query replication status when WAL-E is used

Hi all,

I need to have a way to query a streaming replication status from the
client (Web app), on a secondary node. It can be easily done now by
performing a query "select pid, status from pg_stat_wal_receiver". The
problem is that sometimes we need to use WAL-E replication and in this
case, it's impossible to get the status using SQL command. As WAL-E
essentially uses archive_command/restore_command, I would like to be able
to see the content of the restore_command in recovery.conf file using SQL
command. Keep in mind that I CAN see the archive_command value by using
whether "SELECT ALL" or "SELECT * FROM pg_settings"What do you think?