d94e8ab36f
#40773 introduced python-venv, which improved build isolation and avoids issues with, e.g., `ubuntu`'s system python modifying `sysconfig` to include a (very unwanted) `local` directory within the default install layout. This addresses a few cases where #40773 removed functionality, without harming the default cases where we use `python-venv`. Traditionally, *every* view with `python` in it was essentially a virtual environment, because we would copy the `python` interpreter and `os.py` into every view when linking. We now rely on `python-venv` to do that, but only when it's used (i.e. new builds) and only for packages that have an `extends("python")` directive. This again makes every view with `python` in it a virtual environment, but only if we're not already using a package like `python-venv`. This uses a different mechanism from before -- instead of using the `virtualenv` trick of copying `python` into the prefix, we instead create a `pyvenv.cfg` like `venv` (the more modern way to do it). This fixes two things: 1. If you already had an environment before Spack `v0.22` that worked, it would stop working without a reconcretize and rebuild in `v0.22`, because we no longer copy the python interpreter on link. Adding `pyvenv.cfg` fixes this in a more modern way, so old views will keep working. 2. If you have an env that only includes python packages that use `depends_on("python")` instead of `extends("python")`, those packages will now be importable as before, though they won't have the same level of build isolation you'd get with `extends` and `python-venv`. * views: avoid making client code deal with link functions Users of views and ViewDescriptors shouldn't have to deal with link functions -- they should just say what type of linking they want. - [x] views take a link_type, not a link function - [x] views work out the link function from the link type - [x] view descriptors and commands now just tell the view what they want. * python: simplify logic for avoiding pyvenv.cfg in copy views Signed-off-by: Todd Gamblin <tgamblin@llnl.gov> |
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| .devcontainer | ||
| .github | ||
| bin | ||
| etc/spack/defaults | ||
| lib/spack | ||
| share/spack | ||
| var/spack | ||
| .codecov.yml | ||
| .dockerignore | ||
| .flake8 | ||
| .git-blame-ignore-revs | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .readthedocs.yml | ||
| CHANGELOG.md | ||
| CITATION.cff | ||
| COPYRIGHT | ||
| LICENSE-APACHE | ||
| LICENSE-MIT | ||
| NOTICE | ||
| pyproject.toml | ||
| pytest.ini | ||
| README.md | ||
| SECURITY.md | ||
Spack is a multi-platform package manager that builds and installs multiple versions and configurations of software. It works on Linux, macOS, and many supercomputers. Spack is non-destructive: installing a new version of a package does not break existing installations, so many configurations of the same package can coexist.
Spack offers a simple "spec" syntax that allows users to specify versions and configuration options. Package files are written in pure Python, and specs allow package authors to write a single script for many different builds of the same package. With Spack, you can build your software all the ways you want to.
See the Feature Overview for examples and highlights.
To install spack and your first package, make sure you have Python. Then:
$ git clone -c feature.manyFiles=true https://github.com/spack/spack.git
$ cd spack/bin
$ ./spack install zlib
Documentation
Full documentation is available, or
run spack help or spack help --all.
For a cheat sheet on Spack syntax, run spack help --spec.
Tutorial
We maintain a hands-on tutorial. It covers basic to advanced usage, packaging, developer features, and large HPC deployments. You can do all of the exercises on your own laptop using a Docker container.
Feel free to use these materials to teach users at your organization about Spack.
Community
Spack is an open source project. Questions, discussion, and contributions are welcome. Contributions can be anything from new packages to bugfixes, documentation, or even new core features.
Resources:
- Slack workspace: spackpm.slack.com. To get an invitation, visit slack.spack.io.
- Matrix space: #spack-space:matrix.org: bridged to Slack.
- Github Discussions: for Q&A and discussions. Note the pinned discussions for announcements.
- X: @spackpm. Be sure to
@mentionus! - Mailing list: groups.google.com/d/forum/spack: only for announcements. Please use other venues for discussions.
Contributing
Contributing to Spack is relatively easy. Just send us a
pull request.
When you send your request, make develop the destination branch on the
Spack repository.
Your PR must pass Spack's unit tests and documentation tests, and must be PEP 8 compliant. We enforce these guidelines with our CI process. To run these tests locally, and for helpful tips on git, see our Contribution Guide.
Spack's develop branch has the latest contributions. Pull requests
should target develop, and users who want the latest package versions,
features, etc. can use develop.
Releases
For multi-user site deployments or other use cases that need very stable software installations, we recommend using Spack's stable releases.
Each Spack release series also has a corresponding branch, e.g.
releases/v0.14 has 0.14.x versions of Spack, and releases/v0.13 has
0.13.x versions. We backport important bug fixes to these branches but
we do not advance the package versions or make other changes that would
change the way Spack concretizes dependencies within a release branch.
So, you can base your Spack deployment on a release branch and git pull
to get fixes, without the package churn that comes with develop.
The latest release is always available with the releases/latest tag.
See the docs on releases for more details.
Code of Conduct
Please note that Spack has a Code of Conduct. By participating in the Spack community, you agree to abide by its rules.
Authors
Many thanks go to Spack's contributors.
Spack was created by Todd Gamblin, tgamblin@llnl.gov.
Citing Spack
If you are referencing Spack in a publication, please cite the following paper:
- Todd Gamblin, Matthew P. LeGendre, Michael R. Collette, Gregory L. Lee, Adam Moody, Bronis R. de Supinski, and W. Scott Futral. The Spack Package Manager: Bringing Order to HPC Software Chaos. In Supercomputing 2015 (SC’15), Austin, Texas, November 15-20 2015. LLNL-CONF-669890.
On GitHub, you can copy this citation in APA or BibTeX format via the "Cite this repository"
button. Or, see the comments in CITATION.cff for the raw BibTeX.
License
Spack is distributed under the terms of both the MIT license and the Apache License (Version 2.0). Users may choose either license, at their option.
All new contributions must be made under both the MIT and Apache-2.0 licenses.
See LICENSE-MIT, LICENSE-APACHE, COPYRIGHT, and NOTICE for details.
SPDX-License-Identifier: (Apache-2.0 OR MIT)
LLNL-CODE-811652