debian buster - multiuser install procedure fails due to proxy

[markgalassi]

I think you need "sudo -E" in your install scripts. I get this error when following your multiuser procedure:

$ sh <(curl https://nixos.org/nix/install) --daemon

eventually gives this:

---- sudo execution ------------------------------------------------------------
I am executing:

    $ sudo HOME=/root NIX_SSL_CERT_FILE=/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt /nix/store/hbhdjn5ik3byg642d1m11k3k3s0kn3py-nix-2.2.2/bin/nix-channel --update nixpkgs

to update the default channel in the default profile

warning: unable to download 'https://nixos.org/channels/nixpkgs-unstable': Couldn't connect to server (7); retrying in 319 ms
warning: unable to download 'https://nixos.org/channels/nixpkgs-unstable': Couldn't connect to server (7); retrying in 687 ms
warning: unable to download 'https://nixos.org/channels/nixpkgs-unstable': Couldn't connect to server (7); retrying in 1365 ms
warning: unable to download 'https://nixos.org/channels/nixpkgs-unstable': Couldn't connect to server (7); retrying in 2318 ms
error: unable to download 'https://nixos.org/channels/nixpkgs-unstable': Couldn't connect to server (7)

---- oh no! --------------------------------------------------------------------
Jeeze, something went wrong. If you can take all the output and open
an issue, we'd love to fix the problem so nobody else has this issue.

:(

We'd love to help if you need it.

If you can, open an issue at https://github.com/nixos/nix/issues

A workaround is to put this line into /etc/sudoers:

Defaults        env_reset
Defaults env_keep = "http_proxy HTTP_PROXY https_proxy HTTPS_PROXY ftp_proxy"

Some info about the system:

$ printenv | grep -i proxy
no_proxy=localhost,lanl.gov
https_proxy=http://proxyout.mydomain:8080
NO_PROXY=localhost,mydomain
HTTPS_PROXY=http://proxyout.mydomain:8080
HTTP_PROXY=http://proxyout.mydomain:8080
http_proxy=http://proxyout.mydomain:8080

$ uname -a
Linux rocketchat 4.19.0-5-amd64 #1 SMP Debian 4.19.37-5 (2019-06-19) x86_64 GNU/Linux

$ lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 10 (buster)
Release: 10
Codename: buster

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