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 = ""
  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 "gitdir"
  74     print "refspec refs/heads/*:%s*" % repo.prefix
  75
  76     print # end capabilities
  77
  78
  79 def do_list(repo, args):
  80     """Lists all known references.
  81
  82     Bug: This will always set the remote head to master for non-local
  83     repositories, since we have no way of determining what the remote
  84     head is at clone time.
  85     """
  86
  87     for ref in repo.revs:
  88         debug("? refs/heads/%s", ref)
  89         print "? refs/heads/%s" % ref
  90
  91     if repo.head:
  92         debug("@refs/heads/%s HEAD" % repo.head)
  93         print "@refs/heads/%s HEAD" % repo.head
  94     else:
  95         debug("@refs/heads/master HEAD")
  96         print "@refs/heads/master HEAD"
  97
  98     print # end list
  99
 100
 101 def update_local_repo(repo):
 102     """Updates (or clones) a local repo.
 103     """
 104
 105     if repo.local:
 106         return repo
 107
 108     path = repo.non_local.clone(repo.gitdir)
 109     repo.non_local.update(repo.gitdir)
 110     repo = local_repo(repo, path)
 111     return repo
 112
 113
 114 def do_import(repo, args):
 115     """Exports a fast-import stream from testgit for git to import.
 116     """
 117
 118     if len(args) != 1:
 119         die("Import needs exactly one ref")
 120
 121     if not repo.gitdir:
 122         die("Need gitdir to import")
 123
 124     repo = update_local_repo(repo)
 125     repo.exporter.export_repo(repo.gitdir)
 126
 127
 128 def do_export(repo, args):
 129     """Imports a fast-import stream from git to testgit.
 130     """
 131
 132     if not repo.gitdir:
 133         die("Need gitdir to export")
 134
 135     dirname = repo.get_base_path(repo.gitdir)
 136
 137     if not os.path.exists(dirname):
 138         os.makedirs(dirname)
 139
 140     path = os.path.join(dirname, 'testgit.marks')
 141     print path
 142     if os.path.exists(path):
 143         print path
 144     else:
 145         print ""
 146     sys.stdout.flush()
 147
 148     update_local_repo(repo)
 149     repo.importer.do_import(repo.gitdir)
 150     repo.non_local.push(repo.gitdir)
 151
 152
 153 def do_gitdir(repo, args):
 154     """Stores the location of the gitdir.
 155     """
 156
 157     if not args:
 158         die("gitdir needs an argument")
 159
 160     repo.gitdir = ' '.join(args)
 161
 162
 163 COMMANDS = {
 164     'capabilities': do_capabilities,
 165     'list': do_list,
 166     'import': do_import,
 167     'export': do_export,
 168     'gitdir': do_gitdir,
 169 }
 170
 171
 172 def sanitize(value):
 173     """Cleans up the url.
 174     """
 175
 176     if value.startswith('testgit::'):
 177         value = value[9:]
 178
 179     return value
 180
 181
 182 def read_one_line(repo):
 183     """Reads and processes one command.
 184     """
 185
 186     line = sys.stdin.readline()
 187
 188     cmdline = line
 189
 190     if not cmdline:
 191         warn("Unexpected EOF")
 192         return False
 193
 194     cmdline = cmdline.strip().split()
 195     if not cmdline:
 196         # Blank line means we're about to quit
 197         return False
 198
 199     cmd = cmdline.pop(0)
 200     debug("Got command '%s' with args '%s'", cmd, ' '.join(cmdline))
 201
 202     if cmd not in COMMANDS:
 203         die("Unknown command, %s", cmd)
 204
 205     func = COMMANDS[cmd]
 206     func(repo, cmdline)
 207     sys.stdout.flush()
 208
 209     return True
 210
 211
 212 def main(args):
 213     """Starts a new remote helper for the specified repository.
 214     """
 215
 216     if len(args) != 3:
 217         die("Expecting exactly three arguments.")
 218         sys.exit(1)
 219
 220     if os.getenv("GIT_DEBUG_TESTGIT"):
 221         import git_remote_helpers.util
 222         git_remote_helpers.util.DEBUG = True
 223
 224     alias = sanitize(args[1])
 225     url = sanitize(args[2])
 226
 227     if not alias.isalnum():
 228         warn("non-alnum alias '%s'", alias)
 229         alias = "tmp"
 230
 231     args[1] = alias
 232     args[2] = url
 233
 234     repo = get_repo(alias, url)
 235
 236     debug("Got arguments %s", args[1:])
 237
 238     more = True
 239
 240     while (more):
 241         more = read_one_line(repo)
 242
 243 if __name__ == '__main__':
 244     sys.exit(main(sys.argv))