fix: skip dot-prefixed and .DS_Store sources in infect

dotool/infect.go

@@ -6,6 +6,7 @@ import (
 	"log"
 	"os"
 	"path/filepath"
+	"strings"
 	"time"
 )
 
@@ -51,6 +52,9 @@ func linkDirectory(sourceDir, homeDir string, addDot bool) error {
 	}
 
 	for _, entry := range entries {
+		if skipSource(entry.Name()) {
+			continue
+		}
 		sourcePath := filepath.Join(sourceDir, entry.Name())
 		name := entry.Name()
 		if addDot {
@@ -79,6 +83,9 @@ func linkSpecificFiles(homeDir string) error {
 		if err != nil {
 			return fmt.Errorf("failed to get relative path for %s: %w", path, err)
 		}
+		if skipSource(relativePath) {
+			return nil
+		}
 
 		targetPath := filepath.Join(homeDir, "."+relativePath)
 		if err := os.MkdirAll(filepath.Dir(targetPath), 0750); err != nil {
@@ -89,6 +96,12 @@ func linkSpecificFiles(homeDir string) error {
 	})
 }
 
+// skipSource reports whether rel, a path under link/ or specific/, must not be linked.
+// A dot-prefixed top-level name would land at ~/..name, and .DS_Store is Finder litter.
+func skipSource(rel string) bool {
+	return strings.HasPrefix(rel, ".") || filepath.Base(rel) == ".DS_Store"
+}
+
 func linkBinFiles(homeDir string) error {
 	entries, err := os.ReadDir("bin")
 	if err != nil {

dotool/infect_test.go

@@ -110,3 +110,39 @@ func TestLinkBinFiles(t *testing.T) {
 		}
 	}
 }
+
+func TestLinkSkipsDotEntries(t *testing.T) {
+	tempDir := t.TempDir()
+	t.Chdir(tempDir)
+
+	for _, file := range []string{"link/.DS_Store", "link/.zsh_favlist", "link/zshrc", "specific/.DS_Store", "specific/config/app/.DS_Store", "specific/config/app/.envrc"} {
+		if err := os.MkdirAll(filepath.Dir(file), 0750); err != nil {
+			t.Fatalf("failed to create directory for %s: %v", file, err)
+		}
+		if err := os.WriteFile(file, []byte("x"), 0600); err != nil {
+			t.Fatalf("failed to create test file %s: %v", file, err)
+		}
+	}
+
+	homeDir := filepath.Join(tempDir, "home")
+	if err := os.MkdirAll(homeDir, 0750); err != nil {
+		t.Fatalf("failed to create home directory: %v", err)
+	}
+	if err := linkDirectory("link", homeDir, true); err != nil {
+		t.Fatalf("linkDirectory() error = %v", err)
+	}
+	if err := linkSpecificFiles(homeDir); err != nil {
+		t.Fatalf("linkSpecificFiles() error = %v", err)
+	}
+
+	for _, want := range []string{".zshrc", ".config/app/.envrc"} {
+		if _, err := os.Lstat(filepath.Join(homeDir, want)); err != nil {
+			t.Errorf("expected symlink %s: %v", want, err)
+		}
+	}
+	for _, unwanted := range []string{"..DS_Store", "..zsh_favlist", ".config/app/.DS_Store"} {
+		if _, err := os.Lstat(filepath.Join(homeDir, unwanted)); err == nil {
+			t.Errorf("unexpected symlink %s", unwanted)
+		}
+	}
+}