Add pre-upgrade task for moving credentials file (kubernetes-sigs#2394)

* Add pre-upgrade task for moving credentials file

This reverts commit 7ef9f4d.

* add python interpreter workaround for localhost

.gitignore

@@ -1,6 +1,7 @@
 .vagrant
 *.retry
 inventory/vagrant_ansible_inventory
+inventory/credentials/
 inventory/group_vars/fake_hosts.yml
 inventory/host_vars/
 temp

.gitlab-ci.yml

@@ -109,7 +109,6 @@ before_script:
       ${SSH_ARGS}
       ${LOG_LEVEL}
       -e @${CI_TEST_VARS}
-      -e ansible_python_interpreter=${PYPATH}
       -e ansible_ssh_user=${SSH_USER}
       -e local_release_dir=${PWD}/downloads
       --limit "all:!fake_hosts"
@@ -129,7 +128,6 @@ before_script:
       ${SSH_ARGS}
       ${LOG_LEVEL}
       -e @${CI_TEST_VARS}
-      -e ansible_python_interpreter=${PYPATH}
       -e ansible_ssh_user=${SSH_USER}
       -e local_release_dir=${PWD}/downloads
       --limit "all:!fake_hosts"

roles/kubernetes/preinstall/tasks/main.yml

@@ -3,6 +3,11 @@
   tags:
     - asserts
 
+# This is run before bin_dir is pinned because these tasks are run on localhost
+- import_tasks: pre_upgrade.yml
+  tags:
+    - upgrade
+
 - name: Force binaries directory for Container Linux by CoreOS
   set_fact:
     bin_dir: "/opt/bin"

roles/kubernetes/preinstall/tasks/pre_upgrade.yml

@@ -0,0 +1,28 @@
+---
+- name: "Pre-upgrade | check if old credential dir exists"
+  local_action:
+    module: stat
+    path: "{{ inventory_dir }}/../credentials"
+  vars:
+    ansible_python_interpreter: "/usr/bin/env python"
+  register: old_credential_dir
+  become: no
+
+- name: "Pre-upgrade | check if new credential dir exists"
+  local_action:
+    module: stat
+    path: "{{ inventory_dir }}/credentials"
+  vars:
+    ansible_python_interpreter: "/usr/bin/env python"
+  register: new_credential_dir
+  become: no
+  when: old_credential_dir.stat.exists
+
+- name: "Pre-upgrade | move data from old credential dir to new"
+  local_action: command mv {{ inventory_dir }}/../credentials {{ inventory_dir }}/credentials
+  args:
+    creates: "{{ inventory_dir }}/credentials"
+  vars:
+    ansible_python_interpreter: "/usr/bin/env python"
+  become: no
+  when: old_credential_dir.stat.exists and not new_credential_dir.stat.exists