#!/usr/bin/env python3

#script to launch Wine with the correct environment

import fcntl
import array
import filecmp
import fnmatch
import json
import os
import shutil
import errno
import stat
import subprocess
import sys
import tarfile

from filelock import FileLock

#To enable debug logging, copy "user_settings.sample.py" to "user_settings.py"
#and edit it if needed.

CURRENT_PREFIX_VERSION="5.13-1"

PFX="Proton: "
ld_path_var = "LD_LIBRARY_PATH"

def nonzero(s):
    return len(s) > 0 and s != "0"

def prepend_to_env_str(env, variable, prepend_str, separator):
    if not variable in env:
        env[variable] = prepend_str
    else:
        env[variable] = prepend_str + separator + env[variable]

def append_to_env_str(env, variable, append_str, separator):
    if not variable in env:
        env[variable] = append_str
    else:
        env[variable] = env[variable] + separator + append_str

def log(msg):
    sys.stderr.write(PFX + msg + os.linesep)
    sys.stderr.flush()

def file_is_wine_builtin_dll(path):
    if os.path.islink(path):
        contents = os.readlink(path)
        if os.path.dirname(contents).endswith(('/lib/wine', '/lib/wine/fakedlls', '/lib64/wine', '/lib64/wine/fakedlls')):
            # This may be a broken link to a dll in a removed Proton install
            return True
    if not os.path.exists(path):
        return False
    try:
        sfile = open(path, "rb")
        sfile.seek(0x40)
        tag = sfile.read(20)
        return tag.startswith((b"Wine placeholder DLL", b"Wine builtin DLL"))
    except IOError:
        return False

def makedirs(path):
    try:
        os.makedirs(path)
    except OSError:
        #already exists
        pass

def try_copy(src, dst, add_write_perm=True):
    try:
        if os.path.isdir(dst):
            dstfile = dst + "/" + os.path.basename(src)
            if os.path.lexists(dstfile):
                os.remove(dstfile)
        else:
            dstfile = dst
            if os.path.lexists(dst):
                os.remove(dst)

        shutil.copy(src, dst)

        if add_write_perm:
            new_mode = os.lstat(dstfile).st_mode | stat.S_IWUSR | stat.S_IWGRP
            os.chmod(dstfile, new_mode)

    except PermissionError as e:
        if e.errno == errno.EPERM:
            #be forgiving about permissions errors; if it's a real problem, things will explode later anyway
            log('Error while copying to \"' + dst + '\": ' + e.strerror)
        else:
            raise

def try_copyfile(src, dst):
    try:
        if os.path.isdir(dst):
            dstfile = dst + "/" + os.path.basename(src)
            if os.path.lexists(dstfile):
                os.remove(dstfile)
        elif os.path.lexists(dst):
            os.remove(dst)
        shutil.copyfile(src, dst)
    except PermissionError as e:
        if e.errno == errno.EPERM:
            #be forgiving about permissions errors; if it's a real problem, things will explode later anyway
            log('Error while copying to \"' + dst + '\": ' + e.strerror)
        else:
            raise

def getmtimestr(*path_fragments):
    path = os.path.join(*path_fragments)
    try:
        return str(os.path.getmtime(path))
    except IOError:
        return "0"

def try_get_game_library_dir():
    if not "STEAM_COMPAT_INSTALL_PATH" in g_session.env or \
            not "STEAM_COMPAT_LIBRARY_PATHS" in g_session.env:
        return None

    #find library path which is a subset of the game path
    library_paths = g_session.env["STEAM_COMPAT_LIBRARY_PATHS"].split(":")
    for l in library_paths:
        if l in g_session.env["STEAM_COMPAT_INSTALL_PATH"]:
            return l

    return None

EXT2_IOC_GETFLAGS = 0x80086601
EXT2_IOC_SETFLAGS = 0x40086602

EXT4_CASEFOLD_FL = 0x40000000

def set_dir_casefold_bit(dir_path):
    dr = os.open(dir_path, 0o644)
    if dr < 0:
        return
    try:
        dat = array.array('I', [0])
        if fcntl.ioctl(dr, EXT2_IOC_GETFLAGS, dat, True) >= 0:
            dat[0] = dat[0] | EXT4_CASEFOLD_FL
            fcntl.ioctl(dr, EXT2_IOC_SETFLAGS, dat, False)
    except (OSError, IOError):
        #no problem
        pass
    os.close(dr)

class Proton:
    def __init__(self, base_dir):
        self.base_dir = base_dir + "/"
        self.dist_dir = self.path("dist/")
        self.bin_dir = self.path("dist/bin/")
        self.lib_dir = self.path("dist/lib/")
        self.lib64_dir = self.path("dist/lib64/")
        self.fonts_dir = self.path("dist/share/fonts/")
        self.version_file = self.path("version")
        self.default_pfx_dir = self.path("dist/share/default_pfx/")
        self.user_settings_file = self.path("user_settings.py")
        self.wine_bin = self.bin_dir + "wine"
        self.wineserver_bin = self.bin_dir + "wineserver"
        self.dist_lock = FileLock(self.path("dist.lock"), timeout=-1)

    def path(self, d):
        return self.base_dir + d

    def need_tarball_extraction(self):
        '''Checks if the proton_dist tarball archive must be extracted. Returns true if extraction is needed, false otherwise'''
        return not os.path.exists(self.dist_dir) or \
            not os.path.exists(self.path("dist/version")) or \
            not filecmp.cmp(self.version_file, self.path("dist/version"))

