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`filesystem.cc` is the only place where `createSymlink()` is used with three arguments:
in the definition of `replaceSymlink()` with three parameters that _is not used at all_.
Closes #8495
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Rather than directly copying the source to its dest, copy it first to a
temporary location, and eventually move that temporary.
That way, the move is at least atomic from the point-of-view of the destination
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In most places the fallback to copying isn’t needed and can actually be
bad, so we’d rather not transparently fallback
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`move` tends to have this `mv` connotation of “I will copy it for you if
needs be”
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The recursive copy from the stl doesn’t exactly do what we need because
1. It doesn’t delete things as we go
2. It doesn’t keep the mtime, which change the nars
So re-implement it ourselves. A bit dull, but that way we have what we want
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In `nix::rename`, if the call to `rename` fails with `EXDEV` (failure
because the source and the destination are in a different filesystems)
switch to copying and removing the source.
To avoid having to re-implement the copy manually, I switched the
function to use the c++17 `filesystem` library (which has a `copy`
function that should do what we want).
Fix #6262
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Directly takes some c++ strings, and gently throws an exception on error
(rather than having to inline this logic everywhere)
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Unclutter `util.cc` a bit
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