Update CHANGELOG.md for v0.20.0
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Todd Gamblin
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CHANGELOG.md
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CHANGELOG.md
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# v0.20.0 (2023-05-21)
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`v0.20.0` is a major feature release.
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## Features in this release
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1. **`requires()` directive and enhanced package requirements**
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We've added some more enhancements to requirements in Spack (#36286).
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There is a new `requires()` directive for packages. `requires()` is the opposite of
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`conflicts()`. You can use it to impose constraints on this package when certain
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conditions are met:
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```python
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requires(
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"%apple-clang",
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when="platform=darwin",
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msg="This package builds only with clang on macOS"
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)
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```
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More on this in [the docs](
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https://spack.rtfd.io/en/latest/packaging_guide.html#conflicts-and-requirements).
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You can also now add a `when:` clause to `requires:` in your `packages.yaml`
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configuration or in an environment:
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```yaml
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packages:
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openmpi:
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require:
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- any_of: ["%gcc"]
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when: "@:4.1.4"
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message: "Only OpenMPI 4.1.5 and up can build with fancy compilers"
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```
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More details can be found [here](
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https://spack.readthedocs.io/en/latest/build_settings.html#package-requirements)
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2. **Exact versions**
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Spack did not previously have a way to distinguish a version if it was a prefix of
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some other version. For example, `@3.2` would match `3.2`, `3.2.1`, `3.2.2`, etc. You
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can now match *exactly* `3.2` with `@=3.2`. This is useful, for example, if you need
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to patch *only* the `3.2` version of a package. The new syntax is described in [the docs](
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https://spack.readthedocs.io/en/latest/basic_usage.html#version-specifier).
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Generally, when writing packages, you should prefer to use ranges like `@3.2` over
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the specific versions, as this allows the concretizer more leeway when selecting
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versions of dependencies. More details and recommendations are in the [packaging guide](
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https://spack.readthedocs.io/en/latest/packaging_guide.html#ranges-versus-specific-versions).
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See #36273 for full details on the version refactor.
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3. **New testing interface**
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Writing package tests is now much simpler with a new [test interface](
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https://spack.readthedocs.io/en/latest/packaging_guide.html#stand-alone-tests).
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Writing a test is now as easy as adding a method that starts with `test_`:
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```python
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class MyPackage(Package):
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...
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def test_always_fails(self):
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"""use assert to always fail"""
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assert False
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def test_example(self):
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"""run installed example"""
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example = which(self.prefix.bin.example)
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example()
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```
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You can use Python's native `assert` statement to implement your checks -- no more
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need to fiddle with `run_test` or other test framework methods. Spack will
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introspect the class and run `test_*` methods when you run `spack test`,
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4. **More stable concretization**
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* Now, `spack concretize` will *only* concretize the new portions of the environment
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and will not change existing parts of an environment unless you specify `--force`.
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This has always been true for `unify:false`, but not for `unify:true` and
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`unify:when_possible` environments. Now it is true for all of them (#37438, #37681).
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* The concretizer has a new `--reuse-deps` argument that *only* reuses dependencies.
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That is, it will always treat the *roots* of your environment as it would with
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`--fresh`. This allows you to upgrade just the roots of your environment while
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keeping everything else stable (#30990).
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5. **Weekly develop snapshot releases**
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Since last year, we have maintained a buildcache of `develop` at
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https://binaries.spack.io/develop, but the cache can grow to contain so many builds
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as to be unwieldy. When we get a stable `develop` build, we snapshot the release and
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add a corresponding tag the Spack repository. So, you can use a stack from a specific
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day. There are now tags in the spack repository like:
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* `develop-2023-05-14`
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* `develop-2023-05-18`
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that correspond to build caches like:
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* https://binaries.spack.io/develop-2023-05-14/e4s
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* https://binaries.spack.io/develop-2023-05-18/e4s
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We plan to store these snapshot releases weekly.
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6. **Specs in buildcaches can be referenced by hash.**
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* Previously, you could run `spack buildcache list` and see the hashes in
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buildcaches, but referring to them by hash would fail.
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* You can now run commands like `spack spec` and `spack install` and refer to
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buildcache hashes directly, e.g. `spack install /abc123` (#35042)
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7. **New package and buildcache index websites**
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Our public websites for searching packages have been completely revamped and updated.
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You can check them out here:
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* *Package Index*: https://packages.spack.io
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* *Buildcache Index*: https://cache.spack.io
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Both are searchable and more interactive than before. Currently major releases are
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shown; UI for browsing `develop` snapshots is coming soon.
