Start tracking which store paths are in use

This will enable garbage collection of the Guix store, without
removing things that are still in use.

1 files changed, 22 insertions, 0 deletions

diff --git a/app/models/backends/terraform_aws/backend_methods.rb b/app/models/backends/terraform_aws/backend_methods.rb
index cc5ca62..d6665a1 100644
--- a/app/models/backends/terraform_aws/backend_methods.rb
+++ b/app/models/backends/terraform_aws/backend_methods.rb
@@ -80,6 +80,28 @@ module Backends::TerraformAws::BackendMethods
     end
   end
 
+  def in_use_store_paths
+    [
+      GovukGuix::Revision.pluck(:store_path),
+      available_data_snapshots.pluck(:store_path),
+      mini_environments.pluck(:backend_data).map { |x| x&.dig('build_output') }
+    ].flatten.compact
+  end
+
+  def update_guix_gcroots
+    GovukGuix::UpdateGcrootsDirectory.set_in_use_store_paths(
+      in_use_store_paths,
+      run_remotely_on_host: build_remote_host
+    )
+  end
+
+  def add_in_use_store_path(store_path)
+    GovukGuix::UpdateGcrootsDirectory.add_store_path(
+      store_path,
+      run_remotely_on_host: build_remote_host
+    )
+  end
+
   def within_backend_terraform_working_directory(&block)
     with_advisory_lock(
       "terraform"