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A/B boot via systemd-boot boot counting on generation BLS entries. The newest generation's entry gets a +N-0 suffix. If the health check fails after N attempts, systemd-boot falls back to the previous proven generation. No special partition layout or slot abstraction. /run/booted-system and /run/current-system already provide A/B semantics — the immutable Nix store guarantees both closures remain available. Also cleans up nixpkgs leftovers from systemd-boot-builder.py (copyExtraFiles, checkMountpoints, bootspecTools stubs; fixes rebootForBitlocker always being truthy).
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jonringer
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Sep 10, 2026
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| boot_json_str = run( | ||
| [ | ||
| f"{BOOTSPEC_TOOLS}/bin/synthesize", | ||
| "--version", | ||
| "1", | ||
| system_directory, | ||
| "/dev/stdout", | ||
| ], | ||
| stdout=subprocess.PIPE, | ||
| ).stdout |
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this was a stop gap for when boot.spec was introduced, since we don't have any computers installing ekaos on baremetal as of yet, we don't need it.
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| machine.succeed("systemctl cat ekaos-bless-boot.service") | ||
| machine.wait_for_unit("ekaos-bless-boot.service") |
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only really asserts the blessed behavior, we should attempt a new working generation and reboot. Then also tests a failing generation and fallback workflow.
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A/B boot via systemd-boot boot counting on existing generation BLS entries. The newest generation's entry gets a +N-0 suffix. If the health check fails after N boot attempts, systemd-boot falls back to the previous proven generation.
No new partition layout, no slot abstraction, no update tool. /run/booted-system and /run/current-system already provide the A/B semantics — the immutable Nix store guarantees both closures remain available.