fix: Directory hidden files in write_source_file.

[jgiles]

Copy and manage hidden files starting with "." in write_source_files.

Previously these files were not supported if they were in the top level of the directory to copy.

Refs: #667

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Changes are visible to end-users: yes/no

• Searched for relevant documentation and updated as needed: yes
• Breaking change (forces users to change their own code or config): no
• Suggested release notes appear below: no

Test plan

• Manual testing: Used this lib version to copy a directory of generated files that included hidden files.

[CLAassistant]

All committers have signed the CLA.

[kormide]

Thanks! Can you add a test?

[jgiles]

Hey @kormide, I took a stab at adding a test, let me know if that's the right structure.

I also adjusted some of the commands - chmod and cp, without -f, were issuing an error when one of the glob patterns didn't resolve any files (so, if you had a directory with only hidden or only non-hidden files rather than mixed). The updated commands avoid that.

[kormide]

LGTM. Thanks for fixing this old issue! I'll wait for the CI run to pass before clicking approve.