mdw@git.distorted.org.uk Git - stgit/blob - stgit/git.py

   1 """Python GIT interface
   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, re, gitmergeonefile
  22 from shutil import copyfile
  23
  24 from stgit import basedir
  25 from stgit.utils import *
  26 from stgit.out import *
  27 from stgit.run import *
  28 from stgit.config import config
  29
  30 # git exception class
  31 class GitException(Exception):
  32     pass
  33
  34 # When a subprocess has a problem, we want the exception to be a
  35 # subclass of GitException.
  36 class GitRunException(GitException):
  37     pass
  38 class GRun(Run):
  39     exc = GitRunException
  40
  41
  42 #
  43 # Classes
  44 #
  45
  46 class Person:
  47     """An author, committer, etc."""
  48     def __init__(self, name = None, email = None, date = '',
  49                  desc = None):
  50         self.name = self.email = self.date = None
  51         if name or email or date:
  52             assert not desc
  53             self.name = name
  54             self.email = email
  55             self.date = date
  56         elif desc:
  57             assert not (name or email or date)
  58             def parse_desc(s):
  59                 m = re.match(r'^(.+)<(.+)>(.*)$', s)
  60                 assert m
  61                 return [x.strip() or None for x in m.groups()]
  62             self.name, self.email, self.date = parse_desc(desc)
  63     def set_name(self, val):
  64         if val:
  65             self.name = val
  66     def set_email(self, val):
  67         if val:
  68             self.email = val
  69     def set_date(self, val):
  70         if val:
  71             self.date = val
  72     def __str__(self):
  73         if self.name and self.email:
  74             return '%s <%s>' % (self.name, self.email)
  75         else:
  76             raise GitException, 'not enough identity data'
  77
  78 class Commit:
  79     """Handle the commit objects
  80     """
  81     def __init__(self, id_hash):
  82         self.__id_hash = id_hash
  83
  84         lines = GRun('git-cat-file', 'commit', id_hash).output_lines()
  85         for i in range(len(lines)):
  86             line = lines[i]
  87             if not line:
  88                 break # we've seen all the header fields
  89             key, val = line.split(' ', 1)
  90             if key == 'tree':
  91                 self.__tree = val
  92             elif key == 'author':
  93                 self.__author = val
  94             elif key == 'committer':
  95                 self.__committer = val
  96             else:
  97                 pass # ignore other headers
  98         self.__log = '\n'.join(lines[i+1:])
  99
 100     def get_id_hash(self):
 101         return self.__id_hash
 102
 103     def get_tree(self):
 104         return self.__tree
 105
 106     def get_parent(self):
 107         parents = self.get_parents()
 108         if parents:
 109             return parents[0]
 110         else:
 111             return None
 112
 113     def get_parents(self):
 114         return GRun('git-rev-list', '--parents', '--max-count=1', self.__id_hash
 115                     ).output_one_line().split()[1:]
 116
 117     def get_author(self):
 118         return self.__author
 119
 120     def get_committer(self):
 121         return self.__committer
 122
 123     def get_log(self):
 124         return self.__log
 125
 126     def __str__(self):
 127         return self.get_id_hash()
 128
 129 # dictionary of Commit objects, used to avoid multiple calls to git
 130 __commits = dict()
 131
 132 #
 133 # Functions
 134 #
 135
 136 def get_commit(id_hash):
 137     """Commit objects factory. Save/look-up them in the __commits
 138     dictionary
 139     """
 140     global __commits
 141
 142     if id_hash in __commits:
 143         return __commits[id_hash]
 144     else:
 145         commit = Commit(id_hash)
 146         __commits[id_hash] = commit
 147         return commit
 148
 149 def get_conflicts():
 150     """Return the list of file conflicts
 151     """
 152     conflicts_file = os.path.join(basedir.get(), 'conflicts')
 153     if os.path.isfile(conflicts_file):
 154         f = file(conflicts_file)
 155         names = [line.strip() for line in f.readlines()]
 156         f.close()
 157         return names
 158     else:
 159         return None
 160
 161 def exclude_files():
 162     files = [os.path.join(basedir.get(), 'info', 'exclude')]
 163     user_exclude = config.get('core.excludesfile')
 164     if user_exclude:
 165         files.append(user_exclude)
 166     return files
 167
 168 def tree_status(files = None, tree_id = 'HEAD', unknown = False,
 169                   noexclude = True, verbose = False, diff_flags = []):
 170     """Get the status of all changed files, or of a selected set of
 171     files. Returns a list of pairs - (status, filename).
