Initial commit

Proof-of-concept implementation. Bugs will occur.

vendor/github.com/hanwen/go-fuse/v2/internal/renameat/renameat.go

@@ -0,0 +1,9 @@
+package renameat
+
+// Renameat is a wrapper around renameat syscall.
+// On Linux, it is a wrapper around renameat2(2).
+// On Darwin, it is a wrapper around renameatx_np(2).
+// On FreeBSD, it is a wrapper around renameat(2).
+func Renameat(olddirfd int, oldpath string, newdirfd int, newpath string, flags uint) (err error) {
+	return renameat(olddirfd, oldpath, newdirfd, newpath, flags)
+}

vendor/github.com/hanwen/go-fuse/v2/internal/renameat/renameat_darwin.go

@@ -0,0 +1,38 @@
+package renameat
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+const (
+	SYS_RENAMEATX_NP = 488
+	RENAME_SWAP      = 0x2
+	RENAME_EXCHANGE  = RENAME_SWAP
+)
+
+func renameat(olddirfd int, oldpath string, newdirfd int, newpath string, flags uint) error {
+	oldpathCString, err := syscall.BytePtrFromString(oldpath)
+	if err != nil {
+		return err
+	}
+	newpathCString, err := syscall.BytePtrFromString(newpath)
+	if err != nil {
+		return err
+	}
+
+	_, _, errno := syscall.Syscall6(
+		SYS_RENAMEATX_NP,
+		uintptr(olddirfd),
+		uintptr(unsafe.Pointer(oldpathCString)),
+		uintptr(newdirfd),
+		uintptr(unsafe.Pointer(newpathCString)),
+		uintptr(flags),
+		0,
+	)
+
+	if errno != 0 {
+		return errno
+	}
+	return nil
+}

vendor/github.com/hanwen/go-fuse/v2/internal/renameat/renameat_freebsd.go

@@ -0,0 +1,17 @@
+package renameat
+
+import "golang.org/x/sys/unix"
+
+const (
+	// Since FreeBSD does not currently privode renameat syscall
+	// beyond POSIX standard like Linux and Darwin do, we borrow
+	// the defination from Linux but reject these non-POSIX flags.
+	RENAME_EXCHANGE = (1 << 1)
+)
+
+func renameat(olddirfd int, oldpath string, newdirfd int, newpath string, flags uint) (err error) {
+	if flags != 0 {
+		return unix.ENOSYS
+	}
+	return unix.Renameat(olddirfd, oldpath, newdirfd, newpath)
+}

vendor/github.com/hanwen/go-fuse/v2/internal/renameat/renameat_linux.go

@@ -0,0 +1,11 @@
+package renameat
+
+import "golang.org/x/sys/unix"
+
+const (
+	RENAME_EXCHANGE = unix.RENAME_EXCHANGE
+)
+
+func renameat(olddirfd int, oldpath string, newdirfd int, newpath string, flags uint) (err error) {
+	return unix.Renameat2(olddirfd, oldpath, newdirfd, newpath, flags)
+}