Test "fix exportReferencesGraph when given store subpath"

[roberth]

• Test Fix exportReferencesGraph when given store subpath #10549

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[ShamrockLee]

I'm still inspecting how it works, but paths returned from lib.getExe seem to reproduce this issue reliably.

Here is a single-line reproducer based on Nixpkgs:
nix-build --no-out-link -E "let lib = import ./lib; pkgs = import ./. { }; path = lib.getExe pkgs.hello; in pkgs.runCommandLocal ''reference-graph-structured'' { __structuredAttrs = true; nativeBuildInputs = [ pkgs.buildPackages.jq ]; exportReferencesGraph.graph = [ path ]; } ''jq . \$NIX_ATTRS_JSON_FILE | tee \$out''"

Here is the initial discussion: NixOS/nixpkgs#316652 (comment)