Add genesis diff tool to report any changes made to genesis files (#378)

* Hoist validation diff-configs.sh to shared scripts dir

* Add validation/generate-genesis tool

* Update .gitignore

* Add github action for genesis-diff

Author: bitwiseguy

.github/workflows/genesis-diff.yml

@@ -0,0 +1,39 @@
+name: Genesis Diff
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  compute-genesis-diff:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+      with:
+        fetch-depth: 0  # Ensure the full history is fetched
+
+    - name: Fetch all branches
+      run: git fetch --all
+
+    - name: Generate configs at HEAD
+      working-directory: validation
+      run: |
+        go run generate-genesis/main.go HEAD
+
+    - name: Generate configs on base branch
+      working-directory: validation
+      run: |
+        # Get the base branch revision
+        base_rev=${{ github.event.pull_request.base.sha }}
+        echo "Base branch revision: $base_rev"
+        git checkout $base_rev -- ../superchain
+        go run generate-genesis/main.go base
+
+    - name: compute diff
+      working-directory: validation
+      id: run-command
+      run: |
+        ./scripts/diff-configs.sh ./generate-genesis/output-base ./generate-genesis/output-HEAD
+

.github/workflows/rollup-config-diff.yml

@@ -35,5 +35,5 @@ jobs:
       working-directory: validation
       id: run-command
       run: |
-        ./generate-rollup-config/diff-configs.sh ./generate-rollup-config/output-base ./generate-rollup-config/output-HEAD
+        ./scripts/diff-configs.sh ./generate-rollup-config/output-base ./generate-rollup-config/output-HEAD
 

validation/.gitignore

@@ -1 +1,2 @@
 generate-rollup-config/output-*
+generate-genesis/output-*

validation/generate-genesis/main.go

@@ -0,0 +1,42 @@
+package main
+
+import (
+	"encoding/json"
+	"log"
+	"os"
+	"path"
+
+	"github.com/ethereum-optimism/superchain-registry/superchain"
+	"github.com/ethereum/go-ethereum/core"
+)
+
+func main() {
+	rev := os.Args[1]
+
+	for chainID, chain := range superchain.OPChains {
+		gethGenesis, err := core.LoadOPStackGenesis(chainID)
+		if err != nil {
+			panic(err)
+		}
+
+		j, err := json.MarshalIndent(gethGenesis, "", "  ")
+		if err != nil {
+			panic(err)
+		}
+
+		dirPath := "./generate-genesis/output-" + rev
+
+		// Create the directory if it doesn't exist
+		if _, err := os.Stat(dirPath); os.IsNotExist(err) {
+			err := os.MkdirAll(dirPath, 0o755)
+			if err != nil {
+				log.Fatalf("Error creating directory: %v", err)
+			}
+		}
+
+		err = os.WriteFile(path.Join(dirPath, chain.Superchain+"-"+chain.Name+".json"), j, os.FileMode(0o644))
+		if err != nil {
+			panic(err)
+		}
+	}
+}