Handling of YAST_REUSE_LVM linuxrc option

src/lib/y2storage/proposal/lvm_helper.rb

@@ -166,8 +166,6 @@ def new_volume_group
       # @return [Boolean]
       def try_to_reuse?
         # Setting introduced to completely avoid LVM reusing in D-Installer.
-        # It's a new playground, so no need to carry YaST behaviors that have
-        # proven to be confusing.
         return false if settings.lvm_vg_reuse == false
 
         # We introduced this when we still didn't have a mechanism to activate

src/lib/y2storage/proposal_settings.rb

@@ -29,6 +29,7 @@
 require "y2storage/encryption_method"
 require "y2storage/equal_by_instance_variables"
 require "y2storage/proposal_space_settings"
+require "y2storage/storage_env"
 
 module Y2Storage
   # Class to manage settings used by the proposal (typically read from control.xml)
@@ -236,6 +237,7 @@ def self.new_for_current_product
     def for_current_product
       apply_defaults
       load_features
+      apply_user_enforced
     end
 
     # Produces a deep copy of settings
@@ -401,6 +403,14 @@ def apply_defaults
       end
     end
 
+    # Some values can be explicitly enforced by user
+    # This setting should have precendence over everything else
+    def apply_user_enforced
+      value = StorageEnv.instance.requested_lvm_reuse
+
+      send(:lvm_vg_reuse=, StorageEnv.instance.requested_lvm_reuse) if !value.nil?
+    end
+
     # Overrides the settings with values read from the YaST product features
     # (i.e. values in /control.xml).
     #

src/lib/y2storage/storage_env.rb

@@ -36,8 +36,11 @@ class StorageEnv
 
     ENV_LIBSTORAGE_IGNORE_PROBE_ERRORS = "LIBSTORAGE_IGNORE_PROBE_ERRORS".freeze
 
+    ENV_REUSE_LVM = "YAST_REUSE_LVM".freeze
+
     private_constant :ENV_MULTIPATH, :ENV_BIOS_RAID, :ENV_ACTIVATE_LUKS, :ENV_LUKS2_AVAILABLE
     private_constant :ENV_LIBSTORAGE_IGNORE_PROBE_ERRORS
+    private_constant :ENV_REUSE_LVM
 
     def initialize
       reset_cache
@@ -89,6 +92,19 @@ def luks2_available?
       active?(ENV_LUKS2_AVAILABLE, default: false)
     end
 
+    # Whether YaST should reuse existing LVM
+    #
+    # see jsc#PED-6407 or jsc#IBM-1315
+    #
+    # @return [Boolean, nil] boolean as explicitly set by user, nil if user set nothing
+    def requested_lvm_reuse
+      value = read(ENV_REUSE_LVM)
+
+      return env_str_to_bool(value) if value
+
+      nil
+    end
+
     # Whether errors during libstorage probing should be ignored.
     #
     # See bsc#1177332:
@@ -106,6 +122,13 @@ def ignore_probe_errors?
 
     private
 
+    # Takes a string and translates it to bool in a similar way how linuxrc does
+    def env_str_to_bool(value)
+      # Similar to what linuxrc does, also consider the flag activated if the
+      # variable is used with no value or with "1"
+      value.casecmp?("on") || value.empty? || value == "1"
+    end
+
     # Whether the env variable is active
     #
     # @param variable [String]
@@ -116,9 +139,7 @@ def active?(variable, default: false)
 
       value = read(variable)
       result = if value
-        # Similar to what linuxrc does, also consider the flag activated if the
-        # variable is used with no value or with "1"
-        value.casecmp?("on") || value.empty? || value == "1"
+        env_str_to_bool(value)
       else
         default
       end