Class: Migrator Private

Inherits:
Object show all
Includes:
Context
Defined in:
migrator.rb

Overview

This class is part of a private API. This class may only be used in the Homebrew/brew repository. Third parties should avoid using this class if possible, as it may be removed or changed without warning.

Helper class for migrating a formula from an old to a new name.

Defined Under Namespace

Classes: MigrationNeededError, MigratorDifferentTapsError, MigratorNoOldpathError

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Context

current, current=, #debug?, #quiet?, #verbose?, #with_context

Constructor Details

#initialize(formula, oldname, force: false) ⇒ Migrator

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Returns a new instance of Migrator.

Raises:



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# File 'migrator.rb', line 123

def initialize(formula, oldname, force: false)
  @oldname = oldname
  @newname = formula.name

  @formula = formula
  @old_cellar = HOMEBREW_CELLAR/oldname
  raise MigratorNoOldpathError, oldname unless old_cellar.exist?

  @old_tabs = old_cellar.subdirs.map { |d| Keg.new(d).tab }
  @old_tap = old_tabs.first.tap

  raise MigratorDifferentTapsError.new(formula, oldname, old_tap) if !force && !from_same_tap_user?

  @new_cellar = HOMEBREW_CELLAR/formula.name
  @new_cellar_existed = @new_cellar.exist?

  @old_linked_kegs = linked_old_linked_kegs
  @old_full_linked_kegs = []
  @old_opt_records = []
  old_linked_kegs.each do |old_linked_keg|
    @old_full_linked_kegs << old_linked_keg if old_linked_keg.linked?
    @old_opt_records << old_linked_keg.opt_record if old_linked_keg.optlinked?
  end
  unless old_linked_kegs.empty?
    @new_linked_keg_record = HOMEBREW_CELLAR/"#{newname}/#{File.basename(old_linked_kegs.first)}"
  end

  @old_pin_record = HOMEBREW_PINNED_KEGS/oldname
  @new_pin_record = HOMEBREW_PINNED_KEGS/newname
  @pinned = old_pin_record.symlink?
  @old_pin_link_record = old_pin_record.readlink if @pinned
end

Instance Attribute Details

#formula ⇒ Object (readonly)

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Instance of renamed formula.



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# File 'migrator.rb', line 47

def formula
  @formula
end

#new_cellar ⇒ Object (readonly)

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Path to newname cellar according to new name.



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# File 'migrator.rb', line 80

def new_cellar
  @new_cellar
end

#new_cellar_existed ⇒ Object (readonly)

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

True if new cellar existed at initialization time.



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# File 'migrator.rb', line 83

def new_cellar_existed
  @new_cellar_existed
end

#new_linked_keg_record ⇒ Object (readonly)

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Path to newname keg that will be linked if old_linked_keg isn't nil.



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# File 'migrator.rb', line 89

def new_linked_keg_record
  @new_linked_keg_record
end

#new_pin_record ⇒ Object (readonly)

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Path to newname pin.



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# File 'migrator.rb', line 86

def new_pin_record
  @new_pin_record
end

#newname ⇒ Object (readonly)

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

New name of the formula.



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# File 'migrator.rb', line 77

def newname
  @newname
end

#old_cellar ⇒ Object (readonly)

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Path to oldname's cellar.



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# File 'migrator.rb', line 53

def old_cellar
  @old_cellar
end

#old_full_linked_kegs ⇒ Object (readonly)

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Oldname linked kegs that were fully linked.



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# File 'migrator.rb', line 65

def old_full_linked_kegs
  @old_full_linked_kegs
end

#old_linked_kegs ⇒ Object (readonly)

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Oldname linked kegs.



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# File 'migrator.rb', line 62

def old_linked_kegs
  @old_linked_kegs
end

#old_opt_records ⇒ Object (readonly)

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Path to oldname opt.



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# File 'migrator.rb', line 59

def old_opt_records
  @old_opt_records
end

#old_pin_link_record ⇒ Object (readonly)

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Resolved path to oldname pin.



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# File 'migrator.rb', line 74

def old_pin_link_record
  @old_pin_link_record
end

#old_pin_record ⇒ Object (readonly)

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Path to oldname pin.



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# File 'migrator.rb', line 56

def old_pin_record
  @old_pin_record
end

#old_tabs ⇒ Object (readonly)

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Tabs from oldname kegs.



