From 9f5c1b9818af926d181601485ca027babf55f57b Mon Sep 17 00:00:00 2001
From: Felicitas Pojtinger <felicitas@pojtinger.com>
Date: Sat, 25 Dec 2021 20:44:27 +0100
Subject: [PATCH] fix: Add workaround for broken `Open` implementation in
 `CacheOnReadFs` (https://github.com/spf13/afero/issues/193)

---
 cmd/stfs/cmd/serve_ftp.go  |  1 +
 cmd/stfs/cmd/serve_http.go |  5 +++--
 internal/fs/filesystem.go  | 27 ++++++++++++++++++++++++---
 3 files changed, 28 insertions(+), 5 deletions(-)

diff --git a/cmd/stfs/cmd/serve_ftp.go b/cmd/stfs/cmd/serve_ftp.go
index 5dc5d8a..90e3620 100644
--- a/cmd/stfs/cmd/serve_ftp.go
+++ b/cmd/stfs/cmd/serve_ftp.go
@@ -203,6 +203,7 @@ var serveFTPCmd = &cobra.Command{
 					viper.GetString(cacheWriteFlag),
 				)
 			},
+			viper.GetString(cacheFileSystemFlag) != config.NoneKey,
 
 			logger.PrintHeader,
 		)
diff --git a/cmd/stfs/cmd/serve_http.go b/cmd/stfs/cmd/serve_http.go
index 0feeebd..0cc1953 100644
--- a/cmd/stfs/cmd/serve_http.go
+++ b/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,
 		)
diff --git a/internal/fs/filesystem.go b/internal/fs/filesystem.go
index c86b453..11cf037 100644
--- a/internal/fs/filesystem.go
+++ b/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
+				}
 
-		panic(err)
+				hdr, err = inventory.Stat(
+					f.metadata,
+
+					name,
+
+					f.onHeader,
+				)
+				if err != nil {
+					return nil, err
+				}
+			} else {
+				return nil, os.ErrNotExist
+			}
+		} else {
+			panic(err)
+		}
 	}
 
 	return NewFile(