 172
 173     If 'files' is None, it will check all files, and optionally all
 174     unknown files.  If 'files' is a list, it will only check the files
 175     in the list.
 176     """
 177     assert files == None or not unknown
 178
 179     if verbose:
 180         out.start('Checking for changes in the working directory')
 181
 182     refresh_index()
 183
 184     cache_files = []
 185
 186     # unknown files
 187     if unknown:
 188         cmd = ['git-ls-files', '-z', '--others', '--directory',
 189                '--no-empty-directory']
 190         if not noexclude:
 191             cmd += ['--exclude=%s' % s for s in
 192                     ['*.[ao]', '*.pyc', '.*', '*~', '#*', 'TAGS', 'tags']]
 193             cmd += ['--exclude-per-directory=.gitignore']
 194             cmd += ['--exclude-from=%s' % fn
 195                     for fn in exclude_files()
 196                     if os.path.exists(fn)]
 197
 198         lines = GRun(*cmd).raw_output().split('\0')
 199         cache_files += [('?', line) for line in lines if line]
 200
 201     # conflicted files
 202     conflicts = get_conflicts()
 203     if not conflicts:
 204         conflicts = []
 205     cache_files += [('C', filename) for filename in conflicts
 206                     if files == None or filename in files]
 207
 208     # the rest
 209     args = diff_flags + [tree_id]
 210     if files != None:
 211         args += ['--'] + files
 212     for line in GRun('git-diff-index', *args).output_lines():
 213         fs = tuple(line.rstrip().split(' ',4)[-1].split('\t',1))
 214         if fs[1] not in conflicts:
 215             cache_files.append(fs)
 216
 217     if verbose:
 218         out.done()
 219
 220     assert files == None or set(f for s,f in cache_files) <= set(files)
 221     return cache_files
 222
 223 def local_changes(verbose = True):
 224     """Return true if there are local changes in the tree
 225     """
 226     return len(tree_status(verbose = verbose)) != 0
 227
 228 def get_heads():
 229     heads = []
 230     hr = re.compile(r'^[0-9a-f]{40} refs/heads/(.+)$')
 231     for line in GRun('git-show-ref', '--heads').output_lines():
 232         m = hr.match(line)
 233         heads.append(m.group(1))
 234     return heads
 235
 236 # HEAD value cached
 237 __head = None
 238
 239 def get_head():
 240     """Verifies the HEAD and returns the SHA1 id that represents it
 241     """
 242     global __head
 243
 244     if not __head:
 245         __head = rev_parse('HEAD')
 246     return __head
 247
 248 def get_head_file():
 249     """Returns the name of the file pointed to by the HEAD link
 250     """
 251     return strip_prefix('refs/heads/',
 252                         GRun('git-symbolic-ref', 'HEAD').output_one_line())
 253
 254 def set_head_file(ref):
 255     """Resets HEAD to point to a new ref
 256     """
 257     # head cache flushing is needed since we might have a different value
 258     # in the new head
 259     __clear_head_cache()
 260     try:
 261         GRun('git-symbolic-ref', 'HEAD', 'refs/heads/%s' % ref).run()
 262     except GitRunException:
 263         raise GitException, 'Could not set head to "%s"' % ref
 264
 265 def set_ref(ref, val):
 266     """Point ref at a new commit object."""
 267     try:
 268         GRun('git-update-ref', ref, val).run()
 269     except GitRunException:
 270         raise GitException, 'Could not update %s to "%s".' % (ref, val)
 271
 272 def set_branch(branch, val):
 273     set_ref('refs/heads/%s' % branch, val)
 274
 275 def __set_head(val):
 276     """Sets the HEAD value
 277     """
 278     global __head
 279
 280     if not __head or __head != val:
 281         set_ref('HEAD', val)
 282         __head = val
 283
 284     # only allow SHA1 hashes
 285     assert(len(__head) == 40)
 286
 287 def __clear_head_cache():
 288     """Sets the __head to None so that a re-read is forced
 289     """
 290     global __head
 291
 292     __head = None
 293
 294 def refresh_index():
 295     """Refresh index with stat() information from the working directory.
