38 lines
1.6 KiB
Text
38 lines
1.6 KiB
Text
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# Nix with sandboxing requires every path used at build time be
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# explicitly declared. If we simply passed in the paths, they
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# would be copied in as sources. Using builtins.storePath we're
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# able to tell Nix that, no, in fact, treat these not as sources
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# to copy, but instead of a regular store path.
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#
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# Include the explicit closure, too, otherwise we'll get mysterious
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# "file not found" errors due to the glibc interpreter being
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# missing.
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let
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# Magic inspired by Nix's config.nix:
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# https://github.com/NixOS/nix/blob/f9a2ea44867cd1dbb408bca4df0ced806137b7f7/corepkgs/config.nix.in#L23
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#
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# If the dependency is in the Nix store we're using, refer to
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# it as a literal store path. If it isn't, refer to it "normally".
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#
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# This makes sandboxing happy when in a nix-build, and the
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# evaluation happy when in a «cargo build».
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tools_build_host = @tools_build_host@;
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# Compare the stringified version of the tools_build_host Nix store
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# path to the evaluator's stringified Nix store path. Otherwise,
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# Nix will read the sources in to the /nix/store, and, well,
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# you can only copy the /nix/store in to the /nix/store so many
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# times before you run out of disk space.
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dep = if ("${toString (dirOf tools_build_host)}" == "${toString builtins.storeDir}")
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then (builtins.trace "using storePath" builtins.storePath)
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else (builtins.trace "using toString" toString) # assume we have no sandboxing
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;
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tools = dep tools_build_host;
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in {
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path = "${tools}/bin";
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builder = "${tools}/bin/bash";
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closure = import @runtime_closure_list@ { inherit dep; };
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}
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