On Wed, Nov 6, 2019 at 6:33 PM Dima Pasechnik <dimp...@gmail.com> wrote:
>
> sdh_install installs a json file into
> SAGE_LOCAL/var/lib/sage/installed/
> which are then used by unistallaller
>
> e.g. "make meataxe" produces SAGE_LOCAL/var/lib/sage/installed/meataxe-1.0.p0
> {
> "package_name": "meataxe",
> "package_version": "1.0.p0",
> "install_date": "Wed Nov 6 17:24:57 GMT 2019",
> "system_uname": "Linux hilbert 5.1.12-gentoo #1 SMP Fri Jun 21
> 19:27:38 BST 2019 x86_64 Intel(R) Core(TM) i7-6600U CPU @ 2.60GHz
> GenuineIntel GNU/Linux",
> "sage_version": "SageMath version 9.0.beta4, Release Date: 2019-11-02",
> "test_result": "",
> "files": [
> "bin/cfcomp",
> "bin/chop",
> ...
> }
>
> I guess sdh_pip_install does not do this, I don't know.
It does. As I wrote in my previous message all SPKGs should be
installed using a DESTDIR scheme, and pip supports this (it's part of
what sdh_pip_install does--ensuring that the correct DESTDIR scheme is
used).
> Anyhow, it would make perfect sense to split the package into two, as
> you propose.
I'm not sure. It depends on what "package" means in this case. From
the perspective of Sage it shouldn't matter.
> On Wed, Nov 6, 2019 at 3:55 PM Simon King <simon.k...@uni-jena.de> wrote:
> >
> > Hi Eric,
> >
> > On 2019-11-06, E. Madison Bray <erik.m.b...@gmail.com> wrote:
> > >> However, I heard rumours that in order to make a Sage optional package
> > >> uninstallable, one needs some new script analogous to spkg-install.
> > >>
> > >> Can someone give me a pointer on what should be done in that script and
> > >> what tools (sdh_*) are available for it?
> > >
> > > That's not quite accurate. In general you do *not* need any
> > > additional scripts, with some exception.
> > > These packaging guidelines still need better documentation, but
> > > essentially you need to make sure the package is built for what is
> > > referred in GNU standards as a "DESTDIR install" [1]. This means that
> > > the package is built for installation to some particular prefix (e.g.
> > > `./configure --prefix=$SAGE_LOCAL` in autoconf terms), but can then be
> > > *installed* with some additional path (the "DESTDIR") prepended to the
> > > prefix. This is similar to providing an alternate root (e.g. prefix
> > > is appended to DESTDIR instead of just "/").
> >
> > Then what to do with p_group_cohomology? Its spkg-install script
> > installs two sub-packages. Each of them, I think, follows the above
> > scheme. However, Sage has no way of knowing that uninstalling
> > p_group_cohomology means uninstalling two sub-packages.
> >
> > Perhaps one possibility is to split the current p_group_cohomology-3.3
> > into its two sub-packages, and make the first (which is autotoolized)
> > a dependency for the second (which is a bunch of cython and python
> > modules linked against the first sub-package.
> >
> > Say:
> > - p_group_cohomology-3.4 shall only comprise what currently is the
> > p/cython part of p_group_cohomology-3.3, and have modular_resolution
> > as a dependency.
> > - modular_resolution-1.0 shall only comprise what currently is the
> > autotoolized c-library part of p_group_cohomology-3.3
> >
> > Advantage: "make p_group_cohomology" would also install the dependency,
> > hence, both packages get installed. And both packages can also be
> > un-installed, I suppose.
> >
> > Disadvantage: The only purpose of modular_resolution-1.0 would be to
> > serve as a dependency, it is (to my knowledge at least) of no
> > independent use.
> >
> > Best regards,
> > Simon
> >
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