CODEWITHSUNDEEP
ansibleansible-2.x
SSN
SSN

Reputation: 886

Check only string using ansible

I want to check only string, not whole line. For example, my line is like this

"pwd requisite dcredit=-5 ucredit=-1 lcredit=-1 ocredit=-1 minlen=14 difok=4 retry=2"

I have to check lcredit=-1 this string

Condition is :

  1. If this string is same like this lcredit=-1 we skip this

  2. If the string lcredit=2 not in -1 then here we have to change -1

  3. If the string is not there have to add the string end of the line.

and one more lcredit=-1 contain any of the position in that particular line.

If I am using lineinfile it would be change whole line and the line string position is different. If I am using replace, it would only be replaced, but if not there it will not add. So any other function to satisfy my condition?

Upvotes: 1

Views: 355

Answers (1)

Antonis Christofides
Antonis Christofides

Reputation: 6939

One way is to use regular expressions (untested):

- name: If lcredit is specified, make sure it is -1
  lineinfile:
    regexp: "^pwd requisite(.*) lcredit=(-?\d+)(.*)"
    backrefs: yes
    line: 'pwd requisite\1 lcredit=-1\2'
    dest: /etc/pam.d/whatever

- name: If lcredit not specified, add it
  lineinfile:
    regexp: "^pwd requisite((?!.* lcredit=.*).*)"
    backrefs: yes
    line: 'pwd requisite\1 lcredit=-1'
    dest: /etc/pam.d/whatever

Usually I try to avoid regular expressions, especially complicated ones like the above. If you don't already know them it often doesn't pay to invest in learning them. So what I would do would be to try to find a way to work around the problem. For example, would it work to always specify the whole exact line, rather than try to be clever with moving its parts around?

Upvotes: 1

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