Isn't what you are doing mathematically equivalent to:
z = x + (y * iterations)
In which case, why do you need to store each result? Why not just run the
task where you want to use this value using with_sequence, and use this
formula directly?
Such as this contrived example:
- debug: msg="{{ IPOctet + (ServerIPRange//epcrange) * item|int }}"
with_sequence: count="{{ iterations }}"
where IPOctet, ServerIPRange, epcrange, and iterations were defined such as:
vars:
IPOctet: 5
ServerIPRange: 16
epcrange: 2
iterations: 5
On Sat, Aug 23, 2014 at 12:09 PM, Imran Khan <[email protected]>
wrote:
> I posted that code piece of code for explanation purposes only, loop
> iteration i.e. the stop value is not fixed and will vary each time
> depending on user input (it is taken from the user at run time using
> vars_prompt)
>
> Please can you tell me how to do x=x+y with x=10(will change with each
> loop iteration) and y=5 (remains constant), inside a loop that runs ten any
> number of time
>
> On Friday, August 22, 2014 10:27:42 AM UTC-7, Henry Finucane wrote:
>>
>> On Thu, Aug 21, 2014 at 11:17 PM, Imran Khan <[email protected]>
>> wrote:
>> > Thank you for your quick reply:
>> > But this works, but not in a loop!
>> >
>> > - name: bashless math
>> > set_fact:
>> > IPOctet: "{{ (ServerIPRange|int/epcrange|int)+IPOctet|int }}"
>> > with_sequence: start=1 end=4
>> > register: IPOctet
>>
>> You may have missed a crucial bit of what I wrote- your algorithm
>> doesn't actually require any iteration. It decomposes into
>>
>> IPrange/epcrange + (IPrange/epcrange + (IPrange/epcrange +
>> (IPrange/epcrange + LastIPOctet) ) )
>>
>> which is the same thing as
>>
>> 4 * (IPrange/epcrange) + LastIPOctet
>>
>> >
>> > this wont work either:
>> >
>> > - name: bashless math
>> > set_fact:
>> > IPOctet: "{{ (ServerIPRange|int/epcrange|int)+IPOctet|int }}"
>> > register: IPOctet
>> > with_sequence: start=1 end=4
>> > register: my_ip_octet
>> >
>> > I need to save the value in IPOctet repetitively
>> >
>> >
>> > On Thursday, August 21, 2014 10:40:56 PM UTC-7, Henry Finucane wrote:
>> >>
>> >> As an aside, you can do math in Jinja2-
>> >>
>> >> - name: bashless math
>> >> set_fact:
>> >> IPOctet: "{{ 4*(ServerIPRange/epcrange)+IPOctet }}"
>> >>
>> >> will do something approaching what you want.
>> >>
>> >> If you want to get the actual shell-out working, something like this
>> >> is going to be enlightening:
>> >>
>> >> - name: local action math
>> >> local_action: shell echo "{{ServerIPRange}}/{{epcrange}}+{{IPOctet}}"
>>
>> >> | bc
>> >> with_sequence: start=1 end=4
>> >> register: result
>> >> - debug: var=result
>> >>
>> >> "debug: var=result" will dump a pretty-printed JSON structure, so
>> >> you'll know what's available, and what you can use. You should try it
>> >> with & without the with_sequence.
>> >>
>> >>
>> >>
>> >> On Thu, Aug 21, 2014 at 9:47 PM, Imran Khan <[email protected]>
>> wrote:
>> >> > I have 3 variables named IPOctet, ServerIPRange and epcrange. If I
>> >> > perform
>> >> > the following operation in my terminal, it works perfectly
>> >> >
>> >> > IPOctet=$(echo "$ServerIPRange/$epcrange+$IPOctet" | bc)
>> >> >
>> >> > How to I do something similar in a ansible inside a task, for e.g
>> >> >
>> >> > ---
>> >> > - hosts: localhost
>> >> > gather_facts: False
>> >> >
>> >> > vars_prompt:
>> >> > - name: epcrange
>> >> > prompt: Enter the number of EPCs that you want to configure
>> >> > private: False
>> >> > default: "1"
>> >> > - name: serverrange
>> >> > prompt: Enter the number of Cleints that you want to configure
>> >> > private: False
>> >> > defualt: "1"
>> >> > - name: ServerIPRange
>> >> > prompt: Enter the ServerIP range
>> >> > private: False
>> >> > default: '128'
>> >> > - name: LastIPOctet
>> >> > prompt: Enter The last Octet of the IP you just entered
>> >> > private: False
>> >> > default: '10'
>> >> >
>> >> > pre_tasks:
>> >> >
>> >> >
>> >> > - name: Set some facts
>> >> > set_fact:
>> >> > ServerIP1: "{{ServerIP}}"
>> >> > ServerIPRange1: "{{ServerIPRange}}"
>> >> > IPOctet: "{{LastIPOctet}}"
>> >> >
>> >> > - name: local action math
>> >> > local_action: shell {{IPOctet}}=$(echo
>> >> > "${{ServerIPRange}}/${{epcrange}}+${{IPOctet}}" | bc) # Proper
>> Syntax?
>> >> > with_sequence: start=1 end=4
>> >> > register: result
>> >> > ignore_errors: yes
>> >> >
>> >> > What is the proper syntax for this command? Maybe using shell echo
>> >> > "......."
>> >> > . I just need to save the contents of this command into the IPOctet
>> >> > variable
>> >> > and IPOctet will change with each loop iteration and the results
>> should
>> >> > be
>> >> > stored in my result register
>> >> >
>> >> > P.S: how can I access the individual items in the array sepearately?
>> >> >
>> >> > --
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>> >> > To post to this group, send email to [email protected].
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>> >> >
>> >> > https://groups.google.com/d/msgid/ansible-project/
>> 0b34e611-ab2c-45b6-88a9-2caf26ed5504%40googlegroups.com.
>> >> > For more options, visit https://groups.google.com/d/optout.
>> >>
>> >>
>> >>
>> >> --
>> >> -----------------------
>> >> | Henry Finucane
>> >> | "I hear aphorisms are popular"
>> >> -----------------------
>> >
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>> > For more options, visit https://groups.google.com/d/optout.
>>
>>
>>
>> --
>> -----------------------
>> | Henry Finucane
>> | "I hear aphorisms are popular"
>> -----------------------
>>
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--
Matt Martz
[email protected]
http://sivel.net/
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