Merge remote-tracking branch 'ko/maint' into jc/diff-index-quick-exit-early

* ko/maint: (4352 commits)
  git-submodule.sh: separate parens by a space to avoid confusing some shells
  Documentation/technical/api-diff.txt: correct name of diff_unmerge()
  read_gitfile_gently: use ssize_t to hold read result
  remove tests of always-false condition
  rerere.c: diagnose a corrupt MERGE_RR when hitting EOF between TAB and '\0'
  Git 1.7.5.3
  init/clone: remove short option -L and document --separate-git-dir
  do not read beyond end of malloc'd buffer
  git-svn: Fix git svn log --show-commit
  Git 1.7.5.2
  provide a copy of the LGPLv2.1
  test core.gitproxy configuration
  copy_gecos: fix not adding nlen to len when processing "&"
  Update draft release notes to 1.7.5.2
  Documentation/git-fsck.txt: fix typo: unreadable -> unreachable
  send-pack: avoid deadlock on git:// push with failed pack-objects
  connect: let callers know if connection is a socket
  connect: treat generic proxy processes like ssh processes
  sideband_demux(): fix decl-after-stmt
  t3503: test cherry picking and reverting root commits
  ...

Conflicts:
	diff.c

1 files changed, 75 insertions, 0 deletions

diff --git a/git_remote_helpers/git/repo.py b/git_remote_helpers/git/repo.py
new file mode 100644
index 0000000000..58e1cdb560
--- /dev/null
+++ b/git_remote_helpers/git/repo.py
@@ -0,0 +1,75 @@
+import os
+import subprocess
+
+def sanitize(rev, sep='\t'):
+    """Converts a for-each-ref line to a name/value pair.
+    """
+
+    splitrev = rev.split(sep)
+    branchval = splitrev[0]
+    branchname = splitrev[1].strip()
+    if branchname.startswith("refs/heads/"):
+        branchname = branchname[11:]
+
+    return branchname, branchval
+
+def is_remote(url):
+    """Checks whether the specified value is a remote url.
+    """
+
+    prefixes = ["http", "file", "git"]
+
+    for prefix in prefixes:
+        if url.startswith(prefix):
+            return True
+    return False
+
+class GitRepo(object):
+    """Repo object representing a repo.
+    """
+
+    def __init__(self, path):
+        """Initializes a new repo at the given path.
+        """
+
+        self.path = path
+        self.head = None
+        self.revmap = {}
+        self.local = not is_remote(self.path)
+
+        if(self.path.endswith('.git')):
+            self.gitpath = self.path
+        else:
+            self.gitpath = os.path.join(self.path, '.git')
+
+        if self.local and not os.path.exists(self.gitpath):
+            os.makedirs(self.gitpath)
+
+    def get_revs(self):
+        """Fetches all revs from the remote.
+        """
+
+        args = ["git", "ls-remote", self.gitpath]
+        path = ".cached_revs"
+        ofile = open(path, "w")
+
+        child = subprocess.Popen(args, stdout=ofile)
+        if child.wait() != 0:
+            raise CalledProcessError
+        output = open(path).readlines()
+        self.revmap = dict(sanitize(i) for i in output)
+        if "HEAD" in self.revmap:
+            del self.revmap["HEAD"]
+        self.revs = self.revmap.keys()
+        ofile.close()
+
+    def get_head(self):
+        """Determines the head of a local repo.
+        """
+
+        if not self.local:
+            return
+
+        path = os.path.join(self.gitpath, "HEAD")
+        head = open(path).readline()
+        self.head, _ = sanitize(head, ' ')