Support testing against remote subjects.

It's a severe anti-pattern for a playbook to assume execution always
on a specific host.  The normal/expected pattern is to execute from a
"control host", against an inventory of (possibly-remote) subjects.

This doesn't preclude the inventory from only ever containing
'localhost', it simply means the plays and tasks should not assume
the inventory contents.

This concept is one of the central design-pillars of Ansible's,
and tantamount to it's usefulness and flexibility.  However, in
practice (and by ``integration/readme.md``), plays
specify ``- hosts: all`` but assume inventory_hostname == 'localhost'
(always).

Fix both the playbooks and ``readme.md`` to remove this anti-pattern,
while also allowing the control-host to be the subject-host as needed.
This is accomplished by ensuring low-level Ansible dependencies are
always installed, and writing tasks for steps previously performed
externally (in the CI/automation machinery).

Also update ``readme.md`` to recommend execution occurs through
the ``venv-ansible-playbook.sh`` wrapper to ensure consistent, stable,
version-locked execution dependencies on the control-host.

Remove ``remote_user: root`` from main, since this is better left
to the inventory and command-line.

Signed-off-by: Chris Evich <cevich@redhat.com>

contrib/test/integration/README.md

@@ -1,21 +1,49 @@
 # Fedora and RHEL Integration and End-to-End Tests
 
 This directory contains playbooks to set up for and run the integration and
-end-to-end tests for CRI-O on RHEL and Fedora hosts. Two entrypoints exist:
+end-to-end tests for CRI-O on RHEL and Fedora hosts.  The expected entry-point
+is the ``main.yml`` Ansible playbook.
 
- - `main.yml`: sets up the machine and runs tests
- - `results.yml`: gathers test output to `/tmp/artifacts`
+The control-host:
 
-When running `main.yml`, three tags are present:
+ - May be the subject.
+ - Is based on either RHEL/CentOS 6 (or later), or Fedora 24 (or later).
+ - Runs ``main.yml`` from within the cri-o repository already in the
+   desired state for testing.
 
- - `setup`: run all tasks to set up the system for testing
- - `e2e`: build CRI-O from source and run Kubernetes node E2Es
- - `integration`: build CRI-O from source and run the local integration suite
+The subject host(s):
 
-The playbooks assume the following things about your system:
+ - May be the control-host.
+ - May be executing the ``main.yml`` playbook against itself.
+ - If RHEL-like, has the ``server``, ``extras``, and ``EPEL`` repositories available
+   and enabled.
+ - Has remote password-less ssh configured for direct or sudo access to the root user.
 
- - on RHEL, the server and extras repos are configured and certs are present
- - `ansible` is installed and the host is boot-strapped to allow `ansible` to run against it
- - the `$GOPATH` is set and present for all shells (*e.g.* written in `/etc/environment`)
- - CRI-O is checked out to the correct state at `${GOPATH}/src/github.com/kubernetes-incubator/cri-o`
- - the user running the playbook has access to passwordless `sudo`
+Execution of the ``main.yml`` playbook:
+
+ - Should occur through the ``cri-o/contrib/test/venv-ansible-playbook.sh`` wrapper.
+ - Execution may target localhost, or one or more subjects via standard Ansible
+   inventory arguments.
+ - Should use a combination (including none) of the following tags:
+
+     - ``setup``: Run all tasks to set up the system for testing. Final state must
+                  be self-contained and independent from other tags (i.e. support
+                  stage-caching).
+     - ``integration``: Assumes 'setup' previously completed successfully.
+                        May be executed from cached-state of ``setup``.
+                        Not required to execute conicident with other tags.
+                        Must build CRI-O from source and run the
+                        integration test suite.
+     - ``e2e``: Assumes 'setup' previously completed successfully.  May be executed
+                from cached-state of ``setup``. Not required to execute conicident with
+                other tags.  Must build CRI-O from source and run Kubernetes node
+                E2E tests.
+
+``cri-o/contrib/test/venv-ansible-playbook.sh`` Wrapper:
+
+ - Must accepts all of the valid Ansible command-line options.
+ - Must use version-locked & hashed dependencies as written in ``requirements.txt``.
+ - Must fully sandbox it's own execution environment except for the following
+   required packages (or equivalent): ``python2-virtualenv gcc openssl-devel
+   redhat-rpm-config libffi-devel python-devel libselinux-python rsync
+   yum-utils python3-pycurl python-simplejson``.

