132 lines
4.1 KiB
Go
132 lines
4.1 KiB
Go
package sysfs
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import (
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"io/fs"
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"os"
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experimentalsys "github.com/tetratelabs/wazero/experimental/sys"
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"github.com/tetratelabs/wazero/internal/platform"
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"github.com/tetratelabs/wazero/sys"
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)
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func DirFS(dir string) experimentalsys.FS {
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return &dirFS{
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dir: dir,
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cleanedDir: ensureTrailingPathSeparator(dir),
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}
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}
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func ensureTrailingPathSeparator(dir string) string {
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if !os.IsPathSeparator(dir[len(dir)-1]) {
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return dir + string(os.PathSeparator)
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}
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return dir
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}
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// dirFS is not exported because the input fields must be maintained together.
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// This is likely why os.DirFS doesn't, either!
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type dirFS struct {
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experimentalsys.UnimplementedFS
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dir string
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// cleanedDir is for easier OS-specific concatenation, as it always has
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// a trailing path separator.
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cleanedDir string
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}
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// String implements fmt.Stringer
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func (d *dirFS) String() string {
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return d.dir
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}
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// OpenFile implements the same method as documented on sys.FS
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func (d *dirFS) OpenFile(path string, flag experimentalsys.Oflag, perm fs.FileMode) (experimentalsys.File, experimentalsys.Errno) {
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return OpenOSFile(d.join(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 (d *dirFS) Lstat(path string) (sys.Stat_t, experimentalsys.Errno) {
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return lstat(d.join(path))
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}
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// Stat implements the same method as documented on sys.FS
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func (d *dirFS) Stat(path string) (sys.Stat_t, experimentalsys.Errno) {
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return stat(d.join(path))
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}
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// Mkdir implements the same method as documented on sys.FS
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func (d *dirFS) Mkdir(path string, perm fs.FileMode) (errno experimentalsys.Errno) {
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err := os.Mkdir(d.join(path), perm)
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if errno = experimentalsys.UnwrapOSError(err); errno == experimentalsys.ENOTDIR {
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errno = experimentalsys.ENOENT
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}
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return
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}
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// Chmod implements the same method as documented on sys.FS
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func (d *dirFS) Chmod(path string, perm fs.FileMode) experimentalsys.Errno {
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err := os.Chmod(d.join(path), perm)
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return experimentalsys.UnwrapOSError(err)
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}
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// Rename implements the same method as documented on sys.FS
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func (d *dirFS) Rename(from, to string) experimentalsys.Errno {
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from, to = d.join(from), d.join(to)
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return rename(from, to)
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}
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// Readlink implements the same method as documented on sys.FS
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func (d *dirFS) Readlink(path string) (string, experimentalsys.Errno) {
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// Note: do not use syscall.Readlink as that causes race on Windows.
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// In any case, syscall.Readlink does almost the same logic as os.Readlink.
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dst, err := os.Readlink(d.join(path))
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if err != nil {
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return "", experimentalsys.UnwrapOSError(err)
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}
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return platform.ToPosixPath(dst), 0
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}
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// Link implements the same method as documented on sys.FS
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func (d *dirFS) Link(oldName, newName string) experimentalsys.Errno {
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err := os.Link(d.join(oldName), d.join(newName))
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return experimentalsys.UnwrapOSError(err)
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}
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// Rmdir implements the same method as documented on sys.FS
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func (d *dirFS) Rmdir(path string) experimentalsys.Errno {
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return rmdir(d.join(path))
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}
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// Unlink implements the same method as documented on sys.FS
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func (d *dirFS) Unlink(path string) (err experimentalsys.Errno) {
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return unlink(d.join(path))
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}
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// Symlink implements the same method as documented on sys.FS
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func (d *dirFS) Symlink(oldName, link string) experimentalsys.Errno {
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// Note: do not resolve `oldName` relative to this dirFS. The link result is always resolved
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// when dereference the `link` on its usage (e.g. readlink, read, etc).
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// https://github.com/bytecodealliance/cap-std/blob/v1.0.4/cap-std/src/fs/dir.rs#L404-L409
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err := os.Symlink(oldName, d.join(link))
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return experimentalsys.UnwrapOSError(err)
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}
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// Utimens implements the same method as documented on sys.FS
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func (d *dirFS) Utimens(path string, atim, mtim int64) experimentalsys.Errno {
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return utimens(d.join(path), atim, mtim)
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}
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func (d *dirFS) join(path string) string {
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switch path {
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case "", ".", "/":
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if d.cleanedDir == "/" {
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return "/"
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}
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// cleanedDir includes an unnecessary delimiter for the root path.
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return d.cleanedDir[:len(d.cleanedDir)-1]
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}
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// TODO: Enforce similar to safefilepath.FromFS(path), but be careful as
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// relative path inputs are allowed. e.g. dir or path == ../
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return d.cleanedDir + path
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}
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