Can lineinfile insert text into a line?

[John Oliver]

Example:

password    sufficient    pam_unix.so shadow nullok try_first_pass use_authtok

And I want to wind up with:

password    sufficient    pam_unix.so sha512 shadow nullok try_first_pass use_authtok

And let's assume I don't know what might come after pam_unix.so, and want to preserve whatever's there, and so can't just use line="string of text"

Right now, I'd use 'command' or 'shell' to call sed or awk to accomplish this.  But is there a way to massage ansible into doing this?

[Berend de Boer]

lineinfile replaces the entire line. But I think you can use regexp back references to copy text from the match into your line.

[Paul Tötterman]

Right now, I'd use 'command' or 'shell' to call sed or awk to accomplish this.  But is there a way to massage ansible into doing this?

Augeas could probably be used (<http://augeas.net/docs/references/lenses/files/pam-aug.html>), but I guess there's no ansible module for augeas yet.

Cheers,

Paul

[Marc Patermann]

John,

The second last example for lineinfile does use regex with a backreference:
http://docs.ansible.com/lineinfile_module.html
"- lineinfile: dest=/opt/jboss-as/bin/standalone.conf
regexp='^(.*)Xms(\d+)m(.*)$' line='\1Xms${xms}m\3' backrefs=yes"

For a start something like:
regex='^password sufficient pam_unix.so (.*)' line='password
sufficient pam_unix.so sha512 \1' backrefs=yes

You may have to take care \1 does not contain "sha512", so .* may not be
safe enough.


Marc

[Michael DeHaan]

No, you don't want this.

The error handling in aug is atrocious, as is writing lenses for it.   Never going to happen in ansible :)

lineinfile was designed to make it easier, and it's also why we have things like the INI module.

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