Check multipath (#1025)

## Problem

If installation medium has misconfigured multipath, then it failed with
strange error.


## Solution

Log when misconfiguration is detected.


## Testing

- *Tested manually*

service/lib/agama/storage/manager.rb

@@ -108,6 +108,7 @@ def on_probe(&block)
  def probe
  start_progress(4)
  config.pick_product(software.selected_product)
+ check_multipath
  progress.step(_("Activating storage devices")) { activate_devices }
  progress.step(_("Probing storage devices")) { probe_devices }
  progress.step(_("Calculating the storage proposal")) { calculate_proposal }
@@ -283,6 +284,23 @@ def security
  def questions_client
  @questions_client ||= Agama::DBus::Clients::Questions.new(logger: logger)
  end
+
+ MULTIPATH_CONFIG = "/etc/multipath.conf"
+ # Checks if all requirement for multipath probing is correct and if not
+ # then log it
+ def check_multipath
+ # check if kernel module is loaded
+ mods = `lsmod`.lines.grep(/dm_multipath/)
+ logger.warn("dm_multipath modules is not loaded") if mods.empty?
+
+ conf_file = File.exist?(MULTIPATH_CONFIG)
+ if conf_file
+ finder = File.readlines(MULTIPATH_CONFIG).grep(/find_multipaths\s+smart/)
+ logger.warn("find_multipaths is not set to smart value") if finder.empty?
+ else
+ logger.warn("#{MULTIPATH_CONFIG} does not exist")
+ end
+ end
  end
  end
 end

service/package/rubygem-agama.changes

@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Thu Feb 1 13:08:39 UTC 2024 - Josef Reidinger <jreidinger@suse.com>
+
+- Log if multipath probing is misconfigured (bsc#1215598) 
+
 -------------------------------------------------------------------
 Mon Jan 29 13:51:30 UTC 2024 - José Iván López González <jlopez@suse.com>