Merge branch 'develop' into feature/gen-magic

[akkoma] / lib / pleroma / utils.ex

diff --git a/lib/pleroma/utils.ex b/lib/pleroma/utils.ex
index 8d36a0001fa5e8ab5e50fef0d32b85ce8f131bf9..21d1159be84383426262ee49bb7d4758dccb3523 100644 (file)
--- a/lib/pleroma/utils.ex
+++ b/lib/pleroma/utils.ex
@@ -1,5 +1,5 @@
 # Pleroma: A lightweight social networking server
-# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Utils do
@@ -9,4 +9,19 @@ defmodule Pleroma.Utils do
     |> Enum.map(&Path.join(dir, &1))
     |> Kernel.ParallelCompiler.compile()
   end
+
+  @doc """
+  POSIX-compliant check if command is available in the system
+
+  ## Examples
+      iex> command_available?("git")
+      true
+      iex> command_available?("wrongcmd")
+      false
+
+  """
+  @spec command_available?(String.t()) :: boolean()
+  def command_available?(command) do
+    match?({_output, 0}, System.cmd("sh", ["-c", "command -v #{command}"]))
+  end
 end