fix decrompression of archives

cmd/internal/compress/compress.go

@@ -7,35 +7,54 @@ import (
 
 	"github.com/metal-stack/backup-restore-sidecar/pkg/constants"
 	"github.com/mholt/archives"
+	"github.com/spf13/afero"
 )
 
 type Compressor struct {
+	fs         afero.Fs
 	compressor *archives.CompressedArchive
 	extension  string
 }
 
+type CompressorConfig struct {
+	Method string
+	FS     afero.Fs
+}
+
 // New Returns a new Compressor
-func New(method string) (*Compressor, error) {
+func New(config *CompressorConfig) (*Compressor, error) {
+
+	if config.FS == nil {
+		config.FS = afero.NewOsFs()
+	}
+
 	c := &archives.CompressedArchive{}
-	switch method {
+	switch config.Method {
 	case "tar":
 		c = &archives.CompressedArchive{
-			Archival: archives.Tar{},
+			Archival:   archives.Tar{},
+			Extraction: archives.Tar{},
 		}
 	case "targz":
 		c = &archives.CompressedArchive{
 			Compression: archives.Gz{},
+			Extraction:  archives.Tar{},
 			Archival:    archives.Tar{},
 		}
 	case "tarlz4":
 		c = &archives.CompressedArchive{
 			Compression: archives.Lz4{},
+			Extraction:  archives.Tar{},
 			Archival:    archives.Tar{},
 		}
 	default:
-		return nil, fmt.Errorf("unsupported compression method: %s", method)
+		return nil, fmt.Errorf("unsupported compression method: %s", config.Method)
 	}
-	return &Compressor{compressor: c, extension: "." + method}, nil
+	return &Compressor{
+		compressor: c,
+		extension:  "." + config.Method,
+		fs:         config.FS,
+	}, nil
 }
 
 // Compress the given backupFile and returns the full filename with the extension
@@ -57,8 +76,20 @@ func (c *Compressor) Compress(ctx context.Context, backupFilePath string, output
 // Decompress the given backupFile
 func (c *Compressor) Decompress(ctx context.Context, inputReader io.Reader) error {
 	err := c.compressor.Extract(ctx, inputReader, func(ctx context.Context, f archives.FileInfo) error {
-		// do something with the file here; or, if you only want a specific file or directory,
-		// just return until you come across the desired f.NameInArchive value(s)
+		// open archive file
+		file, err := f.Open()
+		if err != nil {
+			return err
+		}
+		defer file.Close()
+		// create file in restore directory
+		outputFile, err := c.fs.Create(constants.RestoreDir + "/" + f.Name())
+		if err != nil {
+			return err
+		}
+		defer outputFile.Close()
+		// copy file content
+		io.Copy(outputFile, file)
 		return nil
 	})
 	return err

cmd/main.go

@@ -103,12 +103,13 @@ const (
 )
 
 var (
-	cfgFile   string
-	logger    *slog.Logger
-	db        database.Database
-	bp        providers.BackupProvider
-	encrypter *encryption.Encrypter
-	stop      context.Context
+	cfgFile    string
+	logger     *slog.Logger
+	db         database.Database
+	bp         providers.BackupProvider
+	encrypter  *encryption.Encrypter
+	compressor *compress.Compressor
+	stop       context.Context
 )
 
 var rootCmd = &cobra.Command{
@@ -135,6 +136,9 @@ var startCmd = &cobra.Command{
 		if err := initEncrypter(); err != nil {
 			return err
 		}
+		if err := initCompressor(); err != nil {
+			return err
+		}
 		return initBackupProvider()
 	},
 	RunE: func(cmd *cobra.Command, args []string) error {
@@ -153,12 +157,6 @@ var startCmd = &cobra.Command{
 
 		logger.Info("starting backup-restore-sidecar", "version", v.V, "bind-addr", addr)
 
-		comp, err := compress.New(viper.GetString(compressionMethod))
-		logger.Info(comp.Extension())
-		if err != nil {
-			return err
-		}
-
 		metrics := metrics.New()
 		metrics.Start(logger.WithGroup("metrics"))
 
@@ -168,11 +166,11 @@ var startCmd = &cobra.Command{
 			DatabaseProber: db,
 			BackupProvider: bp,
 			Metrics:        metrics,
-			Compressor:     comp,
+			Compressor:     compressor,
 			Encrypter:      encrypter,
 		})
 
-		if err := initializer.New(logger.WithGroup("initializer"), addr, db, bp, comp, metrics, viper.GetString(databaseDatadirFlg), encrypter).Start(stop, backuper); err != nil {
+		if err := initializer.New(logger.WithGroup("initializer"), addr, db, bp, compressor, metrics, viper.GetString(databaseDatadirFlg), encrypter).Start(stop, backuper); err != nil {
 			return err
 		}
 
@@ -554,6 +552,16 @@ func initDatabase() error {
 	return nil
 }
 
+func initCompressor() error {
+	var err error
+	method := viper.GetString(compressionMethod)
+	compressor, err = compress.New(&compress.CompressorConfig{Method: method})
+	if err != nil {
+		return fmt.Errorf("unable to initialize compressor: %w", err)
+	}
+	return nil
+}
+
 func initEncrypter() error {
 	var err error
 	key := viper.GetString(encryptionKeyFlg)