From e1bcefd805aa521edcb48b1996880bd49ffcf6e3 Mon Sep 17 00:00:00 2001 From: Todd Gamblin Date: Sun, 21 May 2023 01:47:57 +0200 Subject: Update `CHANGELOG.md` for v0.20.0 --- CHANGELOG.md | 218 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 218 insertions(+) (limited to 'CHANGELOG.md') diff --git a/CHANGELOG.md b/CHANGELOG.md index a37d422008..1b46827b79 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -1,3 +1,221 @@ +# v0.20.0 (2023-05-21) + +`v0.20.0` is a major feature release. + +## Features in this release + +1. **`requires()` directive and enhanced package requirements** + + We've added some more enhancements to requirements in Spack (#36286). + + There is a new `requires()` directive for packages. `requires()` is the opposite of + `conflicts()`. You can use it to impose constraints on this package when certain + conditions are met: + + ```python + requires( + "%apple-clang", + when="platform=darwin", + msg="This package builds only with clang on macOS" + ) + ``` + + More on this in [the docs]( + https://spack.rtfd.io/en/latest/packaging_guide.html#conflicts-and-requirements). + + You can also now add a `when:` clause to `requires:` in your `packages.yaml` + configuration or in an environment: + + ```yaml + packages: + openmpi: + require: + - any_of: ["%gcc"] + when: "@:4.1.4" + message: "Only OpenMPI 4.1.5 and up can build with fancy compilers" + ``` + + More details can be found [here]( + https://spack.readthedocs.io/en/latest/build_settings.html#package-requirements) + +2. **Exact versions** + + Spack did not previously have a way to distinguish a version if it was a prefix of + some other version. For example, `@3.2` would match `3.2`, `3.2.1`, `3.2.2`, etc. You + can now match *exactly* `3.2` with `@=3.2`. This is useful, for example, if you need + to patch *only* the `3.2` version of a package. The new syntax is described in [the docs]( + https://spack.readthedocs.io/en/latest/basic_usage.html#version-specifier). + + Generally, when writing packages, you should prefer to use ranges like `@3.2` over + the specific versions, as this allows the concretizer more leeway when selecting + versions of dependencies. More details and recommendations are in the [packaging guide]( + https://spack.readthedocs.io/en/latest/packaging_guide.html#ranges-versus-specific-versions). + + See #36273 for full details on the version refactor. + +3. **New testing interface** + + Writing package tests is now much simpler with a new [test interface]( + https://spack.readthedocs.io/en/latest/packaging_guide.html#stand-alone-tests). + + Writing a test is now as easy as adding a method that starts with `test_`: + + ```python + class MyPackage(Package): + ... + + def test_always_fails(self): + """use assert to always fail""" + assert False + + def test_example(self): + """run installed example""" + example = which(self.prefix.bin.example) + example() + ``` + + You can use Python's native `assert` statement to implement your checks -- no more + need to fiddle with `run_test` or other test framework methods. Spack will + introspect the class and run `test_*` methods when you run `spack test`, + +4. **More stable concretization** + + * Now, `spack concretize` will *only* concretize the new portions of the environment + and will not change existing parts of an environment unless you specify `--force`. + This has always been true for `unify:false`, but not for `unify:true` and + `unify:when_possible` environments. Now it is true for all of them (#37438, #37681). + + * The concretizer has a new `--reuse-deps` argument that *only* reuses dependencies. + That is, it will always treat the *roots* of your environment as it would with + `--fresh`. This allows you to upgrade just the roots of your environment while + keeping everything else stable (#30990). + +5. **Weekly develop snapshot releases** + + Since last year, we have maintained a buildcache of `develop` at + https://binaries.spack.io/develop, but the cache can grow to contain so many builds + as to be unwieldy. When we get a stable `develop` build, we snapshot the release and + add a corresponding tag the Spack repository. So, you can use a stack from a specific + day. There are now tags in the spack repository like: + + * `develop-2023-05-14` + * `develop-2023-05-18` + + that correspond to build caches like: + + * https://binaries.spack.io/develop-2023-05-14/e4s + * https://binaries.spack.io/develop-2023-05-18/e4s + + We plan to store these snapshot releases weekly. + +6. **Specs in buildcaches can be referenced by hash.