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Merge branch 'ar/submodule-add-config'
[git/debian.git] / compat / mingw.c
blob9e0cd1e097f25f59ebc15fe583cdcd215c82bfcd
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 strvec_pushl(&cp.args, "mintty", "gdb", NULL);
22 strvec_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 if (DeleteFileW(wpathname))
294 return 0;
295
296 /* read-only files cannot be removed */
297 _wchmod(wpathname, 0666);
298 while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
299 if (!is_file_in_use_error(GetLastError()))
300 break;
301 /*
302 * We assume that some other process had the source or
303 * destination file open at the wrong moment and retry.
304 * In order to give the other process a higher chance to
305 * complete its operation, we give up our time slice now.
306 * If we have to retry again, we do sleep a bit.
307 */
308 Sleep(delay[tries]);
309 tries++;
310 }
311 while (ret == -1 && is_file_in_use_error(GetLastError()) &&
312 ask_yes_no_if_possible("Unlink of file '%s' failed. "
313 "Should I try again?", pathname))
314 ret = _wunlink(wpathname);
315 return ret;
316 }
317
318 static int is_dir_empty(const wchar_t *wpath)
319 {
320 WIN32_FIND_DATAW findbuf;
321 HANDLE handle;
322 wchar_t wbuf[MAX_PATH + 2];
323 wcscpy(wbuf, wpath);
324 wcscat(wbuf, L"\\*");
325 handle = FindFirstFileW(wbuf, &findbuf);
326 if (handle == INVALID_HANDLE_VALUE)
327 return GetLastError() == ERROR_NO_MORE_FILES;
328
329 while (!wcscmp(findbuf.cFileName, L".") ||
330 !wcscmp(findbuf.cFileName, L".."))
331 if (!FindNextFileW(handle, &findbuf)) {
332 DWORD err = GetLastError();
333 FindClose(handle);
334 return err == ERROR_NO_MORE_FILES;
335 }
336 FindClose(handle);
337 return 0;
338 }
339
340 int mingw_rmdir(const char *pathname)
341 {
342 int ret, tries = 0;
343 wchar_t wpathname[MAX_PATH];
344 struct stat st;
345
346 /*
347 * Contrary to Linux' `rmdir()`, Windows' _wrmdir() and _rmdir()
348 * (and `RemoveDirectoryW()`) will attempt to remove the target of a
349 * symbolic link (if it points to a directory).
350 *
351 * This behavior breaks the assumption of e.g. `remove_path()` which
352 * upon successful deletion of a file will attempt to remove its parent
353 * directories recursively until failure (which usually happens when
354 * the directory is not empty).
355 *
356 * Therefore, before calling `_wrmdir()`, we first check if the path is
357 * a symbolic link. If it is, we exit and return the same error as
358 * Linux' `rmdir()` would, i.e. `ENOTDIR`.
359 */
360 if (!mingw_lstat(pathname, &st) && S_ISLNK(st.st_mode)) {
361 errno = ENOTDIR;
362 return -1;
363 }
364
365 if (xutftowcs_path(wpathname, pathname) < 0)
366 return -1;
367
368 while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
369 if (!is_file_in_use_error(GetLastError()))
370 errno = err_win_to_posix(GetLastError());
371 if (errno != EACCES)
372 break;
373 if (!is_dir_empty(wpathname)) {
374 errno = ENOTEMPTY;
375 break;
376 }
377 /*
378 * We assume that some other process had the source or
379 * destination file open at the wrong moment and retry.
380 * In order to give the other process a higher chance to
381 * complete its operation, we give up our time slice now.
382 * If we have to retry again, we do sleep a bit.
383 */
384 Sleep(delay[tries]);
385 tries++;
386 }
387 while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
388 ask_yes_no_if_possible("Deletion of directory '%s' failed. "
389 "Should I try again?", pathname))
390 ret = _wrmdir(wpathname);
391 if (!ret)
392 invalidate_lstat_cache();
393 return ret;
394 }
395
396 static inline int needs_hiding(const char *path)
397 {
398 const char *basename;
399
400 if (hide_dotfiles == HIDE_DOTFILES_FALSE)
401 return 0;
402
403 /* We cannot use basename(), as it would remove trailing slashes */
404 win32_skip_dos_drive_prefix((char **)&path);
405 if (!*path)
406 return 0;
407
408 for (basename = path; *path; path++)
409 if (is_dir_sep(*path)) {
410 do {
411 path++;
412 } while (is_dir_sep(*path));
413 /* ignore trailing slashes */
414 if (*path)
415 basename = path;
416 else
417 break;
418 }
419
420 if (hide_dotfiles == HIDE_DOTFILES_TRUE)
421 return *basename == '.';
422
423 assert(hide_dotfiles == HIDE_DOTFILES_DOTGITONLY);
424 return !strncasecmp(".git", basename, 4) &&
425 (!basename[4] || is_dir_sep(basename[4]));
426 }
427
428 static int set_hidden_flag(const wchar_t *path, int set)
429 {
430 DWORD original = GetFileAttributesW(path), modified;
431 if (set)
432 modified = original | FILE_ATTRIBUTE_HIDDEN;
433 else
434 modified = original & ~FILE_ATTRIBUTE_HIDDEN;
435 if (original == modified || SetFileAttributesW(path, modified))
436 return 0;
437 errno = err_win_to_posix(GetLastError());
438 return -1;
439 }
440
441 int mingw_mkdir(const char *path, int mode)
442 {
443 int ret;
444 wchar_t wpath[MAX_PATH];
445
446 if (!is_valid_win32_path(path, 0)) {
447 errno = EINVAL;
448 return -1;
449 }
450
451 if (xutftowcs_path(wpath, path) < 0)
452 return -1;
453 ret = _wmkdir(wpath);
454 if (!ret && needs_hiding(path))
455 return set_hidden_flag(wpath, 1);
456 return ret;
457 }
458
459 /*
460 * Calling CreateFile() using FILE_APPEND_DATA and without FILE_WRITE_DATA
461 * is documented in [1] as opening a writable file handle in append mode.
462 * (It is believed that) this is atomic since it is maintained by the
463 * kernel unlike the O_APPEND flag which is racily maintained by the CRT.
464 *
465 * [1] https://docs.microsoft.com/en-us/windows/desktop/fileio/file-access-rights-constants
466 *
467 * This trick does not appear to work for named pipes. Instead it creates
468 * a named pipe client handle that cannot be written to. Callers should
469 * just use the regular _wopen() for them. (And since client handle gets
470 * bound to a unique server handle, it isn't really an issue.)
471 */
472 static int mingw_open_append(wchar_t const *wfilename, int oflags, ...)
473 {
474 HANDLE handle;
475 int fd;
476 DWORD create = (oflags & O_CREAT) ? OPEN_ALWAYS : OPEN_EXISTING;
477
478 /* only these flags are supported */
479 if ((oflags & ~O_CREAT) != (O_WRONLY | O_APPEND))
480 return errno = ENOSYS, -1;
481
482 /*
483 * FILE_SHARE_WRITE is required to permit child processes
484 * to append to the file.
485 */
486 handle = CreateFileW(wfilename, FILE_APPEND_DATA,
487 FILE_SHARE_WRITE | FILE_SHARE_READ,
488 NULL, create, FILE_ATTRIBUTE_NORMAL, NULL);
489 if (handle == INVALID_HANDLE_VALUE) {
490 DWORD err = GetLastError();
491
492 /*
493 * Some network storage solutions (e.g. Isilon) might return
494 * ERROR_INVALID_PARAMETER instead of expected error
495 * ERROR_PATH_NOT_FOUND, which results in an unknown error. If
496 * so, let's turn the error to ERROR_PATH_NOT_FOUND instead.
497 */
498 if (err == ERROR_INVALID_PARAMETER)
499 err = ERROR_PATH_NOT_FOUND;
500
501 errno = err_win_to_posix(err);
502 return -1;
503 }
504
505 /*
506 * No O_APPEND here, because the CRT uses it only to reset the
507 * file pointer to EOF before each write(); but that is not
508 * necessary (and may lead to races) for a file created with
509 * FILE_APPEND_DATA.
510 */
511 fd = _open_osfhandle((intptr_t)handle, O_BINARY);
512 if (fd < 0)
513 CloseHandle(handle);
514 return fd;
515 }
516
517 /*
518 * Does the pathname map to the local named pipe filesystem?
519 * That is, does it have a "//./pipe/" prefix?
520 */
521 static int is_local_named_pipe_path(const char *filename)
522 {
523 return (is_dir_sep(filename[0]) &&
524 is_dir_sep(filename[1]) &&
525 filename[2] == '.' &&
526 is_dir_sep(filename[3]) &&
527 !strncasecmp(filename+4, "pipe", 4) &&
528 is_dir_sep(filename[8]) &&
529 filename[9]);
530 }
531
532 int mingw_open (const char *filename, int oflags, ...)
533 {
534 typedef int (*open_fn_t)(wchar_t const *wfilename, int oflags, ...);
535 va_list args;
536 unsigned mode;
537 int fd, create = (oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL);
538 wchar_t wfilename[MAX_PATH];
539 open_fn_t open_fn;
540
541 va_start(args, oflags);
542 mode = va_arg(args, int);
543 va_end(args);
544
545 if (!is_valid_win32_path(filename, !create)) {
546 errno = create ? EINVAL : ENOENT;
547 return -1;
548 }
549
550 if ((oflags & O_APPEND) && !is_local_named_pipe_path(filename))
551 open_fn = mingw_open_append;
552 else
553 open_fn = _wopen;
554
555 if (filename && !strcmp(filename, "/dev/null"))
556 wcscpy(wfilename, L"nul");
557 else if (xutftowcs_path(wfilename, filename) < 0)
558 return -1;
559
560 fd = open_fn(wfilename, oflags, mode);
561
562 if (fd < 0 && (oflags & O_ACCMODE) != O_RDONLY && errno == EACCES) {
563 DWORD attrs = GetFileAttributesW(wfilename);
564 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
565 errno = EISDIR;
566 }
567 if ((oflags & O_CREAT) && needs_hiding(filename)) {
568 /*
569 * Internally, _wopen() uses the CreateFile() API which errors
570 * out with an ERROR_ACCESS_DENIED if CREATE_ALWAYS was
571 * specified and an already existing file's attributes do not
572 * match *exactly*. As there is no mode or flag we can set that
573 * would correspond to FILE_ATTRIBUTE_HIDDEN, let's just try
574 * again *without* the O_CREAT flag (that corresponds to the
575 * CREATE_ALWAYS flag of CreateFile()).
