Add ipv6 disable check

definitions/checks/check_ipv6_disable.rb

@@ -0,0 +1,23 @@
+class Checks::CheckIpv6Disable < ForemanMaintain::Check
+  metadata do
+    label :check_ipv6_disable
+    description 'Check if ipv6.disable=1 is set at kernel level'
+  end
+
+  def run
+    grub_file = File.read('/etc/default/grub')
+
+    assert(
+      !grub_file.include?("ipv6.disable=1"),
+      "The kernel contains ipv6.disable=1 which is known to break installation and upgrade, remove and reboot before continuining."
+    )
+  end
+
+  def error_message
+    base = "The kernel contains ipv6.disable=1 which is known to break installation and upgrade, remove and reboot before continuining."
+
+    if feature(:instance).downstream
+      base += "See https://access.redhat.com/solutions/5045841 for more details."
+    end
+  end
+end

definitions/scenarios/update.rb

@@ -28,6 +28,7 @@ def compose
         Checks::SystemRegistration,
         Checks::CheckHotfixInstalled,
         Checks::CheckTmout,
+        Checks::CheckIpv6Disable,
         Checks::CheckUpstreamRepository,
         Checks::Disk::AvailableSpace,
         Checks::Disk::AvailableSpaceCandlepin, # if candlepin

definitions/scenarios/upgrade_to_capsule_6_16.rb

@@ -27,6 +27,7 @@ class PreUpgradeCheck < Abstract
     def compose
       add_steps(find_checks(:default))
       add_steps(find_checks(:pre_upgrade))
+      add_step(Checks::CheckIpv6Disable)
       add_step(Checks::Disk::AvailableSpacePostgresql13)
       add_step(Checks::Repositories::Validate.new(:version => '6.16'))
     end

definitions/scenarios/upgrade_to_capsule_6_16_z.rb

@@ -27,6 +27,7 @@ class PreUpgradeCheck < Abstract
     def compose
       add_steps(find_checks(:default))
       add_steps(find_checks(:pre_upgrade))
+      add_step(Checks::CheckIpv6Disable)
       add_step(Checks::Repositories::Validate.new(:version => '6.16'))
     end
   end

definitions/scenarios/upgrade_to_satellite_6_16.rb

@@ -27,6 +27,7 @@ class PreUpgradeCheck < Abstract
     def compose
       add_steps(find_checks(:default))
       add_steps(find_checks(:pre_upgrade))
+      add_step(Checks::CheckIpv6Disable)
       add_step(Checks::Disk::AvailableSpacePostgresql13)
       add_step(Checks::Repositories::Validate.new(:version => '6.16'))
       add_step(Checks::CheckOrganizationContentAccessMode)

definitions/scenarios/upgrade_to_satellite_6_16_z.rb

@@ -27,6 +27,7 @@ class PreUpgradeCheck < Abstract
     def compose
       add_steps(find_checks(:default))
       add_steps(find_checks(:pre_upgrade))
+      add_step(Checks::CheckIpv6Disable)
       add_step(Checks::Repositories::Validate.new(:version => '6.16'))
     end
   end