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environment.py: allow link:run (#29336)

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* environment.py: allow link:run

Some users want minimal views, excluding run-type dependencies, since
those type of dependencies are covered by rpaths and the symlinked
libraries in the view aren't used anyways.

With this change, an environment like this:

```
spack:
  specs: ['py-flake8']
  view:
    default:
      root: view
      link: run
```

includes python packages and python, but no link type deps of python.
This commit is contained in:
Harmen Stoppels
2022-03-09 21:35:26 +01:00
committed by GitHub
parent bedc9fe665
commit dc78f4c58a
6 changed files with 148 additions and 87 deletions
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26
lib/spack/docs/environments.rst
View File

@@ -740,9 +740,10 @@ file snippet we define a view named ``mpis``, rooted at
version, and compiler name to determine the path for a given
package. This view selects all packages that depend on MPI, and
excludes those built with the PGI compiler at version 18.5.
All the dependencies of each root spec in the environment will be linked
in the view due to the command ``link: all`` and the files in the view will
be symlinks to the spack install directories.
The root specs with their (transitive) link and run type dependencies
will be put in the view due to the ``link: all`` option,
and the files in the view will be symlinks to the spack install
directories.
.. code-block:: yaml
@@ -762,9 +763,22 @@ For more information on using view projections, see the section on
:ref:`adding_projections_to_views`. The default for the ``select`` and
``exclude`` values is to select everything and exclude nothing. The
default projection is the default view projection (``{}``). The ``link``
defaults to ``all`` but can also be ``roots`` when only the root specs
in the environment are desired in the view. The ``link_type`` defaults
to ``symlink`` but can also take the value of ``hardlink`` or ``copy``.
attribute allows the following values:
#. ``link: all`` include root specs with their transitive run and link type
dependencies (default);
#. ``link: run`` include root specs with their transitive run type dependencies;
#. ``link: roots`` include root specs without their dependencies.
The ``link_type`` defaults to ``symlink`` but can also take the value
of ``hardlink`` or ``copy``.
.. tip::
The option ``link: run`` can be used to create small environment views for
Python packages. Python will be able to import packages *inside* of the view even
when the environment is not activated, and linked libraries will be located
*outside* of the view thanks to rpaths.
Any number of views may be defined under the ``view`` heading in a
Spack Environment.