From 56e6710064bcbe8edc1caa97ed0bfb6ac8450e99 Mon Sep 17 00:00:00 2001
From: Connor Mann <connor@cnnrmnn.com>
Date: Thu, 10 Jun 2021 12:53:25 -0400
Subject: [PATCH 01/14] Upgrade outdated formulae with `brew install`

---
 Library/Homebrew/cmd/install.rb       | 24 ++++++++++++++++++++++++
 Library/Homebrew/formula_installer.rb |  7 +------
 2 files changed, 25 insertions(+), 6 deletions(-)

diff --git a/Library/Homebrew/cmd/install.rb b/Library/Homebrew/cmd/install.rb
index c7d079cb84..ecce00852b 100644
--- a/Library/Homebrew/cmd/install.rb
+++ b/Library/Homebrew/cmd/install.rb
@@ -396,6 +396,20 @@ module Homebrew
     f.print_tap_action
     build_options = f.build
 
+    if f.outdated? && !f.head?
+      formulae = [f] + f.old_installed_formulae
+      version_upgrade = "#{f.linked_version} -> #{f.pkg_version}"
+
+      oh1 <<~EOS
+        #{f.name} #{f.linked_version} is installed and out of date
+          Upgrading #{Formatter.identifier(f.name)} #{version_upgrade}
+      EOS
+      outdated_kegs = formulae.map(&:linked_keg)
+                              .select(&:directory?)
+                              .map { |k| Keg.new(k.resolved_path) }
+      linked_kegs = outdated_kegs.select(&:linked?)
+    end
+
     fi = FormulaInstaller.new(
       f,
       **{
@@ -419,6 +433,9 @@ module Homebrew
     )
     fi.prelude
     fi.fetch
+
+    outdated_kegs.each(&:unlink) if outdated_kegs.present?
+
     fi.install
     fi.finish
   rescue FormulaInstallationAlreadyAttemptedError
@@ -427,5 +444,12 @@ module Homebrew
     nil
   rescue CannotInstallFormulaError => e
     ofail e.message
+  ensure
+    begin
+      # Re-link kegs if upgrade fails
+      linked_kegs.each(&:link) unless formula.latest_version_installed?
+    rescue
+      nil
+    end
   end
 end
diff --git a/Library/Homebrew/formula_installer.rb b/Library/Homebrew/formula_installer.rb
index 1d9193dcab..cd5d6aa846 100644
--- a/Library/Homebrew/formula_installer.rb
+++ b/Library/Homebrew/formula_installer.rb
@@ -351,12 +351,7 @@ class FormulaInstaller
       message = <<~EOS
         #{formula.name} #{formula.linked_version} is already installed
       EOS
-      if formula.outdated? && !formula.head?
-        message += <<~EOS
-          To upgrade to #{formula.pkg_version}, run:
-            brew upgrade #{formula.full_name}
-        EOS
-      elsif only_deps?
+      if only_deps?
         message = nil
       else
         # some other version is already installed *and* linked

From b6cb3d2b6a69385648924e1be51efc282d9a1623 Mon Sep 17 00:00:00 2001
From: Connor Mann <connor@cnnrmnn.com>
Date: Thu, 10 Jun 2021 15:06:12 -0400
Subject: [PATCH 02/14] Add `HOMEBREW_NO_INSTALL_UPGRADE`

---
 Library/Homebrew/env_config.rb        | 4 ++++
 Library/Homebrew/formula_installer.rb | 7 ++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/Library/Homebrew/env_config.rb b/Library/Homebrew/env_config.rb
index def50503d5..039560e834 100644
--- a/Library/Homebrew/env_config.rb
+++ b/Library/Homebrew/env_config.rb
@@ -257,6 +257,10 @@ module Homebrew
                      "`HOMEBREW_CLEANUP_PERIODIC_FULL_DAYS` days.",
         boolean:     true,
       },
+      HOMEBREW_NO_INSTALL_UPGRADE:            {
+        description: "If set, `brew install` will not automatically upgrade installed and out of date formulae",
+        boolean:     true,
+      },
       HOMEBREW_PRY:                           {
         description: "If set, use Pry for the `brew irb` command.",
         boolean:     true,
diff --git a/Library/Homebrew/formula_installer.rb b/Library/Homebrew/formula_installer.rb
index cd5d6aa846..4beaf70323 100644
--- a/Library/Homebrew/formula_installer.rb
+++ b/Library/Homebrew/formula_installer.rb
@@ -351,7 +351,12 @@ class FormulaInstaller
       message = <<~EOS
         #{formula.name} #{formula.linked_version} is already installed
       EOS
-      if only_deps?
+      if Homebrew::EnvConfig.no_install_upgrade? && formula.outdated? && !formula.head?
+        message += <<~EOS
+          To upgrade to #{formula.pkg_version}, run:
+            brew upgrade #{formula.full_name}
+        EOS
+      elsif only_deps?
         message = nil
       else
         # some other version is already installed *and* linked

From 989e3cd2fa36c7e761551eebb1caabea308094f5 Mon Sep 17 00:00:00 2001
From: Connor Mann <connor@cnnrmnn.com>
Date: Fri, 11 Jun 2021 13:48:25 -0400
Subject: [PATCH 03/14] Update `HOMEBREW_NO_INSTALL_UPGRADE` description

---
 Library/Homebrew/env_config.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Library/Homebrew/env_config.rb b/Library/Homebrew/env_config.rb
index 039560e834..1a0aae3a4d 100644
--- a/Library/Homebrew/env_config.rb
+++ b/Library/Homebrew/env_config.rb
@@ -258,7 +258,7 @@ module Homebrew
         boolean:     true,
       },
       HOMEBREW_NO_INSTALL_UPGRADE:            {
-        description: "If set, `brew install` will not automatically upgrade installed and out of date formulae",
+        description: "If set, `brew install` will not automatically upgrade installed but outdated formulae",
         boolean:     true,
       },
       HOMEBREW_PRY:                           {

From 1ee0c1987eb5b94c117a05fc928193d2c74804e5 Mon Sep 17 00:00:00 2001
From: Connor Mann <connor@cnnrmnn.com>
Date: Fri, 11 Jun 2021 13:55:46 -0400
Subject: [PATCH 04/14] Skip unlinking if `HOMEBREW_NO_INSTALL_UPGRADE`

---
 Library/Homebrew/cmd/install.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Library/Homebrew/cmd/install.rb b/Library/Homebrew/cmd/install.rb
index ecce00852b..8e9aa2ee5c 100644
--- a/Library/Homebrew/cmd/install.rb
+++ b/Library/Homebrew/cmd/install.rb
@@ -396,7 +396,7 @@ module Homebrew
     f.print_tap_action
     build_options = f.build
 
-    if f.outdated? && !f.head?
+    if !Homebrew::EnvConfig.no_install_upgrade? && f.outdated? && !f.head?
       formulae = [f] + f.old_installed_formulae
       version_upgrade = "#{f.linked_version} -> #{f.pkg_version}"
 

From beb68dca299e6e3885c1134275ff686e7ac16cca Mon Sep 17 00:00:00 2001
From: Connor Mann <connor@cnnrmnn.com>
Date: Fri, 11 Jun 2021 14:24:39 -0400
Subject: [PATCH 05/14] Automatically upgrade outdated keg-only formulae

---
 Library/Homebrew/cmd/install.rb | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/Library/Homebrew/cmd/install.rb b/Library/Homebrew/cmd/install.rb
index 8e9aa2ee5c..ce319819f9 100644
--- a/Library/Homebrew/cmd/install.rb
+++ b/Library/Homebrew/cmd/install.rb
@@ -215,12 +215,16 @@ module Homebrew
         # dependencies. Therefore before performing other checks we need to be
         # sure --force flag is passed.
         if f.outdated?
-          optlinked_version = Keg.for(f.opt_prefix).version
-          onoe <<~EOS
-            #{f.full_name} #{optlinked_version} is already installed.
-            To upgrade to #{f.version}, run:
-              brew upgrade #{f.full_name}
-          EOS
+          if Homebrew::EnvConfig.no_install_upgrade?
+            optlinked_version = Keg.for(f.opt_prefix).version
+            onoe <<~EOS
+              #{f.full_name} #{optlinked_version} is already installed.
+              To upgrade to #{f.version}, run:
+                brew upgrade #{f.full_name}
+            EOS
+          else
+            installed_formulae << f
+          end
         elsif args.only_dependencies?
           installed_formulae << f
         elsif !args.quiet?

