Create script to auto-deploy with retries

packages/auto-deploy/default.nix

@@ -0,0 +1,16 @@
+{
+  deploy-rs,
+  gitMinimal,
+  writeShellApplication,
+  lib,
+  ...
+}:
+writeShellApplication {
+  name = "auto-deploy";
+  meta.description = "Deploy machines automatically.";
+  runtimeInputs = [
+    deploy-rs
+    gitMinimal
+  ];
+  text = lib.readFile ./script.bash;
+}

packages/auto-deploy/script.bash

@@ -0,0 +1,49 @@
+#!/usr/bin/env bash
+
+#### Environment
+FLAKE_ROOT="$(git rev-parse --show-toplevel)"
+
+export PROFILE="${1:-''}"
+if [ -z "${PROFILE}" ]; then
+  echo "🛑 Error: No deployment profile was specified as first parameter (e.g. \"${0} system-vm\")" 1>&2
+  exit 1
+fi
+
+HOSTS=$(nix eval --raw "${FLAKE_ROOT}"#deploy.nodes --apply "
+   nodes: let
+     inherit (builtins) attrNames filter concatStringsSep;
+     names = attrNames nodes;
+     profile = \"${PROFILE}\";
+     filteredNames = filter (name: nodes.\${name}.profiles ? \${profile}) names;
+   in concatStringsSep \"\\n\" filteredNames
+")
+if [ -z "$HOSTS" ]; then
+  echo "🛑 Error: No deployments matching the profile ${PROFILE} were found." 1>&2
+  exit 1
+fi
+
+KNOWN_HOSTS_FILE=$(nix eval --raw .#nixosConfigurations.lindberg.config.environment.etc."ssh/ssh_known_hosts".source)
+
+#### Helpers
+retry() {
+  local -r -i max_attempts="$1"
+  shift
+  local -i attempt_num=1
+  until "$@"; do
+    if ((attempt_num == max_attempts)); then
+      echo "⚠️ Warning: Attempt $attempt_num failed and there are no more attempts left!"
+      return 1
+    else
+      echo "⚠️ Attempt $attempt_num failed! Trying again in $attempt_num seconds..."
+      sleep $((attempt_num++))
+    fi
+  done
+}
+
+#### Execution
+for HOST in $HOSTS; do
+  retry 3 deploy \
+    --skip-checks \
+    --ssh-opts "-o UserKnownHostsFile=${KNOWN_HOSTS_FILE}" \
+    --targets "${FLAKE_ROOT}#\"${HOST}\".\"${PROFILE}\""
+done