ci: migrate to grafana/k6-ci

.github/workflows/all.yml

@@ -0,0 +1,18 @@
+name: CI
+on:
+  # Enable manually triggering this workflow via the API or web UI
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+      - master
+    tags:
+      - v*
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  checks:
+    uses: grafana/k6-ci/.github/workflows/all.yml@143ec80c1678ae96a54b82389ea862d4748c27e1 # v0.3.0

.gitignore

@@ -4,3 +4,6 @@ xk6
 xk6.exe
 /build
 coverage.txt
+# Generated by `make lint` (k6-ci golangci config)
+.golangci-base.yml
+.golangci.yml

Makefile

@@ -3,6 +3,15 @@
 SHELL=bash
 .SHELLFLAGS=-e -o pipefail -c
 
+# k6-ci golangci-lint config. `make lint` downloads .golangci.yml from
+# grafana/k6-ci at the ref pinned in $(WORKFLOW) and applies the optional
+# $(LINT_PATCH). See grafana/k6-ci/README.md.
+WORKFLOW   ?= .github/workflows/all.yml
+K6_CI_REF  := $(shell grep -oE 'grafana/k6-ci/[^@[:space:]]+@[A-Za-z0-9._/-]+' $(WORKFLOW) | head -n1 | cut -d@ -f2)
+LINT_BASE  ?= .golangci-base.yml
+LINT_FINAL ?= .golangci.yml
+LINT_PATCH ?= .golangci.patch
+
 .PHONY: __help__
 __help__:
 	@echo 'Usage: make [target]'
@@ -47,10 +56,28 @@ format:
 .PHONY: lint
 lint: 
 	@(\
-		golangci-lint run ./...;\
+		curl -fsSL https://raw.githubusercontent.com/grafana/k6-ci/$(K6_CI_REF)/.golangci.yml -o $(LINT_BASE);\
+		cp $(LINT_BASE) $(LINT_FINAL);\
+		if [ -f $(LINT_PATCH) ]; then echo "Applying $(LINT_PATCH)"; git apply $(LINT_PATCH); fi;\
+		go run github.com/golangci/golangci-lint/v2/cmd/golangci-lint@$$(head -n1 $(LINT_BASE) | tr -d '# ') run --config=$(LINT_FINAL) ./...;\
 		xk6 lint;\
 	)
 
+# Regenerate $(LINT_PATCH) from the locally edited $(LINT_FINAL)
+.PHONY: update-lint-patch
+update-lint-patch: 
+	@(\
+		if [ ! -f $(LINT_FINAL) ]; then echo "Run 'make lint' first to materialize $(LINT_FINAL), edit it, then re-run."; exit 1; fi;\
+		diff -u --label a/.golangci.yml --label b/.golangci.yml $(LINT_BASE) $(LINT_FINAL) > $(LINT_PATCH) || true;\
+	)
+
+# Remove the downloaded/assembled lint config
+.PHONY: clean-lint
+clean-lint: 
+	@(\
+		rm -f $(LINT_BASE) $(LINT_FINAL);\
+	)
+
 # Generate the Makefile
 .PHONY: makefile
 makefile: 

cmd_greet.go

@@ -1,6 +1,8 @@
 package example
 
 import (
+	"fmt"
+
 	"github.com/spf13/cobra"
 	"go.k6.io/k6/v2/cmd/state"
 )
@@ -22,9 +24,9 @@ Customize the greeting by specifying a name with the --name flag.
 
 	name := cmd.Flags().StringP("name", "n", "User", "Name of the person to greet")
 
-	cmd.RunE = func(cmd *cobra.Command, args []string) error {
-		println("Hello, " + *name + "! Happy subcommanding with k6!")
-		return nil
+	cmd.RunE = func(cmd *cobra.Command, _ []string) error {
+		_, err := fmt.Fprintln(cmd.OutOrStdout(), "Hello, "+*name+"! Happy subcommanding with k6!")
+		return err
 	}
 
 	return cmd