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# File 'migrator.rb', line 68

def old_tabs
  @old_tabs
end

#old_tap ⇒ Object (readonly)

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Tap of the old name.



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# File 'migrator.rb', line 71

def old_tap
  @old_tap
end

#oldname ⇒ Object (readonly)

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Old name of the formula.



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# File 'migrator.rb', line 50

def oldname
  @oldname
end

Class Method Details

.migrate_if_needed(formula, force:, dry_run: false) ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning. 



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# File 'migrator.rb', line 105

def self.migrate_if_needed(formula, force:, dry_run: false)
  oldnames = Migrator.oldnames_needing_migration(formula)

  begin
    oldnames.each do |oldname|
      if dry_run
        oh1 "Would migrate formula #{Formatter.identifier(oldname)} to #{Formatter.identifier(formula.name)}"
        next
      end

      migrator = Migrator.new(formula, oldname, force:)
      migrator.migrate
    end
  rescue => e
    onoe e
  end
end

.needs_migration?(formula) ⇒ Boolean

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Returns:

  • (Boolean) 


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# File 'migrator.rb', line 101

def self.needs_migration?(formula)
  !oldnames_needing_migration(formula).empty?
end

.oldnames_needing_migration(formula) ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning. 



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# File 'migrator.rb', line 91

def self.oldnames_needing_migration(formula)
  formula.oldnames.select do |oldname|
    oldname_rack = HOMEBREW_CELLAR/oldname
    next false if oldname_rack.symlink?
    next false unless oldname_rack.directory?

    true
  end
end

Instance Method Details

#backup_old_tabs ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning. 



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# File 'migrator.rb', line 464

def backup_old_tabs
  old_tabs.each(&:write)
end

#backup_oldname ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Backup everything if errors occur while migrating.



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# File 'migrator.rb', line 421

def backup_oldname
  unlink_oldname_opt
  unlink_oldname_cellar
  backup_oldname_cellar
  backup_old_tabs

  if pinned? && !old_pin_record.symlink?
    src_oldname = (old_pin_record.dirname/old_pin_link_record).expand_path
    old_pin_record.make_relative_symlink(src_oldname)
    new_pin_record.delete
  end

  if new_cellar.exist?
    new_cellar.subdirs.each do |d|
      newname_keg = Keg.new(d)
      newname_keg.unlink(verbose: verbose?)
      newname_keg.uninstall unless new_cellar_existed
    end
  end

  return if old_linked_kegs.empty?

  # The keg used to be linked and when we backup everything we restore
  # Cellar/oldname, the target also gets restored, so we are able to
  # create a keg using its old path
  old_full_linked_kegs.each do |old_linked_keg|
    old_linked_keg.link(verbose: verbose?)
  rescue Keg::LinkError
    old_linked_keg.unlink(verbose: verbose?)
    raise
  rescue Keg::AlreadyLinkedError
    old_linked_keg.unlink(verbose: verbose?)
    retry
  end
  (old_linked_kegs - old_full_linked_kegs).each do |old_linked_keg|
    old_linked_keg.optlink(verbose: verbose?)
  end
end

#backup_oldname_cellar ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning. 



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# File 'migrator.rb', line 460

def backup_oldname_cellar
  FileUtils.mv(new_cellar, old_cellar) unless old_cellar.exist?
end

#fix_tabs ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Fix INSTALL_RECEIPTs for tap-migrated formula.



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# File 'migrator.rb', line 157

def fix_tabs
  old_tabs.each do |tab|
    tab.tap = formula.tap
    tab.write
  end
end

#from_same_tap_user? ⇒ Boolean

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Returns:

  • (Boolean) 


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# File 'migrator.rb', line 165

def from_same_tap_user?
  formula_tap_user = formula.tap.user if formula.tap
  old_tap_user = nil

  new_tap = if old_tap
    old_tap_user, = old_tap.user
    if (migrate_tap = old_tap.tap_migrations[oldname])
      new_tap_user, new_tap_repo = migrate_tap.split("/")
      "#{new_tap_user}/#{new_tap_repo}"
    end
  end

  if formula_tap_user == old_tap_user
    true
  # Homebrew didn't use to update tabs while performing tap-migrations,
  # so there can be `INSTALL_RECEIPT`s containing wrong information about tap,
  # so we check if there is an entry about oldname migrated to tap and if
  # newname's tap is the same as tap to which oldname migrated, then we
  # can perform migrations and the taps for oldname and newname are the same.
  elsif formula.tap && old_tap && formula.tap == new_tap
    fix_tabs
    true
  else
    false
  end
end

#link_newname ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning. 



