Add files for WSL GPG forwarding

bin/wsl-gpg-agent-relay.sh

···
+#!/bin/bash
+# Launches socat+npiperelay to relay the gpg-agent socket file for use in WSL
+# See https://justyn.io/blog/using-a-yubikey-for-gpg-in-windows-10-wsl-windows-subsystem-for-linux/ for details
+
+GPGDIR="${HOME}/.gnupg"
+WINDOWS_USERNAME=adamh
+WSL_USERNAME=sharparam
+WIN_GPGDIR="C:/Users/${WINDOWS_USERNAME}/AppData/Roaming/gnupg"
+NPIPERELAY="/mnt/e/apps/npiperelay.exe"
+PIDFILE="${GPGDIR}/.gpg-agent-relay.pid"
+OLDPID=$(cat "${PIDFILE}" 2>/dev/null)
+
+# Launch socat+npiperelay for the regular gpg-agent
+if [ ! -z "${OLDPID}" ]; then
+  ps -p "${OLDPID}" >/dev/null && \
+    echo "gpg-agent-relay.sh already running with process id $(cat ${PIDFILE})" && \
+    exit 0
+fi
+
+rm -f "${GPGDIR}/S.gpg-agent*"
+echo $$ > ${PIDFILE}
+
+# Relay the regular gpg-agent socket for gpg operations
+socat UNIX-LISTEN:"${GPGDIR}/S.gpg-agent,fork" EXEC:"${NPIPERELAY} -ep -ei -s -a '${WIN_GPGDIR}/S.gpg-agent'",nofork &
+AGENTPID=$!
+
+# Relay the gpg ssh-agent
+socat UNIX-LISTEN:"${GPGDIR}/S.gpg-agent.ssh,fork" EXEC:"${NPIPERELAY} -ep -ei -s -a '${WIN_GPGDIR}/S.gpg-agent.ssh'",nofork &
+SSHPID=$!
+
+wait ${AGENTPID}
+wait ${SSHPID}

zsh/.zshrc

···
 fi
 
 export GPG_TTY="$(tty)"
-unset SSH_AGENT_PID
-export SSH_AUTH_SOCK=$(gpgconf --list-dirs agent-ssh-socket)
-gpgconf --launch gpg-agent
+if [[ $is_wsl ]]; then
+  wsl_gpg_agent_relay="$HOME/.local/bin/wsl-gpg-agent-relay.sh"
+  if [[ -f "$wsl_gpg_agent_relay" ]]; then
+    echo '[WSL] Launching WSL GPG agent relay'
+    $wsl_gpg_agent_relay &
+  else
+    echo "[WSL] Missing: ${wsl_gpg_agent_relay}"
+  fi
+  unset SSH_AGENT_PID
+  export SSH_AUTH_SOCK=$HOME/.local/wsl-ssh-pageant/ssh-agent.sock
+else
+  unset SSH_AGENT_PID
+  export SSH_AUTH_SOCK=$(gpgconf --list-dirs agent-ssh-socket)
+  gpgconf --launch gpg-agent
+fi
+
+if [[ -d '/usr/local/go/bin' ]]; then
+  path=("$path[@]" /usr/local/go/bin)
+fi
+#export GOPATH="$HOME/go"
 
 # tmux helpers
 ts() {