ref(build): build and deploy with nix

Refactored the build of the docker image to be done with nix: the flake
knows how to build the docker image, using caddy as a HTTP server. It
generates a small image, with the configuration for caddy and the site
generated by hugo (`nix build`).

Deleted the Dockerfile since the creation is done with nix.

Got rid of the deployment script since this is also done via the
flake (`nix run .#deploy`).

1 files changed, 52 insertions, 28 deletions

diff --git a/flake.nix b/flake.nix
index 79e6953..a752a6e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -8,39 +8,63 @@
 
   outputs = { self, nixpkgs, flake-utils }:
     flake-utils.lib.eachDefaultSystem (system:
-      let pkgs = nixpkgs.legacyPackages.${system};
-      in {
-        defaultPackage = with pkgs;
-          stdenv.mkDerivation {
-            pname = "fcuny.net";
-            version = self.lastModifiedDate;
-            src = ./.;
-            buildInputs = [ hugo git ];
-            buildPhase = ''
-              mkdir -p $out
-              hugo --minify --destination $out
-            '';
-            dontInstall = true;
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+        caddyfile = ./Caddyfile;
+      in
+      {
+        packages = {
+          site = with pkgs;
+            stdenv.mkDerivation {
+              pname = "fcuny.net";
+              version = self.lastModifiedDate;
+              src = ./.;
+              buildInputs = [ hugo git ];
+              buildPhase = ''
+                mkdir -p $out
+                hugo --minify --destination $out
+              '';
+              dontInstall = true;
+            };
+          container = pkgs.dockerTools.buildLayeredImage {
+            name = self.packages."${system}".site.pname;
+            tag = self.packages."${system}".site.version;
+            config = {
+              Cmd = [ "${pkgs.caddy}/bin/caddy" "run" "--adapter" "caddyfile" "--config" "${caddyfile}" ];
+              Env = [
+                "SITE_ROOT=${self.packages."${system}".site}"
+              ];
+            };
           };
-
-        defaultApp = pkgs.writers.writeBashBin "run-hugo" ''
-          set -e
-          set -o pipefail
-          export PATH=${pkgs.lib.makeBinPath [ pkgs.hugo pkgs.git ]}
-          hugo server -D
-        '';
-
-        apps = {
-          deploy = pkgs.pkgs.writeShellScriptBin "run-deploy" ''
+          deploy = pkgs.writeShellScriptBin "deploy" ''
             set -euxo pipefail
-            export PATH=${
-              pkgs.lib.makeBinPath [ pkgs.hugo pkgs.git pkgs.jq pkgs.flyctl ]
-            }:$PATH
-            bash ./scripts/deploy.sh
+            export PATH="${pkgs.lib.makeBinPath [(pkgs.docker.override { clientOnly = true; }) pkgs.flyctl]}:$PATH"
+            archive=${self.packages.x86_64-linux.container}
+            # load archive, drop all output except last line case of warnings), print image name
+            image=$(docker load < $archive | tail -n1 | awk '{ print $3; }')
+            flyctl deploy --image $image --local-only
           '';
+          hugo = pkgs.writeShellScriptBin "hugo" ''
+            set -euo pipefail
+            export PATH=${pkgs.lib.makeBinPath [ pkgs.hugo pkgs.git ]}
+            hugo server -D
+          '';
+        };
+
+        apps = {
+          deploy = {
+            type = "app";
+            program = "${self.packages."${system}".deploy}/bin/deploy";
+          };
+          default = {
+            type = "app";
+            program = "${self.packages."${system}".hugo}/bin/hugo";
+          };
         };
 
+        defaultPackage = self.packages."${system}".container;
+
         devShell =
-          pkgs.mkShell { buildInputs = with pkgs; [ hugo flyctl git jq ]; };
+          pkgs.mkShell { buildInputs = with pkgs; [ hugo flyctl git ]; };
       });
 }