Fix/issue 4578 path normalization for unix and windows (#4614)

* Fix Windows file:// URI normalization and index path handling

* add condition to trim leading slash only incase of windows paths

* access path from URL object and identify platform using goos

* simplified path logic

* added test cases for windows powershell & bash

---------

Co-authored-by: Kashif Khan <[email protected]>

pkg/sources/git/git.go

@@ -434,9 +434,12 @@ func normalizeFileURI(uri *url.URL) (*url.URL, error) {
 		return nil, fmt.Errorf("failed to resolve absolute path for %q: %w", rawPath, err)
 	}
 
+	// Convert to forward slashes (for Windows compatibility)
+	normalizedPath := filepath.ToSlash(absPath)
+
 	normalizedURI := &url.URL{
 		Scheme: "file",
-		Path:   absPath,
+		Path:   normalizedPath,
 	}
 
 	return normalizedURI, nil
@@ -1341,7 +1344,10 @@ func PrepareRepo(ctx context.Context, uriString, clonePath string, trustLocalGit
 			if !isRepoBare(path) {
 				// Only copy index file for non-bare clones from working directory repos. This is used to see staged changes.
 				// Note: To scan **un**staged changes in the future, we'd need to set core.worktree to the original path.
-				originalIndexPath := filepath.Join(strings.TrimPrefix(normalizedURI.String(), "file://"), gitDirName, "index")
+				uriPath := normalizedURI.Path
+
+				originalIndexPath := filepath.Join(uriPath, gitDirName, "index")
+
 				clonedIndexPath := filepath.Join(path, gitDirName, "index")
 
 				indexData, err := os.ReadFile(originalIndexPath)

pkg/sources/git/git_test.go

@@ -6,6 +6,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"runtime"
 	"strings"
 	"testing"
 	"time"
@@ -861,7 +862,7 @@ func TestNormalizeFileURI(t *testing.T) {
 		{
 			name:     "absolute file URI unchanged",
 			input:    "file:///absolute/path",
-			expected: "file:///absolute/path",
+			expected: "",
 		},
 		{
 			name:     "relative file URI with current directory",
@@ -908,6 +909,15 @@ func TestNormalizeFileURI(t *testing.T) {
 
 			var expected string
 			switch tt.name {
+			case "absolute file URI unchanged":
+				// On Windows, absolute paths get drive letter prepended
+				// On Unix, they remain as-is
+				if runtime.GOOS == "windows" {
+					expectedPath, _ := filepath.Abs("/absolute/path")
+					expected = "file://" + expectedPath
+				} else {
+					expected = "file:///absolute/path"
+				}
 			case "relative file URI with current directory":
 				expected = "file://" + cwd
 			case "relative file URI with subdirectory":
@@ -920,7 +930,10 @@ func TestNormalizeFileURI(t *testing.T) {
 			default:
 				expected = tt.expected
 			}
-
+			// Normalize slashes for Windows comparison
+			if runtime.GOOS == "windows" {
+				expected = filepath.ToSlash(expected)
+			}
 			assert.Equal(t, expected, result.String())
 		})
 	}