Merge pull request #1757 from alyssais/moved_formula

keg: handle dependencies of moved/renamed formulae

Library/Homebrew/keg.rb

@@ -126,7 +126,18 @@ class Keg
     end
 
     keg_names = kegs.map(&:name)
-    kegs_by_source = kegs.group_by { |k| [k.name, Tab.for_keg(k).tap] }
+    kegs_by_source = kegs.group_by do |keg|
+      begin
+        # First, attempt to resolve the keg to a formula
+        # to get up-to-date name and tap information.
+        f = keg.to_formula
+        [f.name, f.tap]
+      rescue FormulaUnavailableError
+        # If the formula for the keg can't be found,
+        # fall back to the information in the tab.
+        [keg.name, Tab.for_keg(keg).tap]
+      end
+    end
 
     remaining_formulae.each do |dependent|
       required = dependent.missing_dependencies(hide: keg_names)

Library/Homebrew/test/keg_test.rb

@@ -373,9 +373,15 @@ class InstalledDependantsTests < LinkTestCase
       t.source["tap"] = "some/tap"
       t.source["path"] = nil
     end
+
     dependencies [{ "full_name" => "some/tap/foo", "version" => "1.0" }]
     assert_equal [@dependent], @keg.installed_dependents
     assert_equal [[@keg], ["bar 1.0"]], Keg.find_some_installed_dependents([@keg])
+
+    dependencies nil
+    # It doesn't make sense for a keg with no formula to have any dependents,
+    # so that can't really be tested.
+    assert_nil Keg.find_some_installed_dependents([@keg])
   end
 
   def test_a_dependency_with_no_tap_in_tab
@@ -388,7 +394,7 @@ class InstalledDependantsTests < LinkTestCase
     Formula["bar"].class.depends_on "baz"
 
     result = Keg.find_some_installed_dependents([@keg, @tap_dep])
-    assert_equal [[@tap_dep], ["bar"]], result
+    assert_equal [[@keg, @tap_dep], ["bar"]], result
   end
 
   def test_no_dependencies_anywhere
@@ -411,6 +417,23 @@ class InstalledDependantsTests < LinkTestCase
     assert_nil Keg.find_some_installed_dependents([@keg, @dependent])
   end
 
+  def test_renamed_dependency
+    dependencies nil
+
+    stub_formula_loader Formula["foo"], "homebrew/core/foo-old"
+    renamed_path = HOMEBREW_CELLAR/"foo-old"
+    (HOMEBREW_CELLAR/"foo").rename(renamed_path)
+    renamed_keg = Keg.new(renamed_path.join("1.0"))
+
+    Formula["bar"].class.depends_on "foo"
+
+    result = Keg.find_some_installed_dependents([renamed_keg])
+    assert_equal [[renamed_keg], ["bar"]], result
+  ensure
+    # Move it back to where it was so it'll be cleaned up.
+    (HOMEBREW_CELLAR/"foo-old").rename(HOMEBREW_CELLAR/"foo")
+  end
+
   def test_empty_dependencies_in_tab
     dependencies []
     assert_empty @keg.installed_dependents