Clean up unused code (#1502)

## Changes
1. Removes `DefaultMutatorsForTarget` which is no longer used anywhere
2. Makes SnapshotPath a private field. It's no longer needed by data
structures outside its package.

FYI, I also tried finding other instances of dead code but I could not
find anything else that was safe to remove. I used
https://go.dev/blog/deadcode to search for them, and the other instances
either implemented an interface, increased test coverage for some of our
other code paths or there was some other reason I could not remove them
(like autogenerated functions or used in tests).

Good sign our codebase is mostly clean (at least superficially).

bundle/config/mutator/mutator.go

@@ -26,10 +26,3 @@ func DefaultMutators() []bundle.Mutator {
 		LoadGitDetails(),
 	}
 }
-
-func DefaultMutatorsForTarget(target string) []bundle.Mutator {
-	return append(
-		DefaultMutators(),
-		SelectTarget(target),
-	)
-}

libs/sync/snapshot.go

@@ -35,7 +35,7 @@ const LatestSnapshotVersion = "v1"
 type Snapshot struct {
 	// Path where this snapshot was loaded from and will be saved to.
 	// Intentionally not part of the snapshot state because it may be moved by the user.
-	SnapshotPath string `json:"-"`
+	snapshotPath string
 
 	// New indicates if this is a fresh snapshot or if it was loaded from disk.
 	New bool `json:"-"`
@@ -70,7 +70,7 @@ func NewSnapshot(localFiles []fileset.File, opts *SyncOptions) (*Snapshot, error
 	snapshotState.ResetLastModifiedTimes()
 
 	return &Snapshot{
-		SnapshotPath:  snapshotPath,
+		snapshotPath:  snapshotPath,
 		New:           true,
 		Version:       LatestSnapshotVersion,
 		Host:          opts.Host,
@@ -107,7 +107,7 @@ func newSnapshot(ctx context.Context, opts *SyncOptions) (*Snapshot, error) {
 	}
 
 	return &Snapshot{
-		SnapshotPath: path,
+		snapshotPath: path,
 		New:          true,
 
 		Version:    LatestSnapshotVersion,
@@ -122,7 +122,7 @@ func newSnapshot(ctx context.Context, opts *SyncOptions) (*Snapshot, error) {
 }
 
 func (s *Snapshot) Save(ctx context.Context) error {
-	f, err := os.OpenFile(s.SnapshotPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
+	f, err := os.OpenFile(s.snapshotPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
 	if err != nil {
 		return fmt.Errorf("failed to create/open persisted sync snapshot file: %s", err)
 	}
@@ -147,11 +147,11 @@ func loadOrNewSnapshot(ctx context.Context, opts *SyncOptions) (*Snapshot, error
 	}
 
 	// Snapshot file not found. We return the new copy.
-	if _, err := os.Stat(snapshot.SnapshotPath); errors.Is(err, fs.ErrNotExist) {
+	if _, err := os.Stat(snapshot.snapshotPath); errors.Is(err, fs.ErrNotExist) {
 		return snapshot, nil
 	}
 
-	bytes, err := os.ReadFile(snapshot.SnapshotPath)
+	bytes, err := os.ReadFile(snapshot.snapshotPath)
 	if err != nil {
 		return nil, fmt.Errorf("failed to read sync snapshot from disk: %s", err)
 	}
@@ -191,7 +191,7 @@ func (s *Snapshot) diff(ctx context.Context, all []fileset.File) (diff, error) {
 
 	currentState := s.SnapshotState
 	if err := currentState.validate(); err != nil {
-		return diff{}, fmt.Errorf("error parsing existing sync state. Please delete your existing sync snapshot file (%s) and retry: %w", s.SnapshotPath, err)
+		return diff{}, fmt.Errorf("error parsing existing sync state. Please delete your existing sync snapshot file (%s) and retry: %w", s.snapshotPath, err)
 	}
 
 	// Compute diff to apply to get from current state to new target state.

libs/sync/sync.go

@@ -223,10 +223,6 @@ func (s *Sync) GetFileList(ctx context.Context) ([]fileset.File, error) {
 	return all.Iter(), nil
 }
 
-func (s *Sync) SnapshotPath() string {
-	return s.snapshot.SnapshotPath
-}
-
 func (s *Sync) RunContinuous(ctx context.Context) error {
 	ticker := time.NewTicker(s.PollInterval)
 	defer ticker.Stop()