package: Add fetch_options variable (#15317)

PR #15212 added a new connect_timeout option that can be overridden
using fetch_options but had to specified per-version. This adds a new
per-package variable that can be used to override fetch_options for
all versions in the package. This includes connect_timeout as well
as 'cookie' (e.g. for the jdk package).

Packages can combine package-level fetch_options with per-version
fetch_options, in which case the version fetch_options completely
override the package-level fetch_options.

This commit includes tests for the added behavior.

1 files changed, 22 insertions, 0 deletions

diff --git a/var/spack/repos/builtin.mock/packages/fetch-options/package.py b/var/spack/repos/builtin.mock/packages/fetch-options/package.py
new file mode 100644
index 0000000000..1a31a535e1
--- /dev/null
+++ b/var/spack/repos/builtin.mock/packages/fetch-options/package.py
@@ -0,0 +1,22 @@
+# Copyright 2013-2020 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+
+
+class FetchOptions(Package):
+    """Mock package with fetch_options."""
+
+    homepage = "http://www.fetch-options-example.com"
+
+    url = 'https://example.com/some/tarball-1.0.tar.gz'
+
+    fetch_options = {'timeout': 42, 'cookie': 'foobar'}
+    timeout = {'timeout': 65}
+    cookie = {'cookie': 'baz'}
+
+    version('1.2', 'abc12', fetch_options=cookie)
+    version('1.1', 'abc11', fetch_options=timeout)
+    version('1.0', 'abc10')