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 #
  33 # Functions
  34 #
  35 __comment_prefix = 'STG:'
  36
  37 def __clean_comments(f):
  38     """Removes lines marked for status in a commit file
  39     """
  40     f.seek(0)
  41
  42     # remove status-prefixed lines
  43     lines = filter(lambda x: x[0:len(__comment_prefix)] != __comment_prefix,
  44                    f.readlines())
  45     # remove empty lines at the end
  46     while len(lines) != 0 and lines[-1] == '\n':
  47         del lines[-1]
  48
  49     f.seek(0); f.truncate()
  50     f.writelines(lines)
  51
  52 def edit_file(string, comment):
  53     fname = '.stgit.msg'
  54     tmpl = os.path.join(git.base_dir, 'patchdescr.tmpl')
  55
  56     f = file(fname, 'w+')
  57     if string:
  58         print >> f, string
  59     elif os.path.isfile(tmpl):
  60         print >> f, file(tmpl).read().rstrip()
  61     else:
  62         print >> f
  63     print >> f, __comment_prefix, comment
  64     print >> f, __comment_prefix, \
  65           'Lines prefixed with "%s" will be automatically removed.' \
  66           % __comment_prefix
  67     print >> f, __comment_prefix, \
  68           'Trailing empty lines will be automatically removed.'
  69     f.close()
  70
  71     # the editor
  72     if 'EDITOR' in os.environ:
  73         editor = os.environ['EDITOR']
  74     else:
  75         editor = 'vi'
  76     editor += ' %s' % fname
  77
  78     print 'Invoking the editor: "%s"...' % editor,
  79     sys.stdout.flush()
  80     print 'done (exit code: %d)' % os.system(editor)
  81
  82     f = file(fname, 'r+')
  83
  84     __clean_comments(f)
  85     f.seek(0)
  86     string = f.read()
  87
  88     f.close()
  89     os.remove(fname)
  90
  91     return string
  92
  93 #
  94 # Classes
  95 #
  96
  97 class Patch:
  98     """Basic patch implementation
  99     """
 100     def __init__(self, name, patch_dir):
 101         self.__patch_dir = patch_dir
 102         self.__name = name
 103         self.__dir = os.path.join(self.__patch_dir, self.__name)
 104
 105     def create(self):
 106         os.mkdir(self.__dir)
 107         create_empty_file(os.path.join(self.__dir, 'bottom'))
 108         create_empty_file(os.path.join(self.__dir, 'top'))
 109
 110     def delete(self):
 111         for f in os.listdir(self.__dir):
 112             os.remove(os.path.join(self.__dir, f))
 113         os.rmdir(self.__dir)
 114
 115     def get_name(self):
 116         return self.__name
 117
 118     def rename(self, newname):
 119         olddir = self.__dir
 120         self.__name = newname
 121         self.__dir = os.path.join(self.__patch_dir, self.__name)
 122
 123         os.rename(olddir, self.__dir)
 124
 125     def __get_field(self, name, multiline = False):
 126         id_file = os.path.join(self.__dir, name)
 127         if os.path.isfile(id_file):
 128             string = read_string(id_file, multiline)
 129             if string == '':
 130                 return None
 131             else:
 132                 return string
 133         else:
 134             return None
 135
 136     def __set_field(self, name, string, multiline = False):
 137         fname = os.path.join(self.__dir, name)
 138         if string and string != '':
 139             write_string(fname, string, multiline)
 140         elif os.path.isfile(fname):
 141             os.remove(fname)
 142
 143     def get_bottom(self):
 144         return self.__get_field('bottom')
 145
 146     def set_bottom(self, string, backup = False):
 147         if backup:
 148             self.__set_field('bottom.old', self.__get_field('bottom'))
 149         self.__set_field('bottom', string)
 150
 151     def get_top(self):
 152         return self.__get_field('top')
 153
 154     def set_top(self, string, backup = False):
 155         if backup:
 156             self.__set_field('top.old', self.__get_field('top'))
 157         self.__set_field('top', string)
 158
 159     def restore_old_boundaries(self):
 160         bottom = self.__get_field('bottom.old')
 161         top = self.__get_field('top.old')
 162
 163         if top and bottom:
 164             self.__set_field('bottom', bottom)
 165             self.__set_field('top', top)
 166         else:
 167             raise StackException, 'No patch undo information'
 168
 169     def get_description(self):
 170         return self.__get_field('description', True)
 171
 172     def set_description(self, string):
 173         self.__set_field('description', string, True)
