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mingw: help debugging by optionally executing bash with strace
[git/debian.git] / compat / mingw.c
blob178a70df61fd2417de7fc0aeb4b8019f27b9536f
1 #include "../git-compat-util.h"
2 #include "win32.h"
3 #include <conio.h>
4 #include <wchar.h>
5 #include "../strbuf.h"
6 #include "../run-command.h"
7 #include "../cache.h"
8 #include "win32/lazyload.h"
9 #include "../config.h"
10 #include "dir.h"
11
12 #define HCAST(type, handle) ((type)(intptr_t)handle)
13
14 static const int delay[] = { 0, 1, 10, 20, 40 };
15
16 void open_in_gdb(void)
17 {
18 static struct child_process cp = CHILD_PROCESS_INIT;
19 extern char *_pgmptr;
20
21 argv_array_pushl(&cp.args, "mintty", "gdb", NULL);
22 argv_array_pushf(&cp.args, "--pid=%d", getpid());
23 cp.clean_on_exit = 1;
24 if (start_command(&cp) < 0)
25 die_errno("Could not start gdb");
26 sleep(1);
27 }
28
29 int err_win_to_posix(DWORD winerr)
30 {
31 int error = ENOSYS;
32 switch(winerr) {
33 case ERROR_ACCESS_DENIED: error = EACCES; break;
34 case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
35 case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
36 case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
37 case ERROR_ALREADY_EXISTS: error = EEXIST; break;
38 case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
39 case ERROR_BAD_COMMAND: error = EIO; break;
40 case ERROR_BAD_DEVICE: error = ENODEV; break;
41 case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
42 case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
43 case ERROR_BAD_FORMAT: error = ENOEXEC; break;
44 case ERROR_BAD_LENGTH: error = EINVAL; break;
45 case ERROR_BAD_PATHNAME: error = ENOENT; break;
46 case ERROR_BAD_PIPE: error = EPIPE; break;
47 case ERROR_BAD_UNIT: error = ENODEV; break;
48 case ERROR_BAD_USERNAME: error = EINVAL; break;
49 case ERROR_BROKEN_PIPE: error = EPIPE; break;
50 case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
51 case ERROR_BUSY: error = EBUSY; break;
52 case ERROR_BUSY_DRIVE: error = EBUSY; break;
53 case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
54 case ERROR_CANNOT_MAKE: error = EACCES; break;
55 case ERROR_CANTOPEN: error = EIO; break;
56 case ERROR_CANTREAD: error = EIO; break;
57 case ERROR_CANTWRITE: error = EIO; break;
58 case ERROR_CRC: error = EIO; break;
59 case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
60 case ERROR_DEVICE_IN_USE: error = EBUSY; break;
61 case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
62 case ERROR_DIRECTORY: error = EINVAL; break;
63 case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
64 case ERROR_DISK_CHANGE: error = EIO; break;
65 case ERROR_DISK_FULL: error = ENOSPC; break;
66 case ERROR_DRIVE_LOCKED: error = EBUSY; break;
67 case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
68 case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
69 case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
70 case ERROR_FILE_EXISTS: error = EEXIST; break;
71 case ERROR_FILE_INVALID: error = ENODEV; break;
72 case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
73 case ERROR_GEN_FAILURE: error = EIO; break;
74 case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
75 case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
76 case ERROR_INVALID_ACCESS: error = EACCES; break;
77 case ERROR_INVALID_ADDRESS: error = EFAULT; break;
78 case ERROR_INVALID_BLOCK: error = EFAULT; break;
79 case ERROR_INVALID_DATA: error = EINVAL; break;
80 case ERROR_INVALID_DRIVE: error = ENODEV; break;
81 case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
82 case ERROR_INVALID_FLAGS: error = EINVAL; break;
83 case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
84 case ERROR_INVALID_HANDLE: error = EBADF; break;
85 case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
86 case ERROR_INVALID_NAME: error = EINVAL; break;
87 case ERROR_INVALID_OWNER: error = EINVAL; break;
88 case ERROR_INVALID_PARAMETER: error = EINVAL; break;
89 case ERROR_INVALID_PASSWORD: error = EPERM; break;
90 case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
91 case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
92 case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
93 case ERROR_INVALID_WORKSTATION: error = EACCES; break;
94 case ERROR_IO_DEVICE: error = EIO; break;
95 case ERROR_IO_INCOMPLETE: error = EINTR; break;
96 case ERROR_LOCKED: error = EBUSY; break;
97 case ERROR_LOCK_VIOLATION: error = EACCES; break;
98 case ERROR_LOGON_FAILURE: error = EACCES; break;
99 case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
100 case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
101 case ERROR_MORE_DATA: error = EPIPE; break;
102 case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
103 case ERROR_NOACCESS: error = EFAULT; break;
104 case ERROR_NONE_MAPPED: error = EINVAL; break;
105 case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
106 case ERROR_NOT_READY: error = EAGAIN; break;
107 case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
108 case ERROR_NO_DATA: error = EPIPE; break;
109 case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
110 case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
111 case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
112 case ERROR_OPEN_FAILED: error = EIO; break;
113 case ERROR_OPEN_FILES: error = EBUSY; break;
114 case ERROR_OPERATION_ABORTED: error = EINTR; break;
115 case ERROR_OUTOFMEMORY: error = ENOMEM; break;
116 case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
117 case ERROR_PATH_BUSY: error = EBUSY; break;
118 case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
119 case ERROR_PIPE_BUSY: error = EBUSY; break;
120 case ERROR_PIPE_CONNECTED: error = EPIPE; break;
121 case ERROR_PIPE_LISTENING: error = EPIPE; break;
122 case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
123 case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
124 case ERROR_READ_FAULT: error = EIO; break;
125 case ERROR_SEEK: error = EIO; break;
126 case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
127 case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
128 case ERROR_SHARING_VIOLATION: error = EACCES; break;
129 case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
130 case ERROR_SUCCESS: BUG("err_win_to_posix() called without an error!");
131 case ERROR_SWAPERROR: error = ENOENT; break;
132 case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
133 case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
134 case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
135 case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
136 case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
137 case ERROR_WRITE_FAULT: error = EIO; break;
138 case ERROR_WRITE_PROTECT: error = EROFS; break;
139 }
140 return error;
141 }
142
143 static inline int is_file_in_use_error(DWORD errcode)
144 {
145 switch (errcode) {
146 case ERROR_SHARING_VIOLATION:
147 case ERROR_ACCESS_DENIED:
148 return 1;
149 }
150
151 return 0;
152 }
153
154 static int read_yes_no_answer(void)
155 {
156 char answer[1024];
157
158 if (fgets(answer, sizeof(answer), stdin)) {
159 size_t answer_len = strlen(answer);
160 int got_full_line = 0, c;
161
162 /* remove the newline */
163 if (answer_len >= 2 && answer[answer_len-2] == '\r') {
164 answer[answer_len-2] = '\0';
165 got_full_line = 1;
166 } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
167 answer[answer_len-1] = '\0';
168 got_full_line = 1;
169 }
170 /* flush the buffer in case we did not get the full line */
171 if (!got_full_line)
172 while ((c = getchar()) != EOF && c != '\n')
173 ;
174 } else
175 /* we could not read, return the
176 * default answer which is no */
177 return 0;
178
179 if (tolower(answer[0]) == 'y' && !answer[1])
180 return 1;
181 if (!strncasecmp(answer, "yes", sizeof(answer)))
182 return 1;
183 if (tolower(answer[0]) == 'n' && !answer[1])
184 return 0;
185 if (!strncasecmp(answer, "no", sizeof(answer)))
186 return 0;
187
188 /* did not find an answer we understand */
189 return -1;
190 }
191
192 static int ask_yes_no_if_possible(const char *format, ...)
193 {
194 char question[4096];
195 const char *retry_hook[] = { NULL, NULL, NULL };
196 va_list args;
197
198 va_start(args, format);
199 vsnprintf(question, sizeof(question), format, args);
200 va_end(args);
201
202 if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) {
203 retry_hook[1] = question;
204 return !run_command_v_opt(retry_hook, 0);
205 }
206
207 if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
208 return 0;
209
210 while (1) {
211 int answer;
212 fprintf(stderr, "%s (y/n) ", question);
213
214 if ((answer = read_yes_no_answer()) >= 0)
215 return answer;
216
217 fprintf(stderr, "Sorry, I did not understand your answer. "
218 "Please type 'y' or 'n'\n");
219 }
220 }
221
222 /* Windows only */
223 enum hide_dotfiles_type {
224 HIDE_DOTFILES_FALSE = 0,
225 HIDE_DOTFILES_TRUE,
226 HIDE_DOTFILES_DOTGITONLY
227 };
228
229 static int core_restrict_inherited_handles = -1;
230 static enum hide_dotfiles_type hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
231 static char *unset_environment_variables;
232
233 int mingw_core_config(const char *var, const char *value, void *cb)
234 {
235 if (!strcmp(var, "core.hidedotfiles")) {
236 if (value && !strcasecmp(value, "dotgitonly"))
237 hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
238 else
239 hide_dotfiles = git_config_bool(var, value);
240 return 0;
241 }
242
243 if (!strcmp(var, "core.unsetenvvars")) {
244 free(unset_environment_variables);
245 unset_environment_variables = xstrdup(value);
246 return 0;
247 }
248
249 if (!strcmp(var, "core.restrictinheritedhandles")) {
250 if (value && !strcasecmp(value, "auto"))
251 core_restrict_inherited_handles = -1;
252 else
253 core_restrict_inherited_handles =
254 git_config_bool(var, value);
255 return 0;
256 }
257
258 return 0;
259 }
260
261 /* Normalizes NT paths as returned by some low-level APIs. */
262 static wchar_t *normalize_ntpath(wchar_t *wbuf)
263 {
264 int i;
265 /* fix absolute path prefixes */
266 if (wbuf[0] == '\\') {
267 /* strip NT namespace prefixes */
268 if (!wcsncmp(wbuf, L"\\??\\", 4) ||
269 !wcsncmp(wbuf, L"\\\\?\\", 4))
270 wbuf += 4;
271 else if (!wcsnicmp(wbuf, L"\\DosDevices\\", 12))
272 wbuf += 12;
273 /* replace remaining '...UNC\' with '\\' */
274 if (!wcsnicmp(wbuf, L"UNC\\", 4)) {
275 wbuf += 2;
276 *wbuf = '\\';
277 }
278 }
279 /* convert backslashes to slashes */
280 for (i = 0; wbuf[i]; i++)
281 if (wbuf[i] == '\\')
282 wbuf[i] = '/';
283 return wbuf;
284 }
285
286 int mingw_unlink(const char *pathname)
287 {
288 int ret, tries = 0;
289 wchar_t wpathname[MAX_PATH];
290 if (xutftowcs_path(wpathname, pathname) < 0)
291 return -1;
292
293 /* read-only files cannot be removed */
294 _wchmod(wpathname, 0666);
295 while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
296 if (!is_file_in_use_error(GetLastError()))
297 break;
298 /*
299 * We assume that some other process had the source or
300 * destination file open at the wrong moment and retry.
301 * In order to give the other process a higher chance to
302 * complete its operation, we give up our time slice now.
303 * If we have to retry again, we do sleep a bit.
304 */
305 Sleep(delay[tries]);
306 tries++;
307 }
308 while (ret == -1 && is_file_in_use_error(GetLastError()) &&
309 ask_yes_no_if_possible("Unlink of file '%s' failed. "
310 "Should I try again?", pathname))
311 ret = _wunlink(wpathname);
312 return ret;
313 }
314
315 static int is_dir_empty(const wchar_t *wpath)
316 {
317 WIN32_FIND_DATAW findbuf;
318 HANDLE handle;
319 wchar_t wbuf[MAX_PATH + 2];
320 wcscpy(wbuf, wpath);
321 wcscat(wbuf, L"\\*");
322 handle = FindFirstFileW(wbuf, &findbuf);
323 if (handle == INVALID_HANDLE_VALUE)
324 return GetLastError() == ERROR_NO_MORE_FILES;
325
326 while (!wcscmp(findbuf.cFileName, L".") ||
327 !wcscmp(findbuf.cFileName, L".."))
