build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    repositories {
        google()
        jcenter()
        maven { url 'https://maven.google.com' }
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.4.1'
    }
}


def gitHash() {
    try {
        def code = new ByteArrayOutputStream()
        exec {
            commandLine 'git', 'rev-parse', '--verify', '--short', 'HEAD'
            standardOutput = code
        }
        return code.toString().trim()
    }
    catch (ignored) {
        return "<unknown>"
    }
}

def gitDescribe(){
    try {
        def code = new ByteArrayOutputStream()
        exec {
            commandLine 'git', 'describe', '--always', '--dirty=-dirty'
            standardOutput = code
        }
        return code.toString().trim()
    }
    catch (ignored) {
        return "<unknown>"
    }
}

def gitVersion() {
    (gitDescribe() =~ /^v/).replaceFirst('')
}