From 8b1df08b8af38aa50084abe492d0aee395492ede Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher <jakobunt@gmail.com>
Date: Wed, 9 Sep 2020 11:16:29 +0200
Subject: [PATCH] syscallcompat: add Renameat2 for Darwin

---
 internal/syscallcompat/sys_darwin.go | 14 +++++++++++---
 internal/syscallcompat/sys_linux.go  |  8 ++++++++
 2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/internal/syscallcompat/sys_darwin.go b/internal/syscallcompat/sys_darwin.go
index d9e6017..90d5ed6 100644
--- a/internal/syscallcompat/sys_darwin.go
+++ b/internal/syscallcompat/sys_darwin.go
@@ -21,6 +21,9 @@ const (
 	// O_PATH is only defined on Linux
 	O_PATH = 0
 
+	// RENAME_NOREPLACE is only defined on Linux
+	RENAME_NOREPLACE = 0
+
 	// KAUTH_UID_NONE and KAUTH_GID_NONE are special values to
 	// revert permissions to the process credentials.
 	KAUTH_UID_NONE = ^uint32(0) - 100
@@ -131,12 +134,12 @@ func SymlinkatUser(oldpath string, newdirfd int, newpath string, context *fuse.C
 	return Symlinkat(oldpath, newdirfd, newpath)
 }
 
-func MkdiratUser(dirfd int, path string, mode uint32, context *fuse.Context) (err error) {
-	if context != nil {
+func MkdiratUser(dirfd int, path string, mode uint32, caller *fuse.Caller) (err error) {
+	if caller != nil {
 		runtime.LockOSThread()
 		defer runtime.UnlockOSThread()
 
-		err = pthread_setugid_np(context.Owner.Uid, context.Owner.Gid)
+		err = pthread_setugid_np(caller.Uid, caller.Gid)
 		if err != nil {
 			return err
 		}
@@ -215,3 +218,8 @@ func UtimesNanoAtNofollow(dirfd int, path string, a *time.Time, m *time.Time) (e
 func Getdents(fd int) ([]fuse.DirEntry, error) {
 	return emulateGetdents(fd)
 }
+
+// Renameat2 does not exist on Darwin, so we call Renameat and ignore the flags.
+func Renameat2(olddirfd int, oldpath string, newdirfd int, newpath string, flags uint) (err error) {
+	return unix.Renameat(olddirfd, oldpath, newdirfd, newpath)
+}
diff --git a/internal/syscallcompat/sys_linux.go b/internal/syscallcompat/sys_linux.go
index 42e9da6..6273504 100644
--- a/internal/syscallcompat/sys_linux.go
+++ b/internal/syscallcompat/sys_linux.go
@@ -27,6 +27,9 @@ const (
 
 	// O_PATH is only defined on Linux
 	O_PATH = unix.O_PATH
+
+	// RENAME_NOREPLACE is only defined on Linux
+	RENAME_NOREPLACE = unix.RENAME_NOREPLACE
 )
 
 var preallocWarn sync.Once
@@ -271,3 +274,8 @@ func UtimesNanoAtNofollow(dirfd int, path string, a *time.Time, m *time.Time) (e
 func Getdents(fd int) ([]fuse.DirEntry, error) {
 	return getdents(fd)
 }
+
+// Renameat2 does not exist on Darwin, so we have to wrap it here.
+func Renameat2(olddirfd int, oldpath string, newdirfd int, newpath string, flags uint) (err error) {
+	return unix.Renameat2(olddirfd, oldpath, newdirfd, newpath, flags)
+}