 296     """
 297     GRun('git-update-index', '-q', '--unmerged', '--refresh').run()
 298
 299 def rev_parse(git_id):
 300     """Parse the string and return a verified SHA1 id
 301     """
 302     try:
 303         return GRun('git-rev-parse', '--verify', git_id).output_one_line()
 304     except GitRunException:
 305         raise GitException, 'Unknown revision: %s' % git_id
 306
 307 def ref_exists(ref):
 308     try:
 309         rev_parse(ref)
 310         return True
 311     except GitException:
 312         return False
 313
 314 def branch_exists(branch):
 315     return ref_exists('refs/heads/%s' % branch)
 316
 317 def create_branch(new_branch, tree_id = None):
 318     """Create a new branch in the git repository
 319     """
 320     if branch_exists(new_branch):
 321         raise GitException, 'Branch "%s" already exists' % new_branch
 322
 323     current_head = get_head()
 324     set_head_file(new_branch)
 325     __set_head(current_head)
 326
 327     # a checkout isn't needed if new branch points to the current head
 328     if tree_id:
 329         switch(tree_id)
 330
 331     if os.path.isfile(os.path.join(basedir.get(), 'MERGE_HEAD')):
 332         os.remove(os.path.join(basedir.get(), 'MERGE_HEAD'))
 333
 334 def switch_branch(new_branch):
 335     """Switch to a git branch
 336     """
 337     global __head
 338
 339     if not branch_exists(new_branch):
 340         raise GitException, 'Branch "%s" does not exist' % new_branch
 341
 342     tree_id = rev_parse('refs/heads/%s^{commit}' % new_branch)
 343     if tree_id != get_head():
 344         refresh_index()
 345         try:
 346             GRun('git-read-tree', '-u', '-m', get_head(), tree_id).run()
 347         except GitRunException:
 348             raise GitException, 'git-read-tree failed (local changes maybe?)'
 349         __head = tree_id
 350     set_head_file(new_branch)
 351
 352     if os.path.isfile(os.path.join(basedir.get(), 'MERGE_HEAD')):
 353         os.remove(os.path.join(basedir.get(), 'MERGE_HEAD'))
 354
 355 def delete_ref(ref):
 356     if not ref_exists(ref):
 357         raise GitException, '%s does not exist' % ref
 358     sha1 = GRun('git-show-ref', '-s', ref).output_one_line()
 359     try:
 360         GRun('git-update-ref', '-d', ref, sha1).run()
 361     except GitRunException:
 362         raise GitException, 'Failed to delete ref %s' % ref
 363
 364 def delete_branch(name):
 365     delete_ref('refs/heads/%s' % name)
 366
 367 def rename_ref(from_ref, to_ref):
 368     if not ref_exists(from_ref):
 369         raise GitException, '"%s" does not exist' % from_ref
 370     if ref_exists(to_ref):
 371         raise GitException, '"%s" already exists' % to_ref
 372
 373     sha1 = GRun('git-show-ref', '-s', from_ref).output_one_line()
 374     try:
 375         GRun('git-update-ref', to_ref, sha1, '0'*40).run()
 376     except GitRunException:
 377         raise GitException, 'Failed to create new ref %s' % to_ref
 378     try:
 379         GRun('git-update-ref', '-d', from_ref, sha1).run()
 380     except GitRunException:
 381         raise GitException, 'Failed to delete ref %s' % from_ref
 382
 383 def rename_branch(from_name, to_name):
 384     """Rename a git branch."""
