Failure to sync an image with default mirror_list

[Tolga Kaprol]

We are using glance-simplestreams-sync rev 34 on our focal-ussuri release.

We discovered that the default mirror_list option on the charm started to fail since January. Since Focal and Bionic images were successfully updated, trusty and xenial were failing.

Juju status glance-simplestreams-sync for was "Image sync failed, retrying soon."

We simply removed trusty from default mirror_list setting and it worked.

Here is the log from glance-simplestreams-sync when it was failing:

ERROR * 04-27 12:00:10 [PID:1115534] * root * Exception during syncing:
Traceback (most recent call last):
  File "/usr/share/glance-simplestreams-sync/glance_simplestreams_sync.py", line 432, in main
    do_sync(charm_conf)
  File "/usr/share/glance-simplestreams-sync/glance_simplestreams_sync.py", line 289, in do_sync
    subprocess.check_call(sync_command)
  File "/usr/lib/python3.8/subprocess.py", line 364, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['/snap/bin/simplestreams.sstream-mirror-glance', '-vv', '--keep', '--max', '1', '--content-id', 'auto.sync', '--cloud-name', 'etom-cloud-auto-sync', '--path', 'streams/v1/index.sjson', '--name-prefix', 'auto-sync/', '--keyring', '/usr/share/keyrings/ubuntu-cloudimage-keyring.gpg', '--log-file', '/var/snap/simplestreams/common/sstream-mirror-glance.log', '--output-dir', '/root/tmpczeq3u24', 'http://cloud-images.ubuntu.com/releases/', 'release~(xenial|bionic|focal)', 'arch~(x86_64|amd64)', 'ftype~(disk1.img|disk.img)']' returned non-zero exit status 120.
INFO * 04-27 12:00:10 [PID:1115534] * root * Executing command: ['juju-run', 'glance-simplestreams-sync/0', 'status-set blocked "Image sync failed, retrying soon."']

[Alex Kavanagh (ajkavanagh)]

Triage: Indeed, in the config.yaml for the charm:

  mirror_list:
    type: string
    default: "[{url: 'http://cloud-images.ubuntu.com/releases/',
                name_prefix: 'ubuntu:released',
                path: 'streams/v1/index.sjson', max: 1,
                item_filters: ['release~(trusty|xenial|bionic|focal)', 'arch~(x86_64|amd64)', 'ftype~(disk1.img|disk.img)']}]"
    description: >
      YAML-formatted list of simplestreams mirrors and their configuration
      properties. Defaults to downloading the released images from
      cloud-images.ubuntu.com.

As trusty is EOL, it should probably be removed from the default list.