Added pfsense upgrade roles

roles/pfsense_upgrade/tasks/preflight.yml

@@ -0,0 +1,41 @@
+---
+# roles/pfsense_upgrade/tasks/preflight.yml
+# Validate SSH connectivity, confirm host is pfSense, check disk space.
+
+- name: Verify SSH connectivity to pfSense host
+  ansible.builtin.raw: echo "ping"
+  register: _ssh_test
+  changed_when: false
+  failed_when: _ssh_test.rc != 0
+
+- name: Confirm host is running pfSense (check version file)
+  ansible.builtin.raw: test -f {{ pfsense_version_file }} && echo "pfsense_ok"
+  register: _pfsense_check
+  changed_when: false
+  failed_when: "'pfsense_ok' not in _pfsense_check.stdout"
+
+- name: Check available disk space on root filesystem (must be ≥ 200 MB)
+  ansible.builtin.raw: >
+    df -m / | awk 'NR==2 {print $4}'
+  register: _disk_avail
+  changed_when: false
+
+- name: Fail if disk space is insufficient
+  ansible.builtin.fail:
+    msg: >
+      Host {{ inventory_hostname }} only has {{ _disk_avail.stdout | trim }} MB free on /.
+      At least 200 MB is required to safely upgrade pfSense.
+  when: (_disk_avail.stdout | trim | int) < 200
+
+- name: Check that pfSense-upgrade binary exists
+  ansible.builtin.raw: test -x {{ pfsense_upgrade_bin }} && echo "bin_ok"
+  register: _bin_check
+  changed_when: false
+  failed_when: "'bin_ok' not in _bin_check.stdout"
+
+- name: Pre-flight summary
+  ansible.builtin.debug:
+    msg: >
+      Pre-flight OK — {{ inventory_hostname }}:
+      disk free={{ _disk_avail.stdout | trim }}MB,
+      pfSense-upgrade binary present.