 385     rename_ref('refs/heads/%s' % from_name, 'refs/heads/%s' % to_name)
 386     if get_head_file() == from_name:
 387         set_head_file(to_name)
 388     reflog_dir = os.path.join(basedir.get(), 'logs', 'refs', 'heads')
 389     if os.path.exists(reflog_dir) \
 390            and os.path.exists(os.path.join(reflog_dir, from_name)):
 391         rename(reflog_dir, from_name, to_name)
 392
 393 def add(names):
 394     """Add the files or recursively add the directory contents
 395     """
 396     # generate the file list
 397     files = []
 398     for i in names:
 399         if not os.path.exists(i):
 400             raise GitException, 'Unknown file or directory: %s' % i
 401
 402         if os.path.isdir(i):
 403             # recursive search. We only add files
 404             for root, dirs, local_files in os.walk(i):
 405                 for name in [os.path.join(root, f) for f in local_files]:
 406                     if os.path.isfile(name):
 407                         files.append(os.path.normpath(name))
 408         elif os.path.isfile(i):
 409             files.append(os.path.normpath(i))
 410         else:
 411             raise GitException, '%s is not a file or directory' % i
 412
 413     if files:
 414         try:
 415             GRun('git-update-index', '--add', '--').xargs(files)
 416         except GitRunException:
 417             raise GitException, 'Unable to add file'
 418
 419 def __copy_single(source, target, target2=''):
 420     """Copy file or dir named 'source' to name target+target2"""
 421
 422     # "source" (file or dir) must match one or more git-controlled file
 423     realfiles = GRun('git-ls-files', source).output_lines()
 424     if len(realfiles) == 0:
 425         raise GitException, '"%s" matches no git-controled files' % source
 426
 427     if os.path.isdir(source):
 428         # physically copy the files, and record them to add them in one run
 429         newfiles = []
 430         re_string='^'+source+'/(.*)$'
 431         prefix_regexp = re.compile(re_string)
 432         for f in [f.strip() for f in realfiles]:
 433             m = prefix_regexp.match(f)
 434             if not m:
 435                 raise Exception, '"%s" does not match "%s"' % (f, re_string)
 436             newname = target+target2+'/'+m.group(1)
 437             if not os.path.exists(os.path.dirname(newname)):
 438                 os.makedirs(os.path.dirname(newname))
 439             copyfile(f, newname)
 440             newfiles.append(newname)
 441
 442         add(newfiles)
 443     else: # files, symlinks, ...
 444         newname = target+target2
 445         copyfile(source, newname)
 446         add([newname])
 447
 448
 449 def copy(filespecs, target):
 450     if os.path.isdir(target):
 451         # target is a directory: copy each entry on the command line,
 452         # with the same name, into the target
 453         target = target.rstrip('/')
 454
 455         # first, check that none of the children of the target
 456         # matching the command line aleady exist
 457         for filespec in filespecs:
 458             entry = target+ '/' + os.path.basename(filespec.rstrip('/'))
 459             if os.path.exists(entry):
 460                 raise GitException, 'Target "%s" already exists' % entry
 461
 462         for filespec in filespecs:
 463             filespec = filespec.rstrip('/')
 464             basename = '/' + os.path.basename(filespec)
 465             __copy_single(filespec, target, basename)
 466
 467     elif os.path.exists(target):
 468         raise GitException, 'Target "%s" exists but is not a directory' % target
 469     elif len(filespecs) != 1:
 470         raise GitException, 'Cannot copy more than one file to non-directory'
 471
 472     else:
 473         # at this point: len(filespecs)==1 and target does not exist
 474
 475         # check target directory
 476         targetdir = os.path.dirname(target)
 477         if targetdir != '' and not os.path.isdir(targetdir):
 478             raise GitException, 'Target directory "%s" does not exist' % targetdir
 479
 480         __copy_single(filespecs[0].rstrip('/'), target)
 481
 482
 483 def rm(files, force = False):
 484     """Remove a file from the repository
 485     """
 486     if not force:
 487         for f in files:
 488             if os.path.exists(f):
 489                 raise GitException, '%s exists. Remove it first' %f
 490         if files:
 491             GRun('git-update-index', '--remove', '--').xargs(files)
 492     else:
 493         if files:
 494             GRun('git-update-index', '--force-remove', '--').xargs(files)
 495
 496 # Persons caching
 497 __user = None
 498 __author = None
 499 __committer = None
 500
 501 def user():
 502     """Return the user information.
 503     """
 504     global __user
 505     if not __user:
 506         name=config.get('user.name')
 507         email=config.get('user.email')
 508         __user = Person(name, email)
 509     return __user;
 510
 511 def author():
 512     """Return the author information.
 513     """
 514     global __author
 515     if not __author:
 516         try:
 517             # the environment variables take priority over config
 518             try:
 519                 date = os.environ['GIT_AUTHOR_DATE']
 520             except KeyError:
 521                 date = ''
 522             __author = Person(os.environ['GIT_AUTHOR_NAME'],
 523                               os.environ['GIT_AUTHOR_EMAIL'],
 524                               date)
 525         except KeyError:
 526             __author = user()
 527     return __author
 528
 529 def committer():
 530     """Return the author information.