576 */
577 if (fd < 0 && errno == EACCES)
578 fd = open_fn(wfilename, oflags & ~O_CREAT, mode);
579 if (fd >= 0 && set_hidden_flag(wfilename, 1))
580 warning("could not mark '%s' as hidden.", filename);
581 }
582 return fd;
583 }
584
585 static BOOL WINAPI ctrl_ignore(DWORD type)
586 {
587 return TRUE;
588 }
589
590 #undef fgetc
591 int mingw_fgetc(FILE *stream)
592 {
593 int ch;
594 if (!isatty(_fileno(stream)))
595 return fgetc(stream);
596
597 SetConsoleCtrlHandler(ctrl_ignore, TRUE);
598 while (1) {
599 ch = fgetc(stream);
600 if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
601 break;
602
603 /* Ctrl+C was pressed, simulate SIGINT and retry */
604 mingw_raise(SIGINT);
605 }
606 SetConsoleCtrlHandler(ctrl_ignore, FALSE);
607 return ch;
608 }
609
610 #undef fopen
611 FILE *mingw_fopen (const char *filename, const char *otype)
612 {
613 int hide = needs_hiding(filename);
614 FILE *file;
615 wchar_t wfilename[MAX_PATH], wotype[4];
616 if (filename && !strcmp(filename, "/dev/null"))
617 wcscpy(wfilename, L"nul");
618 else if (!is_valid_win32_path(filename, 1)) {
619 int create = otype && strchr(otype, 'w');
620 errno = create ? EINVAL : ENOENT;
621 return NULL;
622 } else if (xutftowcs_path(wfilename, filename) < 0)
623 return NULL;
624
625 if (xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
626 return NULL;
627
628 if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
629 error("could not unhide %s", filename);
630 return NULL;
631 }
632 file = _wfopen(wfilename, wotype);
633 if (!file && GetLastError() == ERROR_INVALID_NAME)
634 errno = ENOENT;
635 if (file && hide && set_hidden_flag(wfilename, 1))
636 warning("could not mark '%s' as hidden.", filename);
637 return file;
638 }
639
640 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
641 {
642 int hide = needs_hiding(filename);
643 FILE *file;
644 wchar_t wfilename[MAX_PATH], wotype[4];
645 if (filename && !strcmp(filename, "/dev/null"))
646 wcscpy(wfilename, L"nul");
647 else if (!is_valid_win32_path(filename, 1)) {
648 int create = otype && strchr(otype, 'w');
649 errno = create ? EINVAL : ENOENT;
650 return NULL;
651 } else if (xutftowcs_path(wfilename, filename) < 0)
652 return NULL;
653
654 if (xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
655 return NULL;
656
657 if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
658 error("could not unhide %s", filename);
659 return NULL;
660 }
661 file = _wfreopen(wfilename, wotype, stream);
662 if (file && hide && set_hidden_flag(wfilename, 1))
663 warning("could not mark '%s' as hidden.", filename);
664 return file;
665 }
666
667 #undef fflush
668 int mingw_fflush(FILE *stream)
669 {
670 int ret = fflush(stream);
671
672 /*
673 * write() is used behind the scenes of stdio output functions.
674 * Since git code does not check for errors after each stdio write
675 * operation, it can happen that write() is called by a later
676 * stdio function even if an earlier write() call failed. In the
677 * case of a pipe whose readable end was closed, only the first
678 * call to write() reports EPIPE on Windows. Subsequent write()
679 * calls report EINVAL. It is impossible to notice whether this
680 * fflush invocation triggered such a case, therefore, we have to
681 * catch all EINVAL errors whole-sale.
682 */
683 if (ret && errno == EINVAL)
684 errno = EPIPE;
685
686 return ret;
687 }
688
689 #undef write
690 ssize_t mingw_write(int fd, const void *buf, size_t len)
691 {
692 ssize_t result = write(fd, buf, len);
693
694 if (result < 0 && errno == EINVAL && buf) {
695 /* check if fd is a pipe */
696 HANDLE h = (HANDLE) _get_osfhandle(fd);
697 if (GetFileType(h) == FILE_TYPE_PIPE)
698 errno = EPIPE;
699 else
700 errno = EINVAL;
701 }
702
703 return result;
704 }
705
706 int mingw_access(const char *filename, int mode)
707 {
708 wchar_t wfilename[MAX_PATH];
709 if (!strcmp("nul", filename) || !strcmp("/dev/null", filename))
710 return 0;
711 if (xutftowcs_path(wfilename, filename) < 0)
712 return -1;
713 /* X_OK is not supported by the MSVCRT version */
714 return _waccess(wfilename, mode & ~X_OK);
715 }
716
717 int mingw_chdir(const char *dirname)
718 {
719 wchar_t wdirname[MAX_PATH];
720 if (xutftowcs_path(wdirname, dirname) < 0)
721 return -1;
722 return _wchdir(wdirname);
723 }
724
725 int mingw_chmod(const char *filename, int mode)
726 {
727 wchar_t wfilename[MAX_PATH];
728 if (xutftowcs_path(wfilename, filename) < 0)
729 return -1;
730 return _wchmod(wfilename, mode);
731 }
732
733 /*
734 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
735 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
736 */
737 static inline long long filetime_to_hnsec(const FILETIME *ft)
738 {
739 long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
740 /* Windows to Unix Epoch conversion */
741 return winTime - 116444736000000000LL;
742 }
743
744 static inline void filetime_to_timespec(const FILETIME *ft, struct timespec *ts)
745 {
746 long long hnsec = filetime_to_hnsec(ft);
747 ts->tv_sec = (time_t)(hnsec / 10000000);
748 ts->tv_nsec = (hnsec % 10000000) * 100;
749 }
750
751 /**
752 * Verifies that safe_create_leading_directories() would succeed.
753 */
754 static int has_valid_directory_prefix(wchar_t *wfilename)
755 {
756 int n = wcslen(wfilename);
757
758 while (n > 0) {
759 wchar_t c = wfilename[--n];
760 DWORD attributes;
761
762 if (!is_dir_sep(c))
763 continue;
764
765 wfilename[n] = L'\0';
766 attributes = GetFileAttributesW(wfilename);
767 wfilename[n] = c;
768 if (attributes == FILE_ATTRIBUTE_DIRECTORY ||
769 attributes == FILE_ATTRIBUTE_DEVICE)
770 return 1;
771 if (attributes == INVALID_FILE_ATTRIBUTES)
772 switch (GetLastError()) {
773 case ERROR_PATH_NOT_FOUND:
774 continue;
775 case ERROR_FILE_NOT_FOUND:
776 /* This implies parent directory exists. */
777 return 1;
778 }
779 return 0;
780 }
781 return 1;
782 }
783
784 /* We keep the do_lstat code in a separate function to avoid recursion.
785 * When a path ends with a slash, the stat will fail with ENOENT. In
786 * this case, we strip the trailing slashes and stat again.
787 *
788 * If follow is true then act like stat() and report on the link
789 * target. Otherwise report on the link itself.
790 */
791 static int do_lstat(int follow, const char *file_name, struct stat *buf)
792 {
793 WIN32_FILE_ATTRIBUTE_DATA fdata;
794 wchar_t wfilename[MAX_PATH];
795 if (xutftowcs_path(wfilename, file_name) < 0)
796 return -1;
797
798 if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
799 buf->st_ino = 0;
800 buf->st_gid = 0;
801 buf->st_uid = 0;
802 buf->st_nlink = 1;
803 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
804 buf->st_size = fdata.nFileSizeLow |
805 (((off_t)fdata.nFileSizeHigh)<<32);
806 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
807 filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim));
808 filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim));
809 filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim));
810 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
811 WIN32_FIND_DATAW findbuf;
812 HANDLE handle = FindFirstFileW(wfilename, &findbuf);
813 if (handle != INVALID_HANDLE_VALUE) {
814 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
815 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
816 if (follow) {
817 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
818 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
819 } else {
820 buf->st_mode = S_IFLNK;
821 }
822 buf->st_mode |= S_IREAD;
823 if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
824 buf->st_mode |= S_IWRITE;
825 }
826 FindClose(handle);
827 }
828 }
829 return 0;
830 }
831 switch (GetLastError()) {
832 case ERROR_ACCESS_DENIED:
833 case ERROR_SHARING_VIOLATION:
834 case ERROR_LOCK_VIOLATION:
835 case ERROR_SHARING_BUFFER_EXCEEDED:
836 errno = EACCES;
837 break;
838 case ERROR_BUFFER_OVERFLOW:
839 errno = ENAMETOOLONG;
840 break;
841 case ERROR_NOT_ENOUGH_MEMORY:
842 errno = ENOMEM;
843 break;
844 case ERROR_PATH_NOT_FOUND:
845 if (!has_valid_directory_prefix(wfilename)) {
846 errno = ENOTDIR;
847 break;
848 }
849 /* fallthru */
850 default:
851 errno = ENOENT;
852 break;
853 }
854 return -1;
855 }
856
857 /* We provide our own lstat/fstat functions, since the provided
858 * lstat/fstat functions are so slow. These stat functions are
859 * tailored for Git's usage (read: fast), and are not meant to be
860 * complete. Note that Git stat()s are redirected to mingw_lstat()
861 * too, since Windows doesn't really handle symlinks that well.
