Hack some env var usage in

.github/workflows/network-test.yaml

@@ -67,7 +67,7 @@ jobs:
         sleep 5
         # :tear: socket permissions.
         sudo chown runner:docker devnet/node.socket
-        ./export-tx-id-and-pparams.sh
+        DEVNET_DIR=devnet HYDRA_NODE_CMD="nix run .#hydra-node --" ./export-tx-id-and-pparams.sh
         # Specify two docker compose yamls; the second one overrides the
         # images to use the netem ones specifically
         docker compose -f docker-compose.yaml -f docker-compose-netem.yaml up -d hydra-node-{1,2,3}

demo/export-tx-id-and-pparams.sh

@@ -6,15 +6,15 @@ SCRIPT_DIR=${SCRIPT_DIR:-$(realpath $(dirname $(realpath $0)))}
 NETWORK_ID=42
 
 CCLI_CMD=
-DEVNET_DIR=/devnet
+DEVNET_DIR="${DEVNET_DIR:-/devnet}"
 if [[ -n ${1} ]]; then
     echo >&2 "Using provided cardano-cli command: ${1}"
     $(${1} version > /dev/null)
     CCLI_CMD=${1}
     DEVNET_DIR=${SCRIPT_DIR}/devnet
 fi
 
-HYDRA_NODE_CMD=
+HYDRA_NODE_CMD="${HYDRA_NODE_CMD}"
 if [[ -n ${2} ]]; then
     echo >&2 "Using provided hydra-node command: ${2}"
     ${2} --version > /dev/null
@@ -41,6 +41,15 @@ function publishReferenceScripts() {
     --cardano-signing-key devnet/credentials/faucet.sk
 }
 
+DOCKER_COMPOSE_CMD=
+if [[ ! -x ${CCLI_CMD} ]]; then
+  if docker compose --version > /dev/null 2>&1; then
+    DOCKER_COMPOSE_CMD="docker compose"
+  else
+    DOCKER_COMPOSE_CMD="docker-compose"
+  fi
+fi
+
 # Invoke cardano-cli in running cardano-node container or via provided cardano-cli
 function ccli() {
   ccli_ ${@} --testnet-magic ${NETWORK_ID}