core: don't load curlrc [GH-4328]

CHANGELOG.md

@@ -34,6 +34,8 @@ BUG FIXES:
   - core: Fix crash case when destroying with an invalid provisioner. [GH-4281]
   - core: Box names with colons work on Windows. [GH-4100]
   - core: Cleanup all temp files. [GH-4103]
+  - core: User curlrc is not loaded, preventing strange download issues.
+      [GH-4328]
   - commands/package: base package won't crash with exception [GH-4017]
   - commands/rsync-auto: Destroyed machines won't raise exceptions. [GH-4031]
   - communicators/ssh: Nicer error if remote unexpectedly disconects. [GH-4038]

lib/vagrant/util/downloader.rb

@@ -189,6 +189,7 @@ module Vagrant
       def options
         # Build the list of parameters to execute with cURL
         options = [
+          "-q",
           "--fail",
           "--location",
           "--max-redirs", "10",

test/unit/vagrant/util/downloader_test.rb

@@ -22,7 +22,7 @@ describe Vagrant::Util::Downloader do
 
   describe "#download!" do
     let(:curl_options) {
-      ["--fail", "--location", "--max-redirs", "10",
+      ["-q", "--fail", "--location", "--max-redirs", "10",
        "--user-agent", described_class::USER_AGENT,
        "--output", destination, source, {}]
     }
@@ -76,7 +76,7 @@ describe Vagrant::Util::Downloader do
 
   describe "#head" do
     let(:curl_options) {
-      ["--fail", "--location", "--max-redirs", "10", "--user-agent", described_class::USER_AGENT, source, {}]
+      ["-q", "--fail", "--location", "--max-redirs", "10", "--user-agent", described_class::USER_AGENT, source, {}]
     }
 
     it "returns the output" do