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:



123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
 
# 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.



47
48
49
 
# 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.



80
81
82
 
# 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.



83
84
85
 
# 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.



89
90
91
 
# 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.



86
87
88
 
# 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.



77
78
79
 
# 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.



53
54
55
 
# 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.



65
66
67
 
# 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.



62
63
64
 
# 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.



59
60
61
 
# 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.



74
75
76
 
# 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.



56
57
58
 
# 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.



68
69
70
 
# 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.



71
72
73
 
# 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.



50
51
52
 
# 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. 



105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
 
# 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) 


101
102
103
 
# 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. 



91
92
93
94
95
96
97
98
99
 
# 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. 



456
457
458
 
# File 'migrator.rb', line 456

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.



413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
 
# File 'migrator.rb', line 413

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. 



452
453
454
 
# File 'migrator.rb', line 452

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.



157
158
159
160
161
162
 
# 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) 


165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
 
# 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. 



323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
 
# File 'migrator.rb', line 323

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}"
  rescue Exception => e # rubocop:disable Lint/RescueException
    onoe "An unexpected error occurred during linking"
    puts e
    puts Utils::Backtrace.clean(e) if debug?
    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.



399
400
401
402
 
# File 'migrator.rb', line 399

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.



367
368
369
370
371
372
 
# File 'migrator.rb', line 367

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. 



192
193
194
195
196
197
198
 
# 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. 



460
461
462
463
464
465
 
# File 'migrator.rb', line 460

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. 



257
258
259
260
261
262
263
264
265
266
267
268
 
# File 'migrator.rb', line 257

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. 



204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
 
# 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 }
rescue Exception => e # rubocop:disable Lint/RescueException
  onoe "The migration did not complete successfully."
  puts e
  puts Utils::Backtrace.clean(e) if debug?
  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.



271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
 
# File 'migrator.rb', line 271

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) 


200
201
202
 
# 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. 



236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
 
# File 'migrator.rb', line 236

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. 



287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
 
# File 'migrator.rb', line 287

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. 



315
316
317
318
319
320
321
 
# File 'migrator.rb', line 315

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. 



307
308
309
310
311
312
313
 
# File 'migrator.rb', line 307

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.



405
406
407
408
409
410
 
# File 'migrator.rb', line 405

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.



385
386
387
388
389
390
391
392
393
394
395
396
 
# File 'migrator.rb', line 385

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. 



467
468
469
470
 
# File 'migrator.rb', line 467

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.



376
377
378
379
380
381
382
 
# File 'migrator.rb', line 376

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