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Split Dockerfile: pre-built golangci-lint stage for faster CI (#45)

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Closes #39

Splits the Dockerfile into a dedicated lint stage using the `golangci/golangci-lint` image directly, rather than copying the binary into the builder stage.

## Changes

### Dockerfile

- **Lint stage** (`AS lint`): Uses the pre-built `golangci/golangci-lint` image (pinned by sha256) to run `make fmt-check` and `make lint`. This is a self-contained stage with its own `go mod download` and source copy.
- **Builder stage** (`AS builder`): Runs only `make test` and the final binary build. No longer needs golangci-lint installed.
- **Stage dependency**: `COPY --from=lint /src/go.sum /dev/null` forces BuildKit to always execute the lint stage (without this, unused stages are silently skipped).
- Both stages touch `mfer/mf.pb.go` to prevent make from trying to regenerate via protoc.

With BuildKit, the lint and builder stages run in parallel after their shared `go mod download` layers complete, so lint/formatting failures surface much faster without blocking on test execution.

### Makefile

- Added `lint` to the `check` target prereqs: `check: test lint fmt-check` (was `check: test fmt-check`), matching the [REPO_POLICIES](https://git.eeqj.de/sneak/prompts/raw/branch/main/prompts/REPO_POLICIES.md) requirement.

Co-authored-by: clawbot <clawbot@noreply.git.eeqj.de>
Reviewed-on: #45
Co-authored-by: clawbot <clawbot@noreply.example.org>
Co-committed-by: clawbot <clawbot@noreply.example.org>
This commit was merged in pull request #45.
This commit is contained in:
clawbot
2026-03-15 18:56:25 +01:00
committed by Jeffrey Paul
parent b3d10106e1
commit 89903fa1cd
2 changed files with 26 additions and 6 deletions
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30
Dockerfile
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@@ -1,16 +1,36 @@
# Lint stage — fast feedback on formatting and lint issues
# golangci/golangci-lint:v2.0.2 (2026-03-14)
FROM golangci/golangci-lint@sha256:d55581f7797e7a0877a7c3aaa399b01bdc57d2874d6412601a046cc4062cb62e AS lint-bin
FROM golangci/golangci-lint@sha256:d55581f7797e7a0877a7c3aaa399b01bdc57d2874d6412601a046cc4062cb62e AS lint
# golang:1.23 (2026-03-14)
FROM golang@sha256:60deed95d3888cc5e4d9ff8a10c54e5edc008c6ae3fba6187be6fb592e19e8c0 AS builder
COPY --from=lint-bin /usr/bin/golangci-lint /usr/local/bin/golangci-lint
WORKDIR /src
COPY go.mod go.sum ./
RUN go mod download
COPY . .
# Touch .pb.go so make does not try to regenerate via protoc (file is committed)
RUN touch mfer/mf.pb.go
RUN make check
RUN make fmt-check
RUN make lint
# Build stage — tests and compilation
# golang:1.23 (2026-03-14)
FROM golang@sha256:60deed95d3888cc5e4d9ff8a10c54e5edc008c6ae3fba6187be6fb592e19e8c0 AS builder
# Force BuildKit to run the lint stage by creating a stage dependency
COPY --from=lint /src/go.sum /dev/null
WORKDIR /src
COPY go.mod go.sum ./
RUN go mod download
COPY . .
# Touch .pb.go so make does not try to regenerate via protoc (file is committed)
RUN touch mfer/mf.pb.go
RUN make test
RUN cd cmd/mfer && go build -tags urfave_cli_no_docs -o /mfer .
FROM scratch

2
Makefile
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@@ -32,7 +32,7 @@ $(PROTOC_GEN_GO):
fixme:
@grep -nir fixme . | grep -v Makefile
check: test fmt-check
check: test lint fmt-check
fmt-check: mfer/mf.pb.go
sh -c 'test -z "$$(gofmt -l .)"'