1 files changed, 22 insertions, 4 deletions

diff --git a/fs/os.go b/fs/os.go
index f251c66..0a4f614 100644
--- a/fs/os.go
+++ b/fs/os.go
@@ -3,9 +3,14 @@ package fs
 import (
 	"io"
 	"os"
+	"strings"
 	"time"
 )
 
+func pathJoin(parts ...string) string {
+	return strings.Join(parts, string(os.PathSeparator))
+}
+
 func openOSFile(path string) (osFile, error) {
 	fi, err := os.Lstat(path)
 	if err != nil {
@@ -79,7 +84,7 @@ func (f osFile) Readdir() (list []File, err error) {
 		}
 
 		list = append(list, osFile{
-			fullpath: f.fullpath + string(os.PathSeparator) + fi.Name(),
+			fullpath: pathJoin(f.fullpath, fi.Name()),
 			fi:       fi,
 		})
 	}
@@ -87,6 +92,15 @@ func (f osFile) Readdir() (list []File, err error) {
 	return
 }
 
+func (f osFile) GetChild(name string) (File, error) {
+	path := pathJoin(f.fullpath, name)
+	fi, err := os.Lstat(path)
+	if err != nil {
+		return nil, err
+	}
+	return osFile{path, fi}, nil
+}
+
 func perms(executable bool) os.FileMode {
 	if executable {
 		return 0755
@@ -96,7 +110,7 @@ func perms(executable bool) os.FileMode {
 }
 
 func (f osFile) CreateChildFile(name string, exec bool) (RegularFile, error) {
-	p := f.fullpath + string(os.PathSeparator) + name
+	p := pathJoin(f.fullpath, name)
 
 	fh, err := os.OpenFile(p, os.O_RDWR|os.O_CREATE, perms(exec))
 	if err != nil {
@@ -108,7 +122,7 @@ func (f osFile) CreateChildFile(name string, exec bool) (RegularFile, error) {
 }
 
 func (f osFile) CreateChildDir(name string) (Dir, error) {
-	p := f.fullpath + string(os.PathSeparator) + name
+	p := pathJoin(f.fullpath, name)
 
 	if err := os.Mkdir(p, perms(true)); err != nil {
 		return nil, err
@@ -118,7 +132,7 @@ func (f osFile) CreateChildDir(name string) (Dir, error) {
 }
 
 func (f osFile) CreateChildSymlink(name string, target string) (Symlink, error) {
-	p := f.fullpath + string(os.PathSeparator) + name
+	p := pathJoin(f.fullpath, name)
 
 	err := os.Symlink(target, p)
 	if err != nil {
@@ -128,6 +142,10 @@ func (f osFile) CreateChildSymlink(name string, target string) (Symlink, error)
 	return openOSFile(p)
 }
 
+func (f osFile) RenameChild(oldname, newname string) error {
+	return os.Rename(pathJoin(f.fullpath, oldname), pathJoin(f.fullpath, newname))
+}
+
 func (f osFile) Readlink() (string, error) {
 	return os.Readlink(f.fullpath)
 }