Improve errors

pkg/skaffold/build/tag/custom.go

@@ -17,6 +17,7 @@ limitations under the License.
 package tag
 
 import (
+	"errors"
 	"fmt"
 
 	"github.com/GoogleContainerTools/skaffold/pkg/skaffold/constants"
@@ -35,11 +36,13 @@ func (c *CustomTag) Labels() map[string]string {
 // GenerateFullyQualifiedImageName tags an image with the custom tag
 func (c *CustomTag) GenerateFullyQualifiedImageName(workingDir string, opts *Options) (string, error) {
 	if opts == nil {
-		return "", fmt.Errorf("Tag options not provided")
+		return "", errors.New("tag options not provided")
 	}
+
 	tag := c.Tag
 	if tag == "" {
-		return "", fmt.Errorf("Custom tag not provided")
+		return "", errors.New("custom tag not provided")
 	}
+
 	return fmt.Sprintf("%s:%s", opts.ImageName, tag), nil
 }

pkg/skaffold/build/tag/sha256.go

@@ -21,6 +21,7 @@ import (
 	"strings"
 
 	"github.com/GoogleContainerTools/skaffold/pkg/skaffold/constants"
+	"github.com/pkg/errors"
 )
 
 // ChecksumTagger tags an image by the sha256 of the image tarball
@@ -36,13 +37,13 @@ func (c *ChecksumTagger) Labels() map[string]string {
 // GenerateFullyQualifiedImageName tags an image with the supplied image name and the sha256 checksum of the image
 func (c *ChecksumTagger) GenerateFullyQualifiedImageName(workingDir string, opts *Options) (string, error) {
 	if opts == nil {
-		return "", fmt.Errorf("Tag options not provided")
+		return "", errors.New("tag options not provided")
 	}
 
 	digest := opts.Digest
 	sha256 := strings.TrimPrefix(opts.Digest, "sha256:")
 	if sha256 == digest {
-		return "", fmt.Errorf("Digest wrong format: %s, expected sha256:<checksum>", digest)
+		return "", fmt.Errorf("digest wrong format: %s, expected sha256:<checksum>", digest)
 	}
 
 	return fmt.Sprintf("%s:%s", opts.ImageName, sha256), nil

pkg/skaffold/deploy/labels.go

@@ -193,7 +193,7 @@ func groupVersionResource(disco discovery.DiscoveryInterface, gvk schema.GroupVe
 		}
 	}
 
-	return schema.GroupVersionResource{}, fmt.Errorf("Could not find resource for %s", gvk.String())
+	return schema.GroupVersionResource{}, fmt.Errorf("could not find resource for %s", gvk.String())
 }
 
 func copyMap(dest, from map[string]string) {

pkg/skaffold/docker/client.go

@@ -77,7 +77,7 @@ func newAPIClient(kubeContext string) (APIClient, error) {
 func newEnvAPIClient() (APIClient, error) {
 	cli, err := client.NewClientWithOpts(client.FromEnv)
 	if err != nil {
-		return nil, fmt.Errorf("Error getting docker client: %s", err)
+		return nil, fmt.Errorf("error getting docker client: %s", err)
 	}
 	cli.NegotiateAPIVersion(context.Background())
 
@@ -144,10 +144,10 @@ func getMiniKubeFilename() (string, error) {
 	if found, _ := detectWsl(); found {
 		filename, err := exec.LookPath("minikube.exe")
 		if err != nil {
-			return "", fmt.Errorf("Unable to find minikube.exe. Please add it to PATH environment variable")
+			return "", errors.New("unable to find minikube.exe. Please add it to PATH environment variable")
 		}
 		if _, err := os.Stat(filename); os.IsNotExist(err) {
-			return "", fmt.Errorf("Unable to find minikube.exe. File not found %s", filename)
+			return "", fmt.Errorf("unable to find minikube.exe. File not found %s", filename)
 		}
 		return filename, nil
 	}
@@ -172,7 +172,7 @@ func getMinikubeDockerEnv() (map[string]string, error) {
 		}
 		kv := strings.Split(line, "=")
 		if len(kv) != 2 {
-			return nil, fmt.Errorf("Unable to parse minikube docker-env keyvalue: %s, line: %s, output: %s", kv, line, string(out))
+			return nil, fmt.Errorf("unable to parse minikube docker-env keyvalue: %s, line: %s, output: %s", kv, line, string(out))
 		}
 		env[kv[0]] = kv[1]
 	}
@@ -183,7 +183,7 @@ func getMinikubeDockerEnv() (map[string]string, error) {
 		if err == nil {
 			env["DOCKER_CERT_PATH"] = strings.TrimRight(string(out), "\n")
 		} else {
-			return nil, fmt.Errorf("Can't run wslpath: %s", err)
+			return nil, fmt.Errorf("can't run wslpath: %s", err)
 		}
 	}
 

