Add ability to mount volumes into system container nodes

This commit adds the ability to mount volumes into
system containerized nodes.

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1534933

3 files changed, 45 insertions, 0 deletions

diff --git a/roles/lib_utils/filter_plugins/oo_filters.py b/roles/lib_utils/filter_plugins/oo_filters.py
index 9f73510c4..ef996fefe 100644
--- a/roles/lib_utils/filter_plugins/oo_filters.py
+++ b/roles/lib_utils/filter_plugins/oo_filters.py
@@ -4,6 +4,7 @@
 """
 Custom filters for use in openshift-ansible
 """
+import json
 import os
 import pdb
 import random
@@ -586,6 +587,18 @@ that result to this filter plugin.
     return secret_name
 
 
+def lib_utils_oo_l_of_d_to_csv(input_list):
+    """Map a list of dictionaries, input_list, into a csv string
+    of json values.
+
+    Example input:
+    [{'var1': 'val1', 'var2': 'val2'}, {'var1': 'val3', 'var2': 'val4'}]
+    Example output:
+    u'{"var1": "val1", "var2": "val2"},{"var1": "val3", "var2": "val4"}'
+    """
+    return ','.join(json.dumps(x) for x in input_list)
+
+
 def map_from_pairs(source, delim="="):
     ''' Returns a dict given the source and delim delimited '''
     if source == '':
@@ -623,5 +636,6 @@ class FilterModule(object):
             "lib_utils_oo_contains_rule": lib_utils_oo_contains_rule,
             "lib_utils_oo_selector_to_string_list": lib_utils_oo_selector_to_string_list,
             "lib_utils_oo_filter_sa_secrets": lib_utils_oo_filter_sa_secrets,
+            "lib_utils_oo_l_of_d_to_csv": lib_utils_oo_l_of_d_to_csv,
             "map_from_pairs": map_from_pairs
         }
diff --git a/roles/openshift_node/defaults/main.yml b/roles/openshift_node/defaults/main.yml
index c1fab4382..5d33e1323 100644
--- a/roles/openshift_node/defaults/main.yml
+++ b/roles/openshift_node/defaults/main.yml
@@ -71,6 +71,18 @@ r_openshift_node_use_firewalld: "{{ os_firewall_use_firewalld | default(False) }
 
 l_is_node_system_container: "{{ (openshift_use_node_system_container | default(openshift_use_system_containers | default(false)) | bool) }}"
 
+openshift_node_syscon_auth_mounts_l:
+- type: bind
+  source: "{{ oreg_auth_credentials_path }}"
+  destination: "/root/.docker"
+  options:
+  - ro
+
+# If we need to add new mounts in the future, or the user wants to mount data.
+# This should be in the same format as auth_mounts_l above.
+openshift_node_syscon_add_mounts_l: []
+
+
 openshift_deployment_type: "{{ openshift_deployment_type | default('origin') }}"
 
 openshift_node_image_dict:
diff --git a/roles/openshift_node/tasks/node_system_container.yml b/roles/openshift_node/tasks/node_system_container.yml
index 06b879050..008f209d7 100644
--- a/roles/openshift_node/tasks/node_system_container.yml
+++ b/roles/openshift_node/tasks/node_system_container.yml
@@ -14,4 +14,23 @@
     - "DNS_DOMAIN={{ openshift.common.dns_domain }}"
     - "DOCKER_SERVICE={{ openshift_docker_service_name }}.service"
     - "MASTER_SERVICE={{ openshift_service_type }}.service"
+    - 'ADDTL_MOUNTS={{ l_node_syscon_add_mounts2 }}'
     state: latest
+  vars:
+    # We need to evaluate some variables here to ensure
+    # l_bind_docker_reg_auth is evaluated after registry_auth.yml has been
+    # processed.
+
+    # Determine if we want to include auth credentials mount.
+    l_node_syscon_auth_mounts_l: "{{ l_bind_docker_reg_auth | ternary(openshift_node_syscon_auth_mounts_l,[]) }}"
+
+    # Join any user-provided mounts and auth_mounts into a combined list.
+    l_node_syscon_add_mounts_l: "{{ openshift_node_syscon_add_mounts_l | union(l_node_syscon_auth_mounts_l) }}"
+
+    # We must prepend a ',' here to ensure the value is inserted properly into an
+    # existing json list in the container's config.json
+    # lib_utils_oo_l_of_d_to_csv is a custom filter plugin in roles/lib_utils/oo_filters.py
+    l_node_syscon_add_mounts: ",{{ l_node_syscon_add_mounts_l | lib_utils_oo_l_of_d_to_csv }}"
+    # if we have just a ',' then both mount lists were empty, we don't want to add
+    # anything to config.json
+    l_node_syscon_add_mounts2: "{{ (l_node_syscon_add_mounts != ',') | bool | ternary(l_node_syscon_add_mounts,'') }}"