git-remote-testgit.py

   1 #!/usr/bin/env python
   2
   3 # hashlib is only available in python >= 2.5
   4 try:
   5     import hashlib
   6     _digest = hashlib.sha1
   7 except ImportError:
   8     import sha
   9     _digest = sha.new
  10 import sys
  11 import os
  12 sys.path.insert(0, os.getenv("GITPYTHONLIB","."))
  13
  14 from git_remote_helpers.util import die, debug, warn
  15 from git_remote_helpers.git.repo import GitRepo
  16 from git_remote_helpers.git.exporter import GitExporter
  17 from git_remote_helpers.git.importer import GitImporter
  18 from git_remote_helpers.git.non_local import NonLocalGit
  19
  20 def get_repo(alias, url):
  21     """Returns a git repository object initialized for usage.
  22     """
  23
  24     repo = GitRepo(url)
  25     repo.get_revs()
  26     repo.get_head()
  27
  28     hasher = _digest()
  29     hasher.update(repo.path)
  30     repo.hash = hasher.hexdigest()
  31
  32     repo.get_base_path = lambda base: os.path.join(
  33         base, 'info', 'fast-import', repo.hash)
  34
  35     prefix = 'refs/testgit/%s/' % alias
  36     debug("prefix: '%s'", prefix)
  37
  38     repo.gitdir = os.environ["GIT_DIR"]
  39     repo.alias = alias
  40     repo.prefix = prefix
  41
  42     repo.exporter = GitExporter(repo)
  43     repo.importer = GitImporter(repo)
  44     repo.non_local = NonLocalGit(repo)
  45
  46     return repo
  47
  48
  49 def local_repo(repo, path):
  50     """Returns a git repository object initalized for usage.
  51     """
  52
  53     local = GitRepo(path)
  54
  55     local.non_local = None
  56     local.gitdir = repo.gitdir
  57     local.alias = repo.alias
  58     local.prefix = repo.prefix
  59     local.hash = repo.hash
  60     local.get_base_path = repo.get_base_path
  61     local.exporter = GitExporter(local)
  62     local.importer = GitImporter(local)
  63
  64     return local
  65
  66
  67 def do_capabilities(repo, args):
  68     """Prints the supported capabilities.
  69     """
  70
  71     print "import"
  72     print "export"
  73     print "refspec refs/heads/*:%s*" % repo.prefix
  74
  75     dirname = repo.get_base_path(repo.gitdir)
  76
  77     if not os.path.exists(dirname):
  78         os.makedirs(dirname)
  79
  80     path = os.path.join(dirname, 'testgit.marks')
  81
  82     print "*export-marks %s" % path
  83     if os.path.exists(path):
  84         print "*import-marks %s" % path
  85
  86     print # end capabilities
  87
  88
  89 def do_list(repo, args):
  90     """Lists all known references.
  91
  92     Bug: This will always set the remote head to master for non-local
  93     repositories, since we have no way of determining what the remote
  94     head is at clone time.
  95     """
  96
  97     for ref in repo.revs:
  98         debug("? refs/heads/%s", ref)
  99         print "? refs/heads/%s" % ref
 100
 101     if repo.head:
 102         debug("@refs/heads/%s HEAD" % repo.head)
 103         print "@refs/heads/%s HEAD" % repo.head
 104     else:
 105         debug("@refs/heads/master HEAD")
 106         print "@refs/heads/master HEAD"
 107
 108     print # end list
 109
 110
 111 def update_local_repo(repo):
 112     """Updates (or clones) a local repo.
 113     """
 114
 115     if repo.local:
 116         return repo
 117
 118     path = repo.non_local.clone(repo.gitdir)
 119     repo.non_local.update(repo.gitdir)
 120     repo = local_repo(repo, path)
 121     return repo
 122
 123
 124 def do_import(repo, args):
 125     """Exports a fast-import stream from testgit for git to import.
 126     """
 127
 128     if len(args) != 1:
 129         die("Import needs exactly one ref")
 130
 131     if not repo.gitdir:
 132         die("Need gitdir to import")
 133
 134     ref = args[0]
 135     refs = [ref]
 136
 137     while True:
 138         line = sys.stdin.readline()
 139         if line == '\n':
 140             break
 141         if not line.startswith('import '):
 142             die("Expected import line.")
 143
 144         # strip of leading 'import '
 145         ref = line[7:].strip()
 146         refs.append(ref)
 147
 148     repo = update_local_repo(repo)
 149     repo.exporter.export_repo(repo.gitdir, refs)
 150
 151     print "done"
 152
 153
 154 def do_export(repo, args):
 155     """Imports a fast-import stream from git to testgit.
 156     """
 157
 158     if not repo.gitdir:
 159         die("Need gitdir to export")
 160
 161     update_local_repo(repo)
 162     changed = repo.importer.do_import(repo.gitdir)
 163
 164     if not repo.local:
 165         repo.non_local.push(repo.gitdir)
 166
 167     for ref in changed:
 168         print "ok %s" % ref
 169     print
 170
 171
 172 COMMANDS = {
 173     'capabilities': do_capabilities,
 174     'list': do_list,
 175     'import': do_import,
 176     'export': do_export,
 177 }
 178
 179
 180 def sanitize(value):
 181     """Cleans up the url.
 182     """
 183
 184     if value.startswith('testgit::'):
 185         value = value[9:]
 186
 187     return value
 188
 189
 190 def read_one_line(repo):
 191     """Reads and processes one command.
 192     """
 193
 194     line = sys.stdin.readline()
 195
 196     cmdline = line
 197
 198     if not cmdline:
 199         warn("Unexpected EOF")
 200         return False
 201
 202     cmdline = cmdline.strip().split()
 203     if not cmdline:
 204         # Blank line means we're about to quit
 205         return False
 206
 207     cmd = cmdline.pop(0)
 208     debug("Got command '%s' with args '%s'", cmd, ' '.join(cmdline))
 209
 210     if cmd not in COMMANDS:
 211         die("Unknown command, %s", cmd)
 212
 213     func = COMMANDS[cmd]
 214     func(repo, cmdline)
 215     sys.stdout.flush()
 216
 217     return True
 218
 219
 220 def main(args):
 221     """Starts a new remote helper for the specified repository.
 222     """
 223
 224     if len(args) != 3:
 225         die("Expecting exactly three arguments.")
 226         sys.exit(1)
 227
 228     if os.getenv("GIT_DEBUG_TESTGIT"):
 229         import git_remote_helpers.util
 230         git_remote_helpers.util.DEBUG = True
 231
 232     alias = sanitize(args[1])
 233     url = sanitize(args[2])
 234
 235     if not alias.isalnum():
 236         warn("non-alnum alias '%s'", alias)
 237         alias = "tmp"
 238
 239     args[1] = alias
 240     args[2] = url
 241
 242     repo = get_repo(alias, url)
 243
 244     debug("Got arguments %s", args[1:])
 245
 246     more = True
 247
 248     while (more):
 249         more = read_one_line(repo)
 250
 251 if __name__ == '__main__':
 252     sys.exit(main(sys.argv))