chiark - git - mdw - stgit/blob - stgit/commands/common.py

   1 """Function/variables common to all the commands
   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, os.path, re
  22 from optparse import OptionParser, make_option
  23
  24 from stgit.exception import *
  25 from stgit.utils import *
  26 from stgit.out import *
  27 from stgit.run import *
  28 from stgit import stack, git, basedir
  29 from stgit.config import config, file_extensions
  30
  31
  32 # Command exception class
  33 class CmdException(StgException):
  34     pass
  35
  36 # Utility functions
  37 class RevParseException(StgException):
  38     """Revision spec parse error."""
  39     pass
  40
  41 def parse_rev(rev):
  42     """Parse a revision specification into its
  43     patchname@branchname//patch_id parts. If no branch name has a slash
  44     in it, also accept / instead of //."""
  45     if '/' in ''.join(git.get_heads()):
  46         # We have branch names with / in them.
  47         branch_chars = r'[^@]'
  48         patch_id_mark = r'//'
  49     else:
  50         # No / in branch names.
  51         branch_chars = r'[^@/]'
  52         patch_id_mark = r'(/|//)'
  53     patch_re = r'(?P<patch>[^@/]+)'
  54     branch_re = r'@(?P<branch>%s+)' % branch_chars
  55     patch_id_re = r'%s(?P<patch_id>[a-z.]*)' % patch_id_mark
  56
  57     # Try //patch_id.
  58     m = re.match(r'^%s$' % patch_id_re, rev)
  59     if m:
  60         return None, None, m.group('patch_id')
  61
  62     # Try path[@branch]//patch_id.
  63     m = re.match(r'^%s(%s)?%s$' % (patch_re, branch_re, patch_id_re), rev)
  64     if m:
  65         return m.group('patch'), m.group('branch'), m.group('patch_id')
  66
  67     # Try patch[@branch].
  68     m = re.match(r'^%s(%s)?$' % (patch_re, branch_re), rev)
  69     if m:
  70         return m.group('patch'), m.group('branch'), None
  71
  72     # No, we can't parse that.
  73     raise RevParseException
  74
  75 def git_id(crt_series, rev):
  76     """Return the GIT id
  77     """
  78     if not rev:
  79         return None
  80     try:
  81         patch, branch, patch_id = parse_rev(rev)
  82         if branch == None:
  83             series = crt_series
  84         else:
  85             series = stack.Series(branch)
  86         if patch == None:
  87             patch = series.get_current()
  88             if not patch:
  89                 raise CmdException, 'No patches applied'
  90         if patch in series.get_applied() or patch in series.get_unapplied() or \
  91                patch in series.get_hidden():
  92             if patch_id in ['top', '', None]:
  93                 return series.get_patch(patch).get_top()
  94             elif patch_id == 'bottom':
  95                 return series.get_patch(patch).get_bottom()
  96             elif patch_id == 'top.old':
  97                 return series.get_patch(patch).get_old_top()
  98             elif patch_id == 'bottom.old':
  99                 return series.get_patch(patch).get_old_bottom()
 100             elif patch_id == 'log':
 101                 return series.get_patch(patch).get_log()
 102         if patch == 'base' and patch_id == None:
 103             return series.get_base()
 104     except RevParseException:
 105         pass
 106     return git.rev_parse(rev + '^{commit}')
 107
 108 def check_local_changes():
 109     if git.local_changes():
 110         raise CmdException, \
 111               'local changes in the tree. Use "refresh" or "status --reset"'
 112
 113 def check_head_top_equal(crt_series):
 114     if not crt_series.head_top_equal():
 115         raise CmdException(
 116 """HEAD and top are not the same. This can happen if you
 117    modify a branch with git. "stg repair --help" explains
 118    more about what to do next.""")
