Merge pull request #4161 from alyssais/pull-gpg

Fix brew pull with git commit.gpgsign enabled

Library/Homebrew/dev-cmd/pull.rb

@@ -102,6 +102,20 @@ module Homebrew
       ENV["GIT_COMMITTER_EMAIL"] = ENV["HOMEBREW_GIT_EMAIL"]
     end
 
+    # Depending on user configuration, git may try to invoke gpg.
+    if Utils.popen_read("git config --get --bool commit.gpgsign").chomp == "true"
+      begin
+        gnupg = Formula["gnupg"]
+      rescue FormulaUnavailableError # rubocop:disable Lint/HandleExceptions
+      else
+        if gnupg.installed?
+          path = PATH.new(ENV.fetch("PATH"))
+          path.prepend(gnupg.installed_prefix/"bin")
+          ENV["PATH"] = path
+        end
+      end
+    end
+
     do_bump = @args.bump? && !@args.clean?
 
     # Formulae with affected bottles that were published