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8. **Default CMake and Meson build types are now Release**
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Spack has historically defaulted to building with optimization and debugging, but
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packages like `llvm` can be enormous with debug turned on. Our default build type for
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all Spack packages is now `Release` (#36679, #37436). This has a number of benefits:
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* much smaller binaries;
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* higher default optimization level; and
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* defining `NDEBUG` disables assertions, which may lead to further speedups.
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You can still get the old behavior back through requirements and package preferences.
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## Other new commands and directives
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* `spack checksum` can automatically add new versions to package (#24532)
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* new command: `spack pkg grep` to easily search package files (#34388)
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* New `maintainers` directive (#35083)
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* Add `spack buildcache push` (alias to `buildcache create`) (#34861)
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* Allow using `-j` to control the parallelism of concretization (#37608)
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* Add `--exclude` option to 'spack external find' (#35013)
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## Other new features of note
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* editing: add higher-precedence `SPACK_EDITOR` environment variable
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* Many YAML formatting improvements from updating `ruamel.yaml` to the latest version
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supporting Python 3.6. (#31091, #24885, #37008).
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* Requirements and preferences should not define (non-git) versions (#37687, #37747)
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* Environments now store spack version/commit in `spack.lock` (#32801)
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* User can specify the name of the `packages` subdirectory in repositories (#36643)
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* Add container images supporting RHEL alternatives (#36713)
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* make version(...) kwargs explicit (#36998)
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## Notable refactors
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* buildcache create: reproducible tarballs (#35623)
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* Bootstrap most of Spack dependencies using environments (#34029)
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* Split `satisfies(..., strict=True/False)` into two functions (#35681)
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* spack install: simplify behavior when inside environments (#35206)
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## Binary cache and stack updates
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* Major simplification of CI boilerplate in stacks (#34272, #36045)
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* Many improvements to our CI pipeline's reliability
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## Removals, Deprecations, and disablements
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* Module file generation is disabled by default; you'll need to enable it to use it (#37258)
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* Support for Python 2 was deprecated in `v0.19.0` and has been removed. `v0.20.0` only
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supports Python 3.6 and higher.
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* Deprecated target names are no longer recognized by Spack. Use generic names instead:
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* `graviton` is now `cortex_a72`
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* `graviton2` is now `neoverse_n1`
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* `graviton3` is now `neoverse_v1`
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* `blacklist` and `whitelist` in module configuration were deprecated in `v0.19.0` and are
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removed in this release. Use `exclude` and `include` instead.
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* The `ignore=` parameter of the `extends()` directive has been removed. It was not used by
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any builtin packages and is no longer needed to avoid conflicts in environment views (#35588).
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* Support for the old YAML buildcache format has been removed. It was deprecated in `v0.19.0` (#34347).
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* `spack find --bootstrap` has been removed. It was deprecated in `v0.19.0`. Use `spack
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--bootstrap find` instead (#33964).
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* `spack bootstrap trust` and `spack bootstrap untrust` are now removed, having been
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deprecated in `v0.19.0`. Use `spack bootstrap enable` and `spack bootstrap disable`.
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* The `--mirror-name`, `--mirror-url`, and `--directory` options to buildcache and
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mirror commands were deprecated in `v0.19.0` and have now been removed. They have been
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replaced by positional arguments (#37457).
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* Deprecate `env:` as top level environment key (#37424)
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* deprecate buildcache create --rel, buildcache install --allow-root (#37285)
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* Support for very old perl-like spec format strings (e.g., `$_$@$%@+$+$=`) has been
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removed (#37425). This was deprecated in in `v0.15` (#10556).
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## Notable Bugfixes
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* bugfix: don't fetch package metadata for unknown concrete specs (#36990)
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* Improve package source code context display on error (#37655)
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* Relax environment manifest filename requirements and lockfile identification criteria (#37413)
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* `installer.py`: drop build edges of installed packages by default (#36707)
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* Bugfix: package requirements with git commits (#35057, #36347)
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* Package requirements: allow single specs in requirement lists (#36258)
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* conditional variant values: allow boolean (#33939)
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* spack uninstall: follow run/link edges on --dependents (#34058)
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## Spack community stats
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* 7,179 total packages, 499 new since `v0.19.0`
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* 329 new Python packages
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* 31 new R packages
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* 336 people contributed to this release
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* 317 committers to packages
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* 62 committers to core
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# v0.19.1 (2023-02-07)
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### Spack Bugfixes
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