Bottle extract and fetch fixes

- Make `brew extract` strip out bottle blocks
- Make `brew extract` output the path in a readable fashion
- Warn about building from source before fetching (not installing)
- If fetching a bottle fails, refetch and build from source.

Library/Homebrew/dev-cmd/extract.rb

@@ -191,7 +191,10 @@ module Homebrew
     # Remove any existing version suffixes, as a new one will be added later
     name.sub!(/\b@(.*)\z\b/i, "")
     versioned_name = Formulary.class_s("#{name}@#{version}")
-    result.gsub!("class #{class_name} < Formula", "class #{versioned_name} < Formula")
+    result.sub!("class #{class_name} < Formula", "class #{versioned_name} < Formula")
+
+    # Remove bottle blocks, they won't work.
+    result.sub!(/  bottle do.+?end\n\n/m, "") if destination_tap != source_tap
 
     path = destination_tap.path/"Formula/#{name}@#{version}.rb"
     if path.exist?
@@ -205,7 +208,8 @@ module Homebrew
       odebug "Overwriting existing formula at #{path}"
       path.delete
     end
-    ohai "Writing formula for #{name} from revision #{rev} to #{path}"
+    ohai "Writing formula for #{name} from revision #{rev} to:"
+    puts path
     path.write result
   end
 

Library/Homebrew/formula_installer.rb

@@ -292,7 +292,7 @@ class FormulaInstaller
 
     self.class.attempted << formula
 
-    if pour_bottle?(warn: true)
+    if pour_bottle?
       begin
         pour
       rescue Exception => e # rubocop:disable Lint/RescueException
@@ -983,11 +983,24 @@ class FormulaInstaller
 
     return if only_deps?
 
-    unless pour_bottle?
+    if pour_bottle?(warn: true)
+      begin
+        downloader.fetch
+      rescue Exception => e # rubocop:disable Lint/RescueException
+        raise if Homebrew::EnvConfig.developer? ||
+                 Homebrew::EnvConfig.no_bottle_source_fallback? ||
+                 e.is_a?(Interrupt)
+
+        @pour_failed = true
+        onoe e.message
+        opoo "Bottle installation failed: building from source."
+        fetch_dependencies
+      end
+    end
+    return if pour_bottle?
+
     formula.fetch_patches
     formula.resources.each(&:fetch)
-    end
-
     downloader.fetch
   end