How to get an arbitrary remote user's home dir

问题:

I can do that with shell using combination of getent and awk like this:

getent passwd $user | awk -F: '{ print $6 }'

For the reference, in Puppet I can use a custom fact, like this:

require 'etc'

Etc.passwd { |user|

   Facter.add("home_#{user.name}") do
      setcode do
         user.dir
      end
   end

}

which makes the user's home directory available as a home_<user name> fact.

How do I get the home directory of an arbitrary remote user?

回答1:

Ansible (from 1.4 onwards) already reveals environment variables for the user under the ansible_env variable.

- hosts: all
  tasks:
    - name: debug through ansible.env
      debug: var=ansible_env.HOME

Alternatively, you can access environment variables using a lookup on env:

- hosts: all
  tasks:
    - name: debug through lookup on env
      debug: var=lookup('env','HOME')

Unfortunately you can apparently only use this to get environment variables for the connected user as this playbook and output shows:

- hosts: all
  tasks:
    - name: debug specified user's home dir through ansible.env
      debug: var=ansible_env.HOME
      become: true
      become_user: "{{ user }}"

    - name: debug specified user's home dir through lookup on env
      debug: var=lookup('env','HOME')
      become: true
      become_user: "{{ user }}"

OUTPUT:

vagrant@Test-01:~$ ansible-playbook -i "inventory/vagrant" env_vars.yml -e "user=testuser"

PLAY [all] ********************************************************************

GATHERING FACTS ***************************************************************
ok: [192.168.0.30]

TASK: [debug specified user's home dir through ansible.env] *******************
ok: [192.168.0.30] => {
    "var": {
        "/home/vagrant": "/home/vagrant"
    }
}

TASK: [debug specified user's home dir through lookup on env] *****************
ok: [192.168.0.30] => {
    "var": {
        "/home/vagrant": "/home/vagrant"
    }
}

PLAY RECAP ********************************************************************
192.168.0.30               : ok=3    changed=0    unreachable=0    failed=0

As with anything in Ansible, if you can't get a module to give you what you want then you are always free to shell out (although this should be used sparingly as it may be fragile and will be less descriptive) using something like this:

- hosts: all
  tasks:
    - name: grep and register
      shell: >
              egrep "^{{ user }}:" /etc/passwd | awk -F: '{ print $6 }'
      changed_when: false
      register: user_home

    - name: debug output
      debug: var=user_home.stdout

There may well be a cleaner way of doing this and I'm a little surprised that using become_user to switch to the user specified doesn't seem to affect the env lookup but this should give you what you want.

回答2:

The Problem

The lookup() or ENV var methods for finding an arbitrary user's home sadly won't work reliably with Ansible because it runs as the user specified with --user=REMOTE_USER, and optionally with sudo (if sudo: yes in playbook or --sudo passed). These two run modes (sudo or no sudo) will change the shell environment that Ansible is running within, and even then you will be limited to the user specified as -u REMOTE_USER or root.

You could try to use sudo: yes, and sudo_user: myarbitraryuser together... however due to a bug in certain versions of Ansible you may see that it does not behave as it should. If you are on Ansible >= 1.9, you can use become: true, and become_user: myarbitraryuser instead. However, this means that the playbooks and roles you write will not work on previous versions of Ansible.

If you are looking for a portable way to get a user's home dir that also will work with LDAP or some other directory service, use getent.

