ci: Cache task deps:core artifacts for the Linux and macOS builds. - #2487
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ci: Cache task deps:core artifacts for the Linux and macOS builds.#2487jackluo923 wants to merge 11 commits into
task deps:core artifacts for the Linux and macOS builds.#2487jackluo923 wants to merge 11 commits into
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Included review availability: Your plan provides up to 4 included reviews per hour; 0 remain after this review. WalkthroughThe pull request adds a shared dependency-cache key action. It integrates dependency cache restoration and saving into Linux binary workflows and the macOS core workflow. Cache keys include platform, architecture, dependency sources, and toolchain data where applicable. ChangesDependency caching
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: ⚪ Minimal · up to This PR adds CI caching for dependency artifacts and reports successful Linux/macOS validation plus clean workflow checks. No actionable merge-blocking risk remains after normal checks and review. Suggested reviewers: Sequence Diagram(s)sequenceDiagram
participant BuildWorkflow
participant DepsCacheKey
participant GitHubCache
participant DependencyBuild
participant Tests
BuildWorkflow->>DepsCacheKey: Generate platform-specific dependency cache key
DepsCacheKey-->>BuildWorkflow: Return cache key
BuildWorkflow->>GitHubCache: Restore dependency cache
GitHubCache-->>BuildWorkflow: Return cache status
BuildWorkflow->>DependencyBuild: Build dependencies when cache is absent
DependencyBuild-->>BuildWorkflow: Report successful completion
BuildWorkflow->>Tests: Run tests after dependency preparation
BuildWorkflow->>GitHubCache: Save dependency cache after a successful cache miss
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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In @.github/workflows/clp-artifact-build.yaml:
- Around line 447-469: Restrict deps_cache_save_condition to non-cancelled
main-branch runs by enabling its github.event_name pull-request exclusion and
github.ref refs/heads/main predicates. Apply this at
.github/workflows/clp-artifact-build.yaml lines 447-469 and
.github/workflows/clp-core-build-macos.yaml lines 132-153; the cleanup/save
sites at .github/workflows/clp-artifact-build.yaml lines 528-539, 654-665, and
726-737 require no direct change because they already use the restricted shared
condition.
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August 20, 2026 19:17
Every binary job rebuilds roughly twenty-five C++ dependencies from source on each run, because `actions/checkout` defaults to `clean: true` and wipes `build/deps` even on persistent self-hosted runners. Restore `build/deps/cpp` and `.task` before `task deps:core` and save them afterwards. `.task` has to travel with the tree: without go-task's fingerprint database, `deps:utils:clean-outdated-cpp-checksum-files` wipes the restored checksums on the first run. The key is derived from sources rather than from the built tree, so it is computable at checkout, and it is built from two parts. The first identifies the toolchain: on Linux that is the dependency image's sources, mirroring the per-OS `*_image` filters, since the compiler lives inside the image and hashing sources keeps the key computable before the image is pulled; on macOS the compiler comes from the runner image and Homebrew instead, neither of which is described by files here, so `deps-cache-key` takes an `env_hash` input and the workflow captures `sw_vers`, `clang --version`, `xcodebuild -version` and `brew list --versions` after `install-all.sh` has run. The second part identifies the dependency definitions: the taskfiles that pin every version, tarball URL and set of CMake arguments. The key is matched exactly, with no `restore-keys` fallback. Falling back to a tree built from different sources is unsafe here, because `cmake:install-remote-tar` declares no `sources`/`generates` and leaves the rebuild decision to the build system. Extracted tarballs carry their upstream release date while cached object files carry the wall-clock time of the run that produced them, so after a version bump the new sources are older than the stale objects: Make rebuilds nothing while `cmake --install` still copies the new headers out, leaving an install tree whose headers and libraries disagree, and for a fix that changes no header the change simply never reaches the binaries. `taskfiles/deps/main.yaml` already documents this hazard for antlr, where `CMAKE_POLICY_DEFAULT_CMP0135=NEW` forces a rebuild when extracted files change; that mitigation covers one dependency. Reinstating the