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

[Pierre Langlois <pierre.langlois@gmx.com>]

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Maxim Cournoyer <maxim.cournoyer@gmail.com> writes:

> 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

<sidetrack/>

Oh that's a nice way of doing this, better than my hack to print the
config, I'll have to remember the `guix gc -R' flag.

>
> And what I see in this file is now:
>
> 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
> }
> }
>
> Notice that location is empty.  So that's at least different to your
> findings, on latest commit.  Can you still reproduce?

Yeah I'm afraid I still see the same issue after a `git pull` just now:

--8<---------------cut here---------------start------------->8---
~/code/guix [env]$ ./pre-inst-env guix system build -e '(@@ (gnu tests mail) %dovecot-os)'
/gnu/store/ayfvf5s561q955kv8wrkklrvq3ga3qpy-system
~/code/guix [env]$ guix gc -R /gnu/store/ayfvf5s561q955kv8wrkklrvq3ga3qpy-system | grep dovecot\.conf | xargs grep "^location"
location=#<<location> file: "gnu/tests/mail.scm" line: 297 column: 20>
--8<---------------cut here---------------end--------------->8---

Have you tried to rebuild from scratch, after a `make clean-go'? When
first bisecting this, I was working from the git repo and couldn't
reproduce the bug. Then it worked by using `guix time-machine' to bisect
rather than work from git.

So I'm guessing the change being in a macro, there could be residue .go
files that need recompiling?

Thanks,
Pierre

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