---
- name: check whether {{repo}}.jar.bak exists
  shell: cd {{remote_dir}} && [ -f {{repo}}.jar.bak ]
  ignore_errors: true
  register: result
- name: revert {{repo}}.jar.bak
  when: result is succeeded
  shell: cd {{remote_dir}} && rm -f {{repo}}.jar && mv {{repo}}.jar.bak {{repo}}.jar