Overwriting a component version doesn't overwrite the generated download URL.

Consider a simple setup such as

node.override["prometheus-platform"]["components"]["prometheus"]["version"] = "2.27.1"
node.override["prometheus-platform"]["components"]["prometheus"]["sha"] = "ce637d0167d5e6d2561f3bd37e1c58fe8601e13e4e1ea745653c068f6e1317ae"
node.override["prometheus-platform"]["components"]["prometheus"]["install?"] = true

include_recipe "prometheus-platform"

On current master, this overwrites the 2.17.2 version:

  'prometheus' => {
    'install?' => false,
    'version' => '2.17.2',
    'sha' => 'a8ca17b845df4967ff5ef9f9b2c7c98568104e777c9f9a4eb1bc409726089626'
  },

The above fails to install: the attributes get overwritten but the download still happens with the default version.

             System Info:
             ------------
             chef_version=16.12.3
             platform=ubuntu
             platform_version=16.04
             ruby=ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x86_64-linux]
             program_name=/opt/chef/bin/chef-client
             executable=/opt/chef/bin/chef-client
             
           
           ================================================================================
           Error executing action `install` on resource 'ark[prometheus]'
           ================================================================================
           
           Chef::Exceptions::ChecksumMismatch
           ----------------------------------
           remote_file[/tmp/kitchen/cache/prometheus-2.27.1.tar.gz] (/tmp/kitchen/cache/cookbooks/ark/resources/default.rb line 64) had an error: Chef::Exceptions::ChecksumMismatch: Checksum on resource (ce637d...) does not match checksum on content (a8ca17...)

We can see that this is what's happening by looking a bit more down on in the chef-client log:

           Compiled Resource:
           ------------------
           # Declared in /tmp/kitchen/cache/cookbooks/prometheus-platform/recipes/install.rb:45:in `block in from_file'
           
           ark("prometheus") do
             action [:install]
             updated true
             updated_by_last_action true
             default_guard_interpreter :default
             declared_type :ark
             cookbook_name "prometheus-platform"
             recipe_name "install"
             url "https://github.com/prometheus/prometheus/releases/download/v2.17.2/prometheus-2.17.2.linux-amd64.tar.gz"
             prefix_root "/opt"
             prefix_home "/opt"
             prefix_bin "/opt/bin"
             has_binaries []
             checksum "ce637d0167d5e6d2561f3bd37e1c58fe8601e13e4e1ea745653c068f6e1317ae"
             version "2.27.1"
             extension "tar.gz"
             home_dir "/opt/prometheus"
             owner "root"
             path "/opt/prometheus-2.27.1"
             release_file "/tmp/kitchen/cache/prometheus-2.27.1.tar.gz"
           end

Note the url parameter.

This is not the end of the world as we can build and set the URL ourselves.

def install_prometheus_component(component_name, version, sha)
  node.override["prometheus-platform"]["components"][component_name]["version"] = version
  node.override["prometheus-platform"]["components"][component_name]["sha"] = sha
  node.override["prometheus-platform"]["components"][component_name]["install?"] = true
  node.override["prometheus-platform"]["components"][component_name]["url"] =
    "https://github.com/prometheus/#{component_name}/releases/download/v#{version}/#{component_name}-#{version}.linux-amd64.tar.gz"
end

install_prometheus_component("prometheus", "2.27.1", "ce637d0167d5e6d2561f3bd37e1c58fe8601e13e4e1ea745653c068f6e1317ae")

# whatever other components you may want go here
# …

include_recipe "prometheus-platform"