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Add ARM64 build targets for the BOSH agent to enable Cloud Foundry on AWS Graviton and other ARM64 processors. The agent is pure Go with no cgo, so it cross-compiles cleanly for linux/arm64 with zero source changes; these changes are limited to build scripts and CI. - Add bin/build-linux-arm64 (mirrors bin/build-linux-amd64, GOARCH=arm64) - Add ci/tasks/build-linux-arm64.yml Concourse build task - Wire the arm64 build into the promote job and publish compiled-linux-arm64 artifacts alongside amd64 - Add a cross-compile-linux-arm64 GitHub Actions job that guards against regressions on every push/PR (runs on a standard amd64 runner, no ARM64 hardware required) x86_64 build targets are unchanged; ARM64 is strictly additive. Part of RFC #1530 (ARM64 architecture support for Cloud Foundry). Validated locally: GOOS=linux GOARCH=arm64 CGO_ENABLED=0 go build ./... produces a valid ARM64 ELF and go vet passes.
Make the bosh-agent CI image build for arm64 (Graviton) and add an arm64 unit-test job to the pipeline, per RFC cloudfoundry/community#1530. Dockerfile: - Use BuildKit's TARGETARCH to select the bosh-cli linux binary. - Download jq from the maintained jqlang/jq repo, which ships per-arch linux binaries (the archived stedolan/jq has no arm64 asset). - Build the credhub CLI from source at the pinned version, since it publishes a linux-amd64 binary only. - Move the Go copy ahead of the credhub build so Go is available. Pipeline: - Point the jq resource at jqlang/jq. - Add test-unit-arm64, mirroring test-unit but pinned to an arm64 worker. It stays dormant until an arm64-tagged worker is registered (RFC D3 / Open Question 2); amd64 jobs are unchanged. The amd64 build path is byte-for-byte equivalent. sim: cloudfoundry/community#1530
test-unit-arm64 was pinned to an arm64 worker but used the amd64-only ghcr.io/cloudfoundry/bosh-agent image. - Add build-docker-image-arm64, mirroring build-docker-image on an arm64 worker and pushing to a separate "latest-arm64" tag so the amd64 "latest" image is never overwritten. build-docker-args runs in a stock multi-arch ubuntu image, since the arm64 agent image does not exist before its first build. - Add the bosh-agent-docker-image-arm64, bosh-agent-registry-image-arm64 and ubuntu-image resources and use the arm64 image in test-unit-arm64. - Use "#" comments in pipeline.yml; the "#!" form is ytt syntax and this file is plain YAML. The agent Dockerfile still copies Go from ghcr.io/cloudfoundry/bosh/ golang-release, which is published for amd64 only, so the arm64 image build also depends on an arm64 golang-release image. sim: cloudfoundry/community#1530
The agent CI image copies Go from ghcr.io/cloudfoundry/bosh/golang-release, which is amd64-only, so build-docker-image-arm64 could not produce a working arm64 image. - Dockerfile: take the golang-release image from a GOLANG_RELEASE_IMAGE build arg. The default is the image used today, so amd64 builds are unchanged. - build-docker-image-arm64: pass ghcr.io/cloudfoundry/bosh/golang-release:latest-arm64 (published by bosh-package-golang-release's build-docker-image-arm64) and trigger on that tag via a new golang-release-image-arm64 resource. sim: cloudfoundry/community#1530
The earlier arch-aware Dockerfile pointed both arches at jqlang/jq and
built credhub-cli from source, which changed how the amd64 image was
built even though the result was equivalent. Isolate all deviation to
arm64 so the amd64 image build is identical to upstream:
- Dockerfile: select jq and credhub per architecture with an explicit
`case "${TARGETARCH}"`. amd64 runs the original commands verbatim
(stedolan/jq jq-linux64; the linux-amd64 credhub release tarball).
arm64 uses jqlang/jq (jq-linux-arm64) and builds credhub from source,
since neither publishes an arm64 release. Any other arch fails loudly
rather than silently installing the wrong binary. TARGETARCH defaults
to amd64 so a non-BuildKit build reproduces today's image.
- pipeline.yml: revert the jq-github-release resource to owner stedolan
(amd64 unchanged) and add a separate jq-github-release-arm64 (jqlang)
consumed only by the arm64 image job via a get alias.
The amd64 build-docker-image and test-unit jobs and the jq-github-release
resource are now identical to main; only arm64 jobs/resources are added.
sim: cloudfoundry/community#1530
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WalkthroughThe changes add Linux ARM64 compilation, Docker image builds, and unit tests. The CI pipeline uses architecture-specific tools and images, publishes the ARM64 Docker image separately, and includes compiled ARM64 Linux artifacts in promotion. Suggested reviewers: Priority: ⬇️ Low Merge Risk: 🔵 Low · up to
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| Check name | Status | Explanation |
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| Title check |  |
The title clearly and concisely describes the main change: adding ARM64 Linux build support. |
| Description check | |
The description covers the change, context, tests, release notes, breaking-change status, team tag, and AI review requirements. It also clearly documents ARM64 limitations and the effect on existing A… |
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No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0… |
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The description covers the change, context, tests, release notes, breaking-change status, team tag, and AI review requirements. It also clearly documents ARM64 limitations and the effect on existing AMD64 and Windows artifacts.
Full details: Docstring Coverage
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No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (5 skipped: 5 unsupported.)
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Review comments at @ci/docker/Dockerfile:
- Line 63: Update the ARM64 CredHub CLI build in the go build command to pass
CREDHUB_CLI_VERSION through the upstream version.Version linker flag, preserving
the expected release version in the resulting binary.
