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kevinveenbirkenbachandClaude Opus 5
2d94d1d6f9
The Hugo image build in run 34653542922 died on a Debian mirror mid-sync: 'Err:13 libruby ... File has unexpected size (6300780 != 5440). Mirror sync in progress?', and apt closed with its own advice, 'maybe run apt-get update or try with --fix-missing?'. The index the build had fetched disagreed with the pool it then read. Acquire::Retries=3 does not cover that. It re-fetches the same URL against the same stale index and reads the same wrong size, which is why three retries produced three identical failures. install_package_candidates now runs its candidate loop through a helper and, when every candidate failed and the manager is apt-get, fetches a fresh index and runs the loop once more. The helper returns two facts rather than one because the two existing error paths distinguish them: whether the caller's command became callable, and whether anything installed at all. The retry is bounded so it cannot mask a real absence: apt-get only, once, only when nothing installed, and only behind a new index. A package that does not exist fails the second pass the same way and raises the same RuntimeError. The tests pin both directions, the exact update, install, update, install sequence for apt-get and two calls only for a manager without an index, so the retry cannot spread to pacman or dnf. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>