comparison mercurial/win32.py @ 10218:750b7a4f01f6 stable

Add support for relinking on Windows.

Test and minor code change by Patrick Mézard <[e-mail]>

10217:2bbb4c8eb27e

    except pywintypes.error, details:
        raise OSError(errno.EINVAL, 'target implements hardlinks improperly')
    except NotImplementedError: # Another fake error win Win98
        raise OSError(errno.EINVAL, 'Hardlinking not supported')

def nlinks(pathname):
    """Return number of hardlinks for the given file."""
    try:
        fh = win32file.CreateFile(pathname,
            win32file.GENERIC_READ, win32file.FILE_SHARE_READ,
            None, win32file.OPEN_EXISTING, 0, None)
        res = win32file.GetFileInformationByHandle(fh)
        fh.Close()
        return res[7]
    except pywintypes.error:
        return os.lstat(pathname).st_nlink

def testpid(pid):
    '''return True if pid is still running or unable to
    determine, False otherwise'''
    try:

10218:750b7a4f01f6

    except pywintypes.error, details:
        raise OSError(errno.EINVAL, 'target implements hardlinks improperly')
    except NotImplementedError: # Another fake error win Win98
        raise OSError(errno.EINVAL, 'Hardlinking not supported')

def _getfileinfo(pathname):
    """Return number of hardlinks for the given file."""
    try:
        fh = win32file.CreateFile(pathname,
            win32file.GENERIC_READ, win32file.FILE_SHARE_READ,
            None, win32file.OPEN_EXISTING, 0, None)
        res = win32file.GetFileInformationByHandle(fh)
        fh.Close()
        return res
    except pywintypes.error:
        return None

def nlinks(pathname):
    """Return number of hardlinks for the given file."""
    res = _getfileinfo(pathname)
    if res is not None:
        return res[7]
    else:
        return os.lstat(pathname).st_nlink

def samefile(fpath1, fpath2):
    """Returns whether fpath1 and fpath2 refer to the same file. This is only
    guaranteed to work for files, not directories."""
    res1 = _getfileinfo(fpath1)
    res2 = _getfileinfo(fpath2)
    if res1 is not None and res2 is not None:
        # Index 4 is the volume serial number, and 8 and 9 contain the file ID
        return res1[4] == res2[4] and res1[8] == res2[8] and res1[9] == res2[9]
    else:
        return False

def samedevice(fpath1, fpath2):
    """Returns whether fpath1 and fpath2 are on the same device. This is only
    guaranteed to work for files, not directories."""
    res1 = _getfileinfo(fpath1)
    res2 = _getfileinfo(fpath2)
    if res1 is not None and res2 is not None:
        return res1[4] == res2[4]
    else:
        return False

def testpid(pid):
    '''return True if pid is still running or unable to
    determine, False otherwise'''
    try: