Ansible Command module says that '|' is illegal character

I am using Ansible to deploy my project and I trying to check if an specified package is installed, but I have a problem with it task, here is the task:

- name: Check if python-apt is installed
command: dpkg -l | grep python-apt
register: python_apt_installed
ignore_errors: True

And here is the problem:

$ ansible-playbook -i hosts idempotent.yml


PLAY [lxc-host] ***************************************************************


GATHERING FACTS ***************************************************************
ok: [10.0.3.240]


TASK: [idempotent | Check if python-apt is installed] *************************
failed: [10.0.3.240] => {"changed": true, "cmd": ["dpkg", "-l", "|", "grep", "python-apt"], "delta": "0:00:00.015524", "end": "2014-07-10 14:41:35.207971", "rc": 2, "start": "2014-07-10 14:41:35.192447"}
stderr: dpkg-query: error: package name in specifier '|' is illegal: must start with an alphanumeric character
...ignoring


PLAY RECAP ********************************************************************
10.0.3.240                 : ok=2    changed=1    unreachable=0    failed=0

Why is illegal this character '|' .

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最佳答案

From the doc:

command - Executes a command on a remote node

The command module takes the command name followed by a list of space-delimited arguments. The given command will be executed on all selected nodes. It will not be processed through the shell, so variables like $HOME and operations like "<", ">", "|", and "&" will not work (use the shell module if you need these features).

shell - Executes a commands in nodes

The shell module takes the command name followed by a list of space-delimited arguments. It is almost exactly like the command module but runs the command through a shell (/bin/sh) on the remote node.

Therefore you have to use shell: dpkg -l | grep python-apt.

小开

read about the command module in the Ansible documentation:

It will not be processed through the shell, so .. operations like "<", ">", "|", and "&" will not work

As it recommends, use the shell module:

- name: Check if python-apt is installed
shell: dpkg -l | grep python-apt
register: python_apt_installed
ignore_errors: True

For what it's worth, you can check/confirm the installation in a debian environment using the apt command:

- name: ensure python-apt is installed
apt: name=python-apt state=present