pkg/skaffold/docker/parse_test.go

@@ -194,7 +194,7 @@ func (f *fakeImageFetcher) fetch(image string) (*v1.ConfigFile, error) {
 		}, nil
 	}
 
-	return nil, fmt.Errorf("No image found for %s", image)
+	return nil, fmt.Errorf("no image found for %s", image)
 }
 
 func TestGetDependencies(t *testing.T) {

pkg/skaffold/kubernetes/client.go

@@ -42,7 +42,7 @@ func getClientConfig() (*restclient.Config, error) {
 	kubeConfig := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(loadingRules, &clientcmd.ConfigOverrides{})
 	clientConfig, err := kubeConfig.ClientConfig()
 	if err != nil {
-		return nil, fmt.Errorf("Error creating kubeConfig: %s", err)
+		return nil, fmt.Errorf("error creating kubeConfig: %s", err)
 	}
 	return clientConfig, nil
 }

pkg/skaffold/kubernetes/port_forward.go

@@ -89,7 +89,7 @@ func (*kubectlForwarder) Forward(pfe *portForwardEntry) error {
 func (*kubectlForwarder) Stop(p *portForwardEntry) error {
 	logrus.Debugf("Terminating port-forward %s", p)
 	if p.cmd == nil {
-		return fmt.Errorf("No port-forward command found for %s", p)
+		return fmt.Errorf("no port-forward command found for %s", p)
 	}
 	if err := p.cmd.Process.Signal(syscall.SIGTERM); err != nil {
 		return errors.Wrap(err, "terminating port-forward process")

pkg/skaffold/runner/runner.go

@@ -81,22 +81,22 @@ func NewForConfig(opts *config.SkaffoldOptions, cfg *latest.SkaffoldPipeline) (*
 
 	tagger, err := getTagger(cfg.Build.TagPolicy, opts.CustomTag)
 	if err != nil {
-		return nil, errors.Wrap(err, "parsing skaffold tag config")
+		return nil, errors.Wrap(err, "parsing tag config")
 	}
 
 	builder, err := getBuilder(&cfg.Build, kubeContext)
 	if err != nil {
-		return nil, errors.Wrap(err, "parsing skaffold build config")
+		return nil, errors.Wrap(err, "parsing build config")
 	}
 
 	tester, err := getTester(&cfg.Test)
 	if err != nil {
-		return nil, errors.Wrap(err, "parsing skaffold test config")
+		return nil, errors.Wrap(err, "parsing test config")
 	}
 
 	deployer, err := getDeployer(&cfg.Deploy, kubeContext, opts.Namespace, defaultRepo)
 	if err != nil {
-		return nil, errors.Wrap(err, "parsing skaffold deploy config")
+		return nil, errors.Wrap(err, "parsing deploy config")
 	}
 
 	deployer = deploy.WithLabels(deployer, opts, builder, deployer, tagger)
@@ -141,7 +141,7 @@ func getBuilder(cfg *latest.BuildConfig, kubeContext string) (build.Builder, err
 		return acr.NewBuilder(cfg.AzureContainerBuild), nil
 
 	default:
-		return nil, fmt.Errorf("Unknown builder for config %+v", cfg)
+		return nil, fmt.Errorf("unknown builder for config %+v", cfg)
 	}
 }
 
