Re: [ptxdist] General Ptxdist usecase question

[Michael Olbrich <m.olbrich@pengutronix.de>]

On Fri, Oct 28, 2011 at 12:05:06PM +0200, Erwin Rol wrote:
> On 28-10-2011 11:29, Michael Olbrich wrote:
> >On Fri, Oct 28, 2011 at 10:21:22AM +0200, Erwin Rol wrote:
> >>The projects I use Ptxdist for have grown in size over the last few
> >>years, they now include mono, gtkwebkit, boost, clutter, gtk3 and
> >>all the Xorg stuff. That means it now takes more than 2 hours to
> >>compile it from scratch. The machine is not the fastest (only 4 core
> >>3GHz) but even if it was twice as fast it would still compile over
> >>and hour.
> >>
> >>So I am looking for a way to prevent a full rebuild on every project
> >>release. There seem to be some features in Ptxdist that should allow
> >>this, but I could not really figure out how to use them.
> >>
> >>What I would like to do is this;
> >>
> >>1) Build an OS with all the Xorg, mono, gtk, etc. stuff and version that.
> >
> >This is stable, right? Fix PTXdist version, no option changes etc.?
> 
> Yeah that is the idea. Of course like with any other OS/distribution
> there will be updates at some point.
> 
> >>2) build my own applications.
> >>3) combine the results from step 1 and 2 into an image for flashing
> >>4) goto 2
> >>
> >>Is it possible to do this with Ptxdist and if so, how ?
> >
> >Take a look at the PROJECT_CREATE_DEVPKGS/PROJECT_USE_DEVPKGS options. With
> >PROJECT_CREATE_DEVPKGS you get<pkg>->version>-<hash>-dev.tar.gz for most
> >packages. This is the content of<PKG>_PKGDIR.
> >With PROJECT_USE_DEVPKGS you can specify a folder contain such archives. If
> >a matching archive is found, the stages up to install are skipped and the
> >archive is extracted instead. The hash makes sure the sub-options used to
> >create the archive are the correct ones.
> >Note: You cannot use your own packages dir. That introduces really strange
> >circular dependencies.
> 
> I looked into that a bit, but my problem are the configuration
> files. If I understand the idea correct you start with two exactly
> the same setups (same ptxdistconfig and pladformconfig) and than say
> the first setup should "create packages" and the second setup should
> "use packages".
> 
> Is it possible to somehow "reference" to the prebuild system and
> prevent the user from changing the settings that are in common with
> that prebuild system?

No, but if you change an option, then the affected package is built again
instead of using the pre-built archive. You won't get a broken system,
you'll just rebuild more.

Michael

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

-- 
ptxdist mailing list
ptxdist@pengutronix.de