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2507 lines (2191 loc) · 76.3 KB
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/*
* Rewritten Python launcher for Windows
*
* This new rewrite properly handles PEP 514 and allows any registered Python
* runtime to be launched. It also enables auto-install of versions when they
* are requested but no installation can be found.
*/
#define __STDC_WANT_LIB_EXT1__ 1
#include <windows.h>
#include <pathcch.h>
#include <fcntl.h>
#include <io.h>
#include <shlobj.h>
#include <stdio.h>
#include <stdbool.h>
#include <tchar.h>
#define MS_WINDOWS
#include "patchlevel.h"
#define MAXLEN PATHCCH_MAX_CCH
#define MSGSIZE 1024
#define RC_NO_STD_HANDLES 100
#define RC_CREATE_PROCESS 101
#define RC_BAD_VIRTUAL_PATH 102
#define RC_NO_PYTHON 103
#define RC_NO_MEMORY 104
#define RC_NO_SCRIPT 105
#define RC_NO_VENV_CFG 106
#define RC_BAD_VENV_CFG 107
#define RC_NO_COMMANDLINE 108
#define RC_INTERNAL_ERROR 109
#define RC_DUPLICATE_ITEM 110
#define RC_INSTALLING 111
#define RC_NO_PYTHON_AT_ALL 112
#define RC_NO_SHEBANG 113
static FILE * log_fp = NULL;
void
debug(wchar_t * format, ...)
{
va_list va;
if (log_fp != NULL) {
wchar_t buffer[MAXLEN];
int r = 0;
va_start(va, format);
r = vswprintf_s(buffer, MAXLEN, format, va);
va_end(va);
if (r <= 0) {
return;
}
fputws(buffer, log_fp);
while (r && isspace(buffer[r])) {
buffer[r--] = L'\0';
}
if (buffer[0]) {
OutputDebugStringW(buffer);
}
}
}
void
formatWinerror(int rc, wchar_t * message, int size)
{
FormatMessageW(
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, rc, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
message, size, NULL);
}
void
winerror(int err, wchar_t * format, ... )
{
va_list va;
wchar_t message[MSGSIZE];
wchar_t win_message[MSGSIZE];
int len;
if (err == 0) {
err = GetLastError();
}
va_start(va, format);
len = _vsnwprintf_s(message, MSGSIZE, _TRUNCATE, format, va);
va_end(va);
formatWinerror(err, win_message, MSGSIZE);
if (len >= 0) {
_snwprintf_s(&message[len], MSGSIZE - len, _TRUNCATE, L": %s",
win_message);
}
#if !defined(_WINDOWS)
fwprintf(stderr, L"%s\n", message);
#else
MessageBoxW(NULL, message, L"Python Launcher is sorry to say ...",
MB_OK);
#endif
}
void
error(wchar_t * format, ... )
{
va_list va;
wchar_t message[MSGSIZE];
va_start(va, format);
_vsnwprintf_s(message, MSGSIZE, _TRUNCATE, format, va);
va_end(va);
#if !defined(_WINDOWS)
fwprintf(stderr, L"%s\n", message);
#else
MessageBoxW(NULL, message, L"Python Launcher is sorry to say ...",
MB_OK);
#endif
}
typedef BOOL (*PIsWow64Process2)(HANDLE, USHORT*, USHORT*);
USHORT
_getNativeMachine()
{
static USHORT _nativeMachine = IMAGE_FILE_MACHINE_UNKNOWN;
if (_nativeMachine == IMAGE_FILE_MACHINE_UNKNOWN) {
USHORT processMachine;
HMODULE kernel32 = GetModuleHandleW(L"kernel32.dll");
PIsWow64Process2 IsWow64Process2 = kernel32 ?
(PIsWow64Process2)GetProcAddress(kernel32, "IsWow64Process2") :
NULL;
if (!IsWow64Process2) {
BOOL wow64Process;
if (!IsWow64Process(NULL, &wow64Process)) {
winerror(0, L"Checking process type");
} else if (wow64Process) {
// We should always be a 32-bit executable, so if running
// under emulation, it must be a 64-bit host.
