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A scheduled backup to an unreachable remote now skips (exit 0) instead of erroring, so cron stops logging a failure when the NAS or laptop is offline. Authentication and host-key failures still error loudly, so a genuinely broken backup isn't masked as offline.
The actual backup drops rsync -v for --info=stats1, so the logfile gets a per-run summary instead of every transferred file path. The dryrun stays verbose.
list and status no longer count the latest/ working directory as a snapshot.
Snapshot directories are now read-only beyond the top level (find -type d). Only directories are touched, never the hard-linked files, so permissions don't ripple across snapshots.
Previously-unchecked rotation steps (orphan cleanup, the latest/ touch, the read-only chmod) now warn instead of failing silently. The remote snapshot listing falls back to BSD stat when GNU stat isn't available.
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rsyncshot now acquires an exclusive, non-blocking lock (fd 200) before the backup phase, so a slow backup can't overlap the next cron tick. Only real backups lock. Help, list, status, and dryrun don't, so they're never blocked.
The lock file defaults to /run/lock/rsyncshot.lock, a root-only directory that avoids the symlink-truncation risk of a predictable name in world-writable /tmp. It falls back to /var/lock then /tmp, and is configurable via LOCKFILE. It's deliberately a different file from the old /tmp/rsyncshot.lock cron wrappers, so existing wrapped crontabs keep working until the wrapper is removed.
setup() no longer wraps cron entries in flock, since the script locks itself.
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Refuse to run when REMOTE_PATH or MOUNTDIR is empty or non-absolute. A blank config value otherwise resolves the destination to the filesystem root, where rotation runs rm -rf and --delete.
Run the rotation cp/mv/rm as bare command names in remote mode, resolved by the remote PATH, instead of hardcoded /usr/bin paths that broke on remotes whose binaries live elsewhere. Resolve the real binary via command -v in local mode.
Pass rsync -R so each source is stored under its full path. Two includes sharing a basename (/usr/local/bin and /usr/bin) previously both mapped to latest/bin, and the second sync's --delete wiped the first. This changes the stored layout: /usr/local/bin now lives at latest/usr/local/bin instead of latest/bin. /home and /etc are unchanged.
Add rsync --numeric-ids so /etc and /home ownership survives a restore when the destination has a different passwd/group database.
Match mount points exactly via is_mounted() instead of a substring grep of /proc/mounts, so /media/backup no longer matches /media/backup2, paths compare literally, and mount points with spaces work.
Reject a retention count below 1, which previously still created one snapshot. Drop the grep "|| echo 0" that emitted a stray second line, assemble ssh options as arrays, and quote the RSYNC_RSH identity path.
Extract derive_paths() and is_mounted() as sourceable functions and add unit, rsync-flag, and gated remote-mode test suites. The suite now runs 36 tests, and shellcheck is clean across the script and tests.
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- Add remote mode for SSH-based backups to servers like TrueNAS
- Add SSH_IDENTITY_FILE config for non-root SSH keys
- Add new commands: backup, status, list, dryrun
- Add dependency checks for rsync, ssh, flock
- Add timestamped logging
- Fix: duplicate cron jobs on repeated setup
- Fix: use mktemp for temp files
- Fix: use portable sed instead of grep -oP
- Fix: strengthen input validation with regex anchors
- Fix: handle paths with spaces (newline-separated includes)
- Change license from MIT to GPL v3
- Add automated test suite (25 tests)
- Update README with new features and testing docs
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