view mercurial/hgweb/common.py @ 2439:e8c4f3d3df8c

extend network protocol to stop clients from locking servers

now all repositories have capabilities slot, tuple with list of names.

if 'unbundle' capability present, repo supports push where client does
not need to lock server.  repository classes that have unbundle capability
also have unbundle method.

implemented for ssh now, will be base for push over http.

unbundle protocol acts this way.  server tells client what heads it
has during normal negotiate step.  client starts unbundle by repeat
server's heads back to it.  if server has new heads, abort immediately.
otherwise, transfer changes to server.  once data transferred, server
locks and checks heads again.  if heads same, changes can be added.
else someone else added heads, and server aborts.

if client wants to force server to add heads, sends special heads list of
'force'.

# hgweb/common.py - Utility functions needed by hgweb_mod and hgwebdir_mod
#
# Copyright 21 May 2005 - (c) 2005 Jake Edge <[e-mail]>
# Copyright 2005 Matt Mackall <[e-mail]>
#
# This software may be used and distributed according to the terms
# of the GNU General Public License, incorporated herein by reference.

import os, mimetypes
import os.path

def get_mtime(repo_path):
    hg_path = os.path.join(repo_path, ".hg")
    cl_path = os.path.join(hg_path, "00changelog.i")
    if os.path.exists(os.path.join(cl_path)):
        return os.stat(cl_path).st_mtime
    else:
        return os.stat(hg_path).st_mtime

def staticfile(directory, fname):
    """return a file inside directory with guessed content-type header

    fname always uses '/' as directory separator and isn't allowed to
    contain unusual path components.
    Content-type is guessed using the mimetypes module.
    Return an empty string if fname is illegal or file not found.

    """
    parts = fname.split('/')
    path = directory
    for part in parts:
        if (part in ('', os.curdir, os.pardir) or
            os.sep in part or os.altsep is not None and os.altsep in part):
            return ""
        path = os.path.join(path, part)
    try:
        os.stat(path)
        ct = mimetypes.guess_type(path)[0] or "text/plain"
        return "Content-type: %s\n\n%s" % (ct, file(path).read())
    except (TypeError, OSError):
        # illegal fname or unreadable file
        return ""