Created attachment 1521431 [details]
value "get_gateway" is undefined

Description of problem:
Hosted engine deploys failed with static IPv6 network. After all of the settings input, when it run task "Get default gateway" in validate_gateway.yml,
failed as value "get_gateway" is undefined.

2019-01-18 12:33:57,678+0800 ERROR otopi.ovirt_hosted_engine_setup.ansible_utils ansible_utils._process_output:98 fatal: [localhost]: FAILED! => {"msg": "The task 
includes an option with an undefined variable. The error was: list object has no element 0\n\nThe error appears to have been in 
'/usr/share/ansible/roles/oVirt.hosted-engine-setup/tasks/pre_checks/validate_gateway.yml': line 9, column 5, but may\nbe elsewhere in the file depending on the 
exact syntax problem.\n\nThe offending line appears to be:\n\n  - debug: var=get_gateway\n  - name: Set he_gateway\n    ^ here\n"}

After check the code in the yml file, the shell command #5 "ip r|grep default| awk '{print $3}' is for ipv4, so this is the root cause.


Version-Release number of selected component (if applicable):
RHVH-4.3-20190115.0-RHVH-x86_64-dvd1.iso
cockpit-176-4.el7.x86_64
cockpit-machines-ovirt-176-4.el7.noarch
cockpit-bridge-176-4.el7.x86_64
cockpit-storaged-176-4.el7.noarch
cockpit-ovirt-dashboard-0.12.0-1.el7ev.noarch
cockpit-dashboard-176-4.el7.x86_64
cockpit-system-176-4.el7.noarch
cockpit-ws-176-4.el7.x86_64
ovirt-hosted-engine-ha-2.3.0-1.el7ev.noarch
ovirt-hosted-engine-setup-2.3.2-1.el7ev.noarch
rhvm-appliance-4.3-20190115.0.el7.x86_64


How reproducible:
100%

Steps to Reproduce:
1. Clean install RHVH-4.3-20190115.0-RHVH-x86_64-dvd1.iso
2. Configure the host with static IPv6 network
3. Deploy Hosted-engine with CLI
    #hosted-engine --deploy

Actual results:
Hosted engine deploys failed with static IPv6 network as value "get_gateway" is undefined.

Expected results:
Hosted engine deployed with static IPv6 network should be successful without error.

Additional info: