Refactor output_unsupported_error.

Library/Homebrew/brew.rb

@@ -35,13 +35,6 @@ rescue MissingEnvironmentVariables => e
   exec ENV["HOMEBREW_BREW_FILE"], *ARGV
 end
 
-def output_unsupported_error
-  $stderr.puts <<~EOS
-    Please create pull requests instead of asking for help on Homebrew's GitHub,
-    Discourse, Twitter or IRC.
-  EOS
-end
-
 begin
   trap("INT", std_trap) # restore default CTRL-C handler
 
@@ -150,7 +143,12 @@ rescue BuildError => e
   Utils::Analytics.report_build_error(e)
   e.dump
 
-  output_unsupported_error if e.formula.head? || e.formula.deprecated? || e.formula.disabled?
+  if e.formula.head? || e.formula.deprecated? || e.formula.disabled?
+    $stderr.puts <<~EOS
+      Please create pull requests instead of asking for help on Homebrew's GitHub,
+      Discourse, Twitter or IRC.
+    EOS
+  end
 
   exit 1
 rescue RuntimeError, SystemCallError => e
@@ -159,8 +157,6 @@ rescue RuntimeError, SystemCallError => e
   onoe e
   $stderr.puts e.backtrace if Homebrew.args.debug?
 
-  output_unsupported_error if Homebrew.args.HEAD?
-
   exit 1
 rescue MethodDeprecatedError => e
   onoe e

Library/Homebrew/patch.rb

@@ -159,6 +159,11 @@ class ExternalPatch
         end
       end
     end
+  rescue ErrorDuringExecution => e
+    raise unless (f = resource.owner&.owner)
+
+    cmd, *args = e.cmd
+    raise BuildError.new(f, cmd, args, ENV.to_hash)
   end
 
   def inspect

Library/Homebrew/test/patching_spec.rb

@@ -149,7 +149,7 @@ describe "patching" do
       end
 
       f.brew { |formula, _staging| formula.patch }
-    }.to raise_error(ErrorDuringExecution)
+    }.to raise_error(BuildError)
   end
 
   specify "single_patch_dsl_with_incorrect_strip_with_apply" do
@@ -163,7 +163,7 @@ describe "patching" do
       end
 
       f.brew { |formula, _staging| formula.patch }
-    }.to raise_error(ErrorDuringExecution)
+    }.to raise_error(BuildError)
   end
 
   specify "patch_p0_dsl" do
@@ -219,7 +219,7 @@ describe "patching" do
       end
 
       f.brew { |formula, _staging| formula.patch }
-    }.to raise_error(ErrorDuringExecution)
+    }.to raise_error(BuildError)
   end
 end