insert files lines into another depending regex filter in Ansible-CodePudding

I would copy lines from a file /tmp/test1 to a file /tmp/test2 the /tmp/test1 contains:

  : argument1 : ALL
  : argument2 : ALL
  : @test1 : ALL
  : @test2 : ALL
  : @test3 : ALL

the /tmp/test2 contains:

  : argument1.1 : ALL
  : argument2192 : ALL
  : @example : ALL
  : @test2 : ALL
  : @example1 : ALL

So my main goal is to insert every line that doesn't exist in /tmp/test2 from file /tmp/test1 and that the line added must be added at the end of the last line which is containing the same beginning after : : ^[[:alpha:]] and ^@, so /tmp/test2 should look like this:

  : argument1.1  : ALL
  : argument2192 : ALL
  : argument1 : ALL
  : argument2 : ALL
  : @example : ALL
  : @test2 : ALL
  : @example1 : ALL
  : @test1 : ALL
  : @test3 : ALL

I got a reply about how to merge the 2 files from this answer Vladimir Botka_answer. But what is causing an issue for me is the : : at the begining of each <line>, the filter must be applied after that if it starts with @ or alpha

CodePudding user response：

Put prefix and regex into variables and test the first 5 characters. For example,

    - name: insert line
      lineinfile:
        path: /tmp/test2
        line: "{{ item }}"
        insertafter: "{{ (item[0:5] == prefix)|ternary('EOF', omit) }}"
        insertbefore: "{{ (item[0:5] != prefix)|ternary(regex, omit) }}"
        firstmatch: true
      loop: "{{ tmp_content.stdout_lines }}"
      vars:
        prefix: '  : @'
        regex: '^\  \: @.*$'

gives

shell> cat /tmp/test2
  : argument1.1 : ALL
  : argument2192 : ALL
  : argument1 : ALL
  : argument2 : ALL
  : @example : ALL
  : @test2 : ALL
  : @example1 : ALL
  : @test1 : ALL
  : @test3 : ALL

^{Example of a complete playbook for testing

- hosts: localhost
tasks:
- name: check test1 content
command: cat /tmp/test1
register: tmp_content
changed_when: false
- name: insert line
lineinfile:
path: /tmp/test2
line: "{{ item }}"
insertafter: "{{ (item[0:5] == prefix)|ternary('EOF', omit) }}"
insertbefore: "{{ (item[0:5] != prefix)|ternary(regex, omit) }}"
firstmatch: true
loop: "{{ tmp_content.stdout_lines }}"
vars:
prefix: ' : @'
regex: '^\ \: @.*$'

The playbook is idempotent. See the output of the diff_mode below

shell> ansible-playbook pb.yml --diff
...
TASK [insert line] ****************************************
--- before: /tmp/test2 (content)
after: /tmp/test2 (content)
@@ -1,5 1,6 @@
: argument1.1 : ALL
: argument2192 : ALL
: argument1 : ALL
: @example : ALL
: @test2 : ALL
: @example1 : ALL

changed: [localhost] => (item= : argument1 : ALL)
--- before: /tmp/test2 (content)
after: /tmp/test2 (content)
@@ -1,6 1,7 @@
: argument1.1 : ALL
: argument2192 : ALL
: argument1 : ALL
: argument2 : ALL
: @example : ALL
: @test2 : ALL
: @example1 : ALL

changed: [localhost] => (item= : argument2 : ALL)
--- before: /tmp/test2 (content)
after: /tmp/test2 (content)
@@ -5,3 5,4 @@
: @example : ALL
: @test2 : ALL
: @example1 : ALL
: @test1 : ALL

changed: [localhost] => (item= : @test1 : ALL)
ok: [localhost] => (item= : @test2 : ALL)
--- before: /tmp/test2 (content)
after: /tmp/test2 (content)
@@ -6,3 6,4 @@
: @test2 : ALL
: @example1 : ALL
: @test1 : ALL
: @test3 : ALL

changed: [localhost] => (item= : @test3 : ALL)

Q: " Add the lines containing @ behind the last match line containing @."
A: Use regex both in insertafter and insertbefore, and select firstmatch according the prefix. Technically, append @ lines to the @ block and prepend others. For example, given the file
shell> cat /tmp/test2
: argument1.1 : ALL
: argument2192 : ALL
: @example : ALL
: @test2 : ALL
: @example1 : ALL
: <rubish>

The task below does the job
- name: insert line
lineinfile:
path: /tmp/test2
line: "{{ item }}"
insertafter: "{{ (item[0:5] == prefix)|ternary(regex, omit) }}"
insertbefore: "{{ (item[0:5] != prefix)|ternary(regex, omit) }}"
firstmatch: "{{ (item[0:5] != prefix)|ternary(true, false) }}"
loop: "{{ tmp_content.stdout_lines }}"
vars:
prefix: ' : @'
regex: '^\ \: @.*$'

See the output of the diff_mode below
shell> ansible-playbook pb.yml --diff
...
TASK [insert line] ******************************************
--- before: /tmp/test2 (content)
after: /tmp/test2 (content)
@@ -1,5 1,6 @@
: argument1.1 : ALL
: argument2192 : ALL
: argument1 : ALL
: @example : ALL
: @test2 : ALL
: @example1 : ALL

changed: [localhost] => (item= : argument1 : ALL)
--- before: /tmp/test2 (content)
after: /tmp/test2 (content)
@@ -1,6 1,7 @@
: argument1.1 : ALL
: argument2192 : ALL
: argument1 : ALL
: argument2 : ALL
: @example : ALL
: @test2 : ALL
: @example1 : ALL

changed: [localhost] => (item= : argument2 : ALL)
--- before: /tmp/test2 (content)
after: /tmp/test2 (content)
@@ -5,4 5,5 @@
: @example : ALL
: @test2 : ALL
: @example1 : ALL
: @test1 : ALL
: <rubish>

changed: [localhost] => (item= : @test1 : ALL)
ok: [localhost] => (item= : @test2 : ALL)
--- before: /tmp/test2 (content)
after: /tmp/test2 (content)
@@ -6,4 6,5 @@
: @test2 : ALL
: @example1 : ALL
: @test1 : ALL
: @test3 : ALL
: <rubish>

changed: [localhost] => (item= : @test3 : ALL)}