From 8cf7d8c488cc24334a0022cfc9b89fe95659ec52 Mon Sep 17 00:00:00 2001
From: Samuel Giddins <segiddins@segiddins.me>
Date: Fri, 10 Feb 2017 09:57:59 -0800
Subject: [Settings] Allow not reading the global config file when there is no
 $HOME and $TMPDIR is not writable

---
 lib/bundler.rb                |  2 +-
 lib/bundler/settings.rb       |  6 +++++-
 spec/bundler/settings_spec.rb | 13 +++++++++++++
 3 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/lib/bundler.rb b/lib/bundler.rb
index c98dece747..914bdb3762 100644
--- a/lib/bundler.rb
+++ b/lib/bundler.rb
@@ -176,7 +176,7 @@ module Bundler
         tmp_home_path.join(login).tap(&:mkpath)
       end
     rescue => e
-      raise "#{warning}\nBundler also failed to create a temporary home directory at `#{path}':\n#{e}"
+      raise e.exception("#{warning}\nBundler also failed to create a temporary home directory at `#{path}':\n#{e}")
     end
 
     def user_bundle_path
diff --git a/lib/bundler/settings.rb b/lib/bundler/settings.rb
index e98940721e..7339f721ad 100644
--- a/lib/bundler/settings.rb
+++ b/lib/bundler/settings.rb
@@ -285,7 +285,11 @@ module Bundler
       if ENV["BUNDLE_CONFIG"] && !ENV["BUNDLE_CONFIG"].empty?
         Pathname.new(ENV["BUNDLE_CONFIG"])
       else
-        Bundler.user_bundle_path.join("config")
+        begin
+          Bundler.user_bundle_path.join("config")
+        rescue PermissionError, GenericSystemCallError
+          nil
+        end
       end
     end
 
diff --git a/spec/bundler/settings_spec.rb b/spec/bundler/settings_spec.rb
index c67ae81bac..020897882c 100644
--- a/spec/bundler/settings_spec.rb
+++ b/spec/bundler/settings_spec.rb
@@ -62,6 +62,19 @@ that would suck --ehhh=oh geez it looks like i might have broken bundler somehow
     end
   end
 
+  describe "#global_config_file" do
+    context "when $HOME is not accessible" do
+      context "when $TMPDIR is not writable" do
+        it "does not raise" do
+          expect(Bundler.rubygems).to receive(:user_home).twice.and_return(nil)
+          expect(FileUtils).to receive(:mkpath).twice.with(File.join(Dir.tmpdir, "bundler", "home")).and_raise(Errno::EROFS, "Read-only file system @ dir_s_mkdir - /tmp/bundler")
+
+          expect(subject.send(:global_config_file)).to be_nil
+        end
+      end
+    end
+  end
+
   describe "#[]" do
     context "when the local config file is not found" do
       subject(:settings) { described_class.new }
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