1 files changed, 29 insertions, 0 deletions
diff --git a/lib/pleroma/utils.ex b/lib/pleroma/utils.ex
index 6b8e3accf..fef9b6cc8 100644
--- a/lib/pleroma/utils.ex
+++ b/lib/pleroma/utils.ex
@@ -9,4 +9,33 @@ 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
+
+  @doc """
+  Throws an exception in case required command is not available
+  """
+  @spec command_required!(String.t()) :: :ok | no_return()
+  def command_required!(command) do
+    case command_available?(command) do
+      true ->
+        :ok
+
+      false ->
+        raise "Command #{command} is required, but not available in $PATH"
+    end
+  end
 end