[Nix-dev] Inexplicable replaceRuntimeDependencies assertion failure

[Shea Levy]

Hi Mark,

I can't answer your specific case without seeing the details of man-db,
but are you sure you want replaceRuntimeDependencies here and not
packageOverrides? replaceRuntimeDependencies is for when you need to do
a binary patching of a whole tree while you wait for a proper rebuild to
finish, not general dependency changing.

> 2) Why does the assertion even exist?

replace-dependency.nix works by hash-rewriting: A store path is
serialized, every instance of, say,
'1cyrk96c7dfvrxa1896c4i91zmizm280-firefox-49.0.2' is replaced with, say
'9hfv8iwb1k5mnpkaliswsgs1sv7px2x2-firefox-49.0.2'. If the name (in this
example, "firefox-49.0.2") were not the same length, then the
replacement wouldn't work, because we don't know which offsets and sizes
to change in the files to correspond to that change.
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