Describe workaround when restore fails because of `Errno::EBUSY`

When `Errno::EBUSY` is raised during restore, this could indicate that
the directory being restored into is a mountpoint. In this case we
explain the user how to retry the restore.

3 files changed, 18 insertions, 0 deletions

diff --git a/lib/backup/files.rb b/lib/backup/files.rb
index 88cb7e7b5a4..9895db9e451 100644
--- a/lib/backup/files.rb
+++ b/lib/backup/files.rb
@@ -53,6 +53,8 @@ module Backup
           FileUtils.mv(files, timestamped_files_path)
         rescue Errno::EACCES
           access_denied_error(app_files_dir)
+        rescue Errno::EBUSY
+          resource_busy_error(app_files_dir)
         end
       end
     end
diff --git a/lib/backup/helper.rb b/lib/backup/helper.rb
index a1ee0faefe9..54b9ce10b4d 100644
--- a/lib/backup/helper.rb
+++ b/lib/backup/helper.rb
@@ -13,5 +13,19 @@ module Backup
       EOS
       raise message
     end
+
+    def resource_busy_error(path)
+      message = <<~EOS
+
+      ### NOTICE ###
+      As part of restore, the task tried to rename `#{path}` before restoring.
+      This could not be completed, perhaps `#{path}` is a mountpoint?
+
+      To complete the restore, please move the contents of `#{path}` to a
+      different location and run the restore task again.
+
+      EOS
+      raise message
+    end
   end
 end
diff --git a/lib/backup/repository.rb b/lib/backup/repository.rb
index 89e3f1d9076..65e06fd78c0 100644
--- a/lib/backup/repository.rb
+++ b/lib/backup/repository.rb
@@ -81,6 +81,8 @@ module Backup
           FileUtils.mv(files, bk_repos_path)
         rescue Errno::EACCES
           access_denied_error(path)
+        rescue Errno::EBUSY
+          resource_busy_error(path)
         end
       end
     end