refactor: support customizing prometheus url/mirror

Signed-off-by: gardar <gardar@users.noreply.github.com>

roles/prometheus/README.md

@@ -26,6 +26,8 @@ All variables which can be overridden are stored in [defaults/main.yml](defaults
 | `prometheus_skip_install` | false | Prometheus installation tasks gets skipped when set to true. |
 | `prometheus_binary_local_dir` | "" | Allows to use local packages instead of ones distributed on github. As parameter it takes a directory where `prometheus` AND `promtool` binaries are stored on host on which ansible is ran. This overrides `prometheus_version` parameter |
 | `prometheus_config_dir` | /etc/prometheus | Path to directory with prometheus configuration |
+| `prometheus_binary_url` | `https://github.com/prometheus/prometheus/releases/download/v{{ prometheus_version }}/prometheus-{{ prometheus_version }}.linux-{{ go_arch }}.tar.gz` | URL of the prometheus binaries .tar.gz file |
+| `prometheus_checksums_url` | `https://github.com/prometheus/prometheus/releases/download/v{{ prometheus_version }}/sha256sums.txt` | URL of the prometheus checksums file |
 | `prometheus_db_dir` | /var/lib/prometheus | Path to directory with prometheus database |
 | `prometheus_read_only_dirs`| [] | Additional paths that Prometheus is allowed to read (useful for SSL certs outside of the config directory) |
 | `prometheus_web_listen_address` | "0.0.0.0:9090" | Address on which prometheus will be listening |

roles/prometheus/defaults/main.yml

@@ -1,6 +1,9 @@
 ---
 prometheus_version: 2.27.0
 prometheus_binary_local_dir: ''
+prometheus_binary_url: "https://github.com/prometheus/prometheus/releases/download/v{{ prometheus_version }}/\
+                        prometheus-{{ prometheus_version }}.linux-{{ go_arch }}.tar.gz"
+prometheus_checksums_url: "https://github.com/prometheus/prometheus/releases/download/v{{ prometheus_version }}/sha256sums.txt"
 prometheus_skip_install: false
 
 prometheus_config_dir: /etc/prometheus

roles/prometheus/tasks/install.yml

@@ -43,8 +43,7 @@
     - name: Download prometheus binary to local folder
       become: false
       ansible.builtin.get_url:
-        url: "https://github.com/prometheus/prometheus/releases/download/v{{ prometheus_version }}/\
-              prometheus-{{ prometheus_version }}.linux-{{ go_arch }}.tar.gz"
+        url: "{{ prometheus_binary_url }}"
         dest: "/tmp/prometheus-{{ prometheus_version }}.linux-{{ go_arch }}.tar.gz"
         checksum: "sha256:{{ __prometheus_checksum }}"
         mode: 0644

roles/prometheus/tasks/preflight.yml

@@ -91,8 +91,7 @@
   block:
     - name: "Get checksum list"
       ansible.builtin.set_fact:
-        __prometheus_checksums: "{{ lookup('url', 'https://github.com/prometheus/prometheus/releases/download/v' + prometheus_version + '/sha256sums.txt',
-                                 wantlist=True) | list }}"
+        __prometheus_checksums: "{{ lookup('url', prometheus_checksums_url, wantlist=True) | list }}"
       run_once: true
       until: __prometheus_checksums is search('linux-' + go_arch + '.tar.gz')
       retries: 10