862 */
863 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
864 {
865 int namelen;
866 char alt_name[PATH_MAX];
867
868 if (!do_lstat(follow, file_name, buf))
869 return 0;
870
871 /* if file_name ended in a '/', Windows returned ENOENT;
872 * try again without trailing slashes
873 */
874 if (errno != ENOENT)
875 return -1;
876
877 namelen = strlen(file_name);
878 if (namelen && file_name[namelen-1] != '/')
879 return -1;
880 while (namelen && file_name[namelen-1] == '/')
881 --namelen;
882 if (!namelen || namelen >= PATH_MAX)
883 return -1;
884
885 memcpy(alt_name, file_name, namelen);
886 alt_name[namelen] = 0;
887 return do_lstat(follow, alt_name, buf);
888 }
889
890 static int get_file_info_by_handle(HANDLE hnd, struct stat *buf)
891 {
892 BY_HANDLE_FILE_INFORMATION fdata;
893
894 if (!GetFileInformationByHandle(hnd, &fdata)) {
895 errno = err_win_to_posix(GetLastError());
896 return -1;
897 }
898
899 buf->st_ino = 0;
900 buf->st_gid = 0;
901 buf->st_uid = 0;
902 buf->st_nlink = 1;
903 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
904 buf->st_size = fdata.nFileSizeLow |
905 (((off_t)fdata.nFileSizeHigh)<<32);
906 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
907 filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim));
908 filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim));
909 filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim));
910 return 0;
911 }
912
913 int mingw_lstat(const char *file_name, struct stat *buf)
914 {
915 return do_stat_internal(0, file_name, buf);
916 }
917 int mingw_stat(const char *file_name, struct stat *buf)
918 {
919 return do_stat_internal(1, file_name, buf);
920 }
921
922 int mingw_fstat(int fd, struct stat *buf)
923 {
924 HANDLE fh = (HANDLE)_get_osfhandle(fd);
925 DWORD avail, type = GetFileType(fh) & ~FILE_TYPE_REMOTE;
926
927 switch (type) {
928 case FILE_TYPE_DISK:
929 return get_file_info_by_handle(fh, buf);
930
931 case FILE_TYPE_CHAR:
932 case FILE_TYPE_PIPE:
933 /* initialize stat fields */
934 memset(buf, 0, sizeof(*buf));
935 buf->st_nlink = 1;
936
937 if (type == FILE_TYPE_CHAR) {
938 buf->st_mode = _S_IFCHR;
939 } else {
940 buf->st_mode = _S_IFIFO;
941 if (PeekNamedPipe(fh, NULL, 0, NULL, &avail, NULL))
942 buf->st_size = avail;
943 }
944 return 0;
945
946 default:
947 errno = EBADF;
948 return -1;
949 }
950 }
951
952 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
953 {
954 long long winTime = t * 10000000LL + 116444736000000000LL;
955 ft->dwLowDateTime = winTime;
956 ft->dwHighDateTime = winTime >> 32;
957 }
958
959 int mingw_utime (const char *file_name, const struct utimbuf *times)
960 {
961 FILETIME mft, aft;
962 int fh, rc;
963 DWORD attrs;
964 wchar_t wfilename[MAX_PATH];
965 if (xutftowcs_path(wfilename, file_name) < 0)
966 return -1;
967
968 /* must have write permission */
969 attrs = GetFileAttributesW(wfilename);
970 if (attrs != INVALID_FILE_ATTRIBUTES &&
971 (attrs & FILE_ATTRIBUTE_READONLY)) {
972 /* ignore errors here; open() will report them */
973 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
974 }
975
976 if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
977 rc = -1;
978 goto revert_attrs;
979 }
980
981 if (times) {
982 time_t_to_filetime(times->modtime, &mft);
983 time_t_to_filetime(times->actime, &aft);
984 } else {
985 GetSystemTimeAsFileTime(&mft);
986 aft = mft;
987 }
988 if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
989 errno = EINVAL;
990 rc = -1;
991 } else
992 rc = 0;
993 close(fh);
994
995 revert_attrs:
996 if (attrs != INVALID_FILE_ATTRIBUTES &&
997 (attrs & FILE_ATTRIBUTE_READONLY)) {
998 /* ignore errors again */
999 SetFileAttributesW(wfilename, attrs);
1000 }
1001 return rc;
1002 }
1003
1004 #undef strftime
1005 size_t mingw_strftime(char *s, size_t max,
1006 const char *format, const struct tm *tm)
1007 {
1008 /* a pointer to the original strftime in case we can't find the UCRT version */
1009 static size_t (*fallback)(char *, size_t, const char *, const struct tm *) = strftime;
1010 size_t ret;
1011 DECLARE_PROC_ADDR(ucrtbase.dll, size_t, strftime, char *, size_t,
1012 const char *, const struct tm *);
1013
1014 if (INIT_PROC_ADDR(strftime))
1015 ret = strftime(s, max, format, tm);
1016 else
1017 ret = fallback(s, max, format, tm);
1018
1019 if (!ret && errno == EINVAL)
1020 die("invalid strftime format: '%s'", format);
1021 return ret;
1022 }
1023
1024 unsigned int sleep (unsigned int seconds)
1025 {
1026 Sleep(seconds*1000);
1027 return 0;
1028 }
1029
1030 char *mingw_mktemp(char *template)
1031 {
1032 wchar_t wtemplate[MAX_PATH];
1033 if (xutftowcs_path(wtemplate, template) < 0)
1034 return NULL;
1035 if (!_wmktemp(wtemplate))
1036 return NULL;
1037 if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
1038 return NULL;
1039 return template;
1040 }
1041
1042 int mkstemp(char *template)
1043 {
1044 char *filename = mktemp(template);
1045 if (filename == NULL)
1046 return -1;
1047 return open(filename, O_RDWR | O_CREAT, 0600);
1048 }
1049
1050 int gettimeofday(struct timeval *tv, void *tz)
1051 {
1052 FILETIME ft;
1053 long long hnsec;
1054
1055 GetSystemTimeAsFileTime(&ft);
1056 hnsec = filetime_to_hnsec(&ft);
1057 tv->tv_sec = hnsec / 10000000;
1058 tv->tv_usec = (hnsec % 10000000) / 10;
1059 return 0;
1060 }
1061
1062 int pipe(int filedes[2])
1063 {
1064 HANDLE h[2];
1065
1066 /* this creates non-inheritable handles */
1067 if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
1068 errno = err_win_to_posix(GetLastError());
1069 return -1;
1070 }
1071 filedes[0] = _open_osfhandle(HCAST(int, h[0]), O_NOINHERIT);
1072 if (filedes[0] < 0) {
1073 CloseHandle(h[0]);
1074 CloseHandle(h[1]);
1075 return -1;
1076 }
1077 filedes[1] = _open_osfhandle(HCAST(int, h[1]), O_NOINHERIT);
1078 if (filedes[1] < 0) {
1079 close(filedes[0]);
1080 CloseHandle(h[1]);
1081 return -1;
1082 }
1083 return 0;
1084 }
1085
1086 struct tm *gmtime_r(const time_t *timep, struct tm *result)
1087 {
1088 if (gmtime_s(result, timep) == 0)
1089 return result;
1090 return NULL;
1091 }
1092
1093 struct tm *localtime_r(const time_t *timep, struct tm *result)
1094 {
1095 if (localtime_s(result, timep) == 0)
1096 return result;
1097 return NULL;
1098 }
1099
1100 char *mingw_getcwd(char *pointer, int len)
1101 {
1102 wchar_t cwd[MAX_PATH], wpointer[MAX_PATH];
1103 DWORD ret = GetCurrentDirectoryW(ARRAY_SIZE(cwd), cwd);
1104
1105 if (!ret || ret >= ARRAY_SIZE(cwd)) {
1106 errno = ret ? ENAMETOOLONG : err_win_to_posix(GetLastError());
1107 return NULL;
1108 }
1109 ret = GetLongPathNameW(cwd, wpointer, ARRAY_SIZE(wpointer));
1110 if (!ret && GetLastError() == ERROR_ACCESS_DENIED) {
1111 HANDLE hnd = CreateFileW(cwd, 0,
1112 FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL,
1113 OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
1114 if (hnd == INVALID_HANDLE_VALUE)
1115 return NULL;
1116 ret = GetFinalPathNameByHandleW(hnd, wpointer, ARRAY_SIZE(wpointer), 0);
1117 CloseHandle(hnd);
1118 if (!ret || ret >= ARRAY_SIZE(wpointer))
1119 return NULL;
1120 if (xwcstoutf(pointer, normalize_ntpath(wpointer), len) < 0)
1121 return NULL;
1122 return pointer;
1123 }
1124 if (!ret || ret >= ARRAY_SIZE(wpointer))
1125 return NULL;
1126 if (xwcstoutf(pointer, wpointer, len) < 0)
1127 return NULL;
1128 convert_slashes(pointer);
1129 return pointer;
1130 }
1131
1132 /*
1133 * See "Parsing C++ Command-Line Arguments" at Microsoft's Docs:
1134 * https://docs.microsoft.com/en-us/cpp/cpp/parsing-cpp-command-line-arguments
1135 */
1136 static const char *quote_arg_msvc(const char *arg)
1137 {
1138 /* count chars to quote */
1139 int len = 0, n = 0;
1140 int force_quotes = 0;
1141 char *q, *d;
1142 const char *p = arg;
1143 if (!*p) force_quotes = 1;
1144 while (*p) {
1145 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
1146 force_quotes = 1;
1147 else if (*p == '"')
1148 n++;
1149 else if (*p == '\\') {
1150 int count = 0;
1151 while (*p == '\\') {
1152 count++;
1153 p++;
1154 len++;
1155 }
1156 if (*p == '"' || !*p)
1157 n += count*2 + 1;
1158 continue;
1159 }
1160 len++;
1161 p++;
1162 }
1163 if (!force_quotes && n == 0)
1164 return arg;
1165
1166 /* insert \ where necessary */
1167 d = q = xmalloc(st_add3(len, n, 3));
1168 *d++ = '"';
1169 while (*arg) {
1170 if (*arg == '"')
1171 *d++ = '\\';
1172 else if (*arg == '\\') {
1173 int count = 0;
1174 while (*arg == '\\') {
1175 count++;
1176 *d++ = *arg++;
1177 }
1178 if (*arg == '"' || !*arg) {
1179 while (count-- > 0)
1180 *d++ = '\\';
1181 /* don't escape the surrounding end quote */
1182 if (!*arg)
1183 break;
1184 *d++ = '\\';
1185 }
1186 }
1187 *d++ = *arg++;
1188 }
1189 *d++ = '"';
1190 *d++ = '\0';
1191 return q;
1192 }
1193
1194 #include "quote.h"
1195
1196 static const char *quote_arg_msys2(const char *arg)
1197 {
1198 struct strbuf buf = STRBUF_INIT;
1199 const char *p2 = arg, *p;
1200
1201 for (p = arg; *p; p++) {
1202 int ws = isspace(*p);
1203 if (!ws && *p != '\\' && *p != '"' && *p != '{' && *p != '\'' &&
1204 *p != '?' && *p != '*' && *p != '~')
1205 continue;
1206 if (!buf.len)
1207 strbuf_addch(&buf, '"');
1208 if (p != p2)
1209 strbuf_add(&buf, p2, p - p2);
1210 if (*p == '\\' || *p == '"')
1211 strbuf_addch(&buf, '\\');
1212 p2 = p;
1213 }
1214
1215 if (p == arg)
1216 strbuf_addch(&buf, '"');
1217 else if (!buf.len)
1218 return arg;
1219 else
1220 strbuf_add(&buf, p2, p - p2);
1221
1222 strbuf_addch(&buf, '"');
1223 return strbuf_detach(&buf, 0);
1224 }
1225
1226 static const char *parse_interpreter(const char *cmd)
1227 {
1228 static char buf[100];
1229 char *p, *opt;
1230 int n, fd;
1231
1232 /* don't even try a .exe */
1233 n = strlen(cmd);
1234 if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
1235 return NULL;
1236
1237 fd = open(cmd, O_RDONLY);
1238 if (fd < 0)
1239 return NULL;
1240 n = read(fd, buf, sizeof(buf)-1);
1241 close(fd);
1242 if (n < 4) /* at least '#!/x' and not error */
1243 return NULL;
1244
1245 if (buf[0] != '#' || buf[1] != '!')
1246 return NULL;
1247 buf[n] = '\0';
1248 p = buf + strcspn(buf, "\r\n");
1249 if (!*p)
1250 return NULL;
1251
1252 *p = '\0';
1253 if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
1254 return NULL;
1255 /* strip options */
1256 if ((opt = strchr(p+1, ' ')))
1257 *opt = '\0';
1258 return p+1;
1259 }
1260
1261 /*
1262 * exe_only means that we only want to detect .exe files, but not scripts
1263 * (which do not have an extension)
1264 */
1265 static char *lookup_prog(const char *dir, int dirlen, const char *cmd,
1266 int isexe, int exe_only)
1267 {
1268 char path[MAX_PATH];
1269 wchar_t wpath[MAX_PATH];
1270 snprintf(path, sizeof(path), "%.*s\\%s.exe", dirlen, dir, cmd);
1271
1272 if (xutftowcs_path(wpath, path) < 0)
1273 return NULL;
1274
1275 if (!isexe && _waccess(wpath, F_OK) == 0)
1276 return xstrdup(path);
1277 wpath[wcslen(wpath)-4] = '\0';
1278 if ((!exe_only || isexe) && _waccess(wpath, F_OK) == 0) {
1279 if (!(GetFileAttributesW(wpath) & FILE_ATTRIBUTE_DIRECTORY)) {
1280 path[strlen(path)-4] = '\0';
1281 return xstrdup(path);
1282 }
1283 }
1284 return NULL;
1285 }
1286
1287 /*
1288 * Determines the absolute path of cmd using the split path in path.
