Include the work directory path in the bootstrap cache key

This is because the bootstrapped Pigweed environment does not like to be
relocated. Also don't touch submodules in bootstrap, other than ensuring that
Pigweed is available.

.github/actions/bootstrap/action.yaml

@@ -9,10 +9,26 @@ inputs:
     description: "Bootstrap log name"
     required: false
     default: bootstrap-logs-${{ github.job }}
+outputs:
+  cache-hit:
+    description: "Bootstrap environment was restored from cache"
+    value: ${{ fromJSON(steps.bootstrap-cache.outputs.outputs).cache-hit }} # retry returns all outputs in `outputs`
 
 runs:
   using: "composite"
   steps:
+    - name: Calculate bootstrap cache key
+      id: bootstrap-cache-key
+      shell: bash
+      run: |
+        # Calculate bootstrap cache key
+        # In addition to the various setup files, the work directory matters as well,
+        # because the bootstrapped Pigweed environment contains absolute paths.
+        FILES_HASH="${{ hashFiles('scripts/setup/*', 'third_party/pigweed/**') }}"
+        FINAL_HASH="$(echo "$PWD:$FILES_HASH" | shasum -a 256 | cut -d' ' -f1)"
+        echo "Calculated bootstrap cache key for '$PWD': $FINAL_HASH"
+        echo "hash=$FINAL_HASH" >> "$GITHUB_OUTPUT"
+
     - uses: Wandalen/[email protected]
       name: Bootstrap from cache
       id: bootstrap-cache
@@ -22,20 +38,20 @@ runs:
         attempt_limit: 3
         attempt_delay: 2000
         with: |
-          key: ${{ runner.os }}-${{ inputs.platform }}-env-${{ hashFiles('scripts/setup/*', 'third_party/pigweed/**') }}
+          key: ${{ runner.os }}-${{ inputs.platform }}-${{ steps.bootstrap-cache-key.outputs.hash}}
           path: |
               .environment
               build_overrides/pigweed_environment.gni
 
     - name: Run bootstrap
-      if: fromJSON(steps.bootstrap-cache.outputs.outputs).cache-hit != 'true' # retry returns all outputs in `outputs`
+      if: fromJSON(steps.bootstrap-cache.outputs.outputs).cache-hit != 'true'
       env:
         PW_NO_CIPD_CACHE_DIR: Y
       shell: bash
       run: source scripts/bootstrap.sh -p all,${{ inputs.platform }}
 
     - name: Uploading bootstrap logs
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       if: always() && !env.ACT && fromJSON(steps.bootstrap-cache.outputs.outputs).cache-hit != 'true'
       with:
         name: ${{ inputs.bootstrap-log-name }}

scripts/setup/bootstrap.sh

@@ -75,16 +75,6 @@ _bootstrap_or_activate() {
         unset PW_CONFIG_FILE
     fi
 
-    if [ ! -f "$_CHIP_ROOT/third_party/pigweed/repo/pw_env_setup/util.sh" ]; then
-        # Make sure our submodule remotes are correct for this revision.
-        git submodule sync --recursive
-        git submodule update --init
-    elif [ "$_BOOTSTRAP_NAME" = "bootstrap.sh" ]; then
-        # In this case, only update already checked out submodules.
-        git submodule sync --recursive
-        git submodule update
-    fi
-
     PW_BRANDING_BANNER="$_CHIP_ROOT/scripts/setup/banner.txt"
     export PW_BRANDING_BANNER
 
@@ -94,6 +84,10 @@ _bootstrap_or_activate() {
     PW_ROOT="$_CHIP_ROOT/third_party/pigweed/repo"
     export PW_ROOT
 
+    # Update or init the pigweed submodule if necessary. Don't touch any other submodules.
+    if [ "$_BOOTSTRAP_NAME" = "bootstrap.sh" -a ! -f "$_CHIP_ROOT/third_party/pigweed/repo/pw_env_setup/util.sh" ]; then
+        git submodule update --init "$_CHIP_ROOT/third_party/pigweed/repo"
+    fi
     . "$_CHIP_ROOT/third_party/pigweed/repo/pw_env_setup/util.sh"
 
     _chip_bootstrap_banner() {
@@ -105,7 +99,7 @@ _bootstrap_or_activate() {
 
     local _PW_BANNER_FUNC="_chip_bootstrap_banner"
 
-    # Force the Pigweed environment directory to be '.environment'
+    # Default the Pigweed environment directory to be '.environment'
     if [ -z "$PW_ENVIRONMENT_ROOT" ]; then
         export PW_ENVIRONMENT_ROOT="$PW_PROJECT_ROOT/.environment"
     fi