Arch Linux installer ISO — ZFS-on-root or BTRFS, doubles as rescue disk https://git.cjennings.net/archangel/atom?h=main 2026-04-13T03:58:01+00:00 2026-04-13T03:58:01+00:00 Craig Jennings c@cjennings.net 2026-04-13T03:58:01+00:00 urn:sha1:19f4624749228fcbe385d1edf1d2542c036440ff Peel the testable pieces of get_raid_level() out of the 1600-line installer monolith into installer/lib/raid.sh: - raid_valid_levels_for_count(count) — replaces the inline option-list builder in get_raid_level() - raid_is_valid(level, count) — useful for unattended-config validation - raid_usable_bytes(level, count, smallest, total) — usable-space math - raid_fault_tolerance(level, count) — max tolerable disk failures archangel now sources lib/raid.sh and uses raid_valid_levels_for_count for the fzf option list. Fzf preview subshell still inlines its own usable-bytes arithmetic (calling exported lib functions across preview subshells is fragile; left for a later pass). 30 bats tests in tests/unit/test_raid.bats cover the full enumeration table, every valid/invalid level-vs-count combo from 2 to 5 disks, mixed-size mirror, and unknown-level error paths. make test: 53/53.