github.com/dtroyer-salad/og2/v2@v2.0.0-20240412154159-c47231610877/content/file/file_unix_test.go

//go:build !windows

/*
Copyright The ORAS Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package file

import (
	"bytes"
	"context"
	"os"
	"path/filepath"
	"testing"

	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
	"oras.land/oras-go/v2"
)

// Related issue: https://github.com/oras-project/oras-go/issues/402
func TestStore_Dir_ExtractSymlinkRel(t *testing.T) {
	// prepare test content
	tempDir := t.TempDir()
	dirName := "testdir"
	dirPath := filepath.Join(tempDir, dirName)
	if err := os.MkdirAll(dirPath, 0777); err != nil {
		t.Fatal("error calling Mkdir(), error =", err)
	}

	content := []byte("hello world")
	fileName := "test.txt"
	filePath := filepath.Join(dirPath, fileName)
	if err := os.WriteFile(filePath, content, 0444); err != nil {
		t.Fatal("error calling WriteFile(), error =", err)
	}
	// create symlink to a relative path
	symlinkName := "test_symlink"
	symlinkPath := filepath.Join(dirPath, symlinkName)
	if err := os.Symlink(fileName, symlinkPath); err != nil {
		t.Fatal("error calling Symlink(), error =", err)
	}

	src, err := New(tempDir)
	if err != nil {
		t.Fatal("Store.New() error =", err)
	}
	defer src.Close()
	ctx := context.Background()

	// add dir
	desc, err := src.Add(ctx, dirName, "", dirPath)
	if err != nil {
		t.Fatal("Store.Add() error =", err)
	}
	// pack a manifest
	manifestDesc, err := oras.Pack(ctx, src, "dir", []ocispec.Descriptor{desc}, oras.PackOptions{})
	if err != nil {
		t.Fatal("oras.Pack() error =", err)
	}

	// copy to another file store created from an absolute root, to trigger extracting directory
	tempDir = t.TempDir()
	dstAbs, err := New(tempDir)
	if err != nil {
		t.Fatal("Store.New() error =", err)
	}
	defer dstAbs.Close()
	if err := oras.CopyGraph(ctx, src, dstAbs, manifestDesc, oras.DefaultCopyGraphOptions); err != nil {
		t.Fatal("oras.CopyGraph() error =", err)
	}

	// verify extracted symlink
	extractedSymlink := filepath.Join(tempDir, dirName, symlinkName)
	symlinkDst, err := os.Readlink(extractedSymlink)
	if err != nil {
		t.Fatal("failed to get symlink destination, error =", err)
	}
	if want := fileName; symlinkDst != want {
		t.Errorf("symlink destination = %v, want %v", symlinkDst, want)
	}
	got, err := os.ReadFile(extractedSymlink)
	if err != nil {
		t.Fatal("failed to read symlink file, error =", err)
	}
	if !bytes.Equal(got, content) {
		t.Errorf("symlink content = %v, want %v", got, content)
	}

	// copy to another file store created from a relative root, to trigger extracting directory
	tempDir = t.TempDir()
	if err := os.Chdir(tempDir); err != nil {
		t.Fatal("error calling Chdir(), error=", err)
	}
	dstRel, err := New(".")
	if err != nil {
		t.Fatal("Store.New() error =", err)
	}
	defer dstRel.Close()
	if err := oras.CopyGraph(ctx, src, dstRel, manifestDesc, oras.DefaultCopyGraphOptions); err != nil {
		t.Fatal("oras.CopyGraph() error =", err)
	}

	// verify extracted symlink
	extractedSymlink = filepath.Join(tempDir, dirName, symlinkName)
	symlinkDst, err = os.Readlink(extractedSymlink)
	if err != nil {
		t.Fatal("failed to get symlink destination, error =", err)
	}
	if want := fileName; symlinkDst != want {
		t.Errorf("symlink destination = %v, want %v", symlinkDst, want)
	}
	got, err = os.ReadFile(extractedSymlink)
	if err != nil {
		t.Fatal("failed to read symlink file, error =", err)
	}
	if !bytes.Equal(got, content) {
		t.Errorf("symlink content = %v, want %v", got, content)
	}
}

