Avoid a test dependency on github.com/otiai10/copy

Signed-off-by: Miloslav Trmač <[email protected]>

go.mod

@@ -26,7 +26,6 @@ require (
 	github.com/opencontainers/image-spec v1.1.0
 	github.com/opencontainers/selinux v1.11.0
 	github.com/ostreedev/ostree-go v0.0.0-20210805093236-719684c64e4f
-	github.com/otiai10/copy v1.14.0
 	github.com/proglottis/gpgme v0.1.3
 	github.com/secure-systems-lab/go-securesystemslib v0.8.0
 	github.com/sigstore/fulcio v1.4.3

go.sum

@@ -317,9 +317,6 @@ github.com/opentracing/opentracing-go v1.2.0 h1:uEJPy/1a5RIPAJ0Ov+OIO8OxWu77jEv+
 github.com/opentracing/opentracing-go v1.2.0/go.mod h1:GxEUsuufX4nBwe+T+Wl9TAgYrxe9dPLANfrWvHYVTgc=
 github.com/ostreedev/ostree-go v0.0.0-20210805093236-719684c64e4f h1:/UDgs8FGMqwnHagNDPGOlts35QkhAZ8by3DR7nMih7M=
 github.com/ostreedev/ostree-go v0.0.0-20210805093236-719684c64e4f/go.mod h1:J6OG6YJVEWopen4avK3VNQSnALmmjvniMmni/YFYAwc=
-github.com/otiai10/copy v1.14.0 h1:dCI/t1iTdYGtkvCuBG2BgR6KZa83PTclw4U5n2wAllU=
-github.com/otiai10/copy v1.14.0/go.mod h1:ECfuL02W+/FkTWZWgQqXPWZgW9oeKCSQ5qVfSc4qc4w=
-github.com/otiai10/mint v1.5.1 h1:XaPLeE+9vGbuyEHem1JNk3bYc7KKqyI/na0/mLd/Kks=
 github.com/pelletier/go-toml v1.7.0/go.mod h1:vwGMzjaWMwyfHwgIBhI2YUM4fB6nL6lVAvS1LBMMhTE=
 github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=

oci/layout/oci_delete_test.go

@@ -3,14 +3,15 @@ package layout
 import (
 	"context"
 	"fmt"
+	"io"
+	"io/fs"
 	"os"
 	"path/filepath"
 	"testing"
 
 	"github.com/containers/image/v5/types"
 	digest "github.com/opencontainers/go-digest"
 	imgspecv1 "github.com/opencontainers/image-spec/specs-go/v1"
-	cp "github.com/otiai10/copy"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
@@ -275,10 +276,46 @@ func TestReferenceDeleteImage_multipleImages_twoIdenticalReferences(t *testing.T
 }
 
 func loadFixture(t *testing.T, fixtureName string) string {
-	tmpDir := t.TempDir()
-	err := cp.Copy(fmt.Sprintf("fixtures/%v/", fixtureName), tmpDir)
+	destDir := t.TempDir()
+	srcDir := filepath.Join("fixtures", fixtureName)
+	err := filepath.WalkDir(srcDir, func(path string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+		relPath, err := filepath.Rel(srcDir, path)
+		if err != nil {
+			return err
+		}
+		destPath := filepath.Join(destDir, relPath)
+		switch d.Type() {
+		case fs.ModeDir:
+			if err := os.MkdirAll(destPath, 0o700); err != nil {
+				return err
+			}
+		case 0: // regular file
+			src, err := os.Open(path)
+			if err != nil {
+				return err
+			}
+			defer src.Close()
+			dest, err := os.OpenFile(destPath, os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0o600)
+			if err != nil {
+				return err
+			}
+			if _, err := io.Copy(dest, src); err != nil {
+				_ = dest.Close()
+				return err
+			}
+			if err := dest.Close(); err != nil {
+				return err
+			}
+		default:
+			return fmt.Errorf("unexpected file type %#v", d.Type())
+		}
+		return nil
+	})
 	require.NoError(t, err)
-	return tmpDir
+	return destDir
 }
 
 func assertBlobExists(t *testing.T, blobsDir string, blobDigest string) {