1 files changed, 132 insertions, 0 deletions
diff --git a/vendor/go4.org/wkfs/wkfs.go b/vendor/go4.org/wkfs/wkfs.go
new file mode 100644
index 0000000..f4df062
--- /dev/null
+++ b/vendor/go4.org/wkfs/wkfs.go
@@ -0,0 +1,132 @@
+/*
+Copyright 2014 The Camlistore Authors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Package wkfs implements the pluggable "well-known filesystem" abstraction layer.
+//
+// Instead of accessing files directly through the operating system
+// using os.Open or os.Stat, code should use wkfs.Open or wkfs.Stat,
+// which first try to intercept paths at well-known top-level
+// directories representing previously-registered mount types,
+// otherwise fall through to the operating system paths.
+//
+// Example of top-level well-known directories that might be
+// registered include /gcs/bucket/object for Google Cloud Storage or
+// /s3/bucket/object for AWS S3.
+package wkfs // import "go4.org/wkfs"
+
+import (
+	"io"
+	"io/ioutil"
+	"os"
+	"strings"
+)
+
+type File interface {
+	io.Reader
+	io.ReaderAt
+	io.Closer
+	io.Seeker
+	Name() string
+	Stat() (os.FileInfo, error)
+}
+
+type FileWriter interface {
+	io.Writer
+	io.Closer
+}
+
+func Open(name string) (File, error)               { return fs(name).Open(name) }
+func Stat(name string) (os.FileInfo, error)        { return fs(name).Stat(name) }
+func Lstat(name string) (os.FileInfo, error)       { return fs(name).Lstat(name) }
+func MkdirAll(path string, perm os.FileMode) error { return fs(path).MkdirAll(path, perm) }
+func OpenFile(name string, flag int, perm os.FileMode) (FileWriter, error) {
+	return fs(name).OpenFile(name, flag, perm)
+}
+func Create(name string) (FileWriter, error) {
+	// like os.Create but WRONLY instead of RDWR because we don't
+	// expose a Reader here.
+	return OpenFile(name, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0666)
+}
+
+func fs(name string) FileSystem {
+	for pfx, fs := range wkFS {
+		if strings.HasPrefix(name, pfx) {
+			return fs
+		}
+	}
+	return osFS{}
+}
+
+type osFS struct{}
+
+func (osFS) Open(name string) (File, error)               { return os.Open(name) }
+func (osFS) Stat(name string) (os.FileInfo, error)        { return os.Stat(name) }
+func (osFS) Lstat(name string) (os.FileInfo, error)       { return os.Lstat(name) }
+func (osFS) MkdirAll(path string, perm os.FileMode) error { return os.MkdirAll(path, perm) }
+func (osFS) OpenFile(name string, flag int, perm os.FileMode) (FileWriter, error) {
+	return os.OpenFile(name, flag, perm)
+}
+
+type FileSystem interface {
+	Open(name string) (File, error)
+	OpenFile(name string, flag int, perm os.FileMode) (FileWriter, error)
+	Stat(name string) (os.FileInfo, error)
+	Lstat(name string) (os.FileInfo, error)
+	MkdirAll(path string, perm os.FileMode) error
+}
+
+// well-known filesystems
+var wkFS = map[string]FileSystem{}
+
+// RegisterFS registers a well-known filesystem. It intercepts
+// anything beginning with prefix (which must start and end with a
+// forward slash) and forwards it to fs.
+func RegisterFS(prefix string, fs FileSystem) {
+	if !strings.HasPrefix(prefix, "/") || !strings.HasSuffix(prefix, "/") {
+		panic("bogus prefix: " + prefix)
+	}
+	if _, dup := wkFS[prefix]; dup {
+		panic("duplication registration of " + prefix)
+	}
+	wkFS[prefix] = fs
+}
+
+// WriteFile writes data to a file named by filename.
+// If the file does not exist, WriteFile creates it with permissions perm;
+// otherwise WriteFile truncates it before writing.
+func WriteFile(filename string, data []byte, perm os.FileMode) error {
+	f, err := OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, perm)
+	if err != nil {
+		return err
+	}
+	n, err := f.Write(data)
+	if err == nil && n < len(data) {
+		err = io.ErrShortWrite
+	}
+	if err1 := f.Close(); err == nil {
+		err = err1
+	}
+	return err
+}
+
+func ReadFile(filename string) ([]byte, error) {
+	f, err := Open(filename)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+	return ioutil.ReadAll(f)
+}