migrating config to tmp folder

docs/administration/CLI_tasks/config.md

@@ -32,16 +32,20 @@
     config :pleroma, configurable_from_database: false
     ```
 
-To delete transferred settings from database optional flag `-d` can be used. `<env>` is `prod` by default.
+Options:
+
+- `<path>` - where to save migrated config. E.g. `--path=/tmp`. If file saved into non standart folder, you must manually copy file into directory where Pleroma can read it. For OTP install path will be `PLEROMA_CONFIG_PATH` or `/etc/pleroma`. For installation from source - `config` directory in the pleroma folder.
+- `<env>` - environment, for which is migrated config. By default is `prod`.
+- To delete transferred settings from database optional flag `-d` can be used
 
 === "OTP"
     ```sh
-     ./bin/pleroma_ctl config migrate_from_db [--env=<env>] [-d]
+     ./bin/pleroma_ctl config migrate_from_db [--env=<env>] [-d] [--path=<path>]
     ```
 
 === "From Source"
     ```sh
-    mix pleroma.config migrate_from_db [--env=<env>] [-d]
+    mix pleroma.config migrate_from_db [--env=<env>] [-d] [--path=<path>]
     ```
 
 ## Dump all of the config settings defined in the database

lib/mix/tasks/pleroma/config.ex

@@ -27,7 +27,7 @@ def run(["migrate_from_db" | options]) do
 
       {opts, _} =
         OptionParser.parse!(options,
-          strict: [env: :string, delete: :boolean],
+          strict: [env: :string, delete: :boolean, path: :string],
           aliases: [d: :delete]
         )
 
@@ -259,18 +259,43 @@ defp create(group, settings) do
   defp migrate_from_db(opts) do
     env = opts[:env] || Pleroma.Config.get(:env)
 
+    filename = "#{env}.exported_from_db.secret.exs"
+
     config_path =
-      if Pleroma.Config.get(:release) do
+      cond do
+        opts[:path] ->
+          opts[:path]
+
+        Pleroma.Config.get(:release) ->
           :config_path
           |> Pleroma.Config.get()
           |> Path.dirname()
-      else
+
+        true ->
           "config"
       end
-      |> Path.join("#{env}.exported_from_db.secret.exs")
+      |> Path.join(filename)
 
-    file = File.open!(config_path, [:write, :utf8])
+    with {:ok, file} <- File.open(config_path, [:write, :utf8]) do
+      write_config(file, config_path, opts)
+      shell_info("Database configuration settings have been exported to #{config_path}")
+    else
+      _ ->
+        shell_error("Impossible to save settings to this directory #{Path.dirname(config_path)}")
+        tmp_config_path = Path.join("/tmp", filename)
+        file = File.open!(tmp_config_path)
 
+        shell_info(
+          "Saving database configuration settings to #{tmp_config_path}. Copy it to the #{
+            Path.dirname(config_path)
+          } manually."
+        )
+
+        write_config(file, tmp_config_path, opts)
+    end
+  end
+
+  defp write_config(file, path, opts) do
     IO.write(file, config_header())
 
     ConfigDB
@@ -278,11 +303,7 @@ defp migrate_from_db(opts) do
     |> Enum.each(&write_and_delete(&1, file, opts[:delete]))
 
     :ok = File.close(file)
-    System.cmd("mix", ["format", config_path])
-
-    shell_info(
-      "Database configuration settings have been exported to config/#{env}.exported_from_db.secret.exs"
-    )
+    System.cmd("mix", ["format", path])
   end
 
   if Code.ensure_loaded?(Config.Reader) do

test/mix/tasks/pleroma/config_test.exs

@@ -200,6 +200,44 @@ test "load a settings with large values and pass to file", %{temp_file: temp_fil
     end
   end
 
+  describe "migrate_from_db/1" do
+    setup do: clear_config(:configurable_from_database, true)
+
+    setup do
+      insert_config_record(:pleroma, :setting_first, key: "value", key2: ["Activity"])
+      insert_config_record(:pleroma, :setting_second, key: "value2", key2: [Repo])
+      insert_config_record(:quack, :level, :info)
+
+      path = "test/instance_static"
+      file_path = Path.join(path, "temp.exported_from_db.secret.exs")
+
+      on_exit(fn -> File.rm!(file_path) end)
+
+      [file_path: file_path]
+    end
+
+    test "with path parameter", %{file_path: file_path} do
+      MixTask.run(["migrate_from_db", "--env", "temp", "--path", Path.dirname(file_path)])
+
+      file = File.read!(file_path)
+      assert file =~ "config :pleroma, :setting_first,"
+      assert file =~ "config :pleroma, :setting_second,"
+      assert file =~ "config :quack, :level, :info"
+    end
+
+    test "release", %{file_path: file_path} do
+      clear_config(:release, true)
+      clear_config(:config_path, file_path)
+
+      MixTask.run(["migrate_from_db", "--env", "temp"])
+
+      file = File.read!(file_path)
+      assert file =~ "config :pleroma, :setting_first,"
+      assert file =~ "config :pleroma, :setting_second,"
+      assert file =~ "config :quack, :level, :info"
+    end
+  end
+
   describe "operations on database config" do
     setup do: clear_config(:configurable_from_database, true)