fallback would need re-extracted sources to be stamped newer than any cached object. Because there is no fallback, the taskfile half of the key covers only the taskfiles that can affect `deps:core` rather than all of `taskfiles/**`; a wider set would force a full rebuild of every dependency whenever an unrelated taskfile changed. An unrelated edit can still trip `clean-outdated-cpp-checksum-files`, but that only re-runs `tar | md5sum` over the install trees. The save is skipped when the restore was an exact hit, since `saveCache` builds the archive before reserving the key and would otherwise compress the whole tree in every job only to have the reservation rejected as a duplicate. It is also reachable after a failing unit test, so dependencies that built correctly are still cached: the Linux jobs record a `build/.deps-core-ok` marker in the `&&` chain immediately after `deps:core`, keeping `deps:core` and the core build in one `run_command` so the dependency image is downloaded once, while the macOS job keys off `steps.deps_core.outcome` directly because `deps:core` is already its own step there. `use_shared_libs` is passed to the core build and never to `deps:core`, so both matrix legs produce an identical tree and share a key; only one leg saves, so they cannot race. The save is gated to `main`. Cache entries are branch-scoped, so entries written from a feature branch help only that branch while still counting against the repository-wide 10GB quota, and enough concurrent branches could evict the `main` entries every other ref restores from. Reads are unaffected: every ref can already restore from `main`, which is the common case; the only thing this gives up is a branch that changes dependencies caching its own result. `mongo-c-driver`'s packfile is deleted before the save rather than excluded through the cache `path`, because `actions/cache` resolves `path` with `implicitDescendants: false`, so a bare directory yields only itself, a negation has no matched descendant to subtract, and `tar --files-from` recurses into the directory regardless. `mongocxx` populates that repository via `FetchContent` and never reads it again, and its populate step is stamp-gated, so a restored tree without it reconfigures normally. `opentelemetry-proto`'s much smaller `.git` is deliberately kept, since its populate step runs `git` on every reconfigure and fails without it. Measured across all five variants: entries are 367MB to 380MB, restores take 23s to 40s, and the four Linux static legs spent 47 minutes in `run-on-image` against 111 minutes cold.
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junhaoliao
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| shell: "bash" | ||
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| - id: "deps_cache_key" | ||
| uses: "./.github/actions/deps-cache-key" |
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let's add this to monitored_paths
- ".github/actions/deps-cache-key/**"
Co-authored-by: Junhao Liao <junhao@junhao.ca>
The key identified the build environment by hashing the files the dependency image is built from, which only describes the recipe. `FROM` isn't pinned by digest and the package managers aren't pinned to versions, so the same recipe can produce a different compiler and a tree built by one could be restored into the other. Add a `prepare-image` action that pulls or loads the image and reports Docker's immutable, platform-specific image ID, and key the cache on that instead. Because the image is materialised before the key is computed, the identity is available whether the image came from the registry or from a workflow artifact, so the locally-built path no longer needs a separate scheme. `run-on-image` takes the prepared ID and skips pulling or loading a second time; callers that don't pass one fall back to preparing the image themselves. The ID is the digest of the image config, which carries the architecture, so a multi-arch tag cannot resolve to a shared identity. `prepare-image` also asserts that the image is Linux and matches the expected architecture, so a pull resolving to the wrong platform fails loudly rather than producing a mismatched entry.
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Description
Every binary job rebuilds ~25 C++ dependencies from source on each run. This caches the
task deps:coretree across the four Linux binary jobs and the macOS job.run-on-imageacross the four Linux static legs: 111 min → 47 min (−58%).Each cell links to the
run-on-image(or cache-restore) step of the job it was measured in: thecold run populated the entries, and the warm run is the next run on the same
branch, restoring them.
