osutil

Documentation

Overview

Package osutil implements utilities for native OS support.

Index

• Variables
• func Copy(from, to string) (err error)
• func DiskFreeBytes(path string) (free int64, err error)
• func DiskFreePercentage(path string) (freePct float64, err error)
• func ExpandTilde(path string) (string, error)
• func GetFilesystemRoots() ([]string, error)
• func GetLans() ([]*net.IPNet, error)
• func GetLatencyForURL(addr string) (time.Duration, error)
• func Glob(pattern string) (matches []string, err error)
• func HideConsole()
• func HideFile(path string) error
• func InWritableDir(fn func(string) error, path string) error
• func IsWindowsExecutable(path string) bool
• func Lstat(name string) (fi os.FileInfo, err error)
• func MaximizeOpenFileLimit() (int, error)
• func MkdirAll(path string, perm os.FileMode) error
• func NativeFilename(s string) string
• func NormalizedFilename(s string) string
• func Rename(from, to string) error
• func ShowFile(path string) error
• func TCPPing(address string) (time.Duration, error)
• func TryRename(from, to string) error
• type AtomicWriter
  • func CreateAtomic(path string, mode os.FileMode) (*AtomicWriter, error)
  • func (w *AtomicWriter) Close() error
  • func (w *AtomicWriter) Write(bs []byte) (int, error)
• type ReplacingWriter
  • func (w ReplacingWriter) Write(bs []byte) (int, error)

Variables

var (
	ErrClosed  = errors.New("write to closed writer")
	TempPrefix = ".syncthing.tmp."
)

var ErrNoHome = errors.New("No home directory found - set $HOME (or the platform equivalent).")

Functions

func Copy

func Copy(from, to string) (err error)

Copy copies the file content from source to destination. Tries hard to succeed on various systems by temporarily tweaking directory permissions and removing the destination file when necessary.

func DiskFreeBytes

func DiskFreeBytes(path string) (free int64, err error)

func DiskFreePercentage

func DiskFreePercentage(path string) (freePct float64, err error)

func ExpandTilde

func ExpandTilde(path string) (string, error)

func GetFilesystemRoots

func GetFilesystemRoots() ([]string, error)

func GetLans

func GetLans() ([]*net.IPNet, error)

func GetLatencyForURL

func GetLatencyForURL(addr string) (time.Duration, error)

GetLatencyForURL parses the given URL, tries opening a TCP connection to it and returns the time it took to establish the connection.

func Glob

func Glob(pattern string) (matches []string, err error)

func HideConsole

func HideConsole()

func HideFile

func HideFile(path string) error

func InWritableDir

func InWritableDir(fn func(string) error, path string) error

InWritableDir calls fn(path), while making sure that the directory containing `path` is writable for the duration of the call.

func IsWindowsExecutable

func IsWindowsExecutable(path string) bool

IsWindowsExecutable returns true if the given path has an extension that is in the list of executable extensions.

func Lstat

func Lstat(name string) (fi os.FileInfo, err error)

Lstat is like os.Lstat, except lobotomized for Android. See https://forum.syncthing.net/t/2395

func MaximizeOpenFileLimit

func MaximizeOpenFileLimit() (int, error)

MaximizeOpenFileLimit tries to set the resource limit RLIMIT_NOFILE (number of open file descriptors) to the max (hard limit), if the current (soft limit) is below the max. Returns the new (though possibly unchanged) limit, or an error if it could not be changed.

func MkdirAll

func MkdirAll(path string, perm os.FileMode) error

func NativeFilename

func NativeFilename(s string) string

func NormalizedFilename

func NormalizedFilename(s string) string

func Rename

func Rename(from, to string) error

Rename moves a temporary file to it's final place. Will make sure to delete the from file if the operation fails, so use only for situations like committing a temp file to it's final location. Tries hard to succeed on various systems by temporarily tweaking directory permissions and removing the destination file when necessary.

func ShowFile

func ShowFile(path string) error

func TCPPing

func TCPPing(address string) (time.Duration, error)

TCPPing returns the duration required to establish a TCP connection to the given host. ICMP packets require root privileges, hence why we use tcp.

func TryRename

func TryRename(from, to string) error

TryRename renames a file, leaving source file intact in case of failure. Tries hard to succeed on various systems by temporarily tweaking directory permissions and removing the destination file when necessary.

Types

type AtomicWriter

type AtomicWriter struct {
	// contains filtered or unexported fields
}

An AtomicWriter is an *os.File that writes to a temporary file in the same directory as the final path. On successful Close the file is renamed to it's final path. Any error on Write or during Close is accumulated and returned on Close, so a lazy user can ignore errors until Close.

func CreateAtomic

func CreateAtomic(path string, mode os.FileMode) (*AtomicWriter, error)

CreateAtomic is like os.Create with a FileMode, except a temporary file name is used instead of the given name.

func (*AtomicWriter) Close

func (w *AtomicWriter) Close() error

Close closes the temporary file and renames it to the final path. It is invalid to call Write() or Close() after Close().

func (*AtomicWriter) Write

func (w *AtomicWriter) Write(bs []byte) (int, error)

Write is like io.Writer, but is a no-op on an already failed AtomicWriter.

type ReplacingWriter

type ReplacingWriter struct {
	Writer io.Writer
	From   byte
	To     []byte
}

func (ReplacingWriter) Write

func (w ReplacingWriter) Write(bs []byte) (int, error)