We were seeing an error on single-user nix mode, where rename fails if the right permissions on the source path are missing. Since the paths are removed in sandbox mode anyways, we can use copyPath to work around this.
Testcase: nix-build '<nixpkgs>' -A documentation-highlighter --substituters ""
I suspect the build creates an actualPath/.. with no write bit set. Being root will ignore that completely, but single-user mode would have a problem. That suggests we can also fix this problem with a well-placed chmod.
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