view mercurial/util_win32.py @ 7059:6a76cf980999

Improve error handling in osutil.c

1) In posix part set error when path is too long so instead of

SystemError: error returned without exception set

it will raise

ValueError: path too long

2) In Win32 part replace generic

PyErr_SetExcFromWindowsErrWithFilename

by

PyErr_SetFromWindowsErrWithFilename

The exception returned is WinError(based on OSError) and
some rudimentary errno translation is performed from Windows error range
to errno module friendly range so errors like ENOENT can be handled via symbolic
constant and consistently between Win32 and Posix.

# util_win32.py - utility functions that use win32 API
#
# Copyright 2005 Matt Mackall <[e-mail]>
# Copyright 2006 Vadim Gelfer <[e-mail]>
#
# This software may be used and distributed according to the terms of
# the GNU General Public License, incorporated herein by reference.

# Mark Hammond's win32all package allows better functionality on
# Windows.  this module overrides definitions in util.py.  if not
# available, import of this module will fail, and generic code will be
# used.

import win32api

import errno, os, sys, pywintypes, win32con, win32file, win32process
import cStringIO, winerror
import osutil
import util
from win32com.shell import shell,shellcon

class WinError:
    winerror_map = {
        winerror.ERROR_ACCESS_DENIED: errno.EACCES,
        winerror.ERROR_ACCOUNT_DISABLED: errno.EACCES,
        winerror.ERROR_ACCOUNT_RESTRICTION: errno.EACCES,
        winerror.ERROR_ALREADY_ASSIGNED: errno.EBUSY,
        winerror.ERROR_ALREADY_EXISTS: errno.EEXIST,
        winerror.ERROR_ARITHMETIC_OVERFLOW: errno.ERANGE,
        winerror.ERROR_BAD_COMMAND: errno.EIO,
        winerror.ERROR_BAD_DEVICE: errno.ENODEV,
        winerror.ERROR_BAD_DRIVER_LEVEL: errno.ENXIO,
        winerror.ERROR_BAD_EXE_FORMAT: errno.ENOEXEC,
        winerror.ERROR_BAD_FORMAT: errno.ENOEXEC,
        winerror.ERROR_BAD_LENGTH: errno.EINVAL,
        winerror.ERROR_BAD_PATHNAME: errno.ENOENT,
        winerror.ERROR_BAD_PIPE: errno.EPIPE,
        winerror.ERROR_BAD_UNIT: errno.ENODEV,
        winerror.ERROR_BAD_USERNAME: errno.EINVAL,
        winerror.ERROR_BROKEN_PIPE: errno.EPIPE,
        winerror.ERROR_BUFFER_OVERFLOW: errno.ENAMETOOLONG,
        winerror.ERROR_BUSY: errno.EBUSY,
        winerror.ERROR_BUSY_DRIVE: errno.EBUSY,
        winerror.ERROR_CALL_NOT_IMPLEMENTED: errno.ENOSYS,
        winerror.ERROR_CANNOT_MAKE: errno.EACCES,
        winerror.ERROR_CANTOPEN: errno.EIO,
        winerror.ERROR_CANTREAD: errno.EIO,
        winerror.ERROR_CANTWRITE: errno.EIO,
        winerror.ERROR_CRC: errno.EIO,
        winerror.ERROR_CURRENT_DIRECTORY: errno.EACCES,
        winerror.ERROR_DEVICE_IN_USE: errno.EBUSY,
        winerror.ERROR_DEV_NOT_EXIST: errno.ENODEV,
        winerror.ERROR_DIRECTORY: errno.EINVAL,
        winerror.ERROR_DIR_NOT_EMPTY: errno.ENOTEMPTY,
        winerror.ERROR_DISK_CHANGE: errno.EIO,
        winerror.ERROR_DISK_FULL: errno.ENOSPC,
        winerror.ERROR_DRIVE_LOCKED: errno.EBUSY,
        winerror.ERROR_ENVVAR_NOT_FOUND: errno.EINVAL,
        winerror.ERROR_EXE_MARKED_INVALID: errno.ENOEXEC,
        winerror.ERROR_FILENAME_EXCED_RANGE: errno.ENAMETOOLONG,
        winerror.ERROR_FILE_EXISTS: errno.EEXIST,
        winerror.ERROR_FILE_INVALID: errno.ENODEV,
        winerror.ERROR_FILE_NOT_FOUND: errno.ENOENT,
        winerror.ERROR_GEN_FAILURE: errno.EIO,
