Add configurable temporary directory

config/config.exs

@@ -820,7 +820,8 @@
 
 config :pleroma, Pleroma.Backup,
   purge_after_days: 30,
-  limit_days: 7
+  limit_days: 7,
+  dir: nil
 
 # Import environment specific config. This must remain at the bottom
 # of this file so it overrides the configuration defined above.

docs/configuration/cheatsheet.md

@@ -1090,6 +1090,12 @@ Control favicons for instances.
 
 * `:purge_after_days` an integer, remove backup achives after N days.
 * `:limit_days` an integer, limit user to export not more often than once per N days.
+* `:dir` a string with a path to backup temporary directory or `nil` to let Pleroma choose temporary directory in the following order:
+    1. the directory named by the TMPDIR environment variable
+    2. the directory named by the TEMP environment variable
+    3. the directory named by the TMP environment variable
+    4. C:\TMP on Windows or /tmp on Unix-like operating systems
+    5. as a last resort, the current working directory
 
 ## Frontend management
 

lib/pleroma/backup.ex

@@ -126,7 +126,7 @@ def process(%__MODULE__{} = backup) do
   def export(%__MODULE__{} = backup) do
     backup = Repo.preload(backup, :user)
     name = String.trim_trailing(backup.file_name, ".zip")
-    dir = Path.join(System.tmp_dir!(), name)
+    dir = dir(name)
 
     with :ok <- File.mkdir(dir),
          :ok <- actor(dir, backup.user),
@@ -139,6 +139,11 @@ def export(%__MODULE__{} = backup) do
     end
   end
 
+  def dir(name) do
+    dir = Pleroma.Config.get([__MODULE__, :dir]) || System.tmp_dir!()
+    Path.join(dir, name)
+  end
+
   def upload(%__MODULE__{} = backup, zip_path) do
     uploader = Pleroma.Config.get([Pleroma.Upload, :uploader])