// Related issue: https://github.com/oras-project/oras-go/issues/402
func TestStore_Dir_ExtractSymlinkAbs(t *testing.T) {
	// prepare test content
	tempDir, err := filepath.EvalSymlinks(t.TempDir())
	if err != nil {
		t.Fatal("error calling filepath.EvalSymlinks(), error =", err)
	}
	dirName := "testdir"
	dirPath := filepath.Join(tempDir, dirName)
	if err := os.MkdirAll(dirPath, 0777); err != nil {
		t.Fatal("error calling Mkdir(), error =", err)
	}

	content := []byte("hello world")
	fileName := "test.txt"
	filePath := filepath.Join(dirPath, fileName)
	if err := os.WriteFile(filePath, content, 0444); err != nil {
		t.Fatal("error calling WriteFile(), error =", err)
	}
	// create symlink to an absolute path
	symlink := filepath.Join(dirPath, "test_symlink")
	if err := os.Symlink(filePath, symlink); err != nil {
		t.Fatal("error calling Symlink(), error =", err)
	}

	src, err := New(tempDir)
	if err != nil {
		t.Fatal("Store.New() error =", err)
	}
	defer src.Close()
	ctx := context.Background()

	// add dir
	desc, err := src.Add(ctx, dirName, "", dirPath)
	if err != nil {
		t.Fatal("Store.Add() error =", err)
	}
	// pack a manifest
	manifestDesc, err := oras.Pack(ctx, src, "dir", []ocispec.Descriptor{desc}, oras.PackOptions{})
	if err != nil {
		t.Fatal("oras.Pack() error =", err)
	}

	// remove the original testing directory and create a new store using an absolute root
	if err := os.RemoveAll(dirPath); err != nil {
		t.Fatal("error calling RemoveAll(), error =", err)
	}
	dstAbs, err := New(tempDir)
	if err != nil {
		t.Fatal("Store.New() error =", err)
	}
	defer dstAbs.Close()
	if err := oras.CopyGraph(ctx, src, dstAbs, manifestDesc, oras.DefaultCopyGraphOptions); err != nil {
		t.Fatal("oras.CopyGraph() error =", err)
	}

	// verify extracted symlink
	symlinkDst, err := os.Readlink(symlink)
	if err != nil {
		t.Fatal("failed to get symlink destination, error =", err)
	}
	if want := filePath; symlinkDst != want {
		t.Errorf("symlink destination = %v, want %v", symlinkDst, want)
	}
	got, err := os.ReadFile(symlink)
	if err != nil {
		t.Fatal("failed to read symlink file, error =", err)
	}
	if !bytes.Equal(got, content) {
		t.Errorf("symlink content = %v, want %v", got, content)
	}

	// remove the original testing directory and create a new store using a relative path
	if err := os.RemoveAll(dirPath); err != nil {
		t.Fatal("error calling RemoveAll(), error =", err)
	}
	if err := os.Chdir(tempDir); err != nil {
		t.Fatal("error calling Chdir(), error=", err)
	}
	dstRel, err := New(".")
	if err != nil {
		t.Fatal("Store.New() error =", err)
	}
	defer dstRel.Close()
	if err := oras.CopyGraph(ctx, src, dstRel, manifestDesc, oras.DefaultCopyGraphOptions); err != nil {
		t.Fatal("oras.CopyGraph() error =", err)
	}

	// verify extracted symlink
	symlinkDst, err = os.Readlink(symlink)
	if err != nil {
		t.Fatal("failed to get symlink destination, error =", err)
	}
	if want := filePath; symlinkDst != want {
		t.Errorf("symlink destination = %v, want %v", symlinkDst, want)
	}
	got, err = os.ReadFile(symlink)
	if err != nil {
		t.Fatal("failed to read symlink file, error =", err)
	}
	if !bytes.Equal(got, content) {
		t.Errorf("symlink content = %v, want %v", got, content)
	}

	// copy to another file store created from an outside root, to trigger extracting directory
	tempDir = t.TempDir()
	dstOutside, err := New(tempDir)
	if err != nil {
		t.Fatal("Store.New() error =", err)
	}
	defer dstOutside.Close()
	if err := oras.CopyGraph(ctx, src, dstOutside, manifestDesc, oras.DefaultCopyGraphOptions); err == nil {
		t.Error("oras.CopyGraph() error = nil, wantErr ", true)
	}
}