 174
 175     def get_authname(self):
 176         return self.__get_field('authname')
 177
 178     def set_authname(self, string):
 179         if not string and config.has_option('stgit', 'authname'):
 180             string = config.get('stgit', 'authname')
 181         self.__set_field('authname', string)
 182
 183     def get_authemail(self):
 184         return self.__get_field('authemail')
 185
 186     def set_authemail(self, string):
 187         if not string and config.has_option('stgit', 'authemail'):
 188             string = config.get('stgit', 'authemail')
 189         self.__set_field('authemail', string)
 190
 191     def get_authdate(self):
 192         return self.__get_field('authdate')
 193
 194     def set_authdate(self, string):
 195         self.__set_field('authdate', string)
 196
 197     def get_commname(self):
 198         return self.__get_field('commname')
 199
 200     def set_commname(self, string):
 201         if not string and config.has_option('stgit', 'commname'):
 202             string = config.get('stgit', 'commname')
 203         self.__set_field('commname', string)
 204
 205     def get_commemail(self):
 206         return self.__get_field('commemail')
 207
 208     def set_commemail(self, string):
 209         if not string and config.has_option('stgit', 'commemail'):
 210             string = config.get('stgit', 'commemail')
 211         self.__set_field('commemail', string)
 212
 213
 214 class Series:
 215     """Class including the operations on series
 216     """
 217     def __init__(self, name = None):
 218         """Takes a series name as the parameter. A valid .git/patches/name
 219         directory should exist
 220         """
 221         if name:
 222             self.__name = name
 223         else:
 224             self.__name = git.get_head_file()
 225
 226         if self.__name:
 227             self.__patch_dir = os.path.join(git.base_dir, 'patches',
 228                                             self.__name)
 229             self.__base_file = os.path.join(git.base_dir, 'refs', 'bases',
 230                                             self.__name)
 231             self.__applied_file = os.path.join(self.__patch_dir, 'applied')
 232             self.__unapplied_file = os.path.join(self.__patch_dir, 'unapplied')
 233             self.__current_file = os.path.join(self.__patch_dir, 'current')
 234
 235     def __set_current(self, name):
 236         """Sets the topmost patch
 237         """
 238         if name:
 239             write_string(self.__current_file, name)
 240         else:
 241             create_empty_file(self.__current_file)
 242
 243     def get_patch(self, name):
 244         """Return a Patch object for the given name
 245         """
 246         return Patch(name, self.__patch_dir)
 247
 248     def get_current(self):
 249         """Return a Patch object representing the topmost patch
 250         """
 251         if os.path.isfile(self.__current_file):
 252             name = read_string(self.__current_file)
 253         else:
 254             return None
 255         if name == '':
 256             return None
 257         else:
 258             return name
 259
 260     def get_applied(self):
 261         f = file(self.__applied_file)
 262         names = [line.strip() for line in f.readlines()]
 263         f.close()
 264         return names
 265
 266     def get_unapplied(self):
 267         f = file(self.__unapplied_file)
 268         names = [line.strip() for line in f.readlines()]
 269         f.close()
 270         return names
 271
 272     def get_base_file(self):
 273         return self.__base_file
 274
 275     def __patch_is_current(self, patch):
 276         return patch.get_name() == read_string(self.__current_file)
 277
 278     def __patch_applied(self, name):
 279         """Return true if the patch exists in the applied list
 280         """
 281         return name in self.get_applied()
 282
 283     def __patch_unapplied(self, name):
 284         """Return true if the patch exists in the unapplied list
 285         """
 286         return name in self.get_unapplied()
 287
 288     def __begin_stack_check(self):
 289         """Save the current HEAD into .git/refs/heads/base if the stack
 290         is empty
 291         """
 292         if len(self.get_applied()) == 0:
 293             head = git.get_head()
 294             write_string(self.__base_file, head)
 295
 296     def __end_stack_check(self):
 297         """Remove .git/refs/heads/base if the stack is empty.
