mddiff - computes diff for maildirs
mddiff [--max-mailno mno] [--db-file dbf]
[-v|--verbose] [-d|--dry-run] [--help] paths
mddiff computes the delta from an old status of a maildir (previously
recorded in a support file, called db file) and the current status,
generating a set of commands (a diff) that a third party software can
apply to synchronize a (eventually remote) copy of the maildir.
If paths is a single file name, and that file is a fifo, mddiff reads
from it file names separated by new line and outputs the sha1 of its
header and body separated by space.
$ mddiff /tmp/fifo_for_mddiff
If paths is a list of directories, mddiff outputs a list of actions a
client has to perform to synchronize a copy of the same maildirs. This
set of actions is relative to a previous status of the maildir stored
in the db file. The input directories are traversed recursively, and
every file encountered inside directories named cur/ and new/ is a
potential mail message (if it contains no \n\n it is skipped).
$ mddiff ~/Mail/
ADD ~/Mail/cur/1239038050.14937_1.garfield:2,S 66532ebb05b252e...
Every client (endpoint using mddiff for synchronization) must use a
different db-file, and the db-file is strictly related with the set of
directories given as arguments, and should not be used with a different
directory set. Adding items to the directory set is safe, while
removing them may not do what you want (delete actions are generated).
mddiff does not alter the dbf file, it generates a new one called
dbf.new. It is up to the higher level tool smd-server(1) to rename
dbf.new to dbf in case the other endpoint successfully applied the
Estimation of max mail message number (default 500000) Decrease
for small systems, it is increased automatically if needed
Name of the cache for the endpoint (default db.txt)
Increase program verbosity (printed on stderr)
Do not generate a new db-file
--help This help screen
mddiff is a low level utility, used by smd-server and smd-client. You
should use higher level tools like smd-pull(1), smd-push(1) and smd-
smd-client(1), smd-server(1), smd-pull(1), smd-push(1), smd-loop(1)
Enrico Tassi <email@example.com>
20 June 2010 mddiff(1)