Ignore exact files within the root directory

[oliikit]

What does this implement/fix? Explain your changes.

Currently, if a file is a top-level file within a repository and is added to git secret, the filename added to .gitignore will subsequently ignore all files with that name in further sub-directories.

This can cause some unintended behaviors if you are using git-secret in a mixed repository where there are both encrypted and unencrypted files as any file within sub-directories will be ignored. Adding files to both the .gitignore and .git-secret/mapping.cfg utilize git ls-files to output the filename and then prepends the path to it in subsequent functions. To fix this issue, if a file is within the root directory (i.e., the path does not contain a /), I prepended a / to the filename so that git ignore works as intended.

Does this close any currently open issues?

No

Steps to Reproduce

Current version: git-secret 0.5.0-alpha2

1. Add a file within the root directory to git-secret
   1. the file in both .gitignore and git-secret will be FILENAME
2. Commit the file
3. Add a file in a sub-directory with the same name as in step 1.
   1. Result: file will be ignored - even if was intended to be added to git

Any other comments?

While this can be fixed by editing the .gitignore whenever it causes conflict, this PR just stops the behavior from stopping it in the first place.

[joshrabinowitz]

@oliikit do these changes pass git-secret's self-tests for you?

Have not investigated but i'm seeing several test failures on multiple platforms in the auto tests in the github actions.

[oliikit]

@joshrabinowitz - I've been meaning to check out the different platform errors. Admittedly, I'm on macOS 12.6 and had passing tests locally. I'm planning on taking a look at the other failed platform tests later this week.