+++ /dev/null
-// Copyright 2020 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package cache
-
-import (
- "bytes"
- "fmt"
- "os"
- "path/filepath"
- "strings"
- "syscall"
- "unsafe"
-)
-
-func init() {
- checkPathCase = darwinCheckPathCase
-}
-
-func darwinCheckPathCase(path string) error {
- // Darwin provides fcntl(F_GETPATH) to get a path for an arbitrary FD.
- // Conveniently for our purposes, it gives the canonical case back. But
- // there's no guarantee that it will follow the same route through the
- // filesystem that the original path did.
-
- path, err := filepath.Abs(path)
- if err != nil {
- return err
- }
- fd, err := syscall.Open(path, os.O_RDONLY, 0)
- if err != nil {
- return err
- }
- defer syscall.Close(fd)
- buf := make([]byte, 4096) // No MAXPATHLEN in syscall, I think it's 1024, this is bigger.
-
- // Wheeee! syscall doesn't expose a way to call Fcntl except FcntlFlock.
- // As of writing, it just passes the pointer through, so we can just lie.
- if err := syscall.FcntlFlock(uintptr(fd), syscall.F_GETPATH, (*syscall.Flock_t)(unsafe.Pointer(&buf[0]))); err != nil {
- return err
- }
- buf = buf[:bytes.IndexByte(buf, 0)]
-
- isRoot := func(p string) bool {
- return p[len(p)-1] == filepath.Separator
- }
- // Darwin seems to like having multiple names for the same folder. Match as much of the suffix as we can.
- for got, want := path, string(buf); !isRoot(got) && !isRoot(want); got, want = filepath.Dir(got), filepath.Dir(want) {
- g, w := filepath.Base(got), filepath.Base(want)
- if !strings.EqualFold(g, w) {
- break
- }
- if g != w {
- return fmt.Errorf("case mismatch in path %q: component %q should be %q", path, g, w)
- }
- }
- return nil
-}