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Add an 'extract' filter

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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
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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"