From 1e692d6117a36506cd4be8df138887215530876b Mon Sep 17 00:00:00 2001
From: Xe <me@christine.website>
Date: Sun, 27 Feb 2022 18:37:44 +0000
Subject: [PATCH] commit for the blog

Signed-off-by: Xe <me@christine.website>
---
 flake.lock                    | 17 ++++++++++++++
 flake.nix                     | 43 +++++++++++++++++++++++++++++++----
 main.go                       |  3 ++-
 systemd/web-server.service.in |  9 ++++++++
 4 files changed, 66 insertions(+), 6 deletions(-)
 create mode 100644 systemd/web-server.service.in

diff --git a/flake.lock b/flake.lock
index 7062b5d..44b476c 100644
--- a/flake.lock
+++ b/flake.lock
@@ -15,9 +15,26 @@
         "type": "indirect"
       }
     },
+    "portable-svc": {
+      "locked": {
+        "lastModified": 1645960986,
+        "narHash": "sha256-XuapDz2dkUAgKaj3L2EUgzXApn6IXGtQVg/TEfhr0w8=",
+        "ref": "main",
+        "rev": "138c25c1c3ee4f7945059e05259d3fe03678e843",
+        "revCount": 5,
+        "type": "git",
+        "url": "https://tulpa.dev/cadey/portable-svc.git"
+      },
+      "original": {
+        "ref": "main",
+        "type": "git",
+        "url": "https://tulpa.dev/cadey/portable-svc.git"
+      }
+    },
     "root": {
       "inputs": {
         "nixpkgs": "nixpkgs",
+        "portable-svc": "portable-svc",
         "utils": "utils"
       }
     },
diff --git a/flake.nix b/flake.nix
index 23f5358..3001154 100644
--- a/flake.nix
+++ b/flake.nix
@@ -4,9 +4,10 @@
   inputs = {
     nixpkgs.url = "nixpkgs/nixos-unstable";
     utils.url = "github:numtide/flake-utils";
+    portable-svc.url = "git+https://tulpa.dev/cadey/portable-svc.git?ref=main";
   };
 
-  outputs = { self, nixpkgs, utils }:
+  outputs = { self, nixpkgs, utils, portable-svc }:
     utils.lib.eachSystem [
       "x86_64-linux"
       "aarch64-linux"
@@ -14,11 +15,14 @@
       "aarch64-darwin"
     ] (system:
       let
-        pkgs = nixpkgs.legacyPackages.${system};
+        pkgs = import nixpkgs {
+          overlays = [ portable-svc.overlay ];
+          inherit system;
+        };
         version = builtins.substring 0 8 self.lastModifiedDate;
       in {
         defaultPackage = pkgs.buildGoModule {
-          pname = "go-hello";
+          pname = "web-server";
           inherit version;
           src = ./.;
 
@@ -34,9 +38,38 @@
           vendorSha256 = "sha256-pQpattmS9VmO3ZIQUFn66az8GSmB4IvYhTTCFn6SUmo=";
         };
 
-        packages = {};
+        packages = {
+          docker = let
+            web = self.defaultPackage.${system};
+          in pkgs.dockerTools.buildLayeredImage {
+            name = web.pname;
+            tag = web.version;
+            contents = [ web ];
 
-        defaultApp = self.defaultPackage.${system};
+            config = {
+              Cmd = [ "/bin/web-server" ];
+              WorkingDir = "/";
+            };
+          };
+
+          web-service = pkgs.substituteAll {
+            name = "web-server.service";
+            src = ./systemd/web-server.service.in;
+            web = self.defaultPackage.${system};
+          };
+          portable = let
+            web = self.defaultPackage.${system};
+          in pkgs.portableService {
+            inherit (web) version;
+            name = web.pname;
+            description = "A web server";
+            units = [ self.packages.${system}.web-service ];
+          };
+        };
+
+        defaultApp = utils.lib.mkApp {
+          drv = self.defaultPackage.${system};
+        };
 
         devShell = pkgs.mkShell {
           buildInputs = with pkgs; [ go gopls goimports go-tools ];
diff --git a/main.go b/main.go
index 0f942a1..3121b88 100644
--- a/main.go
+++ b/main.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"log"
 	"net/http"
+	"os"
 )
 
 var (
@@ -15,7 +16,7 @@ func main() {
 	flag.Parse()
 
 	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
-		fmt.Fprintln(w, "hello from nix!")
+		fmt.Fprintf(w, "PORTABLE=%s\n", os.Getenv("PORTABLE"))
 	})
 
 	log.Printf("listening for HTTP on %s", *bindhost)
diff --git a/systemd/web-server.service.in b/systemd/web-server.service.in
new file mode 100644
index 0000000..a936b87
--- /dev/null
+++ b/systemd/web-server.service.in
@@ -0,0 +1,9 @@
+[Unit]
+Description=A web service
+
+[Service]
+DynamicUser=yes
+ExecStart=@web@/bin/web-server
+
+[Install]
+WantedBy=multi-user.target
\ No newline at end of file