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