Fork and launch parachain script (#398)

* use chain instead of chain.base

* add the fork and launch script

* reorder the args

* change the default port when running on CI-host

docker/litmus-parachain-launch-config.yml

@@ -18,8 +18,7 @@ relaychain:
 # Parachain Configuration
 parachains:
 - image: litentry/litentry-parachain:latest
-  chain:
-    base: litmus-dev
+  chain: litmus-dev
   id: 2106
   parachain: true
   flags:

scripts/fork-parachain-and-launch.sh

@@ -0,0 +1,110 @@
+#!/bin/bash
+
+set -eo pipefail
+
+# this script:
+# - scrapes the state of a given parachain using `fork-off-substrate`
+# - save the state snapshot to a chain spec JSON
+# - use this chain spec to launch a local parachain network
+
+ROOTDIR=$(git rev-parse --show-toplevel)
+TMPDIR=$(mktemp -d /tmp/XXXXXX)
+
+FORK_OFF_SUBSTRATE_REPO="https://github.com/litentry/fork-off-substrate.git"
+
+function print_divider() {
+  echo "------------------------------------------------------------"
+}
+
+function usage() {
+  print_divider
+  echo "Usage: $0 [http-rpc-endpoint] [orig-chain] [fork-chain] [binary]"
+  echo 
+  echo "the http-rpc-endpoint has to be a reachabale HTTP-RPC URL (do not mix it up with ws port)"
+  echo 
+  echo "default:"
+  echo "http-rpc-endpoint: http://localhost:9933"
+  echo "orig-chain:        litmus"
+  echo "fork-chain:        litmus-dev"
+  echo "binary:            the binary copied from litentry/litentry-parachain:latest"
+  print_divider
+}
+
+[ $# -gt 4 ] && (usage; exit 1)
+
+case "$1" in
+  help|-h|--help)
+    usage
+    exit 1
+    ;;
+  *)
+    ;;
+esac
+
+ENDPOINT="${1:-http://localhost:9933}"
+ORIG_CHAIN=${2:-litmus}
+FORK_CHAIN=${3:-litmus-dev}
+CHAIN_TYPE=
+
+case "$FORK_CHAIN" in
+  litmus*)
+    CHAIN_TYPE=litmus ;;
+  litentry*)
+    CHAIN_TYPE=litentry ;;
+  *)
+    echo "unsupported chain type"
+    exit 1 ;;
+esac
+
+echo "TMPDIR is $TMPDIR"
+cd "$TMPDIR"
+git clone "$FORK_OFF_SUBSTRATE_REPO"
+cd fork-off-substrate
+npm i
+
+mkdir data && cd data
+
+# copy the binary
+if [ -z "$4" ]; then
+  docker cp $(docker create --rm litentry/litentry-parachain:latest):/usr/local/bin/litentry-collator binary
+else
+  cp "$4" binary
+fi
+chmod a+x binary
+
+# pop up a warning if on non-CI host
+if [ $(hostname) != "ubuntu-16gb-CI" ]; then
+  echo "WARNING: it seems you are not on the CI host"
+  echo "         please make sure the given HTTP-RPC endpoint accessible"
+else
+  # open the ssh port forwarding for a short time
+  ssh -f -L 9900:localhost:9933 litmus-sg-rpc0 sleep 120
+fi
+
+# retrieve the live wasm
+curl -s -H "Content-Type: application/json" -d '{"id":1, "jsonrpc":"2.0", "method": "state_getStorage", "params": [ "0x3a636f6465" ]}' "$ENDPOINT" | \
+jq .result | sed 's/"//g;s/^0x//' | xxd -r -p > runtime.wasm
+
+# write .env file
+cd ..
+cat << EOF > .env
+HTTP_RPC_ENDPOINT=$ENDPOINT
+ALICE=1
+ORIG_CHAIN=$ORIG_CHAIN
+FORK_CHAIN=$FORK_CHAIN
+EOF
+
+npm start
+
+if [ ! -f data/fork.json ]; then
+  echo "cannot find data/fork.json, please check it manually"
+  exit 2
+fi
+
+FORK_JSON_PATH="$(pwd)/data/fork.json"
+
+cd "$ROOTDIR"
+sed -i.bak "s;$FORK_CHAIN;$FORK_JSON_PATH;" docker/$CHAIN_TYPE-parachain-launch-config.yml
+
+# start the network
+make launch-docker-$CHAIN_TYPE