Re: pkg / PKG_ADD / arch-dependent

[Olaf Till]

On Sat, Mar 08, 2014 at 04:44:29AM -0800, Philip Nienhuis wrote:
> Julien Bect wrote
> > Hi everyone,
> > 
> > Is there any reason why the PKG_ADD/PKG_DEL scripts located at the root 
> > of a package source (.tar.gz) should end up being moved to the 
> > arch-dependent subdirectory after installation with "pkg install" ?
> > 
> > Because this is the behaviour that I currently observe while trying to 
> > create my first octave package (Octave 3.8.1 / Ubutu 13.04).
> > 
> > The documentation here :
> > 
> > http://www.gnu.org/software/octave/doc/interpreter/Creating-Packages.html
> > 
> > doesn't say explicitely where PKG_ADD will be, just that it is "run when 
> > the package is added to the users path".
> 
> If there is a arch-dependent subdir (some OF packages don't have one),
> PKG_ADD will end up there. Otherwise PKG_ADD ends up in the scripts subdir
> (AFAIK, I'm not sure).
> 
> Yep, sometimes this behavior is very undesired.
> E.g. in the io package, PKG_ADD (in the arch-dependent subdir) was already
> run when the package hadn't fully been loaded yet, so a number of commands
> needed for proper operation of the io package couldn't be executed. 
> That's why in post_install.m I entered some stanzas that move PKG_ADD to the
> scripts subdir.
> 
> If it solves your problem you can copy those lines to your package's
> post_install.m.
> 
> A better solution would be some flag in e.g. the file DESCRIPTION in the
> package .tar.gz telling pkg.m where PKG_ADD is to be moved to.

AFAIK the arch-debendent path is added (with addpath) after the
scripts path in 'pkg install', so since the rootdir/PKGADD directives
get into the arch-dependent directory, they won't be executed until
both the scripts directory and the arch-dependent directory are in
Octaves path. This seems reasonable to me and shoudn't cause problems
in 'pkg install'. (In 'pkg build', however, it's different, and there
could be problems with PKGADD directives within m-files even in 'pkg
install'.)

Olaf

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