syscallcompat: Drop Fchmodat emulation on macOS.

On macOS the function has a flags argument, so we don't need the
/proc/self/fd trick used on Linux.

1 files changed, 0 insertions, 31 deletions

diff --git a/internal/syscallcompat/emulate.go b/internal/syscallcompat/emulate.go
index 360c0ac..8a538fb 100644
--- a/internal/syscallcompat/emulate.go
+++ b/internal/syscallcompat/emulate.go
@@ -1,7 +1,6 @@
 package syscallcompat
 
 import (
-	"os"
 	"path/filepath"
 	"sync"
 	"syscall"
@@ -31,36 +30,6 @@ func emulateMknodat(dirfd int, path string, mode uint32, dev int) error {
 	return syscall.Mknod(path, mode, dev)
 }
 
-// emulateFchmodat emulates the syscall for platforms that don't have it
-// in the kernel (darwin).
-func emulateFchmodat(dirfd int, path string, mode uint32, flags int) (err error) {
-	if !filepath.IsAbs(path) {
-		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)
-	}
-	// We also don't have Lchmod, so emulate it (poorly).
-	if flags&unix.AT_SYMLINK_NOFOLLOW != 0 {
-		fi, err := os.Lstat(path)
-		if err != nil {
-			return err
-		}
-		if fi.Mode()&os.ModeSymlink != 0 {
-			return nil
-		}
-	}
-	return syscall.Chmod(path, mode)
-}
-
 // emulateFchownat emulates the syscall for platforms that don't have it
 // in the kernel (darwin).
 func emulateFchownat(dirfd int, path string, uid int, gid int, flags int) (err error) {