1289 * If cmd contains a slash or backslash, no lookup is performed.
1290 */
1291 static char *path_lookup(const char *cmd, int exe_only)
1292 {
1293 const char *path;
1294 char *prog = NULL;
1295 int len = strlen(cmd);
1296 int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
1297
1298 if (strpbrk(cmd, "/\\"))
1299 return xstrdup(cmd);
1300
1301 path = mingw_getenv("PATH");
1302 if (!path)
1303 return NULL;
1304
1305 while (!prog) {
1306 const char *sep = strchrnul(path, ';');
1307 int dirlen = sep - path;
1308 if (dirlen)
1309 prog = lookup_prog(path, dirlen, cmd, isexe, exe_only);
1310 if (!*sep)
1311 break;
1312 path = sep + 1;
1313 }
1314
1315 return prog;
1316 }
1317
1318 static const wchar_t *wcschrnul(const wchar_t *s, wchar_t c)
1319 {
1320 while (*s && *s != c)
1321 s++;
1322 return s;
1323 }
1324
1325 /* Compare only keys */
1326 static int wenvcmp(const void *a, const void *b)
1327 {
1328 wchar_t *p = *(wchar_t **)a, *q = *(wchar_t **)b;
1329 size_t p_len, q_len;
1330
1331 /* Find the keys */
1332 p_len = wcschrnul(p, L'=') - p;
1333 q_len = wcschrnul(q, L'=') - q;
1334
1335 /* If the length differs, include the shorter key's NUL */
1336 if (p_len < q_len)
1337 p_len++;
1338 else if (p_len > q_len)
1339 p_len = q_len + 1;
1340
1341 return _wcsnicmp(p, q, p_len);
1342 }
1343
1344 /*
1345 * Build an environment block combining the inherited environment
1346 * merged with the given list of settings.
1347 *
1348 * Values of the form "KEY=VALUE" in deltaenv override inherited values.
1349 * Values of the form "KEY" in deltaenv delete inherited values.
1350 *
1351 * Multiple entries in deltaenv for the same key are explicitly allowed.
1352 *
1353 * We return a contiguous block of UNICODE strings with a final trailing
1354 * zero word.
1355 */
1356 static wchar_t *make_environment_block(char **deltaenv)
1357 {
1358 wchar_t *wenv = GetEnvironmentStringsW(), *wdeltaenv, *result, *p;
1359 size_t wlen, s, delta_size, size;
1360
1361 wchar_t **array = NULL;
1362 size_t alloc = 0, nr = 0, i;
1363
1364 size = 1; /* for extra NUL at the end */
1365
1366 /* If there is no deltaenv to apply, simply return a copy. */
1367 if (!deltaenv || !*deltaenv) {
1368 for (p = wenv; p && *p; ) {
1369 size_t s = wcslen(p) + 1;
1370 size += s;
1371 p += s;
1372 }
1373
1374 ALLOC_ARRAY(result, size);
1375 COPY_ARRAY(result, wenv, size);
1376 FreeEnvironmentStringsW(wenv);
1377 return result;
1378 }
1379
1380 /*
1381 * If there is a deltaenv, let's accumulate all keys into `array`,
1382 * sort them using the stable git_stable_qsort() and then copy,
1383 * skipping duplicate keys
1384 */
1385 for (p = wenv; p && *p; ) {
1386 ALLOC_GROW(array, nr + 1, alloc);
1387 s = wcslen(p) + 1;
1388 array[nr++] = p;
1389 p += s;
1390 size += s;
1391 }
1392
1393 /* (over-)assess size needed for wchar version of deltaenv */
1394 for (delta_size = 0, i = 0; deltaenv[i]; i++)
1395 delta_size += strlen(deltaenv[i]) * 2 + 1;
1396 ALLOC_ARRAY(wdeltaenv, delta_size);
1397
1398 /* convert the deltaenv, appending to array */
1399 for (i = 0, p = wdeltaenv; deltaenv[i]; i++) {
1400 ALLOC_GROW(array, nr + 1, alloc);
1401 wlen = xutftowcs(p, deltaenv[i], wdeltaenv + delta_size - p);
1402 array[nr++] = p;
1403 p += wlen + 1;
1404 }
1405
1406 git_stable_qsort(array, nr, sizeof(*array), wenvcmp);
1407 ALLOC_ARRAY(result, size + delta_size);
1408
1409 for (p = result, i = 0; i < nr; i++) {
1410 /* Skip any duplicate keys; last one wins */
1411 while (i + 1 < nr && !wenvcmp(array + i, array + i + 1))
1412 i++;
1413
1414 /* Skip "to delete" entry */
1415 if (!wcschr(array[i], L'='))
1416 continue;
1417
1418 size = wcslen(array[i]) + 1;
1419 COPY_ARRAY(p, array[i], size);
1420 p += size;
1421 }
1422 *p = L'\0';
1423
1424 free(array);
1425 free(wdeltaenv);
1426 FreeEnvironmentStringsW(wenv);
1427 return result;
1428 }
1429
1430 static void do_unset_environment_variables(void)
1431 {
1432 static int done;
1433 char *p = unset_environment_variables;
1434
1435 if (done || !p)
1436 return;
1437 done = 1;
1438
1439 for (;;) {
1440 char *comma = strchr(p, ',');
1441
1442 if (comma)
1443 *comma = '\0';
1444 unsetenv(p);
1445 if (!comma)
1446 break;
1447 p = comma + 1;
1448 }
1449 }
1450
1451 struct pinfo_t {
1452 struct pinfo_t *next;
1453 pid_t pid;
1454 HANDLE proc;
1455 };
1456 static struct pinfo_t *pinfo = NULL;
1457 CRITICAL_SECTION pinfo_cs;
1458
1459 /* Used to match and chomp off path components */
1460 static inline int match_last_path_component(const char *path, size_t *len,
1461 const char *component)
1462 {
1463 size_t component_len = strlen(component);
1464 if (*len < component_len + 1 ||
1465 !is_dir_sep(path[*len - component_len - 1]) ||
1466 fspathncmp(path + *len - component_len, component, component_len))
1467 return 0;
1468 *len -= component_len + 1;
1469 /* chomp off repeated dir separators */
1470 while (*len > 0 && is_dir_sep(path[*len - 1]))
1471 (*len)--;
1472 return 1;
1473 }
1474
1475 static int is_msys2_sh(const char *cmd)
1476 {
1477 if (!cmd)
1478 return 0;
1479
1480 if (!strcmp(cmd, "sh")) {
1481 static int ret = -1;
1482 char *p;
1483
1484 if (ret >= 0)
1485 return ret;
1486
1487 p = path_lookup(cmd, 0);
1488 if (!p)
1489 ret = 0;
1490 else {
1491 size_t len = strlen(p);
1492
1493 ret = match_last_path_component(p, &len, "sh.exe") &&
1494 match_last_path_component(p, &len, "bin") &&
1495 match_last_path_component(p, &len, "usr");
1496 free(p);
1497 }
1498 return ret;
1499 }
1500
1501 if (ends_with(cmd, "\\sh.exe")) {
1502 static char *sh;
1503
1504 if (!sh)
1505 sh = path_lookup("sh", 0);
1506
1507 return !fspathcmp(cmd, sh);
1508 }
1509
1510 return 0;
1511 }
1512
1513 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1514 const char *dir,
1515 int prepend_cmd, int fhin, int fhout, int fherr)
1516 {
1517 static int restrict_handle_inheritance = -1;
1518 STARTUPINFOEXW si;
1519 PROCESS_INFORMATION pi;
1520 LPPROC_THREAD_ATTRIBUTE_LIST attr_list = NULL;
1521 HANDLE stdhandles[3];
1522 DWORD stdhandles_count = 0;
1523 SIZE_T size;
1524 struct strbuf args;
1525 wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1526 unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1527 BOOL ret;
1528 HANDLE cons;
1529 const char *(*quote_arg)(const char *arg) =
1530 is_msys2_sh(cmd ? cmd : *argv) ?
1531 quote_arg_msys2 : quote_arg_msvc;
1532 const char *strace_env;
1533
1534 /* Make sure to override previous errors, if any */
1535 errno = 0;
1536
1537 if (restrict_handle_inheritance < 0)
1538 restrict_handle_inheritance = core_restrict_inherited_handles;
1539 /*
1540 * The following code to restrict which handles are inherited seems
1541 * to work properly only on Windows 7 and later, so let's disable it
1542 * on Windows Vista and 2008.
1543 */
1544 if (restrict_handle_inheritance < 0)
1545 restrict_handle_inheritance = GetVersion() >> 16 >= 7601;
1546
1547 do_unset_environment_variables();
1548
1549 /* Determine whether or not we are associated to a console */
1550 cons = CreateFileW(L"CONOUT$", GENERIC_WRITE,
1551 FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1552 FILE_ATTRIBUTE_NORMAL, NULL);
1553 if (cons == INVALID_HANDLE_VALUE) {
1554 /* There is no console associated with this process.
1555 * Since the child is a console process, Windows
1556 * would normally create a console window. But
1557 * since we'll be redirecting std streams, we do
1558 * not need the console.
1559 * It is necessary to use DETACHED_PROCESS
1560 * instead of CREATE_NO_WINDOW to make ssh
1561 * recognize that it has no console.
1562 */
1563 flags |= DETACHED_PROCESS;
1564 } else {
1565 /* There is already a console. If we specified
1566 * DETACHED_PROCESS here, too, Windows would
1567 * disassociate the child from the console.
1568 * The same is true for CREATE_NO_WINDOW.
1569 * Go figure!
