I have never tried to do it myself so I can only guess at the best way but I think I'd do something like this:

Get a fresh install of Roundcube on the server (https://github.com/roundcube/roundcubemail/blob/master/INSTALL#L33) and copy over the relevant parts of config.inc.php and any configs in the plugins dir that i want (note, i see you have a couple of db config files, i'm not sure what those are but may be they have info which should be in my config.inc.php)

also I suppose, just in case, have a look at this announcement, there were some config changes with the release of 1.6 https://roundcube.net/news/2022/07/28/roundcube-1.6.0-released

next there is an updatedb.sh utility shipped with Roundcube https://github.com/roundcube/roundcubemail/blob/master/UPGRADING#L97 so I'd use this to bring the db schema up to date.

then I might enable the installer just because its an easy way to check everything its ok.

Hello,

I'm using Debian Bookworm, so that's Roundcube 1.6.5 now. I use the managesieve plugin to filter messages and in general it works. However, I have a question regarding the creation of rules with value comparisons in Roundcube:

Exim4 adds a header X-Spam_score with a the spam score of the message (multiplied by ten, as an integer value) and I want to use this value to filter spam messages. I attach a screenshot of the rule I created in Roundcube ("screenshot.png"), it results in the following:

# rule:[Spam-Filter]
if allof (header :value "gt" "x-spam_score" "60")
{
   fileinto "Junk";
}

This filter doesn't work. As I understand it this leads to a comparison between strings. And everywhere I look I find sieve scripts using a sieve extension comparator-i;ascii-numeric which is required to be able to use a :comparator "i;ascii-numeric", so that those strings are interpreted as decimal positive integers… Since Roundcube offers comparisions between values I guess it should be possible without this extension… :/ What am I doing wrong?

This depends how you are storing your user information. Roundcube support LDAP address books for example. You could also make your own address book plugin which can pull information from what ever source you are using.

Is there a way to tell roundcube to display all IMAP folders instead of the user having to go into settings and subscribe?

Have a look at the subscriptions_option plugin shipped with Roundcube, this enables or disables the use of imap subscriptions.

By the way, assuming your IMAP server supports it, you might want to look at the special-use IMAP extension. With this the IMAP server tells the client which folders to use for junk, deleted etc rather than them creating their own and means the behaviour is the same across different cleints.

I recently upgraded from 1.4.13 to 16.6 and have run into multiple problems.

One issue I am still struggling with that I may have forced it to work is running /installer/. The installto.sh script told me that I must first run the /installer/. When I run it (still) I get a blank config instead of using my current configuration. I was able to get it to run by running the bin/update.sh script after setting the ROUNDCUBE_CONFIG_DIR environment variable to point to /etc/roundcube. This completed the database upgrade and all appears to work.

Ubuntu 20.04

So my question is, how does config work within Roundcube?

I see there is:
 - ROUNDCUBE_CONFIG_DIR environment variable
 - RCMAIL_CONFIG_DIR PHP variable
 - RCUBE_CONFIG_DIR variable

I also see the following directories:
 - /etc/roundcube
 - /var/lib/roundcube/config (--> /etc/roundcube)
 - /usr/share/roundcube/config

So, who is config setup in the following?
 - Running standard roundcube /roundcube/
 - Running installer /roundcube/installer/
 - Running from command line (e.g., bin/installto.sh)