feat: Implement LstatIfPossible

cmd/stfs/cmd/inventory_stat.go

@@ -9,6 +9,10 @@ import (
 	"github.com/spf13/viper"
 )
 
+const (
+	linkFlag = "link"
+)
+
 var inventoryStatCmd = &cobra.Command{
 	Use:     "stat",
 	Aliases: []string{"sta", "s"},
@@ -29,6 +33,7 @@ var inventoryStatCmd = &cobra.Command{
 			},
 
 			viper.GetString(nameFlag),
+			viper.GetBool(linkFlag),
 
 			logging.NewCSVLogger().PrintHeader,
 		); err != nil {
@@ -41,6 +46,7 @@ var inventoryStatCmd = &cobra.Command{
 
 func init() {
 	inventoryStatCmd.PersistentFlags().StringP(nameFlag, "n", "", "File or directory to get info for")
+	inventoryStatCmd.PersistentFlags().BoolP(linkFlag, "l", false, "Resolve as symlink")
 
 	viper.AutomaticEnv()
 

internal/fs/file.go

@@ -207,6 +207,7 @@ func (f *File) enterWriteMode() error {
 			f.metadata,
 
 			f.path,
+			false,
 
 			f.onHeader,
 		)

pkg/fs/filesystem.go

@@ -264,6 +264,7 @@ func (f *STFS) OpenFile(name string, flag int, perm os.FileMode) (afero.File, er
 		f.metadata,
 
 		name,
+		false,
 
 		f.onHeader,
 	)
@@ -278,6 +279,7 @@ func (f *STFS) OpenFile(name string, flag int, perm os.FileMode) (afero.File, er
 					f.metadata,
 
 					name,
+					false,
 
 					f.onHeader,
 				)
@@ -361,6 +363,7 @@ func (f *STFS) Stat(name string) (os.FileInfo, error) {
 		f.metadata,
 
 		name,
+		false,
 
 		f.onHeader,
 	)
@@ -414,6 +417,7 @@ func (f *STFS) Chmod(name string, mode os.FileMode) error {
 		f.metadata,
 
 		name,
+		false,
 
 		f.onHeader,
 	)
@@ -444,6 +448,7 @@ func (f *STFS) Chown(name string, uid, gid int) error {
 		f.metadata,
 
 		name,
+		false,
 
 		f.onHeader,
 	)
@@ -475,6 +480,7 @@ func (f *STFS) Chtimes(name string, atime time.Time, mtime time.Time) error {
 		f.metadata,
 
 		name,
+		false,
 
 		f.onHeader,
 	)
@@ -500,7 +506,23 @@ func (f *STFS) LstatIfPossible(name string) (os.FileInfo, bool, error) {
 	f.ioLock.Lock()
 	defer f.ioLock.Unlock()
 
-	return nil, false, config.ErrNotImplemented
+	hdr, err := inventory.Stat(
+		f.metadata,
+
+		name,
+		true,
+
+		f.onHeader,
+	)
+	if err != nil {
+		if err == sql.ErrNoRows {
+			return nil, true, os.ErrNotExist
+		}
+
+		return nil, true, err
+	}
+
+	return ifs.NewFileInfoFromTarHeader(hdr, f.log), true, nil
 }
 
 func (f *STFS) SymlinkIfPossible(oldname, newname string) error {

pkg/inventory/stat.go

@@ -15,11 +15,29 @@ func Stat(
 	metadata config.MetadataConfig,
 
 	name string,
+	symlink bool,
 
 	onHeader func(hdr *config.Header),
 ) (*tar.Header, error) {
 	name = filepath.ToSlash(name)
 
+	if symlink {
+		// Resolve symlink
+		link, err := metadata.Metadata.GetHeader(context.Background(), name)
+		if err != nil {
+			if err == sql.ErrNoRows {
+				link, err = metadata.Metadata.GetHeader(context.Background(), strings.TrimSuffix(name, "/")+"/")
+				if err != nil {
+					return nil, err
+				}
+			} else {
+				return nil, err
+			}
+		}
+
+		name = link.Linkname
+	}
+
 	dbhdr, err := metadata.Metadata.GetHeader(context.Background(), name)
 	if err != nil {
 		if err == sql.ErrNoRows {