    def extract_tarball(self):
        with self.dist_lock:
            if self.need_tarball_extraction():
                if os.path.exists(self.dist_dir):
                    shutil.rmtree(self.dist_dir)
                tar = None
                for sf in ["", ".xz", ".bz2", ".gz"]:
                    if os.path.exists(self.path("proton_dist.tar" + sf)):
                        tar = tarfile.open(self.path("proton_dist.tar" + sf), mode="r:*")
                        break
                if not tar:
                    log("No proton_dist tarball??")
                    sys.exit(1)
                tar.extractall(path=self.dist_dir)
                tar.close()
                try_copy(self.version_file, self.dist_dir)

    def missing_default_prefix(self):
        '''Check if the default prefix dir is missing. Returns true if missing, false if present'''
        return not os.path.isdir(self.default_pfx_dir)

    def make_default_prefix(self):
        with self.dist_lock:
            local_env = dict(g_session.env)
            if self.missing_default_prefix():
                #make default prefix
                local_env["WINEPREFIX"] = self.default_pfx_dir
                local_env["WINEDEBUG"] = "-all"
                g_session.run_proc([self.wine_bin, "wineboot"], local_env)
                g_session.run_proc([self.wineserver_bin, "-w"], local_env)

class CompatData:
    def __init__(self, compatdata):
        self.base_dir = compatdata + "/"
        self.prefix_dir = self.path("pfx/")
        self.version_file = self.path("version")
        self.config_info_file = self.path("config_info")
        self.tracked_files_file = self.path("tracked_files")
        self.prefix_lock = FileLock(self.path("pfx.lock"), timeout=-1)

    def path(self, d):
        return self.base_dir + d

    def remove_tracked_files(self):
        if not os.path.exists(self.tracked_files_file):
            log("Prefix has no tracked_files??")
            return

        with open(self.tracked_files_file, "r") as tracked_files:
            dirs = []
            for f in tracked_files:
                path = self.prefix_dir + f.strip()
                if os.path.exists(path):
                    if os.path.isfile(path) or os.path.islink(path):
                        os.remove(path)
                    else:
                        dirs.append(path)
            for d in dirs:
                try:
                    os.rmdir(d)
                except OSError:
                    #not empty
                    pass

        os.remove(self.tracked_files_file)
        os.remove(self.version_file)

    def upgrade_pfx(self, old_ver):
        if old_ver == CURRENT_PREFIX_VERSION:
            return

        log("Upgrading prefix from " + str(old_ver) + " to " + CURRENT_PREFIX_VERSION + " (" + self.base_dir + ")")

        if old_ver is None:
            return

        if not '-' in old_ver:
            #How can this happen??
            log("Prefix has an invalid version?! You may want to back up user files and delete this prefix.")
            #If it does, just let the Wine upgrade happen and hope it works...
            return

        try:
            old_proton_ver, old_prefix_ver = old_ver.split('-')
            old_proton_maj, old_proton_min = old_proton_ver.split('.')
            new_proton_ver, new_prefix_ver = CURRENT_PREFIX_VERSION.split('-')
            new_proton_maj, new_proton_min = new_proton_ver.split('.')

            if int(new_proton_maj) < int(old_proton_maj) or \
                    (int(new_proton_maj) == int(old_proton_maj) and \
                     int(new_proton_min) < int(old_proton_min)):
                log("Removing newer prefix")
                if old_proton_ver == "3.7" and not os.path.exists(self.tracked_files_file):
                    #proton 3.7 did not generate tracked_files, so copy it into place first
                    try_copy(g_proton.path("proton_3.7_tracked_files"), self.tracked_files_file)
                self.remove_tracked_files()
                return

            if old_proton_ver == "3.7" and old_prefix_ver == "1":
                if not os.path.exists(self.prefix_dir + "/drive_c/windows/syswow64/kernel32.dll"):
                    #shipped a busted 64-bit-only installation on 20180822. detect and wipe clean
                    log("Detected broken 64-bit-only installation, re-creating prefix.")
                    shutil.rmtree(self.prefix_dir)
                    return

            #replace broken .NET installations with wine-mono support
            if os.path.exists(self.prefix_dir + "/drive_c/windows/Microsoft.NET/NETFXRepair.exe") and \
                    file_is_wine_builtin_dll(self.prefix_dir + "/drive_c/windows/system32/mscoree.dll"):
                log("Broken .NET installation detected, switching to wine-mono.")
                #deleting this directory allows wine-mono to work
                shutil.rmtree(self.prefix_dir + "/drive_c/windows/Microsoft.NET")

            #prior to prefix version 4.11-2, all controllers were xbox controllers. wipe out the old registry entries.
            if (int(old_proton_maj) < 4 or (int(old_proton_maj) == 4 and int(old_proton_min) == 11)) and \
                    int(old_prefix_ver) < 2:
                log("Removing old xinput registry entries.")
                with open(self.prefix_dir + "system.reg", "r") as reg_in:
                    with open(self.prefix_dir + "system.reg.new", "w") as reg_out:
                        for line in reg_in:
                            if line[0] == '[' and "CurrentControlSet" in line and "IG_" in line:
                                if "DeviceClasses" in line:
                                    reg_out.write(line.replace("DeviceClasses", "DeviceClasses_old"))
                                elif "Enum" in line:
                                    reg_out.write(line.replace("Enum", "Enum_old"))
                            else:
                                reg_out.write(line)
                try:
                    os.rename(self.prefix_dir + "system.reg", self.prefix_dir + "system.reg.old")
                except OSError:
                    os.remove(self.prefix_dir + "system.reg")
                    pass

