An attempt to provide advanced battery stats for Android
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README.md

Build CircleCI

#License BetterBatteryStats is an open source project unter the terms of the Apache 2.0 License. The license does not apply to the use of the names "BetterBatteryStats" and "Better Battery Stats", nor to the icon / artwork created for BetterBatteryStats.

Build

In order to build (with gradle / Android Studio) following changes to the local project are required

HockeyApp

The environment variable HOCKEYAPP_APP_ID must be set to a valid value

Signing

The signing config uses environment variables:

    signingConfigs {
        release {
            storeFile file(System.getenv("KEYSTORE_RELEASE"))
            storePassword System.getenv("KEYSTORE_PASSWORD")
            keyAlias System.getenv("KEY_ALIAS")
            keyPassword System.getenv("KEY_PASSWORD")
        }
        debug {
            storeFile file(System.getenv("KEYSTORE_DEBUG"))
        }
    }
  • KEYSTORE_RELEASE points to the release .keystore file
  • KEYSTORE_DEBUG points to the debug .keystore file
  • KEY_ALIAS defines the alias name
  • KEY_PASSWORD is the keystore password

Continuous Integration

The continuous integration (in this example CircleCI) needs to have access to some private settings.

Google play publishing

Publishing profile

The encrypted file (sa-google-play.json-cipher) is located in /app, and referenced by the gradle build.

See also https://github.com/Triple-T/gradle-play-publisher.

Deploy task

In circle.yml we define that all the google play publishing (to beta) is triggered on tag release-*

Encrypt

openssl aes-256-cbc -e -in secret-env-plain -out secret-env-cipher -k $KEY

See also https://github.com/circleci/encrypted-files

Decrypt (on CircleCI, as defined in circle.yml and using an env-variable KEY)

openssl aes-256-cbc -d -in secret-file-cipher -out secret-file-plain -k $KEY

The signing keys

The environment variables $KEYSTORE_RELEASE, $KEYSTORE_DEBUG, $KEY_ALIAS, $KEY_PASSWORD and $KEYSTORE_PASSWORDmust be set.

There variables are set in secret-env-plain (not part of the project for obvious reasons).

In order to run your own build create a file secret-env-plain and set the variables:

export KEYSTORE_PASSWORD=<your-keystore-pwd>
export KEY_PASSWORD=<your-key-pwd>
export KEY_ALIAS=<your-key-alias>
export KEYSTORE_DEBUG=<name-of-debug-keystore>
export KEYSTORE_RELEASE=<name-of-release-keystore>

and then encrypt this file using openssl aes-256-cbc -e -in secret-env-plain -out secret-env-cipher -k $KEY

In the piepline the decyption is done using the script circleciscripts/decrypt_env_vars.sh with the $KEY stored in circle-ci's env vars.

As the signing keys are not in the github repo a script circleciscripts/download_keystore.sh does the job of downloading and decrypting the keys at build-time. For that to happen following addition environment variables must be set:

  • $KEYSTORE_URI a public URI from where the files can be downloaded using http
  • $KEY the key to decrypt the keystores (same env var as for google-services.json)