diff --git a/Library/Homebrew/dev-cmd/pr-pull.rb b/Library/Homebrew/dev-cmd/pr-pull.rb
index f37f993463..80a75e5703 100644
--- a/Library/Homebrew/dev-cmd/pr-pull.rb
+++ b/Library/Homebrew/dev-cmd/pr-pull.rb
@@ -85,12 +85,12 @@ module Homebrew
     [subject, body, trailers]
   end
 
-  def self.signoff!(path, pull_request: nil, dry_run: false)
-    subject, body, trailers = separate_commit_message(path.git_commit_message)
+  def self.signoff!(git_repo, pull_request: nil, dry_run: false)
+    subject, body, trailers = separate_commit_message(git_repo.commit_message)
 
     if pull_request
       # This is a tap pull request and approving reviewers should also sign-off.
-      tap = Tap.from_path(path)
+      tap = Tap.from_path(git_repo.pathname)
       review_trailers = GitHub.approved_reviews(tap.user, tap.full_name.split("/").last, pull_request).map do |r|
         "Signed-off-by: #{r["name"]} <#{r["email"]}>"
       end
@@ -101,7 +101,7 @@ module Homebrew
       body += "\n\n#{close_message}" unless body.include? close_message
     end
 
-    git_args = Utils::Git.git, "-C", path, "commit", "--amend", "--signoff", "--allow-empty", "--quiet",
+    git_args = Utils::Git.git, "-C", git_repo.pathname, "commit", "--amend", "--signoff", "--allow-empty", "--quiet",
                "--message", subject, "--message", body, "--message", trailers
 
     if dry_run
@@ -156,21 +156,21 @@ module Homebrew
 
   # Cherry picks a single commit that modifies a single file.
   # Potentially rewords this commit using {determine_bump_subject}.
-  def self.reword_package_commit(commit, file, reason: "", verbose: false, resolve: false, path: ".")
-    package_file = Pathname.new(path) / file
+  def self.reword_package_commit(commit, file, git_repo:, reason: "", verbose: false, resolve: false)
+    package_file = git_repo.pathname / file
     package_name = package_file.basename.to_s.chomp(".rb")
 
     odebug "Cherry-picking #{package_file}: #{commit}"
-    Utils::Git.cherry_pick!(path, commit, verbose: verbose, resolve: resolve)
+    Utils::Git.cherry_pick!(git_repo, commit, verbose: verbose, resolve: resolve)
 
-    old_package = Utils::Git.file_at_commit(path, file, "HEAD^")
-    new_package = Utils::Git.file_at_commit(path, file, "HEAD")
+    old_package = Utils::Git.file_at_commit(git_repo, file, "HEAD^")
+    new_package = Utils::Git.file_at_commit(git_repo, file, "HEAD")
 
     bump_subject = determine_bump_subject(old_package, new_package, package_file, reason: reason).strip
-    subject, body, trailers = separate_commit_message(path.git_commit_message)
+    subject, body, trailers = separate_commit_message(git_repo.commit_message)
 
     if subject != bump_subject && !subject.start_with?("#{package_name}:")
-      safe_system("git", "-C", path, "commit", "--amend", "-q",
+      safe_system("git", "-C", git_repo.pathname, "commit", "--amend", "-q",
                   "-m", bump_subject, "-m", subject, "-m", body, "-m", trailers)
       ohai bump_subject
     else
@@ -181,7 +181,7 @@ module Homebrew
   # Cherry picks multiple commits that each modify a single file.
   # Words the commit according to {determine_bump_subject} with the body
   # corresponding to all the original commit messages combined.
-  def self.squash_package_commits(commits, file, reason: "", verbose: false, resolve: false, path: ".")
+  def self.squash_package_commits(commits, file, git_repo:, reason: "", verbose: false, resolve: false)
     odebug "Squashing #{file}: #{commits.join " "}"
 
     # Format commit messages into something similar to `git fmt-merge-message`.
@@ -192,35 +192,36 @@ module Homebrew
     messages = []
     trailers = []
     commits.each do |commit|
-      subject, body, trailer = separate_commit_message(path.git_commit_message(commit))
+      subject, body, trailer = separate_commit_message(git_repo.commit_message(commit))
       body = body.lines.map { |line| "  #{line.strip}" }.join("\n")
       messages << "* #{subject}\n#{body}".strip
       trailers << trailer
     end
 
     # Get the set of authors in this series.
-    authors = Utils.safe_popen_read("git", "-C", path, "show",
+    authors = Utils.safe_popen_read("git", "-C", git_repo.pathname, "show",
                                     "--no-patch", "--pretty=%an <%ae>", *commits).lines.map(&:strip).uniq.compact
 
     # Get the author and date of the first commit of this series, which we use for the squashed commit.
     original_author = authors.shift
-    original_date = Utils.safe_popen_read "git", "-C", path, "show", "--no-patch", "--pretty=%ad", commits.first
+    original_date = Utils.safe_popen_read "git", "-C", git_repo.pathname, "show", "--no-patch", "--pretty=%ad",
+                                          commits.first
 
     # Generate trailers for coauthors and combine them with the existing trailers.
     co_author_trailers = authors.map { |au| "Co-authored-by: #{au}" }
     trailers = [trailers + co_author_trailers].flatten.uniq.compact
 
     # Apply the patch series but don't commit anything yet.
-    Utils::Git.cherry_pick!(path, "--no-commit", *commits, verbose: verbose, resolve: resolve)
+    Utils::Git.cherry_pick!(git_repo.pathname, "--no-commit", *commits, verbose: verbose, resolve: resolve)
 
     # Determine the bump subject by comparing the original state of the tree to its current state.
-    package_file = Pathname.new(path) / file
-    old_package = Utils::Git.file_at_commit(path, file, "#{commits.first}^")
+    package_file = git_repo.pathname / file
+    old_package = Utils::Git.file_at_commit(git_repo.pathname, file, "#{commits.first}^")
     new_package = package_file.read
     bump_subject = determine_bump_subject(old_package, new_package, package_file, reason: reason)
 
     # Commit with the new subject, body, and trailers.
-    safe_system("git", "-C", path, "commit", "--quiet",
+    safe_system("git", "-C", git_repo.pathname, "commit", "--quiet",
                 "-m", bump_subject, "-m", messages.join("\n"), "-m", trailers.join("\n"),
                 "--author", original_author, "--date", original_date, "--", file)
     ohai bump_subject
@@ -228,7 +229,8 @@ module Homebrew
 
   # TODO: fix test in `test/dev-cmd/pr-pull_spec.rb` and assume `cherry_picked: false`.
   def self.autosquash!(original_commit, tap:, reason: "", verbose: false, resolve: false, cherry_picked: true)
-    original_head = tap.path.git_head
+    git_repo = tap.git_repo
+    original_head = git_repo.head_ref
 
     commits = Utils.safe_popen_read("git", "-C", tap.path, "rev-list",
                                     "--reverse", "#{original_commit}..HEAD").lines.map(&:strip)
@@ -268,13 +270,15 @@ module Homebrew
       files = commits_to_files[commit]
       if files.length == 1 && files_to_commits[files.first].length == 1
         # If there's a 1:1 mapping of commits to files, just cherry pick and (maybe) reword.
-        reword_package_commit(commit, files.first, path: tap.path, reason: reason, verbose: verbose, resolve: resolve)
+        reword_package_commit(
+          commit, files.first, git_repo: git_repo, reason: reason, verbose: verbose, resolve: resolve
+        )
         processed_commits << commit
       elsif files.length == 1 && files_to_commits[files.first].length > 1
         # If multiple commits modify a single file, squash them down into a single commit.
         file = files.first
         commits = files_to_commits[file]
-        squash_package_commits(commits, file, path: tap.path, reason: reason, verbose: verbose, resolve: resolve)
+        squash_package_commits(commits, file, git_repo: git_repo, reason: reason, verbose: verbose, resolve: resolve)
         processed_commits += commits
       else
         # We can't split commits (yet) so just raise an error.
@@ -450,8 +454,9 @@ module Homebrew
       _, user, repo, pr = *url_match
       odie "Not a GitHub pull request: #{arg}" unless pr
 