                try:
                    os.rename(self.prefix_dir + "system.reg.new", self.prefix_dir + "system.reg")
                except OSError:
                    log("Unable to write new registry file to " + self.prefix_dir + "system.reg")
                    pass

        except ValueError:
            log("Prefix has an invalid version?! You may want to back up user files and delete this prefix.")
            #Just let the Wine upgrade happen and hope it works...
            return

    def pfx_copy(self, src, dst, dll_copy=False):
        if os.path.islink(src):
            contents = os.readlink(src)
            if os.path.dirname(contents).endswith(('/lib/wine', '/lib/wine/fakedlls', '/lib64/wine', '/lib64/wine/fakedlls')):
                # wine builtin dll
                # make the destination an absolute symlink
                contents = os.path.normpath(os.path.join(os.path.dirname(src), contents))
            if dll_copy:
                try_copyfile(src, dst)
            else:
                os.symlink(contents, dst)
        else:
            try_copyfile(src, dst)

    def copy_pfx(self):
        with open(self.tracked_files_file, "w") as tracked_files:
            for src_dir, dirs, files in os.walk(g_proton.default_pfx_dir):
                rel_dir = src_dir.replace(g_proton.default_pfx_dir, "", 1).lstrip('/')
                if len(rel_dir) > 0:
                    rel_dir = rel_dir + "/"
                dst_dir = src_dir.replace(g_proton.default_pfx_dir, self.prefix_dir, 1)
                if not os.path.exists(dst_dir):
                    os.makedirs(dst_dir)
                    tracked_files.write(rel_dir + "\n")
                for dir_ in dirs:
                    src_file = os.path.join(src_dir, dir_)
                    dst_file = os.path.join(dst_dir, dir_)
                    if os.path.islink(src_file) and not os.path.exists(dst_file):
                        self.pfx_copy(src_file, dst_file)
                for file_ in files:
                    src_file = os.path.join(src_dir, file_)
                    dst_file = os.path.join(dst_dir, file_)
                    if not os.path.exists(dst_file):
                        self.pfx_copy(src_file, dst_file)
                        tracked_files.write(rel_dir + file_ + "\n")

    def update_builtin_libs(self, dll_copy_patterns):
        dll_copy_patterns = dll_copy_patterns.split(',')
        prev_tracked_files = set()
        with open(self.tracked_files_file, "r") as tracked_files:
            for line in tracked_files:
                prev_tracked_files.add(line.strip())
        with open(self.tracked_files_file, "a") as tracked_files:
            for src_dir, dirs, files in os.walk(g_proton.default_pfx_dir):
                rel_dir = src_dir.replace(g_proton.default_pfx_dir, "", 1).lstrip('/')
                if len(rel_dir) > 0:
                    rel_dir = rel_dir + "/"
                dst_dir = src_dir.replace(g_proton.default_pfx_dir, self.prefix_dir, 1)
                if not os.path.exists(dst_dir):
                    os.makedirs(dst_dir)
                    tracked_files.write(rel_dir + "\n")
                for file_ in files:
                    src_file = os.path.join(src_dir, file_)
                    dst_file = os.path.join(dst_dir, file_)
                    if not file_is_wine_builtin_dll(src_file):
                        # Not a builtin library
                        continue
                    if file_is_wine_builtin_dll(dst_file):
                        os.unlink(dst_file)
                    elif os.path.lexists(dst_file):
                        # builtin library was replaced
                        continue
                    else:
                        os.makedirs(dst_dir, exist_ok=True)
                    dll_copy = any(fnmatch.fnmatch(file_, pattern) for pattern in dll_copy_patterns)
                    self.pfx_copy(src_file, dst_file, dll_copy)
                    tracked_name = rel_dir + file_
                    if tracked_name not in prev_tracked_files:
                        tracked_files.write(tracked_name + "\n")

    def create_fonts_symlinks(self):
        fontsmap = [
            ( "LiberationSans-Regular.ttf", "arial.ttf" ),
            ( "LiberationSans-Bold.ttf", "arialbd.ttf" ),
            ( "LiberationSerif-Regular.ttf", "times.ttf" ),
            ( "LiberationMono-Regular.ttf", "cour.ttf" ),
            ( "SourceHanSansSCRegular.otf", "msyh.ttf" ),
        ]

        windowsfonts = self.prefix_dir + "/drive_c/windows/Fonts"
        makedirs(windowsfonts)
        for p in fontsmap:
            lname = os.path.join(windowsfonts, p[1])
            fname = os.path.join(g_proton.fonts_dir, p[0])
            if os.path.lexists(lname):
                if os.path.islink(lname):
                    os.remove(lname)
                    os.symlink(fname, lname)
            else:
                os.symlink(fname, lname)

    def setup_prefix(self):
        with self.prefix_lock:
            if os.path.exists(self.version_file):
                with open(self.version_file, "r") as f:
                    old_ver = f.readline().strip()
            else:
                old_ver = None

            self.upgrade_pfx(old_ver)

            if not os.path.exists(self.prefix_dir):
                makedirs(self.prefix_dir + "/drive_c")
                set_dir_casefold_bit(self.prefix_dir + "/drive_c")

            if not os.path.exists(self.prefix_dir + "/user.reg"):
                self.copy_pfx()

