- VPSMGR_STORAGE now accepts btrfs alongside zfs and dir. On a btrfs root the
pool is created as a native subvolume at /var/lib/incus/storage-pools/vpsmgr
(Incus only allows that source path and requires it NOT to pre-exist); on any
other host it becomes a sparse loop-file pool sized exactly like ZFS.
- install.sh asks for an explicit beta confirmation up front when the btrfs
backend is selected (default yes — on a btrfs host there is no ZFS fallback).
Non-interactive installs proceed; non-btrfs/default-zfs installs are
unchanged.
- btrfs swap: on a btrfs root the swapfile is created with
`btrfs filesystem mkswapfile` (btrfs-progs >= 6.1), falling back to
truncate + chattr +C + dd for older tools — the generic fallocate+mkswap path
fails on btrfs (swap must be NODATACOW and preallocated). Non-btrfs hosts
keep the existing fallocate path.
- 00-check.sh installs btrfs-progs and skips the ZFS DKMS/kernel-header
toolchain for btrfs and dir alike; 10-incus.sh verifies the final driver.
- Panel Go code is untouched: container management is storage-driver-
transparent, and lx.EnsureZFSRemoveSnapshots is a no-op off ZFS.
- Docs (architecture, configuration, READMEs, AGENTS) updated for the new
backend, including snapshot-restore semantics (btrfs keeps later snapshots).
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Co-Authored-By: Codebuff <noreply@codebuff.com>
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