Re: Question about doveadm altmove

On Sunday, March 21, 2021 12:16:28 PM AKDT María Arrea wrote:

Hello.

We are running dovecot 2.3.13. Full doveconf -n output below

In 2.3.14 Changelog I found this:

• Remove XZ/LZMA write support. Read support will be removed in future release. We are using mdbox + XZ/LZMA for alternate storage (messages older than 2 weeks are moved to ALT storage via cron job), so we must convert from XZ to another thing (maybe zstd or bz2).

Why can't you just pipe the output of "doveadm altmove" command through an external command to do the XZ/LZMA compression if dovecot no longer supports it internally?

From doveadm-altmove (1):

This command can be used with sdbox or mdbox storage to move mails to alternative storage path when :ALT=<path> is specified for the mail location.

And that's set in stone.

https://en.wikipedia.org/wiki/XZ_Utils

So what are the issues with xz? Security? Crashes or viruses on expanding invalid archives?