nixpkgs/pkgs/build-support/replace-secret/replace-secret.nix

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{ stdenv, lib, python3 }:
stdenv.mkDerivation {
name = "replace-secret";
buildInputs = [ python3 ];
phases = [ "installPhase" "checkPhase" ];
installPhase = ''
install -D ${./replace-secret.py} $out/bin/replace-secret
patchShebangs $out
'';
doCheck = true;
checkPhase = ''
install -m 0600 ${./test/input_file} long_test
$out/bin/replace-secret "replace this" ${./test/passwd} long_test
$out/bin/replace-secret "and this" ${./test/rsa} long_test
diff ${./test/expected_long_output} long_test
install -m 0600 ${./test/input_file} short_test
$out/bin/replace-secret "replace this" <(echo "a") short_test
$out/bin/replace-secret "and this" <(echo "b") short_test
diff ${./test/expected_short_output} short_test
'';
meta = with lib; {
platforms = platforms.all;
maintainers = with maintainers; [ talyz ];
license = licenses.mit;
description = "Replace a string in one file with a secret from a second file";
longDescription = ''
Replace a string in one file with a secret from a second file.
Since the secret is read from a file, it won't be leaked through
'/proc/<pid>/cmdline', unlike when 'sed' or 'replace' is used.
'';
};
}