annotate mercurial/windows.py @ 8364:fa901423ac23

windows: avoid deleting non-empty reparse points

If a hg repository including working directory is a reparse point (directory
symlinked or a junction point), then using os.removedirs will remove the
reparse point erroneously. This is fixed by only removing directories if they
are empty.

# windows.py - Windows utility function implementations for Mercurial
#
#  Copyright 2005-2009 Matt Mackall <[e-mail]> and others
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2, incorporated herein by reference.

from i18n import _
import osutil, error
import errno, msvcrt, os, re, sys
nulldev = 'NUL:'

umask = 002

class winstdout:
    '''stdout on windows misbehaves if sent through a pipe'''

    def __init__(self, fp):
        self.fp = fp

    def __getattr__(self, key):
        return getattr(self.fp, key)

    def close(self):
        try:
            self.fp.close()
        except: pass

    def write(self, s):
        try:
            # This is workaround for "Not enough space" error on
            # writing large size of data to console.
            limit = 16000
            l = len(s)
            start = 0
            while start < l:
                end = start + limit
                self.fp.write(s[start:end])
                start = end
        except IOError, inst:
            if inst.errno != 0: raise
            self.close()
            raise IOError(errno.EPIPE, 'Broken pipe')

    def flush(self):
        try:
            return self.fp.flush()
        except IOError, inst:
            if inst.errno != errno.EINVAL: raise
            self.close()
            raise IOError(errno.EPIPE, 'Broken pipe')

sys.stdout = winstdout(sys.stdout)

def _is_win_9x():
    '''return true if run on windows 95, 98 or me.'''
    try:
        return sys.getwindowsversion()[3] == 1
    except AttributeError:
        return 'command' in os.environ.get('comspec', '')

def openhardlinks():
    return not _is_win_9x and "win32api" in locals()

def system_rcpath():
    try:
        return system_rcpath_win32()
    except:
        return [r'c:\mercurial\mercurial.ini']

def user_rcpath():
    '''return os-specific hgrc search path to the user dir'''
    try:
        path = user_rcpath_win32()
    except:
        home = os.path.expanduser('~')
        path = [os.path.join(home, 'mercurial.ini'),
                os.path.join(home, '.hgrc')]
    userprofile = os.environ.get('USERPROFILE')
    if userprofile:
        path.append(os.path.join(userprofile, 'mercurial.ini'))
        path.append(os.path.join(userprofile, '.hgrc'))
    return path

def parse_patch_output(output_line):
    """parses the output produced by patch and returns the file name"""
    pf = output_line[14:]
    if pf[0] == '`':
        pf = pf[1:-1] # Remove the quotes
    return pf

def sshargs(sshcmd, host, user, port):
    '''Build argument list for ssh or Plink'''
    pflag = 'plink' in sshcmd.lower() and '-P' or '-p'
    args = user and ("%s@%s" % (user, host)) or host
    return port and ("%s %s %s" % (args, pflag, port)) or args

def testpid(pid):
    '''return False if pid dead, True if running or not known'''
    return True

def set_flags(f, l, x):
    pass

def set_binary(fd):
    # When run without console, pipes may expose invalid
    # fileno(), usually set to -1.
    if hasattr(fd, 'fileno') and fd.fileno() >= 0:
        msvcrt.setmode(fd.fileno(), os.O_BINARY)

def pconvert(path):
    return '/'.join(path.split(os.sep))

def localpath(path):
    return path.replace('/', '\\')

def normpath(path):
    return pconvert(os.path.normpath(path))

def samestat(s1, s2):
    return False

# A sequence of backslashes is special iff it precedes a double quote:
# - if there's an even number of backslashes, the double quote is not
#   quoted (i.e. it ends the quoted region)
# - if there's an odd number of backslashes, the double quote is quoted
# - in both cases, every pair of backslashes is unquoted into a single
#   backslash
# (See http://msdn2.microsoft.com/en-us/library/a1y7w461.aspx )
# So, to quote a string, we must surround it in double quotes, double
# the number of backslashes that preceed double quotes and add another
# backslash before every double quote (being careful with the double
# quote we've appended to the end)
_quotere = None
def shellquote(s):
    global _quotere
    if _quotere is None:
        _quotere = re.compile(r'(\\*)("|\\$)')
    return '"%s"' % _quotere.sub(r'\1\1\\\2', s)

def quotecommand(cmd):
    """Build a command string suitable for os.popen* calls."""
    # The extra quotes are needed because popen* runs the command
    # through the current COMSPEC. cmd.exe suppress enclosing quotes.
    return '"' + cmd + '"'

def popen(command, mode='r'):
    # Work around "popen spawned process may not write to stdout
    # under windows"
    # http://bugs.python.org/issue1366
    command += " 2> %s" % nulldev
    return os.popen(quotecommand(command), mode)

def explain_exit(code):
    return _("exited with status %d") % code, code

# if you change this stub into a real check, please try to implement the
# username and groupname functions above, too.
def isowner(fp, st=None):
    return True

def find_exe(command):
    '''Find executable for command searching like cmd.exe does.
    If command is a basename then PATH is searched for command.
    PATH isn't searched if command is an absolute or relative path.
    An extension from PATHEXT is found and added if not present.
    If command isn't found None is returned.'''
    pathext = os.environ.get('PATHEXT', '.COM;.EXE;.BAT;.CMD')
    pathexts = [ext for ext in pathext.lower().split(os.pathsep)]
    if os.path.splitext(command)[1].lower() in pathexts:
        pathexts = ['']

    def findexisting(pathcommand):
        'Will append extension (if needed) and return existing file'
        for ext in pathexts:
            executable = pathcommand + ext
            if os.path.exists(executable):
                return executable
        return None

    if os.sep in command:
        return findexisting(command)

    for path in os.environ.get('PATH', '').split(os.pathsep):
        executable = findexisting(os.path.join(path, command))
        if executable is not None:
            return executable
    return None

def set_signal_handler():
    try:
        set_signal_handler_win32()
    except NameError:
        pass

def statfiles(files):
    '''Stat each file in files and yield stat or None if file does not exist.
    Cluster and cache stat per directory to minimize number of OS stat calls.'''
    ncase = os.path.normcase
    sep   = os.sep
    dircache = {} # dirname -> filename -> status | None if file does not exist
    for nf in files:
        nf  = ncase(nf)
        pos = nf.rfind(sep)
        if pos == -1:
            dir, base = '.', nf
        else:
            dir, base = nf[:pos+1], nf[pos+1:]
        cache = dircache.get(dir, None)
        if cache is None:
            try:
                dmap = dict([(ncase(n), s)
                    for n, k, s in osutil.listdir(dir, True)])
            except OSError, err:
                # handle directory not found in Python version prior to 2.5
                # Python <= 2.4 returns native Windows code 3 in errno
                # Python >= 2.5 returns ENOENT and adds winerror field
                # EINVAL is raised if dir is not a directory.
                if err.errno not in (3, errno.ENOENT, errno.EINVAL,
                                     errno.ENOTDIR):
                    raise
                dmap = {}
            cache = dircache.setdefault(dir, dmap)
        yield cache.get(base, None)

def getuser():
    '''return name of current user'''
    raise error.Abort(_('user name not available - set USERNAME '
                       'environment variable'))

def username(uid=None):
    """Return the name of the user with the given uid.

    If uid is None, return the name of the current user."""
    return None

def groupname(gid=None):
    """Return the name of the group with the given gid.

    If gid is None, return the name of the current group."""
    return None

def _removedirs(name):
    """special version of os.removedirs that does not remove symlinked
    directories or junction points if they actually contain files"""
    if osutil.listdir(name):
        return
    os.rmdir(name)
    head, tail = os.path.split(name)
    if not tail:
        head, tail = os.path.split(head)
    while head and tail:
        try:
            if osutil.listdir(name):
                return
            os.rmdir(head)
        except:
            break
        head, tail = os.path.split(head)

def unlink(f):
    """unlink and remove the directory if it is empty"""
    os.unlink(f)
    # try removing directories that might now be empty
    try:
        _removedirs(os.path.dirname(f))
    except OSError:
        pass

try:
    # override functions with win32 versions if possible
    from win32 import *
    if not _is_win_9x():
        posixfile = posixfile_nt
        try:
            # fast, buffered POSIX-like file support
            from osutil import posixfile as _posixfile
            def posixfile(name, mode='r', buffering=-1):
                # wrap osutil.posixfile to provide friendlier exceptions
                try:
                    return _posixfile(name, mode, buffering)
                except WindowsError, err:
                    raise WinIOError(err)
            posixfile.__doc__ = _posixfile.__doc__
        except ImportError:
            # slow, unbuffered POSIX-like file support
            posixfile = posixfile_nt
except ImportError:
    posixfile = file