1570 */
1571 CloseHandle(cons);
1572 }
1573 memset(&si, 0, sizeof(si));
1574 si.StartupInfo.cb = sizeof(si);
1575 si.StartupInfo.hStdInput = winansi_get_osfhandle(fhin);
1576 si.StartupInfo.hStdOutput = winansi_get_osfhandle(fhout);
1577 si.StartupInfo.hStdError = winansi_get_osfhandle(fherr);
1578
1579 /* The list of handles cannot contain duplicates */
1580 if (si.StartupInfo.hStdInput != INVALID_HANDLE_VALUE)
1581 stdhandles[stdhandles_count++] = si.StartupInfo.hStdInput;
1582 if (si.StartupInfo.hStdOutput != INVALID_HANDLE_VALUE &&
1583 si.StartupInfo.hStdOutput != si.StartupInfo.hStdInput)
1584 stdhandles[stdhandles_count++] = si.StartupInfo.hStdOutput;
1585 if (si.StartupInfo.hStdError != INVALID_HANDLE_VALUE &&
1586 si.StartupInfo.hStdError != si.StartupInfo.hStdInput &&
1587 si.StartupInfo.hStdError != si.StartupInfo.hStdOutput)
1588 stdhandles[stdhandles_count++] = si.StartupInfo.hStdError;
1589 if (stdhandles_count)
1590 si.StartupInfo.dwFlags |= STARTF_USESTDHANDLES;
1591
1592 if (*argv && !strcmp(cmd, *argv))
1593 wcmd[0] = L'\0';
1594 else if (xutftowcs_path(wcmd, cmd) < 0)
1595 return -1;
1596 if (dir && xutftowcs_path(wdir, dir) < 0)
1597 return -1;
1598
1599 /* concatenate argv, quoting args as we go */
1600 strbuf_init(&args, 0);
1601 if (prepend_cmd) {
1602 char *quoted = (char *)quote_arg(cmd);
1603 strbuf_addstr(&args, quoted);
1604 if (quoted != cmd)
1605 free(quoted);
1606 }
1607 for (; *argv; argv++) {
1608 char *quoted = (char *)quote_arg(*argv);
1609 if (*args.buf)
1610 strbuf_addch(&args, ' ');
1611 strbuf_addstr(&args, quoted);
1612 if (quoted != *argv)
1613 free(quoted);
1614 }
1615
1616 strace_env = getenv("GIT_STRACE_COMMANDS");
1617 if (strace_env) {
1618 char *p = path_lookup("strace.exe", 1);
1619 if (!p)
1620 return error("strace not found!");
1621 if (xutftowcs_path(wcmd, p) < 0) {
1622 free(p);
1623 return -1;
1624 }
1625 free(p);
1626 if (!strcmp("1", strace_env) ||
1627 !strcasecmp("yes", strace_env) ||
1628 !strcasecmp("true", strace_env))
1629 strbuf_insert(&args, 0, "strace ", 7);
1630 else {
1631 const char *quoted = quote_arg(strace_env);
1632 struct strbuf buf = STRBUF_INIT;
1633 strbuf_addf(&buf, "strace -o %s ", quoted);
1634 if (quoted != strace_env)
1635 free((char *)quoted);
1636 strbuf_insert(&args, 0, buf.buf, buf.len);
1637 strbuf_release(&buf);
1638 }
1639 }
1640
1641 ALLOC_ARRAY(wargs, st_add(st_mult(2, args.len), 1));
1642 xutftowcs(wargs, args.buf, 2 * args.len + 1);
1643 strbuf_release(&args);
1644
1645 wenvblk = make_environment_block(deltaenv);
1646
1647 memset(&pi, 0, sizeof(pi));
1648 if (restrict_handle_inheritance && stdhandles_count &&
1649 (InitializeProcThreadAttributeList(NULL, 1, 0, &size) ||
1650 GetLastError() == ERROR_INSUFFICIENT_BUFFER) &&
1651 (attr_list = (LPPROC_THREAD_ATTRIBUTE_LIST)
1652 (HeapAlloc(GetProcessHeap(), 0, size))) &&
1653 InitializeProcThreadAttributeList(attr_list, 1, 0, &size) &&
1654 UpdateProcThreadAttribute(attr_list, 0,
1655 PROC_THREAD_ATTRIBUTE_HANDLE_LIST,
1656 stdhandles,
1657 stdhandles_count * sizeof(HANDLE),
1658 NULL, NULL)) {
1659 si.lpAttributeList = attr_list;
1660 flags |= EXTENDED_STARTUPINFO_PRESENT;
1661 }
1662
1663 ret = CreateProcessW(*wcmd ? wcmd : NULL, wargs, NULL, NULL,
1664 stdhandles_count ? TRUE : FALSE,
1665 flags, wenvblk, dir ? wdir : NULL,
1666 &si.StartupInfo, &pi);
1667
1668 /*
1669 * On Windows 2008 R2, it seems that specifying certain types of handles
1670 * (such as FILE_TYPE_CHAR or FILE_TYPE_PIPE) will always produce an
1671 * error. Rather than playing finicky and fragile games, let's just try
1672 * to detect this situation and simply try again without restricting any
1673 * handle inheritance. This is still better than failing to create
1674 * processes.
1675 */
1676 if (!ret && restrict_handle_inheritance && stdhandles_count) {
1677 DWORD err = GetLastError();
1678 struct strbuf buf = STRBUF_INIT;
1679
1680 if (err != ERROR_NO_SYSTEM_RESOURCES &&
1681 /*
1682 * On Windows 7 and earlier, handles on pipes and character
1683 * devices are inherited automatically, and cannot be
1684 * specified in the thread handle list. Rather than trying
1685 * to catch each and every corner case (and running the
1686 * chance of *still* forgetting a few), let's just fall
1687 * back to creating the process without trying to limit the
1688 * handle inheritance.
1689 */
1690 !(err == ERROR_INVALID_PARAMETER &&
1691 GetVersion() >> 16 < 9200) &&
1692 !getenv("SUPPRESS_HANDLE_INHERITANCE_WARNING")) {
1693 DWORD fl = 0;
1694 int i;
1695
1696 setenv("SUPPRESS_HANDLE_INHERITANCE_WARNING", "1", 1);
1697
1698 for (i = 0; i < stdhandles_count; i++) {
1699 HANDLE h = stdhandles[i];
1700 strbuf_addf(&buf, "handle #%d: %p (type %lx, "
1701 "handle info (%d) %lx\n", i, h,
1702 GetFileType(h),
1703 GetHandleInformation(h, &fl),
1704 fl);
1705 }
1706 strbuf_addstr(&buf, "\nThis is a bug; please report it "
1707 "at\nhttps://github.com/git-for-windows/"
1708 "git/issues/new\n\n"
1709 "To suppress this warning, please set "
1710 "the environment variable\n\n"
1711 "\tSUPPRESS_HANDLE_INHERITANCE_WARNING=1"
1712 "\n");
1713 }
1714 restrict_handle_inheritance = 0;
1715 flags &= ~EXTENDED_STARTUPINFO_PRESENT;
1716 ret = CreateProcessW(*wcmd ? wcmd : NULL, wargs, NULL, NULL,
1717 TRUE, flags, wenvblk, dir ? wdir : NULL,
1718 &si.StartupInfo, &pi);
1719 if (!ret)
1720 errno = err_win_to_posix(GetLastError());
1721 if (ret && buf.len) {
1722 warning("failed to restrict file handles (%ld)\n\n%s",
1723 err, buf.buf);
1724 }
1725 strbuf_release(&buf);
1726 } else if (!ret)
1727 errno = err_win_to_posix(GetLastError());
1728
1729 if (si.lpAttributeList)
1730 DeleteProcThreadAttributeList(si.lpAttributeList);
1731 if (attr_list)
1732 HeapFree(GetProcessHeap(), 0, attr_list);
1733
1734 free(wenvblk);
1735 free(wargs);
1736
1737 if (!ret)
1738 return -1;
1739
1740 CloseHandle(pi.hThread);
1741
1742 /*
1743 * The process ID is the human-readable identifier of the process
1744 * that we want to present in log and error messages. The handle
1745 * is not useful for this purpose. But we cannot close it, either,
1746 * because it is not possible to turn a process ID into a process
1747 * handle after the process terminated.
1748 * Keep the handle in a list for waitpid.
1749 */
1750 EnterCriticalSection(&pinfo_cs);
1751 {
1752 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1753 info->pid = pi.dwProcessId;
1754 info->proc = pi.hProcess;
1755 info->next = pinfo;
1756 pinfo = info;
1757 }
1758 LeaveCriticalSection(&pinfo_cs);
1759
1760 return (pid_t)pi.dwProcessId;
1761 }
1762
1763 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1764 {
1765 return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1766 }
1767
1768 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1769 const char *dir,
1770 int fhin, int fhout, int fherr)
1771 {
1772 pid_t pid;
1773 char *prog = path_lookup(cmd, 0);
1774
1775 if (!prog) {
1776 errno = ENOENT;
1777 pid = -1;
1778 }
1779 else {
1780 const char *interpr = parse_interpreter(prog);
1781
1782 if (interpr) {
1783 const char *argv0 = argv[0];
1784 char *iprog = path_lookup(interpr, 1);
1785 argv[0] = prog;
1786 if (!iprog) {
1787 errno = ENOENT;
1788 pid = -1;
1789 }
1790 else {
1791 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1792 fhin, fhout, fherr);
1793 free(iprog);
1794 }
1795 argv[0] = argv0;
1796 }
1797 else
1798 pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1799 fhin, fhout, fherr);
1800 free(prog);
1801 }
1802 return pid;
1803 }
1804
1805 static int try_shell_exec(const char *cmd, char *const *argv)
1806 {
1807 const char *interpr = parse_interpreter(cmd);
1808 char *prog;
1809 int pid = 0;
1810
1811 if (!interpr)
1812 return 0;
1813 prog = path_lookup(interpr, 1);
1814 if (prog) {
1815 int exec_id;
1816 int argc = 0;
1817 #ifndef _MSC_VER
1818 const
1819 #endif
1820 char **argv2;
1821 while (argv[argc]) argc++;
1822 ALLOC_ARRAY(argv2, argc + 1);
1823 argv2[0] = (char *)cmd; /* full path to the script file */
1824 COPY_ARRAY(&argv2[1], &argv[1], argc);
1825 exec_id = trace2_exec(prog, argv2);
1826 pid = mingw_spawnv(prog, argv2, 1);
1827 if (pid >= 0) {
1828 int status;
1829 if (waitpid(pid, &status, 0) < 0)
1830 status = 255;
1831 trace2_exec_result(exec_id, status);
1832 exit(status);
1833 }
1834 trace2_exec_result(exec_id, -1);
1835 pid = 1; /* indicate that we tried but failed */
1836 free(prog);
1837 free(argv2);
1838 }
1839 return pid;
1840 }
1841
1842 int mingw_execv(const char *cmd, char *const *argv)
1843 {
1844 /* check if git_command is a shell script */
1845 if (!try_shell_exec(cmd, argv)) {
1846 int pid, status;
1847 int exec_id;
1848
1849 exec_id = trace2_exec(cmd, (const char **)argv);
1850 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1851 if (pid < 0) {
1852 trace2_exec_result(exec_id, -1);
1853 return -1;
1854 }
1855 if (waitpid(pid, &status, 0) < 0)
1856 status = 255;
1857 trace2_exec_result(exec_id, status);
1858 exit(status);
1859 }
1860 return -1;
1861 }
1862
1863 int mingw_execvp(const char *cmd, char *const *argv)
1864 {
1865 char *prog = path_lookup(cmd, 0);
1866
1867 if (prog) {
1868 mingw_execv(prog, argv);
1869 free(prog);
1870 } else
1871 errno = ENOENT;
1872
1873 return -1;
1874 }
1875
1876 int mingw_kill(pid_t pid, int sig)
1877 {
1878 if (pid > 0 && sig == SIGTERM) {
1879 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1880
1881 if (TerminateProcess(h, -1)) {
1882 CloseHandle(h);
1883 return 0;
1884 }
1885
1886 errno = err_win_to_posix(GetLastError());
1887 CloseHandle(h);
1888 return -1;
1889 } else if (pid > 0 && sig == 0) {
1890 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1891 if (h) {
1892 CloseHandle(h);
1893 return 0;
1894 }
1895 }
1896
1897 errno = EINVAL;
1898 return -1;
1899 }
1900
1901 /*
1902 * UTF-8 versions of getenv(), putenv() and unsetenv().
1903 * Internally, they use the CRT's stock UNICODE routines
1904 * to avoid data loss.
