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

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

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

> [[PGP Signed Part:Undecided]]
>
> 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:
>
> ~/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>
>
> 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?

Oh, I just realized the change was reverted with
44554e7133aa60e1b453436be1e80394189cabd9, then I'm probably the one who
needs to do a `make clean-go' :-).

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