From 1b1fa3fed79daca28ee4e3123f70a6ec81bde0af Mon Sep 17 00:00:00 2001
From: Connor Mann <34930543+cnnrmnn@users.noreply.github.com>
Date: Mon, 14 Jun 2021 08:36:23 -0400
Subject: [PATCH 06/14] Update Library/Homebrew/cmd/install.rb

Co-authored-by: Mike McQuaid <mike@mikemcquaid.com>
---
 Library/Homebrew/cmd/install.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Library/Homebrew/cmd/install.rb b/Library/Homebrew/cmd/install.rb
index ce319819f9..6bf3912b7c 100644
--- a/Library/Homebrew/cmd/install.rb
+++ b/Library/Homebrew/cmd/install.rb
@@ -401,7 +401,7 @@ module Homebrew
     build_options = f.build
 
     if !Homebrew::EnvConfig.no_install_upgrade? && f.outdated? && !f.head?
-      formulae = [f] + f.old_installed_formulae
+      formulae = [f, *f.old_installed_formulae]
       version_upgrade = "#{f.linked_version} -> #{f.pkg_version}"
 
       oh1 <<~EOS

From 48641f3a3a0423004a7e6f8bae931e752b534f28 Mon Sep 17 00:00:00 2001
From: Connor Mann <connor@cnnrmnn.com>
Date: Mon, 14 Jun 2021 11:28:16 -0400
Subject: [PATCH 07/14] Fix method typo

---
 Library/Homebrew/install.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Library/Homebrew/install.rb b/Library/Homebrew/install.rb
index 8d7ef97e2d..1b28fff4f8 100644
--- a/Library/Homebrew/install.rb
+++ b/Library/Homebrew/install.rb
@@ -258,7 +258,7 @@ module Homebrew
             Upgrading #{Formatted.identifier(f.name)} #{version_upgrade}
         EOS
         outdated_kegs = outdated_formulae.map(&:linked_keg).select(&:directory?).map { |k| Keg.new(k.resolved_path) }
-        linked_kegs = outdated_kegs.select(&:linked)
+        linked_kegs = outdated_kegs.select(&:linked?)
       end
 
       fi = FormulaInstaller.new(

From 4bbfe351e20e53e3c52cfd3053cfe60b043c857a Mon Sep 17 00:00:00 2001
From: Connor Mann <connor@cnnrmnn.com>
Date: Mon, 14 Jun 2021 11:31:55 -0400
Subject: [PATCH 08/14] Fix keg re-linking logic for failed upgrades

---
 Library/Homebrew/install.rb | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/Library/Homebrew/install.rb b/Library/Homebrew/install.rb
index 1b28fff4f8..d87bcc72d2 100644
--- a/Library/Homebrew/install.rb
+++ b/Library/Homebrew/install.rb
@@ -255,7 +255,7 @@ module Homebrew
 
         oh1 <<~EOS
           #{f.name} #{f.linked_version} is installed and outdated
-            Upgrading #{Formatted.identifier(f.name)} #{version_upgrade}
+            Upgrading #{Formatter.identifier(f.name)} #{version_upgrade}
         EOS
         outdated_kegs = outdated_formulae.map(&:linked_keg).select(&:directory?).map { |k| Keg.new(k.resolved_path) }
         linked_kegs = outdated_kegs.select(&:linked?)
@@ -295,7 +295,11 @@ module Homebrew
       ofail e.message
     ensure
       # Re-link kegs if upgrade fails
-      linked_kegs.each(&:link) unless f.latest_version_installed?
+      begin
+        linked_kegs.each(&:link) unless f.latest_version_installed?
+        rescue
+          nil
+      end
     end
   end
 end

From c1ad3d09b833f496c9dfafce973830c08142afa9 Mon Sep 17 00:00:00 2001
From: Connor Mann <connor@cnnrmnn.com>
Date: Mon, 14 Jun 2021 11:42:49 -0400
Subject: [PATCH 09/14] Add `present?` check to `linked_kegs`

