From cee8d2fb55fd4eadccfc7e89ae1c87a35711d569 Mon Sep 17 00:00:00 2001
From: Timotej Lazar <timotej.lazar@fri.uni-lj.si>
Date: Mon, 27 Oct 2025 22:47:58 +0100
Subject: [PATCH] windows: set up windows_exporter

---
 roles/windows/README.md                  |  6 ++++++
 roles/windows/handlers/main.yml          |  6 ++++++
 roles/windows/tasks/main.yml             |  4 ++++
 roles/windows/tasks/windows_exporter.yml | 25 ++++++++++++++++++++++++
 4 files changed, 41 insertions(+)
 create mode 100644 roles/windows/tasks/windows_exporter.yml

diff --git a/roles/windows/README.md b/roles/windows/README.md
index 84ebc28..efca8d9 100644
--- a/roles/windows/README.md
+++ b/roles/windows/README.md
@@ -1,3 +1,9 @@
 Set up a generic Windows host.
 
 Rename and configure network interfaces. Configure the SSH server.
+
+If `windows_exporter_version` is set, Prometheus [windows_exporter](https://github.com/prometheus-community/windows_exporter) will be installed and configured on port 9100.
+
+Before first run, set the network profile to private and start the SSH server manually with
+
+    start-service sshd
diff --git a/roles/windows/handlers/main.yml b/roles/windows/handlers/main.yml
index 3e97365..14c46f3 100644
--- a/roles/windows/handlers/main.yml
+++ b/roles/windows/handlers/main.yml
@@ -3,3 +3,9 @@
     name: sshd
     state: restarted
   when: "'handler' not in ansible_skip_tags"
+
+- name: restart windows_exporter
+  win_service:
+    name: windows_exporter
+    state: restarted
+  when: "'handler' not in ansible_skip_tags"
diff --git a/roles/windows/tasks/main.yml b/roles/windows/tasks/main.yml
index 93d2a00..85acf59 100644
--- a/roles/windows/tasks/main.yml
+++ b/roles/windows/tasks/main.yml
@@ -45,3 +45,7 @@
     name: sshd
     start_mode: auto
     state: started
+
+- name: Install windows-exporter for prometheus metrics
+  when: 'windows_exporter_version is defined'
+  include_tasks: windows_exporter.yml
diff --git a/roles/windows/tasks/windows_exporter.yml b/roles/windows/tasks/windows_exporter.yml
new file mode 100644
index 0000000..0ff0a12
--- /dev/null
+++ b/roles/windows/tasks/windows_exporter.yml
@@ -0,0 +1,25 @@
+- name: Check current windows_exporter version
+  win_command: '"c:\program files\windows_exporter\windows_exporter.exe" --version'
+  failed_when: false
+  changed_when: false
+  register: result
+
+- when: '"stderr" not in result or "version "+windows_exporter_version not in result.stderr'
+  block:
+    - name: Download windows_exporter
+      win_get_url:
+        url: "https://github.com/prometheus-community/windows_exporter/releases/download/v{{ windows_exporter_version }}/windows_exporter-{{ windows_exporter_version }}-amd64.msi"
+        dest: 'c:\windows\temp\windows_exporter.msi'
+        force: true
+
+    - name: Install Windows exporter
+      win_package:
+        path: 'c:\windows\temp\windows_exporter.msi'
+        arguments: "LISTEN_PORT=9100"
+      notify: restart windows_exporter
+
+    - name: Enable windows_exporter service
+      win_service:
+        name: windows_exporter
+        start_mode: delayed
+        state: started