        winerror.ERROR_HANDLE_DISK_FULL: errno.ENOSPC,
        winerror.ERROR_INSUFFICIENT_BUFFER: errno.ENOMEM,
        winerror.ERROR_INVALID_ACCESS: errno.EACCES,
        winerror.ERROR_INVALID_ADDRESS: errno.EFAULT,
        winerror.ERROR_INVALID_BLOCK: errno.EFAULT,
        winerror.ERROR_INVALID_DATA: errno.EINVAL,
        winerror.ERROR_INVALID_DRIVE: errno.ENODEV,
        winerror.ERROR_INVALID_EXE_SIGNATURE: errno.ENOEXEC,
        winerror.ERROR_INVALID_FLAGS: errno.EINVAL,
        winerror.ERROR_INVALID_FUNCTION: errno.ENOSYS,
        winerror.ERROR_INVALID_HANDLE: errno.EBADF,
        winerror.ERROR_INVALID_LOGON_HOURS: errno.EACCES,
        winerror.ERROR_INVALID_NAME: errno.EINVAL,
        winerror.ERROR_INVALID_OWNER: errno.EINVAL,
        winerror.ERROR_INVALID_PARAMETER: errno.EINVAL,
        winerror.ERROR_INVALID_PASSWORD: errno.EPERM,
        winerror.ERROR_INVALID_PRIMARY_GROUP: errno.EINVAL,
        winerror.ERROR_INVALID_SIGNAL_NUMBER: errno.EINVAL,
        winerror.ERROR_INVALID_TARGET_HANDLE: errno.EIO,
        winerror.ERROR_INVALID_WORKSTATION: errno.EACCES,
        winerror.ERROR_IO_DEVICE: errno.EIO,
        winerror.ERROR_IO_INCOMPLETE: errno.EINTR,
        winerror.ERROR_LOCKED: errno.EBUSY,
        winerror.ERROR_LOCK_VIOLATION: errno.EACCES,
        winerror.ERROR_LOGON_FAILURE: errno.EACCES,
        winerror.ERROR_MAPPED_ALIGNMENT: errno.EINVAL,
        winerror.ERROR_META_EXPANSION_TOO_LONG: errno.E2BIG,
        winerror.ERROR_MORE_DATA: errno.EPIPE,
        winerror.ERROR_NEGATIVE_SEEK: errno.ESPIPE,
        winerror.ERROR_NOACCESS: errno.EFAULT,
        winerror.ERROR_NONE_MAPPED: errno.EINVAL,
        winerror.ERROR_NOT_ENOUGH_MEMORY: errno.ENOMEM,
        winerror.ERROR_NOT_READY: errno.EAGAIN,
        winerror.ERROR_NOT_SAME_DEVICE: errno.EXDEV,
        winerror.ERROR_NO_DATA: errno.EPIPE,
        winerror.ERROR_NO_MORE_SEARCH_HANDLES: errno.EIO,
        winerror.ERROR_NO_PROC_SLOTS: errno.EAGAIN,
        winerror.ERROR_NO_SUCH_PRIVILEGE: errno.EACCES,
        winerror.ERROR_OPEN_FAILED: errno.EIO,
        winerror.ERROR_OPEN_FILES: errno.EBUSY,
        winerror.ERROR_OPERATION_ABORTED: errno.EINTR,
        winerror.ERROR_OUTOFMEMORY: errno.ENOMEM,
        winerror.ERROR_PASSWORD_EXPIRED: errno.EACCES,
        winerror.ERROR_PATH_BUSY: errno.EBUSY,
        winerror.ERROR_PATH_NOT_FOUND: errno.ENOENT,
        winerror.ERROR_PIPE_BUSY: errno.EBUSY,
        winerror.ERROR_PIPE_CONNECTED: errno.EPIPE,
        winerror.ERROR_PIPE_LISTENING: errno.EPIPE,
        winerror.ERROR_PIPE_NOT_CONNECTED: errno.EPIPE,
        winerror.ERROR_PRIVILEGE_NOT_HELD: errno.EACCES,
        winerror.ERROR_READ_FAULT: errno.EIO,
        winerror.ERROR_SEEK: errno.EIO,
        winerror.ERROR_SEEK_ON_DEVICE: errno.ESPIPE,
        winerror.ERROR_SHARING_BUFFER_EXCEEDED: errno.ENFILE,
        winerror.ERROR_SHARING_VIOLATION: errno.EACCES,
        winerror.ERROR_STACK_OVERFLOW: errno.ENOMEM,
        winerror.ERROR_SWAPERROR: errno.ENOENT,
        winerror.ERROR_TOO_MANY_MODULES: errno.EMFILE,
        winerror.ERROR_TOO_MANY_OPEN_FILES: errno.EMFILE,
        winerror.ERROR_UNRECOGNIZED_MEDIA: errno.ENXIO,
        winerror.ERROR_UNRECOGNIZED_VOLUME: errno.ENODEV,
        winerror.ERROR_WAIT_NO_CHILDREN: errno.ECHILD,
        winerror.ERROR_WRITE_FAULT: errno.EIO,
        winerror.ERROR_WRITE_PROTECT: errno.EROFS,
        }

