Re: Debian switchable MTA mechanism
On Wed, Feb 17, 2021 at 07:39:15AM +0800, Kevin Shell wrote:
> On Tue, Feb 16, 2021 at 04:38:06PM -0600, David Wright wrote:
> > On Tue 16 Feb 2021 at 17:48:25 (+0800), Kevin Shell wrote:
> >
> [...]
> > > Isn't Debian already has a /etc/alternatives/ mechanism?
> >
> > AIUI all the targets of /etc/alternatives are all installed at the
> > same time, and can be simultaneously run without conflicting with
> > each other. The links merely select which target is run (and
> > documented) by invoking a name, like "www-browser" (→ lynx for me),
> > "awk" (gawk) or "rename" (the Perl one). I might be running firefox,
> > mawk and rename.ul (by their specific name) at the same time as the
> > "default" versions.
> >
>
> I asked this question because on my laptop there's an alternatives system
> that can keep several programs providing the same or similar functions
> at the same time.
> Debian also has an alternatives system but doesn't allowed to install
> multiple MTAs.
>
> https://github.com/fedora-sysv/chkconfig/blob/master/alternatives.c
> $ dnf info alternatives
> Name : alternatives
> Summary : A tool to maintain symbolic links determining default commands
> URL : https://github.com/fedora-sysv/chkconfig
> License : GPLv2
> Description : alternatives creates, removes, maintains and displays information about
> : the symbolic links comprising the alternatives system. It is possible
> : for several programs fulfilling the same or similar functions to be
> : installed on a single system at the same time.
>
>
>
besides BSD systems also have a similar system call mailwrapper
http://man.openbsd.org/mailwrapper.8
--
kevin
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