            # collect configuration info
            if "STEAM_COMPAT_CLIENT_INSTALL_PATH" in os.environ:
                #modern steam client sets this
                steamdir = os.environ["STEAM_COMPAT_CLIENT_INSTALL_PATH"]
            else:
                #linux-only fallback, really shouldn't get here
                steamdir = os.environ["HOME"] + ".steam/root/"

            use_wined3d = "wined3d" in g_session.compat_config
            use_dxvk_dxgi = "WINEDLLOVERRIDES" in g_session.env and "dxgi=n" in g_session.env["WINEDLLOVERRIDES"]

            builtin_dll_copy = os.environ.get("PROTON_DLL_COPY",
                    #dxsetup redist
                    "d3dcompiler_*.dll," +
                    "d3dcsx*.dll," +
                    "d3dx*.dll," +
                    "x3daudio*.dll," +
                    "xactengine*.dll," +
                    "xapofx*.dll," +
                    "xaudio*.dll," +
                    "xinput*.dll," +

                    #vcruntime redist
                    "atl1*.dll," +
                    "concrt1*.dll," +
                    "msvcp1*.dll," +
                    "msvcr1*.dll," +
                    "vcamp1*.dll," +
                    "vcomp1*.dll," +
                    "vccorlib1*.dll," +
                    "vcruntime1*.dll," +

                    #some games balk at ntdll symlink(?)
                    "ntdll.dll," +

                    #some games require official vulkan loader
                    "vulkan-1.dll"
                    )

            # If any of this info changes, we must rerun the tasks below
            prefix_info = '\n'.join((
                CURRENT_PREFIX_VERSION,
                g_proton.fonts_dir,
                g_proton.lib_dir,
                g_proton.lib64_dir,
                steamdir,
                getmtimestr(steamdir, 'legacycompat', 'steamclient.dll'),
                getmtimestr(steamdir, 'legacycompat', 'steamclient64.dll'),
                getmtimestr(steamdir, 'legacycompat', 'Steam.dll'),
                g_proton.default_pfx_dir,
                getmtimestr(g_proton.default_pfx_dir, 'system.reg'),
                str(use_wined3d),
                str(use_dxvk_dxgi),
                builtin_dll_copy,
            ))

            if old_ver == CURRENT_PREFIX_VERSION:
                # check whether any prefix config has changed
                try:
                    with open(self.config_info_file, "r") as f:
                        old_prefix_info = f.read()
                except IOError:
                    old_prefix_info = ""

                if old_prefix_info != prefix_info:
                    # update builtin dll symlinks or copies
                    self.update_builtin_libs(builtin_dll_copy)

                    with open(self.config_info_file, "w") as f:
                        f.write(prefix_info)

            with open(self.version_file, "w") as f:
                f.write(CURRENT_PREFIX_VERSION + "\n")

            #create font files symlinks
            self.create_fonts_symlinks()

            with open(self.tracked_files_file, "a") as tracked_files:
                #copy steam files into place
                steam_dir = "drive_c/Program Files (x86)/Steam/"
                dst = self.prefix_dir + steam_dir
                makedirs(dst)
                filestocopy = [("steamclient.dll", "steamclient.dll"),
                               ("steamclient64.dll", "steamclient64.dll"),
                               ("GameOverlayRenderer64.dll", "GameOverlayRenderer64.dll"),
                               ("SteamService.exe", "steam.exe"),
                               ("Steam.dll", "Steam.dll")]
                for (src,tgt) in filestocopy:
                    srcfile = steamdir + '/legacycompat/' + src
                    if os.path.isfile(srcfile):
                        dstfile = dst + tgt
                        if os.path.isfile(dstfile):
                            os.remove(dstfile)
                        else:
                            tracked_files.write(steam_dir + tgt + "\n")
                        try_copy(srcfile, dstfile)

                filestocopy = [("steamclient64.dll", "steamclient64.dll"),
                               ("GameOverlayRenderer.dll", "GameOverlayRenderer.dll"),
                               ("GameOverlayRenderer64.dll", "GameOverlayRenderer64.dll")]
                for (src,tgt) in filestocopy:
                    srcfile = g_proton.path(src)
                    if os.path.isfile(srcfile):
                        dstfile = dst + tgt
                        if os.path.isfile(dstfile):
                            os.remove(dstfile)
                        else:
                            tracked_files.write(steam_dir + tgt + "\n")
                        try_copy(srcfile, dstfile)

            #copy openvr files into place
            dst = self.prefix_dir + "/drive_c/vrclient/bin/"
            makedirs(dst)
            try_copy(g_proton.lib_dir + "wine/fakedlls/vrclient.dll", dst)
            try_copy(g_proton.lib64_dir + "wine/fakedlls/vrclient_x64.dll", dst)

            try_copy(g_proton.lib_dir + "wine/dxvk/openvr_api_dxvk.dll", self.prefix_dir + "/drive_c/windows/syswow64/")
            try_copy(g_proton.lib64_dir + "wine/dxvk/openvr_api_dxvk.dll", self.prefix_dir + "/drive_c/windows/system32/")

            makedirs(self.prefix_dir + "/drive_c/openxr/")
            try_copy(g_proton.default_pfx_dir + "drive_c/openxr/wineopenxr64.json", self.prefix_dir + "/drive_c/openxr/")

            if use_wined3d:
                dxvkfiles = ["dxvk_config"]
                wined3dfiles = ["d3d11", "d3d10", "d3d10core", "d3d10_1", "d3d9"]
            else:
                dxvkfiles = ["dxvk_config", "d3d11", "d3d10", "d3d10core", "d3d10_1", "d3d9"]
                wined3dfiles = []

