plugins/svn.py

   1
   2 from yap.yap import YapCore, YapError
   3 from yap.util import get_output, takes_options, run_command, run_safely, short_help
   4
   5 import os
   6 import tempfile
   7 import glob
   8 import pickle
   9 import re
  10 import bisect
  11 import struct
  12
  13 class RepoBlob(object):
  14     def __init__(self, keys):
  15         self.keys = keys
  16
  17         self.uuid = None
  18         self.branches = None
  19         self.tags = None
  20         self.metadata = {}
  21
  22     def add_metadata(self, branch):
  23         assert branch not in self.metadata
  24         gitdir = get_output("git rev-parse --git-dir")
  25         assert gitdir
  26         revmap = os.path.join(gitdir[0], "svn", "svn", branch, ".rev_map*")
  27         revmap = glob.glob(revmap)
  28         if not revmap:
  29             return
  30         uuid = revmap[0].split('.')[-1]
  31         if self.uuid is None:
  32             self.uuid = uuid
  33         assert self.uuid == uuid
  34         rev = get_output("git rev-parse refs/remotes/svn/%s" % branch)
  35         data = file(revmap[0]).read()
  36         self.metadata[branch] = rev[0], data
  37
  38 # Helper class for dealing with SVN metadata
  39 class SVNRevMap(object):
  40     RECORD_SZ = 24
  41     def __init__(self, filename):
  42         self.fd = file(filename, "rb")
  43         size = os.stat(filename)[6]
  44         self.nrecords = size / self.RECORD_SZ
  45
  46     def __getitem__(self, index):
  47         if index >= self.nrecords:
  48             raise IndexError
  49         return self.get_record(index)[0]
  50
  51     def __len__(self):
  52         return self.nrecords
  53
  54     def get_record(self, index):
  55         self.fd.seek(index * self.RECORD_SZ)
  56         record = self.fd.read(self.RECORD_SZ)
  57         return self.parse_record(record)
  58
  59     def parse_record(self, record):
  60         record = struct.unpack("!I20B", record)
  61         rev = record[0]
  62         hash = map(lambda x: "%02x" % x, record[1:])
  63         hash = ''.join(hash)
  64         return rev, hash
  65
  66 class SvnPlugin(YapCore):
  67     "Allow yap to interoperate with Subversion repositories"
  68
  69     revpat = re.compile('^r(\d+)$')
  70
  71     def _get_root(self, url):
  72         root = get_output("svn info %s 2>/dev/null | gawk '/Repository Root:/{print $3}'" % url)
  73         if not root:
  74             raise YapError("Not an SVN repo: %s" % url)
  75         return root[0]
  76
  77     def _configure_repo(self, url, fetch=None):
  78         root = self._get_root(url)
  79         os.system("git config svn-remote.svn.url %s" % root)
  80         if fetch is None:
  81             trunk = url.replace(root, '').strip('/')
  82         else:
  83             trunk = fetch.split(':')[0]
  84         os.system("git config svn-remote.svn.fetch %s:refs/remotes/svn/trunk"
  85                 % trunk)
  86
  87         branches = trunk.replace('trunk', 'branches')
  88         if branches != trunk:
  89             os.system("git config svn-remote.svn.branches %s/*:refs/remotes/svn/*" % branches)
  90         tags = trunk.replace('trunk', 'tags')
  91         if tags != trunk:
  92             os.system("git config svn-remote.svn.tags %s/*:refs/tags/*" % tags)
  93         self.cmd_repo("svn", url)
  94         os.system("git config yap.svn.enabled 1")
  95
  96     def _create_tagged_blob(self):
  97         keys = dict()
  98         for i in get_output("git config --list | grep ^svn-remote.svn"):
  99             k, v = i.split('=')
 100             keys[k] = v
 101         blob = RepoBlob(keys)
 102         for b in get_output("git for-each-ref --format='%(refname)' 'refs/remotes/svn/*'"):
 103             b = b.replace('refs/remotes/svn/', '')
 104             blob.add_metadata(b)
 105
 106         fd_w, fd_r = os.popen2("git hash-object -w --stdin")
 107         pickle.dump(blob, fd_w)
 108         fd_w.close()
 109         hash = fd_r.readline().strip()
 110         run_safely("git tag -f yap-svn %s" % hash)
 111
 112     def _cleanup_branches(self):
 113         for b in get_output("git for-each-ref --format='%(refname)' 'refs/remotes/svn/*@*'"):
 114             head = b.replace('refs/remotes/svn/', '')
 115             path = os.path.join(".git", "svn", "svn", head)
 116             files = os.listdir(path)
 117             for f in files:
 118                 os.unlink(os.path.join(path, f))
 119             os.rmdir(path)
 120
 121             ref = get_output("git rev-parse %s" % b)
 122             if ref:
 123                 run_safely("git update-ref -d %s %s" % (b, ref[0]))
 124
 125     def _clone_svn(self, url, directory=None, **flags):
 126         url = url.rstrip('/')
 127         if directory is None:
 128             directory = url.rsplit('/')[-1]
 129             directory = directory.replace('.git', '')
 130
 131         try:
 132             os.mkdir(directory)
 133         except OSError:
 134             raise YapError("Directory exists: %s" % directory)
 135         os.chdir(directory)
 136
 137         self.cmd_init()
 138         run_command("git config svn-remote.svn.noMetadata 1")
 139         self._configure_repo(url)
 140         os.system("git svn fetch -r %s:HEAD" % flags.get('-r', '1'))
 141
 142         self._cleanup_branches()
 143         self._create_tagged_blob()
 144
 145     def _push_svn(self, branch, **flags):
 146         if '-d' in flags:
 147             raise YapError("Deleting svn branches not supported")
 148         print "Verifying branch is up-to-date"
 149         run_safely("git svn fetch svn")
 150
 151         branch = branch.replace('refs/heads/', '')
 152         rev = get_output("git rev-parse --verify refs/remotes/svn/%s" % branch)
 153
 154         # Create the branch if requested
 155         if not rev:
 156             if '-c' not in flags:
 157                 raise YapError("No matching branch on the repo.  Use -c to create a new branch there.")