 298         This warning should never happen
 299         """
 300         if len(self.get_applied()) == 0 \
 301            and read_string(self.__base_file) != git.get_head():
 302             print 'Warning: stack empty but the HEAD and base are different'
 303
 304     def head_top_equal(self):
 305         """Return true if the head and the top are the same
 306         """
 307         crt = self.get_current()
 308         if not crt:
 309             # we don't care, no patches applied
 310             return True
 311         return git.get_head() == Patch(crt, self.__patch_dir).get_top()
 312
 313     def init(self):
 314         """Initialises the stgit series
 315         """
 316         bases_dir = os.path.join(git.base_dir, 'refs', 'bases')
 317
 318         if os.path.isdir(self.__patch_dir):
 319             raise StackException, self.__patch_dir + ' already exists'
 320         os.makedirs(self.__patch_dir)
 321
 322         if not os.path.isdir(bases_dir):
 323             os.makedirs(bases_dir)
 324
 325         create_empty_file(self.__applied_file)
 326         create_empty_file(self.__unapplied_file)
 327         self.__begin_stack_check()
 328
 329     def refresh_patch(self, message = None, edit = False, cache_update = True,
 330                       author_name = None, author_email = None,
 331                       author_date = None,
 332                       committer_name = None, committer_email = None,
 333                       commit_only = False):
 334         """Generates a new commit for the given patch
 335         """
 336         name = self.get_current()
 337         if not name:
 338             raise StackException, 'No patches applied'
 339
 340         patch = Patch(name, self.__patch_dir)
 341
 342         descr = patch.get_description()
 343         if not (message or descr):
 344             edit = True
 345             descr = ''
 346         elif message:
 347             descr = message
 348
 349         if not message and edit:
 350             descr = edit_file(descr.rstrip(), \
 351                               'Please edit the description for patch "%s" ' \
 352                               'above.' % name)
 353
 354         if not author_name:
 355             author_name = patch.get_authname()
 356         if not author_email:
 357             author_email = patch.get_authemail()
 358         if not author_date:
 359             author_date = patch.get_authdate()
 360         if not committer_name:
 361             committer_name = patch.get_commname()
 362         if not committer_email:
 363             committer_email = patch.get_commemail()
 364
 365         commit_id = git.commit(message = descr, parents = [patch.get_bottom()],
 366                                cache_update = cache_update,
 367                                allowempty = True,
 368                                author_name = author_name,
 369                                author_email = author_email,
 370                                author_date = author_date,
 371                                committer_name = committer_name,
 372                                committer_email = committer_email)
 373
 374         if not commit_only:
 375             patch.set_top(commit_id)
 376             patch.set_description(descr)
 377             patch.set_authname(author_name)
 378             patch.set_authemail(author_email)
 379             patch.set_authdate(author_date)
 380             patch.set_commname(committer_name)
 381             patch.set_commemail(committer_email)
 382
 383         return commit_id
 384
 385     def new_patch(self, name, message = None, edit = False,
 386                   author_name = None, author_email = None, author_date = None,
 387                   committer_name = None, committer_email = None):
 388         """Creates a new patch
 389         """
 390         if self.__patch_applied(name) or self.__patch_unapplied(name):
 391             raise StackException, 'Patch "%s" already exists' % name
 392
 393         if not message:
 394             descr = edit_file(None, \
 395                               'Please enter the description for patch "%s" ' \
 396                               'above.' % name)
 397         else:
 398             descr = message
 399
 400         head = git.get_head()
 401
 402         self.__begin_stack_check()
 403
 404         patch = Patch(name, self.__patch_dir)
 405         patch.create()
 406         patch.set_bottom(head)
 407         patch.set_top(head)
 408         patch.set_description(descr)
 409         patch.set_authname(author_name)
 410         patch.set_authemail(author_email)
 411         patch.set_authdate(author_date)
 412         patch.set_commname(committer_name)
 413         patch.set_commemail(committer_email)
 414
 415         append_string(self.__applied_file, patch.get_name())
 416         self.__set_current(name)
 417
 418     def delete_patch(self, name):
 419         """Deletes a patch
 420         """
 421         patch = Patch(name, self.__patch_dir)
 422
 423         if self.__patch_is_current(patch):
 424             self.pop_patch(name)
 425         elif self.__patch_applied(name):
 426             raise StackException, 'Cannot remove an applied patch, "%s", ' \
 427                   'which is not current' % name
 428         elif not name in self.get_unapplied():
 429             raise StackException, 'Unknown patch "%s"' % name
 430
 431         patch.delete()
 432
 433         unapplied = self.get_unapplied()
 434         unapplied.remove(name)
 435         f = file(self.__unapplied_file, 'w+')
 436         f.writelines([line + '\n' for line in unapplied])
 437         f.close()
 438
 439     def push_patch(self, name):
 440         """Pushes a patch on the stack
 441         """
 442         unapplied = self.get_unapplied()
 443         assert(name in unapplied)
 444
 445         self.__begin_stack_check()
 446
 447         patch = Patch(name, self.__patch_dir)
 448
 449         head = git.get_head()
 450         bottom = patch.get_bottom()
 451         top = patch.get_top()
 452
 453         ex = None
 454
 455         # top != bottom always since we have a commit for each patch
 456         if head == bottom:
 457             # reset the backup information
 458             patch.set_bottom(bottom, backup = True)
 459             patch.set_top(top, backup = True)
 460
 461             git.switch(top)
 462         else:
 463             # new patch needs to be refreshed.