            #if the user asked for dxvk's dxgi (dxgi=n), then copy it into place
            if use_dxvk_dxgi:
                dxvkfiles.append("dxgi")
            else:
                wined3dfiles.append("dxgi")

            for f in wined3dfiles:
                try_copy(g_proton.default_pfx_dir + "drive_c/windows/system32/" + f + ".dll",
                        self.prefix_dir + "drive_c/windows/system32/" + f + ".dll")
                try_copy(g_proton.default_pfx_dir + "drive_c/windows/syswow64/" + f + ".dll",
                        self.prefix_dir + "drive_c/windows/syswow64/" + f + ".dll")

            for f in dxvkfiles:
                try_copy(g_proton.lib64_dir + "wine/dxvk/" + f + ".dll",
                        self.prefix_dir + "drive_c/windows/system32/" + f + ".dll")
                try_copy(g_proton.lib_dir + "wine/dxvk/" + f + ".dll",
                        self.prefix_dir + "drive_c/windows/syswow64/" + f + ".dll")
                g_session.dlloverrides[f] = "n"

            try_copy(g_proton.lib64_dir + "wine/vkd3d-proton/d3d12.dll",
                    self.prefix_dir + "drive_c/windows/system32/d3d12.dll")
            try_copy(g_proton.lib_dir + "wine/vkd3d-proton/d3d12.dll",
                    self.prefix_dir + "drive_c/windows/syswow64/d3d12.dll")

            gamedrive_path = self.prefix_dir + "dosdevices/s:"
            if "gamedrive" in g_session.compat_config:
                library_dir = try_get_game_library_dir()
                if not library_dir:
                    if os.path.lexists(gamedrive_path):
                        os.remove(gamedrive_path)
                else:
                    if os.path.lexists(gamedrive_path):
                        cur_tgt = os.readlink(gamedrive_path)
                        if cur_tgt != library_dir:
                            os.remove(gamedrive_path)
                            os.symlink(library_dir, gamedrive_path)
                    else:
                        os.symlink(library_dir, gamedrive_path)
            elif os.path.lexists(gamedrive_path):
                os.remove(gamedrive_path)

def comma_escaped(s):
    escaped = False
    idx = -1
    while s[idx] == '\\':
        escaped = not escaped
        idx = idx - 1
    return escaped

class Session:
    def __init__(self):
        self.log_file = None
        self.env = dict(os.environ)
        self.dlloverrides = {
                "steam.exe": "b", #always use our special built-in steam.exe
                "dotnetfx35.exe": "b", #replace the broken installer, as does Windows
                "mfplay": "n" #disable built-in mfplay
        }

        self.compat_config = set()
        self.cmdlineappend = []

        if "STEAM_COMPAT_CONFIG" in os.environ:
            config = os.environ["STEAM_COMPAT_CONFIG"]

            while config:
                (cur, sep, config) = config.partition(',')
                if cur.startswith("cmdlineappend:"):
                    while comma_escaped(cur):
                        (a, b, c) = config.partition(',')
                        cur = cur[:-1] + ',' + a
                        config = c
                    self.cmdlineappend.append(cur[14:].replace('\\\\','\\'))
                else:
                    self.compat_config.add(cur)

        #turn forcelgadd on by default unless it is disabled in compat config
        if not "noforcelgadd" in self.compat_config:
            self.compat_config.add("forcelgadd")

    def init_wine(self):
        if "HOST_LC_ALL" in self.env and len(self.env["HOST_LC_ALL"]) > 0:
            #steam sets LC_ALL=C to help some games, but Wine requires the real value
            #in order to do path conversion between win32 and host. steam sets
            #HOST_LC_ALL to allow us to use the real value.
            self.env["LC_ALL"] = self.env["HOST_LC_ALL"]
        else:
            self.env.pop("LC_ALL", "")

        self.env.pop("WINEARCH", "")

        if 'ORIG_'+ld_path_var not in os.environ:
            # Allow wine to restore this when calling an external app.
            self.env['ORIG_'+ld_path_var] = os.environ.get(ld_path_var, '')

        prepend_to_env_str(self.env, ld_path_var, g_proton.lib64_dir + ":" + g_proton.lib_dir, ":")

        self.env["WINEDLLPATH"] = g_proton.lib64_dir + "/wine:" + g_proton.lib_dir + "/wine"

        self.env["GST_PLUGIN_SYSTEM_PATH_1_0"] = g_proton.lib64_dir + "gstreamer-1.0" + ":" + g_proton.lib_dir + "gstreamer-1.0"
        self.env["WINE_GST_REGISTRY_DIR"] = g_compatdata.path("gstreamer-1.0/")

        if "STEAM_COMPAT_MEDIA_PATH" in os.environ:
            self.env["MEDIACONV_AUDIO_DUMP_FILE"] = os.environ["STEAM_COMPAT_MEDIA_PATH"] + "/audio.foz"
            self.env["MEDIACONV_VIDEO_DUMP_FILE"] = os.environ["STEAM_COMPAT_MEDIA_PATH"] + "/video.foz"

        if "STEAM_COMPAT_TRANSCODED_MEDIA_PATH" in os.environ:
            self.env["MEDIACONV_AUDIO_TRANSCODED_FILE"] = os.environ["STEAM_COMPAT_TRANSCODED_MEDIA_PATH"] + "/transcoded_audio.foz"
            self.env["MEDIACONV_VIDEO_TRANSCODED_FILE"] = os.environ["STEAM_COMPAT_TRANSCODED_MEDIA_PATH"] + "/transcoded_video.foz"

