gpg: check that the configuration is in place

scripts/gpg-shell

@@ -5,6 +5,13 @@ gpg2 --version >/dev/null  # verify that GnuPG 2 is installed
 
 export GNUPGHOME=~/.gnupg/trezor
 
+CONFIG_PATH="${GNUPGHOME}/gpg-agent.conf"
+if [ ! -f ${CONFIG_PATH} ]
+then
+	echo "No configuration found: ${CONFIG_PATH}"
+	exit 1
+fi
+
 # Make sure that the device is unlocked before starting the shell
 trezor-gpg-unlock
 

trezor_agent/gpg/__main__.py

@@ -92,6 +92,10 @@ def main_agent():
     """Run a simple GPG-agent server."""
     home_dir = os.environ.get('GNUPGHOME', os.path.expanduser('~/.gnupg/trezor'))
     config_file = os.path.join(home_dir, 'gpg-agent.conf')
+    if not os.path.exists(config_file):
+        msg = 'No configuration file found: {}'.format(config_file)
+        raise IOError(msg)
+
     lines = (line.strip() for line in open(config_file))
     lines = (line for line in lines if line and not line.startswith('#'))
     config = dict(line.split(' ', 1) for line in lines)