Unable to activate a Sieve script via ManageSieve

[erosennin]

Hi, I'm migrating my mail server from Debian to nixos-mailserver and it mostly works great! Thanks for the project. :)

The only problem I've faced so far is broken activation of Sieve scripts. I was successfully able to upload a Sieve script with KMail, but trying to activate the scripts results in this error:

managesieve(user@example.com): Error: sieve: file script: Failed to activate Sieve script: symlink(/var/sieve/user@example.com.sieve/default.sieve, /var/empty/.dovecot.sieve) failed: Operation not permitted

I'm using nixos-mailserver-2.0.4 on NixOS 17.09.

Thanks!

[r-raymond]

Hi, thanks for using SNM! I'm hoping @eqyiel has some more insights, since I'm not using custom sieve scripts myself.

The idea is however, that you specify the sieve scripts in your configuration file (see https://github.com/r-raymond/nixos-mailserver/blob/cd9e790f21d26aa6a6588715d18a66a18899b7f6/default.nix#L81) instead of uploading it after deploying the server (the idea being: no state).

Is that something that breaks your workflow?

[erosennin]

Managing Sieve scripts as part of the configuration is great for a personal mail server, but does not really scale to multi-user servers. On a typical mail server, most users do not have root access to the system, but may still want to use custom Sieve scripts.

How about using sieve_default and sieve_default_name options for the script from the configufation file? This way, the script from the configuration will be used by default and the user will be able to override it via ManageSieve, if necessary.

https://wiki2.dovecot.org/Pigeonhole/Sieve/Configuration#Visible_Default_Script

[r-raymond]

That sounds like a good plan. We need to make sure it behaves well with our default script defined via dovecot2.sieveScript and the current custom script implementation. Maybe we can add an option whether to allow users to override sieve scripts?

Do you want to make a PR for this? I could do it too, but I'm a little busy right now and certainly no expert on sieve scripts.

[eqyiel]

@erosennin it would probably be sufficient to just add here: https://github.com/r-raymond/nixos-mailserver/blob/cd9e790f21d26aa6a6588715d18a66a18899b7f6/mail-server/dovecot.nix#L111-L113

plugin {
   sieve = file:~/sieve
   sieve_default = file:/var/sieve/%u.sieve
}

I'd be happy to give it a go if this works for you 👍

[eqyiel]

Don't forget to open port 4190 too, maybe we should make a configuration option for this?

[erosennin]

Thanks, I'll try to make a pull request.