Viktor Dukhovni via Postfix-users:
> On Tue, Apr 15, 2025 at 08:05:20AM -0400, Wietse Venema via Postfix-users
> wrote:
>
> > [email protected]:
> > > Perhaps $HOME could be set in the environment for the pipe service
> > > command.
> >
> > This is a subtle difference between local(8) and pipe(8).
> >
> > local(8) delivers mail for real users that are required to have a
> > home directory. It exportes HOME and changes directory to $HOME
> > before delivering mail to a command in their .forward file.
> >
> > pipe(8) delivers mail for service accounts that are not required
> > to have their own home directory, for example:
> >
> > postfix:*:1002:1002:postfix:/no/home:/no/shell
> > milter:*:999:999:milter:/no/home:/no/shell
> >
> > pipe(8) already has an explicit 'directory=pathname' argument to
> > specify the execution directory, but it doees not (yet) have an
> > option to specify '{ environment = HOME=/path ...}'.
>
> Wouldn't the below do the trick:
>
> foo unix ... pipe
> -o { export_environment = HOME=/some/where }
> ...
>
> As it should for any Postfix service that forks subprocesses?
Unfortunately, that will destroy the default export_environment
setting with MAIL_CONFIG and perhaps more that is needed to make
pipe-to-command-to-sendmail content filters work.
Other approaches:
-o { export_environment ,= HOME=/some/where ...}
I haven't figured out how to make += etc. syntax work consistenly
in all cases. Minor: does not derive the HOME setting from the
user= attribute.
directory=/some/where
home=/some/where
Makes fully explicit when HOME is exported and when the chdir()
is done. Minor: does not derive the HOME setting from the user=
attribute. On the upside, that gives maximal control over what
happens (element of least surprise).
directory=HOME
Make the value 'HOME' special (take the user= attibute value,
look up their home in the passwd database, then chdir() and
export as HOME).
Ugly, but avoids introducing surprises into EXISTING behavior.
Looks like adding a home= attribute has the least element of surprise.
Wietse
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