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# File 'migrator.rb', line 327

def link_newname
  oh1 "Relinking #{Formatter.identifier(newname)}"
  new_keg = Keg.new(new_linked_keg_record)

  # If old_keg wasn't linked then we just optlink a keg.
  # If old keg wasn't optlinked and linked, we don't call this method at all.
  # If formula is keg-only we also optlink it.
  if formula.keg_only? || old_full_linked_kegs.empty?
    begin
      new_keg.optlink(verbose: verbose?)
    rescue Keg::LinkError => e
      onoe "Failed to create #{formula.opt_prefix}"
      raise
    end
    return
  end

  new_keg.remove_linked_keg_record if new_keg.linked?

  begin
    new_keg.link(overwrite: true, verbose: verbose?)
  rescue Keg::ConflictError => e
    onoe "The `brew link` step did not complete successfully."
    puts e
    puts
    puts "Possible conflicting files are:"
    new_keg.link(dry_run: true, overwrite: true, verbose: verbose?)
    raise
  rescue Keg::LinkError => e
    onoe "The `brew link` step did not complete successfully."
    puts e
    puts
    puts "You can try again using:"
    puts "  brew link #{formula.name}"
  # Any exception means the `brew link` step did not complete.
  rescue Exception => e # rubocop:disable Lint/RescueException
    onoe "An unexpected error occurred during linking"
    puts e
    if debug?
      require "utils/backtrace"
      puts Utils::Backtrace.clean(e)
    end
    ignore_interrupts { new_keg.unlink(verbose: verbose?) }
    raise
  end
end

#link_oldname_cellar ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Remove Cellar/oldname if it exists.



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# File 'migrator.rb', line 407

def link_oldname_cellar
  old_cellar.delete if old_cellar.symlink? || old_cellar.exist?
  old_cellar.make_relative_symlink(formula.rack)
end

#link_oldname_opt ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Link keg to opt if it was linked before migrating.



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# File 'migrator.rb', line 375

def link_oldname_opt
  old_opt_records.each do |old_opt_record|
    old_opt_record.delete if old_opt_record.symlink?
    old_opt_record.make_relative_symlink(new_linked_keg_record)
  end
end

#linked_old_linked_kegs ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning. 



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# File 'migrator.rb', line 192

def linked_old_linked_kegs
  keg_dirs = []
  keg_dirs += new_cellar.subdirs if new_cellar.exist?
  keg_dirs += old_cellar.subdirs
  kegs = keg_dirs.map { |d| Keg.new(d) }
  kegs.select { |keg| keg.linked? || keg.optlinked? }
end

#lock ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning. 



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# File 'migrator.rb', line 468

def lock
  @newname_lock = FormulaLock.new newname
  @oldname_lock = FormulaLock.new oldname
  @newname_lock.lock
  @oldname_lock.lock
end

#merge_directory(directory) ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning. 



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# File 'migrator.rb', line 261

def merge_directory(directory)
  directory.each_child do |c|
    new_path = new_cellar/c.relative_path_from(old_cellar)

    if c.directory? && !c.symlink? && new_path.exist?
      merge_directory(c)
      c.unlink
    else
      FileUtils.mv(c, new_path)
    end
  end
end

#migrate ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning. 



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# File 'migrator.rb', line 204

def migrate
  oh1 "Migrating formula #{Formatter.identifier(oldname)} to #{Formatter.identifier(newname)}"
  lock
  unlink_oldname
  unlink_newname if new_cellar.exist?
  repin
  move_to_new_directory
  link_oldname_cellar
  link_oldname_opt
  link_newname unless old_linked_kegs.empty?
  update_tabs
  return unless formula.outdated?

  opoo <<~EOS
    #{Formatter.identifier(newname)} is outdated!
    To avoid broken installations, as soon as possible please run:
      brew upgrade
    Or, if you're OK with a less reliable fix:
      brew upgrade #{newname}
  EOS
rescue Interrupt
  ignore_interrupts { backup_oldname }
# Any exception means the migration did not complete.
rescue Exception => e # rubocop:disable Lint/RescueException
  onoe "The migration did not complete successfully."
  puts e
  if debug?
    require "utils/backtrace"
    puts Utils::Backtrace.clean(e)
  end
  puts "Backing up..."
  ignore_interrupts { backup_oldname }
ensure
  unlock
end

#move_to_new_directory ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Move everything from Cellar/oldname to Cellar/newname.



