Add script for using local plugeth-statediff.

scripts/update-mod.sh

@@ -0,0 +1,25 @@
+#!/bin/sh
+
+PLUGETH_STATEDIFF_DIR=`echo "$(cd "$(dirname "$1")"; pwd)/$(basename "$1")"`
+TARGET_GOMOD_DIR=${2} 
+
+cd $TARGET_GOMOD_DIR
+if [ $? -ne 0 ]; then
+  echo "Unable to cd to $TARGET_GOMOD_DIR"
+  exit 1
+fi
+
+CURRENT_REPLACEMENTS=$(go mod edit --json | jq -r '.Replace[] | "\(.Old.Path) \(.New.Path)"')
+
+go mod edit --replace "github.com/cerc-io/plugeth-statediff=${PLUGETH_STATEDIFF_DIR}"
+for r in `go mod edit --json ${PLUGETH_STATEDIFF_DIR}/go.mod | jq -r '.Replace[] | "\(.Old.Path)=\(.New.Path)@\(.New.Version)"'`; do
+  orig=$(echo $r | cut -d'=' -f1)
+  rep=$(echo $r | cut -d'=' -f2 | cut -d'@' -f1)
+  echo "$CURRENT_REPLACEMENTS" | grep "$orig" | grep  "$rep" > /dev/null
+  if [ $? -ne 0 ]; then
+    continue;
+  fi
+  go mod edit --replace "$r"
+done
+
+go mod tidy -e 2>/dev/null