[expo-updates] Add ability to override build-time fingerprint (#27597)

expo · Mar 15, 2024 · cb0bf27 · cb0bf27
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diff --git a/packages/expo-updates/CHANGELOG.md b/packages/expo-updates/CHANGELOG.md
@@ -17,6 +17,8 @@
 - Add --version top-level flag and also add handler for missing command in expo-update cli. ([#27296](https://github.com/expo/expo/pull/27296) by [@wschurman](https://github.com/wschurman))
 - Add more debug information to runtimeversion:resolve CLI output. ([#27323](https://github.com/expo/expo/pull/27323), [#27387](https://github.com/expo/expo/pull/27387) by [@wschurman](https://github.com/wschurman))
 - Added React Native New Architecture support. ([#27216](https://github.com/expo/expo/pull/27216) by [@kudo](https://github.com/kudo))
+- Add ability to override build-time fingerprint. ([#27597](https://github.com/expo/expo/pull/27597) by [@wschurman](https://github.com/wschurman))
+
 
 ### 🐛 Bug fixes
 

diff --git a/packages/expo-updates/utils/build/createFingerprintForBuildAsync.js b/packages/expo-updates/utils/build/createFingerprintForBuildAsync.js
diff --git a/packages/expo-updates/utils/src/createFingerprintForBuildAsync.ts b/packages/expo-updates/utils/src/createFingerprintForBuildAsync.ts
@@ -38,10 +38,18 @@ export async function createFingerprintForBuildAsync(
     return;
   }
 
-  const workflow = await resolveWorkflowAsync(projectRoot, platform);
-  const fingerprint = await createFingerprintAsync(projectRoot, platform, workflow, {});
+  let fingerprint: { hash: string };
 
-  console.log(JSON.stringify(fingerprint.sources));
+  const override = process.env.EXPO_UPDATES_FINGERPRINT_OVERRIDE;
+  if (override) {
+    console.log(`Using fingerprint from EXPO_UPDATES_FINGERPRINT_OVERRIDE: ${override}`);
+    fingerprint = { hash: override };
+  } else {
+    const workflow = await resolveWorkflowAsync(projectRoot, platform);
+    const createdFingerprint = await createFingerprintAsync(projectRoot, platform, workflow, {});
+    console.log(JSON.stringify(createdFingerprint.sources));
+    fingerprint = createdFingerprint;
+  }
 
   fs.writeFileSync(path.join(destinationDir, 'fingerprint'), fingerprint.hash);
 }