On Fri, Dec 26, 2025 at 08:46:46PM -0500, Wietse Venema via Postfix-users wrote:
> > Basically after installing a new Postfix, always run "make" in the
> > primary configuration directory (perhaps also in any additional
> > instance directories that have a Makefile).
>
> How would this automate the migration from one default database
> type to another? As a start one would replace hard-coded "local
> file" database types in main.cf and master.cf with parameterized
> types.
If, as I do, a user is writing tables in a form such as:
indexed = ${default_database_type}:${config_directory}/
virtual_alias_maps = ${indexed}virtual
then a change of the default database type does not require changes to
main.cf, beyond perhaps:
postconf -e "default_database_type = lmdb"
if and only if "postconf -xh default_database_type" returns a no longer
available driver. In other words some indirection in main.cf is needed
to support future changes.
Af for the Makefile, making the suffix dependent on the default database
type is a bit tricky, "postconf" does not currently report the file
suffix associated with the default database type, so one would
need (GNU make) shell code fragments like:
CMDDIR := ${shell postconf -xh command_directory}
DBTYPE := ${shell postconf -xh default_database_type}
DBEXT := ${shell case $(DBTYPE) in \
cdb) echo .cdb;; \
lmdb) echo .lmdb;; \
hash|btree) echo .db;; \
*) exit 1;; \
esac}
.SUFFIXES: $(DBEXT)
aliases$(DBEXT): aliases
$(CMDDIR)/postalias $(DBTYPE):$<
%$(DBEXT): %
$(CMDDIR)/postmap $(DBTYPE):$<
...
to set the default suffix in the Makefile. Some determined effort is
required to ensure ongoing maintainability.
--
Viktor. 🇺🇦 Слава Україні!
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