_nativeMachine = IMAGE_FILE_MACHINE_AMD64;
} else {
// Not running under emulation, and an old enough OS to not
// have IsWow64Process2, so assume it's x86.
_nativeMachine = IMAGE_FILE_MACHINE_I386;
}
} else if (!IsWow64Process2(NULL, &processMachine, &_nativeMachine)) {
winerror(0, L"Checking process type");
}
}
return _nativeMachine;
}
bool
isAMD64Host()
{
return _getNativeMachine() == IMAGE_FILE_MACHINE_AMD64;
}
bool
isARM64Host()
{
return _getNativeMachine() == IMAGE_FILE_MACHINE_ARM64;
}
bool
isEnvVarSet(const wchar_t *name)
{
/* only looking for non-empty, which means at least one character
and the null terminator */
return GetEnvironmentVariableW(name, NULL, 0) >= 2;
}
bool
join(wchar_t *buffer, size_t bufferLength, const wchar_t *fragment)
{
if (SUCCEEDED(PathCchCombineEx(buffer, bufferLength, buffer, fragment, PATHCCH_ALLOW_LONG_PATHS))) {
return true;
}
return false;
}
int
_compare(const wchar_t *x, int xLen, const wchar_t *y, int yLen)
{
// Empty strings sort first
if (!x || !xLen) {
return (!y || !yLen) ? 0 : -1;
} else if (!y || !yLen) {
return 1;
}
switch (CompareStringEx(
LOCALE_NAME_INVARIANT, NORM_IGNORECASE | SORT_DIGITSASNUMBERS,
x, xLen, y, yLen,
NULL, NULL, 0
)) {
case CSTR_LESS_THAN:
return -1;
case CSTR_EQUAL:
return 0;
case CSTR_GREATER_THAN:
return 1;
default:
winerror(0, L"Error comparing '%.*s' and '%.*s' (compare)", xLen, x, yLen, y);
return -1;
}
}
int
_compareArgument(const wchar_t *x, int xLen, const wchar_t *y, int yLen)
{
// Empty strings sort first
if (!x || !xLen) {
return (!y || !yLen) ? 0 : -1;
} else if (!y || !yLen) {
return 1;
}
switch (CompareStringEx(
LOCALE_NAME_INVARIANT, 0,
x, xLen, y, yLen,
NULL, NULL, 0
)) {
case CSTR_LESS_THAN:
return -1;
case CSTR_EQUAL:
return 0;
case CSTR_GREATER_THAN:
return 1;
default:
winerror(0, L"Error comparing '%.*s' and '%.*s' (compareArgument)", xLen, x, yLen, y);
return -1;
}
}
int
_comparePath(const wchar_t *x, int xLen, const wchar_t *y, int yLen)
{
// Empty strings sort first
if (!x || !xLen) {
return !y || !yLen ? 0 : -1;
} else if (!y || !yLen) {
return 1;
}
switch (CompareStringOrdinal(x, xLen, y, yLen, TRUE)) {
case CSTR_LESS_THAN:
return -1;
case CSTR_EQUAL:
return 0;
case CSTR_GREATER_THAN:
return 1;
default:
winerror(0, L"Error comparing '%.*s' and '%.*s' (comparePath)", xLen, x, yLen, y);
return -1;
}
}
bool
_startsWith(const wchar_t *x, int xLen, const wchar_t *y, int yLen)
{
if (!x || !y) {
return false;
}
yLen = yLen < 0 ? (int)wcsnlen_s(y, MAXLEN) : yLen;
xLen = xLen < 0 ? (int)wcsnlen_s(x, MAXLEN) : xLen;
return xLen >= yLen && 0 == _compare(x, yLen, y, yLen);
}
bool
_startsWithArgument(const wchar_t *x, int xLen, const wchar_t *y, int yLen)
{
if (!x || !y) {
return false;
}
yLen = yLen < 0 ? (int)wcsnlen_s(y, MAXLEN) : yLen;
xLen = xLen < 0 ? (int)wcsnlen_s(x, MAXLEN) : xLen;
return xLen >= yLen && 0 == _compareArgument(x, yLen, y, yLen);
}
/******************************************************************************\
*** HELP TEXT ***
\******************************************************************************/
int
showHelpText(wchar_t ** argv)
{
// The help text is stored in launcher-usage.txt, which is compiled into
// the launcher and loaded at runtime if needed.