 531     """
 532     global __committer
 533     if not __committer:
 534         try:
 535             # the environment variables take priority over config
 536             try:
 537                 date = os.environ['GIT_COMMITTER_DATE']
 538             except KeyError:
 539                 date = ''
 540             __committer = Person(os.environ['GIT_COMMITTER_NAME'],
 541                                  os.environ['GIT_COMMITTER_EMAIL'],
 542                                  date)
 543         except KeyError:
 544             __committer = user()
 545     return __committer
 546
 547 def update_cache(files = None, force = False):
 548     """Update the cache information for the given files
 549     """
 550     cache_files = tree_status(files, verbose = False)
 551
 552     # everything is up-to-date
 553     if len(cache_files) == 0:
 554         return False
 555
 556     # check for unresolved conflicts
 557     if not force and [x for x in cache_files
 558                       if x[0] not in ['M', 'N', 'A', 'D']]:
 559         raise GitException, 'Updating cache failed: unresolved conflicts'
 560
 561     # update the cache
 562     add_files = [x[1] for x in cache_files if x[0] in ['N', 'A']]
 563     rm_files =  [x[1] for x in cache_files if x[0] in ['D']]
 564     m_files =   [x[1] for x in cache_files if x[0] in ['M']]
 565
 566     GRun('git-update-index', '--add', '--').xargs(add_files)
 567     GRun('git-update-index', '--force-remove', '--').xargs(rm_files)
 568     GRun('git-update-index', '--').xargs(m_files)
 569
 570     return True
 571
 572 def commit(message, files = None, parents = None, allowempty = False,
 573            cache_update = True, tree_id = None, set_head = False,
 574            author_name = None, author_email = None, author_date = None,
 575            committer_name = None, committer_email = None):
 576     """Commit the current tree to repository
 577     """
 578     if not parents:
 579         parents = []
 580
 581     # Get the tree status
 582     if cache_update and parents != []:
 583         changes = update_cache(files)
 584         if not changes and not allowempty:
 585             raise GitException, 'No changes to commit'
 586
 587     # get the commit message
 588     if not message:
 589         message = '\n'
 590     elif message[-1:] != '\n':
 591         message += '\n'
 592
 593     # write the index to repository
 594     if tree_id == None:
 595         tree_id = GRun('git-write-tree').output_one_line()
 596         set_head = True
 597
 598     # the commit
 599     env = {}
 600     if author_name:
 601         env['GIT_AUTHOR_NAME'] = author_name
 602     if author_email:
 603         env['GIT_AUTHOR_EMAIL'] = author_email
 604     if author_date:
 605         env['GIT_AUTHOR_DATE'] = author_date
 606     if committer_name:
 607         env['GIT_COMMITTER_NAME'] = committer_name
 608     if committer_email:
 609         env['GIT_COMMITTER_EMAIL'] = committer_email
 610     commit_id = GRun('git-commit-tree', tree_id,
 611                      *sum([['-p', p] for p in parents], [])
 612                      ).env(env).raw_input(message).output_one_line()
 613     if set_head:
 614         __set_head(commit_id)
 615
 616     return commit_id
 617
 618 def apply_diff(rev1, rev2, check_index = True, files = None):
 619     """Apply the diff between rev1 and rev2 onto the current
 620     index. This function doesn't need to raise an exception since it
 621     is only used for fast-pushing a patch. If this operation fails,
 622     the pushing would fall back to the three-way merge.
 623     """
 624     if check_index:
 625         index_opt = ['--index']
 626     else:
 627         index_opt = []
 628
 629     if not files:
 630         files = []
 631
 632     diff_str = diff(files, rev1, rev2)
 633     if diff_str:
 634         try:
 635             GRun('git-apply', *index_opt).raw_input(
 636                 diff_str).discard_stderr().no_output()
 637         except GitRunException:
 638             return False
 639
 640     return True
 641
 642 def merge(base, head1, head2, recursive = False):
 643     """Perform a 3-way merge between base, head1 and head2 into the
 644     local tree
 645     """
 646     refresh_index()
 647
 648     err_output = None
 649     if recursive:
 650         # this operation tracks renames but it is slower (used in
 651         # general when pushing or picking patches)
 652         try:
 653             # discard output to mask the verbose prints of the tool
 654             GRun('git-merge-recursive', base, '--', head1, head2
 655                  ).discard_output()
 656         except GitRunException, ex:
 657             err_output = str(ex)
 658             pass
 659     else:
 660         # the fast case where we don't track renames (used when the
 661         # distance between base and heads is small, i.e. folding or
 662         # synchronising patches)
 663         try:
 664             GRun('git-read-tree', '-u', '-m', '--aggressive',
 665                  base, head1, head2).run()
 666         except GitRunException:
 667             raise GitException, 'git-read-tree failed (local changes maybe?)'
