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fs.go
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fs.go
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/*
Package fs provides a file system interface.
*/
package fs
import (
"errors"
"io"
"os"
)
var (
errAppendModeNotSupported = errors.New("append mode is not supported")
)
// File is the interface compatible with os.File.
type File interface {
io.Closer
io.Reader
io.ReaderAt
io.Seeker
io.Writer
io.WriterAt
// Stat returns os.FileInfo describing the file.
Stat() (os.FileInfo, error)
// Sync commits the current contents of the file.
Sync() error
// Truncate changes the size of the file.
Truncate(size int64) error
// Slice reads and returns the contents of file from offset start to offset end.
Slice(start int64, end int64) ([]byte, error)
}
// LockFile represents a lock file.
type LockFile interface {
// Unlock and removes the lock file.
Unlock() error
}
// FileSystem represents a file system.
type FileSystem interface {
// OpenFile opens the file with specified flag.
OpenFile(name string, flag int, perm os.FileMode) (File, error)
// Stat returns os.FileInfo describing the file.
Stat(name string) (os.FileInfo, error)
// Remove removes the file.
Remove(name string) error
// Rename renames oldpath to newpath.
Rename(oldpath, newpath string) error
// ReadDir reads the directory and returns a list of directory entries.
ReadDir(name string) ([]os.FileInfo, error)
// CreateLockFile creates a lock file.
CreateLockFile(name string, perm os.FileMode) (LockFile, bool, error)
}