Add support for the --clean (-C) flag to remove files and directories
older than the age specified in tmpfiles.d configuration entries.
The age field (6th column) in tmpfiles.d entries can now be used with
'd', 'D', and 'e' type entries to clean up old files. Supported time
suffixes are: s (seconds), m (minutes), h (hours), d (days), w (weeks).
Example configuration:
d /tmp/cache 0755 root root 10d
When run with --clean, files in /tmp/cache older than 10 days will be
removed. The directory itself is preserved.
Uses a conservative cleanup approach matching systemd-tmpfiles:
- Files: kept if ANY of atime, ctime, mtime is recent
- Directories: kept if ANY of atime, mtime is recent (ctime excluded
because cleanup itself updates directory ctime)
A value of "-" or "0" for age disables cleanup for that entry.
Note: x/X exclusion patterns are recognized but not yet implemented.
Aaron Andersen
0b8d39329a