1905 */
1906 char *mingw_getenv(const char *name)
1907 {
1908 #define GETENV_MAX_RETAIN 64
1909 static char *values[GETENV_MAX_RETAIN];
1910 static int value_counter;
1911 int len_key, len_value;
1912 wchar_t *w_key;
1913 char *value;
1914 wchar_t w_value[32768];
1915
1916 if (!name || !*name)
1917 return NULL;
1918
1919 len_key = strlen(name) + 1;
1920 /* We cannot use xcalloc() here because that uses getenv() itself */
1921 w_key = calloc(len_key, sizeof(wchar_t));
1922 if (!w_key)
1923 die("Out of memory, (tried to allocate %u wchar_t's)", len_key);
1924 xutftowcs(w_key, name, len_key);
1925 /* GetEnvironmentVariableW() only sets the last error upon failure */
1926 SetLastError(ERROR_SUCCESS);
1927 len_value = GetEnvironmentVariableW(w_key, w_value, ARRAY_SIZE(w_value));
1928 if (!len_value && GetLastError() == ERROR_ENVVAR_NOT_FOUND) {
1929 free(w_key);
1930 return NULL;
1931 }
1932 free(w_key);
1933
1934 len_value = len_value * 3 + 1;
1935 /* We cannot use xcalloc() here because that uses getenv() itself */
1936 value = calloc(len_value, sizeof(char));
1937 if (!value)
1938 die("Out of memory, (tried to allocate %u bytes)", len_value);
1939 xwcstoutf(value, w_value, len_value);
1940
1941 /*
1942 * We return `value` which is an allocated value and the caller is NOT
1943 * expecting to have to free it, so we keep a round-robin array,
1944 * invalidating the buffer after GETENV_MAX_RETAIN getenv() calls.
1945 */
1946 free(values[value_counter]);
1947 values[value_counter++] = value;
1948 if (value_counter >= ARRAY_SIZE(values))
1949 value_counter = 0;
1950
1951 return value;
1952 }
1953
1954 int mingw_putenv(const char *namevalue)
1955 {
1956 int size;
1957 wchar_t *wide, *equal;
1958 BOOL result;
1959
1960 if (!namevalue || !*namevalue)
1961 return 0;
1962
1963 size = strlen(namevalue) * 2 + 1;
1964 wide = calloc(size, sizeof(wchar_t));
1965 if (!wide)
1966 die("Out of memory, (tried to allocate %u wchar_t's)", size);
1967 xutftowcs(wide, namevalue, size);
1968 equal = wcschr(wide, L'=');
1969 if (!equal)
1970 result = SetEnvironmentVariableW(wide, NULL);
1971 else {
1972 *equal = L'\0';
1973 result = SetEnvironmentVariableW(wide, equal + 1);
1974 }
1975 free(wide);
1976
1977 if (!result)
1978 errno = err_win_to_posix(GetLastError());
1979
1980 return result ? 0 : -1;
1981 }
1982
1983 static void ensure_socket_initialization(void)
1984 {
1985 WSADATA wsa;
1986 static int initialized = 0;
1987
1988 if (initialized)
1989 return;
1990
1991 if (WSAStartup(MAKEWORD(2,2), &wsa))
1992 die("unable to initialize winsock subsystem, error %d",
1993 WSAGetLastError());
1994
1995 atexit((void(*)(void)) WSACleanup);
1996 initialized = 1;
1997 }
1998
1999 #undef gethostname
2000 int mingw_gethostname(char *name, int namelen)
2001 {
2002 ensure_socket_initialization();
2003 return gethostname(name, namelen);
2004 }
2005
2006 #undef gethostbyname
2007 struct hostent *mingw_gethostbyname(const char *host)
2008 {
2009 ensure_socket_initialization();
2010 return gethostbyname(host);
2011 }
2012
2013 #undef getaddrinfo
2014 int mingw_getaddrinfo(const char *node, const char *service,
2015 const struct addrinfo *hints, struct addrinfo **res)
2016 {
2017 ensure_socket_initialization();
2018 return getaddrinfo(node, service, hints, res);
2019 }
2020
2021 int mingw_socket(int domain, int type, int protocol)
2022 {
2023 int sockfd;
2024 SOCKET s;
2025
2026 ensure_socket_initialization();
2027 s = WSASocket(domain, type, protocol, NULL, 0, 0);
2028 if (s == INVALID_SOCKET) {
2029 /*
2030 * WSAGetLastError() values are regular BSD error codes
2031 * biased by WSABASEERR.
2032 * However, strerror() does not know about networking
2033 * specific errors, which are values beginning at 38 or so.
2034 * Therefore, we choose to leave the biased error code
2035 * in errno so that _if_ someone looks up the code somewhere,
2036 * then it is at least the number that are usually listed.
2037 */
2038 errno = WSAGetLastError();
2039 return -1;
2040 }
2041 /* convert into a file descriptor */
2042 if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
2043 closesocket(s);
2044 return error("unable to make a socket file descriptor: %s",
2045 strerror(errno));
2046 }
2047 return sockfd;
2048 }
2049
2050 #undef connect
2051 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
2052 {
2053 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
2054 return connect(s, sa, sz);
2055 }
2056
2057 #undef bind
2058 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
2059 {
2060 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
2061 return bind(s, sa, sz);
2062 }
2063
2064 #undef setsockopt
2065 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
2066 {
2067 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
2068 return setsockopt(s, lvl, optname, (const char*)optval, optlen);
2069 }
2070
2071 #undef shutdown
2072 int mingw_shutdown(int sockfd, int how)
2073 {
2074 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
2075 return shutdown(s, how);
2076 }
2077
2078 #undef listen
2079 int mingw_listen(int sockfd, int backlog)
2080 {
2081 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
2082 return listen(s, backlog);
2083 }
2084
2085 #undef accept
2086 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
2087 {
2088 int sockfd2;
2089
2090 SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
2091 SOCKET s2 = accept(s1, sa, sz);
2092
2093 /* convert into a file descriptor */
2094 if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
2095 int err = errno;
2096 closesocket(s2);
2097 return error("unable to make a socket file descriptor: %s",
2098 strerror(err));
2099 }
2100 return sockfd2;
2101 }
2102
2103 #undef rename
2104 int mingw_rename(const char *pold, const char *pnew)
2105 {
2106 DWORD attrs, gle;
2107 int tries = 0;
2108 wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
2109 if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
2110 return -1;
2111
2112 /*
2113 * Try native rename() first to get errno right.
2114 * It is based on MoveFile(), which cannot overwrite existing files.
2115 */
2116 if (!_wrename(wpold, wpnew))
2117 return 0;
2118 if (errno != EEXIST)
2119 return -1;
2120 repeat:
2121 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
2122 return 0;
2123 /* TODO: translate more errors */
2124 gle = GetLastError();
2125 if (gle == ERROR_ACCESS_DENIED &&
2126 (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
2127 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
2128 DWORD attrsold = GetFileAttributesW(wpold);
2129 if (attrsold == INVALID_FILE_ATTRIBUTES ||
2130 !(attrsold & FILE_ATTRIBUTE_DIRECTORY))
2131 errno = EISDIR;
2132 else if (!_wrmdir(wpnew))
2133 goto repeat;
2134 return -1;
2135 }
2136 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
2137 SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
2138 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
2139 return 0;
2140 gle = GetLastError();
2141 /* revert file attributes on failure */
2142 SetFileAttributesW(wpnew, attrs);
2143 }
2144 }
2145 if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
2146 /*
2147 * We assume that some other process had the source or
2148 * destination file open at the wrong moment and retry.
2149 * In order to give the other process a higher chance to
2150 * complete its operation, we give up our time slice now.
2151 * If we have to retry again, we do sleep a bit.
2152 */
2153 Sleep(delay[tries]);
2154 tries++;
2155 goto repeat;
2156 }
2157 if (gle == ERROR_ACCESS_DENIED &&
2158 ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
2159 "Should I try again?", pold, pnew))
2160 goto repeat;
2161
2162 errno = EACCES;
2163 return -1;
2164 }
2165
2166 /*
2167 * Note that this doesn't return the actual pagesize, but
2168 * the allocation granularity. If future Windows specific git code
2169 * needs the real getpagesize function, we need to find another solution.
2170 */
2171 int mingw_getpagesize(void)
2172 {
2173 SYSTEM_INFO si;
2174 GetSystemInfo(&si);
2175 return si.dwAllocationGranularity;
2176 }
2177
2178 /* See https://msdn.microsoft.com/en-us/library/windows/desktop/ms724435.aspx */
2179 enum EXTENDED_NAME_FORMAT {
2180 NameDisplay = 3,
2181 NameUserPrincipal = 8
2182 };
2183
2184 static char *get_extended_user_info(enum EXTENDED_NAME_FORMAT type)
2185 {
2186 DECLARE_PROC_ADDR(secur32.dll, BOOL, GetUserNameExW,
2187 enum EXTENDED_NAME_FORMAT, LPCWSTR, PULONG);
2188 static wchar_t wbuffer[1024];
2189 DWORD len;
2190
2191 if (!INIT_PROC_ADDR(GetUserNameExW))
2192 return NULL;
2193
2194 len = ARRAY_SIZE(wbuffer);
2195 if (GetUserNameExW(type, wbuffer, &len)) {
2196 char *converted = xmalloc((len *= 3));
2197 if (xwcstoutf(converted, wbuffer, len) >= 0)
2198 return converted;
2199 free(converted);
2200 }
2201
2202 return NULL;
2203 }
2204
2205 char *mingw_query_user_email(void)
2206 {
2207 return get_extended_user_info(NameUserPrincipal);
2208 }
2209
2210 struct passwd *getpwuid(int uid)
2211 {
2212 static unsigned initialized;
2213 static char user_name[100];
2214 static struct passwd *p;
2215 wchar_t buf[100];
2216 DWORD len;
2217
2218 if (initialized)
2219 return p;
2220
2221 len = ARRAY_SIZE(buf);
2222 if (!GetUserNameW(buf, &len)) {
2223 initialized = 1;
2224 return NULL;
2225 }
2226
2227 if (xwcstoutf(user_name, buf, sizeof(user_name)) < 0) {
2228 initialized = 1;
2229 return NULL;
2230 }
2231
2232 p = xmalloc(sizeof(*p));
2233 p->pw_name = user_name;
2234 p->pw_gecos = get_extended_user_info(NameDisplay);
2235 if (!p->pw_gecos)
2236 p->pw_gecos = "unknown";
2237 p->pw_dir = NULL;
2238
2239 initialized = 1;
2240 return p;
2241 }
2242
2243 static HANDLE timer_event;
2244 static HANDLE timer_thread;
2245 static int timer_interval;
2246 static int one_shot;
2247 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
2248
2249 /* The timer works like this:
2250 * The thread, ticktack(), is a trivial routine that most of the time
2251 * only waits to receive the signal to terminate. The main thread tells
2252 * the thread to terminate by setting the timer_event to the signalled
2253 * state.
2254 * But ticktack() interrupts the wait state after the timer's interval
2255 * length to call the signal handler.
2256 */
2257
2258 static unsigned __stdcall ticktack(void *dummy)
2259 {
2260 while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
2261 mingw_raise(SIGALRM);
2262 if (one_shot)
2263 break;
2264 }
2265 return 0;
2266 }
2267
2268 static int start_timer_thread(void)
2269 {
2270 timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
2271 if (timer_event) {
2272 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
2273 if (!timer_thread )
2274 return errno = ENOMEM,
2275 error("cannot start timer thread");
2276 } else
2277 return errno = ENOMEM,
2278 error("cannot allocate resources for timer");
2279 return 0;
2280 }
2281
2282 static void stop_timer_thread(void)
2283 {
2284 if (timer_event)
2285 SetEvent(timer_event); /* tell thread to terminate */
2286 if (timer_thread) {
2287 int rc = WaitForSingleObject(timer_thread, 10000);
2288 if (rc == WAIT_TIMEOUT)
2289 error("timer thread did not terminate timely");
2290 else if (rc != WAIT_OBJECT_0)
2291 error("waiting for timer thread failed: %lu",
2292 GetLastError());
2293 CloseHandle(timer_thread);
2294 }
2295 if (timer_event)
2296 CloseHandle(timer_event);
2297 timer_event = NULL;
2298 timer_thread = NULL;
2299 }
2300
2301 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
2302 {
2303 return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
2304 }
2305
2306 int setitimer(int type, struct itimerval *in, struct itimerval *out)
2307 {
2308 static const struct timeval zero;
2309 static int atexit_done;
2310
2311 if (out != NULL)
2312 return errno = EINVAL,
2313 error("setitimer param 3 != NULL not implemented");
2314 if (!is_timeval_eq(&in->it_interval, &zero) &&
2315 !is_timeval_eq(&in->it_interval, &in->it_value))
2316 return errno = EINVAL,
2317 error("setitimer: it_interval must be zero or eq it_value");
2318
2319 if (timer_thread)
2320 stop_timer_thread();
2321
2322 if (is_timeval_eq(&in->it_value, &zero) &&
2323 is_timeval_eq(&in->it_interval, &zero))
2324 return 0;
2325
2326 timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
2327 one_shot = is_timeval_eq(&in->it_interval, &zero);
2328 if (!atexit_done) {
2329 atexit(stop_timer_thread);
2330 atexit_done = 1;
2331 }
2332 return start_timer_thread();
2333 }
2334
2335 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
2336 {
2337 if (sig != SIGALRM)
2338 return errno = EINVAL,
2339 error("sigaction only implemented for SIGALRM");
2340 if (out != NULL)
2341 return errno = EINVAL,
2342 error("sigaction: param 3 != NULL not implemented");
2343
2344 timer_fn = in->sa_handler;
2345 return 0;
2346 }
2347
2348 #undef signal
2349 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
2350 {
2351 sig_handler_t old;
2352
2353 switch (sig) {
2354 case SIGALRM:
2355 old = timer_fn;
2356 timer_fn = handler;
2357 break;
2358
2359 case SIGINT:
2360 old = sigint_fn;
2361 sigint_fn = handler;
2362 break;
2363
2364 default:
2365 return signal(sig, handler);
2366 }
2367
2368 return old;
2369 }
2370
2371 #undef raise
2372 int mingw_raise(int sig)
2373 {
2374 switch (sig) {
2375 case SIGALRM:
2376 if (timer_fn == SIG_DFL) {
2377 if (isatty(STDERR_FILENO))
2378 fputs("Alarm clock\n", stderr);
2379 exit(128 + SIGALRM);
2380 } else if (timer_fn != SIG_IGN)
2381 timer_fn(SIGALRM);
2382 return 0;
2383
2384 case SIGINT:
2385 if (sigint_fn == SIG_DFL)
2386 exit(128 + SIGINT);
2387 else if (sigint_fn != SIG_IGN)
2388 sigint_fn(SIGINT);
2389 return 0;
2390
2391 #if defined(_MSC_VER)
2392 case SIGILL:
2393 case SIGFPE:
2394 case SIGSEGV:
2395 case SIGTERM:
2396 case SIGBREAK:
2397 case SIGABRT:
2398 case SIGABRT_COMPAT:
2399 /*
2400 * The <signal.h> header in the MS C Runtime defines 8 signals
2401 * as being supported on the platform. Anything else causes an
2402 * "Invalid signal or error" (which in DEBUG builds causes the
2403 * Abort/Retry/Ignore dialog). We by-pass the CRT for things we
2404 * already know will fail.
2405 */
2406 return raise(sig);
2407 default:
2408 errno = EINVAL;
2409 return -1;
2410
2411 #else
2412
2413 default:
2414 return raise(sig);
2415
2416 #endif
2417
2418 }
2419 }
2420
2421 int link(const char *oldpath, const char *newpath)
2422 {
2423 wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
2424 if (xutftowcs_path(woldpath, oldpath) < 0 ||
2425 xutftowcs_path(wnewpath, newpath) < 0)
2426 return -1;
2427
2428 if (!CreateHardLinkW(wnewpath, woldpath, NULL)) {
2429 errno = err_win_to_posix(GetLastError());
2430 return -1;
2431 }
2432 return 0;
2433 }
2434
2435 pid_t waitpid(pid_t pid, int *status, int options)
2436 {
2437 HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
2438 FALSE, pid);
2439 if (!h) {
2440 errno = ECHILD;
2441 return -1;
2442 }
2443
2444 if (pid > 0 && options & WNOHANG) {
2445 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
2446 CloseHandle(h);
2447 return 0;
2448 }
2449 options &= ~WNOHANG;
2450 }
2451
2452 if (options == 0) {
2453 struct pinfo_t **ppinfo;
2454 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
2455 CloseHandle(h);
2456 return 0;
2457 }
2458
2459 if (status)
2460 GetExitCodeProcess(h, (LPDWORD)status);
2461
2462 EnterCriticalSection(&pinfo_cs);
2463
2464 ppinfo = &pinfo;
2465 while (*ppinfo) {
2466 struct pinfo_t *info = *ppinfo;
2467 if (info->pid == pid) {
2468 CloseHandle(info->proc);
2469 *ppinfo = info->next;
2470 free(info);
2471 break;
2472 }
2473 ppinfo = &info->next;
2474 }
2475
2476 LeaveCriticalSection(&pinfo_cs);
2477
2478 CloseHandle(h);
2479 return pid;
2480 }
2481 CloseHandle(h);
2482
2483 errno = EINVAL;
2484 return -1;
2485 }
2486
2487 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
2488 {
2489 int upos = 0, wpos = 0;
2490 const unsigned char *utf = (const unsigned char*) utfs;
2491 if (!utf || !wcs || wcslen < 1) {
2492 errno = EINVAL;
2493 return -1;
2494 }
2495 /* reserve space for \0 */
2496 wcslen--;
2497 if (utflen < 0)
2498 utflen = INT_MAX;
2499
2500 while (upos < utflen) {
2501 int c = utf[upos++] & 0xff;
2502 if (utflen == INT_MAX && c == 0)
2503 break;
2504
2505 if (wpos >= wcslen) {
2506 wcs[wpos] = 0;
2507 errno = ERANGE;
2508 return -1;
2509 }
2510
2511 if (c < 0x80) {
2512 /* ASCII */
2513 wcs[wpos++] = c;
2514 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2515 (utf[upos] & 0xc0) == 0x80) {
2516 /* 2-byte utf-8 */
2517 c = ((c & 0x1f) << 6);
2518 c |= (utf[upos++] & 0x3f);
2519 wcs[wpos++] = c;
2520 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2521 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2522 (utf[upos] & 0xc0) == 0x80 &&
2523 (utf[upos + 1] & 0xc0) == 0x80) {
2524 /* 3-byte utf-8 */
2525 c = ((c & 0x0f) << 12);
2526 c |= ((utf[upos++] & 0x3f) << 6);
2527 c |= (utf[upos++] & 0x3f);
2528 wcs[wpos++] = c;
2529 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2530 wpos + 1 < wcslen &&
2531 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2532 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2533 (utf[upos] & 0xc0) == 0x80 &&
2534 (utf[upos + 1] & 0xc0) == 0x80 &&
2535 (utf[upos + 2] & 0xc0) == 0x80) {
2536 /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2537 c = ((c & 0x07) << 18);
2538 c |= ((utf[upos++] & 0x3f) << 12);
2539 c |= ((utf[upos++] & 0x3f) << 6);
2540 c |= (utf[upos++] & 0x3f);
2541 c -= 0x10000;
2542 wcs[wpos++] = 0xd800 | (c >> 10);
2543 wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2544 } else if (c >= 0xa0) {
2545 /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2546 wcs[wpos++] = c;
2547 } else {
2548 /* invalid utf-8 byte, non-printable unicode: convert to hex */
2549 static const char *hex = "0123456789abcdef";
2550 wcs[wpos++] = hex[c >> 4];
2551 if (wpos < wcslen)
2552 wcs[wpos++] = hex[c & 0x0f];
2553 }
2554 }
2555 wcs[wpos] = 0;
2556 return wpos;
2557 }
2558
2559 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2560 {
2561 if (!wcs || !utf || utflen < 1) {
2562 errno = EINVAL;
2563 return -1;
2564 }
2565 utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2566 if (utflen)
2567 return utflen - 1;
2568 errno = ERANGE;
2569 return -1;
2570 }
2571
2572 static void setup_windows_environment(void)
2573 {
2574 char *tmp = getenv("TMPDIR");
2575
2576 /* on Windows it is TMP and TEMP */
2577 if (!tmp) {
2578 if (!(tmp = getenv("TMP")))
2579 tmp = getenv("TEMP");
2580 if (tmp) {
2581 setenv("TMPDIR", tmp, 1);
2582 tmp = getenv("TMPDIR");
2583 }
2584 }
2585
2586 if (tmp) {
2587 /*
2588 * Convert all dir separators to forward slashes,
2589 * to help shell commands called from the Git
2590 * executable (by not mistaking the dir separators
2591 * for escape characters).
