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| -rw-r--r-- | android/BuildInstructions.md | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/android/BuildInstructions.md b/android/BuildInstructions.md index adde516cf5..da38741f40 100644 --- a/android/BuildInstructions.md +++ b/android/BuildInstructions.md @@ -261,15 +261,24 @@ To maximize reproducibility when building without the container: A simple way to check that a build is reproducible across environments is to build the `fdroid` version of the app with and without the container and comparing the checksums of the produced APKs. 1. Build the app with the container: `../building/containerized-build.sh android --fdroid` -2. Copy the resulting APK to a different folder as it will be overwritten in the following step: `app/build/outputs/apk/ossProd/fdroid/app-oss-prod-fdroid-unsigned.apk fdroid-container.apk` -3. Build the app locally without the container: `./build.sh --fdroid` -4. Compare the checksums of the two APKs: `md5sum fdroid-container.apk app/build/outputs/apk/ossProd/fdroid/app-oss-prod-fdroid-unsigned.apk` +1. Copy the resulting APK to a different folder as it will be overwritten in the following step: `app/build/outputs/apk/ossProd/fdroid/app-oss-prod-fdroid-unsigned.apk fdroid-container.apk` +1. Build the app locally without the container: `./build.sh --fdroid` +1. Compare the checksums of the two APKs: `sha256sum fdroid-container.apk app/build/outputs/apk/ossProd/fdroid/app-oss-prod-fdroid-unsigned.apk` + +## Verifying that an official release is reproducible + +1. Obtain the release APK (`2025.2-beta1` or newer) from [GitHub releases](https://github.com/mullvad/mullvadvpn-app/releases) +1. Checkout the release tag: `git checkout android/<version>` +1. Build a release build using our [build instructions](#release-build) +1. Delete the signatures from the two APKs by running `zip -d app-oss-prod-release.apk "META-INF/*"` and `zip -d MullvadVPN-<version>.apk "META-INF/*"` +1. Compare the checksums of the two APKs: `sha256sum app-oss-prod-release.apk MullvadVPN-<version>.apk`. If the checksums are equal the build is reproducible. ### Troubleshooting reproducibility If two APKs built from the same commit have different checksums the build is not reproducible. This could be because of either: 1. A build dependency on the local system has the wrong version. -2. There is a bug that breaks the build reproducibility. +1. There is a bug that breaks the build reproducibility. +1. The APK built is a version prior to `2025.2-beta1`, which is the first version that supports reproducible builds. If you suspect that a bug is causing the build to not be reproducible, please open a Github issue. |