Class: Migrator

Inherits:
Object
  • Object
show all
Defined in:
Library/Homebrew/migrator.rb

Defined Under Namespace

Classes: MigrationNeededError, MigratorDifferentTapsError, MigratorNoOldnameError, MigratorNoOldpathError

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(formula, force: ARGV.force?) ⇒ Migrator

Returns a new instance of Migrator



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# File 'Library/Homebrew/migrator.rb', line 107

def initialize(formula, force: ARGV.force?)
  @oldname = formula.oldname
  @newname = formula.name
  raise MigratorNoOldnameError, formula unless oldname

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

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

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

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

  if @old_linked_keg = linked_old_linked_keg
    @old_linked_keg_record = old_linked_keg.linked_keg_record if old_linked_keg.linked?
    @old_opt_record = old_linked_keg.opt_record if old_linked_keg.optlinked?
    @new_linked_keg_record = HOMEBREW_CELLAR/"#{newname}/#{File.basename(old_linked_keg)}"
  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

#formulaObject (readonly)

instance of new name formula



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# File 'Library/Homebrew/migrator.rb', line 44

def formula
  @formula
end

#new_cellarObject (readonly)

path to newname cellar according to new name



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# File 'Library/Homebrew/migrator.rb', line 77

def new_cellar
  @new_cellar
end

#new_cellar_existedObject (readonly)

true if new cellar existed at initialization time



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# File 'Library/Homebrew/migrator.rb', line 80

def new_cellar_existed
  @new_cellar_existed
end

#new_linked_keg_recordObject (readonly)

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



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# File 'Library/Homebrew/migrator.rb', line 86

def new_linked_keg_record
  @new_linked_keg_record
end

#new_pin_recordObject (readonly)

path to newname pin



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# File 'Library/Homebrew/migrator.rb', line 83

def new_pin_record
  @new_pin_record
end

#newnameObject (readonly)

new name of the formula



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# File 'Library/Homebrew/migrator.rb', line 74

def newname
  @newname
end

#old_cellarObject (readonly)

path to oldname's cellar



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# File 'Library/Homebrew/migrator.rb', line 50

def old_cellar
  @old_cellar
end

#old_linked_kegObject (readonly)

oldname linked keg



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# File 'Library/Homebrew/migrator.rb', line 59

def old_linked_keg
  @old_linked_keg
end

#old_linked_keg_recordObject (readonly)

path to oldname's linked keg



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# File 'Library/Homebrew/migrator.rb', line 62

def old_linked_keg_record
  @old_linked_keg_record
end

#old_opt_recordObject (readonly)

path to oldname opt



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# File 'Library/Homebrew/migrator.rb', line 56

def old_opt_record
  @old_opt_record
end

resolved path to oldname pin



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# File 'Library/Homebrew/migrator.rb', line 71

def old_pin_link_record
  @old_pin_link_record
end

#old_pin_recordObject (readonly)

path to oldname pin



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# File 'Library/Homebrew/migrator.rb', line 53

def old_pin_record
  @old_pin_record
end

#old_tabsObject (readonly)

tabs from oldname kegs



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# File 'Library/Homebrew/migrator.rb', line 65

def old_tabs
  @old_tabs
end

#old_tapObject (readonly)

tap of the old name



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# File 'Library/Homebrew/migrator.rb', line 68

def old_tap
  @old_tap
end

#oldnameObject (readonly)

old name of the formula



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# File 'Library/Homebrew/migrator.rb', line 47

def oldname
  @oldname
end

Class Method Details

.migrate_if_needed(formula) ⇒ Object



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# File 'Library/Homebrew/migrator.rb', line 97

def self.migrate_if_needed(formula)
  return unless Migrator.needs_migration?(formula)
  begin
    migrator = Migrator.new(formula)
    migrator.migrate
  rescue => e
    onoe e
  end
end

.needs_migration?(formula) ⇒ Boolean

Returns:

  • (Boolean)


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# File 'Library/Homebrew/migrator.rb', line 88

def self.needs_migration?(formula)
  oldname = formula.oldname
  return false unless oldname
  oldname_rack = HOMEBREW_CELLAR/oldname
  return false if oldname_rack.symlink?
  return false unless oldname_rack.directory?
  true
end

Instance Method Details

#backup_old_tabsObject



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# File 'Library/Homebrew/migrator.rb', line 401

def backup_old_tabs
  old_tabs.each(&:write)
end

#backup_oldnameObject

Backup everything if errors occurred while migrating.