 158             src  = get_output("git svn info | gawk '/URL:/{print $2}'")[0]
 159             brev = get_output("git svn info | gawk '/Revision:/{print $2}'")[0]
 160             root = get_output("git config svn-remote.svn.url")[0]
 161             branch_path = get_output("git config svn-remote.svn.branches")[0].split(':')[0]
 162             branch_path = branch_path.rstrip('/*')
 163             dst = '/'.join((root, branch_path, branch))
 164
 165             # Create the branch in svn
 166             run_safely("svn cp -r%s %s %s -m 'create branch %s'"
 167                     % (brev, src, dst, branch))
 168             run_safely("git svn fetch svn")
 169             rev = get_output("git rev-parse refs/remotes/svn/%s 2>/dev/null" % branch)
 170             base = get_output("git svn find-rev r%s" % brev)
 171
 172             # Apply our commits to the new branch
 173             try:
 174                 fd, tmpfile = tempfile.mkstemp("yap")
 175                 os.close(fd)
 176                 print base[0]
 177                 os.system("git format-patch -k --stdout '%s' > %s"
 178                         % (base[0], tmpfile))
 179                 start = get_output("git rev-parse HEAD")
 180                 self.cmd_point("refs/remotes/svn/%s"
 181                         % branch, **{'-f': True})
 182
 183                 stat = os.stat(tmpfile)
 184                 size = stat[6]
 185                 if size > 0:
 186                     rc = run_command("git am -3 %s" % tmpfile)
 187                     if (rc):
 188                         self.cmd_point(start[0], **{'-f': True})
 189                         raise YapError("Failed to port changes to new svn branch")
 190             finally:
 191                 os.unlink(tmpfile)
 192
 193         base = get_output("git merge-base HEAD %s" % rev[0])
 194         if base[0] != rev[0]:
 195             raise YapError("Branch not up-to-date.  Update first.")
 196         current = get_output("git symbolic-ref HEAD")
 197         if not current:
 198             raise YapError("Not on a branch!")
 199         current = current[0].replace('refs/heads/', '')
 200         self._confirm_push(current, branch, "svn")
 201         if run_command("git update-index --refresh"):
 202             raise YapError("Can't push with uncommitted changes")
 203
 204         master = get_output("git rev-parse --verify refs/heads/master 2>/dev/null")
 205         os.system("git svn dcommit")
 206         run_safely("git svn rebase")
 207         if not master:
 208             master = get_output("git rev-parse --verify refs/heads/master 2>/dev/null")
 209             if master:
 210                 run_safely("git update-ref -d refs/heads/master %s" % master[0])
 211
 212     def _fetch_svn(self):
 213         os.system("git svn fetch svn")
 214         self._create_tagged_blob()
 215         self._cleanup_branches()
 216
 217     def _enabled(self):
 218         enabled = get_output("git config yap.svn.enabled")
 219         return bool(enabled)
 220
 221     def _applicable(self, args):
 222         if not self._enabled():
 223             return False
 224
 225         if args and args[0] == 'svn':
 226             return True
 227
 228         if not args:
 229             current = get_output("git symbolic-ref HEAD")
 230             if not current:
 231                 raise YapError("Not on a branch!")