328 if (!FindNextFileW(handle, &findbuf)) {
329 DWORD err = GetLastError();
330 FindClose(handle);
331 return err == ERROR_NO_MORE_FILES;
332 }
333 FindClose(handle);
334 return 0;
335 }
336
337 int mingw_rmdir(const char *pathname)
338 {
339 int ret, tries = 0;
340 wchar_t wpathname[MAX_PATH];
341 if (xutftowcs_path(wpathname, pathname) < 0)
342 return -1;
343
344 while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
345 if (!is_file_in_use_error(GetLastError()))
346 errno = err_win_to_posix(GetLastError());
347 if (errno != EACCES)
348 break;
349 if (!is_dir_empty(wpathname)) {
350 errno = ENOTEMPTY;
351 break;
352 }
353 /*
354 * We assume that some other process had the source or
355 * destination file open at the wrong moment and retry.
356 * In order to give the other process a higher chance to
357 * complete its operation, we give up our time slice now.
358 * If we have to retry again, we do sleep a bit.
359 */
360 Sleep(delay[tries]);
361 tries++;
362 }
363 while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
364 ask_yes_no_if_possible("Deletion of directory '%s' failed. "
365 "Should I try again?", pathname))
366 ret = _wrmdir(wpathname);
367 return ret;
368 }
369
370 static inline int needs_hiding(const char *path)
371 {
372 const char *basename;
373
374 if (hide_dotfiles == HIDE_DOTFILES_FALSE)
375 return 0;
376
377 /* We cannot use basename(), as it would remove trailing slashes */
378 win32_skip_dos_drive_prefix((char **)&path);
379 if (!*path)
380 return 0;
381
382 for (basename = path; *path; path++)
383 if (is_dir_sep(*path)) {
384 do {
385 path++;
386 } while (is_dir_sep(*path));
387 /* ignore trailing slashes */
388 if (*path)
389 basename = path;
390 else
391 break;
392 }
393
394 if (hide_dotfiles == HIDE_DOTFILES_TRUE)
395 return *basename == '.';
396
397 assert(hide_dotfiles == HIDE_DOTFILES_DOTGITONLY);
398 return !strncasecmp(".git", basename, 4) &&
399 (!basename[4] || is_dir_sep(basename[4]));
400 }
401
402 static int set_hidden_flag(const wchar_t *path, int set)
403 {
404 DWORD original = GetFileAttributesW(path), modified;
405 if (set)
406 modified = original | FILE_ATTRIBUTE_HIDDEN;
407 else
408 modified = original & ~FILE_ATTRIBUTE_HIDDEN;
409 if (original == modified || SetFileAttributesW(path, modified))
410 return 0;
411 errno = err_win_to_posix(GetLastError());
412 return -1;
413 }
414
415 int mingw_mkdir(const char *path, int mode)
416 {
417 int ret;
418 wchar_t wpath[MAX_PATH];
419
420 if (!is_valid_win32_path(path, 0)) {
421 errno = EINVAL;
422 return -1;
423 }
424
425 if (xutftowcs_path(wpath, path) < 0)
426 return -1;
427 ret = _wmkdir(wpath);
428 if (!ret && needs_hiding(path))
429 return set_hidden_flag(wpath, 1);
430 return ret;
431 }
432
433 /*
434 * Calling CreateFile() using FILE_APPEND_DATA and without FILE_WRITE_DATA
435 * is documented in [1] as opening a writable file handle in append mode.
436 * (It is believed that) this is atomic since it is maintained by the
437 * kernel unlike the O_APPEND flag which is racily maintained by the CRT.
438 *
439 * [1] https://docs.microsoft.com/en-us/windows/desktop/fileio/file-access-rights-constants
440 *
441 * This trick does not appear to work for named pipes. Instead it creates
442 * a named pipe client handle that cannot be written to. Callers should
443 * just use the regular _wopen() for them. (And since client handle gets
444 * bound to a unique server handle, it isn't really an issue.)
445 */
446 static int mingw_open_append(wchar_t const *wfilename, int oflags, ...)
447 {
448 HANDLE handle;
449 int fd;
450 DWORD create = (oflags & O_CREAT) ? OPEN_ALWAYS : OPEN_EXISTING;
451
452 /* only these flags are supported */
453 if ((oflags & ~O_CREAT) != (O_WRONLY | O_APPEND))
454 return errno = ENOSYS, -1;
455
456 /*
457 * FILE_SHARE_WRITE is required to permit child processes
458 * to append to the file.
459 */
460 handle = CreateFileW(wfilename, FILE_APPEND_DATA,
461 FILE_SHARE_WRITE | FILE_SHARE_READ,
462 NULL, create, FILE_ATTRIBUTE_NORMAL, NULL);
463 if (handle == INVALID_HANDLE_VALUE)
464 return errno = err_win_to_posix(GetLastError()), -1;
465
466 /*
467 * No O_APPEND here, because the CRT uses it only to reset the
468 * file pointer to EOF before each write(); but that is not
469 * necessary (and may lead to races) for a file created with
470 * FILE_APPEND_DATA.
471 */
472 fd = _open_osfhandle((intptr_t)handle, O_BINARY);
473 if (fd < 0)
474 CloseHandle(handle);
475 return fd;
476 }
477
478 /*
479 * Does the pathname map to the local named pipe filesystem?
480 * That is, does it have a "//./pipe/" prefix?
481 */
482 static int is_local_named_pipe_path(const char *filename)
483 {
484 return (is_dir_sep(filename[0]) &&
485 is_dir_sep(filename[1]) &&
486 filename[2] == '.' &&
487 is_dir_sep(filename[3]) &&
488 !strncasecmp(filename+4, "pipe", 4) &&
489 is_dir_sep(filename[8]) &&
490 filename[9]);
491 }
492
493 int mingw_open (const char *filename, int oflags, ...)
494 {
495 typedef int (*open_fn_t)(wchar_t const *wfilename, int oflags, ...);
496 va_list args;
497 unsigned mode;
498 int fd, create = (oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL);
499 wchar_t wfilename[MAX_PATH];
500 open_fn_t open_fn;
501
502 va_start(args, oflags);
503 mode = va_arg(args, int);
504 va_end(args);
505
506 if (!is_valid_win32_path(filename, !create)) {
507 errno = create ? EINVAL : ENOENT;
508 return -1;
509 }
510
511 if ((oflags & O_APPEND) && !is_local_named_pipe_path(filename))
512 open_fn = mingw_open_append;
513 else
514 open_fn = _wopen;
515
516 if (filename && !strcmp(filename, "/dev/null"))
517 wcscpy(wfilename, L"nul");
518 else if (xutftowcs_path(wfilename, filename) < 0)
519 return -1;
520
521 fd = open_fn(wfilename, oflags, mode);
522
523 if (fd < 0 && (oflags & O_ACCMODE) != O_RDONLY && errno == EACCES) {
524 DWORD attrs = GetFileAttributesW(wfilename);
525 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
526 errno = EISDIR;
527 }
528 if ((oflags & O_CREAT) && needs_hiding(filename)) {
529 /*
530 * Internally, _wopen() uses the CreateFile() API which errors
531 * out with an ERROR_ACCESS_DENIED if CREATE_ALWAYS was
532 * specified and an already existing file's attributes do not
533 * match *exactly*. As there is no mode or flag we can set that
534 * would correspond to FILE_ATTRIBUTE_HIDDEN, let's just try
535 * again *without* the O_CREAT flag (that corresponds to the
536 * CREATE_ALWAYS flag of CreateFile()).
537 */
538 if (fd < 0 && errno == EACCES)
539 fd = open_fn(wfilename, oflags & ~O_CREAT, mode);
540 if (fd >= 0 && set_hidden_flag(wfilename, 1))
541 warning("could not mark '%s' as hidden.", filename);
542 }
543 return fd;
544 }
545
546 static BOOL WINAPI ctrl_ignore(DWORD type)
547 {
548 return TRUE;
549 }
550
551 #undef fgetc
552 int mingw_fgetc(FILE *stream)
553 {
554 int ch;
555 if (!isatty(_fileno(stream)))
556 return fgetc(stream);
557
558 SetConsoleCtrlHandler(ctrl_ignore, TRUE);
559 while (1) {
560 ch = fgetc(stream);
561 if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
562 break;
563
564 /* Ctrl+C was pressed, simulate SIGINT and retry */
565 mingw_raise(SIGINT);
566 }
567 SetConsoleCtrlHandler(ctrl_ignore, FALSE);
568 return ch;
569 }
570
571 #undef fopen
572 FILE *mingw_fopen (const char *filename, const char *otype)
573 {
574 int hide = needs_hiding(filename);
575 FILE *file;
576 wchar_t wfilename[MAX_PATH], wotype[4];
577 if (filename && !strcmp(filename, "/dev/null"))
578 wcscpy(wfilename, L"nul");
579 else if (!is_valid_win32_path(filename, 1)) {
580 int create = otype && strchr(otype, 'w');
581 errno = create ? EINVAL : ENOENT;
582 return NULL;
583 } else if (xutftowcs_path(wfilename, filename) < 0)
584 return NULL;
585
586 if (xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
587 return NULL;
588
589 if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
590 error("could not unhide %s", filename);
591 return NULL;
592 }
593 file = _wfopen(wfilename, wotype);
594 if (!file && GetLastError() == ERROR_INVALID_NAME)
595 errno = ENOENT;
596 if (file && hide && set_hidden_flag(wfilename, 1))
597 warning("could not mark '%s' as hidden.", filename);
598 return file;
599 }
600
601 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
602 {
603 int hide = needs_hiding(filename);
604 FILE *file;
605 wchar_t wfilename[MAX_PATH], wotype[4];
606 if (filename && !strcmp(filename, "/dev/null"))
607 wcscpy(wfilename, L"nul");
608 else if (!is_valid_win32_path(filename, 1)) {
609 int create = otype && strchr(otype, 'w');
610 errno = create ? EINVAL : ENOENT;
611 return NULL;
612 } else if (xutftowcs_path(wfilename, filename) < 0)
613 return NULL;
614
615 if (xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
616 return NULL;
617
618 if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
619 error("could not unhide %s", filename);
620 return NULL;
621 }
622 file = _wfreopen(wfilename, wotype, stream);
623 if (file && hide && set_hidden_flag(wfilename, 1))
624 warning("could not mark '%s' as hidden.", filename);
625 return file;
626 }
627
628 #undef fflush
629 int mingw_fflush(FILE *stream)
630 {
631 int ret = fflush(stream);
632
633 /*
634 * write() is used behind the scenes of stdio output functions.
635 * Since git code does not check for errors after each stdio write
636 * operation, it can happen that write() is called by a later
637 * stdio function even if an earlier write() call failed. In the
638 * case of a pipe whose readable end was closed, only the first
639 * call to write() reports EPIPE on Windows. Subsequent write()
640 * calls report EINVAL. It is impossible to notice whether this
641 * fflush invocation triggered such a case, therefore, we have to
642 * catch all EINVAL errors whole-sale.
643 */
644 if (ret && errno == EINVAL)
645 errno = EPIPE;
646
647 return ret;
648 }
649
650 #undef write
651 ssize_t mingw_write(int fd, const void *buf, size_t len)
652 {
653 ssize_t result = write(fd, buf, len);
654
655 if (result < 0 && errno == EINVAL && buf) {
656 /* check if fd is a pipe */
657 HANDLE h = (HANDLE) _get_osfhandle(fd);
658 if (GetFileType(h) == FILE_TYPE_PIPE)
659 errno = EPIPE;
660 else
661 errno = EINVAL;
662 }
663
664 return result;
665 }
666
667 int mingw_access(const char *filename, int mode)
668 {
669 wchar_t wfilename[MAX_PATH];
670 if (xutftowcs_path(wfilename, filename) < 0)
671 return -1;
672 /* X_OK is not supported by the MSVCRT version */
673 return _waccess(wfilename, mode & ~X_OK);
674 }
675
676 int mingw_chdir(const char *dirname)
677 {
678 wchar_t wdirname[MAX_PATH];
679 if (xutftowcs_path(wdirname, dirname) < 0)
680 return -1;
681 return _wchdir(wdirname);
682 }
683
684 int mingw_chmod(const char *filename, int mode)
685 {
686 wchar_t wfilename[MAX_PATH];
687 if (xutftowcs_path(wfilename, filename) < 0)
688 return -1;
689 return _wchmod(wfilename, mode);
690 }
691
692 /*
693 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
694 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
695 */
696 static inline long long filetime_to_hnsec(const FILETIME *ft)
697 {
698 long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
699 /* Windows to Unix Epoch conversion */
700 return winTime - 116444736000000000LL;
701 }
702
703 static inline void filetime_to_timespec(const FILETIME *ft, struct timespec *ts)
704 {
705 long long hnsec = filetime_to_hnsec(ft);
706 ts->tv_sec = (time_t)(hnsec / 10000000);
707 ts->tv_nsec = (hnsec % 10000000) * 100;
708 }
709
710 /**
711 * Verifies that safe_create_leading_directories() would succeed.
