34 lines
743 B
Nix
34 lines
743 B
Nix
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{
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lib,
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runCommand,
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emptyFile,
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nix-diff,
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}:
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assertion: a: b:
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let
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drvA =
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builtins.unsafeDiscardOutputDependency
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a.drvPath or (throw "testEqualDerivation second argument must be a package");
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drvB =
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builtins.unsafeDiscardOutputDependency
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b.drvPath or (throw "testEqualDerivation third argument must be a package");
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name = if a ? name then "testEqualDerivation-${a.name}" else "testEqualDerivation";
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in
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if drvA == drvB then
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emptyFile
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else
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runCommand name
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{
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inherit assertion drvA drvB;
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nativeBuildInputs = [ nix-diff ];
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}
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''
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echo "$assertion"
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echo "However, the derivations differ:"
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echo
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echo nix-diff $drvA $drvB
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nix-diff $drvA $drvB
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exit 1
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''
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