Ansible getent Example

Create a simple playbook named: playbooks/ad-hoc/get-user-homedir.yml

- hosts: all
  tasks:
    - name:
      shell: >
        getent passwd {{ user }} | cut -d: -f6
      changed_when: false
      register: user_home

    - name: debug output
      debug: var=user_home.stdout

Run it with:

ansible-playbook -i inventory/racktables.py playbooks/ad-hoc/get-user-homedir.yml -e "user=someuser"

回答3:

Ansible 1.8 introduced the getent module. It registers the getent result as a host fact—in this case, it's getent_passwd.

examples:

Print the home folder for a given user:

---

- getent:
    database: passwd
    key: "{{ user }}"
    split: ":"

- debug:
    msg: "{{ getent_passwd[user][4] }}"

Accumulate a lookup table (user_homes), leveraging set_fact and the Jinja2 combine() filter:

---

- assert:
    that:
      - user_name is defined

- when: user_homes is undefined or user_name not in user_homes
  block:
    - name: getent
      become: yes
      getent:
        database: passwd
        key: "{{ user_name }}"
        split: ":"

    - name: set fact
      set_fact:
        "user_homes": "{{ user_homes | d({}) | combine({user_name: getent_passwd[user_name][4]}) }}"

Would be better with a custom fact module though.

回答4:

I think there are several answers given here that would work, but I thought I'd show that you can get this from the ansible user module, by registering it as a variable.

- user:
    name: www-data
    state: present
  register: webserver_user_registered

Note: it will create the user if it doesn't exist...

So we can use debug to show the values of that var, including the path...

- debug:
    var: webserver_user_registered

TASK [wordpress : debug] ******************
ok: [wordpresssite.org] => {
    "webserver_user_registered": {
        "append": false,
        "changed": false,
        "comment": "www-data",
        "failed": false,
        "group": 33,
        "home": "/var/www",      <<------ this is the user home dir
        "move_home": false,
        "name": "www-data",
        "shell": "/usr/sbin/nologin",
        "state": "present",
        "uid": 33
    }
}

And you can use those properties in other modules like this;

- file:
    name: "{{ webserver_user_registered.home }}/.wp-cli"
    state: directory

回答5:

Every answer mentions about how to print the home directory details while running the playbook and displaying it on screen using debug and var.

Adapting to @TrinitronX answer

An additional information on using this information to a new task.

I have a list of users whose home directory needs to be extracted. So I have added the user details to a list

- name: Get home directory
  shell: >
         getent passwd {{ item.user }} | cut -d: -f6
  changed_when: false
  with_items:
   - "{{java}}"
  register: user_home

Here this step will loop through all user list and will register that details to user_home. And this will be in the form of an array.

Then next step is to use this information to a new task, which is say for example sourcing a file into bash profile. This is just an example and can be any scenario, but method will remain the same.

- name: Set Java home in .bash_profile
  lineinfile: path="{{ item.stdout }}/.bash_profile" regexp='^source "{{ java_dir }}/.bash_profile_java"' line='source "{{ java_dir }}/.bash_profile_java"' state=present
  with_items:
   - "{{ user_home.results }}"
  loop_control:
    label: "{{ item.stdout }}"

I have set a fact for java_dir to /usr/java/latest in the same playbook.

Array user_home.results will contain the details of the Get home directory task. Now we loop through this array and take out the stdout value which contains the home directory path.

I have put loop_control for printing the home directory only, else it will print the entire array.

By this process, we can ensure that if n number of users are there, we can follow this method and all will be taken care.

Note: I have started to learn the Ansible, in case if any terminology I have used is wrong, please excuse. I have spend some time for figuring out on how to do this and thought of sharing the same.

回答6:

There is no easy way to do this in Ansible at this moment and that's why you should add your votes to this issue

https://github.com/ansible/ansible/issues/15901

While you can use this workaround: https://stackoverflow.com/a/33343455/99834 you should not forget to send the feedback that you want this to be easy to be used.

回答7:

You can use expanduser.

For instance, while looping over a user list:

- name: Deploys .bashrc
  template:
    src: bashrc.j2
    dest: "{{ '~' + item | expanduser }}/.bashrc"
    mode: 0640
    owner: "{{ item }}"
    group: "{{ item }}"
  with_items: user_list

回答8:

I know this is quite old thread, but I think this is a bit simpler way for getting the users home directory

- name: Get users homedir
  local_action: command echo ~
  register: homedir

On Linux (or Unix) systems the tilde-sign points to the users home directory.