works but has a weird bug

mfer/manifest.go

@@ -1,6 +1,7 @@
 package mfer
 
 import (
+	"fmt"
 	"io"
 	"io/fs"
 
@@ -13,16 +14,22 @@ type ManifestFile struct {
 }
 
 type Manifest struct {
-	SourceFS afero.Fs
-	Files    []*ManifestFile
+	SourceFS      afero.Fs
+	Files         []*ManifestFile
+	TotalFileSize int64
 }
 
-func NewFromPath(inputPath string) (*Manifest, error) {
+type ManifestScanOptions struct {
+	IgnoreDotfiles bool
+	FollowSymLinks bool
+}
+
+func NewFromPath(inputPath string, options *ManifestScanOptions) (*Manifest, error) {
 	afs := afero.NewBasePathFs(afero.NewOsFs(), inputPath)
-	return NewFromFilesystem(afs)
+	return NewFromFilesystem(afs, options)
 }
 
-func NewFromFilesystem(fs afero.Fs) (*Manifest, error) {
+func NewFromFilesystem(fs afero.Fs, options *ManifestScanOptions) (*Manifest, error) {
 	m := &Manifest{
 		SourceFS: fs,
 	}
@@ -32,11 +39,24 @@ func NewFromFilesystem(fs afero.Fs) (*Manifest, error) {
 
 func (m *Manifest) Scan() {
 	afero.Walk(m.SourceFS, "", func(path string, info fs.FileInfo, err error) error {
+
+		if info != nil && info.IsDir() {
+			// manifests contain only files, directories are implied.
+			return nil
+		}
+
+		fmt.Printf("path = %s\n", path)
+		fileinfo, staterr := m.SourceFS.Stat(path)
+		if staterr != nil {
+			panic(staterr)
+		}
+
 		nf := &ManifestFile{
 			Path:     path,
-			FileInfo: info,
+			FileInfo: fileinfo,
 		}
 		m.Files = append(m.Files, nf)
+		m.TotalFileSize = m.TotalFileSize + info.Size()
 		return nil
 	})
 }