- hosts: "{{host}}"
  gather_facts: false
  vars:
    repo: "repo_name"
    remote_dir: "/path/to/deploy_dir"
  tasks:
  - name: check whether {{repo}}.bak exists
    shell: ls {{repo}}.bak || true
    args:
      chdir: "{{remote_dir}}"
    register: repo_bak_exists
  - name: restore old {{repo}}
    shell: cd {{remote_dir}} && rm -rf {{repo}} && mv {{repo}}.bak {{repo}}
    when: repo_bak_exists.stdout != ''
  - debug:
      msg: "Not found {{repo}}.bak, quit"
    when: repo_bak_exists.stdout == ''