-      if !tap.path.git_default_origin_branch? || args.branch_okay? || args.clean?
-        opoo "Current branch is #{tap.path.git_branch}: do you need to pull inside #{tap.path.git_origin_branch}?"
+      git_repo = tap.git_repo
+      if !git_repo.default_origin_branch? || args.branch_okay? || args.clean?
+        opoo "Current branch is #{git_repo.branch_name}: do you need to pull inside #{git_repo.origin_branch_name}?"
       end
 
       pr_labels = GitHub.pull_request_labels(user, repo, pr)
@@ -479,7 +484,7 @@ module Homebrew
               autosquash!(original_commit, tap: tap, cherry_picked: !args.no_cherry_pick?,
                           verbose: args.verbose?, resolve: args.resolve?, reason: args.message)
             end
-            signoff!(tap.path, pull_request: pr, dry_run: args.dry_run?) unless args.clean?
+            signoff!(git_repo, pull_request: pr, dry_run: args.dry_run?) unless args.clean?
           end
 
           unless formulae_need_bottles?(tap, original_commit, pr_labels, args: args)
diff --git a/Library/Homebrew/diagnostic.rb b/Library/Homebrew/diagnostic.rb
index 9b88e6ef7b..070ba8dd61 100644
--- a/Library/Homebrew/diagnostic.rb
+++ b/Library/Homebrew/diagnostic.rb
@@ -126,10 +126,11 @@ module Homebrew
         EOS
       end
 
+      sig { params(repository_path: GitRepository, desired_origin: String).returns(T.nilable(String)) }
       def examine_git_origin(repository_path, desired_origin)
-        return if !Utils::Git.available? || !repository_path.git?
+        return if !Utils::Git.available? || !repository_path.git_repo?
 
-        current_origin = repository_path.git_origin
+        current_origin = repository_path.origin_url
 
         if current_origin.nil?
           <<~EOS
@@ -155,8 +156,8 @@ module Homebrew
       def broken_tap(tap)
         return unless Utils::Git.available?
 
-        repo = HOMEBREW_REPOSITORY.dup.extend(GitRepositoryExtension)
-        return unless repo.git?
+        repo = GitRepository.new(HOMEBREW_REPOSITORY)
+        return unless repo.git_repo?
 
         message = <<~EOS
           #{tap.full_name} was not tapped properly! Run:
@@ -168,7 +169,7 @@ module Homebrew
 
         tap_head = tap.git_head
         return message if tap_head.blank?
-        return if tap_head != repo.git_head
+        return if tap_head != repo.head_ref
 
         message
       end
@@ -516,7 +517,7 @@ module Homebrew
       end
 
       def check_brew_git_origin
-        repo = HOMEBREW_REPOSITORY.dup.extend(GitRepositoryExtension)
+        repo = GitRepository.new(HOMEBREW_REPOSITORY)
         examine_git_origin(repo, Homebrew::EnvConfig.brew_git_remote)
       end
 
@@ -528,14 +529,14 @@ module Homebrew
           CoreTap.ensure_installed!
         end
 
-        broken_tap(coretap) || examine_git_origin(coretap.path, Homebrew::EnvConfig.core_git_remote)
+        broken_tap(coretap) || examine_git_origin(coretap.git_repo, Homebrew::EnvConfig.core_git_remote)
       end
 
       def check_casktap_integrity
         default_cask_tap = Tap.default_cask_tap
         return unless default_cask_tap.installed?
 
-        broken_tap(default_cask_tap) || examine_git_origin(default_cask_tap.path, default_cask_tap.remote)
+        broken_tap(default_cask_tap) || examine_git_origin(default_cask_tap.git_repo, default_cask_tap.remote)
       end
 
       sig { returns(T.nilable(String)) }
diff --git a/Library/Homebrew/extend/git_repository.rbi b/Library/Homebrew/extend/git_repository.rbi
deleted file mode 100644
index 9ffee241cf..0000000000
--- a/Library/Homebrew/extend/git_repository.rbi
+++ /dev/null
@@ -1,5 +0,0 @@
-# typed: strict
-
-module GitRepositoryExtension
-  requires_ancestor { Pathname }
-end
diff --git a/Library/Homebrew/extend/git_repository.rb b/Library/Homebrew/git_repository.rb
similarity index 74%
rename from Library/Homebrew/extend/git_repository.rb
rename to Library/Homebrew/git_repository.rb
index 6e21970e31..ba5aab4024 100644
--- a/Library/Homebrew/extend/git_repository.rb
+++ b/Library/Homebrew/git_repository.rb
@@ -4,100 +4,108 @@
 require "utils/git"
 require "utils/popen"
 
