Sanitize snapshots (#1002)

* sanitize snapshots

* [autofix.ci] apply automated fixes

* check for empty repo root

* normalize slashes

* normalize slashes

* try to fix windows snapshots with windows paths

* handle multiple slashes

* handle multiple slashes

* changed strategy for removing double slashes

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

tests/cli_test.go

@@ -16,6 +16,7 @@ import (
 
 	"github.com/charmbracelet/lipgloss"
 	"github.com/creack/pty"
+	"github.com/go-git/go-git/v5"
 	"github.com/hexops/gotextdiff"
 	"github.com/hexops/gotextdiff/myers"
 	"github.com/hexops/gotextdiff/span"
@@ -26,9 +27,11 @@ import (
 )
 
 // Command-line flag for regenerating snapshots
-var regenerateSnapshots = flag.Bool("regenerate-snapshots", false, "Regenerate all golden snapshots")
-var startingDir string
-var snapshotBaseDir string
+var (
+	regenerateSnapshots = flag.Bool("regenerate-snapshots", false, "Regenerate all golden snapshots")
+	startingDir         string
+	snapshotBaseDir     string
+)
 
 // Define styles using lipgloss
 var (
@@ -172,7 +175,78 @@ func (pm *PathManager) Apply() error {
 
 // Determine if running in a CI environment
 func isCIEnvironment() bool {
-	return os.Getenv("CI") != ""
+	// Check for common CI environment variables
+	// Note, that the CI variable has many possible truthy values, so we check for any non-empty value that is not "false".
+	return (os.Getenv("CI") != "" && os.Getenv("CI") != "false") || os.Getenv("GITHUB_ACTIONS") == "true"
+}
+
+// collapseExtraSlashes replaces multiple consecutive slashes with a single slash.
+func collapseExtraSlashes(s string) string {
+	return regexp.MustCompile("/+").ReplaceAllString(s, "/")
+}
+
+// sanitizeOutput replaces occurrences of the repository's absolute path in the output
+// with the placeholder "/absolute/path/to/repo". It first normalizes both the repository root
+// and the output to use forward slashes, ensuring that the replacement works reliably.
+// An error is returned if the repository root cannot be determined.
+// Convert something like:
+//
+//	D:\\a\atmos\atmos\examples\demo-stacks\stacks\deploy\**\*
+//	   --> /absolute/path/to/repo/examples/demo-stacks/stacks/deploy/**/*
+//	/home/runner/work/atmos/atmos/examples/demo-stacks/stacks/deploy/**/*
+//	   --> /absolute/path/to/repo/examples/demo-stacks/stacks/deploy/**/*
+func sanitizeOutput(output string) (string, error) {
+	// 1. Get the repository root.
+	repoRoot, err := findGitRepoRoot(startingDir)
+	if err != nil {
+		return "", err
+	}
+
+	if repoRoot == "" {
+		return "", errors.New("failed to determine repository root")
+	}
+
+	// 2. Normalize the repository root:
+	//    - Clean the path (which may not collapse all extra slashes after the drive letter, etc.)
+	//    - Convert to forward slashes,
+	//    - And explicitly collapse extra slashes.
+	normalizedRepoRoot := collapseExtraSlashes(filepath.ToSlash(filepath.Clean(repoRoot)))
+	// Also normalize the output to use forward slashes.
+	normalizedOutput := filepath.ToSlash(output)
+
+	// 3. Build a regex that matches the repository root even if extra slashes appear.
+	//    First, escape any regex metacharacters in the normalized repository root.
+	quoted := regexp.QuoteMeta(normalizedRepoRoot)
+	// Replace each literal "/" with the regex token "/+" so that e.g. "a/b/c" becomes "a/+b/+c".
+	patternBody := strings.ReplaceAll(quoted, "/", "/+")
+	// Allow for extra trailing slashes.
+	pattern := patternBody + "/*"
+	repoRootRegex, err := regexp.Compile(pattern)
+	if err != nil {
+		return "", err
+	}
+
+	// 4. Replace any occurrence of the repository root (with extra slashes) with a fixed placeholder.
+	//    The placeholder will end with exactly one slash.
+	placeholder := "/absolute/path/to/repo/"
+	replaced := repoRootRegex.ReplaceAllString(normalizedOutput, placeholder)
+
+	// 5. Now collapse extra slashes in the remainder of file paths that start with the placeholder.
+	//    We use a regex to find segments that start with the placeholder followed by some path characters.
+	//    (We assume that file paths appear in quotes or other delimited contexts, and that URLs won't match.)
+	fixRegex := regexp.MustCompile(`(/absolute/path/to/repo)([^",]+)`)
+	result := fixRegex.ReplaceAllStringFunc(replaced, func(match string) string {
+		// The regex has two groups: group 1 is the placeholder, group 2 is the remainder.
+		groups := fixRegex.FindStringSubmatch(match)
+		if len(groups) < 3 {
+			return match
+		}
+		// Collapse extra slashes in the remainder.
+		fixedRemainder := collapseExtraSlashes(groups[2])
+		return groups[1] + fixedRemainder
+	})
+
+	return result, nil
 }
 