2592 */
2593 convert_slashes(tmp);
2594 }
2595
2596 /* simulate TERM to enable auto-color (see color.c) */
2597 if (!getenv("TERM"))
2598 setenv("TERM", "cygwin", 1);
2599
2600 /* calculate HOME if not set */
2601 if (!getenv("HOME")) {
2602 /*
2603 * try $HOMEDRIVE$HOMEPATH - the home share may be a network
2604 * location, thus also check if the path exists (i.e. is not
2605 * disconnected)
2606 */
2607 if ((tmp = getenv("HOMEDRIVE"))) {
2608 struct strbuf buf = STRBUF_INIT;
2609 strbuf_addstr(&buf, tmp);
2610 if ((tmp = getenv("HOMEPATH"))) {
2611 strbuf_addstr(&buf, tmp);
2612 if (is_directory(buf.buf))
2613 setenv("HOME", buf.buf, 1);
2614 else
2615 tmp = NULL; /* use $USERPROFILE */
2616 }
2617 strbuf_release(&buf);
2618 }
2619 /* use $USERPROFILE if the home share is not available */
2620 if (!tmp && (tmp = getenv("USERPROFILE")))
2621 setenv("HOME", tmp, 1);
2622 }
2623 }
2624
2625 int is_valid_win32_path(const char *path, int allow_literal_nul)
2626 {
2627 const char *p = path;
2628 int preceding_space_or_period = 0, i = 0, periods = 0;
2629
2630 if (!protect_ntfs)
2631 return 1;
2632
2633 skip_dos_drive_prefix((char **)&path);
2634 goto segment_start;
2635
2636 for (;;) {
2637 char c = *(path++);
2638 switch (c) {
2639 case '\0':
2640 case '/': case '\\':
2641 /* cannot end in ` ` or `.`, except for `.` and `..` */
2642 if (preceding_space_or_period &&
2643 (i != periods || periods > 2))
2644 return 0;
2645 if (!c)
2646 return 1;
2647
2648 i = periods = preceding_space_or_period = 0;
2649
2650 segment_start:
2651 switch (*path) {
2652 case 'a': case 'A': /* AUX */
2653 if (((c = path[++i]) != 'u' && c != 'U') ||
2654 ((c = path[++i]) != 'x' && c != 'X')) {
2655 not_a_reserved_name:
2656 path += i;
2657 continue;
2658 }
2659 break;
2660 case 'c': case 'C':
2661 /* COM1 ... COM9, CON, CONIN$, CONOUT$ */
2662 if ((c = path[++i]) != 'o' && c != 'O')
2663 goto not_a_reserved_name;
2664 c = path[++i];
2665 if (c == 'm' || c == 'M') { /* COM1 ... COM9 */
2666 c = path[++i];
2667 if (c < '1' || c > '9')
2668 goto not_a_reserved_name;
2669 } else if (c == 'n' || c == 'N') { /* CON */
2670 c = path[i + 1];
2671 if ((c == 'i' || c == 'I') &&
2672 ((c = path[i + 2]) == 'n' ||
2673 c == 'N') &&
2674 path[i + 3] == '$')
2675 i += 3; /* CONIN$ */
2676 else if ((c == 'o' || c == 'O') &&
2677 ((c = path[i + 2]) == 'u' ||
2678 c == 'U') &&
2679 ((c = path[i + 3]) == 't' ||
2680 c == 'T') &&
2681 path[i + 4] == '$')
2682 i += 4; /* CONOUT$ */
2683 } else
2684 goto not_a_reserved_name;
2685 break;
2686 case 'l': case 'L': /* LPT<N> */
2687 if (((c = path[++i]) != 'p' && c != 'P') ||
2688 ((c = path[++i]) != 't' && c != 'T') ||
2689 !isdigit(path[++i]))
2690 goto not_a_reserved_name;
2691 break;
2692 case 'n': case 'N': /* NUL */
2693 if (((c = path[++i]) != 'u' && c != 'U') ||
2694 ((c = path[++i]) != 'l' && c != 'L') ||
2695 (allow_literal_nul &&
2696 !path[i + 1] && p == path))
2697 goto not_a_reserved_name;
2698 break;
2699 case 'p': case 'P': /* PRN */
2700 if (((c = path[++i]) != 'r' && c != 'R') ||
2701 ((c = path[++i]) != 'n' && c != 'N'))
2702 goto not_a_reserved_name;
2703 break;
2704 default:
2705 continue;
2706 }
2707
2708 /*
2709 * So far, this looks like a reserved name. Let's see
2710 * whether it actually is one: trailing spaces, a file
2711 * extension, or an NTFS Alternate Data Stream do not
2712 * matter, the name is still reserved if any of those
2713 * follow immediately after the actual name.
2714 */
2715 i++;
2716 if (path[i] == ' ') {
2717 preceding_space_or_period = 1;
2718 while (path[++i] == ' ')
2719 ; /* skip all spaces */
2720 }
2721
2722 c = path[i];
2723 if (c && c != '.' && c != ':' && c != '/' && c != '\\')
2724 goto not_a_reserved_name;
2725
2726 /* contains reserved name */
2727 return 0;
2728 case '.':
2729 periods++;
2730 /* fallthru */
2731 case ' ':
2732 preceding_space_or_period = 1;
2733 i++;
2734 continue;
2735 case ':': /* DOS drive prefix was already skipped */
2736 case '<': case '>': case '"': case '|': case '?': case '*':
2737 /* illegal character */
2738 return 0;
2739 default:
2740 if (c > '\0' && c < '\x20')
2741 /* illegal character */
2742 return 0;
2743 }
2744 preceding_space_or_period = 0;
2745 i++;
2746 }
2747 }
2748
2749 #if !defined(_MSC_VER)
2750 /*
2751 * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2752 * mingw startup code, see init.c in mingw runtime).
2753 */
2754 int _CRT_glob = 0;
2755 #endif
2756
2757 static NORETURN void die_startup(void)
2758 {
2759 fputs("fatal: not enough memory for initialization", stderr);
2760 exit(128);
2761 }
2762
2763 static void *malloc_startup(size_t size)
2764 {
2765 void *result = malloc(size);
2766 if (!result)
2767 die_startup();
2768 return result;
2769 }
2770
2771 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2772 {
2773 len = xwcstoutf(buffer, wcs, len) + 1;
2774 return memcpy(malloc_startup(len), buffer, len);
2775 }
2776
2777 static void maybe_redirect_std_handle(const wchar_t *key, DWORD std_id, int fd,
2778 DWORD desired_access, DWORD flags)
2779 {
2780 DWORD create_flag = fd ? OPEN_ALWAYS : OPEN_EXISTING;
2781 wchar_t buf[MAX_PATH];
2782 DWORD max = ARRAY_SIZE(buf);
2783 HANDLE handle;
2784 DWORD ret = GetEnvironmentVariableW(key, buf, max);
2785
2786 if (!ret || ret >= max)
2787 return;
2788
2789 /* make sure this does not leak into child processes */
2790 SetEnvironmentVariableW(key, NULL);
2791 if (!wcscmp(buf, L"off")) {
2792 close(fd);
2793 handle = GetStdHandle(std_id);
2794 if (handle != INVALID_HANDLE_VALUE)
2795 CloseHandle(handle);
2796 return;
2797 }
2798 if (std_id == STD_ERROR_HANDLE && !wcscmp(buf, L"2>&1")) {
2799 handle = GetStdHandle(STD_OUTPUT_HANDLE);
2800 if (handle == INVALID_HANDLE_VALUE) {
2801 close(fd);
2802 handle = GetStdHandle(std_id);
2803 if (handle != INVALID_HANDLE_VALUE)
2804 CloseHandle(handle);
2805 } else {
2806 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2807 SetStdHandle(std_id, handle);
2808 dup2(new_fd, fd);
2809 /* do *not* close the new_fd: that would close stdout */
2810 }
2811 return;
2812 }
2813 handle = CreateFileW(buf, desired_access, 0, NULL, create_flag,
2814 flags, NULL);
2815 if (handle != INVALID_HANDLE_VALUE) {
2816 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2817 SetStdHandle(std_id, handle);
2818 dup2(new_fd, fd);
2819 close(new_fd);
2820 }
2821 }
2822
2823 static void maybe_redirect_std_handles(void)
2824 {
2825 maybe_redirect_std_handle(L"GIT_REDIRECT_STDIN", STD_INPUT_HANDLE, 0,
2826 GENERIC_READ, FILE_ATTRIBUTE_NORMAL);
2827 maybe_redirect_std_handle(L"GIT_REDIRECT_STDOUT", STD_OUTPUT_HANDLE, 1,
2828 GENERIC_WRITE, FILE_ATTRIBUTE_NORMAL);
2829 maybe_redirect_std_handle(L"GIT_REDIRECT_STDERR", STD_ERROR_HANDLE, 2,
2830 GENERIC_WRITE, FILE_FLAG_NO_BUFFERING);
2831 }
2832
2833 #ifdef _MSC_VER
2834 #ifdef _DEBUG
2835 #include <crtdbg.h>
2836 #endif
2837 #endif
2838
2839 /*
2840 * We implement wmain() and compile with -municode, which would
2841 * normally ignore main(), but we call the latter from the former
2842 * so that we can handle non-ASCII command-line parameters
2843 * appropriately.
2844 *
2845 * To be more compatible with the core git code, we convert
2846 * argv into UTF8 and pass them directly to main().
2847 */
2848 int wmain(int argc, const wchar_t **wargv)
2849 {
2850 int i, maxlen, exit_status;
2851 char *buffer, **save;
2852 const char **argv;
2853
2854 trace2_initialize_clock();
2855
2856 #ifdef _MSC_VER
2857 #ifdef _DEBUG
2858 _CrtSetReportMode(_CRT_ASSERT, _CRTDBG_MODE_DEBUG);
2859 #endif
2860
2861 #ifdef USE_MSVC_CRTDBG
2862 _CrtSetDbgFlag(_CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF);
2863 #endif
2864 #endif
2865
2866 maybe_redirect_std_handles();
2867
2868 /* determine size of argv and environ conversion buffer */
2869 maxlen = wcslen(wargv[0]);
2870 for (i = 1; i < argc; i++)
2871 maxlen = max(maxlen, wcslen(wargv[i]));
2872
2873 /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2874 maxlen = 3 * maxlen + 1;
2875 buffer = malloc_startup(maxlen);
2876
2877 /*
2878 * Create a UTF-8 version of w_argv. Also create a "save" copy
2879 * to remember all the string pointers because parse_options()
2880 * will remove claimed items from the argv that we pass down.
2881 */
2882 ALLOC_ARRAY(argv, argc + 1);
2883 ALLOC_ARRAY(save, argc + 1);
2884 for (i = 0; i < argc; i++)
2885 argv[i] = save[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2886 argv[i] = save[i] = NULL;
2887 free(buffer);
2888
2889 /* fix Windows specific environment settings */
2890 setup_windows_environment();
2891
2892 unset_environment_variables = xstrdup("PERL5LIB");
2893
2894 /* initialize critical section for waitpid pinfo_t list */
2895 InitializeCriticalSection(&pinfo_cs);
2896
2897 /* set up default file mode and file modes for stdin/out/err */
2898 _fmode = _O_BINARY;
2899 _setmode(_fileno(stdin), _O_BINARY);
2900 _setmode(_fileno(stdout), _O_BINARY);
2901 _setmode(_fileno(stderr), _O_BINARY);
2902
2903 /* initialize Unicode console */
2904 winansi_init();
2905
2906 /* invoke the real main() using our utf8 version of argv. */
2907 exit_status = main(argc, argv);
2908
2909 for (i = 0; i < argc; i++)
2910 free(save[i]);
2911 free(save);
2912 free(argv);
2913
2914 return exit_status;
2915 }
2916
2917 int uname(struct utsname *buf)
2918 {
2919 unsigned v = (unsigned)GetVersion();
2920 memset(buf, 0, sizeof(*buf));
2921 xsnprintf(buf->sysname, sizeof(buf->sysname), "Windows");
2922 xsnprintf(buf->release, sizeof(buf->release),
2923 "%u.%u", v & 0xff, (v >> 8) & 0xff);
2924 /* assuming NT variants only.. */
2925 xsnprintf(buf->version, sizeof(buf->version),
2926 "%u", (v >> 16) & 0x7fff);
2927 return 0;
2928 }
git for Debian