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package sysfs
import (
"fmt"
"io/fs"
"path"
experimentalsys "github.com/tetratelabs/wazero/experimental/sys"
"github.com/tetratelabs/wazero/sys"
)
type AdaptFS struct {
FS fs.FS
}
// String implements fmt.Stringer
func (a *AdaptFS) String() string {
return fmt.Sprintf("%v", a.FS)
}
// OpenFile implements the same method as documented on sys.FS
func (a *AdaptFS) OpenFile(path string, flag experimentalsys.Oflag, perm fs.FileMode) (experimentalsys.File, experimentalsys.Errno) {
return OpenFSFile(a.FS, cleanPath(path), flag, perm)
}
// Lstat implements the same method as documented on sys.FS
func (a *AdaptFS) Lstat(path string) (sys.Stat_t, experimentalsys.Errno) {
// At this time, we make the assumption sys.FS instances do not support
// symbolic links, therefore Lstat is the same as Stat. This is obviously
// not true, but until FS.FS has a solid story for how to handle symlinks,
// we are better off not making a decision that would be difficult to
// revert later on.
//
// For further discussions on the topic, see:
// https://github.com/golang/go/issues/49580
return a.Stat(path)
}
// Stat implements the same method as documented on sys.FS
func (a *AdaptFS) Stat(path string) (sys.Stat_t, experimentalsys.Errno) {
f, errno := a.OpenFile(path, experimentalsys.O_RDONLY, 0)
if errno != 0 {
return sys.Stat_t{}, errno
}
defer f.Close()
return f.Stat()
}
// Readlink implements the same method as documented on sys.FS
func (a *AdaptFS) Readlink(string) (string, experimentalsys.Errno) {
return "", experimentalsys.ENOSYS
}
// Mkdir implements the same method as documented on sys.FS
func (a *AdaptFS) Mkdir(string, fs.FileMode) experimentalsys.Errno {
return experimentalsys.ENOSYS
}
// Chmod implements the same method as documented on sys.FS
func (a *AdaptFS) Chmod(string, fs.FileMode) experimentalsys.Errno {
return experimentalsys.ENOSYS
}
// Rename implements the same method as documented on sys.FS
func (a *AdaptFS) Rename(string, string) experimentalsys.Errno {
return experimentalsys.ENOSYS
}
// Rmdir implements the same method as documented on sys.FS
func (a *AdaptFS) Rmdir(string) experimentalsys.Errno {
return experimentalsys.ENOSYS
}
// Link implements the same method as documented on sys.FS
func (a *AdaptFS) Link(string, string) experimentalsys.Errno {
return experimentalsys.ENOSYS
}
// Symlink implements the same method as documented on sys.FS
func (a *AdaptFS) Symlink(string, string) experimentalsys.Errno {
return experimentalsys.ENOSYS
}
// Unlink implements the same method as documented on sys.FS
func (a *AdaptFS) Unlink(string) experimentalsys.Errno {
return experimentalsys.ENOSYS
}
// Utimens implements the same method as documented on sys.FS
func (a *AdaptFS) Utimens(string, int64, int64) experimentalsys.Errno {
return experimentalsys.ENOSYS
}
func cleanPath(name string) string {
if len(name) == 0 {
return name
}
// fs.ValidFile cannot be rooted (start with '/')
cleaned := name
if name[0] == '/' {
cleaned = name[1:]
}
cleaned = path.Clean(cleaned) // e.g. "sub/." -> "sub"
return cleaned
}
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