check for syscall errors in posix-errors helper functions (#6232)

cmd/posix-errors.go

@@ -24,6 +24,9 @@ import (
 
 // Function not implemented error
 func isSysErrNoSys(err error) bool {
+	if err == syscall.ENOSYS {
+		return true
+	}
 	if pathErr, ok := err.(*os.PathError); ok {
 		switch pathErr.Err {
 		case syscall.ENOSYS:
@@ -35,6 +38,9 @@ func isSysErrNoSys(err error) bool {
 
 // Not supported error
 func isSysErrOpNotSupported(err error) bool {
+	if err == syscall.EOPNOTSUPP {
+		return true
+	}
 	if pathErr, ok := err.(*os.PathError); ok {
 		switch pathErr.Err {
 		case syscall.EOPNOTSUPP:
@@ -46,6 +52,9 @@ func isSysErrOpNotSupported(err error) bool {
 
 // No space left on device error
 func isSysErrNoSpace(err error) bool {
+	if err == syscall.ENOSPC {
+		return true
+	}
 	if pathErr, ok := err.(*os.PathError); ok {
 		switch pathErr.Err {
 		case syscall.ENOSPC:
@@ -57,6 +66,9 @@ func isSysErrNoSpace(err error) bool {
 
 // Input/output error
 func isSysErrIO(err error) bool {
+	if err == syscall.EIO {
+		return true
+	}
 	if pathErr, ok := err.(*os.PathError); ok {
 		switch pathErr.Err {
 		case syscall.EIO:
@@ -68,6 +80,9 @@ func isSysErrIO(err error) bool {
 
 // Check if the given error corresponds to EISDIR (is a directory).
 func isSysErrIsDir(err error) bool {
+	if err == syscall.EISDIR {
+		return true
+	}
 	if pathErr, ok := err.(*os.PathError); ok {
 		switch pathErr.Err {
 		case syscall.EISDIR:
@@ -79,6 +94,9 @@ func isSysErrIsDir(err error) bool {
 
 // Check if the given error corresponds to ENOTDIR (is not a directory).
 func isSysErrNotDir(err error) bool {
+	if err == syscall.ENOTDIR {
+		return true
+	}
 	if pathErr, ok := err.(*os.PathError); ok {
 		switch pathErr.Err {
 		case syscall.ENOTDIR:
@@ -90,6 +108,9 @@ func isSysErrNotDir(err error) bool {
 
 // Check if the given error corresponds to the ENAMETOOLONG (name too long).
 func isSysErrTooLong(err error) bool {
+	if err == syscall.ENAMETOOLONG {
+		return true
+	}
 	if pathErr, ok := err.(*os.PathError); ok {
 		switch pathErr.Err {
 		case syscall.ENAMETOOLONG:
@@ -102,6 +123,9 @@ func isSysErrTooLong(err error) bool {
 // Check if the given error corresponds to ENOTEMPTY for unix
 // and ERROR_DIR_NOT_EMPTY for windows (directory not empty).
 func isSysErrNotEmpty(err error) bool {
+	if err == syscall.ENOTEMPTY {
+		return true
+	}
 	if pathErr, ok := err.(*os.PathError); ok {
 		if runtime.GOOS == globalWindowsOSName {
 			if errno, _ok := pathErr.Err.(syscall.Errno); _ok && errno == 0x91 {