    def __init__(self, err):
        self.win_errno, self.win_function, self.win_strerror = err
        if self.win_strerror.endswith('.'):
            self.win_strerror = self.win_strerror[:-1]

class WinIOError(WinError, IOError):
    def __init__(self, err, filename=None):
        WinError.__init__(self, err)
        IOError.__init__(self, self.winerror_map.get(self.win_errno, 0),
                         self.win_strerror)
        self.filename = filename

class WinOSError(WinError, OSError):
    def __init__(self, err):
        WinError.__init__(self, err)
        OSError.__init__(self, self.winerror_map.get(self.win_errno, 0),
                         self.win_strerror)

def os_link(src, dst):
    try:
        win32file.CreateHardLink(dst, src)
        # CreateHardLink sometimes succeeds on mapped drives but
        # following nlinks() returns 1. Check it now and bail out.
        if nlinks(src) < 2:
            try:
                win32file.DeleteFile(dst)
            except:
                pass
            # Fake hardlinking error
            raise WinOSError((18, 'CreateHardLink', 'The system cannot '
                              'move the file to a different disk drive'))
    except pywintypes.error, details:
        raise WinOSError(details)

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:
        handle = win32api.OpenProcess(
            win32con.PROCESS_QUERY_INFORMATION, False, pid)
        if handle:
            status = win32process.GetExitCodeProcess(handle)
            return status == win32con.STILL_ACTIVE
    except pywintypes.error, details:
        return details[0] != winerror.ERROR_INVALID_PARAMETER
    return True

def lookup_reg(key, valname=None, scope=None):
    ''' Look up a key/value name in the Windows registry.

    valname: value name. If unspecified, the default value for the key
    is used.
    scope: optionally specify scope for registry lookup, this can be
    a sequence of scopes to look up in order. Default (CURRENT_USER,
    LOCAL_MACHINE).
    '''
    try:
        from _winreg import HKEY_CURRENT_USER, HKEY_LOCAL_MACHINE, \
            QueryValueEx, OpenKey
    except ImportError:
        return None

    if scope is None:
        scope = (HKEY_CURRENT_USER, HKEY_LOCAL_MACHINE)
    elif not isinstance(scope, (list, tuple)):
        scope = (scope,)
    for s in scope:
        try:
            val = QueryValueEx(OpenKey(s, key), valname)[0]
            # never let a Unicode string escape into the wild
            return util.tolocal(val.encode('UTF-8'))
        except EnvironmentError:
            pass

def system_rcpath_win32():
    '''return default os-specific hgrc search path'''
    proc = win32api.GetCurrentProcess()
    try:
        # This will fail on windows < NT
        filename = win32process.GetModuleFileNameEx(proc, 0)
    except:
        filename = win32api.GetModuleFileName(0)
    # Use mercurial.ini found in directory with hg.exe
    progrc = os.path.join(os.path.dirname(filename), 'mercurial.ini')
    if os.path.isfile(progrc):
        return [progrc]
    # else look for a system rcpath in the registry
    try:
        value = win32api.RegQueryValue(
                win32con.HKEY_LOCAL_MACHINE, 'SOFTWARE\\Mercurial')
        rcpath = []
        for p in value.split(os.pathsep):
            if p.lower().endswith('mercurial.ini'):
                rcpath.append(p)
            elif os.path.isdir(p):
                for f, kind in osutil.listdir(p):
                    if f.endswith('.rc'):
                        rcpath.append(os.path.join(p, f))
        return rcpath
    except pywintypes.error:
        return []

