root of hg tree?

[Roy Smith]

I want to set a playbook variable to the root of my hg tree, i.e. capture the output of the "hg root" command run on my local host.  How do I do that?

[J Hawkesworth]

'register' and perhaps 'set_fact' are probably what you need - here's an example:

$ cat set_fact.yml
---
- hosts: linux
  tasks:
  - name: call a command to get some output...
    command: "echo somecomandoutput"
    delegate_to: localhost
    register: result

# debug statements very handy for seeing what's in your registered variables.
  - debug: var=result


# now use set_fact to put the var into a fact.
  - name: set fact based on output of previous command
    set_fact:
      my_hg_root: "{{result.stdout_lines[0]}}"

# debug just to show the value is now in the fact
  - debug: var=my_hg_root