Inject the /etc/resolv.conf file, sort the restore scripts

src/modules/RootPart.rb

@@ -31,6 +31,8 @@
 require "yast2/fs_snapshot_store"
 require "y2storage"
 
+require "fileutils"
+
 module Yast
   class RootPartClass < Module
     include Logger
@@ -1675,11 +1677,14 @@ def MountPartitions(root_device_current)
         end
         Update.clean_backup
         create_backup
+        inject_resolv_conf
       end
 
       success
     end
 
+    RESOLV_CONF = "/etc/resolv.conf".freeze
+
     # known configuration files that are changed during update, so we need to
     # backup them to restore if something goes wrong (bnc#882039)
     BACKUP_DIRS = {
@@ -1689,14 +1694,28 @@ def MountPartitions(root_device_current)
         "/etc/zypp/repos.d",
         "/etc/zypp/services.d",
         "/etc/zypp/credentials.d"
+      ],
+      # this should be restored as the very last one, after restoring the original
+      # resolv.conf the network might not work properly in the chroot
+      "0999-resolv_conf" => [
+        RESOLV_CONF
       ]
     }
+
     def create_backup
       BACKUP_DIRS.each_pair do |name, paths|
         Update.create_backup(name, paths)
       end
     end
 
+    # inject the /etc/resolv.conf from the inst-sys to the chroot so
+    # the network connection works for the chrooted scripts
+    # the original file is backed up and restored later
+    def inject_resolv_conf
+      return unless File.exist?(RESOLV_CONF)
+      ::FileUtils.cp(RESOLV_CONF, File.join(Installation.destdir, RESOLV_CONF))
+    end
+
     # Get architecture of an elf file.
     def GetArchOfELF(filename)
       bash_out = Convert.to_map(