contrib/test/integration/build/cri-o.yml

@@ -1,42 +1,42 @@
 ---
 
-- name: stat the expected cri-o directory
+- name: stat the expected cri-o directory and Makefile exists
   stat:
-    path: "{{ ansible_env.GOPATH }}/src/github.com/kubernetes-incubator/cri-o"
+    path: "{{ cri_o_dest_path }}/Makefile"
   register: dir_stat
 
-- name: expect cri-o to be cloned already
+- name: Verify cri-o Makefile exists in expected location
   fail:
-    msg: "Expected cri-o to be cloned at {{ ansible_env.GOPATH }}/src/github.com/kubernetes-incubator/cri-o but it wasn't!"
-  when: not dir_stat.stat.exists
+    msg: "Expected cri-o to be cloned at {{ cri_o_dest_path }} but it wasn't!"
+  when: not dir_stat.stat.exists or not dir_stat.stat.isreg
 
 - name: install cri-o tools
   make:
     target: install.tools
-    chdir: "{{ ansible_env.GOPATH }}/src/github.com/kubernetes-incubator/cri-o"
+    chdir: "{{ cri_o_dest_path }}"
 
 - name: build cri-o
   make:
-    chdir: "{{ ansible_env.GOPATH }}/src/github.com/kubernetes-incubator/cri-o"
+    chdir: "{{ cri_o_dest_path }}"
 
 - name: install cri-o
   make:
     target: install
-    chdir: "{{ ansible_env.GOPATH }}/src/github.com/kubernetes-incubator/cri-o"
+    chdir: "{{ cri_o_dest_path }}"
 
 - name: install cri-o systemd files
   make:
     target: install.systemd
-    chdir: "{{ ansible_env.GOPATH }}/src/github.com/kubernetes-incubator/cri-o"
+    chdir: "{{ cri_o_dest_path }}"
 
 - name: install cri-o config
   make:
     target: install.config
-    chdir: "{{ ansible_env.GOPATH }}/src/github.com/kubernetes-incubator/cri-o"
+    chdir: "{{ cri_o_dest_path }}"
 
 - name: install configs
   copy:
-    src: "{{ ansible_env.GOPATH }}/src/github.com/kubernetes-incubator/cri-o/{{ item.src }}"
+    src: "{{ cri_o_dest_path }}/{{ item.src }}"
     dest: "{{ item.dest }}"
     remote_src: yes
   with_items:

contrib/test/integration/github.yml

@@ -0,0 +1,27 @@
+---
+
+
+- name: Verify expectations
+  assert:
+    that:
+      - 'cri_o_dest_path is defined'
+      - 'cri_o_src_path is defined'
+
+- name: The cri-o repository directory exists
+  file:
+    path: "{{ cri_o_dest_path }}"
+    state: directory
+    mode: 0777
+
+- name: Synchronize cri-o from control-host to remote subject
+  synchronize:
+    archive: False
+    checksum: True
+    delete: True
+    dest: "{{ cri_o_dest_path }}/"
+    links: True
+    recursive: True
+    src: "{{ cri_o_src_path }}/"
+    times: True
+  # This task is excessively noisy, logging every change to every file :(
+  no_log: True

contrib/test/integration/main.yml

@@ -1,5 +1,27 @@
-- hosts: all
-  remote_user: root
+---
+
+- hosts: '{{ subjects | default("all") }}'
+  gather_facts: False  # Requires low-level ansible-dependencies
+  tasks:
+    - name: Ensure low-level ansible-dependencies are installed
+      raw: $(type -P dnf || type -P yum) install -y python2 python2-dnf libselinux-python git rsync
+
+    - name: Gather only networking facts for speed
+      setup:
+        gather_subset: network
+
+
+- hosts: '{{ subjects | default("none") }}'
+  vars_files:
+    - "{{ playbook_dir }}/vars.yml"
+  tags:
+    - setup
+  tasks:
+    - name: CRI-O source is available on every subject
+      include: github.yml
+
+
+- hosts: '{{ subjects | default("all") }}'
   vars_files:
     - "{{ playbook_dir }}/vars.yml"
   tags:
@@ -26,19 +48,18 @@
     - name: clone build and install networking plugins
       include: "build/plugins.yml"
 
