install: nix examples (draft)

install/nix/mongo.nix

@@ -0,0 +1,35 @@
+{ stdenv, fetchurl, dpkg, glibc, xz, curl, openssl, gcc-unwrapped, autoPatchelfHook }:
+
+let in stdenv.mkDerivation {
+  name = "mongodb-5.0.6";
+  system = "x86_64-linux";
+  src = fetchurl {
+    url = "https://repo.mongodb.org/apt/ubuntu/dists/focal/mongodb-org/5.0/multiverse/binary-amd64/mongodb-org-server_5.0.6_amd64.deb";
+    hash = "sha256-Rk43PNQN8p2/3XDDjWOzJmzBjs39CR06kLrTtr+5ngo=";
+  };
+  nativeBuildInputs = [
+    autoPatchelfHook 
+    dpkg
+  ];
+  buildInputs = [
+    glibc
+    openssl # libcrypto.so.1.1 libssl.so.1.1
+    xz # liblzma.so.5
+    curl # libcurl.so.4
+    gcc-unwrapped
+  ];
+  unpackPhase = "true";
+  installPhase = ''
+    mkdir -p $out
+    dpkg -x $src $out
+    mkdir $out/bin
+    mv $out/usr/bin/mongod $out/bin/mongod
+  '';
+
+  meta = {
+    description = "MongoDB";
+    homepage = https://www.mongodb.com/;
+    maintainers = [ "undefined <i@undefined.moe>" ];
+    platforms = [ "x86_64-linux" ];
+  };
+}