Changelog

All notable changes to add_subvolumes are documented in this file.

The project follows Semantic Versioning.

[2.1.0] - 2026-09-23

Busy paths now try systemd blocker discovery from open process IDs first, then applicable known activator rules, before falling back to active-data consent or SKIP / Reboot and retry. Dry-run reports a discovered mitigation; execution rechecks, temporarily stops and restores services, and verifies that the path is quiet.
Post-commit cleanup now reports a busy old backup as retained for manual review without contradictory recovery or no-reboot instructions. Pre-commit activity still requires recovery.

Repeated the initial migration and later /var/lib/bootprep adoption on Debian, Kubuntu, TUXEDO OS, Manjaro, CachyOS, and EndeavourOS; all six systems passed.

Added explicit --dryrun and --execute modes, with --accept for exact paths configured to permit an active-data risk decision.
Added restricted parsing for root, home, and JSON activity-policy configuration without sourcing configuration as shell code.
Added exact-path policies for accepted active-data risk, managed services and activators, and ignored runtime sockets.
Added recoverable transaction state, original-fstab preservation, and interrupted-run protection.
Added support for stable root discovery from a nested snapshot, nonstandard root-subvolume names, and a separate Btrfs home filesystem.
Added package discovery guidance for missing tools on Debian- and Arch-based systems.
Added automated coverage for migration, policies, activity handling, mount options, tool discovery, recovery, and runtime files.

Rebuilt the migration engine in embedded Python while retaining a self-contained Bash launcher.
Preserved exact target-path Btrfs mounts and existing administrator mount-option choices.
Added atomic fstab staging and commit with concurrent-edit detection.
Strengthened data preservation with checksum comparison, ACL and extended-attribute handling, internal hard-link preservation, and refusal of external hard links.
Refused unsafe symlink ancestors, nested storage, ambiguous mounts, and incomplete activity inspection.
Made post-commit backup cleanup best effort per path. A busy or failed cleanup retains only the affected backup and does not turn a committed migration into a recovery-required transaction.
Moved /opt from the default core set to the optional vendor-software examples and added /var/lib/bootprep as an optional target.

Completed both add_subvolumes regression stages on Debian, Kubuntu, TUXEDO OS, Manjaro, CachyOS, and EndeavourOS: initial configured migration and later /var/lib/bootprep adoption.

Preserved exact configured target paths already mounted as independent Btrfs subvolumes.
Regression-tested the independent-mount compatibility fix on Debian and CachyOS.