Make HOMEBREW_NO_BOTTLE_SOURCE_FALLBACK default

- Remove `HOMEBREW_NO_BOTTLE_SOURCE_FALLBACK` and make the behaviour
  the default. We mostly already do this since we added the need for
  the `--build-from-source` override on macOS. This allows us to
  delete some more code.
- Still fail and require `--build-from-source` when reinstalling or
  upgrading if failing on a formula-specific reason e.g. the CLT is
  not/no longer installed, you're using a non-default prefix.

Fixes #10623

Library/Homebrew/env_config.rb

@@ -212,11 +212,6 @@ module Homebrew
         description: "If set, do not use Bootsnap to speed up repeated `brew` calls.",
         boolean:     true,
       },
-      HOMEBREW_NO_BOTTLE_SOURCE_FALLBACK:     {
-        description: "If set, fail on the failure of installation from a bottle rather than " \
-                     "falling back to building from source.",
-        boolean:     true,
-      },
       HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK: {
         description: "If set, do not check for broken dependents after installing, upgrading or reinstalling " \
                      "formulae.",

Library/Homebrew/formula_installer.rb

@@ -94,7 +94,6 @@ class FormulaInstaller
     @options = options
     @requirement_messages = []
     @poured_bottle = false
-    @pour_failed = false
     @start_time = nil
   end
 
@@ -154,8 +153,6 @@ class FormulaInstaller
 
   sig { params(output_warning: T::Boolean).returns(T::Boolean) }
   def pour_bottle?(output_warning: false)
-    return false if @pour_failed
-
     return false if !formula.bottle_tag? && !formula.local_bottle_path
     return true  if force_bottle?
     return false if build_from_source? || build_bottle? || interactive?
@@ -235,8 +232,7 @@ class FormulaInstaller
        # homebrew-core and have full bottle coverage.
        (OS.mac? || ENV["CI"]) &&
        !build_from_source? && !build_bottle? &&
-       !installed_as_dependency? &&
+       formula.tap&.core_tap? && !formula.bottle_unneeded? &&
-       formula.tap&.core_tap? && !formula.bottle_unneeded? && !formula.any_version_installed? &&
        # Integration tests override homebrew-core locations
        ENV["HOMEBREW_TEST_TMPDIR"].nil? &&
        !pour_bottle?
@@ -244,12 +240,19 @@ class FormulaInstaller
         formula_message = formula.pour_bottle_check_unsatisfied_reason
         formula_message[0] = formula_message[0].downcase
 
-        "#{formula}: #{formula_message}"
+        <<~EOS
-      else
+          #{formula}: #{formula_message}
+        EOS
+      # don't want to complain about no bottle available if doing an
+      # upgrade/reinstall/dependency install (but do in the case the bottle
+      # check fails)
+      elsif !installed_as_dependency? && !formula.any_version_installed?
         <<~EOS
           #{formula}: no bottle available!
         EOS
       end
+
+      if message
         message += <<~EOS
           You can try to install from source with:
             brew install --build-from-source #{formula}
@@ -260,6 +263,7 @@ class FormulaInstaller
         EOS
         raise CannotInstallFormulaError, message
       end
+    end
 
     type, reason = DeprecateDisable.deprecate_disable_info formula
 
@@ -429,7 +433,7 @@ class FormulaInstaller
     if pour_bottle?
       begin
         pour
-      rescue Exception => e # rubocop:disable Lint/RescueException
+      rescue Exception # rubocop:disable Lint/RescueException
         # any exceptions must leave us with nothing installed
         ignore_interrupts do
           begin
@@ -442,17 +446,7 @@ class FormulaInstaller
           end
           formula.rack.rmdir_if_possible
         end
-        raise if Homebrew::EnvConfig.developer? ||
+        raise
-                 Homebrew::EnvConfig.no_bottle_source_fallback? ||
-                 force_bottle? ||
-                 e.is_a?(Interrupt)
-
-        @pour_failed = true
-        onoe e.message
-        opoo "Bottle installation failed: building from source."
-        raise UnbottledError, [formula] unless DevelopmentTools.installed?
-
-        compute_and_install_dependencies unless ignore_deps?
       else
         @poured_bottle = true
       end
@@ -513,7 +507,7 @@ class FormulaInstaller
 
       $stderr.puts "Please report this issue to the #{formula.tap} tap (not Homebrew/brew or Homebrew/core)!"
       false
-    else # rubocop:disable Layout/ElseAlignment
+    else
       f.linked_keg.exist? && f.opt_prefix.exist?
     end
 
@@ -1123,25 +1117,10 @@ class FormulaInstaller
 
     return if only_deps?
 
-    if pour_bottle?(output_warning: true)
+    unless pour_bottle?(output_warning: true)
-      begin
-        downloader.fetch
-      rescue Exception => e # rubocop:disable Lint/RescueException
-        raise if Homebrew::EnvConfig.developer? ||
-                 Homebrew::EnvConfig.no_bottle_source_fallback? ||
-                 force_bottle? ||
-                 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
 

docs/Manpage.md

@@ -1852,9 +1852,6 @@ example, run `export HOMEBREW_NO_INSECURE_REDIRECT=1` rather than just
 - `HOMEBREW_NO_BOOTSNAP`
   <br>If set, do not use Bootsnap to speed up repeated `brew` calls.
 
-- `HOMEBREW_NO_BOTTLE_SOURCE_FALLBACK`
-  <br>If set, fail on the failure of installation from a bottle rather than falling back to building from source.
-
 - `HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK`
   <br>If set, do not check for broken dependents after installing, upgrading or reinstalling formulae.
 

manpages/brew.1

@@ -2641,12 +2641,6 @@ If set, do not automatically update before running some commands e\.g\. \fBbrew
 If set, do not use Bootsnap to speed up repeated \fBbrew\fR calls\.
 .
 .TP
-\fBHOMEBREW_NO_BOTTLE_SOURCE_FALLBACK\fR
-.
-.br
-If set, fail on the failure of installation from a bottle rather than falling back to building from source\.
-.
-.TP
 \fBHOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK\fR
 .
 .br