Hi Werner,
You would want to use the backrefs feature of the lineinfile module. Here
is an example that I use for deleting root password hashes from the
/etc/shadow file. I use regex numbered groups (with parens and \1, etc) to
capture and replay existing parts of lines as needed:
- name: delete root password
lineinfile: 'dest=/etc/shadow
backup=yes
backrefs=yes
regexp="^(root):.*?:(.*)$"
line="\1:*:\2"'
And another example (two tasks) that update an ntp config with a new IP
address:
# The following two tasks will replace existing ntp config from .135 to .133
- name: Fix ntp.conf
lineinfile: dest=/etc/ntp.conf
backup=yes
state=present
backrefs=yes
regexp='^(.*server.*) 192.168.1.135'
line='\1 192.168.1.133'
- lineinfile: dest=/etc/ntp.conf
state=present
backup=yes
backrefs=yes
regexp='^(.*restrict.*) 192.168.1.135'
line='\1 192.168.1.133'
On Wednesday, June 29, 2016 at 1:07:36 AM UTC-5, Werner Flamme wrote:
>
> Hi everyone,
>
> I have one play that does not do what I want it to:
>
> - name: set kernel multiversions
> lineinfile:
> dest: /etc/zypp/zypp.conf
> line: "multiversion.kernels = latest,oldest,running"
> regexp: "multiversion.kernels = latest,latest-1,running"
> state: present
>
> I expect
> -> the module scans for a line matching "regex"
> -> if this is found, the found line is replaced with "line"
> -> if "regex" has no matches, nothing is done
>
> The module instead scans the file, and on the first run it behaves as I
> expect, the line in the file is modified. On subsequent runs, one line
> (per run) is added to the file (before EOF), so that I have multiple
> lines containing "line".
>
> Is this behaviour expected? How can I make a replacement only when
> "regex" matches?
>
> When using a registered variable, this variable is shown as:
>
> ok: [hostname] => {
> "myrole_var1": {
> "backup": "",
> "changed": true,
> "diff": [
> {
> "after": "",
> "after_header": "/etc/zypp/zypp.conf (content)",
> "before": "",
> "before_header": "/etc/zypp/zypp.conf (content)"
> },
> {
> "after_header": "/etc/zypp/zypp.conf (file attributes)",
> "before_header": "/etc/zypp/zypp.conf (file attributes)"
> }
> ],
> "msg": "line added"
> }
> }
>
> So nothing I could use "when" on.
>
> I use the blockinfile module to add a line in this file, but I do not
> see how to use this module to replace one line. This module runs only
> once, on subsequent runs it says "OK" instead of "Changed".
>
> Regards,
> Werner
>
> --
>
>
>
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