 119
 120 def check_conflicts():
 121     if os.path.exists(os.path.join(basedir.get(), 'conflicts')):
 122         raise CmdException, \
 123               'Unsolved conflicts. Please resolve them first or\n' \
 124               '  revert the changes with "status --reset"'
 125
 126 def print_crt_patch(crt_series, branch = None):
 127     if not branch:
 128         patch = crt_series.get_current()
 129     else:
 130         patch = stack.Series(branch).get_current()
 131
 132     if patch:
 133         out.info('Now at patch "%s"' % patch)
 134     else:
 135         out.info('No patches applied')
 136
 137 def resolved(filename, reset = None):
 138     if reset:
 139         reset_file = filename + file_extensions()[reset]
 140         if os.path.isfile(reset_file):
 141             if os.path.isfile(filename):
 142                 os.remove(filename)
 143             os.rename(reset_file, filename)
 144
 145     git.update_cache([filename], force = True)
 146
 147     for ext in file_extensions().values():
 148         fn = filename + ext
 149         if os.path.isfile(fn):
 150             os.remove(fn)
 151
 152 def resolved_all(reset = None):
 153     conflicts = git.get_conflicts()
 154     if conflicts:
 155         for filename in conflicts:
 156             resolved(filename, reset)
 157         os.remove(os.path.join(basedir.get(), 'conflicts'))
 158
 159 def push_patches(crt_series, patches, check_merged = False):
 160     """Push multiple patches onto the stack. This function is shared
 161     between the push and pull commands
 162     """
 163     forwarded = crt_series.forward_patches(patches)
 164     if forwarded > 1:
 165         out.info('Fast-forwarded patches "%s" - "%s"'
 166                  % (patches[0], patches[forwarded - 1]))
 167     elif forwarded == 1:
 168         out.info('Fast-forwarded patch "%s"' % patches[0])
 169
 170     names = patches[forwarded:]
 171
 172     # check for patches merged upstream
 173     if names and check_merged:
 174         out.start('Checking for patches merged upstream')
 175
 176         merged = crt_series.merged_patches(names)
 177
 178         out.done('%d found' % len(merged))
 179     else:
 180         merged = []
 181
 182     for p in names:
 183         out.start('Pushing patch "%s"' % p)
 184
 185         if p in merged:
 186             crt_series.push_empty_patch(p)
 187             out.done('merged upstream')
 188         else:
 189             modified = crt_series.push_patch(p)
 190
 191             if crt_series.empty_patch(p):
 192                 out.done('empty patch')
 193             elif modified:
 194                 out.done('modified')
 195             else:
 196                 out.done()
 197
 198 def pop_patches(crt_series, patches, keep = False):
 199     """Pop the patches in the list from the stack. It is assumed that
 200     the patches are listed in the stack reverse order.
 201     """
 202     if len(patches) == 0:
 203         out.info('Nothing to push/pop')
 204     else:
 205         p = patches[-1]
 206         if len(patches) == 1:
 207             out.start('Popping patch "%s"' % p)
 208         else:
 209             out.start('Popping patches "%s" - "%s"' % (patches[0], p))
 210         crt_series.pop_patch(p, keep)
 211         out.done()
 212
 213 def parse_patches(patch_args, patch_list, boundary = 0, ordered = False):
 214     """Parse patch_args list for patch names in patch_list and return
 215     a list. The names can be individual patches and/or in the
 216     patch1..patch2 format.
 217     """
 218     patches = []
 219
 220     for name in patch_args:
 221         pair = name.split('..')
 222         for p in pair:
 223             if p and not p in patch_list:
 224                 raise CmdException, 'Unknown patch name: %s' % p
 225
 226         if len(pair) == 1:
 227             # single patch name
 228             pl = pair
 229         elif len(pair) == 2:
 230             # patch range [p1]..[p2]
 231             # inclusive boundary
 232             if pair[0]:
 233                 first = patch_list.index(pair[0])
 234             else:
 235                 first = -1
 236             # exclusive boundary
 237             if pair[1]:
 238                 last = patch_list.index(pair[1]) + 1
 239             else:
 240                 last = -1
 241
 242             # only cross the boundary if explicitly asked
 243             if not boundary:
 244                 boundary = len(patch_list)
 245             if first < 0:
 246                 if last <= boundary:
 247                     first = 0
 248                 else:
 249                     first = boundary
 250             if last < 0:
 251                 if first < boundary:
 252                     last = boundary
 253                 else:
 254                     last = len(patch_list)
 255
 256             if last > first:
 257                 pl = patch_list[first:last]
 258             else:
 259                 pl = patch_list[(last - 1):(first + 1)]
 260                 pl.reverse()
 261         else:
 262             raise CmdException, 'Malformed patch name: %s' % name
 263
 264         for p in pl:
 265             if p in patches:
 266                 raise CmdException, 'Duplicate patch name: %s' % p
 267
 268         patches += pl
 269
 270     if ordered:
 271         patches = [p for p in patch_list if p in patches]
 272
 273     return patches
 274
 275 def name_email(address):
 276     """Return a tuple consisting of the name and email parsed from a
 277     standard 'name <email>' or 'email (name)' string
 278     """
 279     address = re.sub('[\\\\"]', '\\\\\g<0>', address)
 280     str_list = re.findall('^(.*)\s*<(.*)>\s*$', address)
 281     if not str_list:
 282         str_list = re.findall('^(.*)\s*\((.*)\)\s*$', address)
 283         if not str_list:
 284             raise CmdException, 'Incorrect "name <email>"/"email (name)" string: %s' % address
 285         return ( str_list[0][1], str_list[0][0] )
 286
 287     return str_list[0]
 288
 289 def name_email_date(address):
 290     """Return a tuple consisting of the name, email and date parsed
 291     from a 'name <email> date' string
 292     """
 293     address = re.sub('[\\\\"]', '\\\\\g<0>', address)
 294     str_list = re.findall('^(.*)\s*<(.*)>\s*(.*)\s*$', address)
 295     if not str_list:
 296         raise CmdException, 'Incorrect "name <email> date" string: %s' % address
 297
 298     return str_list[0]
 299
 300 def address_or_alias(addr_str):
 301     """Return the address if it contains an e-mail address or look up
 302     the aliases in the config files.
 303     """
 304     def __address_or_alias(addr):
 305         if not addr:
 306             return None
 307         if addr.find('@') >= 0:
 308             # it's an e-mail address
 309             return addr
 310         alias = config.get('mail.alias.'+addr)
 311         if alias:
 312             # it's an alias
 313             return alias
 314         raise CmdException, 'unknown e-mail alias: %s' % addr
 315
 316     addr_list = [__address_or_alias(addr.strip())
 317                  for addr in addr_str.split(',')]
 318     return ', '.join([addr for addr in addr_list if addr])
 319
 320 def prepare_rebase(crt_series):
 321     # pop all patches
 322     applied = crt_series.get_applied()
 323     if len(applied) > 0:
 324         out.start('Popping all applied patches')
 325         crt_series.pop_patch(applied[0])
 326         out.done()
 327     return applied
 328
 329 def rebase(crt_series, target):
 330     try:
 331         tree_id = git_id(crt_series, target)
 332     except:
 333         # it might be that we use a custom rebase command with its own
 334         # target type
 335         tree_id = target
 336     if tree_id == git.get_head():
 337         out.info('Already at "%s", no need for rebasing.' % target)
 338         return
 339     if target:
 340         out.start('Rebasing to "%s"' % target)
 341     else:
 342         out.start('Rebasing to the default target')
 343     git.rebase(tree_id = tree_id)
 344     out.done()
 345
 346 def post_rebase(crt_series, applied, nopush, merged):
 347     # memorize that we rebased to here
 348     crt_series._set_field('orig-base', git.get_head())
 349     # push the patches back
 350     if not nopush:
 351         push_patches(crt_series, applied, merged)
 352
 353 #
 354 # Patch description/e-mail/diff parsing
 355 #
 356 def __end_descr(line):
 357     return re.match('---\s*$', line) or re.match('diff -', line) or \
 358             re.match('Index: ', line)
 359
 360 def __split_descr_diff(string):
 361     """Return the description and the diff from the given string
 362     """
 363     descr = diff = ''
 364     top = True
 365
 366     for line in string.split('\n'):
 367         if top:
 368             if not __end_descr(line):
 369                 descr += line + '\n'
 370                 continue
 371             else:
 372                 top = False
 373         diff += line + '\n'
 374
 375     return (descr.rstrip(), diff)
 376
 377 def __parse_description(descr):
 378     """Parse the patch description and return the new description and
 379     author information (if any).
 380     """
 381     subject = body = ''
 382     authname = authemail = authdate = None
 383
 384     descr_lines = [line.rstrip() for line in  descr.split('\n')]
 385     if not descr_lines:
 386         raise CmdException, "Empty patch description"
 387
 388     lasthdr = 0
 389     end = len(descr_lines)
 390
 391     # Parse the patch header
 392     for pos in range(0, end):
 393         if not descr_lines[pos]:
 394            continue
 395         # check for a "From|Author:" line
 396         if re.match('\s*(?:from|author):\s+', descr_lines[pos], re.I):
 397             auth = re.findall('^.*?:\s+(.*)$', descr_lines[pos])[0]
 398             authname, authemail = name_email(auth)
 399             lasthdr = pos + 1
 400             continue
 401         # check for a "Date:" line
 402         if re.match('\s*date:\s+', descr_lines[pos], re.I):
 403             authdate = re.findall('^.*?:\s+(.*)$', descr_lines[pos])[0]
 404             lasthdr = pos + 1
 405             continue
 406         if subject:
 407             break
 408         # get the subject
 409         subject = descr_lines[pos]
 410         lasthdr = pos + 1
 411
 412     # get the body
 413     if lasthdr < end:
 414         body = reduce(lambda x, y: x + '\n' + y, descr_lines[lasthdr:], '')
 415
 416     return (subject + body, authname, authemail, authdate)
 417
 418 def parse_mail(msg):
 419     """Parse the message object and return (description, authname,
 420     authemail, authdate, diff)
 421     """
 422     from email.Header import decode_header, make_header
 423
 424     def __decode_header(header):
 425         """Decode a qp-encoded e-mail header as per rfc2047"""
 426         try:
 427             words_enc = decode_header(header)
 428             hobj = make_header(words_enc)
 429         except Exception, ex:
 430             raise CmdException, 'header decoding error: %s' % str(ex)
 431         return unicode(hobj).encode('utf-8')
 432