712 */
713 static int has_valid_directory_prefix(wchar_t *wfilename)
714 {
715 int n = wcslen(wfilename);
716
717 while (n > 0) {
718 wchar_t c = wfilename[--n];
719 DWORD attributes;
720
721 if (!is_dir_sep(c))
722 continue;
723
724 wfilename[n] = L'\0';
725 attributes = GetFileAttributesW(wfilename);
726 wfilename[n] = c;
727 if (attributes == FILE_ATTRIBUTE_DIRECTORY ||
728 attributes == FILE_ATTRIBUTE_DEVICE)
729 return 1;
730 if (attributes == INVALID_FILE_ATTRIBUTES)
731 switch (GetLastError()) {
732 case ERROR_PATH_NOT_FOUND:
733 continue;
734 case ERROR_FILE_NOT_FOUND:
735 /* This implies parent directory exists. */
736 return 1;
737 }
738 return 0;
739 }
740 return 1;
741 }
742
743 /* We keep the do_lstat code in a separate function to avoid recursion.
744 * When a path ends with a slash, the stat will fail with ENOENT. In
745 * this case, we strip the trailing slashes and stat again.
746 *
747 * If follow is true then act like stat() and report on the link
748 * target. Otherwise report on the link itself.
749 */
750 static int do_lstat(int follow, const char *file_name, struct stat *buf)
751 {
752 WIN32_FILE_ATTRIBUTE_DATA fdata;
753 wchar_t wfilename[MAX_PATH];
754 if (xutftowcs_path(wfilename, file_name) < 0)
755 return -1;
756
757 if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
758 buf->st_ino = 0;
759 buf->st_gid = 0;
760 buf->st_uid = 0;
761 buf->st_nlink = 1;
762 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
763 buf->st_size = fdata.nFileSizeLow |
764 (((off_t)fdata.nFileSizeHigh)<<32);
765 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
766 filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim));
767 filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim));
768 filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim));
769 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
770 WIN32_FIND_DATAW findbuf;
771 HANDLE handle = FindFirstFileW(wfilename, &findbuf);
772 if (handle != INVALID_HANDLE_VALUE) {
773 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
774 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
775 if (follow) {
776 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
777 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
778 } else {
779 buf->st_mode = S_IFLNK;
780 }
781 buf->st_mode |= S_IREAD;
782 if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
783 buf->st_mode |= S_IWRITE;
784 }
785 FindClose(handle);
786 }
787 }
788 return 0;
789 }
790 switch (GetLastError()) {
791 case ERROR_ACCESS_DENIED:
792 case ERROR_SHARING_VIOLATION:
793 case ERROR_LOCK_VIOLATION:
794 case ERROR_SHARING_BUFFER_EXCEEDED:
795 errno = EACCES;
796 break;
797 case ERROR_BUFFER_OVERFLOW:
798 errno = ENAMETOOLONG;
799 break;
800 case ERROR_NOT_ENOUGH_MEMORY:
801 errno = ENOMEM;
802 break;
803 case ERROR_PATH_NOT_FOUND:
804 if (!has_valid_directory_prefix(wfilename)) {
805 errno = ENOTDIR;
806 break;
807 }
808 /* fallthru */
809 default:
810 errno = ENOENT;
811 break;
812 }
813 return -1;
814 }
815
816 /* We provide our own lstat/fstat functions, since the provided
817 * lstat/fstat functions are so slow. These stat functions are
818 * tailored for Git's usage (read: fast), and are not meant to be
819 * complete. Note that Git stat()s are redirected to mingw_lstat()
820 * too, since Windows doesn't really handle symlinks that well.
821 */
822 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
823 {
824 int namelen;
825 char alt_name[PATH_MAX];
826
827 if (!do_lstat(follow, file_name, buf))
828 return 0;
829
830 /* if file_name ended in a '/', Windows returned ENOENT;
831 * try again without trailing slashes
832 */
833 if (errno != ENOENT)
834 return -1;
835
836 namelen = strlen(file_name);
837 if (namelen && file_name[namelen-1] != '/')
838 return -1;
839 while (namelen && file_name[namelen-1] == '/')
840 --namelen;
841 if (!namelen || namelen >= PATH_MAX)
842 return -1;
843
844 memcpy(alt_name, file_name, namelen);
845 alt_name[namelen] = 0;
846 return do_lstat(follow, alt_name, buf);
847 }
848
849 static int get_file_info_by_handle(HANDLE hnd, struct stat *buf)
850 {
851 BY_HANDLE_FILE_INFORMATION fdata;
852
853 if (!GetFileInformationByHandle(hnd, &fdata)) {
854 errno = err_win_to_posix(GetLastError());
855 return -1;
856 }
857
858 buf->st_ino = 0;
859 buf->st_gid = 0;
860 buf->st_uid = 0;
861 buf->st_nlink = 1;
862 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
863 buf->st_size = fdata.nFileSizeLow |
864 (((off_t)fdata.nFileSizeHigh)<<32);
865 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
866 filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim));
867 filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim));
868 filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim));
869 return 0;
870 }
871
872 int mingw_lstat(const char *file_name, struct stat *buf)
873 {
874 return do_stat_internal(0, file_name, buf);
875 }
876 int mingw_stat(const char *file_name, struct stat *buf)
877 {
878 return do_stat_internal(1, file_name, buf);
879 }
880
881 int mingw_fstat(int fd, struct stat *buf)
882 {
883 HANDLE fh = (HANDLE)_get_osfhandle(fd);
884 DWORD avail, type = GetFileType(fh) & ~FILE_TYPE_REMOTE;
885
886 switch (type) {
887 case FILE_TYPE_DISK:
888 return get_file_info_by_handle(fh, buf);
889
890 case FILE_TYPE_CHAR:
891 case FILE_TYPE_PIPE:
892 /* initialize stat fields */
893 memset(buf, 0, sizeof(*buf));
894 buf->st_nlink = 1;
895
896 if (type == FILE_TYPE_CHAR) {
897 buf->st_mode = _S_IFCHR;
898 } else {
899 buf->st_mode = _S_IFIFO;
900 if (PeekNamedPipe(fh, NULL, 0, NULL, &avail, NULL))
901 buf->st_size = avail;
902 }
903 return 0;
904
905 default:
906 errno = EBADF;
907 return -1;
908 }
909 }
910
911 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
912 {
913 long long winTime = t * 10000000LL + 116444736000000000LL;
914 ft->dwLowDateTime = winTime;
915 ft->dwHighDateTime = winTime >> 32;
916 }
917
918 int mingw_utime (const char *file_name, const struct utimbuf *times)
919 {
920 FILETIME mft, aft;
921 int fh, rc;
922 DWORD attrs;
923 wchar_t wfilename[MAX_PATH];
924 if (xutftowcs_path(wfilename, file_name) < 0)
925 return -1;
926
927 /* must have write permission */
928 attrs = GetFileAttributesW(wfilename);
929 if (attrs != INVALID_FILE_ATTRIBUTES &&
930 (attrs & FILE_ATTRIBUTE_READONLY)) {
931 /* ignore errors here; open() will report them */
932 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
933 }
934
935 if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
936 rc = -1;
937 goto revert_attrs;
938 }
939
940 if (times) {
941 time_t_to_filetime(times->modtime, &mft);
942 time_t_to_filetime(times->actime, &aft);
943 } else {
944 GetSystemTimeAsFileTime(&mft);
945 aft = mft;
946 }
947 if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
948 errno = EINVAL;
949 rc = -1;
950 } else
951 rc = 0;
952 close(fh);
953
954 revert_attrs:
955 if (attrs != INVALID_FILE_ATTRIBUTES &&
956 (attrs & FILE_ATTRIBUTE_READONLY)) {
957 /* ignore errors again */
958 SetFileAttributesW(wfilename, attrs);
959 }
960 return rc;
961 }
962
963 #undef strftime
964 size_t mingw_strftime(char *s, size_t max,
965 const char *format, const struct tm *tm)
966 {
967 /* a pointer to the original strftime in case we can't find the UCRT version */
968 static size_t (*fallback)(char *, size_t, const char *, const struct tm *) = strftime;
969 size_t ret;
970 DECLARE_PROC_ADDR(ucrtbase.dll, size_t, strftime, char *, size_t,
971 const char *, const struct tm *);
972
973 if (INIT_PROC_ADDR(strftime))
974 ret = strftime(s, max, format, tm);
975 else
976 ret = fallback(s, max, format, tm);
977
978 if (!ret && errno == EINVAL)
979 die("invalid strftime format: '%s'", format);
980 return ret;
981 }
982
983 unsigned int sleep (unsigned int seconds)
984 {
985 Sleep(seconds*1000);
986 return 0;
987 }
988
989 char *mingw_mktemp(char *template)
990 {
991 wchar_t wtemplate[MAX_PATH];
992 if (xutftowcs_path(wtemplate, template) < 0)
993 return NULL;
994 if (!_wmktemp(wtemplate))
995 return NULL;
996 if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
997 return NULL;
998 return template;
999 }
1000
1001 int mkstemp(char *template)
1002 {
1003 char *filename = mktemp(template);
1004 if (filename == NULL)
1005 return -1;
1006 return open(filename, O_RDWR | O_CREAT, 0600);
1007 }
1008
1009 int gettimeofday(struct timeval *tv, void *tz)
1010 {
1011 FILETIME ft;
1012 long long hnsec;
1013
1014 GetSystemTimeAsFileTime(&ft);
1015 hnsec = filetime_to_hnsec(&ft);
1016 tv->tv_sec = hnsec / 10000000;
1017 tv->tv_usec = (hnsec % 10000000) / 10;
1018 return 0;
1019 }
1020
1021 int pipe(int filedes[2])
1022 {
1023 HANDLE h[2];
1024
1025 /* this creates non-inheritable handles */
1026 if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
1027 errno = err_win_to_posix(GetLastError());
1028 return -1;
1029 }
1030 filedes[0] = _open_osfhandle(HCAST(int, h[0]), O_NOINHERIT);
1031 if (filedes[0] < 0) {
1032 CloseHandle(h[0]);
1033 CloseHandle(h[1]);
1034 return -1;
1035 }
1036 filedes[1] = _open_osfhandle(HCAST(int, h[1]), O_NOINHERIT);
1037 if (filedes[1] < 0) {
1038 close(filedes[0]);
1039 CloseHandle(h[1]);
1040 return -1;
1041 }
1042 return 0;
1043 }
1044
1045 struct tm *gmtime_r(const time_t *timep, struct tm *result)
1046 {
1047 if (gmtime_s(result, timep) == 0)
1048 return result;
1049 return NULL;
1050 }
1051
1052 struct tm *localtime_r(const time_t *timep, struct tm *result)
1053 {
1054 if (localtime_s(result, timep) == 0)
1055 return result;
1056 return NULL;
1057 }
1058
1059 char *mingw_getcwd(char *pointer, int len)
1060 {
1061 wchar_t cwd[MAX_PATH], wpointer[MAX_PATH];
1062 DWORD ret = GetCurrentDirectoryW(ARRAY_SIZE(cwd), cwd);
1063
1064 if (!ret || ret >= ARRAY_SIZE(cwd)) {
1065 errno = ret ? ENAMETOOLONG : err_win_to_posix(GetLastError());
1066 return NULL;
1067 }
1068 ret = GetLongPathNameW(cwd, wpointer, ARRAY_SIZE(wpointer));
1069 if (!ret && GetLastError() == ERROR_ACCESS_DENIED) {
1070 HANDLE hnd = CreateFileW(cwd, 0,
1071 FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL,
1072 OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
1073 if (hnd == INVALID_HANDLE_VALUE)
1074 return NULL;
1075 ret = GetFinalPathNameByHandleW(hnd, wpointer, ARRAY_SIZE(wpointer), 0);
1076 CloseHandle(hnd);
1077 if (!ret || ret >= ARRAY_SIZE(wpointer))
1078 return NULL;
1079 if (xwcstoutf(pointer, normalize_ntpath(wpointer), len) < 0)