** + + * Previously, you could run `spack buildcache list` and see the hashes in + buildcaches, but referring to them by hash would fail. + * You can now run commands like `spack spec` and `spack install` and refer to + buildcache hashes directly, e.g. `spack install /abc123` (#35042) + +7. **New package and buildcache index websites** + + Our public websites for searching packages have been completely revamped and updated. + You can check them out here: + + * *Package Index*: https://packages.spack.io + * *Buildcache Index*: https://cache.spack.io + + Both are searchable and more interactive than before. Currently major releases are + shown; UI for browsing `develop` snapshots is coming soon. + +8. **Default CMake and Meson build types are now Release** + + Spack has historically defaulted to building with optimization and debugging, but + packages like `llvm` can be enormous with debug turned on. Our default build type for + all Spack packages is now `Release` (#36679, #37436). This has a number of benefits: + + * much smaller binaries; + * higher default optimization level; and + * defining `NDEBUG` disables assertions, which may lead to further speedups. + + You can still get the old behavior back through requirements and package preferences. + +## Other new commands and directives + +* `spack checksum` can automatically add new versions to package (#24532) +* new command: `spack pkg grep` to easily search package files (#34388) +* New `maintainers` directive (#35083) +* Add `spack buildcache push` (alias to `buildcache create`) (#34861) +* Allow using `-j` to control the parallelism of concretization (#37608) +* Add `--exclude` option to 'spack external find' (#35013) + +## Other new features of note + +* editing: add higher-precedence `SPACK_EDITOR` environment variable +* Many YAML formatting improvements from updating `ruamel.yaml` to the latest version + supporting Python 3.6. (#31091, #24885, #37008). +* Requirements and preferences should not define (non-git) versions (#37687, #37747) +* Environments now store spack version/commit in `spack.lock` (#32801) +* User can specify the name of the `packages` subdirectory in repositories (#36643) +* Add container images supporting RHEL alternatives (#36713) +* make version(...) kwargs explicit (#36998) + +## Notable refactors + +* buildcache create: reproducible tarballs (#35623) +* Bootstrap most of Spack dependencies using environments (#34029) +* Split `satisfies(..., strict=True/False)` into two functions (#35681) +* spack install: simplify behavior when inside environments (#35206) + +## Binary cache and stack updates + +* Major simplification of CI boilerplate in stacks (#34272, #36045) +* Many improvements to our CI pipeline's reliability + +## Removals, Deprecations, and disablements +* Module file generation is disabled by default; you'll need to enable it to use it (#37258) +* Support for Python 2 was deprecated in `v0.19.0` and has been removed. `v0.20.0` only + supports Python 3.6 and higher. +* Deprecated target names are no longer recognized by Spack. Use generic names instead: + * `graviton` is now `cortex_a72` + * `graviton2` is now `neoverse_n1` + * `graviton3` is now `neoverse_v1` +* `blacklist` and `whitelist` in module configuration were deprecated in `v0.19.0` and are + removed in this release. Use `exclude` and `include` instead. +* The `ignore=` parameter of the `extends()` directive has been removed. It was not used by + any builtin packages and is no longer needed to avoid conflicts in environment views (#35588). +* Support for the old YAML buildcache format has been removed. It was deprecated in `v0.19.0` (#34347). +* `spack find --bootstrap` has been removed. It was deprecated in `v0.19.0`. Use `spack + --bootstrap find` instead (#33964). +* `spack bootstrap trust` and `spack bootstrap untrust` are now removed, having been + deprecated in `v0.19.0`. Use `spack bootstrap enable` and `spack bootstrap disable`. +* The `--mirror-name`, `--mirror-url`, and `--directory` options to buildcache and + mirror commands were deprecated in `v0.19.0` and have now been removed. They have been + replaced by positional arguments (#37457). +* Deprecate `env:` as top level environment key (#37424) +* deprecate buildcache create --rel, buildcache install --allow-root (#37285) +* Support for very old perl-like spec format strings (e.g., `$_$@$%@+$+$=`) has been + removed (#37425). This was deprecated in in `v0.15` (#10556). + +## Notable Bugfixes + +* bugfix: don't fetch package metadata for unknown concrete specs (#36990) +* Improve package source code context display on error (#37655) +* Relax environment manifest filename requirements and lockfile identification criteria (#37413) +* `installer.py`: drop build edges of installed packages by default (#36707) +* Bugfix: package requirements with git commits (#35057, #36347) +* Package requirements: allow single specs in requirement lists (#36258) +* conditional variant values: allow boolean (#33939) +* spack uninstall: follow run/link edges on --dependents (#34058) + +## Spack community stats + +* 7,179 total packages, 499 new since `v0.19.0` + * 329 new Python packages + * 31 new R packages +* 336 people contributed to this release + * 317 committers to packages + * 62 committers to core + + # v0.19.1 (2023-02-07) ### Spack Bugfixes -- cgit v1.2.3-60-g2f50