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143 lines
3.3 KiB
Go
143 lines
3.3 KiB
Go
//go:build linux
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// +build linux
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package xattr
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import (
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"os"
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"syscall"
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"golang.org/x/sys/unix"
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)
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const (
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// XATTR_SUPPORTED will be true if the current platform is supported
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XATTR_SUPPORTED = true
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XATTR_CREATE = unix.XATTR_CREATE
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XATTR_REPLACE = unix.XATTR_REPLACE
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// ENOATTR is not exported by the syscall package on Linux, because it is
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// an alias for ENODATA. We export it here so it is available on all
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// our supported platforms.
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ENOATTR = syscall.ENODATA
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)
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// On Linux, FUSE and CIFS filesystems can return EINTR for interrupted system
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// calls. This function works around this by retrying system calls until they
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// stop returning EINTR.
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//
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// See https://github.com/golang/go/commit/6b420169d798c7ebe733487b56ea5c3fa4aab5ce.
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func ignoringEINTR(fn func() error) (err error) {
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for {
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err = fn()
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if err != unix.EINTR {
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break
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}
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}
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return err
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}
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func getxattr(path string, name string, data []byte) (int, error) {
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var r int
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err := ignoringEINTR(func() (err error) {
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r, err = unix.Getxattr(path, name, data)
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return err
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})
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return r, err
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}
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func lgetxattr(path string, name string, data []byte) (int, error) {
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var r int
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err := ignoringEINTR(func() (err error) {
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r, err = unix.Lgetxattr(path, name, data)
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return err
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})
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return r, err
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}
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func fgetxattr(f *os.File, name string, data []byte) (int, error) {
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var r int
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err := ignoringEINTR(func() (err error) {
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r, err = unix.Fgetxattr(int(f.Fd()), name, data)
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return err
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})
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return r, err
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}
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func setxattr(path string, name string, data []byte, flags int) error {
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return ignoringEINTR(func() (err error) {
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return unix.Setxattr(path, name, data, flags)
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})
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}
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func lsetxattr(path string, name string, data []byte, flags int) error {
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return ignoringEINTR(func() (err error) {
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return unix.Lsetxattr(path, name, data, flags)
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})
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}
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func fsetxattr(f *os.File, name string, data []byte, flags int) error {
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return ignoringEINTR(func() (err error) {
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return unix.Fsetxattr(int(f.Fd()), name, data, flags)
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})
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}
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func removexattr(path string, name string) error {
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return ignoringEINTR(func() (err error) {
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return unix.Removexattr(path, name)
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})
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}
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func lremovexattr(path string, name string) error {
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return ignoringEINTR(func() (err error) {
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return unix.Lremovexattr(path, name)
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})
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}
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func fremovexattr(f *os.File, name string) error {
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return ignoringEINTR(func() (err error) {
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return unix.Fremovexattr(int(f.Fd()), name)
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})
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}
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func listxattr(path string, data []byte) (int, error) {
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var r int
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err := ignoringEINTR(func() (err error) {
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r, err = unix.Listxattr(path, data)
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return err
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})
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return r, err
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}
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func llistxattr(path string, data []byte) (int, error) {
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var r int
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err := ignoringEINTR(func() (err error) {
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r, err = unix.Llistxattr(path, data)
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return err
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})
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return r, err
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}
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func flistxattr(f *os.File, data []byte) (int, error) {
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var r int
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err := ignoringEINTR(func() (err error) {
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r, err = unix.Flistxattr(int(f.Fd()), data)
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return err
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})
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return r, err
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}
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// stringsFromByteSlice converts a sequence of attributes to a []string.
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// On Darwin and Linux, each entry is a NULL-terminated string.
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func stringsFromByteSlice(buf []byte) (result []string) {
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offset := 0
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for index, b := range buf {
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if b == 0 {
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result = append(result, string(buf[offset:index]))
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offset = index + 1
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}
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}
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return
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}
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