Gracefully shutdown optimism batcher and op-geth containers (#345)

* Gracefully shutdown optimism batcher and op-geth containers

* Remove unnecessary env export

app/data/config/fixturenet-optimism/run-op-batcher.sh

@@ -9,6 +9,15 @@ CERC_L1_RPC="${CERC_L1_RPC:-${DEFAULT_CERC_L1_RPC}}"
 # Get BACTHER_KEY from keys.json
 BATCHER_KEY=$(jq -r '.Batcher.privateKey' /l2-accounts/keys.json | tr -d '"')
 
+cleanup() {
+    echo "Signal received, cleaning up..."
+    kill ${batcher_pid}
+
+    wait
+    echo "Done"
+}
+trap 'cleanup' INT TERM
+
 op-batcher \
   --l2-eth-rpc=http://op-geth:8545 \
   --rollup-rpc=http://op-node:8547 \
@@ -23,4 +32,8 @@ op-batcher \
   --max-channel-duration=1 \
   --target-l1-tx-size-bytes=2048 \
   --l1-eth-rpc=$CERC_L1_RPC \
-  --private-key=$BATCHER_KEY
+  --private-key=$BATCHER_KEY \
+  &
+
+batcher_pid=$!
+wait $batcher_pid

app/data/config/fixturenet-optimism/run-op-geth.sh

@@ -47,6 +47,15 @@ fi
 SEQUENCER_ADDRESS=$(jq -r '.Sequencer.address' /l2-accounts/keys.json | tr -d '"')
 echo "SEQUENCER_ADDRESS: ${SEQUENCER_ADDRESS}"
 
+cleanup() {
+    echo "Signal received, cleaning up..."
+    kill ${geth_pid}
+
+    wait
+    echo "Done"
+}
+trap 'cleanup' INT TERM
+
 # Run op-geth
 geth \
   --datadir ./datadir \
@@ -74,4 +83,8 @@ geth \
   --allow-insecure-unlock \
   --mine \
   --miner.etherbase=$SEQUENCER_ADDRESS \
-  --unlock=$SEQUENCER_ADDRESS
+  --unlock=$SEQUENCER_ADDRESS \
+  &
+
+geth_pid=$!
+wait $geth_pid

app/data/stacks/fixturenet-optimism/README.md

@@ -91,6 +91,9 @@ docker volume rm $(docker volume ls -q --filter "name=.*fixturenet_geth_accounts
   ```
 
 * This means that the data directory that `op-geth` is using is corrupted and needs to be reinitialized; the containers `op-geth`, `op-node` and `op-batcher` need to be started afresh:
+
+  WARNING: This will reset the L2 chain; consequently, all the data on it will be lost
+
   * Stop and remove the concerned containers:
 
     ```bash