ansible-collections/community.general
1
0
Fork 0
mirror of https://github.com/ansible-collections/community.general.git synced 2025-07-22 04:40:22 -07:00
Code Issues Projects Releases Packages Wiki Activity Actions 9

Add an 'extract' filter

Browse source 
At its most basic, this is nothing more than an array or hash lookup,
but when used in conjunction with map, it is very useful. For example,
while constructing an "ssh-keyscan …" command to update known_hosts on
all hosts in a group, one can get a list of IP addresses with:

    groups['x']|map('extract', hostvars, 'ec2_ip_address')|list

This returns hostvars[a].ec2_ip_address, hostvars[b].ec2_ip_address, and
so on. You can even specify an array of keys for a recursive lookup, and
mix string and integer keys depending on what you're looking up:

    ['localhost']|map('extract', hostvars, ['vars','group_names',0])|first
        == hostvars['localhost']['vars']['group_names'][0]
            == 'ungrouped'

Includes documentation and tests.
This commit is contained in:
Abhijit Menon-Sen 2015-11-28 20:09:20 +05:30
commit 8cf1815867
3 changed files with 58 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

10
test/integration/roles/test_filters/tasks/main.yml
View file

@ -68,3 +68,13 @@
- '"0.10 GB" == 102400000|human_readable(unit="G")'
- '"0.10 Gb" == 102400000|human_readable(isbits=True, unit="G")'
- name: Container lookups with extract
assert:
that:
- "'x' == [0]|map('extract',['x','y'])|list|first"
- "'y' == [1]|map('extract',['x','y'])|list|first"
- "42 == ['x']|map('extract',{'x':42,'y':31})|list|first"
- "31 == ['x','y']|map('extract',{'x':42,'y':31})|list|last"
- "'local' == ['localhost']|map('extract',hostvars,'ansible_connection')|list|first"
- "'local' == ['localhost']|map('extract',hostvars,['ansible_connection'])|list|first"
- "'ungrouped' == ['localhost']|map('extract',hostvars,['vars','group_names',0])|list|first"