 668
 669     # check the index for unmerged entries
 670     files = {}
 671     stages_re = re.compile('^([0-7]+) ([0-9a-f]{40}) ([1-3])\t(.*)$', re.S)
 672
 673     for line in GRun('git-ls-files', '--unmerged', '--stage', '-z'
 674                      ).raw_output().split('\0'):
 675         if not line:
 676             continue
 677
 678         mode, hash, stage, path = stages_re.findall(line)[0]
 679
 680         if not path in files:
 681             files[path] = {}
 682             files[path]['1'] = ('', '')
 683             files[path]['2'] = ('', '')
 684             files[path]['3'] = ('', '')
 685
 686         files[path][stage] = (mode, hash)
 687
 688     if err_output and not files:
 689         # if no unmerged files, there was probably a different type of
 690         # error and we have to abort the merge
 691         raise GitException, err_output
 692
 693     # merge the unmerged files
 694     errors = False
 695     for path in files:
 696         # remove additional files that might be generated for some
 697         # newer versions of GIT
 698         for suffix in [base, head1, head2]:
 699             if not suffix:
 700                 continue
 701             fname = path + '~' + suffix
 702             if os.path.exists(fname):
 703                 os.remove(fname)
 704
 705         stages = files[path]
 706         if gitmergeonefile.merge(stages['1'][1], stages['2'][1],
 707                                  stages['3'][1], path, stages['1'][0],
 708                                  stages['2'][0], stages['3'][0]) != 0:
 709             errors = True
 710
 711     if errors:
 712         raise GitException, 'GIT index merging failed (possible conflicts)'
 713
 714 def diff(files = None, rev1 = 'HEAD', rev2 = None, diff_flags = []):
 715     """Show the diff between rev1 and rev2
 716     """
 717     if not files:
 718         files = []
 719
 720     if rev1 and rev2:
 721         return GRun('git-diff-tree', '-p',
 722                     *(diff_flags + [rev1, rev2, '--'] + files)).raw_output()
 723     elif rev1 or rev2:
 724         refresh_index()
 725         if rev2:
 726             return GRun('git-diff-index', '-p', '-R',
 727                         *(diff_flags + [rev2, '--'] + files)).raw_output()
 728         else:
 729             return GRun('git-diff-index', '-p',
 730                         *(diff_flags + [rev1, '--'] + files)).raw_output()
 731     else:
 732         return ''
 733
 734 # TODO: take another parameter representing a diff string as we
 735 # usually invoke git.diff() form the calling functions
 736 def diffstat(files = None, rev1 = 'HEAD', rev2 = None):
 737     """Return the diffstat between rev1 and rev2."""
 738     return GRun('git-apply', '--stat', '--summary'
 739                 ).raw_input(diff(files, rev1, rev2)).raw_output()
 740
 741 def files(rev1, rev2, diff_flags = []):
 742     """Return the files modified between rev1 and rev2
 743     """
 744
 745     result = []
 746     for line in GRun('git-diff-tree', *(diff_flags + ['-r', rev1, rev2])
 747                      ).output_lines():
 748         result.append('%s %s' % tuple(line.split(' ', 4)[-1].split('\t', 1)))
 749
 750     return '\n'.join(result)
 751
 752 def barefiles(rev1, rev2):
 753     """Return the files modified between rev1 and rev2, without status info
 754     """
 755
 756     result = []
 757     for line in GRun('git-diff-tree', '-r', rev1, rev2).output_lines():
 758         result.append(line.split(' ', 4)[-1].split('\t', 1)[-1])
 759
 760     return '\n'.join(result)
 761
 762 def pretty_commit(commit_id = 'HEAD', diff_flags = []):
 763     """Return a given commit (log + diff)
 764     """
 765     return GRun('git-diff-tree',
 766                 *(diff_flags
 767                   + ['--cc', '--always', '--pretty', '-r', commit_id])
 768                 ).raw_output()
 769
 770 def checkout(files = None, tree_id = None, force = False):
 771     """Check out the given or all files
 772     """
 773     if tree_id:
 774         try:
 775             GRun('git-read-tree', '--reset', tree_id).run()
 776         except GitRunException:
 777             raise GitException, 'Failed git-read-tree --reset %s' % tree_id
 778
 779     cmd = ['git-checkout-index', '-q', '-u']
 780     if force:
 781         cmd.append('-f')
 782     if files:
 783         GRun(*(cmd + ['--'])).xargs(files)
 784     else:
 785         GRun(*(cmd + ['-a'])).run()
 786
 787 def switch(tree_id, keep = False):
 788     """Switch the tree to the given id
 789     """
 790     if not keep:
 791         refresh_index()
 792         try:
 793             GRun('git-read-tree', '-u', '-m', get_head(), tree_id).run()
 794         except GitRunException:
 795             raise GitException, 'git-read-tree failed (local changes maybe?)'
