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             self.__set_field('bottom.old', self.__get_field('bottom'))
 174         self.__set_field('bottom', string)
 175
 176     def get_top(self):
 177         return self.__get_field('top')
 178
 179     def set_top(self, string, backup = False):
 180         if backup:
 181             self.__set_field('top.old', self.__get_field('top'))
 182         self.__set_field('top', string)
 183
 184     def restore_old_boundaries(self):
 185         bottom = self.__get_field('bottom.old')
 186         top = self.__get_field('top.old')
 187
 188         if top and bottom:
 189             self.__set_field('bottom', bottom)
 190             self.__set_field('top', top)
 191         else:
 192             raise StackException, 'No patch undo information'
 193
 194     def get_description(self):
 195         return self.__get_field('description', True)
 196
 197     def set_description(self, string):
 198         self.__set_field('description', string, True)
 199
 200     def get_authname(self):
 201         return self.__get_field('authname')
 202
 203     def set_authname(self, string):
 204         if not string and config.has_option('stgit', 'authname'):
 205             string = config.get('stgit', 'authname')
 206         self.__set_field('authname', string)
 207
 208     def get_authemail(self):
 209         return self.__get_field('authemail')
 210
 211     def set_authemail(self, string):
 212         if not string and config.has_option('stgit', 'authemail'):
 213             string = config.get('stgit', 'authemail')
 214         self.__set_field('authemail', string)
 215
 216     def get_authdate(self):
 217         return self.__get_field('authdate')
 218
 219     def set_authdate(self, string):
 220         self.__set_field('authdate', string)
 221
 222     def get_commname(self):
 223         return self.__get_field('commname')
 224
 225     def set_commname(self, string):
 226         if not string and config.has_option('stgit', 'commname'):
 227             string = config.get('stgit', 'commname')
 228         self.__set_field('commname', string)
 229
 230     def get_commemail(self):
 231         return self.__get_field('commemail')
 232
 233     def set_commemail(self, string):
 234         if not string and config.has_option('stgit', 'commemail'):
 235             string = config.get('stgit', 'commemail')
 236         self.__set_field('commemail', string)
 237
 238
 239 class Series:
 240     """Class including the operations on series
 241     """
 242     def __init__(self, name = None):
 243         """Takes a series name as the parameter. A valid .git/patches/name
 244         directory should exist
 245         """
 246         if name:
 247             self.__name = name
 248         else:
 249             self.__name = git.get_head_file()
 250
 251         if self.__name:
 252             self.__patch_dir = os.path.join(git.base_dir, 'patches',
 253                                             self.__name)
 254             self.__base_file = os.path.join(git.base_dir, 'refs', 'bases',
 255                                             self.__name)
 256             self.__applied_file = os.path.join(self.__patch_dir, 'applied')
 257             self.__unapplied_file = os.path.join(self.__patch_dir, 'unapplied')
 258             self.__current_file = os.path.join(self.__patch_dir, 'current')
 259
 260     def get_branch(self):
 261         """Return the branch name for the Series object
 262         """
 263         return self.__name
 264
 265     def __set_current(self, name):
 266         """Sets the topmost patch
 267         """
 268         if name:
 269             write_string(self.__current_file, name)
 270         else:
 271             create_empty_file(self.__current_file)
 272
 273     def get_patch(self, name):
 274         """Return a Patch object for the given name
 275         """
 276         return Patch(name, self.__patch_dir)
 277
 278     def get_current(self):
 279         """Return a Patch object representing the topmost patch
 280         """
 281         if os.path.isfile(self.__current_file):
 282             name = read_string(self.__current_file)
 283         else:
 284             return None
 285         if name == '':
 286             return None
 287         else:
 288             return name
 289
 290     def get_applied(self):
 291         f = file(self.__applied_file)
 292         names = [line.strip() for line in f.readlines()]
 293         f.close()
 294         return names
 295
 296     def get_unapplied(self):
 297         f = file(self.__unapplied_file)
 298         names = [line.strip() for line in f.readlines()]
 299         f.close()
 300         return names
 301
 302     def get_base_file(self):
 303         return self.__base_file
 304
 305     def __patch_is_current(self, patch):
 306         return patch.get_name() == read_string(self.__current_file)
 307
 308     def __patch_applied(self, name):
 309         """Return true if the patch exists in the applied list
 310         """
 311         return name in self.get_applied()
 312
 313     def __patch_unapplied(self, name):
 314         """Return true if the patch exists in the unapplied list
 315         """
 316         return name in self.get_unapplied()
 317
 318     def __begin_stack_check(self):
 319         """Save the current HEAD into .git/refs/heads/base if the stack
 320         is empty
 321         """
 322         if len(self.get_applied()) == 0:
 323             head = git.get_head()
 324             write_string(self.__base_file, head)
 325
 326     def __end_stack_check(self):
 327         """Remove .git/refs/heads/base if the stack is empty.
 328         This warning should never happen
 329         """
 330         if len(self.get_applied()) == 0 \
 331            and read_string(self.__base_file) != git.get_head():
 332             print 'Warning: stack empty but the HEAD and base are different'
 333
 334     def head_top_equal(self):
 335         """Return true if the head and the top are the same
 336         """
 337         crt = self.get_current()
 338         if not crt:
 339             # we don't care, no patches applied
 340             return True
 341         return git.get_head() == Patch(crt, self.__patch_dir).get_top()
 342
 343     def init(self):
 344         """Initialises the stgit series
 345         """
 346         bases_dir = os.path.join(git.base_dir, 'refs', 'bases')
 347
 348         if os.path.isdir(self.__patch_dir):
 349             raise StackException, self.__patch_dir + ' already exists'
 350         os.makedirs(self.__patch_dir)
 351
 352         if not os.path.isdir(bases_dir):
 353             os.makedirs(bases_dir)
 354
 355         create_empty_file(self.__applied_file)
 356         create_empty_file(self.__unapplied_file)
 357         self.__begin_stack_check()
 358
 359     def refresh_patch(self, message = None, edit = False, show_patch = False,
 360                       cache_update = True,
 361                       author_name = None, author_email = None,
 362                       author_date = None,
 363                       committer_name = None, committer_email = None,
 364                       commit_only = False):
 365         """Generates a new commit for the given patch
 366         """
 367         name = self.get_current()
 368         if not name:
 369             raise StackException, 'No patches applied'
 370
 371         patch = Patch(name, self.__patch_dir)
 372
 373         descr = patch.get_description()
 374         if not (message or descr):
 375             edit = True
 376             descr = ''
 377         elif message:
 378             descr = message
 379
 380         if not message and edit:
 381             descr = edit_file(self, descr.rstrip(), \
 382                               'Please edit the description for patch "%s" ' \
 383                               'above.' % name, show_patch)
 384
 385         if not author_name:
 386             author_name = patch.get_authname()
 387         if not author_email:
 388             author_email = patch.get_authemail()
 389         if not author_date:
 390             author_date = patch.get_authdate()
 391         if not committer_name:
 392             committer_name = patch.get_commname()
 393         if not committer_email:
 394             committer_email = patch.get_commemail()
 395
 396         commit_id = git.commit(message = descr, parents = [patch.get_bottom()],
 397                                cache_update = cache_update,
 398                                allowempty = True,
 399                                author_name = author_name,
 400                                author_email = author_email,
 401                                author_date = author_date,
 402                                committer_name = committer_name,
 403                                committer_email = committer_email)
 404
 405         if not commit_only:
 406             patch.set_top(commit_id)
 407             patch.set_description(descr)
 408             patch.set_authname(author_name)
 409             patch.set_authemail(author_email)
 410             patch.set_authdate(author_date)
 411             patch.set_commname(committer_name)
 412             patch.set_commemail(committer_email)
 413
 414         return commit_id
 415
 416     def new_patch(self, name, message = None, can_edit = True, show_patch = False,
 417                   author_name = None, author_email = None, author_date = None,
 418                   committer_name = None, committer_email = None):
 419         """Creates a new patch
 420         """
 421         if self.__patch_applied(name) or self.__patch_unapplied(name):
 422             raise StackException, 'Patch "%s" already exists' % name
 423
 424         if not message and can_edit:
 425             descr = edit_file(self, None, \
 426                               'Please enter the description for patch "%s" ' \
 427                               'above.' % name, show_patch)
 428         else:
 429             descr = message
 430
 431         head = git.get_head()
 432
 433         self.__begin_stack_check()
 434
 435         patch = Patch(name, self.__patch_dir)
 436         patch.create()
 437         patch.set_bottom(head)
 438         patch.set_top(head)
 439         patch.set_description(descr)
 440         patch.set_authname(author_name)
 441         patch.set_authemail(author_email)
 442         patch.set_authdate(author_date)
 443         patch.set_commname(committer_name)
 444         patch.set_commemail(committer_email)
 445
 446         append_string(self.__applied_file, patch.get_name())
 447         self.__set_current(name)
 448
 449     def delete_patch(self, name):
 450         """Deletes a patch
 451         """
 452         patch = Patch(name, self.__patch_dir)
 453
 454         if self.__patch_is_current(patch):
 455             self.pop_patch(name)
 456         elif self.__patch_applied(name):
 457             raise StackException, 'Cannot remove an applied patch, "%s", ' \
 458                   'which is not current' % name
 459         elif not name in self.get_unapplied():
 460             raise StackException, 'Unknown patch "%s"' % name
 461
 462         patch.delete()
 463
 464         unapplied = self.get_unapplied()
 465         unapplied.remove(name)
 466         f = file(self.__unapplied_file, 'w+')
 467         f.writelines([line + '\n' for line in unapplied])
 468         f.close()
 469
 470     def forward_patches(self, names):
 471         """Try to fast-forward an array of patches.
 472
 473         On return, patches in names[0:returned_value] have been pushed on the
 474         stack. Apply the rest with push_patch
 475         """
 476         unapplied = self.get_unapplied()
 477         self.__begin_stack_check()
 478
 479         forwarded = 0
 480         top = git.get_head()
 481
 482         for name in names:
 483             assert(name in unapplied)
 484
 485             patch = Patch(name, self.__patch_dir)
 486
 487             head = top
 488             bottom = patch.get_bottom()
 489             top = patch.get_top()
 490
 491             # top != bottom always since we have a commit for each patch
 492             if head == bottom:
 493                 # reset the backup information
 494                 patch.set_bottom(bottom, backup = True)
 495                 patch.set_top(top, backup = True)
 496
 497             else:
 498                 top = head
 499                 # stop the fast-forwarding, must do a real merge
 500                 break
 501
 502             forwarded+=1
 503             unapplied.remove(name)
 504
 505         git.switch(top)
 506
 507         append_strings(self.__applied_file, names[0:forwarded])
 508
 509         f = file(self.__unapplied_file, 'w+')
 510         f.writelines([line + '\n' for line in unapplied])
 511         f.close()
 512
 513         self.__set_current(name)
 514
 515         return forwarded
 516
 517     def push_patch(self, name):
 518         """Pushes a patch on the stack
 519         """
 520         unapplied = self.get_unapplied()
 521         assert(name in unapplied)
 522
 523         self.__begin_stack_check()
 524
 525         patch = Patch(name, self.__patch_dir)
 526
 527         head = git.get_head()
 528         bottom = patch.get_bottom()
 529         top = patch.get_top()
 530
 531         ex = None
 532
 533         # top != bottom always since we have a commit for each patch
 534         if head == bottom:
 535             # reset the backup information
 536             patch.set_bottom(bottom, backup = True)
 537             patch.set_top(top, backup = True)
 538
 539             git.switch(top)
 540         else:
 541             # new patch needs to be refreshed.
 542             # The current patch is empty after merge.
 543             patch.set_bottom(head, backup = True)
 544             patch.set_top(head, backup = True)
 545             # merge/refresh can fail but the patch needs to be pushed
 546             try:
 547                 git.merge(bottom, head, top)
 548             except git.GitException, ex:
 549                 print >> sys.stderr, \
 550                       'The merge failed during "push". ' \
 551                       'Use "refresh" after fixing the conflicts'
 552                 pass
 553
 554         append_string(self.__applied_file, name)
 555
 556         unapplied.remove(name)
 557         f = file(self.__unapplied_file, 'w+')
 558         f.writelines([line + '\n' for line in unapplied])
 559         f.close()
 560
 561         self.__set_current(name)
 562
 563         # head == bottom case doesn't need to refresh the patch
 564         if head != bottom:
 565             if not ex:
 566                 # if the merge was OK and no conflicts, just refresh the patch
 567                 # The GIT cache was already updated by the merge operation
 568                 self.refresh_patch(cache_update = False)
 569             else:
 570                 raise StackException, str(ex)
 571
 572     def undo_push(self):
 573         name = self.get_current()
 574         assert(name)
 575
 576         patch = Patch(name, self.__patch_dir)
 577         git.reset()
 578         self.pop_patch(name)
 579         patch.restore_old_boundaries()
 580
 581     def pop_patch(self, name):
 582         """Pops the top patch from the stack
 583         """
 584         applied = self.get_applied()
 585         applied.reverse()
 586         assert(name in applied)
 587
 588         patch = Patch(name, self.__patch_dir)
 589
 590         git.switch(patch.get_bottom())
 591
 592         # save the new applied list
 593         idx = applied.index(name) + 1
 594
 595         popped = applied[:idx]
 596         popped.reverse()
 597         unapplied = popped + self.get_unapplied()
 598
 599         f = file(self.__unapplied_file, 'w+')
 600         f.writelines([line + '\n' for line in unapplied])
 601         f.close()
 602
 603         del applied[:idx]
 604         applied.reverse()
 605
 606         f = file(self.__applied_file, 'w+')
 607         f.writelines([line + '\n' for line in applied])
 608         f.close()
 609
 610         if applied == []:
 611             self.__set_current(None)
 612         else:
 613             self.__set_current(applied[-1])
 614
 615         self.__end_stack_check()
 616
 617     def empty_patch(self, name):
 618         """Returns True if the patch is empty
 619         """
 620         patch = Patch(name, self.__patch_dir)
 621         bottom = patch.get_bottom()
 622         top = patch.get_top()
 623
 624         if bottom == top:
 625             return True
 626         elif git.get_commit(top).get_tree() \
 627                  == git.get_commit(bottom).get_tree():
 628             return True
 629
 630         return False
 631
 632     def rename_patch(self, oldname, newname):
 633         applied = self.get_applied()
 634         unapplied = self.get_unapplied()
 635
 636         if newname in applied or newname in unapplied:
 637             raise StackException, 'Patch "%s" already exists' % newname
 638
 639         if oldname in unapplied:
 640             Patch(oldname, self.__patch_dir).rename(newname)
 641             unapplied[unapplied.index(oldname)] = newname
 642
 643             f = file(self.__unapplied_file, 'w+')
 644             f.writelines([line + '\n' for line in unapplied])
 645             f.close()
 646         elif oldname in applied:
 647             Patch(oldname, self.__patch_dir).rename(newname)
 648             if oldname == self.get_current():
 649                 self.__set_current(newname)
 650
 651             applied[applied.index(oldname)] = newname
 652
 653             f = file(self.__applied_file, 'w+')
 654             f.writelines([line + '\n' for line in applied])
 655             f.close()
 656         else:
 657             raise StackException, 'Unknown patch "%s"' % oldname