various: add remote migration hack

xu-cheng · xu-cheng · commit d32d78da0880 · 2016-04-03T18:44:20.000+08:00
Depends on what local revision users start with, there will be several places which can be used to trigger remote migrations. * `tap_migrations`: some old system will load `tap_migrations` during `brew update` * `formula_revision`: old system whose revision is after c010cc8 but before ac5707c will load `formula_revision` during `brew update`. This will help to solve #42553 on these systems * `update-reporter`: system since we implement bash update script. Closes #50653. Signed-off-by: Xu Cheng <xucheng@me.com>
diff --git a/Library/Homebrew/cmd/update-report.rb b/Library/Homebrew/cmd/update-report.rb
@@ -1,3 +1,6 @@
+# This is a hack to force old Homebrew to perform core/formula separation migration.
+require "migrate_remote"
+
 require "formula_versions"
 require "migrator"
 require "formulary"
diff --git a/Library/Homebrew/formula_versions.rb b/Library/Homebrew/formula_versions.rb
@@ -1,4 +1,7 @@
 require "formula"
+# This is a hack to force old Homebrew to perform core/formula separation migration.
+# On some old system, `brew update` will try to load `formula_versions.rb` file.
+require "migrate_remote"
 
 class FormulaVersions
   IGNORED_EXCEPTIONS = [
diff --git a/Library/Homebrew/migrate_remote.rb b/Library/Homebrew/migrate_remote.rb
@@ -0,0 +1,9 @@
+
+def migrate_remote!
+  # only perform the migration when invoked by update.rb or update-report.rb
+  return unless Kernel.caller.any? { |f| f.include?("update") }
+  oh1 "Migrating Homebrew to v0.9.9"
+  exec HOMEBREW_BREW_FILE, "update"
+end
+
+migrate_remote!
diff --git a/Library/Homebrew/tap_migrations.rb b/Library/Homebrew/tap_migrations.rb
@@ -1,3 +1,7 @@
+# This is a hack to force old Homebrew to perform core/formula separation migration.
+# On some old system, `brew update` will try to load `tap_migrations.rb` file.
+require "migrate_remote"
+
 TAP_MIGRATIONS = {
   "adobe-air-sdk" => "homebrew/binary",
   "afuse" => "homebrew/fuse",
