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archsetup took sanoid from install-archzfs but never ported the pre-pacman snapshot hook, so a ZFS-root install had no transaction-triggered rollback point — the working setup only existed as a hand-placed script on velox, lost on reinstall. Add configure_pre_pacman_snapshots(): a PreTransaction pacman hook plus a self-pruning script that keeps the 10 most recent pre-pacman snapshots (sanoid ignores them — they aren't autosnap_ names). It's gated to ZFS-root and runs late in boot_ux, so the hook doesn't fire during the install's own package operations and the first snapshot is the fresh system.
The script ships as scripts/zfs-pre-snapshot, made ZFS_PRE_* env-overridable so the pruning logic is unit-testable. Unit tests drive it against a fake zfs (creates a snapshot, prunes the oldest past KEEP, ignores non-pre-pacman snapshots, honors the lockfile interval, warns on failure); a Testinfra test asserts the hook and script land on a ZFS install; the orchestrator test pins the new boot_ux substep.
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The Testinfra boot and backup checks asserted btrfs behavior unconditionally, so they failed on a ZFS root once the ZFS VM path started running them. ZFS boots via ZFSBootMenu, not GRUB. archsetup skips the systemd-hook switch and the mkinitcpio rebuild on ZFS, and on a ZFS+virtio VM it never edits mkinitcpio.conf at all. Branch each check on the existing zfs_root/has_nvme fixtures: assert the ZFSBootMenu EFI binary on ZFS (GRUB on btrfs), gate the mkinitcpio.conf backup on archsetup actually editing the file, and check the console font in /etc/vconsole.conf on ZFS (the initramfs on non-ZFS).
Surfaced by the first full ZFS VM run, which completed archsetup cleanly (exit 0). These were the only 3 failures.
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VM run #2 exposed two test bugs (archsetup itself passed clean, 53/0/0):
- ScopeMismatch errors on 26 tests: the host-dependent fixtures were
session-scoped, but Testinfra's host fixture is module-scoped, and a
session fixture cannot request a module one. Drop those fixtures to
module scope.
- test_console_font_in_initramfs hardcoded /boot/initramfs-linux.img; this
fleet runs linux-lts, so the image is initramfs-linux-lts.img. Pick the
main (non-fallback) initramfs by glob instead.
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Port all ~26 post-install checks from validation.sh to pytest/Testinfra,
reaching parity before the cutover. Adds test_users, test_packages,
test_services, test_desktop, test_boot, test_keyring, and test_archsetup
(88 tests after parametrizing groups, services, timers, tools, and configs),
plus shared conftest fixtures for ZFS/NVMe/compositor/networking gating.
The shell sweep's three outcomes map cleanly: hard failures become assertions,
advisory warnings and unmet preconditions (headless compositor, slirp
networking, optional services, non-ZFS/non-NVMe hosts) become skips.
One correctness fix vs the shell sweep: check awww, not swww — archsetup
installs awww (swww's successor) and `pacman -Q swww` no longer matches.
Verified on the host: py_compile clean, pytest --collect-only green (88 tests).
The sweep against a real VM is verified by the make test run that follows.
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