auto discover version

defaults/main.yml

@@ -1,5 +1,21 @@
 ---
-go_tarball: "go1.8.1.linux-amd64.tar.gz"
-go_tarball_checksum: "sha256:a579ab19d5237e263254f1eac5352efcf1d70b9dacadb6d6bb12b0911ede8994"
-go_version_target: "go version go1.8.1 linux/amd64"
-set_go_path: true
+# (TODO defaults->documentation)
+# override version discovery from github releases
+#go_version: "1.10"
+
+go_tarball_name: "go{{ go_version }}.linux-amd64.tar.gz"
+
+# mirror for Go release tarballs
+go_mirror: "https://storage.googleapis.com/golang/"
+
+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
+go_download_dir: "/usr/local/src/"
+set_go_path: true

files/linux_signing_key.pub

@@ -0,0 +1,132 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+Version: GnuPG v1.4.2.2 (GNU/Linux)
+
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+=Quqp
+-----END PGP PUBLIC KEY BLOCK-----
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+Version: GnuPG v1
+
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+-----END PGP PUBLIC KEY BLOCK-----

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
+    remote_src: yes

tasks/main.yml

@@ -1,28 +1,26 @@
 ---
-- name: Download the Go tarball
-  get_url:
-    url: "{{ go_download_location }}"
-    dest: /usr/local/src/{{ go_tarball }}
-    checksum: "{{ go_tarball_checksum }}"
+- block:
+  - name: Discover the latest version
+    shell:
+      curl https://api.github.com/repos/golang/go/git/refs/tags/ | egrep 'ref.*refs/tags/go([0-9.]+)",' | egrep -o "[0-9.]+" | sort | tail -n 1
+    register: latest_release
+    changed_when: False
+
+  - name: Setting version from latest release
+    set_fact:
+      go_version: "{{ latest_release.stdout_lines[0] }}"
+  when:
+    - go_version is not defined
 
 - name: Register the current Go version (if any)
   command: /usr/local/go/bin/go version
   ignore_errors: yes
-  register: go_version
+  register: current_go_version
   changed_when: false
 
-- name: Remove old installation of Go
-  file:
-    path: /usr/local/go
-    state: absent
-  when: go_version|failed or go_version.stdout != go_version_target
-
-- name: Extract the Go tarball if Go is not yet installed or not the desired version
-  unarchive:
-    src: /usr/local/src/{{ go_tarball }}
-    dest: /usr/local
-    copy: no
-  when: go_version|failed or go_version.stdout != go_version_target
+- name: Install Go
+  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
   copy: