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Rewrite chuser() for simplicity and correctness #1203

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Rewrite chuser() for simplicity and correctness #1203

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Commits on Nov 4, 2024

  1. Rewrite chuser() for simplicity and correctness 

    - Use unambiguous variable names (w/o package name conflict).
- Fail on invalid input such as the empty string or `:`.
- Do not change group without user, i.e. fail on `:group`.
- Parse input using mnemonic APIs.
- Do not juggle between integer types.
- Unset supplementary groups.
- Use setres[ug]id(2) to match the idiom of OpenBSD base programs.

Includes/Supersedes yggdrasil-network#1202.
Fixes yggdrasil-network#927.

I only tested on OpenBSD (so far), hence the split, but other systems
should just work.
    @klemensn
    klemensn committed Nov 4, 2024
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