 // sanitizeTestName converts t.Name() into a valid filename.
@@ -561,11 +635,11 @@ func verifyFileContains(t *testing.T, filePatterns map[string][]MatchPattern) bo
 }
 
 func updateSnapshot(fullPath, output string) {
-	err := os.MkdirAll(filepath.Dir(fullPath), 0755) // Ensure parent directories exist
+	err := os.MkdirAll(filepath.Dir(fullPath), 0o755) // Ensure parent directories exist
 	if err != nil {
 		panic(fmt.Sprintf("Failed to create snapshot directory: %v", err))
 	}
-	err = os.WriteFile(fullPath, []byte(output), 0644) // Write snapshot
+	err = os.WriteFile(fullPath, []byte(output), 0o644) // Write snapshot
 	if err != nil {
 		panic(fmt.Sprintf("Failed to write snapshot file: %v", err))
 	}
@@ -645,6 +719,17 @@ func verifySnapshot(t *testing.T, tc TestCase, stdoutOutput, stderrOutput string
 		return true
 	}
 
+	// Sanitize outputs and fail the test if sanitization fails.
+	var err error
+	stdoutOutput, err = sanitizeOutput(stdoutOutput)
+	if err != nil {
+		t.Fatalf("failed to sanitize stdout output: %v", err)
+	}
+	stderrOutput, err = sanitizeOutput(stderrOutput)
+	if err != nil {
+		t.Fatalf("failed to sanitize stderr output: %v", err)
+	}
+
 	testName := sanitizeTestName(t.Name())
 	stdoutFileName := fmt.Sprintf("%s.stdout.golden", testName)
 	stderrFileName := fmt.Sprintf("%s.stderr.golden", testName)
@@ -675,7 +760,6 @@ $ go test -run=%q -regenerate-snapshots`, stdoutPath, t.Name())
 		if isCIEnvironment() || !term.IsTerminal(int(os.Stdout.Fd())) {
 			// Generate a colorized diff for better readability
 			diff = generateUnifiedDiff(filteredStdoutActual, filteredStdoutExpected)
-
 		} else {
 			diff = colorizeDiffWithThreshold(filteredStdoutActual, filteredStdoutExpected, 10)
 		}
@@ -706,6 +790,29 @@ $ go test -run=%q -regenerate-snapshots`, stderrPath, t.Name())
 	return true
 }
 
+// findGitRepo finds the Git repository root
+func findGitRepoRoot(path string) (string, error) {
+	// Open the Git repository starting from the given path
+	repo, err := git.PlainOpenWithOptions(path, &git.PlainOpenOptions{DetectDotGit: true})
+	if err != nil {
+		return "", fmt.Errorf("failed to find git repository: %w", err)
+	}
+
+	// Get the repository's working tree
+	worktree, err := repo.Worktree()
+	if err != nil {
+		return "", fmt.Errorf("failed to get worktree: %w", err)
+	}
+
+	// Return the absolute path to the root of the working tree
+	root, err := filepath.Abs(worktree.Filesystem.Root())
+	if err != nil {
+		return "", fmt.Errorf("failed to get absolute path of repository root: %w", err)
+	}
+
+	return root, nil
+}
+
 func TestUnmarshalMatchPattern(t *testing.T) {
 	yamlData := `
 expect:

tests/test-cases/demo-stacks.yaml

@@ -96,12 +96,7 @@ tests:
       - "-f"
       - "yaml"
     expect:
-      diff:
-        - "stacksBaseAbsolutePath"
-        - "terraformDirAbsolutePath"
-        - "helmfileDirAbsolutePath"
-        - 'examples[/\\]+demo-stacks[/\\]+stacks[/\\]+\*\*[/\\]+_defaults.yaml'
-        - 'examples[/\\]+demo-stacks[/\\]+stacks[/\\]deploy[/\\]+\*\*[/\\]+\*'
+      diff: []
       stdout:
         - 'append_user_agent: Atmos/(\d+\.\d+\.\d+|test) \(Cloud Posse; \+https:\/\/atmos\.tools\)'
       stderr:
@@ -120,11 +115,6 @@ tests:
     expect:
       diff:
         - '"append_user_agent": "Atmos/(\d+\.\d+\.\d+|test) \(Cloud Posse; \+https:\/\/atmos\.tools\)"'
-        - "stacksBaseAbsolutePath"
-        - "terraformDirAbsolutePath"
-        - "helmfileDirAbsolutePath"
-        - 'examples[/\\]+demo-stacks[/\\]+stacks[/\\]+\*\*[/\\]+_defaults.yaml'
-        - 'examples[/\\]+demo-stacks[/\\]+stacks[/\\]+deploy[/\\]+\*\*[/\\]+\*'
       stdout:
         - '"append_user_agent": "Atmos/(\d+\.\d+\.\d+|test) \(Cloud Posse; \+https:\/\/atmos\.tools\)"'
       stderr: