chiark - git - mdw - stgit/blob - stgit/stack.py

   1 """Basic quilt-like functionality
   2 """
   3
   4 __copyright__ = """
   5 Copyright (C) 2005, Catalin Marinas <catalin.marinas@gmail.com>
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License version 2 as
   9 published by the Free Software Foundation.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19 """
  20
  21 import sys, os
  22
  23 from stgit.utils import *
  24 from stgit import git
  25 from stgit.config import config
  26
  27
  28 # stack exception class
  29 class StackException(Exception):
  30     pass
  31
  32 class FilterUntil:
  33     def __init__(self):
  34         self.should_print = True
  35     def __call__(self, x, until_test, prefix):
  36         if until_test(x):
  37             self.should_print = False
  38         if self.should_print:
  39             return x[0:len(prefix)] != prefix
  40         return False
  41
  42 #
  43 # Functions
  44 #
  45 __comment_prefix = 'STG:'
  46 __patch_prefix = 'STG_PATCH:'
  47
  48 def __clean_comments(f):
  49     """Removes lines marked for status in a commit file
  50     """
  51     f.seek(0)
  52
  53     # remove status-prefixed lines
  54     lines = f.readlines()
  55
  56     patch_filter = FilterUntil()
  57     until_test = lambda t: t == (__patch_prefix + '\n')
  58     lines = [l for l in lines if patch_filter(l, until_test, __comment_prefix)]
  59
  60     # remove empty lines at the end
  61     while len(lines) != 0 and lines[-1] == '\n':
  62         del lines[-1]
  63
  64     f.seek(0); f.truncate()
  65     f.writelines(lines)
  66
  67 def edit_file(series, string, comment, show_patch = True):
  68     fname = '.stgit.msg'
  69     tmpl = os.path.join(git.base_dir, 'patchdescr.tmpl')
  70
  71     f = file(fname, 'w+')
  72     if string:
  73         print >> f, string
  74     elif os.path.isfile(tmpl):
  75         print >> f, file(tmpl).read().rstrip()
  76     else:
  77         print >> f
  78     print >> f, __comment_prefix, comment
  79     print >> f, __comment_prefix, \
  80           'Lines prefixed with "%s" will be automatically removed.' \
  81           % __comment_prefix
  82     print >> f, __comment_prefix, \
  83           'Trailing empty lines will be automatically removed.'
  84
  85     if show_patch:
  86        print >> f, __patch_prefix
  87        # series.get_patch(series.get_current()).get_top()
  88        git.diff([], series.get_patch(series.get_current()).get_bottom(), None, f)
  89
  90     #Vim modeline must be near the end.
  91     print >> f, __comment_prefix, 'vi: set textwidth=75 filetype=diff:'
  92     f.close()
  93
  94     # the editor
  95     if config.has_option('stgit', 'editor'):
  96         editor = config.get('stgit', 'editor')
  97     elif 'EDITOR' in os.environ:
  98         editor = os.environ['EDITOR']
  99     else:
 100         editor = 'vi'
 101     editor += ' %s' % fname
 102
 103     print 'Invoking the editor: "%s"...' % editor,
 104     sys.stdout.flush()
 105     print 'done (exit code: %d)' % os.system(editor)
 106
 107     f = file(fname, 'r+')
 108
 109     __clean_comments(f)
 110     f.seek(0)
 111     string = f.read()
 112
 113     f.close()
 114     os.remove(fname)
 115
 116     return string
 117
 118 #
 119 # Classes
 120 #
 121
 122 class Patch:
 123     """Basic patch implementation
 124     """
 125     def __init__(self, name, patch_dir):
 126         self.__patch_dir = patch_dir
 127         self.__name = name
 128         self.__dir = os.path.join(self.__patch_dir, self.__name)
 129
 130     def create(self):
 131         os.mkdir(self.__dir)
 132         create_empty_file(os.path.join(self.__dir, 'bottom'))
 133         create_empty_file(os.path.join(self.__dir, 'top'))
 134
 135     def delete(self):
 136         for f in os.listdir(self.__dir):
 137             os.remove(os.path.join(self.__dir, f))
 138         os.rmdir(self.__dir)
 139
 140     def get_name(self):
 141         return self.__name
 142
 143     def rename(self, newname):
 144         olddir = self.__dir
 145         self.__name = newname
 146         self.__dir = os.path.join(self.__patch_dir, self.__name)
 147
 148         os.rename(olddir, self.__dir)
 149
 150     def __get_field(self, name, multiline = False):
 151         id_file = os.path.join(self.__dir, name)
 152         if os.path.isfile(id_file):
 153             string = read_string(id_file, multiline)
 154             if string == '':
 155                 return None
 156             else:
 157                 return string
 158         else:
 159             return None
 160
 161     def __set_field(self, name, string, multiline = False):
 162         fname = os.path.join(self.__dir, name)
 163         if string and string != '':
 164             write_string(fname, string, multiline)
 165         elif os.path.isfile(fname):
 166             os.remove(fname)
 167
 168     def get_bottom(self):
 169         return self.__get_field('bottom')
 170
 171     def set_bottom(self, string, backup = False):
 172         if backup:
 173             curr = self.__get_field('bottom')
 174             if curr != string:
 175                 self.__set_field('bottom.old', curr)
 176             else:
 177                 self.__set_field('bottom.old', None)
 178         self.__set_field('bottom', string)
 179
 180     def get_top(self):
 181         return self.__get_field('top')
 182
 183     def set_top(self, string, backup = False):
 184         if backup:
 185             curr = self.__get_field('top')
 186             if curr != string:
 187                 self.__set_field('top.old', curr)
 188             else:
 189                 self.__set_field('top.old', None)
 190         self.__set_field('top', string)
 191
 192     def restore_old_boundaries(self):
 193         bottom = self.__get_field('bottom.old')
 194         top = self.__get_field('top.old')
 195
 196         if top and bottom:
 197             self.__set_field('bottom', bottom)
 198             self.__set_field('top', top)
 199             return True
 200         else:
 201             return False
 202
 203     def get_description(self):
 204         return self.__get_field('description', True)
 205
 206     def set_description(self, string):
 207         self.__set_field('description', string, True)
 208
 209     def get_authname(self):
 210         return self.__get_field('authname')
 211
 212     def set_authname(self, string):
 213         if not string and config.has_option('stgit', 'authname'):
 214             string = config.get('stgit', 'authname')
 215         self.__set_field('authname', string)
 216
 217     def get_authemail(self):
 218         return self.__get_field('authemail')
 219
 220     def set_authemail(self, string):
 221         if not string and config.has_option('stgit', 'authemail'):
 222             string = config.get('stgit', 'authemail')
 223         self.__set_field('authemail', string)
 224
 225     def get_authdate(self):
 226         return self.__get_field('authdate')
 227
 228     def set_authdate(self, string):
 229         self.__set_field('authdate', string)
 230
 231     def get_commname(self):
 232         return self.__get_field('commname')
 233
 234     def set_commname(self, string):
 235         if not string and config.has_option('stgit', 'commname'):
 236             string = config.get('stgit', 'commname')
 237         self.__set_field('commname', string)
 238
 239     def get_commemail(self):
 240         return self.__get_field('commemail')
 241
 242     def set_commemail(self, string):
 243         if not string and config.has_option('stgit', 'commemail'):
 244             string = config.get('stgit', 'commemail')
 245         self.__set_field('commemail', string)
 246
 247
 248 class Series:
 249     """Class including the operations on series
 250     """
 251     def __init__(self, name = None):
 252         """Takes a series name as the parameter.
 253         """
 254         if name:
 255             self.__name = name
 256         else:
 257             self.__name = git.get_head_file()
 258
 259         if self.__name:
 260             self.__patch_dir = os.path.join(git.base_dir, 'patches',
 261                                             self.__name)
 262             self.__base_file = os.path.join(git.base_dir, 'refs', 'bases',
 263                                             self.__name)
 264             self.__applied_file = os.path.join(self.__patch_dir, 'applied')
 265             self.__unapplied_file = os.path.join(self.__patch_dir, 'unapplied')
 266             self.__current_file = os.path.join(self.__patch_dir, 'current')
 267
 268     def get_branch(self):
 269         """Return the branch name for the Series object
 270         """
 271         return self.__name
 272
 273     def __set_current(self, name):
 274         """Sets the topmost patch
 275         """
 276         if name:
 277             write_string(self.__current_file, name)
 278         else:
 279             create_empty_file(self.__current_file)
 280
 281     def get_patch(self, name):
 282         """Return a Patch object for the given name
 283         """
 284         return Patch(name, self.__patch_dir)
 285
 286     def get_current(self):
 287         """Return a Patch object representing the topmost patch
 288         """
 289         if os.path.isfile(self.__current_file):
 290             name = read_string(self.__current_file)
 291         else:
 292             return None
 293         if name == '':
 294             return None
 295         else:
 296             return name
 297
 298     def get_applied(self):
 299         if not os.path.isfile(self.__applied_file):
 300             raise StackException, \
 301                   'No StGIT metadata found. Try "stg init" first'
 302         f = file(self.__applied_file)
 303         names = [line.strip() for line in f.readlines()]
 304         f.close()
 305         return names
 306
 307     def get_unapplied(self):
 308         if not os.path.isfile(self.__unapplied_file):
 309             raise StackException, \
 310                   'No StGIT metadata found. Try "stg init" first'
 311         f = file(self.__unapplied_file)
 312         names = [line.strip() for line in f.readlines()]
 313         f.close()
 314         return names
 315
 316     def get_base_file(self):
 317         return self.__base_file
 318
 319     def __patch_is_current(self, patch):
 320         return patch.get_name() == read_string(self.__current_file)
 321
 322     def __patch_applied(self, name):
 323         """Return true if the patch exists in the applied list
 324         """
 325         return name in self.get_applied()
 326
 327     def __patch_unapplied(self, name):
