surrender

.woodpecker/job.yaml

@@ -15,4 +15,4 @@ steps:
     image: bash
     commands:
       - '[ "${CI_COMMIT_BRANCH:-}" = "master" ] || { echo "skipping deploy on branch ${CI_COMMIT_BRANCH:-unknown}"; exit 0; }'
-      -  /usr/local/libexec/deploy-kotsukotsu
+      - bash ./scripts/deploy-app.sh

nix/module.nix

@@ -2,6 +2,14 @@
 
 let
   cfg = config.services.kotsukotsu;
+  launcher = pkgs.writeShellScript "kotsukotsu-launch" ''
+    exec ${cfg.currentPath}/bin/kotsukotsu
+  '';
+  ensureCurrent = pkgs.writeShellScript "kotsukotsu-ensure-current" ''
+    if [ ! -e ${cfg.currentPath} ]; then
+      ln -sfn ${cfg.package} ${cfg.currentPath}
+    fi
+  '';
 in
 {
   options.services.kotsukotsu = {
@@ -38,6 +46,12 @@ in
       description = "Directory for the persistent SQLite database.";
     };
 
+    currentPath = lib.mkOption {
+      type = lib.types.str;
+      default = "/var/lib/kotsukotsu/current";
+      description = "Stable symlink path that points at the active app package.";
+    };
+
     user = lib.mkOption {
       type = lib.types.str;
       default = "kotsukotsu";
@@ -71,6 +85,10 @@ in
         assertion = lib.hasPrefix "/" cfg.dataDir;
         message = "services.kotsukotsu.dataDir must be an absolute path.";
       }
+      {
+        assertion = lib.hasPrefix "/" cfg.currentPath;
+        message = "services.kotsukotsu.currentPath must be an absolute path.";
+      }
     ];
 
     users.groups = lib.mkIf (cfg.group == "kotsukotsu") {
@@ -104,7 +122,8 @@ in
       };
 
       serviceConfig = {
-        ExecStart = lib.getExe cfg.package;
+        ExecStart = launcher;
+        ExecStartPre = ensureCurrent;
         Group = cfg.group;
         Restart = "on-failure";
         User = cfg.user;

scripts/deploy-app.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+target_host="${1:-root@sortug.com}"
+service_name="${SERVICE_NAME:-kotsukotsu}"
+current_path="${CURRENT_PATH:-/var/lib/kotsukotsu/current}"
+health_url="${HEALTH_URL:-http://127.0.0.1:5174/healthz}"
+
+store_path="$(nix build --accept-flake-config --print-out-paths .#default | tail -n 1)"
+
+echo "Built ${store_path}"
+echo "Copying package to ${target_host}"
+nix copy --to "ssh://${target_host}" "${store_path}"
+
+echo "Activating release on ${target_host}"
+ssh "${target_host}" "
+  set -euo pipefail
+  ln -sfn '${store_path}' '${current_path}'
+  systemctl restart '${service_name}'
+  for _ in 1 2 3 4 5 6 7 8 9 10; do
+    if curl -fsS '${health_url}' >/dev/null; then
+      exit 0
+    fi
+    sleep 1
+  done
+  echo 'health check failed for ${service_name}' >&2
+  exit 1
+"