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moby--moby/pkg/system/xattrs_linux.go

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package system
import "golang.org/x/sys/unix"
// Lgetxattr retrieves the value of the extended attribute identified by attr
// and associated with the given path in the file system.
// It will returns a nil slice and nil error if the xattr is not set.
func Lgetxattr(path string, attr string) ([]byte, error) {
dest := make([]byte, 128)
sz, errno := unix.Lgetxattr(path, attr, dest)
if errno == unix.ENODATA {
return nil, nil
}
if errno == unix.ERANGE {
dest = make([]byte, sz)
sz, errno = unix.Lgetxattr(path, attr, dest)
}
if errno != nil {
return nil, errno
}
return dest[:sz], nil
}
// Lsetxattr sets the value of the extended attribute identified by attr
// and associated with the given path in the file system.
func Lsetxattr(path string, attr string, data []byte, flags int) error {
return unix.Lsetxattr(path, attr, data, flags)
}