data: fail closed when a mirror is unreachable, not silently short - #447
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The nightly base-files index generator treated "the archive did not answer"
the same as "the archive says this is not published": both hit a warning and
a `continue`. On 2026-09-11 one 30s read timeout against archive.ubuntu.com
was enough to drop Ubuntu resolute out of the generated index entirely:
WARNING: skipping release ubuntu/resolute: HTTPConnectionPool(
host='archive.ubuntu.com', port=80): Read timed out. (read timeout=30)
The run reported success, the workflow committed the result, and every
resolute build started failing in apt_find_upstream_package_version_and_
download_url with a null base-files filename (armbian/build#10680). The same
run also quietly lost questing amd64/amd64v3, plucky amd64 and jammy-updates
amd64, breaking x86_64 builds of those releases without anyone filing a bug.
Nothing was actually wrong upstream: re-running the workflow unchanged
restored every entry.
Route all four fetches through an http_get that retries with backoff (4
attempts, 60s timeout) and then distinguishes the two cases. A 404 is an
answer - the release or architecture is genuinely not published, warn and
skip as before. A timeout, connection error or 5xx is not an answer, and is
now collected and turned into a non-zero exit at the end, so no partial
index is ever written and the previously published one stays in place.
The workflow gets a backstop for anything that gets past that: before
committing, the generated index is compared against the published one and
any release or architecture that disappeared aborts the publish. A genuine
upstream removal can still be published by re-running with
allow_removals=true.
Signed-off-by: Igor Pecovnik <igor@armbian.com>
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. WalkthroughThe generator now retries upstream requests and distinguishes missing resources from unreachable services. It loads the published index and carries forward entries when upstream data is unreachable. It exits without writing when no fallback exists. The workflow checks for removed releases or architectures and blocks them unless Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix · Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to The updated generator and publication workflow prevent transient upstream failures from silently removing published base-file entries while preserving an explicit path for intentional removals. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In `@scripts/generate-base-files-info-json.py`:
- Around line 7-60: Update http_get to catch non-404 HTTP errors from
response.raise_for_status() and route them through the existing retry logic,
ultimately raising UpstreamUnreachable after exhausting attempts. Preserve the
special UpstreamGone behavior for 404 responses and the successful response path
for status codes below 400.
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.github/workflows/data-update-base-files-info.ymlscripts/generate-base-files-info-json.py
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Review catch. http_get called raise_for_status() for any status below 500, so a 403 or a 429 left the function as an unhandled HTTPError: no retry, and no conversion into UpstreamUnreachable. The run still failed closed, since nothing reaches the write, but it died with a traceback instead of the controlled path, and a rate-limited mirror - the most retryable failure there is - got no retry at all. Return on response.ok and treat every other status but 404 as retryable, ending in UpstreamUnreachable once the attempts run out. 404 stays the one status read as a statement about what upstream publishes. Verified against a local server: 429, 403, 500 and 503 all retry and end as UpstreamUnreachable, 404 is UpstreamGone, 200 returns. Signed-off-by: Igor Pecovnik <igor@armbian.com>
Combines this with #446. Failing the run on an unreachable mirror keeps a broken index from being published, but it also throws away the releases that *were* fetched fine, so a single bad mirror costs the whole day's refresh. Seed release_hash from the published index, restricted to the releases we still want, and fall back to it per release and per architecture when - and only when - upstream could not be reached. A 404 still drops the entry, so a retired release or architecture does not live on for ever. Seeding alone is not enough, which is why it is wired in at both levels. release_hash[release] = packages assigns wholesale, so a seeded entry is overwritten whenever the release itself is reachable but one architecture is not. That is not hypothetical: the run that lost resolute also lost questing amd64 and amd64v3, plucky amd64 and jammy-updates amd64 that way, and nobody noticed until the index was compared against the previous one. Fail-closed stays for what has nothing to fall back on - a release never published before, or a run that could not read the published index at all. Anything carried forward is reported as a GitHub ::warning, so a quietly degrading mirror is still visible rather than silently papered over. main() extracted from the __main__ block so these paths can be driven directly in a test: healthy, release unreachable with and without a seed, architecture unreachable with and without a seed, and a 404 architecture staying dropped. Co-authored-by: silvervest <silvervest@users.noreply.github.com> Signed-off-by: Igor Pecovnik <igor@armbian.com>
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Closes armbian/build#10680
What happened
The nightly run on 2026-09-11 at 08:17 UTC reported success while silently dropping Ubuntu resolute from the published index:
The workflow committed that result. Every resolute build then failed in
apt_find_upstream_package_version_and_download_urlwith a nullbase-filesfilename, because.resolute.arm64no longer existed.The same run also lost entries nobody filed a bug for:
amd64,amd64v3amd64amd64i386Nothing was wrong upstream. Re-running the workflow unchanged restored every entry, which is what makes this a process bug rather than an archive bug.
Cause
get_debian_architecturesfetchesarchive.ubuntu.com/ubuntu/dists/<release>/InRelease, and the release-level handler caughtrequests.exceptions.RequestExceptionalongsideFileNotFoundErrorandcontinued. So "the archive did not answer" and "the archive says this is not published" were the same code path. A single 30-second timeout was indistinguishable from a release being retired.Supersedes #446, whose carry-forward approach is folded in here (@silvervest credited as co-author). That PR spotted the same root cause first, from the same log line.
Change
Generator — all four fetches now go through an
http_getthat retries with backoff (4 attempts, 60s timeout), then separates the two cases:404→UpstreamGone. A real answer; warn and skip, as before. This keeps the deliberate tolerance for an architecture mid-promotion between debian-ports and the main archive.UpstreamUnreachable. Not an answer. Collected, and turned into a non-zero exit at the end, before anything is written. No partial index is produced, so the previously published one stays in place and builds keep working.Carry-forward (from #446) —
release_hashis seeded from the published index, restricted to the releases still wanted, and used as the fallback when upstream could not be reached. Applied at both the release and the architecture level:release_hash[release] = packagesassigns wholesale, so seeding at release level alone is silently overwritten whenever the release is reachable but one architecture is not — which is how the same run also lostquestingamd64/amd64v3,pluckyamd64 andjammy-updatesamd64. A 404 still drops the entry, so a retired release or architecture does not live on for ever.Fail-closed now applies only to what has nothing to fall back on: a release never published before, or a run that could not read the published index at all. Anything carried forward is reported as a GitHub
::warning, so a quietly degrading mirror stays visible.Workflow — a backstop for anything that gets past that. Before committing, the generated index is compared against the currently published one; any release or architecture that disappeared aborts the publish with the list. A genuine upstream removal can still be published by re-running with
allow_removals=true.Testing
http_getclassification: 404 →UpstreamGone, unroutable host →UpstreamUnreachableafter retrying, healthy URL → 200.allow_removals=trueoverrides.main()was extracted from the__main__block so the carry-forward paths can be driven directly. Six cases pass: healthy run; release unreachable with a seed (carried, exit 0); architecture unreachable with a seed (carried — the case seeding at release level alone misses); a 404 architecture staying dropped rather than resurrected; release unreachable with no seed (fail closed, nothing written); architecture unreachable with no seed (fail closed).resolutewith all 8 architectures, and byte-identical coverage to the current published index —.resolute.arm64 = base-files_14ubuntu6_arm64.deb.Note on scope
A bad upstream day now refreshes everything reachable, carries forward only what it could not reach, and says so loudly. It fails the run outright only when there is nothing to fall back on. What it does not do is paper over a persistent upstream problem indefinitely — a release stuck on carried-forward values keeps emitting the warning every run, which is the signal to go look.