[Scons-dev] User-specified signature function (was: Re: Feature request / patch)

[Eric W. Anderson]

Hi again,

Is anyone interested in this?  At the very least, can someone tell me if this
is obviously stupid and/or going to get broken by some planned refactoring?

Thanks,
Eric

Thus spake Eric W. Anderson (andersoe at ece.cmu.edu):


> Hi All,

> 

> In that case, I have a request for advice from core developers:  I've written

> an extension to the signature system that allows the user to specify an extra

> signature-generating function, so that in addition to a .csig, File nodes can

> have a .ext_sig attribute, the semantics of which are up to the user.

> 

> My motivating application is that I use some tools which update a timestamp in

> a comment in the _input_ files every damned time they run, which messes

> everything up.  Right now, I use sed to eliminate those timestamps, which makes

> SCons happy but confuses the tools when they're run normally.  My solution is

> an extra-signature function which takes and MD5 sum over only the non-comment

> lines in a file, and then a decider function which uses that ext_sig.

> 

> Now, here are my questions:

> 

> 1. Is there a reasonable way I can access the user-defined environment when

> SCons.Node.FS.File.get_ext_sig() is called?  It's called a lot of times when

> get_build_env() returns None, and get_env() returns the default env.

> 

> 2. If my extension is of interest to others, and might someday become part of

> the main sources, how should I make it better / cleaner / prettier / etc.?

> 

> Thanks,

> Eric

> 

> 

> 

> Gary Oberbrunner wrote:

>  

> > On Tue, Jul 31, 2012 at 10:30 AM, Eric Anderson <andersoe at ece.cmu.edu> wrote:

> > > Hi All,

> > >

> > > I recently submitted a feature request (and prototype implementation) on

> > > Tigris (http://scons.tigris.org/issues/show_bug.cgi?id=2860), but I'm

> > > not clear on whether you're still using that service.

> > 

> > You did it all right.  We do (still) use Tigris for our bug tracker.

> > 

> > > Do I need to do anything else / different?  Should I ask about it on

> > > this list, etc?

> > 

> > If you'd like to discuss it, this list is the place to do so.

> > Otherwise the usual path is it'll get prioritized along with other

> > items for a future release.

> > 

> > -- 

> > Gary

> > 

> 

> -- 

> Eric W. Anderson                     Electrical and Computer Engineering

> andersoe at ece.cmu.edu                          Carnegie Mellon University

> phone: +1-412-268-1908                                  Roberts Hall 244

> 

>                           PGP key fingerprint:

>        	   D3C5 D6FF EDED 9F1F C36D  53A3 74B7 53A6 3C74 5F12





> _______________________________________________

> Scons-dev mailing list

> Scons-dev at scons.org

> http://two.pairlist.net/mailman/listinfo/scons-dev



-- 
Eric W. Anderson                     Electrical and Computer Engineering
andersoe at ece.cmu.edu                          Carnegie Mellon University
phone: +1-412-268-1908                                  Roberts Hall 244

                          PGP key fingerprint:
       	   D3C5 D6FF EDED 9F1F C36D  53A3 74B7 53A6 3C74 5F12
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 198 bytes
Desc: Digital signature
Url : <http://two.pairlist.net/pipermail/scons-dev/attachments/20120831/169a1723/attachment.pgp>