Giant blob of minor changes

[dotfiles/.git] / .config / coc / extensions / coc-go-data / tools / pkg / mod / golang.org / x / tools@v0.0.0-20201105173854-bc9fc8d8c4bc / internal / lsp / cache / os_darwin.go

diff --git a/.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.0.0-20201105173854-bc9fc8d8c4bc/internal/lsp/cache/os_darwin.go b/.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.0.0-20201105173854-bc9fc8d8c4bc/internal/lsp/cache/os_darwin.go
new file mode 100644 (file)
index 0000000..73c26fd
--- /dev/null
+++ b/.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.0.0-20201105173854-bc9fc8d8c4bc/internal/lsp/cache/os_darwin.go
@@ -0,0 +1,59 @@
+// 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
+}