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git/git.go (4)

205-207: Avoid TOCTOU: create the hook atomically with O_EXCL.

Between the existence check and WriteFile, another process could create the file. Use an atomic create to prevent clobbering and surface an accurate “already exists” error.

-// Write the hook file with executable permissions (0o755)
-return os.WriteFile(target, content, 0o755) //nolint:gosec
+// Write the hook file with executable permissions (0o755) atomically
+f, err := os.OpenFile(target, os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0o755) //nolint:gosec
+if err != nil {
+	if os.IsExist(err) {
+		return fmt.Errorf("hook file already exists: %s", target)
+	}
+	return err
+}
+defer f.Close()
+if _, err := f.Write(content); err != nil {
+	return err
+}
+return nil

---

197-197: Nit: standardize and clarify error messages (include path).

Clearer user-facing errors help troubleshooting.

-		return errors.New("hook file prepare-commit-msg exist")
+		return fmt.Errorf("hook file already exists: %s", target)

-		return errors.New("hook file prepare-commit-msg is not exist")
+		return fmt.Errorf("hook file does not exist: %s", target)

Also applies to: 223-223

---

218-221: UninstallHook: treat os.IsNotExist consistently with InstallHook.

Mirror the improved install behavior so a missing hook produces a friendly “does not exist” message instead of propagating a raw error.

 	exists, err := file.IsFile(target)
 	if err != nil {
-		return err
+		if os.IsNotExist(err) {
+			return fmt.Errorf("hook file does not exist: %s", target)
+		}
+		return err
 	}

---

8-8: Prefer filepath over path for OS-native paths.

path is for slash-separated paths; filepath handles OS-specific separators. Low risk, improves portability on Windows.

-import (
+import (
 	"errors"
 	"fmt"
 	"os"
 	"os/exec"
-	"path"
+	"path/filepath"
 	"strconv"
 	"strings"

-	target := path.Join(strings.TrimSpace(string(hookPath)), HookPrepareCommitMessageTemplate)
+	target := filepath.Join(strings.TrimSpace(string(hookPath)), HookPrepareCommitMessageTemplate)

-	target := path.Join(strings.TrimSpace(string(hookPath)), HookPrepareCommitMessageTemplate)
+	target := filepath.Join(strings.TrimSpace(string(hookPath)), HookPrepareCommitMessageTemplate)

Also applies to: 191-191, 217-217

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