git_remote_helpers/git/repo.py

   1 import os
   2 import subprocess
   3
   4 def sanitize(rev, sep='\t'):
   5     """Converts a for-each-ref line to a name/value pair.
   6     """
   7
   8     splitrev = rev.split(sep)
   9     branchval = splitrev[0]
  10     branchname = splitrev[1].strip()
  11     if branchname.startswith("refs/heads/"):
  12         branchname = branchname[11:]
  13
  14     return branchname, branchval
  15
  16 def is_remote(url):
  17     """Checks whether the specified value is a remote url.
  18     """
  19
  20     prefixes = ["http", "file", "git"]
  21
  22     for prefix in prefixes:
  23         if url.startswith(prefix):
  24             return True
  25     return False
  26
  27 class GitRepo(object):
  28     """Repo object representing a repo.
  29     """
  30
  31     def __init__(self, path):
  32         """Initializes a new repo at the given path.
  33         """
  34
  35         self.path = path
  36         self.head = None
  37         self.revmap = {}
  38         self.local = not is_remote(self.path)
  39
  40         if(self.path.endswith('.git')):
  41             self.gitpath = self.path
  42         else:
  43             self.gitpath = os.path.join(self.path, '.git')
  44
  45         if self.local and not os.path.exists(self.gitpath):
  46             os.makedirs(self.gitpath)
  47
  48     def get_revs(self):
  49         """Fetches all revs from the remote.
  50         """
  51
  52         args = ["git", "ls-remote", self.gitpath]
  53         path = ".cached_revs"
  54         ofile = open(path, "w")
  55
  56         child = subprocess.Popen(args, stdout=ofile)
  57         if child.wait() != 0:
  58             raise CalledProcessError
  59         output = open(path).readlines()
  60         self.revmap = dict(sanitize(i) for i in output)
  61         if "HEAD" in self.revmap:
  62             del self.revmap["HEAD"]
  63         self.revs = self.revmap.keys()
  64         ofile.close()
  65
  66     def get_head(self):
  67         """Determines the head of a local repo.
  68         """
  69
  70         if not self.local:
  71             return
  72
  73         path = os.path.join(self.gitpath, "HEAD")
  74         head = open(path).readline()
  75         self.head, _ = sanitize(head, ' ')