-# Extensions to {Pathname} for querying Git repository information.
+# Given a {Pathname}, provides methods for querying Git repository information.
 # @see Utils::Git
 # @api private
-module GitRepositoryExtension
+class GitRepository
   extend T::Sig
 
+  sig { returns(Pathname) }
+  attr_reader :pathname
+
+  sig { params(pathname: Pathname).void }
+  def initialize(pathname)
+    @pathname = pathname
+  end
+
   sig { returns(T::Boolean) }
-  def git?
-    join(".git").exist?
+  def git_repo?
+    pathname.join(".git").exist?
   end
 
   # Gets the URL of the Git origin remote.
   sig { returns(T.nilable(String)) }
-  def git_origin
+  def origin_url
     popen_git("config", "--get", "remote.origin.url")
   end
 
   # Sets the URL of the Git origin remote.
   sig { params(origin: String).returns(T.nilable(T::Boolean)) }
-  def git_origin=(origin)
-    return if !git? || !Utils::Git.available?
+  def origin_url=(origin)
+    return if !git_repo? || !Utils::Git.available?
 
-    safe_system Utils::Git.git, "remote", "set-url", "origin", origin, chdir: self
+    safe_system Utils::Git.git, "remote", "set-url", "origin", origin, chdir: pathname
   end
 
   # Gets the full commit hash of the HEAD commit.
   sig { params(safe: T::Boolean).returns(T.nilable(String)) }
-  def git_head(safe: false)
+  def head_ref(safe: false)
     popen_git("rev-parse", "--verify", "--quiet", "HEAD", safe: safe)
   end
 
   # Gets a short commit hash of the HEAD commit.
   sig { params(length: T.nilable(Integer), safe: T::Boolean).returns(T.nilable(String)) }
-  def git_short_head(length: nil, safe: false)
+  def short_head_ref(length: nil, safe: false)
     short_arg = length.present? ? "--short=#{length}" : "--short"
     popen_git("rev-parse", short_arg, "--verify", "--quiet", "HEAD", safe: safe)
   end
 
   # Gets the relative date of the last commit, e.g. "1 hour ago"
   sig { returns(T.nilable(String)) }
-  def git_last_commit
+  def last_committed
     popen_git("show", "-s", "--format=%cr", "HEAD")
   end
 
   # Gets the name of the currently checked-out branch, or HEAD if the repository is in a detached HEAD state.
   sig { params(safe: T::Boolean).returns(T.nilable(String)) }
-  def git_branch(safe: false)
+  def branch_name(safe: false)
     popen_git("rev-parse", "--abbrev-ref", "HEAD", safe: safe)
   end
 
   # Change the name of a local branch
   sig { params(old: String, new: String).void }
-  def git_rename_branch(old:, new:)
+  def rename_branch(old:, new:)
     popen_git("branch", "-m", old, new)
   end
 
   # Set an upstream branch for a local branch to track
   sig { params(local: String, origin: String).void }
-  def git_branch_set_upstream(local:, origin:)
+  def set_upstream_branch(local:, origin:)
     popen_git("branch", "-u", "origin/#{origin}", local)
   end
 
   # Gets the name of the default origin HEAD branch.
   sig { returns(T.nilable(String)) }
-  def git_origin_branch
+  def origin_branch_name
     popen_git("symbolic-ref", "-q", "--short", "refs/remotes/origin/HEAD")&.split("/")&.last
   end
 
   # Returns true if the repository's current branch matches the default origin branch.
   sig { returns(T.nilable(T::Boolean)) }
-  def git_default_origin_branch?
-    git_origin_branch == git_branch
+  def default_origin_branch?
+    origin_branch_name == branch_name
   end
 
   # Returns the date of the last commit, in YYYY-MM-DD format.
   sig { returns(T.nilable(String)) }
-  def git_last_commit_date
+  def last_commit_date
     popen_git("show", "-s", "--format=%cd", "--date=short", "HEAD")
   end
 
   # Returns true if the given branch exists on origin
   sig { params(branch: String).returns(T::Boolean) }
-  def git_origin_has_branch?(branch)
+  def origin_has_branch?(branch)
     popen_git("ls-remote", "--heads", "origin", branch).present?
   end
 
   sig { void }
-  def git_origin_set_head_auto
+  def set_head_origin_auto
     popen_git("remote", "set-head", "origin", "--auto")
   end
 
   # Gets the full commit message of the specified commit, or of the HEAD commit if unspecified.
   sig { params(commit: String, safe: T::Boolean).returns(T.nilable(String)) }
-  def git_commit_message(commit = "HEAD", safe: false)
+  def commit_message(commit = "HEAD", safe: false)
     popen_git("log", "-1", "--pretty=%B", commit, "--", safe: safe, err: :out)&.strip
   end
 
@@ -105,10 +113,10 @@ module GitRepositoryExtension
 
   sig { params(args: T.untyped, safe: T::Boolean, err: T.nilable(Symbol)).returns(T.nilable(String)) }
   def popen_git(*args, safe: false, err: nil)
-    unless git?
+    unless git_repo?
       return unless safe
 
-      raise "Not a Git repository: #{self}"
+      raise "Not a Git repository: #{pathname}"
     end
 
     unless Utils::Git.available?
@@ -117,6 +125,6 @@ module GitRepositoryExtension
       raise "Git is unavailable"
     end
 
-    Utils.popen_read(Utils::Git.git, *args, safe: safe, chdir: self, err: err).chomp.presence
+    Utils.popen_read(Utils::Git.git, *args, safe: safe, chdir: pathname, err: err).chomp.presence
   end
 end
diff --git a/Library/Homebrew/global.rb b/Library/Homebrew/global.rb
index 3c3cecdb2d..071eba618a 100644
--- a/Library/Homebrew/global.rb
+++ b/Library/Homebrew/global.rb
@@ -131,7 +131,7 @@ end
 
 require "context"
 require "extend/array"
-require "extend/git_repository"
+require "git_repository"
 require "extend/pathname"
 require "extend/predicable"
 require "extend/module"
diff --git a/Library/Homebrew/system_config.rb b/Library/Homebrew/system_config.rb
index 349b1e1288..a5a1e48198 100644
--- a/Library/Homebrew/system_config.rb
+++ b/Library/Homebrew/system_config.rb
@@ -1,4 +1,4 @@
-# typed: false
+# typed: true
 # frozen_string_literal: true
 
 require "hardware"
@@ -32,24 +32,24 @@ module SystemConfig
       end
     end
 
-    sig { returns(Pathname) }
+    sig { returns(GitRepository) }
     def homebrew_repo
-      HOMEBREW_REPOSITORY.dup.extend(GitRepositoryExtension)
+      GitRepository.new(HOMEBREW_REPOSITORY)
     end
 
     sig { returns(String) }
     def head
-      homebrew_repo.git_head || "(none)"
+      homebrew_repo.head_ref || "(none)"
     end
 
     sig { returns(String) }
     def last_commit
-      homebrew_repo.git_last_commit || "never"
+      homebrew_repo.last_committed || "never"
     end
 
     sig { returns(String) }
     def origin
-      homebrew_repo.git_origin || "(none)"
+      homebrew_repo.origin_url || "(none)"
     end
 
     sig { returns(String) }
@@ -69,7 +69,7 @@ module SystemConfig
 
     sig { returns(String) }
     def core_tap_origin
-      CoreTap.instance.remote || "(none)"
+      CoreTap.instance.remote
     end
 
     sig { returns(String) }
@@ -132,8 +132,9 @@ module SystemConfig
     def describe_curl
       out, = system_command(curl_executable, args: ["--version"], verbose: false)
 
-      if /^curl (?<curl_version>[\d.]+)/ =~ out
-        "#{curl_version} => #{curl_path}"
+      match_data = /^curl (?<curl_version>[\d.]+)/.match(out)
+      if match_data
+        "#{match_data[:curl_version]} => #{curl_path}"
       else
         "N/A"
       end
diff --git a/Library/Homebrew/tap.rb b/Library/Homebrew/tap.rb
index f263af6053..cb4f3b080a 100644
--- a/Library/Homebrew/tap.rb
+++ b/Library/Homebrew/tap.rb
@@ -93,8 +93,13 @@ class Tap
 
   # The local path to this {Tap}.
   # e.g. `/usr/local/Library/Taps/user/homebrew-repo`
+  sig { returns(Pathname) }
   attr_reader :path
 
+  # The git repository of this {Tap}.
+  sig { returns(GitRepository) }
+  attr_reader :git_repo
+
   # @private
   def initialize(user, repo)
     @user = user
@@ -102,7 +107,7 @@ class Tap
     @name = "#{@user}/#{@repo}".downcase
     @full_name = "#{@user}/homebrew-#{@repo}"
     @path = TAP_DIRECTORY/@full_name.downcase
-    @path.extend(GitRepositoryExtension)
+    @git_repo = GitRepository.new(@path)
     @alias_table = nil
     @alias_reverse_table = nil
   end
@@ -136,7 +141,7 @@ class Tap
   def remote
     return default_remote unless installed?
 