@@ -201,7 +201,7 @@ func getTagger(t latest.TagPolicy, customTag string) (tag.Tagger, error) {
 		return tag.NewDateTimeTagger(t.DateTimeTagger.Format, t.DateTimeTagger.TimeZone), nil
 
 	default:
-		return nil, fmt.Errorf("Unknown tagger for strategy %+v", t)
+		return nil, fmt.Errorf("unknown tagger for strategy %+v", t)
 	}
 }
 

pkg/skaffold/util/util.go

@@ -85,7 +85,7 @@ func ExpandPathsGlob(workingDir string, paths []string) ([]string, error) {
 			return nil, errors.Wrap(err, "glob")
 		}
 		if files == nil {
-			return nil, fmt.Errorf("File pattern must match at least one file %s", path)
+			return nil, fmt.Errorf("file pattern must match at least one file %s", path)
 		}
 
 		for _, f := range files {

testutil/cmd_helper.go

@@ -46,11 +46,11 @@ func NewFakeCmdOut(expectedCommand, stdout string, err error) *FakeCmd {
 func (f *FakeCmd) RunCmdOut(cmd *exec.Cmd) ([]byte, error) {
 	actualCommand := strings.Join(cmd.Args, " ")
 	if f.expectedCommand != actualCommand {
-		return nil, fmt.Errorf("Expected: %s. Got: %s", f.expectedCommand, actualCommand)
+		return nil, fmt.Errorf("expected: %s. Got: %s", f.expectedCommand, actualCommand)
 	}
 
 	if f.stdout == nil {
-		return nil, fmt.Errorf("Expected RunCmd(%s) to be called. Got RunCmdOut(%s)", f.expectedCommand, actualCommand)
+		return nil, fmt.Errorf("expected RunCmd(%s) to be called. Got RunCmdOut(%s)", f.expectedCommand, actualCommand)
 	}
 
 	return f.stdout, f.err
@@ -59,11 +59,11 @@ func (f *FakeCmd) RunCmdOut(cmd *exec.Cmd) ([]byte, error) {
 func (f *FakeCmd) RunCmd(cmd *exec.Cmd) error {
 	actualCommand := strings.Join(cmd.Args, " ")
 	if f.expectedCommand != actualCommand {
-		return fmt.Errorf("Expected: %s. Got: %s", f.expectedCommand, actualCommand)
+		return fmt.Errorf("expected: %s. Got: %s", f.expectedCommand, actualCommand)
 	}
 
 	if f.stdout != nil {
-		return fmt.Errorf("Expected RunCmdOut(%s) to be called. Got RunCmd(%s)", f.expectedCommand, actualCommand)
+		return fmt.Errorf("expected RunCmdOut(%s) to be called. Got RunCmd(%s)", f.expectedCommand, actualCommand)
 	}
 
 	return f.err

testutil/util.go

@@ -17,6 +17,7 @@ limitations under the License.
 package testutil
 
 import (
+	"errors"
 	"fmt"
 	"net/http"
 	"net/http/httptest"
@@ -29,11 +30,11 @@ import (
 
 type BadReader struct{}
 
-func (BadReader) Read([]byte) (int, error) { return 0, fmt.Errorf("Bad read") }
+func (BadReader) Read([]byte) (int, error) { return 0, errors.New("bad read") }
 
 type BadWriter struct{}
 
-func (BadWriter) Write([]byte) (int, error) { return 0, fmt.Errorf("Bad write") }
+func (BadWriter) Write([]byte) (int, error) { return 0, errors.New("bad write") }
 
 type FakeReaderCloser struct {
 	Err error
@@ -86,10 +87,10 @@ func CheckError(t *testing.T, shouldErr bool, err error) {
 
 func checkErr(shouldErr bool, err error) error {
 	if err == nil && shouldErr {
-		return fmt.Errorf("Expected error, but returned none")
+		return errors.New("expected error, but returned none")
 	}
 	if err != nil && !shouldErr {
-		return fmt.Errorf("Unexpected error: %s", err)
+		return fmt.Errorf("unexpected error: %s", err)
 	}
 	return nil
 }