Caching #2838
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name: Caching | |
# Docs on the workflow: | |
# 1. GitHub cache scoping goes: | |
# [main branch -> PR main branch -> PR. (essentially in a tree fashion)](https://web.archive.org/web/20211125171853/https://docs.github.com/en/actions/advanced-guides/caching-dependencies-to-speed-up-workflows#restrictions-for-accessing-a-cache). | |
# Building & keeping caches on `master` allows | |
# to share the main project state cache be shared to the whole tree. | |
# 2. GitHub has a [default 10G cache pool limit](https://web.archive.org/web/20211125171853/https://docs.github.com/en/actions/advanced-guides/caching-dependencies-to-speed-up-workflows#usage-limits-and-eviction-policy) per repo. | |
# HLS is a big monorepo codebase, which means easy cache pool | |
# invalidation & exhaustion because of the pool limit. | |
# To keep caches useful - the main state of the main branch should remain | |
# & so keep caching in the repo well below the limit. | |
# that means preferring main branch to the PR caches | |
# (especially internal branch ones), since PRs from internal branches - | |
# count into the repo 10G pool, while that cache gets used only inside of the PR, | |
# while exhausting the pool would bork cache for the rest of the community. | |
# That is a short story why `dist-newstyle` (especially full) currently is not | |
# includded into `master` or PR caches. | |
defaults: | |
run: | |
shell: bash | |
# See: https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#concurrency. | |
concurrency: | |
group: ${{ github.head_ref }}-${{ github.workflow }} | |
cancel-in-progress: true | |
on: | |
workflow_dispatch: | |
push: | |
branches: | |
- master | |
schedule: | |
# Refresh snapshot every (02+8*x):25 UTC | |
# When cache is present it is a light check workflow with early termination. | |
# When primary cache is not hit - runs the cache generation. | |
# Why: GitHub repo has 10G pool & on overflow GitHub removes caches in FIFO manner. | |
# When internal branche PRs save into the same pool - | |
# their cache is accessible only inside of the scope of the PR. | |
# If main cache is forced out - there are no cache shared between PRs, | |
# which implies all PRs would start to create & save their cache. | |
# Reinstitution of the main chache puts it back into FIFO | |
# & so it gets shared across all PRs. | |
- cron: "25 2/8 * * *" | |
# Not using a explicit target to build the top level haskell-language-server package | |
# which make build the rest of subpackages *libs* (but shake-bench) | |
env: | |
cabalBuild: "v2-build --keep-going" | |
jobs: | |
pre_job: | |
runs-on: ubuntu-latest | |
outputs: | |
should_skip: ${{ steps.skip_check.outputs.should_skip }} | |
steps: | |
- id: skip_check | |
uses: fkirc/[email protected] | |
with: | |
cancel_others: false | |
paths_ignore: '["**/docs/**" | |
, "**.md" | |
, "**/LICENSE" | |
, "**.nix" | |
, "flake.lock" | |
, "**/README.md" | |
, "FUNDING.yml" | |
, ".circleci/**" | |
, "**/stack*.yaml" | |
, ".gitlab-ci.yaml" | |
, ".gitlab/**" | |
]' | |
caching: | |
if: needs.pre_job.outputs.should_skip != 'true' | |
needs: pre_job | |
runs-on: ${{ matrix.os }} | |
strategy: | |
fail-fast: false | |
matrix: | |
# This list of GHC (including the "exclude" list) versions must match | |
# to the list of GHC versions specified in 'test.yml' | |
ghc: [ "9.4.4" | |
, "9.2.5" | |
, "9.0.2" | |
, "8.10.7" | |
] | |
os: [ "ubuntu-latest" | |
, "macOS-latest" | |
, "windows-latest" | |
] | |
steps: | |
- uses: actions/checkout@v3 | |
- uses: ./.github/actions/setup-build | |
with: | |
ghc: ${{ matrix.ghc }} | |
os: ${{ runner.os }} | |
# Download sources for feeding build sources cache | |
# Fetching from github cache is faster than doing it from hackage | |
# Sources does not change per ghc and ghc version son only doing it | |
# for one matrix job (it is arbitrary) | |
- if: steps.compiled-deps.outputs.cache-hit != 'true' && runner.os == 'Linux' && matrix.ghc == '8.10.7' | |
name: Download sources | |
run: | | |
cabal $cabalBuild --only-download --enable-benchmarks --enable-tests | |
# This build agenda is not to have successful code but produce cache as much as possible | |
- if: steps.compiled-deps.outputs.cache-hit != 'true' | |
name: Build haskell-language-server | |
run: | | |
# repeating builds to workaround segfaults in windows and ghc-8.8.4 | |
cabal $cabalBuild || cabal $cabalBuild || cabal $cabalBuild | |
# We build ghcide with benchs and test enabled to include its dependencies in the cache | |
# (including shake-bench) | |
# Only for the same ghc and os used in the bench workflow, so we save cache space | |
- if: steps.compiled-deps.outputs.cache-hit != 'true' && runner.os == 'Linux' && matrix.ghc == '8.10.7' | |
name: Build ghcide benchmark | |
run: | | |
cabal $cabalBuild ghcide --enable-benchmarks --enable-tests |