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I need to create new variable from contents of other variables. Currently I'm using something like this:
- command: echo "{{ var1 }}-{{ var2 }}-{{ var3 }}"
register: newvar
The problem is:
Usage of {{ var1 }}...{{ varN }} brings too long strings and very ugly code.
Usage of {{ newvar.stdout }} a bit better but confusing.
Usage of set_fact module caches fact between runs. It isn't appropriate for me.
Is there any other solution?
Good question. But I think there is no good answer which fits your criteria. The best I can think of is to use an extra vars file.
A task like this:
- include_vars: concat.yml
And in concat.yml you have your definition:
newvar: "{{ var1 }}-{{ var2 }}-{{ var3 }}"
Since strings are lists of characters in Python, we can concatenate strings the same way we concatenate lists (with the + sign):
{{ var1 + '-' + var2 + '-' + var3 }}
If you want to pipe the resulting string to some filter, make sure you enclose the bits in parentheses:
e.g. To concatenate our 3 vars, and get a sha512 hash:
{{ (var1 + var2 + var3) | hash('sha512') }}
Note: this works on Ansible 2.3. I haven't tested it on earlier versions.
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