        prepend_to_env_str(self.env, "PATH", g_proton.bin_dir, ":")

    def check_environment(self, env_name, config_name):
        if not env_name in self.env:
            return False
        if nonzero(self.env[env_name]):
            self.compat_config.add(config_name)
        else:
            self.compat_config.discard(config_name)
        return True

    def try_log_slr_versions(self):
        try:
            if "PRESSURE_VESSEL_RUNTIME_BASE" in self.env:
                with open(self.env["PRESSURE_VESSEL_RUNTIME_BASE"] + "/VERSIONS.txt", "r") as f:
                    for l in f:
                        l = l.strip()
                        if len(l) > 0 and not l.startswith("#"):
                            cleaned = l.split("#")[0].strip().replace("\t", " ")
                            split = cleaned.split(" ", maxsplit=1)
                            self.log_file.write(split[0] + ": " + split[1] + "\n")
        except (OSError, IOError, TypeError, KeyError):
            pass

    def init_session(self):
        self.env["WINEPREFIX"] = g_compatdata.prefix_dir

        #load environment overrides
        if os.path.exists(g_proton.user_settings_file):
            try:
                import user_settings
                for key, value in user_settings.user_settings.items():
                    self.env.setdefault(key, value)
            except:
                log("************************************************")
                log("THERE IS AN ERROR IN YOUR user_settings.py FILE:")
                log("%s" % sys.exc_info()[1])
                log("************************************************")

        if "PROTON_LOG" in self.env and nonzero(self.env["PROTON_LOG"]):
            self.env.setdefault("WINEDEBUG", "+timestamp,+pid,+tid,+seh,+debugstr,+loaddll,+mscoree")
            self.env.setdefault("DXVK_LOG_LEVEL", "info")
            self.env.setdefault("VKD3D_DEBUG", "warn")
            self.env.setdefault("WINE_MONO_TRACE", "E:System.NotImplementedException")

        #for performance, logging is disabled by default; override with user_settings.py
        self.env.setdefault("WINEDEBUG", "-all")
        self.env.setdefault("DXVK_LOG_LEVEL", "none")
        self.env.setdefault("VKD3D_DEBUG", "none")

        #default wine-mono override for FNA games
        self.env.setdefault("WINE_MONO_OVERRIDES", "Microsoft.Xna.Framework.*,Gac=n")

        if "wined3d11" in self.compat_config:
            self.compat_config.add("wined3d")

        if not self.check_environment("PROTON_USE_WINED3D", "wined3d"):
            self.check_environment("PROTON_USE_WINED3D11", "wined3d")
        self.check_environment("PROTON_NO_D3D11", "nod3d11")
        self.check_environment("PROTON_NO_D3D10", "nod3d10")
        self.check_environment("PROTON_NO_ESYNC", "noesync")
        self.check_environment("PROTON_NO_FSYNC", "nofsync")
        self.check_environment("PROTON_FORCE_LARGE_ADDRESS_AWARE", "forcelgadd")
        self.check_environment("PROTON_OLD_GL_STRING", "oldglstr")
        self.check_environment("PROTON_NO_WRITE_WATCH", "nowritewatch")
        self.check_environment("PROTON_HIDE_NVIDIA_GPU", "hidenvgpu")
        self.check_environment("PROTON_SET_GAME_DRIVE", "gamedrive")

        if "noesync" in self.compat_config:
            self.env.pop("WINEESYNC", "")
        else:
            self.env["WINEESYNC"] = "1"

        if "nofsync" in self.compat_config:
            self.env.pop("WINEFSYNC", "")
        else:
            self.env["WINEFSYNC"] = "1"

        if "nowritewatch" in self.compat_config:
            self.env["WINE_DISABLE_WRITE_WATCH"] = "1"

        if "oldglstr" in self.compat_config:
            #mesa override
            self.env["MESA_EXTENSION_MAX_YEAR"] = "2003"
            #nvidia override
            self.env["__GL_ExtensionStringVersion"] = "17700"

        if "forcelgadd" in self.compat_config:
            self.env["WINE_LARGE_ADDRESS_AWARE"] = "1"

        if "vkd3dbindlesstb" in self.compat_config:
            append_to_env_str(self.env, "VKD3D_CONFIG", "force_bindless_texel_buffer", ",")

        if "vkd3dfl12" in self.compat_config:
            if not "VKD3D_FEATURE_LEVEL" in self.env:
                self.env["VKD3D_FEATURE_LEVEL"] = "12_0"

        if "hidenvgpu" in self.compat_config:
            self.env["WINE_HIDE_NVIDIA_GPU"] = "1"

        if "SteamGameId" in self.env:
            if self.env["WINEDEBUG"] != "-all":
                basedir = self.env.get("PROTON_LOG_DIR", os.environ["HOME"])
                makedirs(basedir)
                lfile_path = basedir + "/steam-" + os.environ["SteamGameId"] + ".log"
                if os.path.exists(lfile_path):
                    os.remove(lfile_path)
                self.log_file = open(lfile_path, "w+")
                self.log_file.write("======================\n")
                with open(g_proton.version_file, "r") as f:
                    self.log_file.write("Proton: " + f.readline().strip() + "\n")
                self.log_file.write("SteamGameId: " + self.env["SteamGameId"] + "\n")
                self.log_file.write("Command: " + str(sys.argv[2:] + self.cmdlineappend) + "\n")
                self.log_file.write("Options: " + str(self.compat_config) + "\n")
                self.try_log_slr_versions()
                self.log_file.write("======================\n")
                self.log_file.flush()
        else:
            self.env["WINEDEBUG"] = "-all"

