On Mon, 22 Jul 2002, Sheldon Hearn wrote:
> Exactly. How do I test the value of the macro, given that it's used as
> a component of a path (to the spool directory, for example)? The only
> thing I can think of is to use expansion in the value for spool_directory,
> and to expand to a syntactically invalid pathname if the default value
> of the macro hasn't been overridden. Syntactically invalid pathnames
> are quite hard to produce. :-)
Here's how to solve your problem:
FOOBAR = unset
pid_file_path = ${if ! eq{FOOBAR}{unset}{}fail}
An empty value = "unset", so it will revert to the default.
Don't use spool_directory. If the expansion fails, Exim will try to
write to the log. Where will it put the log if you haven't set
log_file_path? Er, in the spool directory...
--
Philip Hazel University of Cambridge Computing Service,
ph10@??? Cambridge, England. Phone: +44 1223 334714.
