GitHub Packages cleanup

- `download_strategy`: only request image index JSON for downloading
  the manifest for the tab
- use a shared `OS` constant for the version of `glibc` we use in CI
- fix `skoepeo` typo
- ensure that blank hash values are deleted (again) rather than just
  `nil` ones
- use a shared `Hardware::CPU` constant for oldest CPU we're
  supporting/using on Intel 64-bit
- re-add comment to `software_spec`

Library/Homebrew/download_strategy.rb

@@ -563,7 +563,8 @@ class CurlGitHubPackagesDownloadStrategy < CurlDownloadStrategy
 
   def initialize(url, name, version, **meta)
     meta ||= {}
-    meta[:header] = ["Authorization: Bearer", "Accept: application/vnd.oci.image.index.v1+json"]
+    meta[:headers] ||= []
+    meta[:headers] << ["Authorization: Bearer"]
     super(url, name, version, meta)
   end
 

Library/Homebrew/formula_auditor.rb

@@ -343,7 +343,7 @@ module Homebrew
       return unless @core_tap
 
       version = formula.version.to_s
-      return if version == "2.23"
+      return if version == OS::GLIBC_CI_VERSION
 
       problem "The glibc version must be #{version}, as this is the version used by our CI on Linux. " \
               "Glibc is for users who have a system Glibc with a lower version, " \

Library/Homebrew/github_packages.rb

@@ -58,7 +58,7 @@ class GitHubPackages
       HOMEBREW_PREFIX/"bin/skopeo",
     ].compact.first
     unless skopeo.exist?
-      odie "no `skoepeo` and HOMEBREW_FORCE_HOMEBREW_ON_LINUX is set!" if Homebrew::EnvConfig.force_homebrew_on_linux?
+      odie "no `skopeo` and HOMEBREW_FORCE_HOMEBREW_ON_LINUX is set!" if Homebrew::EnvConfig.force_homebrew_on_linux?
 
       ohai "Installing `skopeo` for upload..."
       safe_system HOMEBREW_BREW_FILE, "install", "--formula", "skopeo"
@@ -206,7 +206,8 @@ class GitHubPackages
       "org.opencontainers.image.url"           => bottle_hash["formula"]["homepage"],
       "org.opencontainers.image.vendor"        => org,
       "org.opencontainers.image.version"       => version,
-    }.compact
+    }
+    delete_blank_hash_values(formula_annotations_hash)
 
     manifests = bottle_hash["bottle"]["tags"].map do |bottle_tag, tag_hash|
       local_file = tag_hash["local_filename"]
@@ -239,15 +240,17 @@ class GitHubPackages
         os_version ||= "macOS #{MacOS::Version.from_symbol(bottle_tag)}"
       when "linux"
         os_version = (os_version || "Ubuntu 16.04.7").delete_suffix " LTS"
-        glibc_version = (tab["built_on"]["glibc_version"] if tab["built_on"].present?) || "2.23"
-        cpu_variant = tab["oldest_cpu_family"] || "core2"
+        glibc_version = (tab["built_on"]["glibc_version"] if tab["built_on"].present?) || OS::GLIBC_CI_VERSION
+        cpu_variant = tab["oldest_cpu_family"] || Hardware::CPU::INTEL_64BIT_OLDEST_CPU.to_s
       end
 
       platform_hash = {
         architecture: architecture,
         os: os,
         "os.version" => os_version,
-      }.compact
+      }
+      delete_blank_hash_values(platform_hash)
+
       tar_sha256 = Digest::SHA256.hexdigest(
         Utils.safe_popen_read("gunzip", "--stdout", "--decompress", local_file),
       )
@@ -265,7 +268,8 @@ class GitHubPackages
         "sh.brew.bottle.digest"             => tar_gz_sha256,
         "sh.brew.bottle.glibc.version"      => glibc_version,
         "sh.brew.tab"                       => tab.to_json,
-      }.compact
+      }
+      delete_blank_hash_values(descriptor_annotations_hash)
 
       annotations_hash = formula_annotations_hash.merge(descriptor_annotations_hash).merge(
         {
@@ -273,7 +277,8 @@ class GitHubPackages
           "org.opencontainers.image.documentation" => documentation,
           "org.opencontainers.image.title"         => "#{formula_full_name} #{tag}",
         },
-      ).compact.sort.to_h
+      ).sort.to_h
+      delete_blank_hash_values(annotations_hash)
 
       image_manifest = {
         schemaVersion: 2,
@@ -381,4 +386,10 @@ class GitHubPackages
 
     [sha256, json.size]
   end
+
+  def delete_blank_hash_values(hash)
+    hash.each do |key, value|
+      hash.delete(key) if value.blank?
+    end
+  end
 end

Library/Homebrew/hardware.rb

@@ -20,6 +20,8 @@ module Hardware
       *ARM_64BIT_ARCHS,
     ].freeze
 
+    INTEL_64BIT_OLDEST_CPU = :core2
+
     class << self
       extend T::Sig
 
@@ -198,7 +200,7 @@ module Hardware
     def oldest_cpu(_version = nil)
       if Hardware::CPU.intel?
         if Hardware::CPU.is_64_bit?
-          :core2
+          Hardware::CPU::INTEL_64BIT_OLDEST_CPU
         else
           :core
         end

Library/Homebrew/os.rb

@@ -37,6 +37,8 @@ module OS
 
   ::OS_VERSION = ENV["HOMEBREW_OS_VERSION"]
 
+  GLIBC_CI_VERSION = "2.23"
+
   if OS.mac?
     require "os/mac"
     # Don't tell people to report issues on unsupported configurations.

Library/Homebrew/software_spec.rb

@@ -306,6 +306,7 @@ class Bottle
 
     filename = Filename.create(formula, tag, spec.rebuild).bintray
 
+    # TODO: this will need adjusted when if we use GitHub Packages by default
     path, resolved_basename = if spec.root_url.match?(GitHubPackages::URL_REGEX)
       ["#{@name}/blobs/sha256:#{checksum}", filename]
     else
@@ -400,8 +401,10 @@ class Bottle
       version_rebuild = GitHubPackages.version_rebuild(@resource.version, rebuild)
       resource.version(version_rebuild)
 
-      resource.url("#{@spec.root_url}/#{name}/manifests/#{version_rebuild}",
-                   using: CurlGitHubPackagesDownloadStrategy)
+      resource.url("#{@spec.root_url}/#{name}/manifests/#{version_rebuild}", {
+        using:   CurlGitHubPackagesDownloadStrategy,
+        headers: ["Accept: application/vnd.oci.image.index.v1+json"],
+      })
       resource.downloader.resolved_basename = "#{name}-#{version_rebuild}.bottle_manifest.json"
       resource
     end