-    @remote ||= path.git_origin
+    @remote ||= git_repo.origin_url
   end
 
   # The remote repository name of this {Tap}.
@@ -164,28 +169,28 @@ class Tap
 
   # True if this {Tap} is a Git repository.
   def git?
-    path.git?
+    git_repo.git_repo?
   end
 
   # git branch for this {Tap}.
   def git_branch
     raise TapUnavailableError, name unless installed?
 
-    path.git_branch
+    git_repo.branch_name
   end
 
   # git HEAD for this {Tap}.
   def git_head
     raise TapUnavailableError, name unless installed?
 
-    @git_head ||= path.git_head
+    @git_head ||= git_repo.head_ref
   end
 
   # Time since last git commit for this {Tap}.
   def git_last_commit
     raise TapUnavailableError, name unless installed?
 
-    path.git_last_commit
+    git_repo.last_committed
   end
 
   # The issues URL of this {Tap}.
@@ -386,20 +391,20 @@ class Tap
       $stderr.ohai "#{name}: changed remote from #{remote} to #{requested_remote}" unless quiet
     end
 
-    current_upstream_head = path.git_origin_branch
-    return if requested_remote.blank? && path.git_origin_has_branch?(current_upstream_head)
+    current_upstream_head = T.must(git_repo.origin_branch_name)
+    return if requested_remote.blank? && git_repo.origin_has_branch?(current_upstream_head)
 
     args = %w[fetch]
     args << "--quiet" if quiet
     args << "origin"
     safe_system "git", "-C", path, *args
-    path.git_origin_set_head_auto
+    git_repo.set_head_origin_auto
 
-    new_upstream_head = path.git_origin_branch
+    new_upstream_head = T.must(git_repo.origin_branch_name)
     return if new_upstream_head == current_upstream_head
 
-    path.git_rename_branch old: current_upstream_head, new: new_upstream_head
-    path.git_branch_set_upstream local: new_upstream_head, origin: new_upstream_head
+    git_repo.rename_branch old: current_upstream_head, new: new_upstream_head
+    git_repo.set_upstream_branch local: new_upstream_head, origin: new_upstream_head
 
     return if quiet
 
diff --git a/Library/Homebrew/test/dev-cmd/pr-pull_spec.rb b/Library/Homebrew/test/dev-cmd/pr-pull_spec.rb
index 9366befe34..4465fc4a30 100644
--- a/Library/Homebrew/test/dev-cmd/pr-pull_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/pr-pull_spec.rb
@@ -81,7 +81,7 @@ describe "brew pr-pull" do
     let(:tap) { Tap.fetch("Homebrew", "foo") }
     let(:formula_file) { tap.path/"Formula/foo.rb" }
     let(:cask_file) { tap.cask_dir/"food.rb" }
-    let(:path) { (Tap::TAP_DIRECTORY/"homebrew/homebrew-foo").extend(GitRepositoryExtension) }
+    let(:path) { Pathname(Tap::TAP_DIRECTORY/"homebrew/homebrew-foo") }
 
     describe "#autosquash!" do
       it "squashes a formula or cask correctly" do
@@ -98,8 +98,8 @@ describe "brew pr-pull" do
           File.write(formula_file, formula_version)
           safe_system Utils::Git.git, "commit", formula_file, "-m", "version", "--author=#{secondary_author}"
           described_class.autosquash!(original_hash, tap: tap)
-          expect(tap.path.git_commit_message).to include("foo 2.0")
-          expect(tap.path.git_commit_message).to include("Co-authored-by: #{secondary_author}")
+          expect(tap.git_repo.commit_message).to include("foo 2.0")
+          expect(tap.git_repo.commit_message).to include("Co-authored-by: #{secondary_author}")
         end
 
