Allow checkouts done without .git

[jnweiger]

Also documented accepted inputs to the sed monster and expected. Feel free to convert that into a unit test :-)

[update-docs[bot]]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a changelog item based on your changes.

[sonarcloud[bot]]

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[phil-davis]

@jnweiger is this something that is still wanted/needed?

[DeepDiver1975]

old aka dead -> close