---
 Library/Homebrew/install.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Library/Homebrew/install.rb b/Library/Homebrew/install.rb
index d87bcc72d2..e285755f42 100644
--- a/Library/Homebrew/install.rb
+++ b/Library/Homebrew/install.rb
@@ -296,7 +296,7 @@ module Homebrew
     ensure
       # Re-link kegs if upgrade fails
       begin
-        linked_kegs.each(&:link) unless f.latest_version_installed?
+        linked_kegs.each(&:link) if linked_kegs.present? && !f.latest_version_installed?
         rescue
           nil
       end

From f0601e91bc6bbd9abbc5cf76acfd6685aabc5239 Mon Sep 17 00:00:00 2001
From: Connor Mann <connor@cnnrmnn.com>
Date: Mon, 14 Jun 2021 11:43:44 -0400
Subject: [PATCH 10/14] Change outdated message

---
 Library/Homebrew/install.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Library/Homebrew/install.rb b/Library/Homebrew/install.rb
index e285755f42..21b5716e6c 100644
--- a/Library/Homebrew/install.rb
+++ b/Library/Homebrew/install.rb
@@ -254,7 +254,7 @@ module Homebrew
         version_upgrade = "#{f.linked_version} -> #{f.pkg_version}"
 
         oh1 <<~EOS
-          #{f.name} #{f.linked_version} is installed and outdated
+          #{f.name} #{f.linked_version} is installed but outdated
             Upgrading #{Formatter.identifier(f.name)} #{version_upgrade}
         EOS
         outdated_kegs = outdated_formulae.map(&:linked_keg).select(&:directory?).map { |k| Keg.new(k.resolved_path) }

From 11d030e897e65af6c9d79b5cbed8789a2d844bc6 Mon Sep 17 00:00:00 2001
From: Connor Mann <connor@cnnrmnn.com>
Date: Tue, 15 Jun 2021 09:38:08 -0400
Subject: [PATCH 11/14] Update Library/Homebrew/install.rb

Co-authored-by: Mike McQuaid <mike@mikemcquaid.com>
---
 Library/Homebrew/install.rb | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Library/Homebrew/install.rb b/Library/Homebrew/install.rb
index 21b5716e6c..50347a3884 100644
--- a/Library/Homebrew/install.rb
+++ b/Library/Homebrew/install.rb
@@ -257,7 +257,9 @@ module Homebrew
           #{f.name} #{f.linked_version} is installed but outdated
             Upgrading #{Formatter.identifier(f.name)} #{version_upgrade}
         EOS
-        outdated_kegs = outdated_formulae.map(&:linked_keg).select(&:directory?).map { |k| Keg.new(k.resolved_path) }
+        outdated_kegs = outdated_formulae.map(&:linked_keg)
+                                         .select(&:directory?)
+                                         .map { |k| Keg.new(k.resolved_path) }
         linked_kegs = outdated_kegs.select(&:linked?)
       end
 

From 13e1457249ce68a158eae72300a3de4f7361c148 Mon Sep 17 00:00:00 2001
From: Connor Mann <connor@cnnrmnn.com>
Date: Tue, 15 Jun 2021 10:11:40 -0400
Subject: [PATCH 12/14] Consolidate shared install and upgrade logic

---
 Library/Homebrew/install.rb | 24 +++++++++---------------
 Library/Homebrew/upgrade.rb | 35 ++++++++++++++++++++++-------------
 2 files changed, 31 insertions(+), 28 deletions(-)

diff --git a/Library/Homebrew/install.rb b/Library/Homebrew/install.rb
index 50347a3884..48f75516d0 100644
--- a/Library/Homebrew/install.rb
+++ b/Library/Homebrew/install.rb
@@ -5,6 +5,7 @@ require "diagnostic"
 require "fileutils"
 require "hardware"
 require "development_tools"
+require "upgrade"
 
 module Homebrew
   # Helper module for performing (pre-)install checks.
@@ -249,20 +250,6 @@ module Homebrew
       f.print_tap_action
       build_options = f.build
 