 328         """Return true if the patch exists in the unapplied list
 329         """
 330         return name in self.get_unapplied()
 331
 332     def __begin_stack_check(self):
 333         """Save the current HEAD into .git/refs/heads/base if the stack
 334         is empty
 335         """
 336         if len(self.get_applied()) == 0:
 337             head = git.get_head()
 338             write_string(self.__base_file, head)
 339
 340     def __end_stack_check(self):
 341         """Remove .git/refs/heads/base if the stack is empty.
 342         This warning should never happen
 343         """
 344         if len(self.get_applied()) == 0 \
 345            and read_string(self.__base_file) != git.get_head():
 346             print 'Warning: stack empty but the HEAD and base are different'
 347
 348     def head_top_equal(self):
 349         """Return true if the head and the top are the same
 350         """
 351         crt = self.get_current()
 352         if not crt:
 353             # we don't care, no patches applied
 354             return True
 355         return git.get_head() == Patch(crt, self.__patch_dir).get_top()
 356
 357     def init(self):
 358         """Initialises the stgit series
 359         """
 360         bases_dir = os.path.join(git.base_dir, 'refs', 'bases')
 361
 362         if os.path.isdir(self.__patch_dir):
 363             raise StackException, self.__patch_dir + ' already exists'
 364         os.makedirs(self.__patch_dir)
 365
 366         if not os.path.isdir(bases_dir):
 367             os.makedirs(bases_dir)
 368
 369         create_empty_file(self.__applied_file)
 370         create_empty_file(self.__unapplied_file)
 371         self.__begin_stack_check()
 372
 373     def refresh_patch(self, message = None, edit = False, show_patch = False,
 374                       cache_update = True,
 375                       author_name = None, author_email = None,
 376                       author_date = None,
 377                       committer_name = None, committer_email = None,
 378                       commit_only = False):
 379         """Generates a new commit for the given patch
 380         """
 381         name = self.get_current()
 382         if not name:
 383             raise StackException, 'No patches applied'
 384
 385         patch = Patch(name, self.__patch_dir)
 386
 387         descr = patch.get_description()
 388         if not (message or descr):
 389             edit = True
 390             descr = ''
 391         elif message:
 392             descr = message
 393
 394         if not message and edit:
 395             descr = edit_file(self, descr.rstrip(), \
 396                               'Please edit the description for patch "%s" ' \
 397                               'above.' % name, show_patch)
 398
 399         if not author_name:
 400             author_name = patch.get_authname()
 401         if not author_email:
 402             author_email = patch.get_authemail()
 403         if not author_date:
 404             author_date = patch.get_authdate()
 405         if not committer_name:
 406             committer_name = patch.get_commname()
 407         if not committer_email:
 408             committer_email = patch.get_commemail()
 409
 410         commit_id = git.commit(message = descr, parents = [patch.get_bottom()],
 411                                cache_update = cache_update,
 412                                allowempty = True,
 413                                author_name = author_name,
 414                                author_email = author_email,
 415                                author_date = author_date,
 416                                committer_name = committer_name,
 417                                committer_email = committer_email)
 418
 419         if not commit_only:
 420             patch.set_top(commit_id)
 421             patch.set_description(descr)
 422             patch.set_authname(author_name)
 423             patch.set_authemail(author_email)
 424             patch.set_authdate(author_date)
 425             patch.set_commname(committer_name)
 426             patch.set_commemail(committer_email)
 427
 428         return commit_id
 429
 430     def new_patch(self, name, message = None, can_edit = True,
 431                   unapplied = False, show_patch = False,
 432                   top = None, bottom = None,
 433                   author_name = None, author_email = None, author_date = None,
 434                   committer_name = None, committer_email = None):
 435         """Creates a new patch
 436         """
 437         if self.__patch_applied(name) or self.__patch_unapplied(name):
 438             raise StackException, 'Patch "%s" already exists' % name
 439
 440         if not message and can_edit:
 441             descr = edit_file(self, None, \
 442                               'Please enter the description for patch "%s" ' \
 443                               'above.' % name, show_patch)
 444         else:
 445             descr = message
 446
 447         head = git.get_head()
 448
 449         self.__begin_stack_check()
 450
 451         patch = Patch(name, self.__patch_dir)
 452         patch.create()
 453
 454         if bottom:
 455             patch.set_bottom(bottom)
 456         else:
 457             patch.set_bottom(head)
 458         if top:
