By switching to block style (`|`) with clip (no `-` or `+`) the failure
messages don't require quoting and gain a single trailing newline. This causes
Ansible to print them as block style, when using the yaml stdout callback
plugin. As a result the values have one less layer of quoting and quote
escaping, making them much easier to read.
The OpenShift installer modifies /etc/resolv.conf then tests the new
resolver configuration, however, there was no mechanism to reload
resolv.conf in our reuseable interpreter.
https://github.com/openshift/openshift-ansible/blob/release-3.9/roles/openshift_web_console/tasks/install.yml#L137
This inserts an explicit call to res_init() for every new style
invocation, with an approximate cost of ~1usec on Linux since glibc
verifies resolv.conf has changed before reloading it.
There is little to be done for users of the thread-safe resolver APIs,
their state is hidden from us. If bugs like that manifest, whack-a-mole
style 'del sys.modules[thatmod]' patches may suffice.
Alex Willmer