From 614745ee576760023961fbf815985b90f90ad1d7 Mon Sep 17 00:00:00 2001
From: Sebastian Lackner
Date: Wed, 29 Nov 2017 13:21:28 +0100
Subject: fusefrontend: allow_other: close race between mkdir and chown

Fixes the same problem as described in 72b975867a3b9bdf53fc2da62e2ba4a328d7e4ab,
except for directories instead of device nodes.
---
 internal/syscallcompat/sys_darwin.go | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'internal/syscallcompat/sys_darwin.go')

diff --git a/internal/syscallcompat/sys_darwin.go b/internal/syscallcompat/sys_darwin.go
index 367f67d..39a225f 100644
--- a/internal/syscallcompat/sys_darwin.go
+++ b/internal/syscallcompat/sys_darwin.go
@@ -187,3 +187,20 @@ func Symlinkat(oldpath string, newdirfd int, newpath string) (err error) {
 	defer syscall.Fchdir(cwd)
 	return syscall.Symlink(oldpath, newpath)
 }
+
+// Poor man's Mkdirat.
+func Mkdirat(dirfd int, path string, mode uint32) (err error) {
+	chdirMutex.Lock()
+	defer chdirMutex.Unlock()
+	cwd, err := syscall.Open(".", syscall.O_RDONLY, 0)
+	if err != nil {
+		return err
+	}
+	defer syscall.Close(cwd)
+	err = syscall.Fchdir(dirfd)
+	if err != nil {
+		return err
+	}
+	defer syscall.Fchdir(cwd)
+	return syscall.Mkdir(path, mode)
+}
-- 
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