guix/tests/binary-patching.nix

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{ version }:
with import ./config.nix;
mkDerivation {
name = "foo-${toString version}";
builder = builtins.toFile "builder.sh"
''
mkdir $out
(for ((n = 1; n < 100000; n++)); do echo $n; done) > $out/foo
${if version != 1 then ''
(for ((n = 100000; n < 110000; n++)); do echo $n; done) >> $out/foo
'' else ""}
${if version == 3 then ''
echo foobar >> $out/foo
'' else ""}
'';
}