test: Use dummy pinentry program

We can't simply use loopback pinentry in our CI, because the gpg2
command installed on travis is too old to support it.  Instead, import
the dummy pinentry hack from the GPGME test suite.

.travis.yml

@@ -22,6 +22,9 @@ before_install:
   - sudo mknod -m 0666 /dev/random c 1 9
   - echo HRNGDEVICE=/dev/urandom | sudo tee /etc/default/rng-tools
   - sudo /etc/init.d/rng-tools restart
+  - gpg --version
+  - gpg2 --version
+  - gpgconf --list-options gpg-agent
 
 script: travis_wait bundle exec rake TESTOPTS="-v"
 

test/pinentry

@@ -0,0 +1,22 @@
+#! /bin/bash
+# Dummy pinentry
+# 
+# Copyright 2008 g10 Code GmbH
+# 
+# This file is free software; as a special exception the author gives
+# unlimited permission to copy and/or distribute it, with or without
+# modifications, as long as this notice is preserved.
+# 
+# This file is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+# PURPOSE.
+
+echo OK Your orders please
+
+while read cmd; do
+  case $cmd in
+    GETPIN) echo D gpgme; echo OK;;
+    *) echo OK;;
+  esac
+done

test/test_helper.rb

@@ -99,11 +99,16 @@ def ensure_keys(proto)
     # We use a different home directory for the keys to not disturb current
     # installation
     require 'tmpdir'
+    require 'pathname'
 
     if DIRS.empty?
       dir = Dir.mktmpdir
       GPGME::Engine.home_dir = dir
       DIRS.push(dir)
+      pinentry = Pathname.new(__FILE__).dirname + 'pinentry'
+      gpg_agent_conf = Pathname.new(dir) + 'gpg-agent.conf'.open('w+') {|io|
+        io.write("pinentry-program #{pinentry}\n")
+      }
       remove_all_keys
       import_keys
     end