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diff --git a/src/rebar3.erl b/src/rebar3.erl
index 47dc25a..edda250 100644
--- a/src/rebar3.erl
+++ b/src/rebar3.erl
@@ -304,9 +304,11 @@ start_and_load_apps(Caller) ->
ensure_running(crypto, Caller),
ensure_running(asn1, Caller),
ensure_running(public_key, Caller),
- ensure_running(ssl, Caller),
- inets:start(),
- inets:start(httpc, [{profile, rebar}]).
+ ensure_running(ssl, Caller).
+%% Removed due to the hermicity requirements of Nix
+%%
+%% inets:start(),
+%% inets:start(httpc, [{profile, rebar}]).
ensure_running(App, Caller) ->
case application:start(App) of
diff --git a/src/rebar_hermeticity.erl b/src/rebar_hermeticity.erl
new file mode 100644
index 0000000..8f6cc7d
--- /dev/null
+++ b/src/rebar_hermeticity.erl
@@ -0,0 +1,42 @@
+%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
+%% ex: ts=4 sw=4 et
+%% -------------------------------------------------------------------
+%%
+%% rebar: Erlang Build Tools
+%%
+%% Copyright (c) 2016 Eric Merritt (eric@merritt.tech)
+%%
+%% Permission is hereby granted, free of charge, to any person obtaining a copy
+%% of this software and associated documentation files (the "Software"), to deal
+%% in the Software without restriction, including without limitation the rights
+%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+%% copies of the Software, and to permit persons to whom the Software is
+%% furnished to do so, subject to the following conditions:
+%%
+%% The above copyright notice and this permission notice shall be included in
+%% all copies or substantial portions of the Software.
+%%
+%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+%% THE SOFTWARE.
+%% -------------------------------------------------------------------
+-module(rebar_hermeticity).
+
+-export([request/5]).
+
+-include("rebar.hrl").
+
+%% ====================================================================
+%% Public API
+%% ====================================================================
+
+request(Method, {Url, _Headers}, _HTTPOptions, _Options, _Profile) ->
+ ?ERROR("A request is being made that violates Nix hermicity "
+ "This request has been stopped. Details of the request "
+ "are as follows:", []),
+ ?ERROR("Request: ~p ~s", [Method, Url]),
+ erlang:halt(1).
diff --git a/src/rebar_pkg_resource.erl b/src/rebar_pkg_resource.erl
index 5817817..2ea1703 100644
--- a/src/rebar_pkg_resource.erl
+++ b/src/rebar_pkg_resource.erl
@@ -107,7 +107,7 @@ make_vsn(_) ->
{error, "Replacing version of type pkg not supported."}.
request(Url, ETag) ->
- case httpc:request(get, {Url, [{"if-none-match", ETag} || ETag =/= false]++[{"User-Agent", rebar_utils:user_agent()}]},
+ case rebar_hermeticity:request(get, {Url, [{"if-none-match", ETag} || ETag =/= false]++[{"User-Agent", rebar_utils:user_agent()}]},
[{ssl, ssl_opts(Url)}, {relaxed, true}],
[{body_format, binary}],
rebar) of
diff --git a/src/rebar_prv_update.erl b/src/rebar_prv_update.erl
index 75c609e..4283c23 100644
--- a/src/rebar_prv_update.erl
+++ b/src/rebar_prv_update.erl
@@ -52,7 +52,7 @@ do(State) ->
case rebar_utils:url_append_path(CDN, ?REMOTE_REGISTRY_FILE) of
{ok, Url} ->
?DEBUG("Fetching registry from ~p", [Url]),
- case httpc:request(get, {Url, [{"User-Agent", rebar_utils:user_agent()}]},
+ case rebar_hermeticity:request(get, {Url, [{"User-Agent", rebar_utils:user_agent()}]},
[], [{stream, TmpFile}, {sync, true}],
rebar) of
{ok, saved_to_file} ->
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