X-Git-Url: http://git.squeep.com/?a=blobdiff_plain;f=lib%2Fmix%2Ftasks%2Fpleroma%2Fdatabase.ex;h=30c0d2bf17c467d6f561a3bc46873ae039cd08e0;hb=4e14945670bac15a6e183eb8c552d6e0669713ac;hp=a01c36ece30754ada443c22dffc5e3d29b9f73cf;hpb=131f3219e6b895139c5647cd2050dd22adce7139;p=akkoma

diff --git a/lib/mix/tasks/pleroma/database.ex b/lib/mix/tasks/pleroma/database.ex
index a01c36ece..30c0d2bf1 100644
--- a/lib/mix/tasks/pleroma/database.ex
+++ b/lib/mix/tasks/pleroma/database.ex
@@ -1,5 +1,5 @@
 # Pleroma: A lightweight social networking server
-# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Mix.Tasks.Pleroma.Database do
@@ -8,15 +8,42 @@ defmodule Mix.Tasks.Pleroma.Database do
   alias Pleroma.Object
   alias Pleroma.Repo
   alias Pleroma.User
+
   require Logger
   require Pleroma.Constants
+
   import Ecto.Query
   import Mix.Pleroma
+
   use Mix.Task
 
   @shortdoc "A collection of database related tasks"
   @moduledoc File.read!("docs/administration/CLI_tasks/database.md")
 
+  # Rolls back a specific migration (leaving subsequent migrations applied)
+  # Based on https://stackoverflow.com/a/53825840
+  def run(["rollback", version]) do
+    start_pleroma()
+
+    version = String.to_integer(version)
+    re = ~r/^#{version}_.*\.exs/
+    path = Application.app_dir(:pleroma, Path.join(["priv", "repo", "migrations"]))
+
+    result =
+      with {:find, "" <> file} <- {:find, Enum.find(File.ls!(path), &String.match?(&1, re))},
+           {:compile, [{mod, _} | _]} <- {:compile, Code.compile_file(Path.join(path, file))},
+           {:rollback, :ok} <- {:rollback, Ecto.Migrator.down(Repo, version, mod)} do
+        {:ok, "Reversed migration: #{file}"}
+      else
+        {:find, _} -> {:error, "No migration found with version prefix: #{version}"}
+        {:compile, e} -> {:error, "Problem compiling migration module: #{inspect(e)}"}
+        {:rollback, e} -> {:error, "Problem reversing migration: #{inspect(e)}"}
+        e -> {:error, "Something unexpected happened: #{inspect(e)}"}
+      end
+
+    IO.inspect(result)
+  end
+
   def run(["remove_embedded_objects" | args]) do
     {options, [], []} =
       OptionParser.parse(
@@ -48,9 +75,15 @@ defmodule Mix.Tasks.Pleroma.Database do
   def run(["update_users_following_followers_counts"]) do
     start_pleroma()
 
-    User
-    |> Repo.all()
-    |> Enum.each(&User.update_follower_count/1)
+    Repo.transaction(
+      fn ->
+        from(u in User, select: u)
+        |> Repo.stream()
+        |> Stream.each(&User.update_follower_count/1)
+        |> Stream.run()
+      end,
+      timeout: :infinity
+    )
   end
 
   def run(["prune_objects" | args]) do