Fix Cargo.lock version 4 compatibility in GitHub Actions workflows

Author: devloai[bot]

.github/workflows/README.md

@@ -129,7 +129,10 @@ If you encounter Cargo lock file version compatibility issues:
 
 1. The workflow now explicitly updates Cargo to the latest stable version
 2. We've added a specific step that runs `rustup update stable` and `rustup default stable`
-3. This ensures compatibility with Cargo.lock version 4 format
+3. Cargo version is explicitly checked and logged for troubleshooting
+4. The workflow automatically regenerates the Cargo.lock file to ensure it uses a format compatible with the current Cargo version
+5. This ensures compatibility with Cargo.lock version 4 format (used in newer Rust versions)
+6. Any existing Cargo.lock is deleted and freshly regenerated to avoid format conflicts
 
 #### Build Command Not Found
 

.github/workflows/build.yml

@@ -31,7 +31,23 @@ jobs:
         run: |
           rustup update stable
           rustup default stable
+          # Check Cargo version explicitly
           cargo --version
+          echo "Using Cargo from: $(which cargo)"
+          # Ensure we can handle Cargo.lock version 4
+          echo "Cargo can handle lock version: $(cargo --version | grep -oE '[0-9]+\.[0-9]+\.[0-9]+')"
+
+      - name: Regenerate Cargo.lock
+        run: |
+          # Remove any existing Cargo.lock
+          if [ -f Cargo.lock ]; then
+            echo "Removing existing Cargo.lock"
+            rm Cargo.lock
+          fi
+          # Regenerate Cargo.lock with the latest Cargo version
+          echo "Regenerating Cargo.lock"
+          cargo generate-lockfile
+          echo "Cargo.lock regenerated successfully"
 
       - name: Install Solana CLI
         run: |

.github/workflows/tornado_testnet_transaction.yml

@@ -72,7 +72,23 @@ jobs:
         run: |
           rustup update stable
           rustup default stable
+          # Check Cargo version explicitly
           cargo --version
+          echo "Using Cargo from: $(which cargo)"
+          # Ensure we can handle Cargo.lock version 4
+          echo "Cargo can handle lock version: $(cargo --version | grep -oE '[0-9]+\.[0-9]+\.[0-9]+')"
+
+      - name: Regenerate Cargo.lock
+        run: |
+          # Remove any existing Cargo.lock
+          if [ -f Cargo.lock ]; then
+            echo "Removing existing Cargo.lock"
+            rm Cargo.lock
+          fi
+          # Regenerate Cargo.lock with the latest Cargo version
+          echo "Regenerating Cargo.lock"
+          cargo generate-lockfile
+          echo "Cargo.lock regenerated successfully"
       
       - name: Setup metrics directory
         run: |

docs/github_actions.md

@@ -158,9 +158,23 @@ If your workflow fails with errors about Cargo.lock version compatibility:
    rustup default stable
    ```
 
-2. **Version verification:** The workflow now verifies the Cargo version before proceeding with builds
+2. **Version verification:** The workflow now verifies the Cargo version before proceeding with builds:
+   ```bash
+   cargo --version
+   echo "Using Cargo from: $(which cargo)"
+   ```
+
+3. **Automatic regeneration:** The workflow automatically regenerates the Cargo.lock file with the correct format:
+   ```bash
+   # Remove any existing Cargo.lock
+   if [ -f Cargo.lock ]; then
+     rm Cargo.lock
+   fi
+   # Regenerate with latest Cargo version
+   cargo generate-lockfile
+   ```
 
-3. **Compatibility:** These steps ensure compatibility with Cargo.lock version 4 format
+4. **Compatibility:** These steps ensure compatibility with Cargo.lock version 4 format (used in newer Rust versions)
 
 #### Solana Build Command Not Found