 433     # parse the headers
 434     if msg.has_key('from'):
 435         authname, authemail = name_email(__decode_header(msg['from']))
 436     else:
 437         authname = authemail = None
 438
 439     # '\n\t' can be found on multi-line headers
 440     descr = __decode_header(msg['subject']).replace('\n\t', ' ')
 441     authdate = msg['date']
 442
 443     # remove the '[*PATCH*]' expression in the subject
 444     if descr:
 445         descr = re.findall('^(\[.*?[Pp][Aa][Tt][Cc][Hh].*?\])?\s*(.*)$',
 446                            descr)[0][1]
 447     else:
 448         raise CmdException, 'Subject: line not found'
 449
 450     # the rest of the message
 451     msg_text = ''
 452     for part in msg.walk():
 453         if part.get_content_type() == 'text/plain':
 454             msg_text += part.get_payload(decode = True)
 455
 456     rem_descr, diff = __split_descr_diff(msg_text)
 457     if rem_descr:
 458         descr += '\n\n' + rem_descr
 459
 460     # parse the description for author information
 461     descr, descr_authname, descr_authemail, descr_authdate = \
 462            __parse_description(descr)
 463     if descr_authname:
 464         authname = descr_authname
 465     if descr_authemail:
 466         authemail = descr_authemail
 467     if descr_authdate:
 468        authdate = descr_authdate
 469
 470     return (descr, authname, authemail, authdate, diff)
 471
 472 def parse_patch(fobj):
 473     """Parse the input file and return (description, authname,
 474     authemail, authdate, diff)
 475     """
 476     descr, diff = __split_descr_diff(fobj.read())
 477     descr, authname, authemail, authdate = __parse_description(descr)
 478
 479     # we don't yet have an agreed place for the creation date.
 480     # Just return None
 481     return (descr, authname, authemail, authdate, diff)
 482
 483 def readonly_constant_property(f):
 484     """Decorator that converts a function that computes a value to an
 485     attribute that returns the value. The value is computed only once,
 486     the first time it is accessed."""
 487     def new_f(self):
 488         n = '__' + f.__name__
 489         if not hasattr(self, n):
 490             setattr(self, n, f(self))
 491         return getattr(self, n)
 492     return property(new_f)
 493
 494 class DirectoryException(StgException):
 495     pass
 496
 497 class _Directory(object):
 498     def __init__(self, needs_current_series = True):
 499         self.needs_current_series =  needs_current_series
 500     @readonly_constant_property
 501     def git_dir(self):
 502         try:
 503             return Run('git', 'rev-parse', '--git-dir'
 504                        ).discard_stderr().output_one_line()
 505         except RunException:
 506             raise DirectoryException('No git repository found')
 507     @readonly_constant_property
 508     def __topdir_path(self):
 509         try:
 510             lines = Run('git', 'rev-parse', '--show-cdup'
 511                         ).discard_stderr().output_lines()
 512             if len(lines) == 0:
 513                 return '.'
 514             elif len(lines) == 1:
 515                 return lines[0]
 516             else:
 517                 raise RunException('Too much output')
 518         except RunException:
 519             raise DirectoryException('No git repository found')
 520     @readonly_constant_property
 521     def is_inside_git_dir(self):
 522         return { 'true': True, 'false': False
 523                  }[Run('git', 'rev-parse', '--is-inside-git-dir'
 524                        ).output_one_line()]
 525     @readonly_constant_property
 526     def is_inside_worktree(self):
 527         return { 'true': True, 'false': False
 528                  }[Run('git', 'rev-parse', '--is-inside-work-tree'
 529                        ).output_one_line()]
 530     def cd_to_topdir(self):
 531         os.chdir(self.__topdir_path)
 532
 533 class DirectoryAnywhere(_Directory):
 534     def setup(self):
 535         pass
 536
 537 class DirectoryHasRepository(_Directory):
 538     def setup(self):
 539         self.git_dir # might throw an exception
 540
 541 class DirectoryInWorktree(DirectoryHasRepository):
 542     def setup(self):
 543         DirectoryHasRepository.setup(self)
 544         if not self.is_inside_worktree:
 545             raise DirectoryException('Not inside a git worktree')
 546
 547 class DirectoryGotoToplevel(DirectoryInWorktree):
 548     def setup(self):
 549         DirectoryInWorktree.setup(self)
 550         self.cd_to_topdir()