84 lines
2.1 KiB
Go
84 lines
2.1 KiB
Go
package osfs
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import (
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"io"
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"os"
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"path/filepath"
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"syscall"
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)
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func (f *file) Lock() error {
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// Plan 9 uses a mode bit instead of explicit lock/unlock syscalls.
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//
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// Per http://man.cat-v.org/plan_9/5/stat: “Exclusive use files may be open
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// for I/O by only one fid at a time across all clients of the server. If a
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// second open is attempted, it draws an error.”
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//
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// There is no obvious way to implement this function using the exclusive use bit.
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// See https://golang.org/src/cmd/go/internal/lockedfile/lockedfile_plan9.go
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// for how file locking is done by the go tool on Plan 9.
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return nil
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}
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func (f *file) Unlock() error {
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return nil
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}
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func rename(from, to string) error {
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// If from and to are in different directories, copy the file
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// since Plan 9 does not support cross-directory rename.
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if filepath.Dir(from) != filepath.Dir(to) {
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fi, err := os.Stat(from)
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if err != nil {
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return &os.LinkError{"rename", from, to, err}
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}
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if fi.Mode().IsDir() {
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return &os.LinkError{"rename", from, to, syscall.EISDIR}
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}
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fromFile, err := os.Open(from)
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if err != nil {
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return &os.LinkError{"rename", from, to, err}
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}
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toFile, err := os.OpenFile(to, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, fi.Mode())
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if err != nil {
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return &os.LinkError{"rename", from, to, err}
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}
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_, err = io.Copy(toFile, fromFile)
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if err != nil {
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return &os.LinkError{"rename", from, to, err}
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}
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// Copy mtime and mode from original file.
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// We need only one syscall if we avoid os.Chmod and os.Chtimes.
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dir := fi.Sys().(*syscall.Dir)
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var d syscall.Dir
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d.Null()
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d.Mtime = dir.Mtime
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d.Mode = dir.Mode
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if err = dirwstat(to, &d); err != nil {
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return &os.LinkError{"rename", from, to, err}
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}
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// Remove original file.
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err = os.Remove(from)
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if err != nil {
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return &os.LinkError{"rename", from, to, err}
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}
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return nil
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}
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return os.Rename(from, to)
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}
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func dirwstat(name string, d *syscall.Dir) error {
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var buf [syscall.STATFIXLEN]byte
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n, err := d.Marshal(buf[:])
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if err != nil {
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return &os.PathError{"dirwstat", name, err}
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}
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if err = syscall.Wstat(name, buf[:n]); err != nil {
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return &os.PathError{"dirwstat", name, err}
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}
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return nil
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}
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