Fix commands failing when current directory path contains spaces

lib/litestream/commands.rb

@@ -1,4 +1,5 @@
 require_relative "upstream"
+require "shellwords"
 
 module Litestream
   module Commands
@@ -162,7 +163,7 @@ def prepare(command, argv = {}, database = nil)
       end
 
       def run(cmd, tabled_output:)
-        stdout = `#{cmd.join(" ")}`.chomp
+        stdout = `#{Shellwords.shelljoin(cmd)}`.chomp
         return stdout unless tabled_output
 
         keys, *rows = stdout.split("\n").map { _1.split(/\s+/) }

test/litestream/test_commands.rb

@@ -840,6 +840,54 @@ def test_wal_does_not_set_env_var_from_config_when_env_vars_already_set
     end
   end
 
+  class TestRunMethod < TestCommands
+    def test_run_method_handles_paths_with_spaces
+      # Create a command with a path containing spaces
+      cmd = ["/usr/bin/echo", "hello world", "/path with spaces/file.txt"]
+
+      # Stub the backtick execution to capture what would be executed
+      executed_command = nil
+      stubbed_backticks = proc do |command_string|
+        executed_command = command_string
+        "mocked output"
+      end
+
+      # Test that the command is properly escaped
+      Litestream::Commands.stub :`, stubbed_backticks do
+        result = Litestream::Commands.send(:run, cmd, tabled_output: false)
+
+        # The result should be the mocked output
+        assert_equal "mocked output", result
+
+        # Check that the executed command is properly escaped
+        # With fixed implementation using Shellwords.shelljoin
+        # This ensures spaces are properly handled
+        expected_command = "/usr/bin/echo hello\\ world /path\\ with\\ spaces/file.txt"
+        assert_equal expected_command, executed_command
+      end
+    end
+
+    def test_run_method_handles_simple_commands_without_spaces
+      # Test that simple commands still work
+      cmd = ["/usr/bin/echo", "hello", "world"]
+
+      executed_command = nil
+      stubbed_backticks = proc do |command_string|
+        executed_command = command_string
+        "simple output"
+      end
+
+      Litestream::Commands.stub :`, stubbed_backticks do
+        result = Litestream::Commands.send(:run, cmd, tabled_output: false)
+
+        assert_equal "simple output", result
+        # Simple commands should still work fine
+        expected_command = "/usr/bin/echo hello world"
+        assert_equal expected_command, executed_command
+      end
+    end
+  end
+
   class TestOutput < ActiveSupport::TestCase
     def test_output_formatting_generates_table_with_data
       data = [