def user_rcpath_win32():
    '''return os-specific hgrc search path to the user dir'''
    userdir = os.path.expanduser('~')
    if sys.getwindowsversion() != 2 and userdir == '~':
        # We are on win < nt: fetch the APPDATA directory location and use
        # the parent directory as the user home dir.
        appdir = shell.SHGetPathFromIDList(
            shell.SHGetSpecialFolderLocation(0, shellcon.CSIDL_APPDATA))
        userdir = os.path.dirname(appdir)
    return [os.path.join(userdir, 'mercurial.ini'),
            os.path.join(userdir, '.hgrc')]

class posixfile_nt(object):
    '''file object with posix-like semantics.  on windows, normal
    files can not be deleted or renamed if they are open. must open
    with win32file.FILE_SHARE_DELETE. this flag does not exist on
    windows < nt, so do not use this class there.'''

    # tried to use win32file._open_osfhandle to pass fd to os.fdopen,
    # but does not work at all. wrap win32 file api instead.

    def __init__(self, name, mode='rb'):
        self.closed = False
        self.name = name
        self.mode = mode
        access = 0
        if 'r' in mode or '+' in mode:
            access |= win32file.GENERIC_READ
        if 'w' in mode or 'a' in mode or '+' in mode:
            access |= win32file.GENERIC_WRITE
        if 'r' in mode:
            creation = win32file.OPEN_EXISTING
        elif 'a' in mode:
            creation = win32file.OPEN_ALWAYS
        else:
            creation = win32file.CREATE_ALWAYS
        try:
            self.handle = win32file.CreateFile(name,
                                               access,
                                               win32file.FILE_SHARE_READ |
                                               win32file.FILE_SHARE_WRITE |
                                               win32file.FILE_SHARE_DELETE,
                                               None,
                                               creation,
                                               win32file.FILE_ATTRIBUTE_NORMAL,
                                               0)
        except pywintypes.error, err:
            raise WinIOError(err, name)

    def __iter__(self):
        for line in self.read().splitlines(True):
            yield line

    def read(self, count=-1):
        try:
            cs = cStringIO.StringIO()
            while count:
                wincount = int(count)
                if wincount == -1:
                    wincount = 1048576
                val, data = win32file.ReadFile(self.handle, wincount)
                if not data: break
                cs.write(data)
                if count != -1:
                    count -= len(data)
            return cs.getvalue()
        except pywintypes.error, err:
            raise WinIOError(err)

    def write(self, data):
        try:
            if 'a' in self.mode:
                win32file.SetFilePointer(self.handle, 0, win32file.FILE_END)
            nwrit = 0
            while nwrit < len(data):
                val, nwrit = win32file.WriteFile(self.handle, data)
                data = data[nwrit:]
        except pywintypes.error, err:
            raise WinIOError(err)

    def writelines(self, sequence):
        for s in sequence:
            self.write(s)

    def seek(self, pos, whence=0):
        try:
            win32file.SetFilePointer(self.handle, int(pos), whence)
        except pywintypes.error, err:
            raise WinIOError(err)

    def tell(self):
        try:
            return win32file.SetFilePointer(self.handle, 0,
                                            win32file.FILE_CURRENT)
        except pywintypes.error, err:
            raise WinIOError(err)

    def close(self):
        if not self.closed:
            self.handle = None
            self.closed = True

    def flush(self):
        # we have no application-level buffering
        pass

    def truncate(self, pos=0):
        try:
            win32file.SetFilePointer(self.handle, int(pos),
                                     win32file.FILE_BEGIN)
            win32file.SetEndOfFile(self.handle)
        except pywintypes.error, err:
            raise WinIOError(err)

getuser_fallback = win32api.GetUserName

def set_signal_handler_win32():
    """Register a termination handler for console events including
    CTRL+C. python signal handlers do not work well with socket
    operations.
    """
    def handler(event):
        win32process.ExitProcess(1)
    win32api.SetConsoleCtrlHandler(handler)