-- hosts: all
-  remote_user: root
+
+- hosts: '{{ subjects | default("all") }}'
   vars_files:
     - "{{ playbook_dir }}/vars.yml"
   tags:
     - integration
     - e2e
   tasks:
-    - name: clone build and install cri-o
+    - name: Build and install cri-o
       include: "build/cri-o.yml"
 
-- hosts: all
-  remote_user: root
+- hosts: '{{ subjects | default("all") }}'
   vars_files:
     - "{{ playbook_dir }}/vars.yml"
   tags:
@@ -47,8 +68,7 @@
     - name: run cri-o integration tests
       include: test.yml
 
-- hosts: all
-  remote_user: root
+- hosts: '{{ subjects | default("all") }}'
   vars_files:
     - "{{ playbook_dir }}/vars.yml"
   tags:

contrib/test/integration/results.yml

@@ -1,7 +1,7 @@
 ---
 # vim-syntax: ansible
 
-- hosts: '{{ hosts | default("all") }}'
+- hosts: '{{ subjects | default("all") }}'
   vars_files:
     - "{{ playbook_dir }}/vars.yml"
   vars:

contrib/test/integration/system.yml

@@ -70,6 +70,7 @@
     state: present
   with_items:
    - btrfs-progs-devel
+   - python2-virtualenv
   when: ansible_distribution in ['Fedora']
 
 - name: Check / setup swap
@@ -110,3 +111,17 @@
 - name: Update the kernel cmdline to include quota support
   command: grubby --update-kernel=ALL --args="rootflags=pquota"
   when: ansible_distribution in ['RedHat', 'CentOS']
+
+- name: Configure the GOPATH environment variable for all users
+  blockinfile:
+    path: /etc/environment
+    block: "GOPATH={{ go_path }}"
+    create: True
+    follow: True
+
+- name: Reset the ansible connection to incorporate /etc/environment changes
+  meta: reset_connection
+
+- name: Refresh facts to incorporate /etc/environment changes
+  setup:
+    gather_subset: network

contrib/test/integration/test.yml

@@ -15,7 +15,7 @@
     extra_storage_opts: " --storage-opt overlay.override_kernel_check=1"
   when: ansible_distribution == 'RedHat' or ansible_distribution == 'CentOS'
 
-- name: ensure directory exists for e2e reports
+- name: ensure directory exists for integration results
   file:
     path: "{{ artifacts }}"
     state: directory
@@ -31,9 +31,9 @@
       when: not integration_selinux_enabled
 
     - name: run integration tests
-      shell: "CGROUP_MANAGER=cgroupfs STORAGE_OPTIONS='--storage-driver=overlay{{ extra_storage_opts | default('') }}' make localintegration >& {{ artifacts }}/testout.txt"
+      shell: "CGROUP_MANAGER=cgroupfs STORAGE_OPTS='--storage-driver=overlay{{ extra_storage_opts | default('') }}' make localintegration >& {{ artifacts }}/testout.txt"
       args:
-        chdir: "{{ ansible_env.GOPATH }}/src/github.com/kubernetes-incubator/cri-o"
+        chdir: "{{ cri_o_dest_path }}"
       async: 5400
       poll: 30
 

contrib/test/integration/vars.yml

@@ -13,6 +13,15 @@ e2e_swap_enabled: True
 integration_selinux_enabled: True
 e2e_selinux_enabled: False
 
+# Path to encode into /etc/environment on all hosts
+go_path: "/go"
+
+# Absolute path on control-host where the cri-o source exists
+cri_o_src_path: "{{ playbook_dir }}/../../../"
+
+# Absolute path on subjects where cri-o source is expected
+cri_o_dest_path: "{{ go_path }}/src/github.com/kubernetes-incubator/cri-o"
+
 # For results.yml Paths use rsync 'source' conventions
 artifacts: "/tmp/artifacts"  # Base-directory for collection
 crio_integration_filepath: "{{ artifacts }}/testout.txt"