Check in CI that spm deinit takes the template app back to CocoaPods

.github/workflow-scripts/assert-spm-deinit.sh

@@ -0,0 +1,82 @@
+#!/bin/bash
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+# Checks that `npx react-native spm deinit` left an iOS app with only its
+# CocoaPods files. It checks only what deinit removes; `pod install` restores
+# the CocoaPods references, so they are not checked here.
+#
+# Usage: assert-spm-deinit.sh <ios-dir> <name.xcodeproj> <podfile-sha256> <gitignore-sha256|absent>
+
+if [ $# -ne 4 ]; then
+  echo "Usage: $0 <ios-dir> <name.xcodeproj> <podfile-sha256> <gitignore-sha256|absent>"
+  exit 2
+fi
+
+IOS_DIR=$1
+XCODEPROJ="$IOS_DIR/$2"
+EXPECTED_PODFILE_SHA256=$3
+EXPECTED_GITIGNORE_SHA256=$4
+PBXPROJ="$XCODEPROJ/project.pbxproj"
+FAILED=0
+
+fail() {
+  echo "::error::$1"
+  FAILED=1
+}
+
+sha256_or_absent() {
+  if [ -f "$1" ]; then
+    shasum -a 256 "$1" | cut -d ' ' -f 1
+  else
+    echo absent
+  fi
+}
+
+ACTUAL_PODFILE_SHA256=$(sha256_or_absent "$IOS_DIR/Podfile")
+if [ "$ACTUAL_PODFILE_SHA256" != "$EXPECTED_PODFILE_SHA256" ]; then
+  fail "Podfile changed: sha256 is '$ACTUAL_PODFILE_SHA256', expected '$EXPECTED_PODFILE_SHA256'."
+fi
+
+ACTUAL_GITIGNORE_SHA256=$(sha256_or_absent "$IOS_DIR/.gitignore")
+if [ "$ACTUAL_GITIGNORE_SHA256" != "$EXPECTED_GITIGNORE_SHA256" ]; then
+  fail ".gitignore changed: sha256 is '$ACTUAL_GITIGNORE_SHA256', expected '$EXPECTED_GITIGNORE_SHA256'."
+fi
+
+if [ -e "$XCODEPROJ/.spm-injected.json" ]; then
+  fail "$XCODEPROJ/.spm-injected.json is still there."
+fi
+
+if [ -e "$IOS_DIR/ReactNativeSPM" ]; then
+  fail "$IOS_DIR/ReactNativeSPM is still there."
+fi
+
+if [ ! -f "$PBXPROJ" ]; then
+  fail "$PBXPROJ is missing."
+else
+  for INJECTED in \
+    XCLocalSwiftPackageReference \
+    XCSwiftPackageProductDependency \
+    packageReferences \
+    packageProductDependencies \
+    ReactNativeSPM \
+    "Sync SPM Autolinking" \
+    "Embed React Native Flavored Frameworks"; do
+    if grep -qF "$INJECTED" "$PBXPROJ"; then
+      fail "$PBXPROJ still contains '$INJECTED'."
+    fi
+  done
+fi
+
+for SCHEME in "$XCODEPROJ"/xcshareddata/xcschemes/*.xcscheme; do
+  if [ -f "$SCHEME" ] && grep -qF 'title = "Sync SPM Autolinking"' "$SCHEME"; then
+    fail "$SCHEME still has the Sync SPM Autolinking pre-action."
+  fi
+done
+
+if [ $FAILED -ne 0 ]; then
+  exit 1
+fi
+echo "spm deinit removed every SwiftPM change."

.github/workflows/e2e-ios-templateapp.yml

@@ -64,6 +64,15 @@ jobs:
         uses: ./.github/actions/setup-spm-artifacts
         with:
           working-directory: /tmp/RNTestProject/ios
+      - name: Record the Podfile and .gitignore checksums
+        working-directory: /tmp/RNTestProject/ios
+        run: |
+          echo "PODFILE_SHA256=$(shasum -a 256 Podfile | cut -d ' ' -f 1)" >> "$GITHUB_ENV"
+          if [ -f .gitignore ]; then
+            echo "GITIGNORE_SHA256=$(shasum -a 256 .gitignore | cut -d ' ' -f 1)" >> "$GITHUB_ENV"
+          else
+            echo "GITIGNORE_SHA256=absent" >> "$GITHUB_ENV"
+          fi
       - name: Convert the app to SwiftPM
         working-directory: /tmp/RNTestProject/ios
         run: LANG=en_US.UTF-8 LC_ALL=en_US.UTF-8 RN_STRICT_API=1 npx react-native spm add --deintegrate --artifacts /tmp/spm-artifacts --download skip
@@ -83,6 +92,11 @@ jobs:
           name: RNTestProject-${{ matrix.flavor }}
           overwrite: true
           path: /tmp/RNTestProject/Build/Products/${{ matrix.flavor }}-iphonesimulator/RNTestProject.app
+      - name: Take the app back to CocoaPods
+        working-directory: /tmp/RNTestProject/ios
+        run: npx react-native spm deinit
+      - name: Check that only the CocoaPods files are left
+        run: ./.github/workflow-scripts/assert-spm-deinit.sh /tmp/RNTestProject/ios RNTestProject.xcodeproj "$PODFILE_SHA256" "$GITIGNORE_SHA256"
       - name: Report status
         id: report-status
         if: always()