-      if !Homebrew::EnvConfig.no_install_upgrade? && f.outdated? && !f.head?
-        outdated_formulae = [f, *f.old_installed_formulae]
-        version_upgrade = "#{f.linked_version} -> #{f.pkg_version}"
-
-        oh1 <<~EOS
-          #{f.name} #{f.linked_version} is installed but outdated
-            Upgrading #{Formatter.identifier(f.name)} #{version_upgrade}
-        EOS
-        outdated_kegs = outdated_formulae.map(&:linked_keg)
-                                         .select(&:directory?)
-                                         .map { |k| Keg.new(k.resolved_path) }
-        linked_kegs = outdated_kegs.select(&:linked?)
-      end
-
       fi = FormulaInstaller.new(
         f,
         options:                    build_options.used_options,
@@ -282,10 +269,17 @@ module Homebrew
         quiet:                      quiet,
         verbose:                    verbose,
       )
+
+      if !Homebrew::EnvConfig.no_install_upgrade? && f.outdated? && !f.head?
+        kegs = Upgrade.outdated_kegs(f)
+        linked_kegs = kegs.select(&:linked?)
+        Upgrade.print_upgrade_message(f, fi.options)
+      end
+
       fi.prelude
       fi.fetch
 
-      outdated_kegs.each(&:unlink) if outdated_kegs.present?
+      kegs.each(&:unlink) if kegs.present?
 
       fi.install
       fi.finish
diff --git a/Library/Homebrew/upgrade.rb b/Library/Homebrew/upgrade.rb
index 8c0f60b99c..4db35588eb 100644
--- a/Library/Homebrew/upgrade.rb
+++ b/Library/Homebrew/upgrade.rb
@@ -64,6 +64,24 @@ module Homebrew
       end
     end
 
+    def outdated_kegs(formula)
+      [formula, *formula.old_installed_formulae].map(&:linked_keg)
+                                                .select(&:directory?)
+                                                .map { |k| Keg.new(k.resolved_path) }
+    end
+
+    def print_upgrade_message(formula, fi_options)
+      version_upgrade = if formula.optlinked?
+        "#{Keg.new(formula.opt_prefix).version} -> #{formula.pkg_version}"
+      else
+        "-> #{formula.pkg_version}"
+      end
+      oh1 <<~EOS
+        Upgrading #{Formatter.identifier(formula.full_specified_name)}
+          #{version_upgrade} #{fi_options.to_a.join(" ")}
+      EOS
+    end
+
     def upgrade_formula(
       formula,
       flags:,
@@ -83,11 +101,8 @@ module Homebrew
         keg_was_linked = keg.linked?
       end
 
-      formulae_maybe_with_kegs = [formula] + formula.old_installed_formulae
-      outdated_kegs = formulae_maybe_with_kegs.map(&:linked_keg)
-                                              .select(&:directory?)
-                                              .map { |k| Keg.new(k.resolved_path) }
-      linked_kegs = outdated_kegs.select(&:linked?)
+      kegs = outdated_kegs(formula)
+      linked_kegs = kegs.select(&:linked?)
 
       if formula.opt_prefix.directory?
         keg = Keg.new(formula.opt_prefix.resolved_path)
@@ -118,13 +133,7 @@ module Homebrew
         }.compact,
       )
 
-      upgrade_version = if formula.optlinked?
-        "#{Keg.new(formula.opt_prefix).version} -> #{formula.pkg_version}"
-      else
-        "-> #{formula.pkg_version}"
-      end
-      oh1 "Upgrading #{Formatter.identifier(formula.full_specified_name)} " \
-          "#{upgrade_version} #{fi.options.to_a.join(" ")}"
+      print_upgrade_message(formula, fi.options)
 
       fi.prelude
       fi.fetch
@@ -132,7 +141,7 @@ module Homebrew
       # first we unlink the currently active keg for this formula otherwise it is
       # possible for the existing build to interfere with the build we are about to
       # do! Seriously, it happens!
-      outdated_kegs.each(&:unlink)
+      kegs.each(&:unlink)
 
       fi.install
       fi.finish

From bf9876c10fe11e5e415dab513e2ccfa69b32723c Mon Sep 17 00:00:00 2001
From: Connor Mann <connor@cnnrmnn.com>
Date: Tue, 15 Jun 2021 10:15:44 -0400
Subject: [PATCH 13/14] Update type declarations

