use YAML.unsafe_load in Psych 4.x (Ruby 3.1+)

Psych 4.x defaults to "nanny mode" to handle untrusted data.
This causes breakage with since YAML references (aliases)
emitted by dtas-player can't be handled by Psych clients under
Ruby 3.1.  Since dtas is single user and is a shell designed to
run arbitrary code, favor the new YAML.unsafe_load API which
behaves like the old YAML.load in Ruby <= 3.0.

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/dtas.rb b/lib/dtas.rb
index 477a176..cb7c33d 100644
--- a/lib/dtas.rb
+++ b/lib/dtas.rb
@@ -25,6 +25,12 @@ module DTAS
       Fiddle.dlopen(nil)
     end
   end
+
+  # prevent breakage in Psych 4.x; we're a shell and designed to execute code
+  def self.yaml_load(buf)
+    require 'yaml'
+    YAML.respond_to?(:unsafe_load) ? YAML.unsafe_load(buf) : YAML.load(buf)
+  end
   # :startdoc:
 end