build.gradle

import java.io.IOException
plugins{
    id 'com.android.application' version '8.7.2' apply false
    id 'com.android.library' version '8.7.2' apply false
}

String getGitHash(String project) {
    def command = Runtime.getRuntime().exec("git rev-list -1 HEAD " + project)
    def returnCode = command.waitFor()
    if (returnCode != 0) {
        throw new IOException("Command 'getGitHash()' exited with " + returnCode)
    }
    String gitCommitHash = command.inputStream.text.trim()
    return gitCommitHash
}

Boolean gitUsed() {
    def returnCode = Runtime.getRuntime().exec("git rev-parse --is-inside-work-tree").waitFor()
    switch(returnCode){
        case 127:
          println("git not found");
          return false;
          break;
        case 128:
          println("not inside a git repository");
          return false;
          break;
        case 0:
          return true;
        default:
          throw new IOException("Command 'gitUsed()' exited with " + returnCode)
  }
}