dev-cmd: add brew verify

Library/Homebrew/dev-cmd/verify.rb

@@ -0,0 +1,87 @@
+# typed: strict
+# frozen_string_literal: true
+
+require "abstract_command"
+require "formula"
+require "date"
+require "attestation"
+
+module Homebrew
+  module DevCmd
+    class VerifyCmd < AbstractCommand
+      cmd_args do
+        description <<~EOS
+          Verify the build provenance of bottles using GitHub's attestation tools.
+          This is done by first fetching the given bottles, and then verifying
+          their provenance.
+
+          Note that this command depends on the GitHub CLI. Run `brew install gh`.
+        EOS
+        flag   "--os=",
+               description: "Download for the given operating system." \
+                            "(Pass `all` to download for all operating systems.)"
+        flag   "--arch=",
+               description: "Download for the given CPU architecture." \
+                            "(Pass `all` to download for all architectures.)"
+        flag   "--bottle-tag=",
+               description: "Download a bottle for given tag."
+        switch "--deps",
+               description: "Also download dependencies for any listed <formula>."
+        switch "-f", "--force",
+               description: "Remove a previously cached version and re-fetch."
+        switch "-j", "--json",
+               description: "Return JSON for the attestation data for each bottle."
+        conflicts "--os", "--bottle-tag"
+        conflicts "--arch", "--bottle-tag"
+        named_args [:formula], min: 1
+      end
+
+      sig { override.void }
+      def run
+        bucket = if args.deps?
+          args.named.to_formulae.flat_map do |formula|
+            [formula, *formula.recursive_dependencies.map(&:to_formula)]
+          end
+        else
+          args.named.to_formulae
+        end.uniq
+
+        os_arch_combinations = args.os_arch_combinations
+        json_results = []
+        bucket.each do |formula|
+          os_arch_combinations.each do |os, arch|
+            SimulateSystem.with(os:, arch:) do
+              bottle_tag = if (bottle_tag = args.bottle_tag&.to_sym)
+                Utils::Bottles::Tag.from_symbol(bottle_tag)
+              else
+                Utils::Bottles::Tag.new(system: os, arch:)
+              end
+
+              bottle = formula.bottle_for_tag(bottle_tag)
+
+              if bottle.nil?
+                opoo "Bottle for tag #{bottle_tag.to_sym.inspect} is unavailable."
+                next
+              end
+              bottle.clear_cache if args.force?
+              bottle.fetch
+              begin
+                attestation = Homebrew::Attestation.check_core_attestation bottle
+                oh1 "#{bottle.filename} has a valid attestation"
+                json_results.push(attestation)
+              rescue Homebrew::Attestation::InvalidAttestationError => e
+                ofail <<~ERR
+                  Failed to verify #{bottle.filename} with tag #{bottle_tag} due to error:
+
+                  #{e}
+                ERR
+              end
+            end
+          end
+        end
+
+        puts json_results.to_json if args.json?
+      end
+    end
+  end
+end