 796
 797     __set_head(tree_id)
 798
 799 def reset(files = None, tree_id = None, check_out = True):
 800     """Revert the tree changes relative to the given tree_id. It removes
 801     any local changes
 802     """
 803     if not tree_id:
 804         tree_id = get_head()
 805
 806     if check_out:
 807         cache_files = tree_status(files, tree_id)
 808         # files which were added but need to be removed
 809         rm_files =  [x[1] for x in cache_files if x[0] in ['A']]
 810
 811         checkout(files, tree_id, True)
 812         # checkout doesn't remove files
 813         map(os.remove, rm_files)
 814
 815     # if the reset refers to the whole tree, switch the HEAD as well
 816     if not files:
 817         __set_head(tree_id)
 818
 819 def fetch(repository = 'origin', refspec = None):
 820     """Fetches changes from the remote repository, using 'git-fetch'
 821     by default.
 822     """
 823     # we update the HEAD
 824     __clear_head_cache()
 825
 826     args = [repository]
 827     if refspec:
 828         args.append(refspec)
 829
 830     command = config.get('branch.%s.stgit.fetchcmd' % get_head_file()) or \
 831               config.get('stgit.fetchcmd')
 832     GRun(*(command.split() + args)).run()
 833
 834 def pull(repository = 'origin', refspec = None):
 835     """Fetches changes from the remote repository, using 'git-pull'
 836     by default.
 837     """
 838     # we update the HEAD
 839     __clear_head_cache()
 840
 841     args = [repository]
 842     if refspec:
 843         args.append(refspec)
 844
 845     command = config.get('branch.%s.stgit.pullcmd' % get_head_file()) or \
 846               config.get('stgit.pullcmd')
 847     GRun(*(command.split() + args)).run()
 848
 849 def rebase(tree_id = None):
 850     """Rebase the current tree to the give tree_id. The tree_id
 851     argument may be something other than a GIT id if an external
 852     command is invoked.
 853     """
 854     command = config.get('branch.%s.stgit.rebasecmd' % get_head_file()) \
 855                 or config.get('stgit.rebasecmd')
 856     if tree_id:
 857         args = [tree_id]
 858     elif command:
 859         args = []
 860     else:
 861         raise GitException, 'Default rebasing requires a commit id'
 862     if command:
 863         # clear the HEAD cache as the custom rebase command will update it
 864         __clear_head_cache()
 865         GRun(*(command.split() + args)).run()
 866     else:
 867         # default rebasing
 868         reset(tree_id = tree_id)
 869
 870 def repack():
 871     """Repack all objects into a single pack
 872     """
 873     GRun('git-repack', '-a', '-d', '-f').run()
 874
 875 def apply_patch(filename = None, diff = None, base = None,
 876                 fail_dump = True):
 877     """Apply a patch onto the current or given index. There must not
 878     be any local changes in the tree, otherwise the command fails
 879     """
 880     if diff is None:
 881         if filename:
 882             f = file(filename)
 883         else:
 884             f = sys.stdin
 885         diff = f.read()
 886         if filename:
 887             f.close()
 888
 889     if base:
 890         orig_head = get_head()
 891         switch(base)
 892     else:
 893         refresh_index()
 894
 895     try:
 896         GRun('git-apply', '--index').raw_input(diff).no_output()
 897     except GitRunException:
 898         if base:
 899             switch(orig_head)
 900         if fail_dump:
 901             # write the failed diff to a file
 902             f = file('.stgit-failed.patch', 'w+')
 903             f.write(diff)
 904             f.close()
 905             out.warn('Diff written to the .stgit-failed.patch file')
 906
 907         raise
 908
 909     if base:
 910         top = commit(message = 'temporary commit used for applying a patch',
 911                      parents = [base])
 912         switch(orig_head)
 913         merge(base, orig_head, top)
 914
 915 def clone(repository, local_dir):
 916     """Clone a remote repository. At the moment, just use the
 917     'git-clone' script
 918     """
 919     GRun('git-clone', repository, local_dir).run()
 920
 921 def modifying_revs(files, base_rev, head_rev):
 922     """Return the revisions from the list modifying the given files."""
