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