//
// The file must be UTF-8. There are two substitutions:
// %ls - PY_VERSION (as wchar_t*)
// %ls - argv[0] (as wchar_t*)
HRSRC res = FindResourceExW(NULL, L"USAGE", MAKEINTRESOURCE(1), MAKELANGID(LANG_NEUTRAL, SUBLANG_NEUTRAL));
HGLOBAL resData = res ? LoadResource(NULL, res) : NULL;
const char *usage = resData ? (const char*)LockResource(resData) : NULL;
if (usage == NULL) {
winerror(0, L"Unable to load usage text");
return RC_INTERNAL_ERROR;
}
DWORD cbData = SizeofResource(NULL, res);
DWORD cchUsage = MultiByteToWideChar(CP_UTF8, 0, usage, cbData, NULL, 0);
if (!cchUsage) {
winerror(0, L"Unable to preprocess usage text");
return RC_INTERNAL_ERROR;
}
cchUsage += 1;
wchar_t *wUsage = (wchar_t*)malloc(cchUsage * sizeof(wchar_t));
cchUsage = MultiByteToWideChar(CP_UTF8, 0, usage, cbData, wUsage, cchUsage);
if (!cchUsage) {
winerror(0, L"Unable to preprocess usage text");
free((void *)wUsage);
return RC_INTERNAL_ERROR;
}
// Ensure null termination
wUsage[cchUsage] = L'\0';
fwprintf(stdout, wUsage, (L"" PY_VERSION), argv[0]);
fflush(stdout);
free((void *)wUsage);
return 0;
}
/******************************************************************************\
*** SEARCH INFO ***
\******************************************************************************/
struct _SearchInfoBuffer {
struct _SearchInfoBuffer *next;
wchar_t buffer[0];
};
typedef struct {
// the original string, managed by the OS
const wchar_t *originalCmdLine;
// pointer into the cmdline to mark what we've consumed
const wchar_t *restOfCmdLine;
// if known/discovered, the full executable path of our runtime
const wchar_t *executablePath;
// pointer and length into cmdline for the file to check for a
// shebang line, if any. Length can be -1 if the string is null
// terminated.
const wchar_t *scriptFile;
int scriptFileLength;
// pointer and length into cmdline or a static string with the
// name of the target executable. Length can be -1 if the string
// is null terminated.
const wchar_t *executable;
int executableLength;
// pointer and length into a string with additional interpreter
// arguments to include before restOfCmdLine. Length can be -1 if
// the string is null terminated.
const wchar_t *executableArgs;
int executableArgsLength;
// pointer and length into cmdline or a static string with the
// company name for PEP 514 lookup. Length can be -1 if the string
// is null terminated.
const wchar_t *company;
int companyLength;
// pointer and length into cmdline or a static string with the
// tag for PEP 514 lookup. Length can be -1 if the string is
// null terminated.