---
 Library/Homebrew/sorbet/rbi/hidden-definitions/hidden.rbi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Library/Homebrew/sorbet/rbi/hidden-definitions/hidden.rbi b/Library/Homebrew/sorbet/rbi/hidden-definitions/hidden.rbi
index 944be741a5..d13d69b850 100644
--- a/Library/Homebrew/sorbet/rbi/hidden-definitions/hidden.rbi
+++ b/Library/Homebrew/sorbet/rbi/hidden-definitions/hidden.rbi
@@ -8233,6 +8233,8 @@ module Homebrew::EnvConfig
 
   def self.no_install_cleanup?(); end
 
+  def self.no_install_upgrade?(); end
+
   def self.no_installed_dependents_check?(); end
 
   def self.no_proxy(); end

From 79f9a9aac6f3aac6846898d9a9f6f95a75dd1625 Mon Sep 17 00:00:00 2001
From: Connor Mann <connor@cnnrmnn.com>
Date: Tue, 15 Jun 2021 15:59:00 -0400
Subject: [PATCH 14/14] Move `install`-specific code to `install.rb`

---
 Library/Homebrew/formula_installer.rb | 24 ------------------------
 Library/Homebrew/install.rb           | 27 +++++++++++++++++++++++----
 2 files changed, 23 insertions(+), 28 deletions(-)

diff --git a/Library/Homebrew/formula_installer.rb b/Library/Homebrew/formula_installer.rb
index b55e686fc4..027343a079 100644
--- a/Library/Homebrew/formula_installer.rb
+++ b/Library/Homebrew/formula_installer.rb
@@ -344,30 +344,6 @@ class FormulaInstaller
       Homebrew::Install.perform_build_from_source_checks
     end
 
-    # not in initialize so upgrade can unlink the active keg before calling this
-    # function but after instantiating this class so that it can avoid having to
-    # relink the active keg if possible (because it is slow).
-    if formula.linked_keg.directory?
-      message = <<~EOS
-        #{formula.name} #{formula.linked_version} is already installed
-      EOS
-      if Homebrew::EnvConfig.no_install_upgrade? && formula.outdated? && !formula.head?
-        message += <<~EOS
-          To upgrade to #{formula.pkg_version}, run:
-            brew upgrade #{formula.full_name}
-        EOS
-      elsif only_deps?
-        message = nil
-      else
-        # some other version is already installed *and* linked
-        message += <<~EOS
-          To install #{formula.pkg_version}, first run:
-            brew unlink #{formula.name}
-        EOS
-      end
-      raise CannotInstallFormulaError, message if message
-    end
-
     # Warn if a more recent version of this formula is available in the tap.
     begin
       if formula.pkg_version < (v = Formulary.factory(formula.full_name, force_bottle: force_bottle?).pkg_version)
diff --git a/Library/Homebrew/install.rb b/Library/Homebrew/install.rb
index 48f75516d0..4db75301ee 100644
--- a/Library/Homebrew/install.rb
+++ b/Library/Homebrew/install.rb
@@ -270,10 +270,29 @@ module Homebrew
         verbose:                    verbose,
       )
 
-      if !Homebrew::EnvConfig.no_install_upgrade? && f.outdated? && !f.head?
-        kegs = Upgrade.outdated_kegs(f)
-        linked_kegs = kegs.select(&:linked?)
-        Upgrade.print_upgrade_message(f, fi.options)
+      if f.linked_keg.directory?
+        if Homebrew::EnvConfig.no_install_upgrade?
+          message = <<~EOS
+            #{f.name} #{f.linked_version} is already installed
+          EOS
+          message += if f.outdated? && !f.head?
+            <<~EOS
+              To upgrade to #{f.pkg_version}, run:
+                brew upgrade #{f.full_name}
+            EOS
+          else
+            <<~EOS
+              To install #{f.pkg_version}, first run:
+                brew unlink #{f.name}
+            EOS
+          end
+          raise CannotInstallFormulaError, message unless only_deps
+        elsif f.outdated? && !f.head?
+          puts "#{f.name} #{f.linked_version} is installed but outdated"
+          kegs = Upgrade.outdated_kegs(f)
+          linked_kegs = kegs.select(&:linked?)
+          Upgrade.print_upgrade_message(f, fi.options)
+        end
       end
 
       fi.prelude