 232
 233             current = current[0].replace('refs/heads/', '')
 234             remote, merge = self._get_tracking(current)
 235             if remote == "svn":
 236                 return True
 237
 238         return False
 239
 240     # Ensure users don't accidentally kill our "svn" repo
 241     def cmd_repo(self, *args, **flags):
 242         if self._enabled():
 243             if '-d' in flags and args and args[0] == "svn":
 244                 raise YapError("Refusing to delete special svn repository")
 245         super(SvnPlugin, self).cmd_repo(*args, **flags)
 246
 247     @takes_options("r:")
 248     def cmd_clone(self, *args, **flags):
 249         handled = True
 250         if not args:
 251             handled = False
 252         if (handled and not args[0].startswith("http")
 253                     and not args[0].startswith("svn")):
 254             handled = False
 255         if handled and run_command("svn info %s" % args[0]):
 256             handled = False
 257
 258         if handled:
 259             self._clone_svn(*args, **flags)
 260         else:
 261             super(SvnPlugin, self).cmd_clone(*args, **flags)
 262
 263         if self._enabled():
 264             # nothing to do
 265             return
 266
 267         run_safely("git fetch origin --tags")
 268         hash = get_output("git rev-parse --verify refs/tags/yap-svn 2>/dev/null")
 269         if not hash:
 270             return
 271
 272         fd = os.popen("git cat-file blob %s" % hash[0])
 273         blob = pickle.load(fd)
 274         for k, v in blob.keys.items():
 275             run_safely("git config %s %s" % (k, v))
 276
 277         self.cmd_repo("svn", blob.keys['svn-remote.svn.url'])
 278         os.system("git config yap.svn.enabled 1")
 279         run_safely("git fetch origin 'refs/remotes/svn/*:refs/remotes/svn/*'")
 280
 281         for b in blob.metadata.keys():
 282             branch = os.path.join(".git", "svn", "svn", b)
 283             os.makedirs(branch)
 284             fd = file(os.path.join(branch, ".rev_map.%s" % blob.uuid), "w")
 285
 286             rev, metadata = blob.metadata[b]
 287             fd.write(metadata)
 288             run_command("git update-ref refs/remotes/svn/%s %s" % (b, rev))
 289
 290     def cmd_fetch(self, *args, **flags):
 291         if self._applicable(args):
 292             self._fetch_svn()
 293             return
 294
 295         super(SvnPlugin, self).cmd_fetch(*args, **flags)
 296
 297     def cmd_push(self, *args, **flags):
 298         if self._applicable(args):
 299             if len (args) >= 2:
 300                 merge = args[1]
 301             else:
 302                 current = get_output("git symbolic-ref HEAD")
 303                 if not current:
 304                     raise YapError("Not on a branch!")
 305
 306                 current = current[0].replace('refs/heads/', '')
 307                 remote, merge = self._get_tracking(current)
 308                 if remote != "svn":
 309                     raise YapError("Need a branch name")
 310             self._push_svn(merge, **flags)
 311             return
 312         super(SvnPlugin, self).cmd_push(*args, **flags)
 313
 314     @short_help("change options for the svn plugin")
 315     def cmd_svn(self, subcmd):
 316         "enable"
 317
 318         if subcmd not in ["enable"]:
 319             raise TypeError
 320
 321         if "svn" in [x[0] for x in self._list_remotes()]:
 322             raise YapError("A remote named 'svn' already exists")
 323
 324
 325         if not run_command("git config svn-remote.svn.branches"):
 326             raise YapError("Cannot currently enable in a repository with svn branches")
 327
 328         url = get_output("git config svn-remote.svn.url")
 329         if not url:
 330             raise YapError("Not a git-svn repository?")
 331         fetch = get_output("git config svn-remote.svn.fetch")
 332         assert fetch
 333         lhs, rhs = fetch[0].split(':')
 334
 335
 336         rev = get_output("git rev-parse %s" % rhs)
 337         assert rev
 338         run_safely("git update-ref refs/remotes/svn/trunk %s" % rev[0])
 339
 340         url = '/'.join((url[0], lhs))
 341         self._configure_repo(url)
 342         run_safely("git update-ref -d %s %s" % (rhs, rev[0]))
 343
 344     # We are intentionally overriding a yap utility function
 345     def _resolve_rev(self, *args, **flags):
 346         rev = None
 347         if args:
 348             m = self.revpat.match(args[0])
 349             if m is not None:
 350                 revnum = int(m.group(1))
 351                 rev = get_output("git svn find-rev r%d 2>/dev/null" % revnum)
 352
 353                 if not rev:
 354                     gitdir = get_output("git rev-parse --git-dir")
 355                     assert gitdir
 356                     revmaps = os.path.join(gitdir[0], "svn", "svn",
 357                             "*", ".rev_map*")
 358                     print revmaps
 359                     revmaps = glob.glob(revmaps)
 360
 361                     for f in revmaps:
 362                         rm = SVNRevMap(f)
 363                         idx = bisect.bisect_left(rm, revnum)
 364                         if idx >= len(rm) or rm[idx] != revnum:
 365                             continue
 366
 367                         revnum, rev = rm.get_record(idx)
 368                         if hash == "0" * 40:
 369                             continue
 370                         break
 371                     pass
 372
 373         if not rev:
 374             rev = super(SvnPlugin, self)._resolve_rev(*args, **flags)
 375         return rev