Treat junctions as symlinks

Author: jakebailey

internal/vfs/symlink.go

@@ -13,6 +13,8 @@ import (
 	"syscall"
 )
 
+// This is a copy of filepath.EvalSymlinks, but treats junctions as symlinks, matching pre-Go 1.23 behavior.
+
 func volumeNameLen(path string) int {
 	return len(filepath.VolumeName(path))
 }
@@ -91,7 +93,7 @@ func walkSymlinks(path string) (string, error) {
 			return "", err
 		}
 
-		if fi.Mode()&fs.ModeSymlink == 0 {
+		if fi.Mode()&fs.ModeSymlink == 0 && !isJunction(fi) {
 			if !fi.Mode().IsDir() && end < len(path) {
 				return "", syscall.ENOTDIR
 			}

internal/vfs/symlink_other.go

@@ -0,0 +1,9 @@
+//go:build !windows
+
+package vfs
+
+import "os"
+
+func isJunction(fi os.FileInfo) bool {
+	return false
+}

internal/vfs/symlink_windows.go

@@ -0,0 +1,11 @@
+package vfs
+
+import (
+	"os"
+	"syscall"
+)
+
+func isJunction(fi os.FileInfo) bool {
+	sys := fi.Sys().(*syscall.Win32FileAttributeData)
+	return sys.FileAttributes&syscall.FILE_ATTRIBUTE_REPARSE_POINT != 0 && sys.FileAttributes&syscall.FILE_ATTRIBUTE_DIRECTORY != 0
+}