[Pm-utils] Migrating suspend quirks away from hal

[Victor Lowther]

On Thu, Nov 26, 2009 at 11:05 AM, Dan Nicholson <dbn.lists at gmail.com> wrote:

> On Wed, Nov 25, 2009 at 6:43 AM, Victor Lowther
> <victor.lowther at gmail.com> wrote:
> > On Wed, Nov 25, 2009 at 6:10 AM, Martin Pitt <martin.pitt at ubuntu.com>
> wrote:
> >>
> >> Hello Victor,
> >>
> >> sorry for the late response; conference and all that..
> >>
> >> Victor Lowther [2009-11-15 21:59 -0600]:
> >> > And now, a version that actaully works.  With a bit of glue code, this
> >> > can replace auto quirk and smart kernel driver handling in pm-utils.
> >>
> >> I just tried your script, but AFAIK it just figures out the quirks
> >> that are necessary on the _current_ system by parsing the .fdi
> >> directly, right?
> >
> > No, it translates the .fdi files that are currently on the system into a
> > native format that uses bash-style extended regular expressions instead
> of
> > the .fdi ad-hoc pattern matching scheme..  The translation is fairly
> > simplistic right now (and could certainly do with being rewritten, in a
> > language that acctually understands xml) but it only reads the .fdi files
> to
> > translate them, and it only does that if they are newer than the native
> > format files.  If there are no .fdi files, or they are older than the
> native
> > ones, it just uses the native format files.
> >
> > Take a look at maybe_update_native(), translate_xml() and their callers
> in
> > the script for more details.
> >
> >>
> >> What I actually had in mind was that we should do a static conversion
> >> to produce a simple-to-parse text file map which can then be put into,
> >> and maintained within (well, it's not going to change often any more),
> >> pm-utils itself, so that we can get rid of hal/hal-info completely.
> >>
> >> Would you want to change your script accordingly, or want me to work
> >> on such a static conversion script?
> >
> > No need, I already do that in the current script for convienence.  Once
> we
> > actually decide that this is the way forward, moving the XML translation
> > into its own script or rewriting it in a language that actually
> understands
> > XML will be pretty easy.
> >
> >>
> >> I thought about having one file per vendor, such as
> >>
> >>  /usr/share/pm-utils/video-quirks/ibm
> >
> > I already do this.
> >
> >>
> >> and each file would have a list of (dmi property:value)* → quirks map
> like
> >>
> >>  product_name:.*X31;bios-version:INET17WW      s3_bios s3_mode
> >>
> >> which can then be matched against /sys/class/dmi/id/* with grep.
> >
> > I tried that, it is hideously expensive -- you end up having to parse
> each
> > line in the file in the shell, and then run grep on the specific DMI
> > property you are looking at with the bits you parse out, which ends up
> > running grep several hundred times. Since bash already knows about
> regular
> > expressions, I cut out the middleman, and keeping the current treeish
> > structure makes it easier to save a little time by not comparing the bits
> > you do not actually care about.
>
> I think if this is really the way to go, then shell is not the right
> tool for the job at runtime. You could write a trivial C program to
> parse that out and spit out the quirks on stdout for pm-utils to use.
> Bash is great, but it is not the right tool for all jobs.
>

I think bash works great for this little task. :)


> --
> Dan
>
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