ansible-lint fails when running outside a Git repository with --exclude

[klausenbusk]

Summary

Running ansible-lint outside a Git repository with --exclude results in a TypeError: sequence item 0: expected str instance, PosixPath found error.

Context: We are running ansible-lint in GitLab CI in a Docker image without Git installed, this causes the code-path for "running outside Git" to be run which fails when combined with --exclude (CI log).

Issue Type

• Bug Report

Ansible and Ansible Lint details

$ ansible --version
ansible [core 2.11.0] 
  config file = /etc/ansible/ansible.cfg
  configured module search path = ['/home/kristian/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python3.9/site-packages/ansible
  ansible collection location = /home/kristian/.ansible/collections:/usr/share/ansible/collections
  executable location = /usr/bin/ansible
  python version = 3.9.5 (default, May 12 2021, 17:14:51) [GCC 10.2.0]
  jinja version = 3.0.1
  libyaml = True
$ ansible-lint --version
ansible-lint 5.0.9 using ansible 2.11.0

• ansible installation method: OS package
• ansible-lint installation method: OS package

OS / ENVIRONMENT

Arch Linux

STEPS TO REPRODUCE

Run ansible-lint outside a Git repository with --exclude

Desired Behaviour

ansible-lint should do its thing and don't explode.

Actual Behaviour

$ cd /
$ ansible-lint --exclude 123
Traceback (most recent call last):
  File "/usr/bin/ansible-lint", line 33, in <module>
    sys.exit(load_entry_point('ansible-lint==5.0.9', 'console_scripts', 'ansible-lint')())
  File "/usr/lib/python3.9/site-packages/ansiblelint/__main__.py", line 283, in _run_cli_entrypoint
    sys.exit(main(sys.argv))
  File "/usr/lib/python3.9/site-packages/ansiblelint/__main__.py", line 220, in main
    result = _get_matches(rules, options)
  File "/usr/lib/python3.9/site-packages/ansiblelint/runner.py", line 184, in _get_matches
    lintables = ansiblelint.utils.get_lintables(options=options, args=options.lintables)
  File "/usr/lib/python3.9/site-packages/ansiblelint/utils.py", line 805, in get_lintables
    for filename in discover_lintables(options):
  File "/usr/lib/python3.9/site-packages/ansiblelint/file_utils.py", line 228, in discover_lintables
    exclude_pattern = "|".join(options.exclude_paths)
TypeError: sequence item 0: expected str instance, PosixPath found