[#2497] Customized exexec launch to support root operation (currently required by Gitlab CI).

lib/pleroma/exec.ex

@@ -0,0 +1,38 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Exec do
+  @moduledoc "Pleroma wrapper around Exexec commands."
+
+  alias Pleroma.Config
+
+  def ensure_started(options_overrides \\ %{}) do
+    options =
+      if Config.get([:exexec, :root_mode]) || System.get_env("USER") == "root" do
+        # Note: running as `root` is discouraged (yet Gitlab CI does that by default)
+        %{root: true, user: "root", limit_users: ["root"]}
+      else
+        %{}
+      end
+
+    options =
+      options
+      |> Map.merge(Config.get([:exexec, :options], %{}))
+      |> Map.merge(options_overrides)
+
+    with {:error, {:already_started, pid}} <- Exexec.start(options) do
+      {:ok, pid}
+    end
+  end
+
+  def run(cmd, options \\ %{}) do
+    ensure_started()
+    Exexec.run(cmd, options)
+  end
+
+  def cmd(cmd, options \\ %{}) do
+    options = Map.merge(%{sync: true, stdout: true}, options)
+    run(cmd, options)
+  end
+end

lib/pleroma/helpers/media_helper.ex

@@ -7,8 +7,6 @@ defmodule Pleroma.Helpers.MediaHelper do
   Handles common media-related operations.
   """
 
-  @ffmpeg_opts [{:sync, true}, {:stdout, true}]
-
   def ffmpeg_resize_remote(uri, %{max_width: max_width, max_height: max_height}) do
     cmd = ~s"""
     curl -L "#{uri}" |
@@ -20,7 +18,7 @@ defmodule Pleroma.Helpers.MediaHelper do
     cat
     """
 
-    with {:ok, [stdout: stdout_list]} <- Exexec.run(cmd, @ffmpeg_opts) do
+    with {:ok, [stdout: stdout_list]} <- Pleroma.Exec.cmd(cmd) do
       {:ok, Enum.join(stdout_list)}
     end
   end