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# File 'Library/Homebrew/migrator.rb', line 358

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
      newname_keg.uninstall if new_cellar_existed
    end
  end

  return if old_linked_keg.nil?
  # 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
  if old_linked_keg_record
    begin
      old_linked_keg.link
    rescue Keg::LinkError
      old_linked_keg.unlink
      raise
    rescue Keg::AlreadyLinkedError
      old_linked_keg.unlink
      retry
    end
  else
    old_linked_keg.optlink
  end
end

#backup_oldname_cellarObject



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# File 'Library/Homebrew/migrator.rb', line 397

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

#fix_tabsObject

Fix INSTALL_RECEIPTS for tap-migrated formula.



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# File 'Library/Homebrew/migrator.rb', line 139

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

#from_same_tap_user?Boolean

Returns:

  • (Boolean)


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# File 'Library/Homebrew/migrator.rb', line 146

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[formula.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


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# File 'Library/Homebrew/migrator.rb', line 271

def link_newname
  oh1 "Linking #{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_linked_keg_record
    begin
      new_keg.optlink
    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
  rescue Keg::ConflictError => e
    onoe "Error while executing `brew link` step on #{newname}"
    puts e
    puts
    puts "Possible conflicting files are:"
    mode = OpenStruct.new(dry_run: true, overwrite: true)
    new_keg.link(mode)
    raise
  rescue Keg::LinkError => e
    onoe "Error while linking"
    puts e
    puts
    puts "You can try again using:"
    puts "  brew link #{formula.name}"
  rescue Exception => e # rubocop:disable Lint/RescueException
    onoe "An unexpected error occurred during linking"
    puts e
    puts e.backtrace if ARGV.debug?
    ignore_interrupts { new_keg.unlink }
    raise
  end
end

Remove old_cellar if it exists



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# File 'Library/Homebrew/migrator.rb', line 344

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

Link keg to opt if it was linked before migrating.



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# File 'Library/Homebrew/migrator.rb', line 316

def link_oldname_opt
  return unless old_opt_record
  old_opt_record.delete if old_opt_record.symlink?
  old_opt_record.make_relative_symlink(new_linked_keg_record)
end

#linked_old_linked_kegObject



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# File 'Library/Homebrew/migrator.rb', line 173

def linked_old_linked_keg
  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.detect(&:linked?) || kegs.detect(&:optlinked?)
end

#lockObject



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# File 'Library/Homebrew/migrator.rb', line 405

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

#migrateObject



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# File 'Library/Homebrew/migrator.rb', line 185

def migrate
  oh1 "Migrating #{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_keg.nil?
  update_tabs
rescue Interrupt
  ignore_interrupts { backup_oldname }
rescue Exception => e # rubocop:disable Lint/RescueException
  onoe "Error occurred while migrating."
  puts e
  puts e.backtrace if ARGV.debug?
  puts "Backing up..."
  ignore_interrupts { backup_oldname }
ensure
  unlock
end

#move_to_new_directoryObject

move everything from Cellar/oldname to Cellar/newname



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# File 'Library/Homebrew/migrator.rb', line 209

def move_to_new_directory
  return unless old_cellar.exist?

  if new_cellar.exist?
    conflicted = false
    old_cellar.each_child do |c|
      next unless (new_cellar/c.basename).exist?
      begin
        FileUtils.rm_rf c
      rescue Errno::EACCES
        conflicted = true
        onoe "#{new_cellar/c.basename} already exists."
      end
    end

    if conflicted
      odie "Remove #{new_cellar} manually and run brew migrate #{oldname}."
    end
  end

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

#pinned?Boolean

Returns:

  • (Boolean)


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# File 'Library/Homebrew/migrator.rb', line 181

def pinned?
  @pinned
end

#repinObject



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# File 'Library/Homebrew/migrator.rb', line 237

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 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


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# File 'Library/Homebrew/migrator.rb', line 263

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


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# File 'Library/Homebrew/migrator.rb', line 255

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

Remove Cellar/oldname link if it belongs to newname.



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# File 'Library/Homebrew/migrator.rb', line 350

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

Remove opt/oldname link if it belongs to newname.



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# File 'Library/Homebrew/migrator.rb', line 333

def unlink_oldname_opt
  return unless old_opt_record
  if old_opt_record.symlink? && old_opt_record.exist? \
      && new_linked_keg_record.exist? \
      && new_linked_keg_record.realpath == old_opt_record.realpath
    old_opt_record.unlink
    old_opt_record.parent.rmdir_if_possible
  end
end

#unlockObject



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# File 'Library/Homebrew/migrator.rb', line 412

def unlock
  @newname_lock.unlock
  @oldname_lock.unlock
end

#update_tabsObject

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



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# File 'Library/Homebrew/migrator.rb', line 324

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