view mercurial/util_win32.py @ 4310:c8919eb0f315

purge: abort with missing files avoiding problems with name-mangling fs

In a name mangling filesystem (e.g. a case insensitive one)
dirstate.walk() can yield filenames different from the ones
stored in the dirstate. This already confuses the status and
add commands, but with purge this may cause data loss.

To prevent this purge refuses to work if there are missing
files and has a 'force' option if the user knows it is safe.

Even with the force option purge checks if any of the missing
files is still available in the working dir: if so there
may be some problem with the underlying filesystem, so it
unconditionally aborts.

# 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

from i18n import _
import errno, os, pywintypes, win32con, win32file, win32process
import cStringIO, winerror
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):
    # NB will only succeed on NTFS
    try:
        win32file.CreateHardLink(dst, src)
    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 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)
    return [os.path.join(os.path.dirname(filename), 'mercurial.ini')]

def user_rcpath_win32():
    '''return os-specific hgrc search path to the user dir'''
    userdir = os.path.expanduser('~')
    if 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')

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'):
        access = 0
        if 'r' in mode or '+' in mode:
            access |= win32file.GENERIC_READ
        if 'w' in mode or 'a' 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)
        self.closed = False
        self.name = name
        self.mode = mode

    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 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):
        try:
            win32file.FlushFileBuffers(self.handle)
        except pywintypes.error, err:
            raise WinIOError(err)

    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