Add arm? helper to chef-utils

It's tagged as first shipping in chef 15.10 since I plan to backport this and that'll make sense in the docs.

Signed-off-by: Tim Smith <tsmith@chef.io>

3 files changed, 24 insertions, 9 deletions

diff --git a/chef-utils/README.md b/chef-utils/README.md
index e44d4d6937..fb5dd98b07 100644
--- a/chef-utils/README.md
+++ b/chef-utils/README.md
@@ -108,17 +108,21 @@ The OS helpers provide an alternative to comparing data from `node['os']`.
 
 Architecture Helpers allow you to determine the processor architecture of your node.
 
-* `_64_bit?`
 * `_32_bit?`
+* `_64_bit?`
+* `aarch64?`
+* `arch64?`
+* `arm64?`
+* `arm?`
+* `armhf?`
 * `i386?`
 * `intel?`
-* `sparc?`
+* `powerpc?`
 * `ppc64?`
 * `ppc64le?`
-* `powerpc?`
-* `armhf?`
-* `s390x?`
 * `s390?`
+* `s390x?`
+* `sparc?`
 
 ### Cloud Helpers
 
diff --git a/chef-utils/lib/chef-utils/dsl/architecture.rb b/chef-utils/lib/chef-utils/dsl/architecture.rb
index d20c6c5a76..30e908d694 100644
--- a/chef-utils/lib/chef-utils/dsl/architecture.rb
+++ b/chef-utils/lib/chef-utils/dsl/architecture.rb
@@ -103,6 +103,17 @@ module ChefUtils
         %w{powerpc}.include?(node["kernel"]["machine"])
       end
 
+      # Determine if the current architecture is arm
+      #
+      # @since 15.10
+      #
+      # @return [Boolean]
+      #
+      def arm?(node = __getnode)
+        %w{armhf aarch64 arm64 arch64}
+        .include?(node["kernel"]["machine"])
+      end
+
       # Determine if the current architecture is 32-bit ARM.
       #
       # @since 15.5
diff --git a/chef-utils/spec/unit/dsl/architecture_spec.rb b/chef-utils/spec/unit/dsl/architecture_spec.rb
index a2ce300fe0..c43b2d0733 100644
--- a/chef-utils/spec/unit/dsl/architecture_spec.rb
+++ b/chef-utils/spec/unit/dsl/architecture_spec.rb
@@ -84,17 +84,17 @@ RSpec.describe ChefUtils::DSL::Architecture do
   context "on aarch64" do
     let(:arch) { "aarch64" }
 
-    arch_reports_true_for(:_64_bit?)
+    arch_reports_true_for(:_64_bit?, :arm?)
   end
   context "on arch64" do
     let(:arch) { "arch64" }
 
-    arch_reports_true_for(:_64_bit?)
+    arch_reports_true_for(:_64_bit?, :arm?)
   end
   context "on arm64" do
     let(:arch) { "arm64" }
 
-    arch_reports_true_for(:_64_bit?)
+    arch_reports_true_for(:_64_bit?, :arm?)
   end
   context "on sun4v" do
     let(:arch) { "sun4v" }
@@ -129,7 +129,7 @@ RSpec.describe ChefUtils::DSL::Architecture do
   context "on armhf" do
     let(:arch) { "armhf" }
 
-    arch_reports_true_for(:armhf?, :_32_bit?)
+    arch_reports_true_for(:armhf?, :_32_bit?, :arm?)
   end
   context "on s390" do
     let(:arch) { "s390" }