const wchar_t *tag;
int tagLength;
// if true, treats 'tag' as a non-PEP 514 filter
bool oldStyleTag;
// if true, ignores 'tag' when a high priority environment is found
// gh-92817: This is currently set when a tag is read from configuration or
// the environment, rather than the command line or a shebang line, and the
// only currently possible high priority environment is an active virtual
// environment
bool lowPriorityTag;
// if true, we had an old-style tag with '-64' suffix, and so do not
// want to match tags like '3.x-32'
bool exclude32Bit;
// if true, we had an old-style tag with '-32' suffix, and so *only*
// want to match tags like '3.x-32'
bool only32Bit;
// if true, allow PEP 514 lookup to override 'executable'
bool allowExecutableOverride;
// if true, allow a nearby pyvenv.cfg to locate the executable
bool allowPyvenvCfg;
// if true, allow defaults (env/py.ini) to clarify/override tags
bool allowDefaults;
// if true, prefer windowed (console-less) executable
bool windowed;
// if true, only list detected runtimes without launching
bool list;
// if true, only list detected runtimes with paths without launching
bool listPaths;
// if true, display help message before contiuning
bool help;
// dynamically allocated buffers to free later
struct _SearchInfoBuffer *_buffer;
} SearchInfo;
wchar_t *
allocSearchInfoBuffer(SearchInfo *search, int wcharCount)
{
struct _SearchInfoBuffer *buffer = (struct _SearchInfoBuffer*)malloc(
sizeof(struct _SearchInfoBuffer) +
wcharCount * sizeof(wchar_t)
);
if (!buffer) {
return NULL;
}
buffer->next = search->_buffer;
search->_buffer = buffer;
return buffer->buffer;
}
void
freeSearchInfo(SearchInfo *search)
{
struct _SearchInfoBuffer *b = search->_buffer;
search->_buffer = NULL;
while (b) {
struct _SearchInfoBuffer *nextB = b->next;
free((void *)b);
b = nextB;
}
}
void
_debugStringAndLength(const wchar_t *s, int len, const wchar_t *name)
{
if (!s) {
debug(L"%s: (null)\n", name);
} else if (len == 0) {
debug(L"%s: (empty)\n", name);
} else if (len < 0) {
debug(L"%s: %s\n", name, s);
} else {
debug(L"%s: %.*ls\n", name, len, s);
}
}
void
dumpSearchInfo(SearchInfo *search)
{
if (!log_fp) {
return;
}
#define DEBUGNAME(s) L"SearchInfo." ## s
#define DEBUG(s) debug(DEBUGNAME(#s) L": %s\n", (search->s) ? (search->s) : L"(null)")
#define DEBUG_2(s, sl) _debugStringAndLength((search->s), (search->sl), DEBUGNAME(#s))
#define DEBUG_BOOL(s) debug(DEBUGNAME(#s) L": %s\n", (search->s) ? L"True" : L"False")
DEBUG(originalCmdLine);
DEBUG(restOfCmdLine);
DEBUG(executablePath);
DEBUG_2(scriptFile, scriptFileLength);
DEBUG_2(executable, executableLength);
DEBUG_2(executableArgs, executableArgsLength);
DEBUG_2(company, companyLength);
DEBUG_2(tag, tagLength);
DEBUG_BOOL(oldStyleTag);
DEBUG_BOOL(lowPriorityTag);
DEBUG_BOOL(exclude32Bit);
DEBUG_BOOL(only32Bit);
DEBUG_BOOL(allowDefaults);
DEBUG_BOOL(allowExecutableOverride);
DEBUG_BOOL(windowed);
DEBUG_BOOL(list);
DEBUG_BOOL(listPaths);
DEBUG_BOOL(help);
#undef DEBUG_BOOL
#undef DEBUG_2
#undef DEBUG
#undef DEBUGNAME
}
int
findArgumentLength(const wchar_t *buffer, int bufferLength)
{
if (bufferLength < 0) {
bufferLength = (int)wcsnlen_s(buffer, MAXLEN);
}
if (bufferLength == 0) {
return 0;
}
const wchar_t *end;
int i;
if (buffer[0] != L'"') {
end = wcschr(buffer, L' ');
if (!end) {
return bufferLength;
}
i = (int)(end - buffer);
return i < bufferLength ? i : bufferLength;
}
i = 0;
while (i < bufferLength) {
end = wcschr(&buffer[i + 1], L'"');
if (!end) {
return bufferLength;
}
i = (int)(end - buffer);
if (i >= bufferLength) {
return bufferLength;
}
int j = i;
while (j > 1 && buffer[--j] == L'\\') {
if (j > 0 && buffer[--j] == L'\\') {
// Even number, so back up and keep counting
} else {
// Odd number, so it's escaped and we want to keep searching
continue;
}
}
// Non-escaped quote with space after it - end of the argument!
