Incorrect package url when using -syncer-packages-url

[alejandro-ripoll]

Description

After enabling -syncer-packages-url, {{ARCH}} is replaced with "amd64" instead of "amd64-usr" on packages url, causing download to fail.

Impact

Unable to download flatcar updates using -syncer-packages-url.

Environment and steps to reproduce

1. Set-up:
   Setup a corporate proxy on https:///myrepository/raw-proxy-flatcar/ for https://update.release.flatcar-linux.net/.
   Configure Nebraska with -syncer-packages-url=https:///myrepository/raw-proxy-flatcar/{{ARCH}}/{{VERSION}}
2. Error: ARCH is incorrectly replaced on new packages created by syncer, for example https:///myrepository/raw-proxy-flatcar/amd64/4081.2.1 instead of https:///myrepository/raw-proxy-flatcar/amd64-usr/4081.2.1.

Expected behavior

URL for packages created by syncer should be valid.

Additional information

Nebraska version: 2.9.0

Relevant code:
https://github.com/flatcar/nebraska/blob/main/backend/pkg/syncer/syncer.go#L386
https://github.com/flatcar/nebraska/blob/main/backend/pkg/syncer/syncer.go#L292

[tormath1]

Hello @alejandro-ripoll and thanks for report. The --syncer-packages-url is actually a template URL, so if your targeted URL needs -usr, you could try to set it via this URL: -syncer-packages-url=https:///myrepository/raw-proxy-flatcar/{{ARCH}}-usr/{{VERSION}}.

Let us know if it solves your issue.

[alejandro-ripoll]

Hi @tormath1, that works.
Thanks a lot for the quick response.

[ErvinRacz]

Hello @alejandro-ripoll,
Thanks for reporting the problem found by your use case. Arguably it is an important one which Nebraska missed the documentation for.

I just added a small note under the example with the -syncer-packages-url option based on your experience.