 459             patch.set_top(top)
 460         else:
 461             patch.set_top(head)
 462
 463         patch.set_description(descr)
 464         patch.set_authname(author_name)
 465         patch.set_authemail(author_email)
 466         patch.set_authdate(author_date)
 467         patch.set_commname(committer_name)
 468         patch.set_commemail(committer_email)
 469
 470         if unapplied:
 471             patches = [patch.get_name()] + self.get_unapplied()
 472
 473             f = file(self.__unapplied_file, 'w+')
 474             f.writelines([line + '\n' for line in patches])
 475             f.close()
 476         else:
 477             append_string(self.__applied_file, patch.get_name())
 478             self.__set_current(name)
 479
 480     def delete_patch(self, name):
 481         """Deletes a patch
 482         """
 483         patch = Patch(name, self.__patch_dir)
 484
 485         if self.__patch_is_current(patch):
 486             self.pop_patch(name)
 487         elif self.__patch_applied(name):
 488             raise StackException, 'Cannot remove an applied patch, "%s", ' \
 489                   'which is not current' % name
 490         elif not name in self.get_unapplied():
 491             raise StackException, 'Unknown patch "%s"' % name
 492
 493         patch.delete()
 494
 495         unapplied = self.get_unapplied()
 496         unapplied.remove(name)
 497         f = file(self.__unapplied_file, 'w+')
 498         f.writelines([line + '\n' for line in unapplied])
 499         f.close()
 500
 501     def forward_patches(self, names):
 502         """Try to fast-forward an array of patches.
 503
 504         On return, patches in names[0:returned_value] have been pushed on the
 505         stack. Apply the rest with push_patch
 506         """
 507         unapplied = self.get_unapplied()
 508         self.__begin_stack_check()
 509
 510         forwarded = 0
 511         top = git.get_head()
 512
 513         for name in names:
 514             assert(name in unapplied)
 515
 516             patch = Patch(name, self.__patch_dir)
 517
 518             head = top
 519             bottom = patch.get_bottom()
 520             top = patch.get_top()
 521
 522             # top != bottom always since we have a commit for each patch
 523             if head == bottom:
 524                 # reset the backup information
 525                 patch.set_bottom(head, backup = True)
 526                 patch.set_top(top, backup = True)
 527
 528             else:
 529                 head_tree = git.get_commit(head).get_tree()
 530                 bottom_tree = git.get_commit(bottom).get_tree()
 531                 if head_tree == bottom_tree:
 532                     # We must just reparent this patch and create a new commit
 533                     # for it
 534                     descr = patch.get_description()
 535                     author_name = patch.get_authname()
 536                     author_email = patch.get_authemail()
 537                     author_date = patch.get_authdate()
 538                     committer_name = patch.get_commname()
 539                     committer_email = patch.get_commemail()
 540
 541                     top_tree = git.get_commit(top).get_tree()
 542
 543                     top = git.commit(message = descr, parents = [head],
 544                                      cache_update = False,
 545                                      tree_id = top_tree,
 546                                      allowempty = True,
 547                                      author_name = author_name,
 548                                      author_email = author_email,
 549                                      author_date = author_date,
 550                                      committer_name = committer_name,
 551                                      committer_email = committer_email)
 552
 553                     patch.set_bottom(head, backup = True)
 554                     patch.set_top(top, backup = True)
 555                 else:
 556                     top = head
 557                     # stop the fast-forwarding, must do a real merge
 558                     break
 559
 560             forwarded+=1
 561             unapplied.remove(name)
 562
 563         git.switch(top)
 564
 565         append_strings(self.__applied_file, names[0:forwarded])
 566
 567         f = file(self.__unapplied_file, 'w+')
 568         f.writelines([line + '\n' for line in unapplied])
 569         f.close()
 570
 571         self.__set_current(name)
 572
 573         return forwarded
 574
 575     def push_patch(self, name):
 576         """Pushes a patch on the stack
 577         """
 578         unapplied = self.get_unapplied()
 579         assert(name in unapplied)
 580
 581         self.__begin_stack_check()
 582
 583         patch = Patch(name, self.__patch_dir)
 584
 585         head = git.get_head()
 586         bottom = patch.get_bottom()
 587         top = patch.get_top()
 588
 589         ex = None
 590
 591         # top != bottom always since we have a commit for each patch
 592         if head == bottom:
 593             # reset the backup information
 594             patch.set_bottom(bottom, backup = True)
 595             patch.set_top(top, backup = True)
 596
 597             git.switch(top)
 598         else:
 599             # new patch needs to be refreshed.
