[linting] Add golangci-lint and GHA that runs it (#36)

## Summary

* Moves tests over to own workflow. Release jobs depend on it.
* Adds golangci linter and runs it in test workflows.
* Adds new pull request template.

## How was it tested?

GHA

.github/pull_request_template.md

@@ -0,0 +1,3 @@
+## Summary
+
+## How was it tested?

.github/workflows/release.yml

@@ -1,5 +1,7 @@
 name: release
 
+concurrency: deployment
+
 on:
   # Build/Release on demand
   workflow_dispatch:
@@ -20,23 +22,12 @@ permissions:
   contents: write
 
 jobs:
-  test:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout source code
-        uses: actions/checkout@v3
-      - name: Set up go
-        uses: actions/setup-go@v3
-        with:
-          go-version-file: ./go.mod
-          cache: true
-      - name: Build the module
-        run: go build -v ./...
-      - name: Run all tests
-        run: go test -v ./...
+  tests:
+    uses: ./.github/workflows/tests.yaml
+
   release-snapshot:
     runs-on: ubuntu-latest
-    needs: test
+    needs: tests
     if: ${{ inputs.is_snapshot_release || github.event.schedule }}
     steps:
       - name: Checkout source code
@@ -71,7 +62,7 @@ jobs:
             dist/*.tar.gz
   release:
     runs-on: ubuntu-latest
-    needs: test
+    needs: tests
     # Only release when there's a tag for the release.
     if: startsWith(github.ref, 'refs/tags/')
     steps:

.github/workflows/tests.yaml

@@ -0,0 +1,43 @@
+name: tests
+
+concurrency:
+  group: ${{ github.ref }}
+  cancel-in-progress: true
+
+on:
+  push:
+    branches-ignore:
+      - main
+  workflow_call:
+
+permissions:
+  contents: read
+  pull-requests: read
+
+jobs:
+  golangci-lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up go
+        uses: actions/setup-go@v3
+        with:
+          go-version-file: ./go.mod
+          cache: false # use golangci cache instead
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v3.2.0
+        with:
+          args: --timeout=10m
+
+  golang-tests:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-go@v3
+        with:
+          go-version-file: ./go.mod
+          cache: true
+      - name: Build the module
+        run: go build -v ./...
+      - name: Run all tests
+        run: go test -v ./...

.golangci.yml

@@ -0,0 +1,53 @@
+run:
+  go: "1.19"
+linters:
+  disable-all: true
+  enable:
+    - dupl
+    - errorlint
+    - errcheck
+    - gofmt
+    - goimports
+    - gosimple
+    - govet
+    - importas
+    - ineffassign
+    - misspell
+    - nilerr
+    - reassign
+    - staticcheck
+    - stylecheck
+    - typecheck
+    - unconvert
+    - unparam 
+    - unused
+    - usestdlibvars
+    - varnamelen
+    # - wrapcheck If we're going to use github.com/pkg/errors we should probably turn this on?
+
+    # We'd like to have the following linter enabled, but it's broken for Go
+    # 1.19 as of golangci-lint v1.48.0. Re-enable it when this issue is
+    # fixed: https://github.com/golangci/golangci-lint/issues/2649
+    # - structcheck
+issues:
+  exclude:
+
+linters-settings:
+  varnamelen:
+    max-distance: 10
+    ignore-decls:
+      - T any
+      - c echo.Context
+      - const C
+      - e error
+      - e watch.Event
+      - f *foo.Bar
+      - i int
+      - id string
+      - m map[string]any
+      - m map[string]int
+      - ns string
+      - r *http.Request
+      - t testing.T
+      - w http.ResponseWriter
+      - w io.Writer