         (path/"Casks").mkpath
@@ -113,8 +113,9 @@ describe "brew pr-pull" do
           File.write(cask_file, cask_version)
           safe_system Utils::Git.git, "commit", cask_file, "-m", "version", "--author=#{secondary_author}"
           described_class.autosquash!(original_hash, tap: tap)
-          expect(path.git_commit_message).to include("food 2.0")
-          expect(path.git_commit_message).to include("Co-authored-by: #{secondary_author}")
+          git_repo = GitRepository.new(path)
+          expect(git_repo.commit_message).to include("food 2.0")
+          expect(git_repo.commit_message).to include("Co-authored-by: #{secondary_author}")
         end
       end
     end
@@ -128,8 +129,8 @@ describe "brew pr-pull" do
           safe_system Utils::Git.git, "add", formula_file
           safe_system Utils::Git.git, "commit", "-m", "foo 1.0 (new formula)"
         end
-        described_class.signoff!(tap.path)
-        expect(tap.path.git_commit_message).to include("Signed-off-by:")
+        described_class.signoff!(tap.git_repo)
+        expect(tap.git_repo.commit_message).to include("Signed-off-by:")
 
         (path/"Casks").mkpath
         cask_file.write(cask)
@@ -137,8 +138,8 @@ describe "brew pr-pull" do
           safe_system Utils::Git.git, "add", cask_file
           safe_system Utils::Git.git, "commit", "-m", "food 1.0 (new cask)"
         end
-        described_class.signoff!(tap.path)
-        expect(tap.path.git_commit_message).to include("Signed-off-by:")
+        described_class.signoff!(tap.git_repo)
+        expect(tap.git_repo.commit_message).to include("Signed-off-by:")
       end
     end
 
diff --git a/Library/Homebrew/utils/git.rb b/Library/Homebrew/utils/git.rb
index 54007e24b8..10c36f2896 100644
--- a/Library/Homebrew/utils/git.rb
+++ b/Library/Homebrew/utils/git.rb
@@ -4,7 +4,7 @@
 module Utils
   # Helper functions for querying Git information.
   #
-  # @see GitRepositoryExtension
+  # @see GitRepository
   # @api private
   module Git
     extend T::Sig
diff --git a/Library/Homebrew/utils/git_repository.rb b/Library/Homebrew/utils/git_repository.rb
index 6c0e983a89..2af21e2989 100644
--- a/Library/Homebrew/utils/git_repository.rb
+++ b/Library/Homebrew/utils/git_repository.rb
@@ -13,10 +13,9 @@ module Utils
     ).returns(T.nilable(String))
   }
   def self.git_head(repo = Pathname.pwd, length: nil, safe: true)
-    return git_short_head(repo, length: length) if length.present?
+    return git_short_head(repo, length: length) if length
 
-    repo = Pathname(repo).extend(GitRepositoryExtension)
-    repo.git_head(safe: safe)
+    GitRepository.new(Pathname(repo)).head_ref(safe: safe)
   end
 
   # Gets a short commit hash of the HEAD commit.
@@ -28,8 +27,7 @@ module Utils
     ).returns(T.nilable(String))
   }
   def self.git_short_head(repo = Pathname.pwd, length: nil, safe: true)
-    repo = Pathname(repo).extend(GitRepositoryExtension)
-    repo.git_short_head(length: length, safe: safe)
+    GitRepository.new(Pathname(repo)).short_head_ref(length: length, safe: safe)
   end
 
   # Gets the name of the currently checked-out branch, or HEAD if the repository is in a detached HEAD state.
@@ -40,8 +38,7 @@ module Utils
     ).returns(T.nilable(String))
   }
   def self.git_branch(repo = Pathname.pwd, safe: true)
-    repo = Pathname(repo).extend(GitRepositoryExtension)
-    repo.git_branch(safe: safe)
+    GitRepository.new(Pathname(repo)).branch_name(safe: safe)
   end
 
   # Gets the full commit message of the specified commit, or of the HEAD commit if unspecified.
@@ -53,7 +50,6 @@ module Utils
     ).returns(T.nilable(String))
   }
   def self.git_commit_message(repo = Pathname.pwd, commit: "HEAD", safe: true)
-    repo = Pathname(repo).extend(GitRepositoryExtension)
-    repo.git_commit_message(commit, safe: safe)
+    GitRepository.new(Pathname(repo)).commit_message(commit, safe: safe)
   end
 end