deps: remove deprecated github.com/pkg/errors

.golangci.yml

@@ -5,8 +5,10 @@ linters:
   disable-all: true
   enable:
     - dupl
+    - errorlint
     - gofmt
     - goimports
+    - gomodguard
     - gosimple
     - govet
     - ineffassign
@@ -19,5 +21,12 @@ linters:
 linters-settings:
   gofmt:
     simplify: true
+  gomodguard:
+    blocked:
+      modules:
+        - github.com/pkg/errors:
+            recommendations:
+              - errors
+              - fmt
   dupl:
     threshold: 400

go.mod

@@ -4,7 +4,6 @@ go 1.18
 
 require (
 	github.com/opencontainers/go-digest v1.0.0
-	github.com/pkg/errors v0.9.1
 	github.com/russross/blackfriday v1.6.0
 	github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415
 	github.com/xeipuuv/gojsonschema v1.2.0

go.sum

@@ -3,8 +3,6 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/opencontainers/go-digest v1.0.0 h1:apOUWs51W5PlhuyGyz9FCeeBIOUDA/6nW8Oi/yOhh5U=
 github.com/opencontainers/go-digest v1.0.0/go.mod h1:0JzlMkj0TRzQZfJkVvzbP0HBR3IKzErnv2BNG4W4MAM=
-github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
-github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/russross/blackfriday v1.6.0 h1:KqfZb0pUVN2lYqZUYRddxF4OR8ZMURnJIG5Y3VRLtww=

schema/error.go

@@ -17,6 +17,7 @@ package schema
 import (
 	"bufio"
 	"encoding/json"
+	"errors"
 	"io"
 )
 
@@ -34,7 +35,8 @@ func (e *SyntaxError) Error() string { return e.msg }
 // and converts it into a *schema.SyntaxError containing line/col information using the given reader.
 // If the given error is not a *json.SyntaxError it is returned unchanged.
 func WrapSyntaxError(r io.Reader, err error) error {
-	if serr, ok := err.(*json.SyntaxError); ok {
+	var serr *json.SyntaxError
+	if errors.As(err, &serr) {
 		buf := bufio.NewReader(r)
 		line := 0
 		col := 0

schema/spec_test.go

@@ -16,6 +16,7 @@ package schema_test
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"io"
 	"net/url"
@@ -26,7 +27,6 @@ import (
 	"testing"
 
 	"github.com/opencontainers/image-spec/schema"
-	"github.com/pkg/errors"
 	"github.com/russross/blackfriday"
 )
 
@@ -93,7 +93,7 @@ func validate(t *testing.T, name string) {
 	}
 
 	for _, example := range examples {
-		if example.Err == errFormatInvalid && example.Mediatype == "" { // ignore
+		if errors.Is(example.Err, errFormatInvalid) && example.Mediatype == "" { // ignore
 			continue
 		}
 
@@ -111,7 +111,8 @@ func validate(t *testing.T, name string) {
 		}
 
 		var errs []error
-		if verr, ok := errors.Cause(err).(schema.ValidationError); ok {
+		var verr schema.ValidationError
+		if errors.As(err, &verr) {
 			errs = verr.Errs
 		} else {
 			printFields(t, "error", example.Mediatype, example.Title, err)

schema/validator.go

@@ -17,13 +17,13 @@ package schema
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"regexp"
 
 	digest "github.com/opencontainers/go-digest"
 	v1 "github.com/opencontainers/image-spec/specs-go/v1"
-	"github.com/pkg/errors"
 	"github.com/xeipuuv/gojsonschema"
 )
 
@@ -53,7 +53,7 @@ func (e ValidationError) Error() string {
 func (v Validator) Validate(src io.Reader) error {
 	buf, err := io.ReadAll(src)
 	if err != nil {
-		return errors.Wrap(err, "unable to read the document file")
+		return fmt.Errorf("unable to read the document file: %w", err)
 	}
 
 	if f, ok := mapValidate[v]; ok {
@@ -71,9 +71,8 @@ func (v Validator) Validate(src io.Reader) error {
 
 	result, err := gojsonschema.Validate(sl, ml)
 	if err != nil {
-		return errors.Wrapf(
-			WrapSyntaxError(bytes.NewReader(buf), err),
-			"schema %s: unable to validate", v)
+		return fmt.Errorf("schema %s: unable to validate: %w", v,
+			WrapSyntaxError(bytes.NewReader(buf), err))
 	}
 
 	if result.Valid() {
@@ -101,12 +100,12 @@ func validateManifest(r io.Reader) error {
 
 	buf, err := io.ReadAll(r)
 	if err != nil {
-		return errors.Wrapf(err, "error reading the io stream")
+		return fmt.Errorf("error reading the io stream: %w", err)
 	}
 
 	err = json.Unmarshal(buf, &header)
 	if err != nil {
-		return errors.Wrap(err, "manifest format mismatch")
+		return fmt.Errorf("manifest format mismatch: %w", err)
 	}
 
 	if header.Config.MediaType != string(v1.MediaTypeImageConfig) {
@@ -131,16 +130,16 @@ func validateDescriptor(r io.Reader) error {
 
 	buf, err := io.ReadAll(r)
 	if err != nil {
-		return errors.Wrapf(err, "error reading the io stream")
+		return fmt.Errorf("error reading the io stream: %w", err)
 	}
 
 	err = json.Unmarshal(buf, &header)
 	if err != nil {
-		return errors.Wrap(err, "descriptor format mismatch")
+		return fmt.Errorf("descriptor format mismatch: %w", err)
 	}
 
 	err = header.Digest.Validate()
-	if err == digest.ErrDigestUnsupported {
+	if errors.Is(err, digest.ErrDigestUnsupported) {
 		// we ignore unsupported algorithms
 		fmt.Printf("warning: unsupported digest: %q: %v\n", header.Digest, err)
 		return nil
@@ -153,12 +152,12 @@ func validateIndex(r io.Reader) error {
 
 	buf, err := io.ReadAll(r)
 	if err != nil {
-		return errors.Wrapf(err, "error reading the io stream")
+		return fmt.Errorf("error reading the io stream: %w", err)
 	}
 
 	err = json.Unmarshal(buf, &header)
 	if err != nil {
-		return errors.Wrap(err, "index format mismatch")
+		return fmt.Errorf("index format mismatch: %w", err)
 	}
 
 	for _, manifest := range header.Manifests {
@@ -180,12 +179,12 @@ func validateConfig(r io.Reader) error {
 
 	buf, err := io.ReadAll(r)
 	if err != nil {
-		return errors.Wrapf(err, "error reading the io stream")
+		return fmt.Errorf("error reading the io stream: %w", err)
 	}
 
 	err = json.Unmarshal(buf, &header)
 	if err != nil {
-		return errors.Wrap(err, "config format mismatch")
+		return fmt.Errorf("config format mismatch: %w", err)
 	}
 
 	checkPlatform(header.OS, header.Architecture)
@@ -194,7 +193,7 @@ func validateConfig(r io.Reader) error {
 	envRegexp := regexp.MustCompile(`^[^=]+=.*$`)
 	for _, e := range header.Config.Env {
 		if !envRegexp.MatchString(e) {
-			return errors.Errorf("unexpected env: %q", e)
+			return fmt.Errorf("unexpected env: %q", e)
 		}
 	}