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# File 'migrator.rb', line 275

def move_to_new_directory
  return unless old_cellar.exist?

  if new_cellar.exist?
    conflicted = remove_conflicts(old_cellar)
    odie "Remove #{new_cellar} and #{old_cellar} manually and run `brew reinstall #{newname}`." if conflicted
  end

  oh1 "Moving #{Formatter.identifier(oldname)} versions to #{new_cellar}"
  if new_cellar.exist?
    merge_directory(old_cellar)
  else
    FileUtils.mv(old_cellar, new_cellar)
  end
end

#pinned? ⇒ Boolean

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Returns:

  • (Boolean) 


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# File 'migrator.rb', line 200

def pinned?
  @pinned
end

#remove_conflicts(directory) ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning. 



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# File 'migrator.rb', line 240

def remove_conflicts(directory)
  conflicted = T.let(false, T::Boolean)

  directory.each_child do |c|
    if c.directory? && !c.symlink?
      conflicted ||= remove_conflicts(c)
    else
      next unless (new_cellar/c.relative_path_from(old_cellar)).exist?

      begin
        FileUtils.rm_rf c
      rescue Errno::EACCES
        conflicted = true
        onoe "#{new_cellar/c.basename} already exists."
      end
    end
  end

  conflicted
end

#repin ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning. 



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# File 'migrator.rb', line 291

def repin
  return unless pinned?

  # `old_pin_record` is a relative symlink and when we try to to read it
  # from <dir> we actually try to find file
  # <dir>/../<...>/../Cellar/name/version.
  # To repin formula we need to update the link thus that it points to
  # the right directory.
  #
  # NOTE: `old_pin_record.realpath.sub(oldname, newname)` is unacceptable
  # here, because it resolves every symlink for `old_pin_record` and then
  # substitutes oldname with newname. It breaks things like
  # `Pathname#make_relative_symlink`, where `Pathname#relative_path_from`
  # is used to find the relative path from source to destination parent
  # and it assumes no symlinks.
  src_oldname = (old_pin_record.dirname/old_pin_link_record).expand_path
  new_pin_record.make_relative_symlink(src_oldname.sub(oldname, newname))
  old_pin_record.delete
end

#unlink_newname ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning. 



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# File 'migrator.rb', line 319

def unlink_newname
  oh1 "Temporarily unlinking #{Formatter.identifier(newname)}"
  new_cellar.subdirs.each do |d|
    keg = Keg.new(d)
    keg.unlink(verbose: verbose?)
  end
end

#unlink_oldname ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning. 



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# File 'migrator.rb', line 311

def unlink_oldname
  oh1 "Unlinking #{Formatter.identifier(oldname)}"
  old_cellar.subdirs.each do |d|
    keg = Keg.new(d)
    keg.unlink(verbose: verbose?)
  end
end

#unlink_oldname_cellar ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Remove Cellar/oldname link if it belongs to newname.



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# File 'migrator.rb', line 413

def unlink_oldname_cellar
  if (old_cellar.symlink? && !old_cellar.exist?) ||
     (old_cellar.symlink? && formula.rack.exist? && formula.rack.realpath == old_cellar.realpath)
    old_cellar.unlink
  end
end

#unlink_oldname_opt ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Remove opt/oldname link if it belongs to newname.



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# File 'migrator.rb', line 393

def unlink_oldname_opt
  return unless new_linked_keg_record.exist?

  old_opt_records.each do |old_opt_record|
    next unless old_opt_record.symlink?
    next unless old_opt_record.exist?
    next if new_linked_keg_record.realpath != old_opt_record.realpath

    old_opt_record.unlink
    old_opt_record.parent.rmdir_if_possible
  end
end

#unlock ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning. 



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# File 'migrator.rb', line 475

def unlock
  @newname_lock.unlock
  @oldname_lock.unlock
end

#update_tabs ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

After migration every INSTALL_RECEIPT.json has the wrong path to the formula so we must update INSTALL_RECEIPTs.



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# File 'migrator.rb', line 384

def update_tabs
  new_tabs = new_cellar.subdirs.map { |d| Keg.new(d).tab }
  new_tabs.each do |tab|
    tab.source["path"] = formula.path.to_s if tab.source["path"]
    tab.write
  end
end