Describe the interaction between input addressing and content addressing that leads to 1:many relation between output and derivations #13405
Description
Problem
- Store path metadata has the potential to get corrupted #13384 was hard to explain.
Proposal
Elaborate on my explanation for the behavior in #13384 in the manual.
- think about how this relates to floating ca outputs
- https://nix.dev/manual/nix/2.29/store/derivation/outputs/content-address.html#design-rationale almost leads us there, but doesn't go into the consequences for input addressed derivations (probably not the right place for the new content, but a "see also"-like link seems appropriate).
- depending on (1) integrate the explanation it into the currently very short page about input addressing, or somewhere else
- omit the "fresh derivation" and "override" parts, which are not relevant to the hashing machinery
- clarify with a concrete example
Checklist
- checked latest Nix manual (source)
- checked open documentation issues and pull requests for possible duplicates
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