auto discover version

README.md

@@ -6,17 +6,17 @@ Ansible role that installs [Go](https://golang.org/). The latest stable release
 Role Variables
 --------------
 
-All of these variables are optional and should only be changed if you need to install a different version of Go (e.g. if you are installing on FreeBSD, or if you need to use an earlier release).
+By default, ansible-go detects the latest version of Go using github tags and version sort and checks if that version is already installed.
+If not, it downloads the tarball from the official mirror (if there's not already a file with matching SHA256 checksum), verifies the GPG signature, and extracts it in `/usr/local/src/`.
 
-`go_tarball`: The tarball that you want to install. A list of options can be found on the [Go Downloads page](https://golang.org/dl/). The default is the official x86 64-bit Linux tarball for the latest stable release.
+You can install a specific version of Go (e.g. if you are installing on FreeBSD, or if you need to use an earlier release) by setting the `go_version` variable. A list of versions can be found on the [Go Downloads page](https://golang.org/dl/).
+E.g. `go_version: "1.10"`.
 
-`go_tarball_checksum`: This variable specifies the algorithm and checksum for the tarball that you want to install (e.g. `sha1:c7d78ba4df574b5f9a9bb5d17505f40c4d89b81c` or `sha256:a96cce8ce43a9bf9b2a4c7d470bc7ee0cb00410da815980681c8353218dcf146`). The default is the SHA256 checksum of the official x86 64-bit tarball for the latest stable release. Checksums can be found on the [Go Download Page](https://golang.org/dl/).
+The `go_tarball_checksum` variable controls how the integrity of the downloaded tarball is validated.
+See the ansible [documentation](https://docs.ansible.com/ansible/latest/modules/get_url_module.html) for details and syntax (`checksum` field).
+Tarball checksums can be found on the [Go Download Page](https://golang.org/dl/).
 
-`go_version_target`: The string that the `go version` command is expected to return (e.g. "go version go1.2.1 linux/amd64"). This variable is used to control whether or not the Go tarball should be extracted, thereby upgrading (or downgrading) a previously installed copy. If the installed version already matches the target, the extraction step is skipped.
-
-`go_download_location`: The full download URL. This variable simply appends the `go_tarball` variable onto the Go Download URL. This should not need to be modified.
-
-`set_go_path`: Whether or not to set the GOPATH for all users. The default is `true`.
+For more options, check the [default](defaults/main.yml) variables.
 
 License
 -------

defaults/main.yml

@@ -1,5 +1,17 @@
 ---
-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
+
+# mirror for Go release tarballs
+go_mirror: "https://storage.googleapis.com/golang/"
+go_tarball_name: "go{{ go_version }}.linux-amd64.tar.gz"
+
+go_version_target: "go version go{{ go_version }} linux/amd64"
+
+# the signature will be fetched from the mirror
+# using tarball_name+".asc"
+go_check_signature: true
+
+# TODO technically, it's the installation dir
+go_download_dir: "/usr/local/src/"
+
+# set GOPATH using /etc/profile.d/
+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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+-----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 +1,51 @@
+- 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 -V | 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 is failed or current_go_version.stdout != go_version_target
 
 - name: Add the Go bin directory to the PATH environment variable for all users
   copy: