Try new approach

Author: vrom911

.github/workflows/demo-test.yaml

@@ -1,21 +1,20 @@
-name: "Demo Sanity Check"
+
+name: "Demo test"
 
 on:
+  # We're using merge-chains; so this needs to run then.
   merge_group:
   push:
     branches:
       - master
-      - release
   pull_request:
-  workflow_dispatch:
 
 jobs:
   demo-test:
+    runs-on: ${{ matrix.os }}
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]
-    runs-on: ${{ matrix.os }}
-    name: "Test demo on ${{ matrix.os }}"
     steps:
       - uses: actions/checkout@v4
         with:
@@ -26,49 +25,7 @@ jobs:
         with:
           authToken: '${{ secrets.CACHIX_CARDANO_SCALING_AUTH_TOKEN }}'
 
-      - name: Set up and use the "demo" devShell
-        uses: nicknovitski/nix-develop@v1
-        with:
-          arguments: ".#demo"
-
-      - name: Modify demo to run headlessly
+      - name: ❄ Check demo test
         run: |
-          sed -i.bak 's/is_foreground = true/is_foreground = false/g' nix/hydra/demo.nix
+          nix develop .#demo -c bash -c "cd demo && ./test.sh"
 
-      - name: Create devnet log directory
-        run: mkdir -p devnet/logs
-
-      - name: Run demo in background
-        run: |
-          nix run .#demo > process-compose.out 2> process-compose.err &
-          echo $! > process-compose.pid
-          sleep 5
-
-      - name: Wait for hydra nodes to be ready
-        run: |
-          set -e
-          echo "Waiting for hydra nodes to start..."
-          if ! nix shell nixpkgs#coreutils -c timeout 300s bash -c '
-            until [ $(grep "is ready" devnet/logs/process-compose.log 2>/dev/null | wc -l) -ge 3 ]; do
-              echo -n "."
-              sleep 5
-              if ! ps -p $(cat process-compose.pid) > /dev/null; then
-                echo "Process-compose exited prematurely."
-                exit 1
-              fi
-            done
-            echo "All hydra nodes are ready!"
-          '; then
-            echo "Timed out or process-compose exited prematurely."
-            echo "--- stdout ---"
-            cat process-compose.out
-            echo "--- stderr ---"
-            cat process-compose.err
-            echo "--- process-compose.log ---"
-            cat devnet/logs/process-compose.log || echo "process-compose.log not found"
-            exit 1
-          fi
-      - name: Stop demo
-        if: always()
-        run: |
-          kill $(cat process-compose.pid) || true 

demo/.env

@@ -1 +1 @@
-HYDRA_SCRIPTS_TX_ID="Missing required scripts references. Run './seed-devnet.sh' to publish scripts on-chain and solve this."
+HYDRA_SCRIPTS_TX_ID=8c26f01ff685c42030be0d55b2dd522d59091379a396924e928683985f92fe7c,f217857299cde5b8aad4fd7b447f2910d3df90b247b885240e4346172c6b4b5b,727e5bb00a85b23085c49ea94f050a3b6c0af65474e573fa4b77d2b636919924

demo/test.sh

@@ -0,0 +1,65 @@
+
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+cleanup() {
+  echo "--- Cleaning up"
+  pkill -P $$ || true
+}
+
+trap cleanup EXIT
+
+echo "--- Setup devnet"
+./prepare-devnet.sh
+
+echo "--- Starting cardano-node"
+cardano-node run \
+  --config devnet/cardano-node.json \
+  --topology devnet/topology.json \
+  --database-path devnet/db \
+  --socket-path devnet/node.socket \
+  --shelley-operational-certificate devnet/opcert.cert \
+  --shelley-kes-key devnet/kes.skey \
+  --shelley-vrf-key devnet/vrf.skey > devnet/cardano-node.log 2>&1 &
+
+echo "--- Waiting for socket"
+while [ ! -S "devnet/node.socket" ]; do
+  sleep 1
+done
+echo "Socket created."
+
+echo "--- Seeding devnet"
+export CARDANO_NODE_SOCKET_PATH=devnet/node.socket
+./seed-devnet.sh $(which cardano-cli) $(which hydra-node) --mainnet-era babbage
+
+echo "--- Starting hydra-node"
+source .env
+hydra-node \
+  --node-id 1 \
+  --api-port 4001 \
+  --monitoring-port 6001 \
+  --peer 127.0.0.1:5002 \
+  --peer 127.0.0.1:5003 \
+  --hydra-signing-key alice.sk \
+  --hydra-verification-key bob.vk \
+  --hydra-verification-key carol.vk \
+  --hydra-scripts-tx-id $HYDRA_SCRIPTS_TX_ID \
+  --cardano-signing-key devnet/credentials/alice.sk \
+  --cardano-verification-key devnet/credentials/bob.vk \
+  --cardano-verification-key devnet/credentials/carol.vk \
+  --ledger-protocol-parameters devnet/protocol-parameters.json \
+  --testnet-magic 42 \
+  --node-socket devnet/node.socket \
+  --persistence-dir devnet/persistence/alice > devnet/hydra-node.log 2>&1 &
+
+sleep 2
+echo "--- Checking for hydra-node"
+if cat devnet/hydra-node.log | grep '"tag":"APIServerStarted"'; then
+  echo "OK"
+else
+  echo "FAIL"
+  cat devnet/hydra-node.log
+  exit 1
+fi
+

nix/hydra/demo.nix

@@ -16,10 +16,7 @@
 
           processes = {
             prepare-devnet = {
-              command = pkgs.writeShellScript "prepare-devnet-wrapped" ''
-                export PATH=${pkgs.coreutils}/bin:${pkgs.gnused}/bin:${pkgs.findutils}/bin:$PATH
-                exec ${self}/demo/prepare-devnet.sh
-              '';
+              command = "${self}/demo/prepare-devnet.sh";
             };
             cardano-node = {
               command = ''