snapd

Improve error for DNS lookup failures

Bug #1663666 reported by Sergio Cazzolato
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Snap Store Server
Invalid
Undecided
Unassigned
Unity8 Session Snap
Invalid
Undecided
Unassigned
snapd
Triaged
Low
Unassigned

Bug Description

I get this assertion when I run the command unity8-snap-install in my zesty vm.
This happens with the today's zesty daily image.

sudo snap install unity8-session --edge --devmode
error: cannot perform the following tasks:
- Fetch and check assertions for snap "unity8-session" (439) (Get https://assertions.ubuntu.com/v1/assertions/snap-revision/rjPkjvvl9AezpBRMi_cxP6yLUf7hychxwsOg7CT68Ygr9JnccHmvCfymWqUEZGTt?max-format=0: dial tcp: lookup assertions.ubuntu.com: no such host)

Revision history for this message
Michał Sawicz (saviq) wrote :

This looks like a network error on your side:

 host assertions.ubuntu.com
assertions.ubuntu.com has address 162.213.33.203
assertions.ubuntu.com has address 162.213.33.202

affects: unity8 (Ubuntu) → unity8-session-snap
Changed in unity8-session-snap:
status: New → Incomplete
Revision history for this message
Sergio Cazzolato (sergio-j-cazzolato) wrote :

I changed the nameserver to 8.8.8.8, rebooted the machine and I ran again.

ubuntu@zesty-unity8-snap:~$ sudo snap install unity8-session --edge --devmode
[sudo] password for ubuntu:
error: cannot perform the following tasks:
- Fetch and check assertions for snap "unity8-session" (439) (Get https://assertions.ubuntu.com/v1/assertions/snap-revision/rjPkjvvl9AezpBRMi_cxP6yLUf7hychxwsOg7CT68Ygr9JnccHmvCfymWqUEZGTt?max-format=0: dial tcp: lookup assertions.ubuntu.com: no such host)

It is happening that I download the 100 % of the snap without any problem.

Revision history for this message
Jean-Baptiste Lallement (jibel) wrote :

I had the same error earlier this week and name resolution worked fine.

Changed in unity8-session-snap:
importance: Undecided → High
status: Incomplete → Confirmed
importance: High → Undecided
Revision history for this message
Michael Vogt (mvo) wrote :

I looked into this a bit and found some theories about leaking fds that can confuse the resolver. I wrote testcode that spawns 50k go routines and never had any issues und 16.10.

I also noticed you run zesty - maybe it is related to that?

Revision history for this message
Sergio Cazzolato (sergio-j-cazzolato) wrote :

Yes running in zesty, today I could install unity8-session snap.

Revision history for this message
Daniel Manrique (roadmr) wrote :

Hello, is this error still happening?

Revision history for this message
Facundo Batista (facundo) wrote :

Hello! The issue title is confusing.

I'm failing to understand how "max-format is not a positive integer assertion" relates to the (apparent) network problem explained in the description and subsequent comments.

Could you please clarify that? thanks!

Changed in snapstore:
status: New → Incomplete
Bret Barker (noise)
Changed in snapstore:
status: Incomplete → Invalid
Michael Vogt (mvo)
Changed in unity8-session-snap:
status: Confirmed → Invalid
summary: - max-format is not a positive integer assertion installing unity8-session
- snap
+ Improve error for DNS lookup failures
Changed in snapd:
status: New → Triaged
importance: Undecided → Low
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