lint: enable forbidigo context rules

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

util/dockerutil/client.go

@@ -41,7 +41,6 @@ func (c *Client) LoadImage(ctx context.Context, name string, status progress.Wri
 	pr, pw := io.Pipe()
 	done := make(chan struct{})
 
-	ctx, cancel := context.WithCancel(ctx)
 	var w *waitingWriter
 	w = &waitingWriter{
 		PipeWriter: pw,
@@ -67,8 +66,7 @@ func (c *Client) LoadImage(ctx context.Context, name string, status progress.Wri
 				handleErr(err)
 			}
 		},
-		done:   done,
-		cancel: cancel,
+		done: done,
 	}
 	return w, func() {
 		pr.Close()
@@ -101,12 +99,11 @@ func (c *Client) features(ctx context.Context, name string) map[Feature]bool {
 
 type waitingWriter struct {
 	*io.PipeWriter
-	f      func()
-	once   sync.Once
-	mu     sync.Mutex
-	err    error
-	done   chan struct{}
-	cancel func()
+	f    func()
+	once sync.Once
+	mu   sync.Mutex
+	err  error
+	done chan struct{}
 }
 
 func (w *waitingWriter) Write(dt []byte) (int, error) {

util/gitutil/testutilserve.go

@@ -7,6 +7,7 @@ import (
 	"net/http"
 	"testing"
 
+	"github.com/pkg/errors"
 	"github.com/stretchr/testify/require"
 )
 
@@ -25,7 +26,7 @@ func WithAccessToken(token string) GitServeOpt {
 func GitServeHTTP(c *Git, t testing.TB, opts ...GitServeOpt) (url string) {
 	t.Helper()
 	gitUpdateServerInfo(c, t)
-	ctx, cancel := context.WithCancel(context.TODO())
+	ctx, cancel := context.WithCancelCause(context.TODO())
 
 	gs := &gitServe{}
 	for _, opt := range opts {
@@ -38,7 +39,7 @@ func GitServeHTTP(c *Git, t testing.TB, opts ...GitServeOpt) (url string) {
 	name := "test.git"
 	dir, err := c.GitDir()
 	if err != nil {
-		cancel()
+		cancel(err)
 	}
 
 	var addr string
@@ -84,7 +85,7 @@ func GitServeHTTP(c *Git, t testing.TB, opts ...GitServeOpt) (url string) {
 	<-ready
 
 	t.Cleanup(func() {
-		cancel()
+		cancel(errors.Errorf("cleanup"))
 		<-done
 	})
 	return fmt.Sprintf("http://%s/%s", addr, name)

util/waitmap/waitmap.go

@@ -61,7 +61,7 @@ func (m *Map) Get(ctx context.Context, keys ...string) (map[string]interface{},
 		m.mu.Unlock()
 		select {
 		case <-ctx.Done():
-			return nil, ctx.Err()
+			return nil, context.Cause(ctx)
 		case <-ch:
 			m.mu.Lock()
 		}

util/waitmap/waitmap_test.go

@@ -34,7 +34,7 @@ func TestTimeout(t *testing.T) {
 
 	m.Set("foo", "bar")
 
-	ctx, cancel := context.WithTimeout(context.TODO(), 100*time.Millisecond)
+	ctx, cancel := context.WithTimeoutCause(context.TODO(), 100*time.Millisecond, nil)
 	defer cancel()
 
 	_, err := m.Get(ctx, "bar")