(address . bug-guix@gnu.org)
It would be very useful to be able to tell guix-daemon to download
sources and substitutes through a proxy, even when using ftp. Even
more so than http, as ftp is easily messed up by NAT and "helpful"
Application-Level Gateways.
The format of the ftp_proxy environment variable is the same as for
http_proxy, and indicates that an HTTP proxy be used for FTP
transfers.