"snapcraft cleanbuild" requires "connectivity"

[Robie Basak]

To build a snap reliably and reproducibly, I've adjusted snapcraft.yaml so that it doesn't require an Internet connection to random third parties, and am behind a firewall that enforces this.

Recently this started failing.

It appears that you've been requiring a "connectivity check" for a while that was to start.ubuntu.com (which happens to be allowed in my case), but this has recently changed to connectivity-check.ubuntu.com (which is not allowed in my case).

It doesn't make sense to ask for the firewall to be permitted to access connectivity-check.ubuntu.com. This machine has never had general access to the Internet, so making that change would produce a false result anyway.

Expected results: "snapcraft cleanbuild" is capable of building without Internet access when such Internet access isn't required by the build.

Actual results:

$ snapcraft cleanbuild
Creating snapcraft-whorishly-unaging-linwood
Starting snapcraft-whorishly-unaging-linwood
Waiting for a network connection...
Failed to open 'http://connectivity-check.ubuntu.com/': timed out
Failed to open 'http://connectivity-check.ubuntu.com/': timed out
Failed to open 'http://connectivity-check.ubuntu.com/': timed out
Failed to open 'http://connectivity-check.ubuntu.com/': timed out
Failed to open 'http://connectivity-check.ubuntu.com/': timed out
Stopping local:snapcraft-whorishly-unaging-linwood
Sorry, an error occurred in Snapcraft:
Failed to get a network connection in the container: could not successfully ping 'start.ubuntu.com'.
If using a proxy, check its configuration. Refer to the documentation at https://linuxcontainers.org/lxd/getting-started-cli.

Note that the error message is also wrong now, referring to start.ubuntu.com when snapcraft is actually trying to reach connectivity-check.ubuntu.com. There is also no proxy configuration instructions at the linked linuxcontainers.org page.

Sample snapcraft.yaml that triggers this:

name: test-snap
version: '1'
summary: Test snap summary
description: |
  Test snap description

grade: devel
confinement: classic

parts:
  part1:
    plugin: nil
    source: .

Note that there is no base.

[Robie Basak (racb)]

Version:

installed: 4.2.post13+gitab04b216 (5447) 70MB classic

[Robie Basak (racb)]

Workaround: "sudo snap refresh --channel stable/4.1" reverts to the old start.ubuntu.com behaviour, for which my "connectivity check" happens to succeed.

[Sergio Schvezov (sergiusens)]

4.3 moved back to the previous endpoint but I will leave this task open to get rid of that dependency completely

[Sergio Schvezov (sergiusens)]

cleanbuild is no longer supported, all builds by default now transparently "cleanbuild"