1 files changed, 121 insertions, 0 deletions
diff --git a/src/pkg/os/path.go b/src/pkg/os/path.go
new file mode 100644
index 000000000..0b86b8f8b
--- /dev/null
+++ b/src/pkg/os/path.go
@@ -0,0 +1,121 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package os
+
+import "os"
+
+// PathError reports an error and the file path where it occurred.
+type PathError struct {
+	Path string;
+	Error Error;
+}
+
+func (p *PathError) String() string {
+	return p.Path + ": " + p.Error.String();
+}
+
+// MkdirAll creates a directory named path,
+// along with any necessary parents, and returns nil,
+// or else returns an error.
+// The permission bits perm are used for all
+// directories that MkdirAll creates.
+// If path is already a directory, MkdirAll does nothing
+// and returns nil.
+func MkdirAll(path string, perm int) Error {
+	// If path exists, stop with success or error.
+	dir, err := os.Lstat(path);
+	if err == nil {
+		if dir.IsDirectory() {
+			return nil;
+		}
+		return &PathError{path, ENOTDIR};
+	}
+
+	// Doesn't already exist; make sure parent does.
+	i := len(path);
+	for i > 0 && path[i-1] == '/' {	// Skip trailing slashes.
+		i--;
+	}
+
+	j := i;
+	for j > 0 && path[j-1] != '/' {	// Scan backward over element.
+		j--;
+	}
+
+	if j > 0 {
+		// Create parent
+		err = MkdirAll(path[0:j-1], perm);
+		if err != nil {
+			return err;
+		}
+	}
+
+	// Now parent exists, try to create.
+	err = Mkdir(path, perm);
+	if err != nil {
+		// Handle arguments like "foo/." by
+		// double-checking that directory doesn't exist.
+		dir, err1 := os.Lstat(path);
+		if err1 == nil && dir.IsDirectory() {
+			return nil;
+		}
+		return &PathError{path, err};
+	}
+	return nil;
+}
+
+// RemoveAll removes path and any children it contains.
+// It removes everything it can but returns the first error
+// it encounters.
+func RemoveAll(path string) Error {
+	// Simple case: if Remove works, we're done.
+	err := Remove(path);
+	if err == nil {
+		return nil;
+	}
+
+	// Otherwise, is this a directory we need to recurse into?
+	dir, err1 := os.Lstat(path);
+	if err1 != nil {
+		return &PathError{path, err1};
+	}
+	if !dir.IsDirectory() {
+		// Not a directory; return the error from Remove.
+		return &PathError{path, err};
+	}
+
+	// Directory.
+	fd, err := Open(path, os.O_RDONLY, 0);
+	if err != nil {
+		return &PathError{path, err};
+	}
+	defer fd.Close();
+
+	// Remove contents & return first error.
+	err = nil;
+	for {
+		names, err1 := fd.Readdirnames(100);
+		for i, name := range names {
+			err1 := RemoveAll(path + "/" + name);
+			if err1 != nil && err == nil {
+				err = err1;
+			}
+		}
+		// If Readdirnames returned an error, use it.
+		if err1 != nil && err == nil {
+			err = &PathError{path, err1};
+		}
+		if len(names) == 0 {
+			break;
+		}
+	}
+
+	// Remove directory.
+	err1 = Remove(path);
+	if err1 != nil && err == nil {
+		err = &PathError{path, err1};
+	}
+	return err;
+}