 923     return GRun('git-rev-list', '%s..%s' % (base_rev, head_rev), '--', *files
 924                 ).output_lines()
 925
 926 def refspec_localpart(refspec):
 927     m = re.match('^[^:]*:([^:]*)$', refspec)
 928     if m:
 929         return m.group(1)
 930     else:
 931         raise GitException, 'Cannot parse refspec "%s"' % line
 932
 933 def refspec_remotepart(refspec):
 934     m = re.match('^([^:]*):[^:]*$', refspec)
 935     if m:
 936         return m.group(1)
 937     else:
 938         raise GitException, 'Cannot parse refspec "%s"' % line
 939
 940
 941 def __remotes_from_config():
 942     return config.sections_matching(r'remote\.(.*)\.url')
 943
 944 def __remotes_from_dir(dir):
 945     d = os.path.join(basedir.get(), dir)
 946     if os.path.exists(d):
 947         return os.listdir(d)
 948     else:
 949         return []
 950
 951 def remotes_list():
 952     """Return the list of remotes in the repository
 953     """
 954     return (set(__remotes_from_config())
 955             | set(__remotes_from_dir('remotes'))
 956             | set(__remotes_from_dir('branches')))
 957
 958 def remotes_local_branches(remote):
 959     """Returns the list of local branches fetched from given remote
 960     """
 961
 962     branches = []
 963     if remote in __remotes_from_config():
 964         for line in config.getall('remote.%s.fetch' % remote):
 965             branches.append(refspec_localpart(line))
 966     elif remote in __remotes_from_dir('remotes'):
 967         stream = open(os.path.join(basedir.get(), 'remotes', remote), 'r')
 968         for line in stream:
 969             # Only consider Pull lines
 970             m = re.match('^Pull: (.*)\n$', line)
 971             if m:
 972                 branches.append(refspec_localpart(m.group(1)))
 973         stream.close()
 974     elif remote in __remotes_from_dir('branches'):
 975         # old-style branches only declare one branch
 976         branches.append('refs/heads/'+remote);
 977     else:
 978         raise GitException, 'Unknown remote "%s"' % remote
 979
 980     return branches
 981
 982 def identify_remote(branchname):
 983     """Return the name for the remote to pull the given branchname
 984     from, or None if we believe it is a local branch.
 985     """
 986
 987     for remote in remotes_list():
 988         if branchname in remotes_local_branches(remote):
 989             return remote
 990
 991     # if we get here we've found nothing, the branch is a local one
 992     return None
 993
 994 def fetch_head():
 995     """Return the git id for the tip of the parent branch as left by
 996     'git fetch'.
 997     """
 998
 999     fetch_head=None
1000     stream = open(os.path.join(basedir.get(), 'FETCH_HEAD'), "r")
1001     for line in stream:
1002         # Only consider lines not tagged not-for-merge
1003         m = re.match('^([^\t]*)\t\t', line)
1004         if m:
1005             if fetch_head:
1006                 raise GitException, 'StGit does not support multiple FETCH_HEAD'
1007             else:
1008                 fetch_head=m.group(1)
1009     stream.close()
1010
1011     if not fetch_head:
1012         raise GitException, 'No for-merge remote head found in FETCH_HEAD'
1013
1014     # here we are sure to have a single fetch_head
1015     return fetch_head
1016
1017 def all_refs():
1018     """Return a list of all refs in the current repository.
1019     """
1020
1021     return [line.split()[1] for line in GRun('git-show-ref').output_lines()]