Ansible: Change script value (.sh file) via yml playbook-CodePudding

For example, the relevant part of my playbook looks like this:

tasks:
  - name: test
    script: ../test.sh
    ...

And for my test.sh there is this one line of code that will execute a python script as such:

python run.py --inputvar hello

Is there a way to change the inputvar value within the .sh file from "hello" to something else from the playbook?

Edit: Appreciate @seshadri_c 's help on this. Guess this question shouldve been tagged under shell scripts.

CodePudding user response：

The simplest way to parse arguments in a shell script is using positional arguments - $1, $2, etc.

Given a test.sh script with:

#!/bin/bash

python run.py --inputvar $1

And running it as:

/bin/bash test.sh arg1

will pass the value of $1 to run.py as --inputvar arg1.

Same thing can be run from Ansible task:

tasks:
  - name: test
    script: ../test.sh arg1

CodePudding user response：

There are more options.

The first one might be lineinfile, e.g. the task below is idempotent

    - lineinfile:
        path: test.sh
        regex: '^python run.py --inputvar (.*)$'
        line: 'python run.py --inputvar {{ my_var|default("hello") }}'

gives

TASK [lineinfile] *******************************************************
ok: [localhost]

If you define the variable my_var (See Variable precedence: Where should I put a variable?)

my_var: hello world

The task will change the line in the file. (Running the playbook with options --check --diff)

TASK [lineinfile] ********************************************************
--- before: test.sh (content)
    after: test.sh (content)
@@ -1,3  1,3 @@
 #!/usr/bin/sh
 
-python run.py --inputvar hello
 python run.py --inputvar hello world

changed: [localhost]

The next option might be template, e.g. the template test.sh.j2 and the task below give the same results

shell> cat test.sh.j2
#!/usr/bin/sh

python run.py --inputvar {{ my_var|default("hello") }}

    - template:
        src: test.sh.j2
        dest: test.sh