Both runs are of
ci-cache-deps-coreat an earlier revision, before the save was gated tomain(the gate is what the companion test branch below exists to work around) and before the key moved
to the image ID. The caching mechanism is unchanged, so the figures still characterise it, but they
were not produced by the exact revision proposed here. Figures are from the
static-linked-binslegs, the ones that own the save; the cold run shows as cancelled because alater
dynamicjob was, but all four cited jobs finished.Cache entries are 367–380 MB. The spread between variants reflects contention across a shared runner pool, and the fact that
run-on-imagealso covers the dependency-image pull and the core build, neither of which the cache touches.How it works
build/deps/cppand.taskare restored beforetask deps:coreand saved after. The CMake build directories are part of the tree — without them a restore would recompile everything — and.taskis required ordeps:utils:clean-outdated-cpp-checksum-fileswipes the restored checksums on the first run. A step deletesmongo-c-driver's.gitdirectory before the save;mongocxxclones it to build the source but never reads the history again, and dropping it takes ~200 MB off the entry.Key
deps-core-<arch>-<os>-<environment>-<taskfiles>.<environment>identifies the thing that compiles the dependencies, not the files it was built from. On Linux that's the dependency image's image ID — Docker's immutable, platform-specific content ID. A newprepare-imageaction pulls or loads the image and reports it, so the identity exists before the key is computed whether the image came from the registry or from a workflow artifact.run-on-imagethen takes the prepared ID and doesn't pull it a second time.Hashing the image's sources instead would only describe the recipe:
FROMisn't pinned by digest and the package managers aren't pinned to versions, so the same recipe can yield a different compiler, and a tree built by one could be restored into the other with nothing to detect it. The image ID can't drift that way. It's also the digest of the image config, which carries the architecture, so a multi-arch tag can't resolve to a shared identity;prepare-imageadditionally asserts the image is Linux and matches the expected architecture.macOS has no image, so it hashes
sw_vers/clang/xcodebuild/brew listafterinstall-all.shand passes that as the sameenv_hashinput.There is deliberately no
restore-keysfallback. A prefix fallback would, after a dependency bump, unpack a tree built from the previous versions and build on top of it;task deps:coreadds the new version butcmake --installnever removes what the old one left, so headers and libraries the bump deleted survive in the install prefixes and the core build can still find them. Matching exactly means a dependency change costs a full cold rebuild — as every run does today — so the worst case is a slow run, not a wrong binary.Save conditions
The ref is
mainand the event is not apull_request(entries are branch-scoped but share one 10 GB quota; reads are unaffected, since every ref can restore frommain); the restore was not an exact hit (saveCachearchives before reserving the key);deps:coresucceeded, though the unit tests need not have; and it is theuse_shared_libs: falseleg, since that flag never reachesdeps:coreso both legs share a key.Checklist
breaking change.
Validation performed
Companion test branch.
ci-cache-deps-core-testcarries this change with the twomain-gate clauses removed, so it can write entries. On it, all four Linux jobs saved, and the saved keys carry exactly the image IDprepare-imagereported, e.g.Delete that branch once this lands.
The restore half can only be demonstrated after merge. Any branch carrying this change differs from
mainunder.github/actions/**, which the pre-existing_deps_images_common_pathsfilter treats as an image change — so such a branch always builds the dependency image locally. A locally-built image gets a fresh ID every time, because the image ID is the digest of a config that includes a creation timestamp, so its key is new on every run and the restore necessarily misses. A re-run of the test branch confirmed this: four saves, zero restores.That is the intended behaviour rather than a defect: a rebuilt image cannot be shown to match the one that produced a cached tree, so reusing it would be unsound. It costs the ~6% of pull requests that change the image recipe, which pay a cold build in any case. The ~94% that don't pull the identical published image, whose ID is stable, and will hit normally — that is the case this change targets, and it is exercised the first time
mainruns twice.yamllint --strict(repo config) andactionlintare clean on both workflows and the new actions.Known limitation. Nothing has ever been saved on
main, so "every ref can restore frommain" is documented behaviour rather than something this branch could demonstrate. Expect the first post-mergemainrun to be cold: it populates the entries, and other refs begin hitting from the second run onward.