[PATCH v2 0/3] tests/functional: improve handling flaky downloads

["Daniel P. Berrangé" <berrange@redhat.com>]

This fixes the functional-system-debian job with the currently
awol archive.openwrt.org server.

  https://gitlab.com/berrange/qemu/-/jobs/11173491503

We can see the download fail & retry, and then gracefully
skip pre-cache:

2025-08-29 15:10:11,242 - qemu-test - INFO - Attempting to cache '/var/home/berrange/.cache/qemu/download/d3a01037f33e7512d46d50975588d5c3a0e0cbf25f37afab44775c2a2be523e6'
2025-08-29 15:10:11,242 - qemu-test - INFO - Downloading https://archive.openwrt.org/chaos_calmer/15.05.1/realview/generic/openwrt-15.05.1-realview-vmlinux-initramfs.elf to /var/home/berrange/.cache/qemu/download/d3a01037f33e7512d46d50975588d5c3a0e0cbf25f37afab44775c2a2be523e6...
2025-08-29 15:12:24,116 - qemu-test - ERROR - Unable to download https://archive.openwrt.org/chaos_calmer/15.05.1/realview/generic/openwrt-15.05.1-realview-vmlinux-initramfs.elf: URL error [Errno 110] Connection timed out
2025-08-29 15:12:24,116 - qemu-test - ERROR - https://archive.openwrt.org/chaos_calmer/15.05.1/realview/generic/openwrt-15.05.1-realview-vmlinux-initramfs.elf: Unable to download: URL error [Errno 110] Connection timed out: skipping asset precache

And then later the test itself is skipped:

55/67 qemu:func-thorough+func-arm-thorough+thorough / func-arm-realview            SKIP              0.11s   0 subtests passed

Changed in v2:

 - Simplifiy patch 2 - adding the URL was NOT in fact needed,
   as AssetError adds that automatically
 - Avoid retries on URLError failures

Daniel P. Berrangé (3):
  tests/functional: enable force refresh of cached assets
  tests/functional: fix formatting of exception args
  tests/functional: handle URLError when fetching assets

 docs/devel/testing/functional.rst   |  3 +++
 tests/functional/qemu_test/asset.py | 16 ++++++++++++++--
 2 files changed, 17 insertions(+), 2 deletions(-)

-- 
2.50.1