Create directories and files in r/w storage that are writable.

Make all tests freeze r/o storage before commencing.

unionfs/unionfs.go

@@ -278,6 +278,15 @@ func (me *UnionFs) Promote(name string, srcResult branchResult, context *fuse.Co
 
 	if srcResult.attr.IsRegular() {
 		code = fuse.CopyFile(sourceFs, writable, name, name, context)
+
+		if code.Ok() {
+			code = writable.Chmod(name, srcResult.attr.Mode & 07777 | 0200, context)
+		}
+		if code.Ok() {
+			code = writable.Utimens(name, uint64(srcResult.attr.Atime_ns),
+				uint64(srcResult.attr.Mtime_ns), context)
+		}
+
 		files := me.nodeFs.AllFiles(name, 0)
 		for _, fileWrapper := range files {
 			if !code.Ok() {
@@ -312,12 +321,13 @@ func (me *UnionFs) Promote(name string, srcResult branchResult, context *fuse.Co
 			code = writable.Symlink(link, name, context)
 		}
 	} else if srcResult.attr.IsDirectory() {
-		code = writable.Mkdir(name, 0755, context)
+		code = writable.Mkdir(name, srcResult.attr.Mode & 07777 | 0200, context)
 	} else {
 		log.Println("Unknown file type:", srcResult.attr)
 		return fuse.ENOSYS
 	}
 
+
 	if !code.Ok() {
 		me.branchCache.GetFresh(name)
 		return code
@@ -625,9 +635,9 @@ func (me *UnionFs) promoteDirsTo(filename string) fuse.Status {
 		j := len(todo) - i - 1
 		d := todo[j]
 		r := results[j]
-		code := me.fileSystems[0].Mkdir(d, r.attr.Mode&07777, nil)
+		code := me.fileSystems[0].Mkdir(d, r.attr.Mode&07777 | 0200, nil)
 		if code != fuse.OK {
-			log.Println("Error creating dir leading to path", d, code)
+			log.Println("Error creating dir leading to path", d, code, me.fileSystems[0])
 			return fuse.EPERM
 		}