I converted an ikiwiki setup file to YAML as
[[documented|tips/yaml_setup_files]].

On my Debian Squeeze system, attempting to build the wiki using the
YAML setup file triggers the following error message:

	YAML::XS::Load Error: The problem:

	    Invalid trailing UTF-8 octet

	was found at document: 0
	usage: ikiwiki [options] source dest
	       ikiwiki --setup configfile

Indeed, my setup file contains UTF-8 characters.

Deinstalling YAML::XS ([[!debpkg libyaml-libyaml-perl]]) resolves this
issue. According to YAML::Any's POD, YAML::Syck is used instead of
YAML::XS in this case since it's the best YAML implementaion available
on my system.

No encoding-related setting is mentionned in YAML::XS' POD. We may
consider there is a bug in there. I'll see if it's known / fixed
somewhere as soon as I get online.

Joey, as a (hopefully) temporary workaround, what do you think of
explicitely using YAML::Syck (or whatever other YAML implementation
that does not expose this bug) rather than letting YAML::Any pick its
preferred one?

--[[intrigeri]]

> Upgrading YAML::XS ([[!debpkg libyaml-libyaml-perl]]) to current sid
> version (0.34-1) fixes this bug for me. --[[intrigeri]]

>> libyaml-syck-perl's description mentions that the module is now
>> deprecated. (I had to do some ugly workaround to make unicode work with
>> Syck earlier.) So it appears the new YAML::Xs is the
>> way to go longterm, and presumably YAML::Any will start depending on it
>> in due course? --[[Joey]]

>>> Right. Since this bug is fixed in current testing/sid, only
>>> Squeeze needs to be taken care of. As far as Debian Squeeze is
>>> concerned, I see two ways out of the current buggy situation:
>>>
>>> 1. Add `Conflicts: libyaml-libyaml-perl (< 0.34-1~)` to the
>>>    ikiwiki packages uploaded to stable and squeeze-backports.
>>>    Additionally uploading the newer, fixed `libyaml-libyaml-perl`
>>>    to squeeze-backports would make the resulting situation a bit
>>>    easier to deal with from the Debian stable user point of view.
>>> 2. Patch the ikiwiki packages uploaded to stable and
>>>    squeeze-backports:
>>>    - either to workaround the bug by explicitly using YAML::Syck
>>>      (yeah, it's deprecated, but it's Debian stable)
>>>    - or to make the bug easier to workaround by the user, e.g. by
>>>      warning her of possible problems in case YAML::Any has chosen
>>>      YAML::XS as its preferred implementation (the
>>>      `YAML::Any->implementation` module method can come in handy
>>>      in this case).
>>>
>>> I tend to prefer the first aforementioned solution, but any of
>>> these will anyway be kinda ugly, so...