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The arm64 image builds the CredHub CLI from source (no arm64 release binary exists). The upstream Makefile sets the version via `-ldflags "-X code.cloudfoundry.org/credhub-cli/version.Version=..."`, which the plain `go build` omitted, so `credhub --version` reported an empty version on arm64. Pass CREDHUB_CLI_VERSION through the same linker flag to match the released amd64 binary. amd64 (download) path unchanged. Addresses a CodeRabbit review finding on PR cloudfoundry#493. sim: cloudfoundry/community#1530
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What is this change about?
This adds ARM64 (
linux/arm64) build support for the BOSH agent so it can runon AWS Graviton and other ARM64 processors. It also publishes an ARM64 agent
binary, which the ARM64 stemcell build
(bosh-linux-stemcell-builder PR)
consumes to install the agent into an ARM64 stemcell.
The BOSH agent is pure Go with no cgo, so it cross-compiles cleanly for
linux/arm64with zero source-code changes. The change is limited to buildscripts, the CI Docker image, and the pipeline.
Build + release (affects the published artifacts):
bin/build-linux-arm64— mirrorsbin/build-linux-amd64withGOARCH=arm64.ci/tasks/build-linux-arm64.yml— Concourse build task forlinux/arm64.ci/pipeline.ymlpromotejob — runs the arm64 build in the existingparallel build block and publishes
compiled-linux-arm64/*alongside theexisting amd64 and windows artifacts. The amd64 and windows build tasks and
their published globs are unchanged; the arm64 build is a pure cross-compile
(GOOS/GOARCH env) on the same amd64 worker, so it needs no ARM64 hardware.
Note: this means once merged, every release also attaches a
linux-arm64agent binary — that is the intended mechanism for publishing the ARM64 agent.
Regression guard:
.github/workflows/go.yml— across-compile-linux-arm64job that runsGOOS=linux GOARCH=arm64 CGO_ENABLED=0 go build ./...on every push/PR. Itruns on a standard amd64 runner, so it needs no ARM64 hardware.
CI image (amd64 image build is byte-for-byte unchanged):
ci/docker/Dockerfileis made arch-aware via BuildKit'sTARGETARCH(defaulting to
amd64), with all deviation isolated to the arm64 path:(
stedolan/jqjq-linux64; thecredhub-linux-amd64release tarball).jqlang/jq(jq-linux-arm64;stedolan/jqis archived at 1.6 with no arm64 asset) and credhub is builtfrom source at the pinned tag (credhub-cli publishes
linux-amd64releasesonly). The image already has the Go toolchain, so the source build is cheap.
GOLANG_RELEASE_IMAGEbuild arg defaults to the current amd64golang-releaseimage (amd64 unchanged); the arm64 job overrides it withthe
latest-arm64tag.linux-${TARGETARCH}, which resolves to theidentical
linux-amd64URL on amd64.ci/pipeline.yml:jq-github-releaseresource is unchanged (owner: stedolan); aseparate
jq-github-release-arm64(owner: jqlang) feeds only the arm64image job via a
getalias.build-docker-image-arm64job and atest-unit-arm64job(both
tags: [arm64]), plus their-arm64registry andgolang-release-image-arm64resources. These stay dormant until anarm64-tagged worker is registered (RFC D3) and the arm64golang-releaseimage is published.
build-docker-imageandtest-unitjobs and thejq-github-releaseresource are identical tomain(verified byrendering both and diffing).
The only modification to an existing live job is
promote, which gains thearm64 build task and the
compiled-linux-arm64/*publish glob (see above). Allother amd64 jobs, resources, and published amd64/windows artifacts are
unchanged; everything else is additive.
Please provide contextual information.
RFC: ARM64 (aarch64) Architecture Support for Cloud Foundry community#1530
bosh-agentcross-compiles and executeson ARM64 with no source changes.
DNS → Director → …). The ARM64 stemcell PR depends on the
linux-arm64agentthis PR publishes.
test-unit-arm64are dormant: native ARM64 unit/integration runs require an ARM64 CI worker and the arm64
golang-releaseimage, both tracked as RFC prerequisites (D3). This PR's regression coverage
is the cross-compile guard, which runs on the standard amd64 runner.
What tests have you run against this PR?
Validated locally (Go 1.26):
GOOS=linux GOARCH=arm64 CGO_ENABLED=0 go build ./...— full modulecross-compiles (exit 0). This is exactly what the new
cross-compile-linux-arm64CI job runs.
GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build ./...— amd64 still builds(exit 0); no regression.
./bin/build-linux-arm64— produces an ARM64 ELF.ci/pipeline.ymlpassesfly validate-pipeline. Rendering bothmainandthis branch and diffing confirms the amd64
build-docker-imageandtest-unitjobs and thejq-github-releaseresource are identical; thepipeline differs only by added arm64 jobs/resources and the
promotejob'sadded arm64 build task/glob. No existing amd64 job or artifact is removed or
altered.
bash -n; all added/changed YAML parses.jqlang/jqrelease that thejq-linux-arm64assetexists for the current tag (the arm64 image path).
How should this change be described in bosh-agent release notes?
The BOSH agent is now built and published for
linux/arm64in addition tolinux/amd64, enabling BOSH on ARM64 (e.g. AWS Graviton) hosts.Does this PR introduce a breaking change?
No. ARM64 is additive. Existing x86_64 and Windows build targets and their
published artifacts are unchanged, and the amd64 CI image installs the same
tools at the same pinned versions (jq is sourced from the maintained
jqlang/jqrepo; credhub is built from source at the same pinned tag). No operator action
is required.
Tag your pair, your PM, and/or team!
cc - @beyhan
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