1080 return NULL;
1081 return pointer;
1082 }
1083 if (!ret || ret >= ARRAY_SIZE(wpointer))
1084 return NULL;
1085 if (xwcstoutf(pointer, wpointer, len) < 0)
1086 return NULL;
1087 convert_slashes(pointer);
1088 return pointer;
1089 }
1090
1091 /*
1092 * See "Parsing C++ Command-Line Arguments" at Microsoft's Docs:
1093 * https://docs.microsoft.com/en-us/cpp/cpp/parsing-cpp-command-line-arguments
1094 */
1095 static const char *quote_arg_msvc(const char *arg)
1096 {
1097 /* count chars to quote */
1098 int len = 0, n = 0;
1099 int force_quotes = 0;
1100 char *q, *d;
1101 const char *p = arg;
1102 if (!*p) force_quotes = 1;
1103 while (*p) {
1104 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
1105 force_quotes = 1;
1106 else if (*p == '"')
1107 n++;
1108 else if (*p == '\\') {
1109 int count = 0;
1110 while (*p == '\\') {
1111 count++;
1112 p++;
1113 len++;
1114 }
1115 if (*p == '"' || !*p)
1116 n += count*2 + 1;
1117 continue;
1118 }
1119 len++;
1120 p++;
1121 }
1122 if (!force_quotes && n == 0)
1123 return arg;
1124
1125 /* insert \ where necessary */
1126 d = q = xmalloc(st_add3(len, n, 3));
1127 *d++ = '"';
1128 while (*arg) {
1129 if (*arg == '"')
1130 *d++ = '\\';
1131 else if (*arg == '\\') {
1132 int count = 0;
1133 while (*arg == '\\') {
1134 count++;
1135 *d++ = *arg++;
1136 }
1137 if (*arg == '"' || !*arg) {
1138 while (count-- > 0)
1139 *d++ = '\\';
1140 /* don't escape the surrounding end quote */
1141 if (!*arg)
1142 break;
1143 *d++ = '\\';
1144 }
1145 }
1146 *d++ = *arg++;
1147 }
1148 *d++ = '"';
1149 *d++ = '\0';
1150 return q;
1151 }
1152
1153 #include "quote.h"
1154
1155 static const char *quote_arg_msys2(const char *arg)
1156 {
1157 struct strbuf buf = STRBUF_INIT;
1158 const char *p2 = arg, *p;
1159
1160 for (p = arg; *p; p++) {
1161 int ws = isspace(*p);
1162 if (!ws && *p != '\\' && *p != '"' && *p != '{' && *p != '\'' &&
1163 *p != '?' && *p != '*' && *p != '~')
1164 continue;
1165 if (!buf.len)
1166 strbuf_addch(&buf, '"');
1167 if (p != p2)
1168 strbuf_add(&buf, p2, p - p2);
1169 if (*p == '\\' || *p == '"')
1170 strbuf_addch(&buf, '\\');
1171 p2 = p;
1172 }
1173
1174 if (p == arg)
1175 strbuf_addch(&buf, '"');
1176 else if (!buf.len)
1177 return arg;
1178 else
1179 strbuf_add(&buf, p2, p - p2);
1180
1181 strbuf_addch(&buf, '"');
1182 return strbuf_detach(&buf, 0);
1183 }
1184
1185 static const char *parse_interpreter(const char *cmd)
1186 {
1187 static char buf[100];
1188 char *p, *opt;
1189 int n, fd;
1190
1191 /* don't even try a .exe */
1192 n = strlen(cmd);
1193 if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
1194 return NULL;
1195
1196 fd = open(cmd, O_RDONLY);
1197 if (fd < 0)
1198 return NULL;
1199 n = read(fd, buf, sizeof(buf)-1);
1200 close(fd);
1201 if (n < 4) /* at least '#!/x' and not error */
1202 return NULL;
1203
1204 if (buf[0] != '#' || buf[1] != '!')
1205 return NULL;
1206 buf[n] = '\0';
1207 p = buf + strcspn(buf, "\r\n");
1208 if (!*p)
1209 return NULL;
1210
1211 *p = '\0';
1212 if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
1213 return NULL;
1214 /* strip options */
1215 if ((opt = strchr(p+1, ' ')))
1216 *opt = '\0';
1217 return p+1;
1218 }
1219
1220 /*
1221 * exe_only means that we only want to detect .exe files, but not scripts
1222 * (which do not have an extension)
1223 */
1224 static char *lookup_prog(const char *dir, int dirlen, const char *cmd,
1225 int isexe, int exe_only)
1226 {
1227 char path[MAX_PATH];
1228 wchar_t wpath[MAX_PATH];
1229 snprintf(path, sizeof(path), "%.*s\\%s.exe", dirlen, dir, cmd);
1230
1231 if (xutftowcs_path(wpath, path) < 0)
1232 return NULL;
1233
1234 if (!isexe && _waccess(wpath, F_OK) == 0)
1235 return xstrdup(path);
1236 wpath[wcslen(wpath)-4] = '\0';
1237 if ((!exe_only || isexe) && _waccess(wpath, F_OK) == 0) {
1238 if (!(GetFileAttributesW(wpath) & FILE_ATTRIBUTE_DIRECTORY)) {
1239 path[strlen(path)-4] = '\0';
1240 return xstrdup(path);
1241 }
1242 }
1243 return NULL;
1244 }
1245
1246 /*
1247 * Determines the absolute path of cmd using the split path in path.
1248 * If cmd contains a slash or backslash, no lookup is performed.
1249 */
1250 static char *path_lookup(const char *cmd, int exe_only)
1251 {
1252 const char *path;
1253 char *prog = NULL;
1254 int len = strlen(cmd);
1255 int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
1256
1257 if (strpbrk(cmd, "/\\"))
1258 return xstrdup(cmd);
1259
1260 path = mingw_getenv("PATH");
1261 if (!path)
1262 return NULL;
1263
1264 while (!prog) {
1265 const char *sep = strchrnul(path, ';');
1266 int dirlen = sep - path;
1267 if (dirlen)
1268 prog = lookup_prog(path, dirlen, cmd, isexe, exe_only);
1269 if (!*sep)
1270 break;
1271 path = sep + 1;
1272 }
1273
1274 return prog;
1275 }
1276
1277 static const wchar_t *wcschrnul(const wchar_t *s, wchar_t c)
1278 {
1279 while (*s && *s != c)
1280 s++;
1281 return s;
1282 }
1283
1284 /* Compare only keys */
1285 static int wenvcmp(const void *a, const void *b)
1286 {
1287 wchar_t *p = *(wchar_t **)a, *q = *(wchar_t **)b;
1288 size_t p_len, q_len;
1289
1290 /* Find the keys */
1291 p_len = wcschrnul(p, L'=') - p;
1292 q_len = wcschrnul(q, L'=') - q;
1293
1294 /* If the length differs, include the shorter key's NUL */
1295 if (p_len < q_len)
1296 p_len++;
1297 else if (p_len > q_len)
1298 p_len = q_len + 1;
1299
1300 return _wcsnicmp(p, q, p_len);
1301 }
1302
1303 /*
1304 * Build an environment block combining the inherited environment
1305 * merged with the given list of settings.
1306 *
1307 * Values of the form "KEY=VALUE" in deltaenv override inherited values.
1308 * Values of the form "KEY" in deltaenv delete inherited values.
1309 *
1310 * Multiple entries in deltaenv for the same key are explicitly allowed.
1311 *
1312 * We return a contiguous block of UNICODE strings with a final trailing
1313 * zero word.
1314 */
1315 static wchar_t *make_environment_block(char **deltaenv)
1316 {
1317 wchar_t *wenv = GetEnvironmentStringsW(), *wdeltaenv, *result, *p;
1318 size_t wlen, s, delta_size, size;
1319
1320 wchar_t **array = NULL;
1321 size_t alloc = 0, nr = 0, i;
1322
1323 size = 1; /* for extra NUL at the end */
1324
1325 /* If there is no deltaenv to apply, simply return a copy. */
1326 if (!deltaenv || !*deltaenv) {
1327 for (p = wenv; p && *p; ) {
1328 size_t s = wcslen(p) + 1;
1329 size += s;
1330 p += s;
1331 }
1332
1333 ALLOC_ARRAY(result, size);
1334 COPY_ARRAY(result, wenv, size);
1335 FreeEnvironmentStringsW(wenv);
1336 return result;
1337 }
1338
1339 /*
1340 * If there is a deltaenv, let's accumulate all keys into `array`,
1341 * sort them using the stable git_stable_qsort() and then copy,
1342 * skipping duplicate keys
1343 */
1344 for (p = wenv; p && *p; ) {
1345 ALLOC_GROW(array, nr + 1, alloc);
1346 s = wcslen(p) + 1;
1347 array[nr++] = p;
1348 p += s;
1349 size += s;
1350 }
1351
1352 /* (over-)assess size needed for wchar version of deltaenv */
1353 for (delta_size = 0, i = 0; deltaenv[i]; i++)
1354 delta_size += strlen(deltaenv[i]) * 2 + 1;
1355 ALLOC_ARRAY(wdeltaenv, delta_size);
1356
1357 /* convert the deltaenv, appending to array */
1358 for (i = 0, p = wdeltaenv; deltaenv[i]; i++) {
1359 ALLOC_GROW(array, nr + 1, alloc);
1360 wlen = xutftowcs(p, deltaenv[i], wdeltaenv + delta_size - p);
1361 array[nr++] = p;
1362 p += wlen + 1;
1363 }
1364
1365 git_stable_qsort(array, nr, sizeof(*array), wenvcmp);
1366 ALLOC_ARRAY(result, size + delta_size);
1367
1368 for (p = result, i = 0; i < nr; i++) {
1369 /* Skip any duplicate keys; last one wins */
1370 while (i + 1 < nr && !wenvcmp(array + i, array + i + 1))
1371 i++;
1372
1373 /* Skip "to delete" entry */
1374 if (!wcschr(array[i], L'='))
1375 continue;
1376
1377 size = wcslen(array[i]) + 1;
1378 COPY_ARRAY(p, array[i], size);
1379 p += size;
1380 }
1381 *p = L'\0';
1382
1383 free(array);
1384 free(wdeltaenv);
1385 FreeEnvironmentStringsW(wenv);
1386 return result;
1387 }
1388
1389 static void do_unset_environment_variables(void)
1390 {
1391 static int done;
1392 char *p = unset_environment_variables;
1393
1394 if (done || !p)
1395 return;
1396 done = 1;
1397
1398 for (;;) {
1399 char *comma = strchr(p, ',');
1400
1401 if (comma)
1402 *comma = '\0';
1403 unsetenv(p);
1404 if (!comma)
1405 break;
1406 p = comma + 1;
1407 }
1408 }
1409
1410 struct pinfo_t {
1411 struct pinfo_t *next;
1412 pid_t pid;
1413 HANDLE proc;
1414 };
1415 static struct pinfo_t *pinfo = NULL;
1416 CRITICAL_SECTION pinfo_cs;
1417
1418 /* Used to match and chomp off path components */
1419 static inline int match_last_path_component(const char *path, size_t *len,
1420 const char *component)
1421 {
1422 size_t component_len = strlen(component);
1423 if (*len < component_len + 1 ||
1424 !is_dir_sep(path[*len - component_len - 1]) ||
1425 fspathncmp(path + *len - component_len, component, component_len))
1426 return 0;
1427 *len -= component_len + 1;
1428 /* chomp off repeated dir separators */
1429 while (*len > 0 && is_dir_sep(path[*len - 1]))
1430 (*len)--;
1431 return 1;
1432 }
1433
1434 static int is_msys2_sh(const char *cmd)
1435 {
1436 if (!cmd)
1437 return 0;
1438
1439 if (!strcmp(cmd, "sh")) {
1440 static int ret = -1;
1441 char *p;
1442
1443 if (ret >= 0)
1444 return ret;
1445
1446 p = path_lookup(cmd, 0);
1447 if (!p)
1448 ret = 0;
1449 else {
1450 size_t len = strlen(p);
1451
1452 ret = match_last_path_component(p, &len, "sh.exe") &&
1453 match_last_path_component(p, &len, "bin") &&
1454 match_last_path_component(p, &len, "usr");
1455 free(p);
1456 }
1457 return ret;
1458 }
1459
1460 if (ends_with(cmd, "\\sh.exe")) {
1461 static char *sh;
1462
1463 if (!sh)
1464 sh = path_lookup("sh", 0);
1465
1466 return !fspathcmp(cmd, sh);
1467 }
1468
1469 return 0;
1470 }
1471
1472 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1473 const char *dir,
1474 int prepend_cmd, int fhin, int fhout, int fherr)
1475 {
1476 static int restrict_handle_inheritance = -1;
1477 STARTUPINFOEXW si;
1478 PROCESS_INFORMATION pi;
1479 LPPROC_THREAD_ATTRIBUTE_LIST attr_list = NULL;
1480 HANDLE stdhandles[3];
1481 DWORD stdhandles_count = 0;
1482 SIZE_T size;
1483 struct strbuf args;
1484 wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1485 unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1486 BOOL ret;
1487 HANDLE cons;
1488 const char *(*quote_arg)(const char *arg) =
1489 is_msys2_sh(cmd ? cmd : *argv) ?
1490 quote_arg_msys2 : quote_arg_msvc;
1491 const char *strace_env;
1492
1493 /* Make sure to override previous errors, if any */
1494 errno = 0;
1495
1496 if (restrict_handle_inheritance < 0)
1497 restrict_handle_inheritance = core_restrict_inherited_handles;
1498 /*
1499 * The following code to restrict which handles are inherited seems
1500 * to work properly only on Windows 7 and later, so let's disable it
1501 * on Windows Vista and 2008.
1502 */
1503 if (restrict_handle_inheritance < 0)
1504 restrict_handle_inheritance = GetVersion() >> 16 >= 7601;
1505
1506 do_unset_environment_variables();
1507
1508 /* Determine whether or not we are associated to a console */
1509 cons = CreateFileW(L"CONOUT$", GENERIC_WRITE,
1510 FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1511 FILE_ATTRIBUTE_NORMAL, NULL);
1512 if (cons == INVALID_HANDLE_VALUE) {
1513 /* There is no console associated with this process.
1514 * Since the child is a console process, Windows
1515 * would normally create a console window. But
1516 * since we'll be redirecting std streams, we do
1517 * not need the console.
1518 * It is necessary to use DETACHED_PROCESS
1519 * instead of CREATE_NO_WINDOW to make ssh
1520 * recognize that it has no console.
1521 */
1522 flags |= DETACHED_PROCESS;
1523 } else {
1524 /* There is already a console. If we specified
1525 * DETACHED_PROCESS here, too, Windows would
1526 * disassociate the child from the console.
1527 * The same is true for CREATE_NO_WINDOW.
1528 * Go figure!
1529 */
1530 CloseHandle(cons);
1531 }
1532 memset(&si, 0, sizeof(si));
1533 si.StartupInfo.cb = sizeof(si);
1534 si.StartupInfo.hStdInput = winansi_get_osfhandle(fhin);
1535 si.StartupInfo.hStdOutput = winansi_get_osfhandle(fhout);
1536 si.StartupInfo.hStdError = winansi_get_osfhandle(fherr);
1537
1538 /* The list of handles cannot contain duplicates */
1539 if (si.StartupInfo.hStdInput != INVALID_HANDLE_VALUE)
1540 stdhandles[stdhandles_count++] = si.StartupInfo.hStdInput;
1541 if (si.StartupInfo.hStdOutput != INVALID_HANDLE_VALUE &&
1542 si.StartupInfo.hStdOutput != si.StartupInfo.hStdInput)
1543 stdhandles[stdhandles_count++] = si.StartupInfo.hStdOutput;
1544 if (si.StartupInfo.hStdError != INVALID_HANDLE_VALUE &&
1545 si.StartupInfo.hStdError != si.StartupInfo.hStdInput &&
1546 si.StartupInfo.hStdError != si.StartupInfo.hStdOutput)
1547 stdhandles[stdhandles_count++] = si.StartupInfo.hStdError;
1548 if (stdhandles_count)
1549 si.StartupInfo.dwFlags |= STARTF_USESTDHANDLES;
1550
1551 if (*argv && !strcmp(cmd, *argv))
1552 wcmd[0] = L'\0';
1553 else if (xutftowcs_path(wcmd, cmd) < 0)
1554 return -1;
1555 if (dir && xutftowcs_path(wdir, dir) < 0)
1556 return -1;
1557
1558 /* concatenate argv, quoting args as we go */
1559 strbuf_init(&args, 0);
1560 if (prepend_cmd) {
1561 char *quoted = (char *)quote_arg(cmd);
1562 strbuf_addstr(&args, quoted);
1563 if (quoted != cmd)
1564 free(quoted);
1565 }
1566 for (; *argv; argv++) {
1567 char *quoted = (char *)quote_arg(*argv);
1568 if (*args.buf)
1569 strbuf_addch(&args, ' ');
1570 strbuf_addstr(&args, quoted);
1571 if (quoted != *argv)
1572 free(quoted);
1573 }
1574
1575 strace_env = getenv("GIT_STRACE_COMMANDS");
1576 if (strace_env) {
1577 char *p = path_lookup("strace.exe", 1);
1578 if (!p)
1579 return error("strace not found!");
1580 if (xutftowcs_path(wcmd, p) < 0) {
1581 free(p);
1582 return -1;
1583 }
1584 free(p);
1585 if (!strcmp("1", strace_env) ||
1586 !strcasecmp("yes", strace_env) ||
1587 !strcasecmp("true", strace_env))
1588 strbuf_insert(&args, 0, "strace ", 7);
1589 else {
1590 const char *quoted = quote_arg(strace_env);
1591 struct strbuf buf = STRBUF_INIT;
1592 strbuf_addf(&buf, "strace -o %s ", quoted);
1593 if (quoted != strace_env)
1594 free((char *)quoted);
1595 strbuf_insert(&args, 0, buf.buf, buf.len);
1596 strbuf_release(&buf);
1597 }
1598 }
1599
1600 ALLOC_ARRAY(wargs, st_add(st_mult(2, args.len), 1));
1601 xutftowcs(wargs, args.buf, 2 * args.len + 1);
1602 strbuf_release(&args);
1603
1604 wenvblk = make_environment_block(deltaenv);
1605
1606 memset(&pi, 0, sizeof(pi));
1607 if (restrict_handle_inheritance && stdhandles_count &&
1608 (InitializeProcThreadAttributeList(NULL, 1, 0, &size) ||
1609 GetLastError() == ERROR_INSUFFICIENT_BUFFER) &&
1610 (attr_list = (LPPROC_THREAD_ATTRIBUTE_LIST)
1611 (HeapAlloc(GetProcessHeap(), 0, size))) &&
1612 InitializeProcThreadAttributeList(attr_list, 1, 0, &size) &&
1613 UpdateProcThreadAttribute(attr_list, 0,
1614 PROC_THREAD_ATTRIBUTE_HANDLE_LIST,
1615 stdhandles,
1616 stdhandles_count * sizeof(HANDLE),
1617 NULL, NULL)) {
1618 si.lpAttributeList = attr_list;
1619 flags |= EXTENDED_STARTUPINFO_PRESENT;
1620 }
1621
1622 ret = CreateProcessW(*wcmd ? wcmd : NULL, wargs, NULL, NULL,
1623 stdhandles_count ? TRUE : FALSE,
1624 flags, wenvblk, dir ? wdir : NULL,
1625 &si.StartupInfo, &pi);
1626
1627 /*
1628 * On Windows 2008 R2, it seems that specifying certain types of handles
1629 * (such as FILE_TYPE_CHAR or FILE_TYPE_PIPE) will always produce an
1630 * error. Rather than playing finicky and fragile games, let's just try
1631 * to detect this situation and simply try again without restricting any
1632 * handle inheritance. This is still better than failing to create
1633 * processes.
1634 */
1635 if (!ret && restrict_handle_inheritance && stdhandles_count) {
1636 DWORD err = GetLastError();
1637 struct strbuf buf = STRBUF_INIT;
1638
1639 if (err != ERROR_NO_SYSTEM_RESOURCES &&
1640 /*
1641 * On Windows 7 and earlier, handles on pipes and character
1642 * devices are inherited automatically, and cannot be
1643 * specified in the thread handle list. Rather than trying
1644 * to catch each and every corner case (and running the
1645 * chance of *still* forgetting a few), let's just fall
1646 * back to creating the process without trying to limit the
1647 * handle inheritance.
1648 */
1649 !(err == ERROR_INVALID_PARAMETER &&
1650 GetVersion() >> 16 < 9200) &&
1651 !getenv("SUPPRESS_HANDLE_INHERITANCE_WARNING")) {
1652 DWORD fl = 0;
1653 int i;
1654
1655 setenv("SUPPRESS_HANDLE_INHERITANCE_WARNING", "1", 1);
1656
1657 for (i = 0; i < stdhandles_count; i++) {
1658 HANDLE h = stdhandles[i];
1659 strbuf_addf(&buf, "handle #%d: %p (type %lx, "
1660 "handle info (%d) %lx\n", i, h,
1661 GetFileType(h),
1662 GetHandleInformation(h, &fl),
1663 fl);
1664 }
1665 strbuf_addstr(&buf, "\nThis is a bug; please report it "
1666 "at\nhttps://github.com/git-for-windows/"
1667 "git/issues/new\n\n"
1668 "To suppress this warning, please set "
1669 "the environment variable\n\n"
1670 "\tSUPPRESS_HANDLE_INHERITANCE_WARNING=1"
1671 "\n");
1672 }
1673 restrict_handle_inheritance = 0;
1674 flags &= ~EXTENDED_STARTUPINFO_PRESENT;
1675 ret = CreateProcessW(*wcmd ? wcmd : NULL, wargs, NULL, NULL,
1676 TRUE, flags, wenvblk, dir ? wdir : NULL,
1677 &si.StartupInfo, &pi);
1678 if (!ret)
1679 errno = err_win_to_posix(GetLastError());
1680 if (ret && buf.len) {
1681 warning("failed to restrict file handles (%ld)\n\n%s",
1682 err, buf.buf);
1683 }
1684 strbuf_release(&buf);
1685 } else if (!ret)
1686 errno = err_win_to_posix(GetLastError());
1687
1688 if (si.lpAttributeList)
1689 DeleteProcThreadAttributeList(si.lpAttributeList);
1690 if (attr_list)
1691 HeapFree(GetProcessHeap(), 0, attr_list);
1692
1693 free(wenvblk);
1694 free(wargs);
1695
1696 if (!ret)
1697 return -1;
1698
1699 CloseHandle(pi.hThread);
1700
1701 /*
1702 * The process ID is the human-readable identifier of the process
1703 * that we want to present in log and error messages. The handle
1704 * is not useful for this purpose. But we cannot close it, either,
1705 * because it is not possible to turn a process ID into a process
1706 * handle after the process terminated.
1707 * Keep the handle in a list for waitpid.
1708 */
1709 EnterCriticalSection(&pinfo_cs);
1710 {
1711 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1712 info->pid = pi.dwProcessId;
1713 info->proc = pi.hProcess;
1714 info->next = pinfo;
1715 pinfo = info;
1716 }
1717 LeaveCriticalSection(&pinfo_cs);
1718
1719 return (pid_t)pi.dwProcessId;
1720 }
1721
1722 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1723 {
1724 return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1725 }
1726
1727 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1728 const char *dir,
1729 int fhin, int fhout, int fherr)
1730 {
1731 pid_t pid;
1732 char *prog = path_lookup(cmd, 0);
1733
1734 if (!prog) {
1735 errno = ENOENT;
1736 pid = -1;
1737 }
1738 else {
1739 const char *interpr = parse_interpreter(prog);
1740
1741 if (interpr) {
1742 const char *argv0 = argv[0];
1743 char *iprog = path_lookup(interpr, 1);
1744 argv[0] = prog;
1745 if (!iprog) {
1746 errno = ENOENT;
1747 pid = -1;
1748 }
1749 else {
1750 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1751 fhin, fhout, fherr);
1752 free(iprog);
1753 }
1754 argv[0] = argv0;
1755 }
1756 else
1757 pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1758 fhin, fhout, fherr);
1759 free(prog);
1760 }
1761 return pid;
1762 }
1763
1764 static int try_shell_exec(const char *cmd, char *const *argv)
1765 {
1766 const char *interpr = parse_interpreter(cmd);
1767 char *prog;
1768 int pid = 0;
1769
1770 if (!interpr)
1771 return 0;
1772 prog = path_lookup(interpr, 1);
1773 if (prog) {
1774 int exec_id;
1775 int argc = 0;
1776 #ifndef _MSC_VER
1777 const
1778 #endif
1779 char **argv2;
1780 while (argv[argc]) argc++;
1781 ALLOC_ARRAY(argv2, argc + 1);
1782 argv2[0] = (char *)cmd; /* full path to the script file */
1783 COPY_ARRAY(&argv2[1], &argv[1], argc);
1784 exec_id = trace2_exec(prog, argv2);
1785 pid = mingw_spawnv(prog, argv2, 1);
1786 if (pid >= 0) {
1787 int status;
1788 if (waitpid(pid, &status, 0) < 0)
1789 status = 255;
1790 trace2_exec_result(exec_id, status);
1791 exit(status);
1792 }
1793 trace2_exec_result(exec_id, -1);
1794 pid = 1; /* indicate that we tried but failed */
1795 free(prog);
1796 free(argv2);
1797 }
1798 return pid;
1799 }
1800
1801 int mingw_execv(const char *cmd, char *const *argv)
1802 {
1803 /* check if git_command is a shell script */
1804 if (!try_shell_exec(cmd, argv)) {
1805 int pid, status;
1806 int exec_id;
1807
1808 exec_id = trace2_exec(cmd, (const char **)argv);
1809 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1810 if (pid < 0) {
1811 trace2_exec_result(exec_id, -1);
1812 return -1;
1813 }
1814 if (waitpid(pid, &status, 0) < 0)
1815 status = 255;
1816 trace2_exec_result(exec_id, status);
1817 exit(status);
1818 }
1819 return -1;
1820 }
1821
1822 int mingw_execvp(const char *cmd, char *const *argv)
1823 {
1824 char *prog = path_lookup(cmd, 0);
1825
1826 if (prog) {
1827 mingw_execv(prog, argv);
1828 free(prog);
1829 } else
1830 errno = ENOENT;
1831
1832 return -1;
1833 }
1834
1835 int mingw_kill(pid_t pid, int sig)
1836 {
1837 if (pid > 0 && sig == SIGTERM) {
1838 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1839
1840 if (TerminateProcess(h, -1)) {
1841 CloseHandle(h);
1842 return 0;
1843 }
1844
1845 errno = err_win_to_posix(GetLastError());
1846 CloseHandle(h);
1847 return -1;
1848 } else if (pid > 0 && sig == 0) {
1849 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1850 if (h) {
1851 CloseHandle(h);
1852 return 0;
1853 }
1854 }
1855
1856 errno = EINVAL;
1857 return -1;
1858 }
1859
1860 /*
1861 * UTF-8 versions of getenv(), putenv() and unsetenv().
1862 * Internally, they use the CRT's stock UNICODE routines
1863 * to avoid data loss.
1864 */
1865 char *mingw_getenv(const char *name)
1866 {
1867 #define GETENV_MAX_RETAIN 64
1868 static char *values[GETENV_MAX_RETAIN];
1869 static int value_counter;
1870 int len_key, len_value;
1871 wchar_t *w_key;
1872 char *value;
1873 wchar_t w_value[32768];
1874
1875 if (!name || !*name)
1876 return NULL;
1877
1878 len_key = strlen(name) + 1;
1879 /* We cannot use xcalloc() here because that uses getenv() itself */
1880 w_key = calloc(len_key, sizeof(wchar_t));
1881 if (!w_key)
1882 die("Out of memory, (tried to allocate %u wchar_t's)", len_key);
1883 xutftowcs(w_key, name, len_key);
1884 /* GetEnvironmentVariableW() only sets the last error upon failure */
1885 SetLastError(ERROR_SUCCESS);
1886 len_value = GetEnvironmentVariableW(w_key, w_value, ARRAY_SIZE(w_value));
1887 if (!len_value && GetLastError() == ERROR_ENVVAR_NOT_FOUND) {
1888 free(w_key);
1889 return NULL;
1890 }
1891 free(w_key);
1892
1893 len_value = len_value * 3 + 1;
1894 /* We cannot use xcalloc() here because that uses getenv() itself */
1895 value = calloc(len_value, sizeof(char));
1896 if (!value)
1897 die("Out of memory, (tried to allocate %u bytes)", len_value);
1898 xwcstoutf(value, w_value, len_value);
1899
1900 /*
1901 * We return `value` which is an allocated value and the caller is NOT
1902 * expecting to have to free it, so we keep a round-robin array,
1903 * invalidating the buffer after GETENV_MAX_RETAIN getenv() calls.
1904 */
1905 free(values[value_counter]);
1906 values[value_counter++] = value;
1907 if (value_counter >= ARRAY_SIZE(values))
1908 value_counter = 0;
1909
1910 return value;
1911 }
1912
1913 int mingw_putenv(const char *namevalue)
1914 {
1915 int size;
1916 wchar_t *wide, *equal;
1917 BOOL result;
1918
1919 if (!namevalue || !*namevalue)
1920 return 0;
1921
1922 size = strlen(namevalue) * 2 + 1;
1923 wide = calloc(size, sizeof(wchar_t));
1924 if (!wide)
1925 die("Out of memory, (tried to allocate %u wchar_t's)", size);
1926 xutftowcs(wide, namevalue, size);
1927 equal = wcschr(wide, L'=');
1928 if (!equal)
1929 result = SetEnvironmentVariableW(wide, NULL);
1930 else {
1931 *equal = L'\0';
1932 result = SetEnvironmentVariableW(wide, equal + 1);
1933 }
1934 free(wide);
1935
1936 if (!result)
1937 errno = err_win_to_posix(GetLastError());
1938
1939 return result ? 0 : -1;
1940 }
1941
1942 static void ensure_socket_initialization(void)
1943 {
1944 WSADATA wsa;
1945 static int initialized = 0;
1946
1947 if (initialized)
1948 return;
1949
1950 if (WSAStartup(MAKEWORD(2,2), &wsa))
1951 die("unable to initialize winsock subsystem, error %d",
1952 WSAGetLastError());
1953
1954 atexit((void(*)(void)) WSACleanup);
1955 initialized = 1;
1956 }
1957
1958 #undef gethostname
1959 int mingw_gethostname(char *name, int namelen)
1960 {
1961 ensure_socket_initialization();
1962 return gethostname(name, namelen);
1963 }
1964
1965 #undef gethostbyname
1966 struct hostent *mingw_gethostbyname(const char *host)
1967 {
1968 ensure_socket_initialization();
1969 return gethostbyname(host);
1970 }
1971
1972 #undef getaddrinfo
1973 int mingw_getaddrinfo(const char *node, const char *service,
1974 const struct addrinfo *hints, struct addrinfo **res)
1975 {
1976 ensure_socket_initialization();
1977 return getaddrinfo(node, service, hints, res);
1978 }
1979
1980 int mingw_socket(int domain, int type, int protocol)
1981 {
1982 int sockfd;
1983 SOCKET s;
1984
1985 ensure_socket_initialization();
1986 s = WSASocket(domain, type, protocol, NULL, 0, 0);
1987 if (s == INVALID_SOCKET) {
1988 /*
1989 * WSAGetLastError() values are regular BSD error codes
1990 * biased by WSABASEERR.
1991 * However, strerror() does not know about networking
1992 * specific errors, which are values beginning at 38 or so.
1993 * Therefore, we choose to leave the biased error code
1994 * in errno so that _if_ someone looks up the code somewhere,
1995 * then it is at least the number that are usually listed.
1996 */
1997 errno = WSAGetLastError();
1998 return -1;
1999 }
2000 /* convert into a file descriptor */
2001 if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
2002 closesocket(s);
2003 return error("unable to make a socket file descriptor: %s",
2004 strerror(errno));
2005 }
2006 return sockfd;
2007 }
2008
2009 #undef connect
2010 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
2011 {
2012 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
2013 return connect(s, sa, sz);
2014 }
2015
2016 #undef bind
2017 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
2018 {
2019 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
2020 return bind(s, sa, sz);
2021 }
2022
2023 #undef setsockopt
2024 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
2025 {
2026 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
2027 return setsockopt(s, lvl, optname, (const char*)optval, optlen);
2028 }
2029
2030 #undef shutdown
2031 int mingw_shutdown(int sockfd, int how)
2032 {
2033 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
2034 return shutdown(s, how);
2035 }
2036
2037 #undef listen
2038 int mingw_listen(int sockfd, int backlog)
2039 {
2040 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
2041 return listen(s, backlog);
2042 }
2043
2044 #undef accept
2045 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
2046 {
2047 int sockfd2;
2048
2049 SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
2050 SOCKET s2 = accept(s1, sa, sz);
2051
2052 /* convert into a file descriptor */
2053 if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
2054 int err = errno;
2055 closesocket(s2);
2056 return error("unable to make a socket file descriptor: %s",
2057 strerror(err));
2058 }
2059 return sockfd2;
2060 }
2061
2062 #undef rename
2063 int mingw_rename(const char *pold, const char *pnew)
2064 {
2065 DWORD attrs, gle;
2066 int tries = 0;
2067 wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
2068 if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
2069 return -1;
2070
2071 /*
2072 * Try native rename() first to get errno right.
2073 * It is based on MoveFile(), which cannot overwrite existing files.
2074 */
2075 if (!_wrename(wpold, wpnew))
2076 return 0;
2077 if (errno != EEXIST)
2078 return -1;
2079 repeat:
2080 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
2081 return 0;
2082 /* TODO: translate more errors */
2083 gle = GetLastError();
2084 if (gle == ERROR_ACCESS_DENIED &&
2085 (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
2086 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
2087 DWORD attrsold = GetFileAttributesW(wpold);
2088 if (attrsold == INVALID_FILE_ATTRIBUTES ||
2089 !(attrsold & FILE_ATTRIBUTE_DIRECTORY))
2090 errno = EISDIR;
2091 else if (!_wrmdir(wpnew))
2092 goto repeat;
2093 return -1;
2094 }
2095 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
2096 SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
2097 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
2098 return 0;
2099 gle = GetLastError();
2100 /* revert file attributes on failure */
2101 SetFileAttributesW(wpnew, attrs);
2102 }
2103 }
2104 if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
2105 /*
2106 * We assume that some other process had the source or
2107 * destination file open at the wrong moment and retry.
2108 * In order to give the other process a higher chance to
2109 * complete its operation, we give up our time slice now.
2110 * If we have to retry again, we do sleep a bit.
2111 */
2112 Sleep(delay[tries]);
2113 tries++;
2114 goto repeat;
2115 }
2116 if (gle == ERROR_ACCESS_DENIED &&
2117 ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
2118 "Should I try again?", pold, pnew))
2119 goto repeat;
2120
2121 errno = EACCES;
2122 return -1;
2123 }
2124
2125 /*
2126 * Note that this doesn't return the actual pagesize, but
2127 * the allocation granularity. If future Windows specific git code
2128 * needs the real getpagesize function, we need to find another solution.
2129 */
2130 int mingw_getpagesize(void)
2131 {
2132 SYSTEM_INFO si;
2133 GetSystemInfo(&si);
2134 return si.dwAllocationGranularity;
2135 }
2136
2137 /* See https://msdn.microsoft.com/en-us/library/windows/desktop/ms724435.aspx */
2138 enum EXTENDED_NAME_FORMAT {
2139 NameDisplay = 3,
2140 NameUserPrincipal = 8
2141 };
2142
2143 static char *get_extended_user_info(enum EXTENDED_NAME_FORMAT type)
2144 {
2145 DECLARE_PROC_ADDR(secur32.dll, BOOL, GetUserNameExW,
2146 enum EXTENDED_NAME_FORMAT, LPCWSTR, PULONG);
2147 static wchar_t wbuffer[1024];
2148 DWORD len;
2149
2150 if (!INIT_PROC_ADDR(GetUserNameExW))
2151 return NULL;
2152
2153 len = ARRAY_SIZE(wbuffer);
2154 if (GetUserNameExW(type, wbuffer, &len)) {
2155 char *converted = xmalloc((len *= 3));
2156 if (xwcstoutf(converted, wbuffer, len) >= 0)
2157 return converted;
2158 free(converted);
2159 }
2160
2161 return NULL;
2162 }
2163
2164 char *mingw_query_user_email(void)
2165 {
2166 return get_extended_user_info(NameUserPrincipal);
2167 }
2168
2169 struct passwd *getpwuid(int uid)
2170 {
2171 static unsigned initialized;
2172 static char user_name[100];
2173 static struct passwd *p;
2174 wchar_t buf[100];
2175 DWORD len;
2176
2177 if (initialized)
2178 return p;
2179
2180 len = ARRAY_SIZE(buf);
2181 if (!GetUserNameW(buf, &len)) {
2182 initialized = 1;
2183 return NULL;
2184 }
2185
2186 if (xwcstoutf(user_name, buf, sizeof(user_name)) < 0) {
2187 initialized = 1;
2188 return NULL;
2189 }
2190
2191 p = xmalloc(sizeof(*p));
2192 p->pw_name = user_name;
2193 p->pw_gecos = get_extended_user_info(NameDisplay);
2194 if (!p->pw_gecos)
2195 p->pw_gecos = "unknown";
2196 p->pw_dir = NULL;
2197
2198 initialized = 1;
2199 return p;
2200 }
2201
2202 static HANDLE timer_event;
2203 static HANDLE timer_thread;
2204 static int timer_interval;
2205 static int one_shot;
2206 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
2207
2208 /* The timer works like this:
2209 * The thread, ticktack(), is a trivial routine that most of the time
2210 * only waits to receive the signal to terminate. The main thread tells
2211 * the thread to terminate by setting the timer_event to the signalled
2212 * state.
2213 * But ticktack() interrupts the wait state after the timer's interval
2214 * length to call the signal handler.
2215 */
2216
2217 static unsigned __stdcall ticktack(void *dummy)
2218 {
2219 while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
2220 mingw_raise(SIGALRM);
2221 if (one_shot)
2222 break;
2223 }
2224 return 0;
2225 }
2226
2227 static int start_timer_thread(void)
2228 {
2229 timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
2230 if (timer_event) {
2231 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
2232 if (!timer_thread )
2233 return errno = ENOMEM,
2234 error("cannot start timer thread");
2235 } else
2236 return errno = ENOMEM,
2237 error("cannot allocate resources for timer");
2238 return 0;
2239 }
2240
2241 static void stop_timer_thread(void)
2242 {
2243 if (timer_event)
2244 SetEvent(timer_event); /* tell thread to terminate */
2245 if (timer_thread) {
2246 int rc = WaitForSingleObject(timer_thread, 10000);
2247 if (rc == WAIT_TIMEOUT)
2248 error("timer thread did not terminate timely");
2249 else if (rc != WAIT_OBJECT_0)
2250 error("waiting for timer thread failed: %lu",
2251 GetLastError());
2252 CloseHandle(timer_thread);
2253 }
2254 if (timer_event)
2255 CloseHandle(timer_event);
2256 timer_event = NULL;
2257 timer_thread = NULL;
2258 }
2259
2260 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
2261 {
2262 return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
2263 }
2264
2265 int setitimer(int type, struct itimerval *in, struct itimerval *out)
2266 {
2267 static const struct timeval zero;
2268 static int atexit_done;
2269
2270 if (out != NULL)
2271 return errno = EINVAL,
2272 error("setitimer param 3 != NULL not implemented");
2273 if (!is_timeval_eq(&in->it_interval, &zero) &&
2274 !is_timeval_eq(&in->it_interval, &in->it_value))
2275 return errno = EINVAL,
2276 error("setitimer: it_interval must be zero or eq it_value");
2277
2278 if (timer_thread)
2279 stop_timer_thread();
2280
2281 if (is_timeval_eq(&in->it_value, &zero) &&
2282 is_timeval_eq(&in->it_interval, &zero))
2283 return 0;
2284
2285 timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
2286 one_shot = is_timeval_eq(&in->it_interval, &zero);
2287 if (!atexit_done) {
2288 atexit(stop_timer_thread);
2289 atexit_done = 1;
2290 }
2291 return start_timer_thread();
2292 }
2293
2294 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
2295 {
2296 if (sig != SIGALRM)
2297 return errno = EINVAL,
2298 error("sigaction only implemented for SIGALRM");
2299 if (out != NULL)
2300 return errno = EINVAL,
2301 error("sigaction: param 3 != NULL not implemented");
2302
2303 timer_fn = in->sa_handler;
2304 return 0;
2305 }
2306
2307 #undef signal
2308 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
2309 {
2310 sig_handler_t old;
2311
2312 switch (sig) {
2313 case SIGALRM:
2314 old = timer_fn;
2315 timer_fn = handler;
2316 break;
2317
2318 case SIGINT:
2319 old = sigint_fn;
2320 sigint_fn = handler;
2321 break;
2322
2323 default:
2324 return signal(sig, handler);
2325 }
2326
2327 return old;
2328 }
2329
2330 #undef raise
2331 int mingw_raise(int sig)
2332 {
2333 switch (sig) {
2334 case SIGALRM:
2335 if (timer_fn == SIG_DFL) {
2336 if (isatty(STDERR_FILENO))
2337 fputs("Alarm clock\n", stderr);
2338 exit(128 + SIGALRM);
2339 } else if (timer_fn != SIG_IGN)
2340 timer_fn(SIGALRM);
2341 return 0;
2342
2343 case SIGINT:
2344 if (sigint_fn == SIG_DFL)
2345 exit(128 + SIGINT);
2346 else if (sigint_fn != SIG_IGN)
2347 sigint_fn(SIGINT);
2348 return 0;
2349
2350 #if defined(_MSC_VER)
2351 case SIGILL:
2352 case SIGFPE:
2353 case SIGSEGV:
2354 case SIGTERM:
2355 case SIGBREAK:
2356 case SIGABRT:
2357 case SIGABRT_COMPAT:
2358 /*
2359 * The <signal.h> header in the MS C Runtime defines 8 signals
2360 * as being supported on the platform. Anything else causes an
2361 * "Invalid signal or error" (which in DEBUG builds causes the
2362 * Abort/Retry/Ignore dialog). We by-pass the CRT for things we
2363 * already know will fail.
2364 */
2365 return raise(sig);
2366 default:
2367 errno = EINVAL;
2368 return -1;
2369
2370 #else
2371
2372 default:
2373 return raise(sig);
2374
2375 #endif
2376
2377 }
2378 }
2379
2380 int link(const char *oldpath, const char *newpath)
2381 {
2382 wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
2383 if (xutftowcs_path(woldpath, oldpath) < 0 ||
2384 xutftowcs_path(wnewpath, newpath) < 0)
2385 return -1;
2386
2387 if (!CreateHardLinkW(wnewpath, woldpath, NULL)) {
2388 errno = err_win_to_posix(GetLastError());
2389 return -1;
2390 }
2391 return 0;
2392 }
2393
2394 pid_t waitpid(pid_t pid, int *status, int options)
2395 {
2396 HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
2397 FALSE, pid);
2398 if (!h) {
2399 errno = ECHILD;
2400 return -1;
2401 }
2402
2403 if (pid > 0 && options & WNOHANG) {
2404 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
2405 CloseHandle(h);
2406 return 0;
2407 }
2408 options &= ~WNOHANG;
2409 }
2410
2411 if (options == 0) {
2412 struct pinfo_t **ppinfo;
2413 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
2414 CloseHandle(h);
2415 return 0;
2416 }
2417
2418 if (status)
2419 GetExitCodeProcess(h, (LPDWORD)status);
2420
2421 EnterCriticalSection(&pinfo_cs);
2422
2423 ppinfo = &pinfo;
2424 while (*ppinfo) {
2425 struct pinfo_t *info = *ppinfo;
2426 if (info->pid == pid) {
2427 CloseHandle(info->proc);
2428 *ppinfo = info->next;
2429 free(info);
2430 break;
2431 }
2432 ppinfo = &info->next;
2433 }
2434
2435 LeaveCriticalSection(&pinfo_cs);
2436
2437 CloseHandle(h);
2438 return pid;
2439 }
2440 CloseHandle(h);
2441
2442 errno = EINVAL;
2443 return -1;
2444 }
2445
2446 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
2447 {
2448 int upos = 0, wpos = 0;
2449 const unsigned char *utf = (const unsigned char*) utfs;
2450 if (!utf || !wcs || wcslen < 1) {
2451 errno = EINVAL;
2452 return -1;
2453 }
2454 /* reserve space for \0 */
2455 wcslen--;
2456 if (utflen < 0)
2457 utflen = INT_MAX;
2458
2459 while (upos < utflen) {
2460 int c = utf[upos++] & 0xff;
2461 if (utflen == INT_MAX && c == 0)
2462 break;
2463
2464 if (wpos >= wcslen) {
2465 wcs[wpos] = 0;
2466 errno = ERANGE;
2467 return -1;
2468 }
2469
2470 if (c < 0x80) {
2471 /* ASCII */
2472 wcs[wpos++] = c;
2473 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2474 (utf[upos] & 0xc0) == 0x80) {
2475 /* 2-byte utf-8 */
2476 c = ((c & 0x1f) << 6);
2477 c |= (utf[upos++] & 0x3f);
2478 wcs[wpos++] = c;
2479 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2480 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2481 (utf[upos] & 0xc0) == 0x80 &&
2482 (utf[upos + 1] & 0xc0) == 0x80) {
2483 /* 3-byte utf-8 */
2484 c = ((c & 0x0f) << 12);
2485 c |= ((utf[upos++] & 0x3f) << 6);
2486 c |= (utf[upos++] & 0x3f);
2487 wcs[wpos++] = c;
2488 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2489 wpos + 1 < wcslen &&
2490 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2491 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2492 (utf[upos] & 0xc0) == 0x80 &&
2493 (utf[upos + 1] & 0xc0) == 0x80 &&
2494 (utf[upos + 2] & 0xc0) == 0x80) {
2495 /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2496 c = ((c & 0x07) << 18);
2497 c |= ((utf[upos++] & 0x3f) << 12);
2498 c |= ((utf[upos++] & 0x3f) << 6);
2499 c |= (utf[upos++] & 0x3f);
2500 c -= 0x10000;
2501 wcs[wpos++] = 0xd800 | (c >> 10);
2502 wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2503 } else if (c >= 0xa0) {
2504 /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2505 wcs[wpos++] = c;
2506 } else {
2507 /* invalid utf-8 byte, non-printable unicode: convert to hex */
2508 static const char *hex = "0123456789abcdef";
2509 wcs[wpos++] = hex[c >> 4];
2510 if (wpos < wcslen)
2511 wcs[wpos++] = hex[c & 0x0f];
2512 }
2513 }
2514 wcs[wpos] = 0;
2515 return wpos;
2516 }
2517
2518 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2519 {
2520 if (!wcs || !utf || utflen < 1) {
2521 errno = EINVAL;
2522 return -1;
2523 }
2524 utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2525 if (utflen)
2526 return utflen - 1;
2527 errno = ERANGE;
2528 return -1;
2529 }
2530
2531 static void setup_windows_environment(void)
2532 {
2533 char *tmp = getenv("TMPDIR");
2534
2535 /* on Windows it is TMP and TEMP */
2536 if (!tmp) {
2537 if (!(tmp = getenv("TMP")))
2538 tmp = getenv("TEMP");
2539 if (tmp) {
2540 setenv("TMPDIR", tmp, 1);
2541 tmp = getenv("TMPDIR");
2542 }
2543 }
2544
2545 if (tmp) {
2546 /*
2547 * Convert all dir separators to forward slashes,
2548 * to help shell commands called from the Git
2549 * executable (by not mistaking the dir separators
2550 * for escape characters).
2551 */
2552 convert_slashes(tmp);
2553 }
2554
2555 /* simulate TERM to enable auto-color (see color.c) */
2556 if (!getenv("TERM"))
2557 setenv("TERM", "cygwin", 1);
2558
2559 /* calculate HOME if not set */
2560 if (!getenv("HOME")) {
2561 /*
2562 * try $HOMEDRIVE$HOMEPATH - the home share may be a network
2563 * location, thus also check if the path exists (i.e. is not
2564 * disconnected)
2565 */
2566 if ((tmp = getenv("HOMEDRIVE"))) {
2567 struct strbuf buf = STRBUF_INIT;
2568 strbuf_addstr(&buf, tmp);
2569 if ((tmp = getenv("HOMEPATH"))) {
2570 strbuf_addstr(&buf, tmp);
2571 if (is_directory(buf.buf))
2572 setenv("HOME", buf.buf, 1);
2573 else
2574 tmp = NULL; /* use $USERPROFILE */
2575 }
2576 strbuf_release(&buf);
2577 }
2578 /* use $USERPROFILE if the home share is not available */
2579 if (!tmp && (tmp = getenv("USERPROFILE")))
2580 setenv("HOME", tmp, 1);
2581 }
2582 }
2583
2584 int is_valid_win32_path(const char *path, int allow_literal_nul)
2585 {
2586 const char *p = path;
2587 int preceding_space_or_period = 0, i = 0, periods = 0;
2588
2589 if (!protect_ntfs)
2590 return 1;
2591
2592 skip_dos_drive_prefix((char **)&path);
2593 goto segment_start;
2594
2595 for (;;) {
2596 char c = *(path++);
2597 switch (c) {
2598 case '\0':
2599 case '/': case '\\':
2600 /* cannot end in ` ` or `.`, except for `.` and `..` */
2601 if (preceding_space_or_period &&
2602 (i != periods || periods > 2))
2603 return 0;
2604 if (!c)
2605 return 1;
2606
2607 i = periods = preceding_space_or_period = 0;
2608
2609 segment_start:
2610 switch (*path) {
2611 case 'a': case 'A': /* AUX */
2612 if (((c = path[++i]) != 'u' && c != 'U') ||
2613 ((c = path[++i]) != 'x' && c != 'X')) {
2614 not_a_reserved_name:
2615 path += i;
2616 continue;
2617 }
2618 break;
2619 case 'c': case 'C':
2620 /* COM1 ... COM9, CON, CONIN$, CONOUT$ */
2621 if ((c = path[++i]) != 'o' && c != 'O')
2622 goto not_a_reserved_name;
2623 c = path[++i];
2624 if (c == 'm' || c == 'M') { /* COM1 ... COM9 */
2625 c = path[++i];
2626 if (c < '1' || c > '9')
2627 goto not_a_reserved_name;
2628 } else if (c == 'n' || c == 'N') { /* CON */
2629 c = path[i + 1];
2630 if ((c == 'i' || c == 'I') &&
2631 ((c = path[i + 2]) == 'n' ||
2632 c == 'N') &&
2633 path[i + 3] == '$')
2634 i += 3; /* CONIN$ */
2635 else if ((c == 'o' || c == 'O') &&
2636 ((c = path[i + 2]) == 'u' ||
2637 c == 'U') &&
2638 ((c = path[i + 3]) == 't' ||
2639 c == 'T') &&
2640 path[i + 4] == '$')
2641 i += 4; /* CONOUT$ */
2642 } else
2643 goto not_a_reserved_name;
2644 break;
2645 case 'l': case 'L': /* LPT<N> */
2646 if (((c = path[++i]) != 'p' && c != 'P') ||
2647 ((c = path[++i]) != 't' && c != 'T') ||
2648 !isdigit(path[++i]))
2649 goto not_a_reserved_name;
2650 break;
2651 case 'n': case 'N': /* NUL */
2652 if (((c = path[++i]) != 'u' && c != 'U') ||
2653 ((c = path[++i]) != 'l' && c != 'L') ||
2654 (allow_literal_nul &&
2655 !path[i + 1] && p == path))
2656 goto not_a_reserved_name;
2657 break;
2658 case 'p': case 'P': /* PRN */
2659 if (((c = path[++i]) != 'r' && c != 'R') ||
2660 ((c = path[++i]) != 'n' && c != 'N'))
2661 goto not_a_reserved_name;
2662 break;
2663 default:
2664 continue;
2665 }
2666
2667 /*
2668 * So far, this looks like a reserved name. Let's see
2669 * whether it actually is one: trailing spaces, a file
2670 * extension, or an NTFS Alternate Data Stream do not
2671 * matter, the name is still reserved if any of those
2672 * follow immediately after the actual name.
2673 */
2674 i++;
2675 if (path[i] == ' ') {
2676 preceding_space_or_period = 1;
2677 while (path[++i] == ' ')
2678 ; /* skip all spaces */
2679 }
2680
2681 c = path[i];
2682 if (c && c != '.' && c != ':' && c != '/' && c != '\\')
2683 goto not_a_reserved_name;
2684
2685 /* contains reserved name */
2686 return 0;
2687 case '.':
2688 periods++;
2689 /* fallthru */
2690 case ' ':
2691 preceding_space_or_period = 1;
2692 i++;
2693 continue;
2694 case ':': /* DOS drive prefix was already skipped */
2695 case '<': case '>': case '"': case '|': case '?': case '*':
2696 /* illegal character */
2697 return 0;
2698 default:
2699 if (c > '\0' && c < '\x20')
2700 /* illegal character */
2701 return 0;
2702 }
2703 preceding_space_or_period = 0;
2704 i++;
2705 }
2706 }
2707
2708 #if !defined(_MSC_VER)
2709 /*
2710 * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2711 * mingw startup code, see init.c in mingw runtime).
2712 */
2713 int _CRT_glob = 0;
2714 #endif
2715
2716 static NORETURN void die_startup(void)
2717 {
2718 fputs("fatal: not enough memory for initialization", stderr);
2719 exit(128);
2720 }
2721
2722 static void *malloc_startup(size_t size)
2723 {
2724 void *result = malloc(size);
2725 if (!result)
2726 die_startup();
2727 return result;
2728 }
2729
2730 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2731 {
2732 len = xwcstoutf(buffer, wcs, len) + 1;
2733 return memcpy(malloc_startup(len), buffer, len);
2734 }
2735
2736 static void maybe_redirect_std_handle(const wchar_t *key, DWORD std_id, int fd,
2737 DWORD desired_access, DWORD flags)
2738 {
2739 DWORD create_flag = fd ? OPEN_ALWAYS : OPEN_EXISTING;
2740 wchar_t buf[MAX_PATH];
2741 DWORD max = ARRAY_SIZE(buf);
2742 HANDLE handle;
2743 DWORD ret = GetEnvironmentVariableW(key, buf, max);
2744
2745 if (!ret || ret >= max)
2746 return;
2747
2748 /* make sure this does not leak into child processes */
2749 SetEnvironmentVariableW(key, NULL);
2750 if (!wcscmp(buf, L"off")) {
2751 close(fd);
2752 handle = GetStdHandle(std_id);
2753 if (handle != INVALID_HANDLE_VALUE)
2754 CloseHandle(handle);
2755 return;
2756 }
2757 if (std_id == STD_ERROR_HANDLE && !wcscmp(buf, L"2>&1")) {
2758 handle = GetStdHandle(STD_OUTPUT_HANDLE);
2759 if (handle == INVALID_HANDLE_VALUE) {
2760 close(fd);
2761 handle = GetStdHandle(std_id);
2762 if (handle != INVALID_HANDLE_VALUE)
2763 CloseHandle(handle);
2764 } else {
2765 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2766 SetStdHandle(std_id, handle);
2767 dup2(new_fd, fd);
2768 /* do *not* close the new_fd: that would close stdout */
2769 }
2770 return;
2771 }
2772 handle = CreateFileW(buf, desired_access, 0, NULL, create_flag,
2773 flags, NULL);
2774 if (handle != INVALID_HANDLE_VALUE) {
2775 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2776 SetStdHandle(std_id, handle);
2777 dup2(new_fd, fd);
2778 close(new_fd);
2779 }
2780 }
2781
2782 static void maybe_redirect_std_handles(void)
2783 {
2784 maybe_redirect_std_handle(L"GIT_REDIRECT_STDIN", STD_INPUT_HANDLE, 0,
2785 GENERIC_READ, FILE_ATTRIBUTE_NORMAL);
2786 maybe_redirect_std_handle(L"GIT_REDIRECT_STDOUT", STD_OUTPUT_HANDLE, 1,
2787 GENERIC_WRITE, FILE_ATTRIBUTE_NORMAL);
2788 maybe_redirect_std_handle(L"GIT_REDIRECT_STDERR", STD_ERROR_HANDLE, 2,
2789 GENERIC_WRITE, FILE_FLAG_NO_BUFFERING);
2790 }
2791
2792 #ifdef _MSC_VER
2793 #ifdef _DEBUG
2794 #include <crtdbg.h>
2795 #endif
2796 #endif
2797
2798 /*
2799 * We implement wmain() and compile with -municode, which would
2800 * normally ignore main(), but we call the latter from the former
2801 * so that we can handle non-ASCII command-line parameters
2802 * appropriately.
2803 *
2804 * To be more compatible with the core git code, we convert
2805 * argv into UTF8 and pass them directly to main().
2806 */
2807 int wmain(int argc, const wchar_t **wargv)
2808 {
2809 int i, maxlen, exit_status;
2810 char *buffer, **save;
2811 const char **argv;
2812
2813 trace2_initialize_clock();
2814
2815 #ifdef _MSC_VER
2816 #ifdef _DEBUG
2817 _CrtSetReportMode(_CRT_ASSERT, _CRTDBG_MODE_DEBUG);
2818 #endif
2819
2820 #ifdef USE_MSVC_CRTDBG
2821 _CrtSetDbgFlag(_CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF);
2822 #endif
2823 #endif
2824
2825 maybe_redirect_std_handles();
2826
2827 /* determine size of argv and environ conversion buffer */
2828 maxlen = wcslen(wargv[0]);
2829 for (i = 1; i < argc; i++)
2830 maxlen = max(maxlen, wcslen(wargv[i]));
2831
2832 /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2833 maxlen = 3 * maxlen + 1;
2834 buffer = malloc_startup(maxlen);
2835
2836 /*
2837 * Create a UTF-8 version of w_argv. Also create a "save" copy
2838 * to remember all the string pointers because parse_options()
2839 * will remove claimed items from the argv that we pass down.
2840 */
2841 ALLOC_ARRAY(argv, argc + 1);
2842 ALLOC_ARRAY(save, argc + 1);
2843 for (i = 0; i < argc; i++)
2844 argv[i] = save[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2845 argv[i] = save[i] = NULL;
2846 free(buffer);
2847
2848 /* fix Windows specific environment settings */
2849 setup_windows_environment();
2850
2851 unset_environment_variables = xstrdup("PERL5LIB");
2852
2853 /* initialize critical section for waitpid pinfo_t list */
2854 InitializeCriticalSection(&pinfo_cs);
2855
2856 /* set up default file mode and file modes for stdin/out/err */
2857 _fmode = _O_BINARY;
2858 _setmode(_fileno(stdin), _O_BINARY);
2859 _setmode(_fileno(stdout), _O_BINARY);
2860 _setmode(_fileno(stderr), _O_BINARY);
2861
2862 /* initialize Unicode console */
2863 winansi_init();
2864
2865 /* invoke the real main() using our utf8 version of argv. */
2866 exit_status = main(argc, argv);
2867
2868 for (i = 0; i < argc; i++)
2869 free(save[i]);
2870 free(save);
2871 free(argv);
2872
2873 return exit_status;
2874 }
2875
2876 int uname(struct utsname *buf)
2877 {
2878 unsigned v = (unsigned)GetVersion();
2879 memset(buf, 0, sizeof(*buf));
2880 xsnprintf(buf->sysname, sizeof(buf->sysname), "Windows");
2881 xsnprintf(buf->release, sizeof(buf->release),
2882 "%u.%u", v & 0xff, (v >> 8) & 0xff);
2883 /* assuming NT variants only.. */
2884 xsnprintf(buf->version, sizeof(buf->version),
2885 "%u", (v >> 16) & 0x7fff);
2886 return 0;
2887 }
git for Debian