if (i + 1 >= bufferLength || isspace(buffer[i + 1])) {
return i + 1;
}
}
return bufferLength;
}
const wchar_t *
findArgumentEnd(const wchar_t *buffer, int bufferLength)
{
return &buffer[findArgumentLength(buffer, bufferLength)];
}
/******************************************************************************\
*** COMMAND-LINE PARSING ***
\******************************************************************************/
int
parseCommandLine(SearchInfo *search)
{
if (!search || !search->originalCmdLine) {
return RC_NO_COMMANDLINE;
}
const wchar_t *tail = findArgumentEnd(search->originalCmdLine, -1);
const wchar_t *end = tail;
search->restOfCmdLine = tail;
while (--tail != search->originalCmdLine) {
if (*tail == L'.' && end == search->restOfCmdLine) {
end = tail;
} else if (*tail == L'\\' || *tail == L'/') {
++tail;
break;
}
}
if (tail == search->originalCmdLine && tail[0] == L'"') {
++tail;
}
// Without special cases, we can now fill in the search struct
int tailLen = (int)(end ? (end - tail) : wcsnlen_s(tail, MAXLEN));
search->executableLength = -1;
// Our special cases are as follows
#define MATCHES(s) (0 == _comparePath(tail, tailLen, (s), -1))
#define STARTSWITH(s) _startsWith(tail, tailLen, (s), -1)
if (MATCHES(L"py")) {
search->executable = L"python.exe";
search->allowExecutableOverride = true;
search->allowDefaults = true;
} else if (MATCHES(L"pyw")) {
search->executable = L"pythonw.exe";
search->allowExecutableOverride = true;
search->allowDefaults = true;
search->windowed = true;
} else if (MATCHES(L"py_d")) {
search->executable = L"python_d.exe";
search->allowExecutableOverride = true;
search->allowDefaults = true;
} else if (MATCHES(L"pyw_d")) {
search->executable = L"pythonw_d.exe";
search->allowExecutableOverride = true;
search->allowDefaults = true;
search->windowed = true;
} else if (STARTSWITH(L"python3")) {
search->executable = L"python.exe";
search->tag = &tail[6];
search->tagLength = tailLen - 6;
search->allowExecutableOverride = true;
search->oldStyleTag = true;
search->allowPyvenvCfg = true;
} else if (STARTSWITH(L"pythonw3")) {
search->executable = L"pythonw.exe";
search->tag = &tail[7];
search->tagLength = tailLen - 7;
search->allowExecutableOverride = true;
search->oldStyleTag = true;
search->allowPyvenvCfg = true;
search->windowed = true;
} else {
search->executable = tail;
search->executableLength = tailLen;
search->allowPyvenvCfg = true;
}
#undef STARTSWITH
#undef MATCHES
// First argument might be one of our options. If so, consume it,
// update flags and then set restOfCmdLine.
const wchar_t *arg = search->restOfCmdLine;
while(*arg && isspace(*arg)) { ++arg; }
#define MATCHES(s) (0 == _compareArgument(arg, argLen, (s), -1))
#define STARTSWITH(s) _startsWithArgument(arg, argLen, (s), -1)
if (*arg && *arg == L'-' && *++arg) {
tail = arg;
while (*tail && !isspace(*tail)) { ++tail; }
int argLen = (int)(tail - arg);
if (argLen > 0) {
if (STARTSWITH(L"2") || STARTSWITH(L"3")) {
// All arguments starting with 2 or 3 are assumed to be version tags
search->tag = arg;
search->tagLength = argLen;
search->oldStyleTag = true;
search->restOfCmdLine = tail;
// If the tag ends with -64, we want to exclude 32-bit runtimes
// (If the tag ends with -32, it will be filtered later)
if (argLen > 3) {
if (0 == _compareArgument(&arg[argLen - 3], 3, L"-64", 3)) {
search->tagLength -= 3;
search->exclude32Bit = true;
} else if (0 == _compareArgument(&arg[argLen - 3], 3, L"-32", 3)) {
search->tagLength -= 3;
search->only32Bit = true;
}
}
} else if (STARTSWITH(L"V:") || STARTSWITH(L"-version:")) {
// Arguments starting with 'V:' specify company and/or tag
const wchar_t *argStart = wcschr(arg, L':') + 1;
const wchar_t *tagStart = wcschr(argStart, L'/') ;
if (tagStart) {
search->company = argStart;
search->companyLength = (int)(tagStart - argStart);
search->tag = tagStart + 1;
} else {
search->tag = argStart;
}
search->tagLength = (int)(tail - search->tag);
search->restOfCmdLine = tail;
} else if (MATCHES(L"0") || MATCHES(L"-list")) {
search->list = true;
search->restOfCmdLine = tail;
} else if (MATCHES(L"0p") || MATCHES(L"-list-paths")) {
search->listPaths = true;
search->restOfCmdLine = tail;
} else if (MATCHES(L"h") || MATCHES(L"-help")) {
search->help = true;
// Do not update restOfCmdLine so that we trigger the help
// message from whichever interpreter we select
}
}
}
#undef STARTSWITH
#undef MATCHES
// Might have a script filename. If it looks like a filename, add
// it to the SearchInfo struct for later reference.
arg = search->restOfCmdLine;
while(*arg && isspace(*arg)) { ++arg; }
if (*arg && *arg != L'-') {
search->scriptFile = arg;
if (*arg == L'"') {
++search->scriptFile;
while (*++arg && *arg != L'"') { }
} else {
while (*arg && !isspace(*arg)) { ++arg; }
}
search->scriptFileLength = (int)(arg - search->scriptFile);
}
return 0;
}
int
_decodeShebang(SearchInfo *search, const char *buffer, int bufferLength, bool onlyUtf8, wchar_t **decoded, int *decodedLength)
{
DWORD cp = CP_UTF8;
int wideLen = MultiByteToWideChar(cp, MB_ERR_INVALID_CHARS, buffer, bufferLength, NULL, 0);
if (!wideLen) {
cp = CP_ACP;
wideLen = MultiByteToWideChar(cp, MB_ERR_INVALID_CHARS, buffer, bufferLength, NULL, 0);
if (!wideLen) {
debug(L"# Failed to decode shebang line (0x%08X)\n", GetLastError());
return RC_BAD_VIRTUAL_PATH;
}
}
wchar_t *b = allocSearchInfoBuffer(search, wideLen + 1);
if (!b) {
return RC_NO_MEMORY;
}
wideLen = MultiByteToWideChar(cp, 0, buffer, bufferLength, b, wideLen + 1);
if (!wideLen) {
debug(L"# Failed to decode shebang line (0x%08X)\n", GetLastError());
return RC_BAD_VIRTUAL_PATH;
}
b[wideLen] = L'\0';
*decoded = b;
*decodedLength = wideLen;
return 0;
}
bool
_shebangStartsWith(const wchar_t *buffer, int bufferLength, const wchar_t *prefix, const wchar_t **rest)
{
int prefixLength = (int)wcsnlen_s(prefix, MAXLEN);
if (bufferLength < prefixLength) {
return false;
}
if (rest) {
*rest = &buffer[prefixLength];
}
return _startsWithArgument(buffer, bufferLength, prefix, prefixLength);
}
int
searchPath(SearchInfo *search, const wchar_t *shebang, int shebangLength)
{
if (isEnvVarSet(L"PYLAUNCHER_NO_SEARCH_PATH")) {
return RC_NO_SHEBANG;
}
wchar_t *command;
if (!_shebangStartsWith(shebang, shebangLength, L"/usr/bin/env ", &command)) {
return RC_NO_SHEBANG;
}
wchar_t filename[MAXLEN];
int lastDot = 0;
int commandLength = 0;
while (commandLength < MAXLEN && command[commandLength] && !isspace(command[commandLength])) {
if (command[commandLength] == L'.') {
lastDot = commandLength;
}
filename[commandLength] = command[commandLength];
commandLength += 1;
}
if (!commandLength || commandLength == MAXLEN) {
return RC_BAD_VIRTUAL_PATH;
}
filename[commandLength] = L'\0';
const wchar_t *ext = L".exe";
// If the command already has an extension, we do not want to add it again
if (!lastDot || _comparePath(&filename[lastDot], -1, ext, -1)) {
if (wcscat_s(filename, MAXLEN, L".exe")) {
return RC_BAD_VIRTUAL_PATH;
}
}
wchar_t pathVariable[MAXLEN];
int n = GetEnvironmentVariableW(L"PATH", pathVariable, MAXLEN);
if (!n) {
if (GetLastError() == ERROR_ENVVAR_NOT_FOUND) {
return RC_NO_SHEBANG;
}
winerror(0, L"Failed to read PATH\n", filename);
return RC_INTERNAL_ERROR;
}
wchar_t buffer[MAXLEN];
n = SearchPathW(pathVariable, filename, NULL, MAXLEN, buffer, NULL);
if (!n) {
if (GetLastError() == ERROR_FILE_NOT_FOUND) {
debug(L"# Did not find %s on PATH\n", filename);
// If we didn't find it on PATH, let normal handling take over
return RC_NO_SHEBANG;
}
// Other errors should cause us to break
winerror(0, L"Failed to find %s on PATH\n", filename);
return RC_BAD_VIRTUAL_PATH;
}
// Check that we aren't going to call ourselves again
// If we are, pretend there was no shebang and let normal handling take over
if (GetModuleFileNameW(NULL, filename, MAXLEN) &&
0 == _comparePath(filename, -1, buffer, -1)) {
debug(L"# ignoring recursive shebang command\n");
return RC_NO_SHEBANG;
}
wchar_t *buf = allocSearchInfoBuffer(search, n + 1);
if (!buf || wcscpy_s(buf, n + 1, buffer)) {
return RC_NO_MEMORY;
}
search->executablePath = buf;
search->executableArgs = &command[commandLength];
search->executableArgsLength = shebangLength - commandLength;
debug(L"# Found %s on PATH\n", buf);
return 0;
}
int
_readIni(const wchar_t *section, const wchar_t *settingName, wchar_t *buffer, int bufferLength)
{
wchar_t iniPath[MAXLEN];
int n;
if (SUCCEEDED(SHGetFolderPathW(NULL, CSIDL_LOCAL_APPDATA, NULL, 0, iniPath)) &&
join(iniPath, MAXLEN, L"py.ini")) {
debug(L"# Reading from %s for %s/%s\n", iniPath, section, settingName);
n = GetPrivateProfileStringW(section, settingName, NULL, buffer, bufferLength, iniPath);
if (n) {
debug(L"# Found %s in %s\n", settingName, iniPath);
return n;
} else if (GetLastError() == ERROR_FILE_NOT_FOUND) {
debug(L"# Did not find file %s\n", iniPath);
} else {
winerror(0, L"Failed to read from %s\n", iniPath);
}
}
if (GetModuleFileNameW(NULL, iniPath, MAXLEN) &&
SUCCEEDED(PathCchRemoveFileSpec(iniPath, MAXLEN)) &&
join(iniPath, MAXLEN, L"py.ini")) {
debug(L"# Reading from %s for %s/%s\n", iniPath, section, settingName);
n = GetPrivateProfileStringW(section, settingName, NULL, buffer, MAXLEN, iniPath);
if (n) {
debug(L"# Found %s in %s\n", settingName, iniPath);
return n;
} else if (GetLastError() == ERROR_FILE_NOT_FOUND) {
debug(L"# Did not find file %s\n", iniPath);
} else {
winerror(0, L"Failed to read from %s\n", iniPath);
}
}
return 0;
}
bool
_findCommand(SearchInfo *search, const wchar_t *command, int commandLength)
{
wchar_t commandBuffer[MAXLEN];
wchar_t buffer[MAXLEN];
wcsncpy_s(commandBuffer, MAXLEN, command, commandLength);
int n = _readIni(L"commands", commandBuffer, buffer, MAXLEN);
if (!n) {
return false;
}
wchar_t *path = allocSearchInfoBuffer(search, n + 1);
if (!path) {
return false;
}
wcscpy_s(path, n + 1, buffer);
search->executablePath = path;
return true;
}
int
checkShebang(SearchInfo *search)
{
// Do not check shebang if a tag was provided or if no script file
// was found on the command line.
if (search->tag || !search->scriptFile) {
return 0;
}
if (search->scriptFileLength < 0) {
search->scriptFileLength = (int)wcsnlen_s(search->scriptFile, MAXLEN);
}
wchar_t *scriptFile = (wchar_t*)malloc(sizeof(wchar_t) * (search->scriptFileLength + 1));
if (!scriptFile) {
return RC_NO_MEMORY;
}
wcsncpy_s(scriptFile, search->scriptFileLength + 1,
search->scriptFile, search->scriptFileLength);
HANDLE hFile = CreateFileW(scriptFile, GENERIC_READ,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
NULL, OPEN_EXISTING, 0, NULL);
if (hFile == INVALID_HANDLE_VALUE) {
debug(L"# Failed to open %s for shebang parsing (0x%08X)\n",
scriptFile, GetLastError());
free(scriptFile);
return 0;
}
DWORD bytesRead = 0;
char buffer[4096];
if (!ReadFile(hFile, buffer, sizeof(buffer), &bytesRead, NULL)) {
debug(L"# Failed to read %s for shebang parsing (0x%08X)\n",
scriptFile, GetLastError());
free(scriptFile);
return 0;
}
CloseHandle(hFile);
debug(L"# Read %d bytes from %s to find shebang line\n", bytesRead, scriptFile);
free(scriptFile);
char *b = buffer;
bool onlyUtf8 = false;
if (bytesRead > 3 && *b == 0xEF) {
if (*++b == 0xBB && *++b == 0xBF) {
// Allow a UTF-8 BOM
++b;
bytesRead -= 3;
onlyUtf8 = true;
} else {
debug(L"# Invalid BOM in shebang line");
return 0;
}
}
if (bytesRead <= 2 || b[0] != '#' || b[1] != '!') {
// No shebang (#!) at start of line
debug(L"# No valid shebang line");
return 0;
}
++b;
--bytesRead;
while (--bytesRead > 0 && isspace(*++b)) { }
char *start = b;
while (--bytesRead > 0 && *++b != '\r' && *b != '\n') { }
wchar_t *shebang;
int shebangLength;
// We add 1 when bytesRead==0, as in that case we hit EOF and b points
// to the last character in the file, not the newline
int exitCode = _decodeShebang(search, start, (int)(b - start + (bytesRead == 0)), onlyUtf8, &shebang, &shebangLength);
if (exitCode) {
return exitCode;
}
debug(L"Shebang: %s\n", shebang);
// Handle shebangs that we should search PATH for
exitCode = searchPath(search, shebang, shebangLength);
if (exitCode != RC_NO_SHEBANG) {
return exitCode;
}
// Handle some known, case-sensitive shebang templates
const wchar_t *command;
int commandLength;
static const wchar_t *shebangTemplates[] = {
L"/usr/bin/env ",
L"/usr/bin/",
L"/usr/local/bin/",
L"",
NULL
};
for (const wchar_t **tmpl = shebangTemplates; *tmpl; ++tmpl) {
if (_shebangStartsWith(shebang, shebangLength, *tmpl, &command)) {
commandLength = 0;
while (command[commandLength] && !isspace(command[commandLength])) {
commandLength += 1;
}
if (!commandLength) {
} else if (_findCommand(search, command, commandLength)) {
search->executableArgs = &command[commandLength];
search->executableArgsLength = shebangLength - commandLength;
debug(L"# Treating shebang command '%.*s' as %s\n",
commandLength, command, search->executablePath);
} else if (_shebangStartsWith(command, commandLength, L"python", NULL)) {