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https://github.com/golang/go
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2d9ba733ec
The options can be modified without the view being recreated, so we need a mutex there. Change-Id: I87e881835622a941fce98e4a1062aa41acd84fcb Reviewed-on: https://go-review.googlesource.com/c/tools/+/227022 Reviewed-by: Ian Cottrell <iancottrell@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Run-TryBot: Rebecca Stambler <rstambler@golang.org>
60 lines
1.7 KiB
Go
60 lines
1.7 KiB
Go
// Copyright 2020 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package cache
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import (
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"bytes"
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"fmt"
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"os"
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"path/filepath"
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"strings"
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"syscall"
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"unsafe"
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)
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func init() {
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checkPathCase = darwinCheckPathCase
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}
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func darwinCheckPathCase(path string) error {
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// Darwin provides fcntl(F_GETPATH) to get a path for an arbitrary FD.
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// Conveniently for our purposes, it gives the canonical case back. But
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// there's no guarantee that it will follow the same route through the
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// filesystem that the original path did.
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path, err := filepath.Abs(path)
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if err != nil {
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return err
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}
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fd, err := syscall.Open(path, os.O_RDONLY, 0)
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if err != nil {
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return err
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}
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defer syscall.Close(fd)
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buf := make([]byte, 4096) // No MAXPATHLEN in syscall, I think it's 1024, this is bigger.
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// Wheeee! syscall doesn't expose a way to call Fcntl except FcntlFlock.
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// As of writing, it just passes the pointer through, so we can just lie.
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if err := syscall.FcntlFlock(uintptr(fd), syscall.F_GETPATH, (*syscall.Flock_t)(unsafe.Pointer(&buf[0]))); err != nil {
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return err
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}
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buf = buf[:bytes.IndexByte(buf, 0)]
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isRoot := func(p string) bool {
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return p[len(p)-1] == filepath.Separator
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}
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// Darwin seems to like having multiple names for the same folder. Match as much of the suffix as we can.
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for got, want := path, string(buf); !isRoot(got) && !isRoot(want); got, want = filepath.Dir(got), filepath.Dir(want) {
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g, w := filepath.Base(got), filepath.Base(want)
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if !strings.EqualFold(g, w) {
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break
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}
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if g != w {
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return fmt.Errorf("case mismatch in path %q: component %q should be %q", path, g, w)
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}
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}
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return nil
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}
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