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References: <5978ee28-12b8-fb4e-4467-604a31f34312@youngman.org.uk>
In-Reply-To: <5978ee28-12b8-fb4e-4467-604a31f34312@youngman.org.uk>
From: John Blinka <john.blinka@gmail.com>
Date: Sun, 27 Nov 2022 08:21:22 -0500
Message-ID: <CAC_tCmqMuG_gvtnLm3r62BUnZdVijOCnezXvB_6XybBMOeL1og@mail.gmail.com>
Subject: Re: [gentoo-user] Postfix config and update
To: gentoo-user@lists.gentoo.org
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On Sun, Nov 27, 2022 at 5:36 AM Wols Lists <antlists@youngman.org.uk> wrote=
:
> I've just had emerge telling me it wants to trash my postfix config :-)
>
> I'm not sure whether my setup is actually using it, I use dovecot to
> deliver my mail, but is there any way I can stop random updates trying
> to trash my local changes? I'm rubbish at merging updates, and last time
> I tried I think the result was a complete mess.
>
> And I said I use dovecot to deliver mail - that takes a leaf out of the
> systemd book and has a master config file pointing to a local config
> file. Any updates to dovecot don't touch the local file, and don't touch
> my local settings.
>
> Can I do anything similar for postfix?
>
> Cheers,
> Wol
>
> I=E2=80=99m not a systemd user, so I don=E2=80=99t know precisely what sy=
stemd does. But
my /etc/postfix/main.cf is a soft link to =E2=80=9Cmain.cf.works=E2=80=9D, =
which was an
unoriginal name for an experimental config file that worked (as opposed to
a series of trial configs that didn=E2=80=99t). The original main.cf is ren=
amed
main.cf.orig to keep it around as an unadulterated reference. Works for me
and doesn=E2=80=99t get clobbered in updates.
If I change any config file I usually rename it with a .orig suffix, alter
a copy of the original, and point to the altered copy with a soft link. The
soft link has the standard config file name. The altered copy has a name
different from anything expected by the installation. The soft link allows
me to try a bunch of different configs as I=E2=80=99m tuning the applicatio=
n.
Haven=E2=80=99t lost any custom configurations doing this, it makes my own
modifications abundantly clear, and it keeps an original around for when I
make a mess of my customizations. A quick diff between the .orig file and
any ._cfg files after an update shows me what=E2=80=99s changed in the upda=
te.
There are portage file merging tools for config updates, but I don=E2=80=99=
t use
them often enough to use them properly. So I=E2=80=99ve reverted to this si=
mple
minded system. And backups!
HTH
John
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<div><br></div><div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=
=3D"gmail_attr">On Sun, Nov 27, 2022 at 5:36 AM Wols Lists <<a href=3D"m=
ailto:antlists@youngman.org.uk">antlists@youngman.org.uk</a>> wrote:<br>=
</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;b=
order-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-c=
olor:rgb(204,204,204)">I've just had emerge telling me it wants to tras=
h my postfix config :-)<br>
<br>
I'm not sure whether my setup is actually using it, I use dovecot to <b=
r>
deliver my mail, but is there any way I can stop random updates trying <br>
to trash my local changes? I'm rubbish at merging updates, and last tim=
e <br>
I tried I think the result was a complete mess.<br>
<br>
And I said I use dovecot to deliver mail - that takes a leaf out of the <br=
>
systemd book and has a master config file pointing to a local config <br>
file. Any updates to dovecot don't touch the local file, and don't =
touch <br>
my local settings.<br>
<br>
Can I do anything similar for postfix?<br>
<br>
Cheers,<br>
Wol<br>
<br>
</blockquote></div></div>I=E2=80=99m not a systemd user, so I don=E2=80=99t=
know precisely what systemd does. But my /etc/postfix/<a href=3D"http://ma=
in.cf">main.cf</a> is a soft link to =E2=80=9Cmain.cf.works=E2=80=9D, which=
was an unoriginal name for an experimental config file that worked (as opp=
osed to a series of trial configs that didn=E2=80=99t). The original <a hre=
f=3D"http://main.cf">main.cf</a> is renamed main.cf.orig to keep it around =
as an unadulterated reference. Works for me and doesn=E2=80=99t get clobber=
ed in updates.<div dir=3D"auto"><br></div><div dir=3D"auto">If I change any=
config file I usually rename it with a .orig suffix, alter a copy of the o=
riginal, and point to the altered copy with a soft link. The soft link has =
the standard config file name. The altered copy has a name different from a=
nything expected by the installation. The soft link allows me to try a bunc=
h of different configs as I=E2=80=99m tuning the application.</div><div dir=
=3D"auto"><br></div><div dir=3D"auto">Haven=E2=80=99t lost any custom confi=
gurations doing this, it makes my own modifications abundantly clear, and i=
t keeps an original around for when I make a mess of my customizations. A q=
uick diff between the .orig file and any ._cfg files after an update shows =
me what=E2=80=99s changed in the update.</div><div dir=3D"auto"><br></div><=
div dir=3D"auto">There are portage file merging tools for config updates, b=
ut I don=E2=80=99t use them often enough to use them properly. So I=E2=80=
=99ve reverted to this simple minded system. And backups!</div><div dir=3D"=
auto"><br></div><div dir=3D"auto">HTH</div><div dir=3D"auto"><br></div><div=
dir=3D"auto">John</div>
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