ensure-skopeo: add install from upstream option

To test current buildx we need a later skopeo that understands the OCI
manifest formats.  c.f. the zuul-executor image updates with
Iab667a92a5b6e6f8591db2aa435a782913d9d34f.

A recent enough version (1.9) isn't packaged for any LTS distros.  So
add an upstream option, but it's only implemented (for now) on Jammy,
where we will test with it.

Change-Id: I206a3cbfb16575f409771d96c2b7e49929e61a49

roles/ensure-skopeo/README.rst

@@ -1 +1,17 @@
 Install skopeo
+
+**Role Variables**
+
+.. zuul:rolevar:: ensure_skopeo_install_from_upstream
+   :default: false
+
+   Build and install skopeo from upstream.  This installs a go
+   development environment and build dependencies.  The binary is
+   installed into ``/usr/local/bin``.
+
+   Currently only implemented for Ubuntu Jammy
+
+.. zuul:rolevar:: ensure_skopeo_install_from_upstream_version
+   :default: v1.9.3
+
+   When building skoepo locally, the version tag to use.

roles/ensure-skopeo/defaults/main.yaml

@@ -0,0 +1,2 @@
+ensure_skopeo_install_from_upstream: false
+ensure_skopeo_install_from_upstream_version: 'v1.9.3'

roles/ensure-skopeo/tasks/Ubuntu-22.04.yaml

@@ -1,7 +1,49 @@
-- name: Install skopeo
+- name: Install skopeo from packages
+  when: not ensure_skopeo_install_from_upstream
   package:
     name:
       - skopeo
       - uidmap
     state: present
   become: yes
+
+- name: Install skopeo from upstream
+  when: ensure_skopeo_install_from_upstream
+  block:
+
+    - name: Install dependencies
+      become: yes
+      package:
+        name:
+          - libgpgme-dev
+          - libassuan-dev
+          - libbtrfs-dev
+          - libdevmapper-dev
+          - pkg-config
+          - build-essential
+          - golang
+        state: present
+
+    - name: Clone upstream source
+      git:
+        repo: https://github.com/containers/skopeo
+        dest: '{{ ansible_user_dir }}/skopeo'
+        version: '{{ ensure_skopeo_install_from_upstream_version }}'
+
+    - name: Build skopeo
+      command: 'make bin/skopeo'
+      args:
+        chdir: '{{ ansible_user_dir }}/skopeo'
+
+    - name: Install binary
+      become: yes
+      copy:
+        src: '{{ ansible_user_dir}}/skopeo/bin/skopeo'
+        dest: '/usr/local/bin/skopeo'
+        owner: root
+        group: root
+        mode: '0755'
+        remote_src: yes
+
+    - name: Test binary
+      command: '/usr/local/bin/skopeo --version'

test-playbooks/ensure-skopeo/main.yaml

@@ -5,6 +5,13 @@
 - hosts: all
   tasks:
 
+    - name: Additionally test from source on Ubuntu 22.04
+      when: ansible_distribution_release == 'jammy'
+      include_role:
+        name: ensure-skopeo
+      vars:
+        ensure_skopeo_install_from_upstream: true
+
     - name: Exercise skopeo
       command: /usr/bin/skopeo -v
       register: output