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Mailing List Message of <rpm-users>

Re: RPM5 and YML-like Specfiles

From: Eric MSP Veith <eveith@wwweb-library.net>
Date: Sun 10 May 2009 - 21:45:26 CEST
Message-Id: <200905102145.29907.eveith@wwweb-library.net>
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Jeff,

thanks for your comprehensive reply.

About the "mistaken" part (I should have explained myself better here): I 
got the impression that a YML-like formatting of the spec files is one of 
the next steps in RPM evolution. Since I pretty much like RPM, I decided to 
go with that and tried to apply YML formatting rules to my spec files. "Am I 
mistaken" just meant "did I get the wrong impression about the direction of 
RPM spec file markup development?" :-)

		-- Eric

On Sunday 10 May 2009, Jeff Johnson <n3npq@mac.com> wrote:
> On May 10, 2009, at 3:19 PM, Eric MSP Veith wrote:
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> >
> > Hello,
> >
> > since a while rpm supports spec files that do not only look like
> > YAML files,
> > but indeed are. At least as far as I know.
> >
> > %prep
> > %setup -q
> >
> > Becomes:
> >
> > %prep
> >    %setup -q
> >
> > ... with proper indentation.
>
> FYi: Try
> 	rpm -qp --yaml foo*.src.rpm
> or
> 	rpm -qp --yaml --specfile foo.spec
> for as close as rpm has come to YAMLspec!
>
> Yes, the indentation could be automated.
>
> > I've been trying to adopt this to my own projects. (I actually just
> > began
> > re-formatting my old specfiles.) What I found out is that it really
> > works in
> > the script parts, a thing that broke the spec file parser before.
> > However,
> > the description part still doesn't seem to get it, or I am making
> > mistakes.
> > When I write something like:
> >
> > %description
> >    This is some indented text for this package.
> >    It shouldn't look like this when using "rpm -qi PKG".
> >
> > The description is indented, too, when I run "rpm -qi PKG". While I
> > understand that there's no good way to have YML-like indentation *and*
> > preserve text formatting that might have been done in the
> > description part,
> > I long for a real YML-ish look of my spec files. :-)
> >
> > Is there any way to do it right?
>
> With markup like XML/YAML, "right" is pretty much an aesthetic
> rather than engineering POV.
>
> But what is rate-limiting for RPM + YAML is the bikeshed discussions re
> what is "aesthetic" and what is "ugly".
>
> For example, I'm actively (for 9+ months) shopping
> markup that captures the same information as what
> is permitted in %trigger* sections in spec files.
>
> The trigger sections include multiple dependencies, as well
> as the usual -p and -n scriptlet flags, so example YAML markup
> for %triggers would generalize to all spec file sections rather
> quickly and easily.
>
> So if you are inclined, take a stab at example YAML markup
> for %trigger* sections, and send along please. I'll take a stab at
> a proof-of-concept parser for the markup using /etc/rpm/sysinfo/
> Triggername.
>
> If/when I'm able to fire triggers from external configuration, then
> its time to start on the larger job of alternatives to *.spec file
> syntax.
> Note that the same YAML parser and markup would be used for both
> externally configured triggers and spec file parsing (in case the
> connection is not obvious).
>
> > Or am I perhaps totally mistaken regarding the YML thing?
>
> Not sure what "mistaken" means, since there has been almost
> no discussion about RPM + YAML.
>
> But IMHO, YAML is data focussed and human readable markup,
> very much not true for XML (which is syntax focussed) or JSON
> (which is hardly human readable, its just fancy CSV in most usage
> cases I've seen).
>
> Note that syck was re-added (it was in rpm-4.4.9 but too fragile
> and flimsy to carry forward to @rpm5.org) last month. syck adds
> a YAML parser to rpm, so far all the --yaml spewage is just
> fprintf's.
>
> hth
>
> 73 de Jeff
> ______________________________________________________________________
> RPM Package Manager                                    http://rpm5.org
> User Communication List                             rpm-users@rpm5.org

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Received on Sun May 10 21:46:02 2009
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