[cdt-dev] FW: Building with Maven

["Schaefer, Doug" <Doug.Schaefer@xxxxxxxxxxxxx>]

D'oh. Again.

-----Original Message-----
From: Schaefer, Doug 
Sent: Wednesday, September 28, 2011 12:57 PM
To: 'Vladimir Prus'
Subject: RE: [cdt-dev] Building with Maven

> -----Original Message-----
> From: Vladimir Prus [mailto:vladimir@xxxxxxxxxxxxxxxx]
> Sent: Wednesday, September 28, 2011 12:25 PM
> To: Schaefer, Doug; cdt-dev@xxxxxxxxxxx
> Subject: Re: [cdt-dev] Building with Maven
> 
> On Wednesday, September 28, 2011 18:55:36 Schaefer, Doug wrote:
> > Reproducibility of maven builds is a hot topic in the community right now.
> > Freezing .m2 is a common approach that's being proposed.
> 
> Oh, so there's no official approach right now? Ehm.

No. There's never been anything really official about Eclipse releng to begin with. Vendors who redistribute Eclipse generally deal with these requirements in their own way. And given the promise of API stability, I'm not sure how large of an affect we're talking about here.

> > Another option is to create a local mirror of the dependencies for 
> > CDT and set the properties listed in the top level pom.xml file to 
> > point at them instead of the default. It's pretty easy to create p2 
> > mirrors these days (google for it). And use -D on the mvn command 
> > line to override the properties.
> 
> I imagine this will work, but having maven "download" things from 
> file:// repository sounds like a way to slow down already slow down 
> build :-(

Not sure I get you. file:// should be pretty fast since it doesn't go over a network connection. And I'm not sure I'd characterize the builds as slow. Including running all the tests, the builds only take 40 minutes on Hudson.

> 
> --
> Vladimir Prus
> CodeSourcery / Mentor Graphics
> +7 (812) 677-68-40
> 
> > > -----Original Message-----
> > > From: Vladimir Prus [mailto:vladimir@xxxxxxxxxxxxxxxx]
> > > Sent: Wednesday, September 28, 2011 4:32 AM
> > > To: cdt-dev@xxxxxxxxxxx
> > > Cc: Schaefer, Doug
> > > Subject: Re: [cdt-dev] Building with Maven
> > >
> > > On Wednesday, September 21, 2011 19:41:24 Schaefer, Doug wrote:
> > > > > In fact, I have Maven 2.2, which is most recent in Ubuntu. 
> > > > > I'll try the hard way, and install 3.x. Thanks!
> > > >
> > > > I just untar the tarball from Apache and call bin/mvn from there.
> > > > Wasn't hard at all.
> > >
> > > Thanks, this has worked. Now, for a different issue -- it appears 
> > > the build process downloads a pile of things, mostly related to 
> > > tycho, but maybe something else. How do I go about pre-fetching 
> > > all of that, and making the build process use the pre-fetched 
> > > copies, so that our production build can use snapshot of 
> > > everything as of today (for
> > > example) and now try to fetch anything new every time?
> > >
> > > It seems like I might be able to first do a regular build, then 
> > > copy
> > > ~/.m2 and then use use the -gs option to point maven to a point 
> > > maven
> to
> > > a settings file that will specify that repository copy, as well as 
> > > force offline mode, but I would appreciate if somebody comment on 
> > > such a
> plan
> > > (or maybe existing solutions), before I start trying this for real.
> > >
> > > Thanks,
> > >
> > > --
> > > Vladimir Prus
> > > CodeSourcery / Mentor Graphics
> > > +7 (812) 677-68-40