Setting up environment to build PSLab Android app using Fdroid Build

Fdroid is a place for open source enthusiasts and developers to host their Free and Open Source Software (FOSS) for free and get more people onboard into their community. In order to host an app in their repository, one has to go through a several steps of builds and tests. This is to ensure that the software provided by them are as quality and safe as they can ever be. They are not allowing proprietary libraries or tools to integrate into any app or they will  be published outside the Fdroid main repository (fdroid-data) so that the users will know what they are downloading.

In a normal Linux computer where we are developing Android apps and have setup Android Studio will not be able to run the build command using:

$ fdroid build -v -l org.fossasia.pslab

The reason behind this is that we have not installed gradle and build tools required by the “fdroid build” because they are not useful in our day today activities for standalone activities. First thing we need to do is, install gradle separately. This will include adding gradle to $PATH as well.

Download the latest gradle version zip file or the version your project is using with the following command. In PSLab Android app, we are using 4.5.1 version and the snippet below include that version.

$ wget https://services.gradle.org/distributions/gradle-4.5.1-bin.zip

Next step is to install this in a local folder. We can select any path we want, but /opt/ folder is generally used in such scenarios.

sudo mkdir /opt/gradle
sudo unzip -d /opt/gradle gradle-4.5.1-bin.zip

Then we can add gradle to our $PATH variable using the following command:

$ export PATH=$PATH:/opt/gradle/gradle-4.5.1/bin

Now we are all set with gradle settings. Next step is to verify that the fdroid server is properly configured and up to date. When you run the build command after setting up the gradle in PC, it will throw an error similar to “failed to find any output apks”. This causes if the installed fdroid server version is old.

Fdroid server is running on python 3 and it will require some additional libraries pre-installed to properly function.

$ sudo apt-get install vagrant virtualbox git python3-certifi python3-libvirt python3-requestbuilder python3-yaml python3-clint python3-vagrant python3-paramiko python3-pyasn1 python3-pyasn1-modules

Once these libraries are installed, remove the previous instance of fdroidserver by using the following command:

$ sudo apt-get remove fdroidserver

Then we can reinstall the latest version of fdroid server from git using the following command:

$ git clone https://gitlab.com/fdroid/fdroidserver.git
export PATH="$PATH:$PWD/fdroidserver"

Now we are all set to do a brand new lint build on our PC to make our app ready to be published in Fdroid repository!

Reference:

  1. Install gradle : https://www.vultr.com/docs/how-to-install-gradle-on-ubuntu-16-10
  2. Gradle versions : https://gradle.org/releases
  3. Setting up Fdroid-server : https://f-droid.org/en/docs/Build_Server_Setup/

Installing fdroidserver : https://gitlab.com/fdroid/fdroiddata/blob/master/README.md#quickstart

Continue Reading

Building PSLab Android app with Fdroid

Fdroid is a place for open source enthusiasts and developers to host their Free and Open Source Software (FOSS) for free and get more people onboard into their community. Hosting an app in Fdroid is not a fairly easy process just like hosting one in Google Play. We need to perform a set of build checks prior to making a merge request (which is similar to pull request in GitHub) in the fdroid-data GitLab repository. PSLab Android app by FOSSASIA has undergone through all these checks and tests and now ready to be published.

Setting up the fdroid-server and fdroid-data repositories is one thing. Building our app using the tools provided by fdroid is another thing. It will involve quite a few steps to get started. Fdroid requires all the apps need to be built using:

$ fdroid build -v -l org.fossasia.pslab

 

This will output a set of logs which tell us what went wrong in the builds. The usual one in a first time app is obviously the build is not taking place at all. The reason is our metadata file needs to be changed to initiate a build.

Build:<versioncode>,<versionname>
    commit=<commit which has the build mentioned in versioncode>
    subdir=app
    gradle=yes

 

When a metadata file is initially created, this build is disabled by default and commit is set to “?”. We need to fill in those blanks. Once completed, it will look like the snippet above. There can be many blocks of “Build” can be added to the end of metadata file as we are advancing and upgrading through the app. As an example, the latest PSLab Android app has the following metadata “Build” block:

Build:1.1.5,7
    commit=0a50834ccf9264615d275a26feaf555db42eb4eb
    subdir=app
    gradle=yes

 

In case of an update, add another “Build” block and mention the version you want to appear on the Fdroid repository as follows:

Auto Update Mode:Version v%v
Update Check Mode:Tags
Current Version:1.1.5
Current Version Code:7

 

Once it is all filled, run the build command once again. If you have properly set the environment in your local PC, build will end successfully assuming there were no Java or any other language syntax errors.

It is worth to mention few other facts which are common to Android software projects. Usually the source code is packed in a folder named “app” inside the repository and this is the common scenario if Android Studio builds up the project from scratch. If this “app” folder is one level below the root, that is “android/app”, the build instructions shown above will throw an error as it cannot find the project files.

The reason behind this is we have mentioned “subdir=app” in the metadata file. Change this to “subdir=android/app” and run the build again. The idea is to direct the build to find where the project files are.

Apart from that, the commit can be represented by a tag instead of a long commit hash. As an example, if we had merge commits in PSLab labeled as “v.<versioncode>”, we can simply use “commit=v.1.1.5” instead of the hash code. It is just a matter of readability.

Happy Coding!

Reference:

  1. Metadata : https://f-droid.org/docs/Build_Metadata_Reference/#Build
  2. PSLab Android app Fdroid : https://gitlab.com/fdroid/fdroiddata/merge_requests/3271/diffs

Continue Reading
Close Menu