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     print # end capabilities
  76
  77
  78 def do_list(repo, args):
  79     """Lists all known references.
  80
  81     Bug: This will always set the remote head to master for non-local
  82     repositories, since we have no way of determining what the remote
  83     head is at clone time.
  84     """
  85
  86     for ref in repo.revs:
  87         debug("? refs/heads/%s", ref)
  88         print "? refs/heads/%s" % ref
  89
  90     if repo.head:
  91         debug("@refs/heads/%s HEAD" % repo.head)
  92         print "@refs/heads/%s HEAD" % repo.head
  93     else:
  94         debug("@refs/heads/master HEAD")
  95         print "@refs/heads/master HEAD"
  96
  97     print # end list
  98
  99
 100 def update_local_repo(repo):
 101     """Updates (or clones) a local repo.
 102     """
 103
 104     if repo.local:
 105         return repo
 106
 107     path = repo.non_local.clone(repo.gitdir)
 108     repo.non_local.update(repo.gitdir)
 109     repo = local_repo(repo, path)
 110     return repo
 111
 112
 113 def do_import(repo, args):
 114     """Exports a fast-import stream from testgit for git to import.
 115     """
 116
 117     if len(args) != 1:
 118         die("Import needs exactly one ref")
 119
 120     if not repo.gitdir:
 121         die("Need gitdir to import")
 122
 123     repo = update_local_repo(repo)
 124     repo.exporter.export_repo(repo.gitdir, args)
 125
 126
 127 def do_export(repo, args):
 128     """Imports a fast-import stream from git to testgit.
 129     """
 130
 131     if not repo.gitdir:
 132         die("Need gitdir to export")
 133
 134     dirname = repo.get_base_path(repo.gitdir)
 135
 136     if not os.path.exists(dirname):
 137         os.makedirs(dirname)
 138
 139     path = os.path.join(dirname, 'testgit.marks')
 140     print path
 141     if os.path.exists(path):
 142         print path
 143     else:
 144         print ""
 145     sys.stdout.flush()
 146
 147     update_local_repo(repo)
 148     repo.importer.do_import(repo.gitdir)
 149     repo.non_local.push(repo.gitdir)
 150
 151
 152 COMMANDS = {
 153     'capabilities': do_capabilities,
 154     'list': do_list,
 155     'import': do_import,
 156     'export': do_export,
 157 }
 158
 159
 160 def sanitize(value):
 161     """Cleans up the url.
 162     """
 163
 164     if value.startswith('testgit::'):
 165         value = value[9:]
 166
 167     return value
 168
 169
 170 def read_one_line(repo):
 171     """Reads and processes one command.
 172     """
 173
 174     line = sys.stdin.readline()
 175
 176     cmdline = line
 177
 178     if not cmdline:
 179         warn("Unexpected EOF")
 180         return False
 181
 182     cmdline = cmdline.strip().split()
 183     if not cmdline:
 184         # Blank line means we're about to quit
 185         return False
 186
 187     cmd = cmdline.pop(0)
 188     debug("Got command '%s' with args '%s'", cmd, ' '.join(cmdline))
 189
 190     if cmd not in COMMANDS:
 191         die("Unknown command, %s", cmd)
 192
 193     func = COMMANDS[cmd]
 194     func(repo, cmdline)
 195     sys.stdout.flush()
 196
 197     return True
 198
 199
 200 def main(args):
 201     """Starts a new remote helper for the specified repository.
 202     """
 203
 204     if len(args) != 3:
 205         die("Expecting exactly three arguments.")
 206         sys.exit(1)
 207
 208     if os.getenv("GIT_DEBUG_TESTGIT"):
 209         import git_remote_helpers.util
 210         git_remote_helpers.util.DEBUG = True
 211
 212     alias = sanitize(args[1])
 213     url = sanitize(args[2])
 214
 215     if not alias.isalnum():
 216         warn("non-alnum alias '%s'", alias)
 217         alias = "tmp"
 218
 219     args[1] = alias
 220     args[2] = url
 221
 222     repo = get_repo(alias, url)
 223
 224     debug("Got arguments %s", args[1:])
 225
 226     more = True
 227
 228     while (more):
 229         more = read_one_line(repo)
 230
 231 if __name__ == '__main__':
 232     sys.exit(main(sys.argv))