fix lint errors, enable CI

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

.github/workflows/ci.yml

@@ -0,0 +1,34 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Go 1.14.2
+        uses: actions/setup-go@v1
+        with:
+          go-version: 1.14.2
+        id: go
+
+      - name: Insatall Dependencies
+        run: |
+          curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sudo sh -s -- -b /usr/local/bin v1.23.8
+          curl -L https://github.com/cuelang/cue/releases/download/v0.3.0-alpha6/cue_0.3.0-alpha6_Linux_x86_64.tar.gz | sudo tar zxf - -C /usr/local/bin
+
+      - name: Check out
+        uses: actions/checkout@v2
+
+      - name: Build
+        run: |
+          make
+
+      - name: Lint
+        run: |
+          make lint

.golangci.yml

@@ -0,0 +1,34 @@
+linters:
+  disable-all: true
+  timeout: 30m
+  enable:
+    - bodyclose
+    - deadcode
+    - depguard
+    - dogsled
+    - dupl
+    - goconst
+    - gocritic
+    - gocyclo
+    - gofmt
+    - goimports
+    - golint
+    - goprintffuncname
+    - gosec
+    - gosimple
+    - govet
+    - ineffassign
+    - misspell
+    - nakedret
+    - prealloc
+    - rowserrcheck
+    - scopelint
+    - staticcheck
+    - structcheck
+    - stylecheck
+    - typecheck
+    - unconvert
+    - unparam
+    - unused
+    - varcheck
+    - whitespace

Makefile

@@ -1,3 +1,19 @@
+.PHONY: all
+all: dagger
+
+.PHONY: generate
+generate:
+	go generate ./dagger
+
 .PHONY: dagger
-dagger:
-	go generate ./dagger && go build -o ./cmd/dagger/ ./cmd/dagger/
+dagger: generate
+	go build -o ./cmd/dagger/ ./cmd/dagger/
+
+.PHONY: cuefmt
+cuefmt:
+	(cd ./dagger && cue fmt -s ./... && cue trim -s ./...)
+
+.PHONY: lint
+lint:
+	golangci-lint run
+	@test -z "$$(git status -s . | grep -e "^ M"  | grep .cue | cut -d ' ' -f3 | tee /dev/stderr)"

cmd/dagger-frontend/main.go

@@ -1,14 +0,0 @@
-package main
-
-import (
-	"dagger.cloud/go/dagger"
-	"github.com/moby/buildkit/frontend/gateway/grpcclient"
-	"github.com/moby/buildkit/util/appcontext"
-)
-
-func main() {
-	r := &dagger.Runtime{}
-	if err := grpcclient.RunFromEnvironment(appcontext.Context(), r.BKFrontend); err != nil {
-		panic(err)
-	}
-}

dagger/client.go

@@ -17,7 +17,7 @@ import (
 
 	// buildkit
 	bk "github.com/moby/buildkit/client"
-	_ "github.com/moby/buildkit/client/connhelper/dockercontainer"
+	_ "github.com/moby/buildkit/client/connhelper/dockercontainer" // import the container connection driver
 
 	// docker output
 	"github.com/containerd/console"
@@ -188,7 +188,7 @@ func (c *Client) buildfn(ctx context.Context, ch chan *bk.SolveStatus, w io.Writ
 }
 
 // Read tar export stream from buildkit Build(), and extract cue output
-func (c *Client) outputfn(ctx context.Context, r io.Reader, out *Value) func() error {
+func (c *Client) outputfn(_ context.Context, r io.Reader, out *Value) func() error {
 	return func() error {
 		defer debugf("outputfn complete")
 		tr := tar.NewReader(r)
@@ -230,7 +230,7 @@ type Node struct {
 }
 
 func (n Node) ComponentPath() cue.Path {
-	var parts []cue.Selector
+	parts := []cue.Selector{}
 	for _, sel := range n.Path.Selectors() {
 		if strings.HasPrefix(sel.String(), "#") {
 			break
@@ -326,7 +326,6 @@ func (c *Client) printfn(ctx context.Context, ch, ch2 chan *bk.SolveStatus) func
 				// see proto 67
 			}
 		}
-		return nil
 	}
 }
 

dagger/component.go

@@ -14,10 +14,7 @@ func (c *Component) Value() *Value {
 
 func (c *Component) Exists() bool {
 	// Does #dagger exist?
-	if c.Config().Err() != nil {
-		return false
-	}
-	return true
+	return c.Config().Err() == nil
 }
 
 // Return the contents of the "#dagger" annotation.