README.md

@@ -2,7 +2,7 @@
 
 ### Instant, easy, and predictable shells and containers
 
-[![Join Discord](https://img.shields.io/discord/903306922852245526?color=7389D8&label=discord&logo=discord&logoColor=ffffff)](https://discord.gg/agbskCJXk2) ![License: Apache 2.0](https://img.shields.io/github/license/jetpack-io/devbox) [![version](https://img.shields.io/github/v/release/jetpack-io/devbox?color=green&label=version&sort=semver)](https://github.com/jetpack-io/devbox/releases)
+[![Join Discord](https://img.shields.io/discord/903306922852245526?color=7389D8&label=discord&logo=discord&logoColor=ffffff)](https://discord.gg/agbskCJXk2) ![License: Apache 2.0](https://img.shields.io/github/license/jetpack-io/devbox) [![version](https://img.shields.io/github/v/release/jetpack-io/devbox?color=green&label=version&sort=semver)](https://github.com/jetpack-io/devbox/releases) [![tests](https://github.com/jetpack-io/devbox/actions/workflows/tests.yaml/badge.svg)](https://github.com/jetpack-io/devbox/actions/workflows/tests.yaml)
 
 ---
 

boxcli/root.go

@@ -22,7 +22,7 @@ func RootCmd() *cobra.Command {
 		PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
 			_, err := exec.LookPath("nix-shell")
 			if err != nil {
-				return errors.New("Could not find nix in your PATH\nInstall nix by following the instructions at https://nixos.org/download.html and make sure you've set up your PATH correctly.")
+				return errors.New("could not find nix in your PATH\nInstall nix by following the instructions at https://nixos.org/download.html and make sure you've set up your PATH correctly")
 			}
 			return nil
 		},

cuecfg/cuecfg.go

@@ -21,7 +21,7 @@ func Marshal(v any, extension string) ([]byte, error) {
 
 	switch extension {
 	case ".json":
-		return MarshalJson(v)
+		return MarshalJSON(v)
 	case ".yml", ".yaml":
 		return MarshalYaml(v)
 	}
@@ -31,7 +31,7 @@ func Marshal(v any, extension string) ([]byte, error) {
 func Unmarshal(data []byte, extension string, v any) error {
 	switch extension {
 	case ".json":
-		err := UnmarshalJson(data, v)
+		err := UnmarshalJSON(data, v)
 		if err != nil {
 			return errors.WithStack(err)
 		}

cuecfg/json.go

@@ -8,10 +8,10 @@ import "encoding/json"
 // TODO: consider using cue's JSON marshaller instead of
 // "encoding/json" ... it might have extra functionality related
 // to the cue language.
-func MarshalJson(v interface{}) ([]byte, error) {
+func MarshalJSON(v interface{}) ([]byte, error) {
 	return json.MarshalIndent(v, "", "  ")
 }
 
-func UnmarshalJson(data []byte, v interface{}) error {
+func UnmarshalJSON(data []byte, v interface{}) error {
 	return json.Unmarshal(data, v)
 }

generate.go

@@ -36,7 +36,6 @@ func generate(rootPath string, plan *planner.BuildPlan) error {
 
 func writeFromTemplate(path string, plan *planner.BuildPlan, tmplName string) error {
 	embeddedPath := fmt.Sprintf("tmpl/%s.tmpl", tmplName)
-	t := template.Must(template.New(tmplName+".tmpl").Funcs(templateFuncs).ParseFS(tmplFS, embeddedPath))
 
 	// Should we clear the directory so we start "fresh"?
 	outPath := filepath.Join(path, tmplName)
@@ -54,14 +53,15 @@ func writeFromTemplate(path string, plan *planner.BuildPlan, tmplName string) er
 		return errors.WithStack(err)
 	}
 
+	t := template.Must(template.New(tmplName+".tmpl").Funcs(templateFuncs).ParseFS(tmplFS, embeddedPath))
 	return t.Execute(f, plan)
 }
 
-func toJson(a any) string {
+func toJSON(a any) string {
 	data, _ := json.Marshal(a)
 	return string(data)
 }
 
 var templateFuncs = template.FuncMap{
-	"json": toJson,
+	"json": toJSON,
 }