From 0162392a28b75ccb6c3b26c26f2a83b5973a2d92 Mon Sep 17 00:00:00 2001
From: Sebastian Lackner
Date: Wed, 29 Nov 2017 12:54:34 +0100
Subject: fusefrontend: Use Fchmodat to implement Chmod

---
 internal/syscallcompat/sys_darwin.go | 17 +++++++++++++++++
 internal/syscallcompat/sys_linux.go  |  5 +++++
 2 files changed, 22 insertions(+)

(limited to 'internal/syscallcompat')

diff --git a/internal/syscallcompat/sys_darwin.go b/internal/syscallcompat/sys_darwin.go
index 527598b..367f67d 100644
--- a/internal/syscallcompat/sys_darwin.go
+++ b/internal/syscallcompat/sys_darwin.go
@@ -137,6 +137,23 @@ func Dup3(oldfd int, newfd int, flags int) (err error) {
 	return syscall.Dup2(oldfd, newfd)
 }
 
+// Poor man's Fchmodat.
+func Fchmodat(dirfd int, path string, mode uint32, flags int) (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.Chmod(path, mode)
+}
+
 // Poor man's Fchownat.
 func Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error) {
 	chdirMutex.Lock()
diff --git a/internal/syscallcompat/sys_linux.go b/internal/syscallcompat/sys_linux.go
index 0e9d6ac..4fe44fd 100644
--- a/internal/syscallcompat/sys_linux.go
+++ b/internal/syscallcompat/sys_linux.go
@@ -80,6 +80,11 @@ func Dup3(oldfd int, newfd int, flags int) (err error) {
 	return syscall.Dup3(oldfd, newfd, flags)
 }
 
+// Fchmodat syscall.
+func Fchmodat(dirfd int, path string, mode uint32, flags int) (err error) {
+	return syscall.Fchmodat(dirfd, path, mode, flags)
+}
+
 // Fchownat syscall.
 func Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error) {
 	return syscall.Fchownat(dirfd, path, uid, gid, flags)
-- 
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