dagger/component_test.go

@@ -32,7 +32,7 @@ func TestValidateSimpleComponent(t *testing.T) {
 	}
 	n := 0
 	if err := s.Walk(func(op *Op) error {
-		n += 1
+		n++
 		return nil
 	}); err != nil {
 		t.Fatal(err)

dagger/op.go

@@ -138,7 +138,7 @@ func (op *Op) Local(ctx context.Context, fs FS, out Fillable) (FS, error) {
 }
 
 func (op *Op) Exec(ctx context.Context, fs FS, out Fillable) (FS, error) {
-	var opts []llb.RunOption
+	opts := []llb.RunOption{}
 	var cmd struct {
 		Args   []string
 		Env    map[string]string
@@ -151,11 +151,6 @@ func (op *Op) Exec(ctx context.Context, fs FS, out Fillable) (FS, error) {
 	opts = append(opts, llb.WithCustomName(op.v.Path().String()))
 	// args
 	opts = append(opts, llb.Args(cmd.Args))
-	// dir
-	dir := cmd.Dir
-	if dir == "" {
-		dir = "/"
-	}
 	// env
 	for k, v := range cmd.Env {
 		opts = append(opts, llb.AddEnv(k, v))

dagger/op_test.go

@@ -17,7 +17,7 @@ func TestLocalMatch(t *testing.T) {
 	}
 	n := 0
 	err = op.Walk(func(op *Op) error {
-		n += 1
+		n++
 		return nil
 	})
 	if err != nil {
@@ -44,7 +44,7 @@ func TestCopyMatch(t *testing.T) {
 	}
 	n := 0
 	err = op.Walk(func(op *Op) error {
-		n += 1
+		n++
 		return nil
 	})
 	if err != nil {

dagger/script_test.go

@@ -18,7 +18,7 @@ func TestLocalScript(t *testing.T) {
 	}
 	n := 0
 	err = s.Walk(func(op *Op) error {
-		n += 1
+		n++
 		return nil
 	})
 	if err != nil {

dagger/spec.cue

@@ -10,14 +10,14 @@ package dagger
 // The DAG architecture has many benefits:
 //  - Because DAGs are made of nodes executing in parallel, they are easy to scale.
 //  - Because all inputs and outputs are snapshotted and content-addressed, DAGs
-//		can easily be made repeatable, can be cached aggressively, and can be replayed
-//		at will.
+//  can easily be made repeatable, can be cached aggressively, and can be replayed
+//  at will.
 //  - Because nodes are executed by the same container engine as docker-build, DAGs
-//		can be developed using any language or technology capable of running in a docker.
-//		Dockerfiles and docker images are natively supported for maximum compatibility.
+//  can be developed using any language or technology capable of running in a docker.
+//  Dockerfiles and docker images are natively supported for maximum compatibility.
 //
 //  - Because DAGs are programmed declaratively with a powerful configuration language,
-//		they are much easier to test, debug and refactor than traditional programming languages.
+//  they are much easier to test, debug and refactor than traditional programming languages.
 //
 // To execute a DAG, the dagger runtime JIT-compiles it to a low-level format called
 // llb, and executes it with buildkit.
@@ -42,11 +42,9 @@ package dagger
 // The contents of a #dagger annotation
 #ComponentConfig: {
 	// script to compute the value
-	compute?:  #Script
+	compute?: #Script
 }
 
-
-
 // Any component can be referenced as a directory, since
 // every dagger script outputs a filesystem state (aka a directory)
 #Dir: #Component
@@ -61,19 +59,19 @@ package dagger
 	do: "export"
 	// Source path in the container
 	source: string
-	format: "json"|"yaml"|*"string"|"number"|"boolean"
+	format: "json" | "yaml" | *"string" | "number" | "boolean"
 }
 
 #Local: {
-	do: "local"
-	dir: string
+	do:       "local"
+	dir:      string
 	include?: [...string] | *[]
 }
 
 // FIXME: bring back load (more efficient than copy)
 
 #Load: {
-	do: "load"
+	do:   "load"
 	from: #Component | #Script
 }
 
@@ -82,40 +80,40 @@ package dagger
 	args: [...string]
 	env?: [string]: string
 	always?: true | *false
-	dir: string | *"/"
+	dir:     string | *"/"
 	mount?: [string]: #MountTmp | #MountCache | #MountComponent | #MountScript
 }
 
-#MountTmp: "tmpfs"
+#MountTmp:   "tmpfs"
 #MountCache: "cache"
 #MountComponent: {
 	input: #Component
-	path: string | *"/"
+	path:  string | *"/"
 }
 #MountScript: {
 	input: #Script
-	path: string | *"/"
+	path:  string | *"/"
 }
 
 #FetchContainer: {
-	do: "fetch-container"
+	do:  "fetch-container"
 	ref: string
 }
 
 #FetchGit: {
-	do: "fetch-git"
+	do:     "fetch-git"
 	remote: string
-	ref: string
+	ref:    string
 }
 
