6d53a0033a
This implements path_(create|remove)_directory path_unlink_file in wasi, particularly needed to use TinyGo tests to verify our interpretation of WASI. Use of this requires the experimental `writefs.DirFS`. Signed-off-by: Adrian Cole <adrian@tetrate.io>
103 lines
2.5 KiB
Go
103 lines
2.5 KiB
Go
package writefs
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import (
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"io/fs"
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"os"
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"path"
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"syscall"
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)
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// FS is a fs.FS which can also create new files or directories.
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//
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// Any unsupported method should return syscall.ENOSYS.
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//
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// See https://github.com/golang/go/issues/45757
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type FS interface {
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fs.FS
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// OpenFile is similar to os.OpenFile, except the path is relative to this
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// file system.
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OpenFile(name string, flag int, perm fs.FileMode) (fs.File, error)
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// Mkdir is similar to os.Mkdir, except the path is relative to this file
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// system.
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Mkdir(name string, perm fs.FileMode) error
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// Rmdir is similar to syscall.Rmdir, except the path is relative to this
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// file system.
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//
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// # Errors
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//
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// The following errors are expected:
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// - syscall.EINVAL: `path` is invalid.
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// - syscall.ENOENT: `path` doesn't exist.
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// - syscall.ENOTDIR: `path` exists, but isn't a directory.
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// - syscall.ENOTEMPTY: `path` exists, but isn't empty.
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//
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// # Notes
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//
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// - As of Go 1.19, Windows maps syscall.ENOTDIR to syscall.ENOENT.
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Rmdir(path string) error
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// Unlink is similar to syscall.Unlink, except the path is relative to this
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// file system.
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//
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// The following errors are expected:
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// - syscall.EINVAL: `path` is invalid.
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// - syscall.ENOENT: `path` doesn't exist.
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// - syscall.EISDIR: `path` exists, but is a directory.
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Unlink(path string) error
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}
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func DirFS(dir string) FS {
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return dirFS(dir)
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}
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type dirFS string
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// Open implements the same method as documented on fs.FS
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func (dir dirFS) Open(name string) (fs.File, error) {
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return dir.OpenFile(name, os.O_RDONLY, 0) // same as os.Open(string)
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}
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// OpenFile implements FS.OpenFile
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func (dir dirFS) OpenFile(name string, flag int, perm fs.FileMode) (fs.File, error) {
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if !fs.ValidPath(name) {
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return nil, &fs.PathError{Op: "open", Path: name, Err: fs.ErrInvalid}
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}
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return os.OpenFile(path.Join(string(dir), name), flag, perm)
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}
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// Mkdir implements FS.Mkdir
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func (dir dirFS) Mkdir(name string, perm fs.FileMode) error {
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if !fs.ValidPath(name) {
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return &fs.PathError{Op: "mkdir", Path: name, Err: fs.ErrInvalid}
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}
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err := os.Mkdir(path.Join(string(dir), name), perm)
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return adjustMkdirError(err)
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}
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// Rmdir implements FS.Rmdir
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func (dir dirFS) Rmdir(name string) error {
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if !fs.ValidPath(name) {
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return syscall.EINVAL
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}
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err := syscall.Rmdir(path.Join(string(dir), name))
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return adjustRmdirError(err)
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}
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// Unlink implements FS.Unlink
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func (dir dirFS) Unlink(name string) error {
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if !fs.ValidPath(name) {
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return syscall.EINVAL
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}
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err := syscall.Unlink(path.Join(string(dir), name))
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return adjustUnlinkError(err)
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}
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