From bab0697f0e8a98cfa28c7527ee616e954c7afe91 Mon Sep 17 00:00:00 2001
From: Laria Carolin Chabowski <laria@laria.me>
Date: Tue, 8 Aug 2017 08:05:52 +0200
Subject: Add OpenWritable to fs interfaces

---
 backup/backup_test.go |  6 +++---
 backup/restore.go     | 12 +++++++-----
 fs/fs.go              |  3 ++-
 fs/memory.go          |  6 +++++-
 fs/os.go              | 10 +++++++++-
 5 files changed, 26 insertions(+), 11 deletions(-)

diff --git a/backup/backup_test.go b/backup/backup_test.go
index 67fbb6a..da14117 100644
--- a/backup/backup_test.go
+++ b/backup/backup_test.go
@@ -49,13 +49,13 @@ func mkfile(t *testing.T, d fs.Dir, name string, exec bool, content []byte) {
 		t.Fatalf("Could not create file %s: %s", name, err)
 	}
 
-	rwc, err := f.Open()
+	wc, err := f.OpenWritable()
 	if err != nil {
 		t.Fatalf("Could not create file %s: %s", name, err)
 	}
-	defer rwc.Close()
+	defer wc.Close()
 
-	if _, err := rwc.Write(content); err != nil {
+	if _, err := wc.Write(content); err != nil {
 		t.Fatalf("Could not create file %s: %s", name, err)
 	}
 }
diff --git a/backup/restore.go b/backup/restore.go
index 6a03200..3a384a9 100644
--- a/backup/restore.go
+++ b/backup/restore.go
@@ -7,6 +7,7 @@ import (
 	"code.laria.me/petrific/storage"
 	"fmt"
 	"io"
+	"math/rand"
 	"os"
 )
 
@@ -48,21 +49,22 @@ func RestoreDir(s storage.Storage, id objects.ObjectId, root fs.Dir) error {
 	for name, file_info := range tree {
 		switch file_info.Type() {
 		case objects.TETFile:
-			tmpname := fmt.Sprintf(".petrific-%d-%s", os.Getpid(), id)
+			tmpname := fmt.Sprintf(".petrific-%d-%08x%08x%08x%08x", os.Getpid(), rand.Uint32(), rand.Uint32(), rand.Uint32(), rand.Uint32())
 			new_file, err := root.CreateChildFile(tmpname, execBitFromACL(file_info.ACL()))
 			if err != nil {
 				return err
 			}
-			rwc, err := new_file.Open()
+
+			wc, err := new_file.OpenWritable()
 			if err != nil {
 				return err
 			}
 
-			if err := RestoreFile(s, file_info.(objects.TreeEntryFile).Ref, rwc); err != nil {
-				rwc.Close()
+			if err := RestoreFile(s, file_info.(objects.TreeEntryFile).Ref, wc); err != nil {
+				wc.Close()
 				return err
 			}
-			rwc.Close()
+			wc.Close()
 
 			if err := root.RenameChild(tmpname, name); err != nil {
 				return err
diff --git a/fs/fs.go b/fs/fs.go
index b06ded8..d6d0618 100644
--- a/fs/fs.go
+++ b/fs/fs.go
@@ -23,7 +23,8 @@ type File interface {
 
 type RegularFile interface {
 	File
-	Open() (io.ReadWriteCloser, error)
+	Open() (io.ReadCloser, error)
+	OpenWritable() (io.WriteCloser, error)
 }
 
 type Dir interface {
diff --git a/fs/memory.go b/fs/memory.go
index 221ff36..2bc11dc 100644
--- a/fs/memory.go
+++ b/fs/memory.go
@@ -40,7 +40,11 @@ type memfsFile struct {
 
 func (memfsFile) Type() FileType { return FFile }
 
-func (f memfsFile) Open() (io.ReadWriteCloser, error) {
+func (f memfsFile) Open() (io.ReadCloser, error) {
+	return f, nil
+}
+
+func (f memfsFile) OpenWritable() (io.WriteCloser, error) {
 	return f, nil
 }
 
diff --git a/fs/os.go b/fs/os.go
index f41d111..166cf92 100644
--- a/fs/os.go
+++ b/fs/os.go
@@ -58,7 +58,7 @@ func (f osFile) Delete() error {
 	return os.RemoveAll(f.fullpath)
 }
 
-func (f osFile) Open() (io.ReadWriteCloser, error) {
+func (f osFile) Open() (io.ReadCloser, error) {
 	fh, err := os.Open(f.fullpath)
 	if err != nil {
 		return nil, err
@@ -66,6 +66,14 @@ func (f osFile) Open() (io.ReadWriteCloser, error) {
 	return fh, nil
 }
 
+func (f osFile) OpenWritable() (io.WriteCloser, error) {
+	fh, err := os.Create(f.fullpath)
+	if err != nil {
+		return nil, err
+	}
+	return fh, nil
+}
+
 func (f osFile) Readdir() (list []File, err error) {
 	fh, err := os.Open(f.fullpath)
 	if err != nil {
-- 
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