 #Copy: {
-	do: "copy"
-	from: #Script | #Component
-	src?: string | *"/"
+	do:    "copy"
+	from:  #Script | #Component
+	src?:  string | *"/"
 	dest?: string | *"/"
 }
 
 #TestScript: #Script & [
-	{ do: "fetch-container", ref: "alpine:latest" },
-	{ do: "exec", args: ["echo", "hello", "world" ] }
+		{do: "fetch-container", ref: "alpine:latest"},
+		{do: "exec", args: ["echo", "hello", "world"]},
 ]

dagger/spec_test.go

@@ -81,7 +81,6 @@ func testMatch(t *testing.T, src interface{}, def string) {
 			t.Errorf("false positive: %s: %q", cmpDef, src)
 		}
 	}
-	return
 }
 
 func compile(t *testing.T, cc *Compiler, src interface{}) *Value {

dagger/ui/ui.go

@@ -8,7 +8,7 @@ import (
 
 func Fatalf(msg string, args ...interface{}) {
 	if !strings.HasSuffix(msg, "\n") {
-		msg = msg + "\n"
+		msg += "\n"
 	}
 	fmt.Fprintf(os.Stderr, msg, args...)
 	os.Exit(1)
@@ -20,7 +20,7 @@ func Fatal(msg interface{}) {
 
 func Info(msg string, args ...interface{}) {
 	if !strings.HasSuffix(msg, "\n") {
-		msg = msg + "\n"
+		msg += "\n"
 	}
 	fmt.Fprintf(os.Stderr, "[info] "+msg, args...)
 }

dagger/utils.go

@@ -2,53 +2,27 @@ package dagger
 
 import (
 	"crypto/rand"
-	"encoding/json"
 	"fmt"
 	"os"
 	"strings"
 
 	"cuelang.org/go/cue"
 	cueerrors "cuelang.org/go/cue/errors"
-	cueformat "cuelang.org/go/cue/format"
-	"github.com/moby/buildkit/client/llb"
-	"github.com/moby/buildkit/client/llb/imagemetaresolver"
 )
 
-func cuePrint(v cue.Value) (string, error) {
-	b, err := cueformat.Node(v.Syntax())
-	if err != nil {
-		return "", err
-	}
-	return string(b), nil
-}
-
 func cueErr(err error) error {
 	return fmt.Errorf("%s", cueerrors.Details(err, &cueerrors.Config{}))
 }
 
-func debugJSON(v interface{}) {
-	if os.Getenv("DEBUG") != "" {
-		e := json.NewEncoder(os.Stderr)
-		e.SetIndent("", "  ")
-		e.Encode(v)
-	}
-}
-
 func debugf(msg string, args ...interface{}) {
 	if !strings.HasSuffix(msg, "\n") {
-		msg = msg + "\n"
+		msg += "\n"
 	}
 	if os.Getenv("DEBUG") != "" {
 		fmt.Fprintf(os.Stderr, msg, args...)
 	}
 }
 
-func debug(msg string) {
-	if os.Getenv("DEBUG") != "" {
-		fmt.Fprintln(os.Stderr, msg)
-	}
-}
-
 func randomID(size int) (string, error) {
 	b := make([]byte, size)
 	_, err := rand.Read(b)
@@ -58,14 +32,6 @@ func randomID(size int) (string, error) {
 	return fmt.Sprintf("%x", b), nil
 }
 
-// LLB Helper to pull a Docker image + all its metadata
-func llbDockerImage(ref string) llb.State {
-	return llb.Image(
-		ref,
-		llb.WithMetaResolver(imagemetaresolver.Default()),
-	)
-}
-
 func cueStringsToCuePath(parts ...string) cue.Path {
 	selectors := make([]cue.Selector, 0, len(parts))
 	for _, part := range parts {
@@ -82,9 +48,3 @@ func cuePathToStrings(p cue.Path) []string {
 	}
 	return out
 }
-
-// Validate a cue path, and return a canonical version
-func cueCleanPath(p string) (string, error) {
-	cp := cue.ParsePath(p)
-	return cp.String(), cp.Err()
-}

dagger/value.go

@@ -35,7 +35,8 @@ func (v *Value) Unlock() {
 func (v *Value) Lookup(path ...string) *Value {
 	v.Lock()
 	defer v.Unlock()
-	return v.Wrap(v.Unwrap().Lookup(path...))
+
+	return v.Wrap(v.Unwrap().LookupPath(cueStringsToCuePath(path...)))
 }
 
 func (v *Value) LookupPath(p cue.Path) *Value {
@@ -176,7 +177,7 @@ func (v *Value) RangeList(fn func(int, *Value) error) error {
 		if err := fn(i, v.Wrap(it.Value())); err != nil {
 			return err
 		}
-		i += 1
+		i++
 	}
 	return nil
 }