 464             # The current patch is empty after merge.
 465             patch.set_bottom(head, backup = True)
 466             patch.set_top(head, backup = True)
 467             # merge/refresh can fail but the patch needs to be pushed
 468             try:
 469                 git.merge(bottom, head, top)
 470             except git.GitException, ex:
 471                 print >> sys.stderr, \
 472                       'The merge failed during "push". ' \
 473                       'Use "refresh" after fixing the conflicts'
 474                 pass
 475
 476         append_string(self.__applied_file, name)
 477
 478         unapplied.remove(name)
 479         f = file(self.__unapplied_file, 'w+')
 480         f.writelines([line + '\n' for line in unapplied])
 481         f.close()
 482
 483         self.__set_current(name)
 484
 485         # head == bottom case doesn't need to refresh the patch
 486         if head != bottom:
 487             if not ex:
 488                 # if the merge was OK and no conflicts, just refresh the patch
 489                 # The GIT cache was already updated by the merge operation
 490                 self.refresh_patch(cache_update = False)
 491             else:
 492                 raise StackException, str(ex)
 493
 494     def undo_push(self):
 495         name = self.get_current()
 496         assert(name)
 497
 498         patch = Patch(name, self.__patch_dir)
 499         git.reset()
 500         self.pop_patch(name)
 501         patch.restore_old_boundaries()
 502
 503     def pop_patch(self, name):
 504         """Pops the top patch from the stack
 505         """
 506         applied = self.get_applied()
 507         applied.reverse()
 508         assert(name in applied)
 509
 510         patch = Patch(name, self.__patch_dir)
 511
 512         git.switch(patch.get_bottom())
 513
 514         # save the new applied list
 515         idx = applied.index(name) + 1
 516
 517         popped = applied[:idx]
 518         popped.reverse()
 519         unapplied = popped + self.get_unapplied()
 520
 521         f = file(self.__unapplied_file, 'w+')
 522         f.writelines([line + '\n' for line in unapplied])
 523         f.close()
 524
 525         del applied[:idx]
 526         applied.reverse()
 527
 528         f = file(self.__applied_file, 'w+')
 529         f.writelines([line + '\n' for line in applied])
 530         f.close()
 531
 532         if applied == []:
 533             self.__set_current(None)
 534         else:
 535             self.__set_current(applied[-1])
 536
 537         self.__end_stack_check()
 538
 539     def empty_patch(self, name):
 540         """Returns True if the patch is empty
 541         """
 542         patch = Patch(name, self.__patch_dir)
 543         bottom = patch.get_bottom()
 544         top = patch.get_top()
 545
 546         if bottom == top:
 547             return True
 548         elif git.get_commit(top).get_tree() \
 549                  == git.get_commit(bottom).get_tree():
 550             return True
 551
 552         return False
 553
 554     def rename_patch(self, oldname, newname):
 555         applied = self.get_applied()
 556         unapplied = self.get_unapplied()
 557
 558         if newname in applied or newname in unapplied:
 559             raise StackException, 'Patch "%s" already exists' % newname
 560
 561         if oldname in unapplied:
 562             Patch(oldname, self.__patch_dir).rename(newname)
 563             unapplied[unapplied.index(oldname)] = newname
 564
 565             f = file(self.__unapplied_file, 'w+')
 566             f.writelines([line + '\n' for line in unapplied])
 567             f.close()
 568         elif oldname in applied:
 569             Patch(oldname, self.__patch_dir).rename(newname)
 570             if oldname == self.get_current():
 571                 self.__set_current(newname)
 572
 573             applied[applied.index(oldname)] = newname
 574
 575             f = file(self.__applied_file, 'w+')
 576             f.writelines([line + '\n' for line in applied])
 577             f.close()
 578         else:
 579             raise StackException, 'Unknown patch "%s"' % oldname