insert-license tries to add license to the file specified as --license-filepath

[maruel]

Repro

$ cat .github/LICENSE
Copyright 2024 Marc-Antoine Ruel. All rights reserved.
Use of this source code is governed under the Apache License, Version 2.0
that can be found in the LICENSE file.

$ cat .pre-commit-config.yaml
# Copyright 2024 Marc-Antoine Ruel. All rights reserved. 
# Use of this source code is governed under the Apache License, Version 2.0 
# that can be found in the LICENSE file. 
 
repos: 
- repo: https://github.com/Lucas-C/pre-commit-hooks 
  rev: v1.5.5 
  hooks: 
  - id: insert-license 
    name: "Insert license header in C++ source files" 
    args: ["--license-filepath=.github/LICENSE"] 

Expected

Hook insert-license doesn't touch the file specified as --license-filepath

Actual

Hook insert-license inserts the license (duplicate) to the file specified as --license-filepath, breaking the license check.

$ pre-commit
Insert license header in C++ source files................................Failed
- hook id: insert-license
- exit code: 1
- files were modified by this hook

Some sources were modified by the hook ['.github/LICENSE']
Now aborting the commit.
You should check the changes made. Then simply "git add --update ." and re-commit

$ git diff
diff --git .github/LICENSE .github/LICENSE
index cb92896..ba4255b 100644
--- .github/LICENSE
+++ .github/LICENSE
@@ -1,3 +1,7 @@
+# Copyright 2024 Marc-Antoine Ruel. All rights reserved.
+# Use of this source code is governed under the Apache License, Version 2.0
+# that can be found in the LICENSE file.
+
 Copyright 2024 Marc-Antoine Ruel. All rights reserved.
 Use of this source code is governed under the Apache License, Version 2.0
 that can be found in the LICENSE file.

[maruel]

Workaround:

rm .git/hooks/pre-commit
git commit -a -m "Add license check"
pre-commit install