#!/bin/sh

# Copyright (C) 2013 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.

if [ -z "$(command -v gpg-connect-agent)" ]; then

   echo "gpg-agent not installed and thus not started" >&2

   exit 0;

fi

GPG_AGENT_INFO=

export GPG_AGENT_INFO

GPG_AGENT=$(which gpg-agent)

token=$(echo "gpgme-$(pwd)" | tr ' ' '_')

if [ "$1" = "--stop" ]; then

  if [ "$(gpg-connect-agent --no-autostart getval\ $token /bye 2>/dev/null | head -1)" \

        != "D set" ]; then

    echo "gpg-agent not running" >&2

    exit 0

  fi

  echo "stopping gpg-agent " >&2

  gpg-connect-agent KILLAGENT /bye >/dev/null 2>&1

  exit 0

fi

# Update 'agent-program' in the configuration files to make sure we

# will always start exactly this agent again if we ever need to.

for F in gpg.conf gpgsm.conf

do

  if test -f "$GNUPGHOME/$F"

  then

      mv "$GNUPGHOME/$F" "$GNUPGHOME/$F~"

      sed -e "s#^agent-program.*#agent-program ${GPG_AGENT}|--debug-quick-random#" \

          >"$GNUPGHOME/$F" <"$GNUPGHOME/$F~"

      rm "$GNUPGHOME/$F~"

  fi

done

if [ "$(gpg-connect-agent --no-autostart getval\ $token /bye 2>/dev/null | head -1)" \

      = "D set" ]; then

  echo "gpg-agent already running" >&2

  exit 0

fi

echo "starting gpg-agent.." >&2

# GnuPG prior to 2.1.12 needs --allow-loopback-pinentry for the

# loopback entry to work.  Old versions do not understand this though,

# so we need to be careful.

if "$GPG_AGENT" --gpgconf-test --allow-loopback-pinentry &&

      test -f "$GNUPGHOME/gpg-agent.conf" &&

      ! grep -q allow-loopback-pinentry "$GNUPGHOME/gpg-agent.conf"; then

    echo allow-loopback-pinentry >> "$GNUPGHOME/gpg-agent.conf"

fi

gpg-connect-agent --agent-program="${GPG_AGENT}|--debug-quick-random" putval\ $token\ set /bye

if [ $? -ne 0 -o "$(gpg-connect-agent getval\ $token /bye 2>/dev/null | head -1)" \

      != "D set" ]; then

  echo "error starting gpg-agent" >&2

  exit 1

fi

exit 0