fetch checksum in separate task

Author: yogo1212

defaults/main.yml

@@ -8,9 +8,12 @@ go_tarball_name: "go{{ go_version }}.linux-amd64.tar.gz"
 # mirror for Go release tarballs
 go_mirror: "https://storage.googleapis.com/golang/"
 
-#go_tarball_checksum: "sha256:43ad621c9b014cde8db17393dc108378d37bc853aa351a6c74bf6432c1bbd182"
 go_version_target: "go version go{{ go_version }} linux/amd64"
 
+# (TODO defaults->documentation)
+# using tarball_name+".sha256"
+#go_tarball_checksum: "sha256:b5a64335f1490277b585832d1f6c7f8c6c11206cba5cd3f771dcb87b98ad1a33"
+
 # the signature will be fetched from the mirror
 # using tarball_name+".asc"
 go_check_signature: true

tasks/main.yml

@@ -14,9 +14,13 @@
 
 - name: Setting facts based on previous autodiscovered facts
   set_fact:
-    go_tarball_checksum: "sha256:{{ lookup('url',go_mirror+go_tarball_name+'.sha256') }}"
     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