From 1dc85e5fcaec5c7c8a5dbb5a914935bb84b2fd6a Mon Sep 17 00:00:00 2001
From: Herlon Aguiar <herlon214@gmail.com>
Date: Wed, 8 Dec 2021 21:26:55 +0100
Subject: [PATCH] lib/file: check if path has nounc while checking max path for
 windows

---
 lib/file/file_windows.go  | 5 +++--
 lib/file/mkdir_windows.go | 5 +++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/lib/file/file_windows.go b/lib/file/file_windows.go
index f617c28e7..c2ba100f4 100644
--- a/lib/file/file_windows.go
+++ b/lib/file/file_windows.go
@@ -8,6 +8,7 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
+	"strings"
 	"syscall"
 
 	"golang.org/x/sys/windows/registry"
@@ -34,8 +35,8 @@ func OpenFile(path string, mode int, perm os.FileMode) (*os.File, error) {
 	// For windows the max path length is 260 characters
 	// if the LongPathsEnabled is not set
 	// https://docs.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation
-	if !IsLongPathsEnabled() && len(path) >= 260 {
-		return nil, &os.PathError{Path: path, Op: "open", Err: errors.New("path length higher than 260")}
+	if !strings.HasPrefix(path, `\\?\`) && !IsLongPathsEnabled() && len(path) >= 260 {
+		return nil, &os.PathError{Path: path, Op: "open", Err: errors.New("path length 260 or higher")}
 	}
 
 	pathp, err := syscall.UTF16PtrFromString(path)
diff --git a/lib/file/mkdir_windows.go b/lib/file/mkdir_windows.go
index 0ef6c16d4..0e338e790 100644
--- a/lib/file/mkdir_windows.go
+++ b/lib/file/mkdir_windows.go
@@ -7,6 +7,7 @@ import (
 	"errors"
 	"os"
 	"path/filepath"
+	"strings"
 	"syscall"
 )
 
@@ -21,8 +22,8 @@ func MkdirAll(path string, perm os.FileMode) error {
 	// For windows the max path length is 260 characters
 	// if the LongPathsEnabled is not set
 	// https://docs.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation
-	if !IsLongPathsEnabled() && len(path) >= 260 {
-		return &os.PathError{Path: path, Op: "open", Err: errors.New("path length higher than 260")}
+	if !strings.HasPrefix(path, `\\?\`) && !IsLongPathsEnabled() && len(path) >= 260 {
+		return &os.PathError{Path: path, Op: "open", Err: errors.New("path length 260 or higher")}
 	}
 
 	// Fast path: if we can tell whether path is a directory or file, stop with success or error.