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+# Description
+
+This document describes how to update Status APK builds for the [F-Droid](https://f-droid.org/) Android application catalogue.
+
+# Intro
+
+In simplest terms F-Droid requires a YAML file that defines the steps necessary to create a universal unsigned APK build. This is achieved by submitting a new app versions into the `metadata/im.status.ethereum.yml` file in the [fdroiddata](https://gitlab.com/fdroid/fdroiddata) repository.
+
+The app builds defined this way run on servers that generate the unsigned APKs using the [fdroidserver](https://gitlab.com/fdroid/fdroidserver) software. The [server setup](https://f-droid.org/en/docs/Build_Server_Setup/) is quite involved but is not necessary unless you want to run your own instance. Normally the applications defines in `fdroiddata` are built by servers maintained by [the F-Droid volunteers](https://f-droid.org/en/contribute/).
+
+First release of Status app was merged in [fdroid/fdroiddata#7179](https://gitlab.com/fdroid/fdroiddata/-/merge_requests/7179).
+
+# Adding New Versions
+
+You can find our configuration file at [`metadata/im.status.ethereum.yml`](https://gitlab.com/fdroid/fdroiddata/-/blob/master/metadata/im.status.ethereum.yml)
+
+The file defines all the necessary metadata like `SourceCode`, `Website`, or `License`, but the most important key is `Builds`, which looks like this:
+```yml
+Builds:
+  - versionName: 1.4.1
+    versionCode: 2020070112
+    commit: cfb825a11b61d312af8cb5d36686af540c31f481
+    sudo:
+      - mkdir -m 0755 /nix
+      - chown vagrant /nix
+    init: ./nix/scripts/setup.sh
+    output: ./result/app-release-unsigned.apk
+    scanignore:
+      - android/build.gradle
+    scandelete:
+      - ios
+    build: make release-android BUILD_TYPE=release BUILD_NUMBER=2020070112 ANDROID_APK_SIGNED=false
+```
+It contains a list of objects defining each release of the application. In order to add a new release simply copy a previous release object and adjust the following values:
+
+* `versionName` - String version like `1.4.1`
+* `versionCode` - Android `versionCode`. We use a timestamp generated by [a script](../scripts/version/gen_build_no.sh)
+* `commit` - Specific commit SHA1 from which the given release was built
+* `BUILD_NUMBER` in `build` step - Same value as `versionCode`
+
+The `versionCode` should be the same as the one in build that was uplodade to Play Store. It can be found in the build logs or by using:
+```
+ > apkanalyzer manifest version-code StatusIm-v1.4.1.apk
+2020070112
+```
+
+At the bottom of the file you should also update the following keys:
+
+* `CurrentVersion` - Same as the new `versionName` added
+* `CurrentVersionCode` - Same as the `versionCode` added
+
+Then submit a merge request to the [fdroid/fdroiddata](https://gitlab.com/fdroid/fdroiddata) repository.
+
+# Checking Builds
+
+The simplest way to test if the app builds via F-Droid is to use the Docker image:
+https://gitlab.com/fdroid/docker-executable-fdroidserver
+
+Which is available under `registry.gitlab.com/fdroid/docker-executable-fdroidserver:latest`.
+
+Because we use Nix to build the mobile app we need to slightly modify the image with this `Dockerfile`:
+```Dockerfile
+FROM registry.gitlab.com/fdroid/docker-executable-fdroidserver:latest
+ARG BUILDER_UID=1000
+ENV BUILDER_USER=vagrant
+RUN useradd -u $BUILDER_UID $BUILDER_USER
+RUN mkdir -m 0755 /nix /home/$BUILDER_USER \
+ && chown -R $BUILDER_USER /nix /home/$BUILDER_USER
+```
+Build it using:
+```
+docker build --build-arg=BUILDER_UID=$UID -t statusteam/docker-executable-fdroidserver:latest .
+```
+Then clone the [fdroiddata](https://gitlab.com/fdroid/fdroiddata) and [fdroidserver](https://gitlab.com/fdroid/fdroidserver) repos and use it to test the build of a specific Status Android app version: `1.4.1`
+```
+docker run --rm \
+  -u $UID:$GID \
+  -v $(pwd)/nix:/nix \
+  -v $(pwd)/fdroiddata:/repo \
+  -v $(pwd)/fdroidserver:/fdroidserver \
+  statusteam/docker-executable-fdroidserver:latest \
+  build im.status.ethereum:1.4.1
+```
+We have to create a user and specify the UID because Nix cannot run as `root` and that is the default user for the F-Droid Docker image. By adding our own user and setting the UID we also make it possible to mount folders like `fdroiddata` and `fdroidserver`.
+
+You can specify a `--vebose` flag for `build` command for additional information.
+
+You should also run `lint im.status.ethereum` to verify the YAML format is correct.
+
+# Details
+
+The original research was done in [#8512](https://github.com/status-im/status-react/issues/8512).
+
+Normally F-Droid server wants to run Gradle itself, but we do not specify the `gradle` key in order to run `make release-android` ourselves in `build` step.