Let's make sure we keep track of any file we drop into the system via a database in /var/. This database is implemented based on symlinks, i.e. reuses the fs as a simple database. Given the database most likely will have <= 10 entries only (as we store *patterns* of installed file paths in them, not the file paths themselves), this should be very efficient. For implementation details see comments at top of src/sysupdate/sysupdate-cleanup.c.
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