[Linux-ha-dev] [mgmt]Rewriting order and colocation configurations

[Alan Robertson]

Lars Marowsky-Bree wrote:
> On 2007-12-09T02:50:52, Yan Gao <ygao at novell.com> wrote:
> 
>>>> Thanks! It's a good tool. By now, haclient doesn't generate a xml file.
>> Ideally, haclient should generate a valid xml, and then transfer to
>> mgmtd. Xinwei and I think that the current protocol is too complicated
>> and has many limitations. We want to simplify the protocol and improve
>> the applicability so that it's convenient to implement full features
>> according to the dtd.
> 
> Right; the client very likely should directly talk to the CIB daemon.
> (Which already supports this; we may need a way to apply ACLs in the
> future though.)
> 
> You're preaching to the choir ;-)
> 
>>> I have extended the metadata to explicitly include enumeration values. 
>>> I think this would help a lot for the kinds of validations I think 
>>> you're doing.
>> In my implementation,I've adopted the enumeration values specified in
>> the dtd to be used for the list of combobox options.
> 
> It is quite possible that a DTD is not powerful enough to adequately
> describe the syntax and semantics of the CIB. The DTD is, simply put,
> the oldest and least complex schema format for XML, and happened to be
> what I knew when I conjured up the original one ;-)
> 
> XML Schema, Relax NG (or others I know even less about) may be more
> appropriate standards to describe the CIB as we have it today, and as it
> evolves further.
> 
> This may be preferable to needing to duplicate this in home-grown
> fashion. A lint-like tool is still a good idea, but it should be build
> on top of this, IMHO.

/me redirects this whining into /dev/null

Feel free to investigate the best tools, define the DTD-replacement, and 
get Andrew to adopt it - incorporating it into crm_verify.  "Show me the 
code" is the Linux way after all...

If it has python support, likely all I'll have to do to use it is import 
a few more python classes at the top, and add a half-dozen lines to 
ciblint to read in the DTD-replacement, and call its validation function.

When all is said and done, it won't eliminate more than a few hundred 
lines of code in ciblint (which is now more than 2K lines and still 
growing).

-- 
     Alan Robertson <alanr at unix.sh>

"Openness is the foundation and preservative of friendship...  Let me 
claim from you at all times your undisguised opinions." - William 
Wilberforce