git_remote_helpers/git/repo.py

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