bug#59423: Invalid 'location' field generated in dovecot configuration

[Maxim Cournoyer <maxim.cournoyer@gmail.com>]

Hi Pierre,

Pierre Langlois <pierre.langlois@gmx.com> writes:

> Hi Guix!
>
> After updating the system, the dovecot service got confused and started
> moving around all mailboxes.  I looked up the configuration and noticed
> strange invalid syntax for the location field:
>
> location=#<<location> file: "path/to/config.scm" line: 297 column: 20>
>
>
> Because the # character is interpreted as a comment, dovecot doesn't
> crash and instead moves mailboxes around in weird ways I don't quite
> understand :-/.
>
> This can actually be reproduced locally with the dovecot system test if
> one dumps the following expression to check the configuration:
>
> (format #t "~a\n" (wait-for-file "/etc/dovecot/dovecot.conf"
>                                  marionette
>                                  #:read 'get-string-all))
>
>
> Giving us the snippets like this in the config:
>
> $ make check-system TESTS="dovecot"  VERBOSE=1
> ...
> namespace inbox {
> type=private
> separator=
> prefix=
> location=#<<location> file: "gnu/tests/mail.scm" line: 297 column: 20>
> inbox=yes
> hidden=no
> list=yes
> subscriptions=yes
> mailbox "Drafts" {
> auto=no
> special_use=\Drafts
> }
> mailbox "Junk" {
> auto=no
> special_use=\Junk
> }
> mailbox "Trash" {
> auto=no
> special_use=\Trash
> }
> mailbox "Sent" {
> auto=no
> special_use=\Sent
> }
> mailbox "Sent Messages" {
> auto=no
> special_use=\Sent
> }
> mailbox "Drafts" {
> auto=no
> special_use=\Drafts
> }
> }

I did:

$ ./pre-inst-env guix system build -e '(@@ (gnu tests mail) %dovecot-os)'
/gnu/store/gpl6g2ia84kc41zma7ik9y4p3kik5aiy-system

Then:

$ guix gc -R /gnu/store/gpl6g2ia84kc41zma7ik9y4p3kik5aiy-system | grep dovecot.conf
/gnu/store/1ijjsm3sj8v0qj88fhlwqxgdszd6q6h7-dovecot.conf

And what I see in this file is now:

--8<---------------cut here---------------start------------->8---
namespace inbox {
type=private
separator=
prefix=
location=
inbox=yes
hidden=no
list=yes
subscriptions=yes
mailbox "Drafts" {
auto=no
special_use=\Drafts
}
mailbox "Junk" {
auto=no
special_use=\Junk
}
mailbox "Trash" {
auto=no
special_use=\Trash
}
mailbox "Sent" {
auto=no
special_use=\Sent
}
mailbox "Sent Messages" {
auto=no
special_use=\Sent
}
mailbox "Drafts" {
auto=no
special_use=\Drafts
}
}
--8<---------------cut here---------------end--------------->8---

Notice that location is empty.  So that's at least different to your
findings, on latest commit.  Can you still reproduce?

Thanks,

Maxim