Spoolfetch repository format proposal

Format of the storing directory for the spoolfetch implementation. Its design is based on ideas borrowed from Subversion's server storage system.

• There is the file ${spooldir}/README.txt that explains the content of the spooldir directory. It is created when creating the spooldir, and unchanged after.
• A config file ${spooldir}/format that stores versioning & configuration informations for the spooldir.
• The config is stored in the file ${spooldir}/${node}/${plugin}.config
• The values are stored in the file ${spooldir}/${node}/${plugin}.${epoch_mod_N}.data

The ${epoch_mod_N} is the epoch modulo N. It permits to limit inode consumption, while still being able to avoid locking (append-only whole lines), ease cleanup (old files may be pruned easily) & indexed epoch access (just open the correct file and filter it line per line on the epoch stored in it).

File examples

README.txt

This is a Munin Spoolfetch repository.
Do not add, delete, or modify files here unless you know how
to avoid corrupting the repository.

Visit http://munin-monitoring.org/ for more information.

format

Magic: MuninSpoolDir
Version: 1
EpochModulo: 300