fix: Add workaround for broken Open implementation in `CacheOnReadF…

…s` (spf13/afero#193)

cmd/stfs/cmd/serve_ftp.go

@@ -203,6 +203,7 @@ var serveFTPCmd = &cobra.Command{
 					viper.GetString(cacheWriteFlag),
 				)
 			},
+			viper.GetString(cacheFileSystemFlag) != config.NoneKey,
 
 			logger.PrintHeader,
 		)

cmd/stfs/cmd/serve_http.go

@@ -125,8 +125,9 @@ var serveHTTPCmd = &cobra.Command{
 				Metadata: metadataPersister,
 			},
 
-			"",  // We never write
-			nil, // We never write
+			"",    // We never write
+			nil,   // We never write
+			false, // We never write
 
 			logger.PrintHeader,
 		)

internal/fs/filesystem.go

@@ -32,6 +32,7 @@ type FileSystem struct {
 
 	compressionLevel string
 	getFileBuffer    func() (WriteCache, func() error, error)
+	enableHacks      bool
 
 	onHeader func(hdr *models.Header)
 }
@@ -44,6 +45,7 @@ func NewFileSystem(
 
 	compressionLevel string,
 	getFileBuffer func() (WriteCache, func() error, error),
+	enableHacks bool,
 
 	onHeader func(hdr *models.Header),
 ) afero.Fs {
@@ -55,6 +57,7 @@ func NewFileSystem(
 
 		compressionLevel: compressionLevel,
 		getFileBuffer:    getFileBuffer,
+		enableHacks:      enableHacks,
 
 		onHeader: onHeader,
 	}
@@ -185,10 +188,28 @@ func (f *FileSystem) Open(name string) (afero.File, error) {
 	)
 	if err != nil {
 		if err == sql.ErrNoRows {
-			return nil, os.ErrNotExist
+			// See https://github.com/spf13/afero/issues/193
+			if f.enableHacks {
+				if err := f.mknode(false, name, os.ModePerm); err != nil {
+					return nil, err
+				}
+
+				hdr, err = inventory.Stat(
+					f.metadata,
+
+					name,
+
+					f.onHeader,
+				)
+				if err != nil {
+					return nil, err
+				}
+			} else {
+				return nil, os.ErrNotExist
+			}
+		} else {
+			panic(err)
 		}
-
-		panic(err)
 	}
 
 	return NewFile(