diff options
Diffstat (limited to 'vendor/github.com/go-git/go-billy/v5/osfs/os_plan9.go')
-rw-r--r-- | vendor/github.com/go-git/go-billy/v5/osfs/os_plan9.go | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/vendor/github.com/go-git/go-billy/v5/osfs/os_plan9.go b/vendor/github.com/go-git/go-billy/v5/osfs/os_plan9.go new file mode 100644 index 000000000..fe1eb85df --- /dev/null +++ b/vendor/github.com/go-git/go-billy/v5/osfs/os_plan9.go @@ -0,0 +1,83 @@ +package osfs + +import ( + "io" + "os" + "path/filepath" + "syscall" +) + +func (f *file) Lock() error { + // Plan 9 uses a mode bit instead of explicit lock/unlock syscalls. + // + // Per http://man.cat-v.org/plan_9/5/stat: “Exclusive use files may be open + // for I/O by only one fid at a time across all clients of the server. If a + // second open is attempted, it draws an error.” + // + // There is no obvious way to implement this function using the exclusive use bit. + // See https://golang.org/src/cmd/go/internal/lockedfile/lockedfile_plan9.go + // for how file locking is done by the go tool on Plan 9. + return nil +} + +func (f *file) Unlock() error { + return nil +} + +func rename(from, to string) error { + // If from and to are in different directories, copy the file + // since Plan 9 does not support cross-directory rename. + if filepath.Dir(from) != filepath.Dir(to) { + fi, err := os.Stat(from) + if err != nil { + return &os.LinkError{"rename", from, to, err} + } + if fi.Mode().IsDir() { + return &os.LinkError{"rename", from, to, syscall.EISDIR} + } + fromFile, err := os.Open(from) + if err != nil { + return &os.LinkError{"rename", from, to, err} + } + toFile, err := os.OpenFile(to, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, fi.Mode()) + if err != nil { + return &os.LinkError{"rename", from, to, err} + } + _, err = io.Copy(toFile, fromFile) + if err != nil { + return &os.LinkError{"rename", from, to, err} + } + + // Copy mtime and mode from original file. + // We need only one syscall if we avoid os.Chmod and os.Chtimes. + dir := fi.Sys().(*syscall.Dir) + var d syscall.Dir + d.Null() + d.Mtime = dir.Mtime + d.Mode = dir.Mode + if err = dirwstat(to, &d); err != nil { + return &os.LinkError{"rename", from, to, err} + } + + // Remove original file. + err = os.Remove(from) + if err != nil { + return &os.LinkError{"rename", from, to, err} + } + return nil + } + return os.Rename(from, to) +} + +func dirwstat(name string, d *syscall.Dir) error { + var buf [syscall.STATFIXLEN]byte + + n, err := d.Marshal(buf[:]) + if err != nil { + return &os.PathError{"dirwstat", name, err} + } + if err = syscall.Wstat(name, buf[:n]); err != nil { + return &os.PathError{"dirwstat", name, err} + } + return nil +} |