DICT Sieve Script Location Type
Description
===========
This location type is used to retrieve Sieve scripts from a Dovecot dict lookup.
Such dictionaries use a file or an SQL database as backend. Refer to the Dovecot
dict documentation for more information on dict lookups.
To retrieve a Sieve script from the dict database, two lookups are performed.
First, the name of the Sieve script is queried from the dict path
`/priv/sieve/name/'. If the Sieve script exists, this yields a data ID
which in turn points to the actual script text. The script text is subsequently
queried from the dict path '/priv/sieve/data/'.
The second query is only necessary when no compiled binary is available or when
the script has changed and needs to be recompiled. The data ID is used to detect
changes in the dict's underlying database. Changing a Sieve script in the
database must be done by first making a new script data item with a new data ID.
Then, the mapping from name to data ID must be changed to point to the new
script text, thereby changing the data ID returned from the name lookup, i.e.
the first query mentioned above. Script binaries compiled from Sieve scripts
contained in a dict database record the data ID. While the data ID contained in
the binary is identical to the one returned from the dict lookup, the binary is
assumed up-to-date. When the returned data ID is different, the new script text
is retrieved using the second query and compiled into a new binary containing
the updated data ID.
Note that, by default, compiled binaries are not stored at all for Sieve scripts
retrieved from a dict database. The bindir= option needs to be specified in the
location specification. Refer to the INSTALL file for more general information
about configuration of script locations.
Configuration
=============
The script location syntax is specified as follows:
location = dict:[;