 600             # The current patch is empty after merge.
 601             patch.set_bottom(head, backup = True)
 602             patch.set_top(head, backup = True)
 603             # merge/refresh can fail but the patch needs to be pushed
 604             try:
 605                 git.merge(bottom, head, top)
 606             except git.GitException, ex:
 607                 print >> sys.stderr, \
 608                       'The merge failed during "push". ' \
 609                       'Use "refresh" after fixing the conflicts'
 610                 pass
 611
 612         append_string(self.__applied_file, name)
 613
 614         unapplied.remove(name)
 615         f = file(self.__unapplied_file, 'w+')
 616         f.writelines([line + '\n' for line in unapplied])
 617         f.close()
 618
 619         self.__set_current(name)
 620
 621         # head == bottom case doesn't need to refresh the patch
 622         if head != bottom:
 623             if not ex:
 624                 # if the merge was OK and no conflicts, just refresh the patch
 625                 # The GIT cache was already updated by the merge operation
 626                 self.refresh_patch(cache_update = False)
 627             else:
 628                 raise StackException, str(ex)
 629
 630     def undo_push(self):
 631         name = self.get_current()
 632         assert(name)
 633
 634         patch = Patch(name, self.__patch_dir)
 635         git.reset()
 636         self.pop_patch(name)
 637         return patch.restore_old_boundaries()
 638
 639     def pop_patch(self, name):
 640         """Pops the top patch from the stack
 641         """
 642         applied = self.get_applied()
 643         applied.reverse()
 644         assert(name in applied)
 645
 646         patch = Patch(name, self.__patch_dir)
 647
 648         git.switch(patch.get_bottom())
 649
 650         # save the new applied list
 651         idx = applied.index(name) + 1
 652
 653         popped = applied[:idx]
 654         popped.reverse()
 655         unapplied = popped + self.get_unapplied()
 656
 657         f = file(self.__unapplied_file, 'w+')
 658         f.writelines([line + '\n' for line in unapplied])
 659         f.close()
 660
 661         del applied[:idx]
 662         applied.reverse()
 663
 664         f = file(self.__applied_file, 'w+')
 665         f.writelines([line + '\n' for line in applied])
 666         f.close()
 667
 668         if applied == []:
 669             self.__set_current(None)
 670         else:
 671             self.__set_current(applied[-1])
 672
 673         self.__end_stack_check()
 674
 675     def empty_patch(self, name):
 676         """Returns True if the patch is empty
 677         """
 678         patch = Patch(name, self.__patch_dir)
 679         bottom = patch.get_bottom()
 680         top = patch.get_top()
 681
 682         if bottom == top:
 683             return True
 684         elif git.get_commit(top).get_tree() \
 685                  == git.get_commit(bottom).get_tree():
 686             return True
 687
 688         return False
 689
 690     def rename_patch(self, oldname, newname):
 691         applied = self.get_applied()
 692         unapplied = self.get_unapplied()
 693
 694         if newname in applied or newname in unapplied:
 695             raise StackException, 'Patch "%s" already exists' % newname
 696
 697         if oldname in unapplied:
 698             Patch(oldname, self.__patch_dir).rename(newname)
 699             unapplied[unapplied.index(oldname)] = newname
 700
 701             f = file(self.__unapplied_file, 'w+')
 702             f.writelines([line + '\n' for line in unapplied])
 703             f.close()
 704         elif oldname in applied:
 705             Patch(oldname, self.__patch_dir).rename(newname)
 706             if oldname == self.get_current():
 707                 self.__set_current(newname)
 708
 709             applied[applied.index(oldname)] = newname
 710
 711             f = file(self.__applied_file, 'w+')
 712             f.writelines([line + '\n' for line in applied])
 713             f.close()
 714         else:
 715             raise StackException, 'Unknown patch "%s"' % oldname