nix-super/scripts/installer.nix

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{ lib
, runCommand
, nix
, tarballs
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}:
runCommand "installer-script" {
buildInputs = [ nix ];
} ''
mkdir -p $out/nix-support
# Converts /nix/store/50p3qk8k...-nix-2.4pre20201102_550e11f/bin/nix to 50p3qk8k.../bin/nix.
tarballPath() {
# Remove the store prefix
local path=''${1#${builtins.storeDir}/}
# Get the path relative to the derivation root
local rest=''${path#*/}
# Get the derivation hash
local drvHash=''${path%%-*}
echo "$drvHash/$rest"
}
substitute ${./install.in} $out/install \
${lib.concatMapStrings
(tarball: let
inherit (tarball.stdenv.hostPlatform) system;
in '' \
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--replace '@tarballHash_${system}@' $(nix --experimental-features nix-command hash-file --base16 --type sha256 ${tarball}/*.tar.xz) \
--replace '@tarballPath_${system}@' $(tarballPath ${tarball}/*.tar.xz) \
''
)
tarballs
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} --replace '@nixVersion@' ${nix.version}
echo "file installer $out/install" >> $out/nix-support/hydra-build-products
''