Ansible无法创建catkin工作区

Question

我让Ansible给ROS安排了几个树莓派。ROS安装得很好，但ansible不让我运行catkin_make：

fatal: [100.100.100.119]: FAILED! => {"changed": true, "cmd": "cd /home/ubuntu/catkin_ws; catkin_make", "delta": "0:00:00.012524", "end": "2019-09-23 13:47:24.918048", "msg": "non-zero return code", "rc": 127, "start": "2019-09-23 13:47:24.905524", "stderr": "/bin/bash: catkin_make: command not found", "stderr_lines": ["/bin/bash: catkin_make: command not found"], "stdout": "", "stdout_lines": []}

以下是我的攻略：

  - name: make Catkin folders
    file:
      path: "/home/ubuntu/catkin_ws/src"
      state: directory
      owner: ubuntu
      group: ubuntu
      mode: '0775'
    tags:
      - untested
  - name: Clone Git into Catkin Folder
    shell: cd /home/ubuntu/catkin_ws/src; git clone https://github.com/xxxxx
    become_user: ubuntu
    tags:
      - untested
  - name: Add bashrc
    shell: echo "source /opt/ros/melodic/setup.bash" >> /home/ubuntu/.bashrc
    become_user: ubuntu
    tags:
      - untested
  - name: Load new ROS env
    shell: cd /home/ubuntu/catkin_ws; source /home/ubuntu/.bashrc
    become_user: ubuntu
    args:
      executable: /bin/bash
    tags:
      - untested
  - name: Catkin Make
    shell: cd /home/ubuntu/catkin_ws; catkin_make
    become_user: ubuntu
    tags:
      - untested

如果我在运行playbook之后登录，直到它失败，然后手动运行catkin_make，它工作得很好，我就被难住了。

Answer 1

简短的回答

"/bin/bash: catkin_make:找不到命令“

这是不言而喻的:这意味着当您尝试启动命令时，该命令不在用户的路径中。

更长的答案

我不得不在这里猜测一下，但从我看到的情况来看，我相信当您添加行source /opt/ros/melodic/setup.bash时，catkin_make的路径已经设置在您的.bashrc文件中。如果我是对的，请看下面为什么它不能按照你的方式工作。

但首先，在你的行动手册中有几个错误/糟糕的实践，你应该修复。

1. 您正在shell任务中使用cd XXX，而您应该使用chdir arg，如以下演示任务中所示：

- name: do something in shell
  shell: do_something
  args:
    chdir: /home/my/user

1. 您正在使用shell进行具有现有ansible模块的操作，这些模块更安全且幂等。例如，您可以使用lineinfile将行添加到文件中，或者使用git克隆git repository.
2. You在shell任务中自动获取您的.bashrc，而无需启动任何其他命令。这不会做任何事情。一旦任务完成，所有的东西都会丢失。

从上面的所有恢复，这是我要尝试的。只有这里的最后一个任务真正解决了你的问题(如果我的猜测是正确的话)：

  - name: make Catkin folders
    file:
      path: "/home/ubuntu/catkin_ws/src"
      state: directory
      owner: ubuntu
      group: ubuntu
      mode: '0775'
    tags:
      - untested

  - name: Clone Git into Catkin Folder
    git:
      repo: https://github.com/xxxxx
      dest: /home/ubuntu/catkin_ws/src
    become_user: ubuntu
    tags:
      - untested

  - name: Add bashrc
    lineinfile:
      path: /home/ubuntu/.bashrc
      line: source /opt/ros/melodic/setup.bash
    become_user: ubuntu
    tags:
      - untested

  - name: Catkin Make with env loaded
    shell: |-
      source /home/ubuntu/.bashrc
      catkin_make
    become_user: ubuntu
    args:
      executable: /bin/bash
      chdir: /home/ubuntu/catkin_ws
    tags:
      - untested