sergiocazzolato]

This is the journal log and snap changes:
https://paste.ubuntu.com/p/RDspjSKbkY/

[sergiocazzolato]

Also tried by using the latest cpu family on gce and the tests are getting stuck as well

[anonymouse64]

There was one errant failure to prepare here where the system didn't come back after a reboot, but I don't think that is related to this, I think we have an existing issue where that happens semi-randomly, but the fact that we still had many UC20 tests run successfully is a sign that this PR is working. I am going to retry though just to be sure that it works multiple times.

[anonymouse64]

The core20 snap on edge is now updated to not break us so this branch is not necessary, however I would still like to change some things here, but I will propose that separately.