forked from cloudfoundry-incubator/cflocal
/
fs.go
58 lines (47 loc) · 1.09 KB
/
fs.go
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package fs
import (
"io"
"os"
"path/filepath"
)
type FS struct{}
func (f *FS) ReadFile(path string) (io.ReadCloser, int64, error) {
return f.openFile(path, os.O_RDONLY, 0)
}
func (f *FS) WriteFile(path string) (io.WriteCloser, error) {
return os.Create(path)
}
type ReadResetWriteCloser interface {
io.ReadWriteCloser
Reset() error
}
func (f *FS) OpenFile(path string) (ReadResetWriteCloser, int64, error) {
file, size, err := f.openFile(path, os.O_CREATE|os.O_RDWR, 0666)
return resetFile{file}, size, err
}
type resetFile struct {
*os.File
}
func (r resetFile) Reset() error {
if _, err := r.Seek(0, 0); err != nil {
return err
}
return r.Truncate(0)
}
func (f *FS) openFile(path string, flag int, perm os.FileMode) (*os.File, int64, error) {
file, err := os.OpenFile(path, flag, perm)
if err != nil {
return nil, 0, err
}
fileInfo, err := file.Stat()
if err != nil {
return nil, 0, err
}
return file, fileInfo.Size(), nil
}
func (f *FS) MakeDirAll(path string) error {
return os.MkdirAll(path, 0777)
}
func (f *FS) Abs(path string) (string, error) {
return filepath.Abs(path)
}