don't download if already at required version

tasks/install_go.yml

@@ -0,0 +1,48 @@
+- name: Setting facts based on previous autodiscovered facts
+  set_fact:
+    go_tarball_url: "{{ go_mirror }}{{ go_tarball_name }}"
+
+- name: Fetching sha256 checksum
+  set_fact:
+    go_tarball_checksum: "sha256:{{ lookup('url',go_tarball_url+'.sha256') }}"
+  when: go_tarball_checksum is not defined
+
+- name: Create download dir
+  file: state=directory path="{{ go_download_dir }}" mode=0755
+
+- name: Download the Go tarball
+  get_url:
+    url: "{{ go_tarball_url }}"
+    dest: "{{ go_download_dir }}"
+    checksum: "{{ go_tarball_checksum }}"
+
+- block:
+  - name: Copy Go certificate
+    copy:
+      src: linux_signing_key.pub
+      dest: /tmp/golang.pub
+
+  - name: Install Go certificate
+    command: gpg --import /tmp/golang.pub
+
+  - name: Download signature
+    get_url:
+      url: "{{ go_tarball_url }}.asc"
+      dest: "{{ go_download_dir }}"
+
+  - name: Verify the signature
+    shell: gpg --verify "{{ go_tarball_name }}.asc" "{{ go_tarball_name }}"
+    args:
+      chdir: "{{ go_download_dir }}"
+  when: go_check_signature
+
+- name: Remove old installation of Go
+  file:
+    path: /usr/local/go
+    state: absent
+
+- name: Extract the Go tarball
+  unarchive:
+    src: "{{ go_download_dir }}/{{ go_tarball_name }}"
+    dest: /usr/local
+    copy: no

tasks/main.yml

@@ -12,44 +12,13 @@
   when:
     - go_version is not defined
 
-- name: Setting facts based on previous autodiscovered facts
-  set_fact:
-    go_tarball_url: "{{ go_mirror }}{{ go_tarball_name }}"
-
-- name: Fetching sha256 checksum
-  set_fact:
-    go_tarball_checksum: "sha256:{{ lookup('url',go_tarball_url+'.sha256') }}"
-  when: go_tarball_checksum is not defined
-
-- name: Create download dir
-  file: state=directory path="{{ go_download_dir }}" mode=0755
-
-- name: Download the Go tarball
-  get_url:
-    url: "{{ go_tarball_url }}"
-    dest: "{{ go_download_dir }}"
-    checksum: "{{ go_tarball_checksum }}"
-
-- include_tasks: check_signature.yml
-  when: go_check_signature
-
 - name: Register the current Go version (if any)
   command: /usr/local/go/bin/go version
   ignore_errors: yes
   register: current_go_version
   changed_when: false
 
-- name: Remove old installation of Go
-  file:
-    path: /usr/local/go
-    state: absent
-  when: current_go_version|failed or current_go_version.stdout != go_version_target
-
-- name: Extract the Go tarball if Go is not yet installed or not the desired version
-  unarchive:
-    src: "{{ go_download_dir }}/{{ go_tarball_name }}"
-    dest: /usr/local
-    copy: no
+- include_tasks: install_go.yml
   when: current_go_version|failed or current_go_version.stdout != go_version_target
 
 - name: Add the Go bin directory to the PATH environment variable for all users