Time Machine–style rsync snapshots for Linux — hardlinked and space-cheap https://git.cjennings.net/rsyncshot/atom?h=main 2026-06-25T05:37:41+00:00 2026-06-25T05:37:41+00:00 Craig Jennings c@cjennings.net 2026-06-25T05:37:41+00:00 urn:sha1:8f351ae4d14fc2abcc83716a192dfacff6dc65ef 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.