        g_compatdata.setup_prefix()

        if "nod3d11" in self.compat_config:
            self.dlloverrides["d3d11"] = ""
            if "dxgi" in self.dlloverrides:
                del self.dlloverrides["dxgi"]

        if "nod3d10" in self.compat_config:
            self.dlloverrides["d3d10_1"] = ""
            self.dlloverrides["d3d10"] = ""
            self.dlloverrides["dxgi"] = ""

        if "nativevulkanloader" in self.compat_config:
            self.dlloverrides["vulkan-1"] = "n"

        s = ""
        for dll in self.dlloverrides:
            setting = self.dlloverrides[dll]
            if len(s) > 0:
                s = s + ";" + dll + "=" + setting
            else:
                s = dll + "=" + setting
        append_to_env_str(self.env, "WINEDLLOVERRIDES", s, ";")

    def dump_dbg_env(self, f):
        f.write("PATH=\"" + self.env["PATH"] + "\" \\\n")
        f.write("\tTERM=\"xterm\" \\\n") #XXX
        f.write("\tWINEDEBUG=\"-all\" \\\n")
        f.write("\tWINEDLLPATH=\"" + self.env["WINEDLLPATH"] + "\" \\\n")
        f.write("\t" + ld_path_var + "=\"" + self.env[ld_path_var] + "\" \\\n")
        f.write("\tWINEPREFIX=\"" + self.env["WINEPREFIX"] + "\" \\\n")
        if "WINEESYNC" in self.env:
            f.write("\tWINEESYNC=\"" + self.env["WINEESYNC"] + "\" \\\n")
        if "WINEFSYNC" in self.env:
            f.write("\tWINEFSYNC=\"" + self.env["WINEFSYNC"] + "\" \\\n")
        if "SteamGameId" in self.env:
            f.write("\tSteamGameId=\"" + self.env["SteamGameId"] + "\" \\\n")
        if "SteamAppId" in self.env:
            f.write("\tSteamAppId=\"" + self.env["SteamAppId"] + "\" \\\n")
        if "WINEDLLOVERRIDES" in self.env:
            f.write("\tWINEDLLOVERRIDES=\"" + self.env["WINEDLLOVERRIDES"] + "\" \\\n")
        if "STEAM_COMPAT_CLIENT_INSTALL_PATH" in self.env:
            f.write("\tSTEAM_COMPAT_CLIENT_INSTALL_PATH=\"" + self.env["STEAM_COMPAT_CLIENT_INSTALL_PATH"] + "\" \\\n")
        if "WINE_LARGE_ADDRESS_AWARE" in self.env:
            f.write("\tWINE_LARGE_ADDRESS_AWARE=\"" + self.env["WINE_LARGE_ADDRESS_AWARE"] + "\" \\\n")
        if "GST_PLUGIN_SYSTEM_PATH_1_0" in self.env:
            f.write("\tGST_PLUGIN_SYSTEM_PATH_1_0=\"" + self.env["GST_PLUGIN_SYSTEM_PATH_1_0"] + "\" \\\n")
        if "WINE_GST_REGISTRY_DIR" in self.env:
            f.write("\tWINE_GST_REGISTRY_DIR=\"" + self.env["WINE_GST_REGISTRY_DIR"] + "\" \\\n")
        if "MEDIACONV_AUDIO_DUMP_FILE" in self.env:
            f.write("\tMEDIACONV_AUDIO_DUMP_FILE=\"" + self.env["MEDIACONV_AUDIO_DUMP_FILE"] + "\" \\\n")
        if "MEDIACONV_AUDIO_TRANSCODED_FILE" in self.env:
            f.write("\tMEDIACONV_AUDIO_TRANSCODED_FILE=\"" + self.env["MEDIACONV_AUDIO_TRANSCODED_FILE"] + "\" \\\n")
        if "MEDIACONV_VIDEO_DUMP_FILE" in self.env:
            f.write("\tMEDIACONV_VIDEO_DUMP_FILE=\"" + self.env["MEDIACONV_VIDEO_DUMP_FILE"] + "\" \\\n")
        if "MEDIACONV_VIDEO_TRANSCODED_FILE" in self.env:
            f.write("\tMEDIACONV_VIDEO_TRANSCODED_FILE=\"" + self.env["MEDIACONV_VIDEO_TRANSCODED_FILE"] + "\" \\\n")

    def dump_dbg_scripts(self):
        exe_name = os.path.basename(sys.argv[2])

        tmpdir = self.env.get("PROTON_DEBUG_DIR", "/tmp") + "/proton_" + os.environ["USER"] + "/"
        makedirs(tmpdir)

        with open(tmpdir + "winedbg", "w") as f:
            f.write("#!/bin/bash\n")
            f.write("#Run winedbg with args\n\n")
            f.write("cd \"" + os.getcwd() + "\"\n")
            self.dump_dbg_env(f)
            f.write("\t\"" + g_proton.wine_bin + "\" winedbg \"$@\"\n")
        os.chmod(tmpdir + "winedbg", 0o755)

        with open(tmpdir + "winedbg_run", "w") as f:
            f.write("#!/bin/bash\n")
            f.write("#Run winedbg and prepare to run game or given program\n\n")
            f.write("cd \"" + os.getcwd() + "\"\n")
            f.write("DEF_CMD=(")
            first = True
            for arg in sys.argv[2:]:
                if first:
                    f.write("\"" + arg + "\"")
                    first = False
                else:
                    f.write(" \"" + arg + "\"")
            f.write(")\n")
            self.dump_dbg_env(f)
            f.write("\t\"" + g_proton.wine_bin + "\" winedbg \"${@:-${DEF_CMD[@]}}\"\n")
        os.chmod(tmpdir + "winedbg_run", 0o755)

        with open(tmpdir + "gdb_attach", "w") as f:
            f.write("#!/bin/bash\n")
            f.write("#Run winedbg in gdb mode and auto-attach to already-running program\n\n")
            f.write("cd \"" + os.getcwd() + "\"\n")
            f.write("EXE_NAME=${1:-\"" + exe_name + "\"}\n")
            f.write("WPID_HEX=$(\"" + tmpdir + "winedbg\" --command 'info process' | grep -i \"$EXE_NAME\" | cut -f2 -d' ' | tr -d '0')\n")
            f.write("if [ -z \"$WPID_HEX\" ]; then \n")
            f.write("    echo \"Program does not appear to be running: \\\"$EXE_NAME\\\"\"\n")
            f.write("    exit 1\n")
            f.write("fi\n")
            f.write("WPID_DEC=$(printf %d 0x$WPID_HEX)\n")
            self.dump_dbg_env(f)
            f.write("\t\"" + g_proton.wine_bin + "\" winedbg --gdb $WPID_DEC\n")
        os.chmod(tmpdir + "gdb_attach", 0o755)

        with open(tmpdir + "gdb_run", "w") as f:
            f.write("#!/bin/bash\n")
            f.write("#Run winedbg in gdb mode and prepare to run game or given program\n\n")
            f.write("cd \"" + os.getcwd() + "\"\n")
            f.write("DEF_CMD=(")
            first = True
            for arg in sys.argv[2:]:
                if first:
                    f.write("\"" + arg + "\"")
                    first = False
                else:
                    f.write(" \"" + arg + "\"")
            f.write(")\n")
            self.dump_dbg_env(f)
            f.write("\t\"" + g_proton.wine_bin + "\" winedbg --gdb \"${@:-${DEF_CMD[@]}}\"\n")
        os.chmod(tmpdir + "gdb_run", 0o755)

        with open(tmpdir + "run", "w") as f:
            f.write("#!/bin/bash\n")
            f.write("#Run game or given command in environment\n\n")
            f.write("cd \"" + os.getcwd() + "\"\n")
            f.write("DEF_CMD=(")
            first = True
            for arg in sys.argv[2:]:
                if first:
                    f.write("\"" + arg + "\"")
                    first = False
                else:
                    f.write(" \"" + arg + "\"")
            f.write(")\n")
            self.dump_dbg_env(f)
            f.write("\t\"" + g_proton.wine_bin + "\" steam.exe \"${@:-${DEF_CMD[@]}}\"\n")
        os.chmod(tmpdir + "run", 0o755)

    def run_proc(self, args, local_env=None):
        if local_env is None:
            local_env = self.env
        subprocess.call(args, env=local_env, stderr=self.log_file, stdout=self.log_file)

    def run(self):
        if "PROTON_DUMP_DEBUG_COMMANDS" in self.env and nonzero(self.env["PROTON_DUMP_DEBUG_COMMANDS"]):
            try:
                self.dump_dbg_scripts()
            except OSError:
                log("Unable to write debug scripts! " + str(sys.exc_info()[1]))
        self.run_proc([g_proton.wine_bin, "steam"] + sys.argv[2:] + self.cmdlineappend)


if __name__ == "__main__":
    if not "STEAM_COMPAT_DATA_PATH" in os.environ:
        log("No compat data path?")
        sys.exit(1)

    g_proton = Proton(os.path.dirname(sys.argv[0]))

    if g_proton.need_tarball_extraction():
        g_proton.extract_tarball()

    g_compatdata = CompatData(os.environ["STEAM_COMPAT_DATA_PATH"])

    g_session = Session()

    g_session.init_wine()

    if g_proton.missing_default_prefix():
        g_proton.make_default_prefix()

    g_session.init_session()

    #determine mode
    if sys.argv[1] == "run":
        #start target app
        g_session.run()
    elif sys.argv[1] == "waitforexitandrun":
        #wait for wineserver to shut down
        g_session.run_proc([g_proton.wineserver_bin, "-w"])
        #then run
        g_session.run()
    elif sys.argv[1] == "getcompatpath":
        #linux -> windows path
        path = subprocess.check_output([g_proton.wine_bin, "winepath", "-w", sys.argv[2]], env=g_session.env, stderr=g_session.log_file)
        sys.stdout.buffer.write(path)
    elif sys.argv[1] == "getnativepath":
        #windows -> linux path
        path = subprocess.check_output([g_proton.wine_bin, "winepath", sys.argv[2]], env=g_session.env, stderr=g_session.log_file)
        sys.stdout.buffer.write(path)
    else:
        log("Need a verb.")
        sys.exit(1)

    sys.exit(0)

#pylint --disable=C0301,C0326,C0330,C0111,C0103,R0902,C1801,R0914,R0912,R0915
# vim: set syntax=python: