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Merge branch 'jt/push-avoid-lazy-fetch'
[alt-git.git] / compat / mingw.c
blob6b765d936cfc8afe198b2735dafd4116c1706b58
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 int err_win_to_posix(DWORD winerr)
17 {
18 int error = ENOSYS;
19 switch(winerr) {
20 case ERROR_ACCESS_DENIED: error = EACCES; break;
21 case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
22 case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
23 case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
24 case ERROR_ALREADY_EXISTS: error = EEXIST; break;
25 case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
26 case ERROR_BAD_COMMAND: error = EIO; break;
27 case ERROR_BAD_DEVICE: error = ENODEV; break;
28 case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
29 case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
30 case ERROR_BAD_FORMAT: error = ENOEXEC; break;
31 case ERROR_BAD_LENGTH: error = EINVAL; break;
32 case ERROR_BAD_PATHNAME: error = ENOENT; break;
33 case ERROR_BAD_PIPE: error = EPIPE; break;
34 case ERROR_BAD_UNIT: error = ENODEV; break;
35 case ERROR_BAD_USERNAME: error = EINVAL; break;
36 case ERROR_BROKEN_PIPE: error = EPIPE; break;
37 case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
38 case ERROR_BUSY: error = EBUSY; break;
39 case ERROR_BUSY_DRIVE: error = EBUSY; break;
40 case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
41 case ERROR_CANNOT_MAKE: error = EACCES; break;
42 case ERROR_CANTOPEN: error = EIO; break;
43 case ERROR_CANTREAD: error = EIO; break;
44 case ERROR_CANTWRITE: error = EIO; break;
45 case ERROR_CRC: error = EIO; break;
46 case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
47 case ERROR_DEVICE_IN_USE: error = EBUSY; break;
48 case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
49 case ERROR_DIRECTORY: error = EINVAL; break;
50 case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
51 case ERROR_DISK_CHANGE: error = EIO; break;
52 case ERROR_DISK_FULL: error = ENOSPC; break;
53 case ERROR_DRIVE_LOCKED: error = EBUSY; break;
54 case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
55 case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
56 case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
57 case ERROR_FILE_EXISTS: error = EEXIST; break;
58 case ERROR_FILE_INVALID: error = ENODEV; break;
59 case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
60 case ERROR_GEN_FAILURE: error = EIO; break;
61 case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
62 case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
63 case ERROR_INVALID_ACCESS: error = EACCES; break;
64 case ERROR_INVALID_ADDRESS: error = EFAULT; break;
65 case ERROR_INVALID_BLOCK: error = EFAULT; break;
66 case ERROR_INVALID_DATA: error = EINVAL; break;
67 case ERROR_INVALID_DRIVE: error = ENODEV; break;
68 case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
69 case ERROR_INVALID_FLAGS: error = EINVAL; break;
70 case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
71 case ERROR_INVALID_HANDLE: error = EBADF; break;
72 case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
73 case ERROR_INVALID_NAME: error = EINVAL; break;
74 case ERROR_INVALID_OWNER: error = EINVAL; break;
75 case ERROR_INVALID_PARAMETER: error = EINVAL; break;
76 case ERROR_INVALID_PASSWORD: error = EPERM; break;
77 case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
78 case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
79 case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
80 case ERROR_INVALID_WORKSTATION: error = EACCES; break;
81 case ERROR_IO_DEVICE: error = EIO; break;
82 case ERROR_IO_INCOMPLETE: error = EINTR; break;
83 case ERROR_LOCKED: error = EBUSY; break;
84 case ERROR_LOCK_VIOLATION: error = EACCES; break;
85 case ERROR_LOGON_FAILURE: error = EACCES; break;
86 case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
87 case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
88 case ERROR_MORE_DATA: error = EPIPE; break;
89 case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
90 case ERROR_NOACCESS: error = EFAULT; break;
91 case ERROR_NONE_MAPPED: error = EINVAL; break;
92 case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
93 case ERROR_NOT_READY: error = EAGAIN; break;
94 case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
95 case ERROR_NO_DATA: error = EPIPE; break;
96 case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
97 case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
98 case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
99 case ERROR_OPEN_FAILED: error = EIO; break;
100 case ERROR_OPEN_FILES: error = EBUSY; break;
101 case ERROR_OPERATION_ABORTED: error = EINTR; break;
102 case ERROR_OUTOFMEMORY: error = ENOMEM; break;
103 case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
104 case ERROR_PATH_BUSY: error = EBUSY; break;
105 case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
106 case ERROR_PIPE_BUSY: error = EBUSY; break;
107 case ERROR_PIPE_CONNECTED: error = EPIPE; break;
108 case ERROR_PIPE_LISTENING: error = EPIPE; break;
109 case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
110 case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
111 case ERROR_READ_FAULT: error = EIO; break;
112 case ERROR_SEEK: error = EIO; break;
113 case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
114 case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
115 case ERROR_SHARING_VIOLATION: error = EACCES; break;
116 case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
117 case ERROR_SWAPERROR: error = ENOENT; break;
118 case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
119 case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
120 case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
121 case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
122 case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
123 case ERROR_WRITE_FAULT: error = EIO; break;
124 case ERROR_WRITE_PROTECT: error = EROFS; break;
125 }
126 return error;
127 }
128
129 static inline int is_file_in_use_error(DWORD errcode)
130 {
131 switch (errcode) {
132 case ERROR_SHARING_VIOLATION:
133 case ERROR_ACCESS_DENIED:
134 return 1;
135 }
136
137 return 0;
138 }
139
140 static int read_yes_no_answer(void)
141 {
142 char answer[1024];
143
144 if (fgets(answer, sizeof(answer), stdin)) {
145 size_t answer_len = strlen(answer);
146 int got_full_line = 0, c;
147
148 /* remove the newline */
149 if (answer_len >= 2 && answer[answer_len-2] == '\r') {
150 answer[answer_len-2] = '\0';
151 got_full_line = 1;
152 } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
153 answer[answer_len-1] = '\0';
154 got_full_line = 1;
155 }
156 /* flush the buffer in case we did not get the full line */
157 if (!got_full_line)
158 while ((c = getchar()) != EOF && c != '\n')
159 ;
160 } else
161 /* we could not read, return the
162 * default answer which is no */
163 return 0;
164
165 if (tolower(answer[0]) == 'y' && !answer[1])
166 return 1;
167 if (!strncasecmp(answer, "yes", sizeof(answer)))
168 return 1;
169 if (tolower(answer[0]) == 'n' && !answer[1])
170 return 0;
171 if (!strncasecmp(answer, "no", sizeof(answer)))
172 return 0;
173
174 /* did not find an answer we understand */
175 return -1;
176 }
177
178 static int ask_yes_no_if_possible(const char *format, ...)
179 {
180 char question[4096];
181 const char *retry_hook[] = { NULL, NULL, NULL };
182 va_list args;
183
184 va_start(args, format);
185 vsnprintf(question, sizeof(question), format, args);
186 va_end(args);
187
188 if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) {
189 retry_hook[1] = question;
190 return !run_command_v_opt(retry_hook, 0);
191 }
192
193 if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
194 return 0;
195
196 while (1) {
197 int answer;
198 fprintf(stderr, "%s (y/n) ", question);
199
200 if ((answer = read_yes_no_answer()) >= 0)
201 return answer;
202
203 fprintf(stderr, "Sorry, I did not understand your answer. "
204 "Please type 'y' or 'n'\n");
205 }
206 }
207
208 /* Windows only */
209 enum hide_dotfiles_type {
210 HIDE_DOTFILES_FALSE = 0,
211 HIDE_DOTFILES_TRUE,
212 HIDE_DOTFILES_DOTGITONLY
213 };
214
215 static enum hide_dotfiles_type hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
216 static char *unset_environment_variables;
217
218 int mingw_core_config(const char *var, const char *value, void *cb)
219 {
220 if (!strcmp(var, "core.hidedotfiles")) {
221 if (value && !strcasecmp(value, "dotgitonly"))
222 hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
223 else
224 hide_dotfiles = git_config_bool(var, value);
225 return 0;
226 }
227
228 if (!strcmp(var, "core.unsetenvvars")) {
229 free(unset_environment_variables);
230 unset_environment_variables = xstrdup(value);
231 return 0;
232 }
233
234 return 0;
235 }
236
237 /* Normalizes NT paths as returned by some low-level APIs. */
238 static wchar_t *normalize_ntpath(wchar_t *wbuf)
239 {
240 int i;
241 /* fix absolute path prefixes */
242 if (wbuf[0] == '\\') {
243 /* strip NT namespace prefixes */
244 if (!wcsncmp(wbuf, L"\\??\\", 4) ||
245 !wcsncmp(wbuf, L"\\\\?\\", 4))
246 wbuf += 4;
247 else if (!wcsnicmp(wbuf, L"\\DosDevices\\", 12))
248 wbuf += 12;
249 /* replace remaining '...UNC\' with '\\' */
250 if (!wcsnicmp(wbuf, L"UNC\\", 4)) {
251 wbuf += 2;
252 *wbuf = '\\';
253 }
254 }
255 /* convert backslashes to slashes */
256 for (i = 0; wbuf[i]; i++)
257 if (wbuf[i] == '\\')
258 wbuf[i] = '/';
259 return wbuf;
260 }
261
262 int mingw_unlink(const char *pathname)
263 {
264 int ret, tries = 0;
265 wchar_t wpathname[MAX_PATH];
266 if (xutftowcs_path(wpathname, pathname) < 0)
267 return -1;
268
269 /* read-only files cannot be removed */
270 _wchmod(wpathname, 0666);
271 while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
272 if (!is_file_in_use_error(GetLastError()))
273 break;
274 /*
275 * We assume that some other process had the source or
276 * destination file open at the wrong moment and retry.
277 * In order to give the other process a higher chance to
278 * complete its operation, we give up our time slice now.
279 * If we have to retry again, we do sleep a bit.
280 */
281 Sleep(delay[tries]);
282 tries++;
283 }
284 while (ret == -1 && is_file_in_use_error(GetLastError()) &&
285 ask_yes_no_if_possible("Unlink of file '%s' failed. "
286 "Should I try again?", pathname))
287 ret = _wunlink(wpathname);
288 return ret;
289 }
290
291 static int is_dir_empty(const wchar_t *wpath)
292 {
293 WIN32_FIND_DATAW findbuf;
294 HANDLE handle;
295 wchar_t wbuf[MAX_PATH + 2];
296 wcscpy(wbuf, wpath);
297 wcscat(wbuf, L"\\*");
298 handle = FindFirstFileW(wbuf, &findbuf);
299 if (handle == INVALID_HANDLE_VALUE)
300 return GetLastError() == ERROR_NO_MORE_FILES;
301
302 while (!wcscmp(findbuf.cFileName, L".") ||
303 !wcscmp(findbuf.cFileName, L".."))
304 if (!FindNextFileW(handle, &findbuf)) {
305 DWORD err = GetLastError();
306 FindClose(handle);
307 return err == ERROR_NO_MORE_FILES;
308 }
309 FindClose(handle);
310 return 0;
311 }
312
313 int mingw_rmdir(const char *pathname)
314 {
315 int ret, tries = 0;
316 wchar_t wpathname[MAX_PATH];
317 if (xutftowcs_path(wpathname, pathname) < 0)
318 return -1;
319
320 while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
321 if (!is_file_in_use_error(GetLastError()))
322 errno = err_win_to_posix(GetLastError());
323 if (errno != EACCES)
324 break;
325 if (!is_dir_empty(wpathname)) {
326 errno = ENOTEMPTY;
327 break;
328 }
329 /*
330 * We assume that some other process had the source or
331 * destination file open at the wrong moment and retry.
332 * In order to give the other process a higher chance to
333 * complete its operation, we give up our time slice now.
334 * If we have to retry again, we do sleep a bit.
335 */
336 Sleep(delay[tries]);
337 tries++;
338 }
339 while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
340 ask_yes_no_if_possible("Deletion of directory '%s' failed. "
341 "Should I try again?", pathname))
342 ret = _wrmdir(wpathname);
343 return ret;
344 }
345
346 static inline int needs_hiding(const char *path)
347 {
348 const char *basename;
349
350 if (hide_dotfiles == HIDE_DOTFILES_FALSE)
351 return 0;
352
353 /* We cannot use basename(), as it would remove trailing slashes */
354 win32_skip_dos_drive_prefix((char **)&path);
355 if (!*path)
356 return 0;
357
358 for (basename = path; *path; path++)
359 if (is_dir_sep(*path)) {
360 do {
361 path++;
362 } while (is_dir_sep(*path));
363 /* ignore trailing slashes */
364 if (*path)
365 basename = path;
366 }
367
368 if (hide_dotfiles == HIDE_DOTFILES_TRUE)
369 return *basename == '.';
370
371 assert(hide_dotfiles == HIDE_DOTFILES_DOTGITONLY);
372 return !strncasecmp(".git", basename, 4) &&
373 (!basename[4] || is_dir_sep(basename[4]));
374 }
375
376 static int set_hidden_flag(const wchar_t *path, int set)
377 {
378 DWORD original = GetFileAttributesW(path), modified;
379 if (set)
380 modified = original | FILE_ATTRIBUTE_HIDDEN;
381 else
382 modified = original & ~FILE_ATTRIBUTE_HIDDEN;
383 if (original == modified || SetFileAttributesW(path, modified))
384 return 0;
385 errno = err_win_to_posix(GetLastError());
386 return -1;
387 }
388
389 int mingw_mkdir(const char *path, int mode)
390 {
391 int ret;
392 wchar_t wpath[MAX_PATH];
393 if (xutftowcs_path(wpath, path) < 0)
394 return -1;
395 ret = _wmkdir(wpath);
396 if (!ret && needs_hiding(path))
397 return set_hidden_flag(wpath, 1);
398 return ret;
399 }
400
401 /*
402 * Calling CreateFile() using FILE_APPEND_DATA and without FILE_WRITE_DATA
403 * is documented in [1] as opening a writable file handle in append mode.
404 * (It is believed that) this is atomic since it is maintained by the
405 * kernel unlike the O_APPEND flag which is racily maintained by the CRT.
406 *
407 * [1] https://docs.microsoft.com/en-us/windows/desktop/fileio/file-access-rights-constants
408 *
409 * This trick does not appear to work for named pipes. Instead it creates
410 * a named pipe client handle that cannot be written to. Callers should
411 * just use the regular _wopen() for them. (And since client handle gets
412 * bound to a unique server handle, it isn't really an issue.)
413 */
414 static int mingw_open_append(wchar_t const *wfilename, int oflags, ...)
415 {
416 HANDLE handle;
417 int fd;
418 DWORD create = (oflags & O_CREAT) ? OPEN_ALWAYS : OPEN_EXISTING;
419
420 /* only these flags are supported */
421 if ((oflags & ~O_CREAT) != (O_WRONLY | O_APPEND))
422 return errno = ENOSYS, -1;
423
424 /*
425 * FILE_SHARE_WRITE is required to permit child processes
426 * to append to the file.
427 */
428 handle = CreateFileW(wfilename, FILE_APPEND_DATA,
429 FILE_SHARE_WRITE | FILE_SHARE_READ,
430 NULL, create, FILE_ATTRIBUTE_NORMAL, NULL);
431 if (handle == INVALID_HANDLE_VALUE)
432 return errno = err_win_to_posix(GetLastError()), -1;
433
434 /*
435 * No O_APPEND here, because the CRT uses it only to reset the
436 * file pointer to EOF before each write(); but that is not
437 * necessary (and may lead to races) for a file created with
438 * FILE_APPEND_DATA.
439 */
440 fd = _open_osfhandle((intptr_t)handle, O_BINARY);
441 if (fd < 0)
442 CloseHandle(handle);
443 return fd;
444 }
445
446 /*
447 * Does the pathname map to the local named pipe filesystem?
448 * That is, does it have a "//./pipe/" prefix?
449 */
450 static int is_local_named_pipe_path(const char *filename)
451 {
452 return (is_dir_sep(filename[0]) &&
453 is_dir_sep(filename[1]) &&
454 filename[2] == '.' &&
455 is_dir_sep(filename[3]) &&
456 !strncasecmp(filename+4, "pipe", 4) &&
457 is_dir_sep(filename[8]) &&
458 filename[9]);
459 }
460
461 int mingw_open (const char *filename, int oflags, ...)
462 {
463 typedef int (*open_fn_t)(wchar_t const *wfilename, int oflags, ...);
464 va_list args;
465 unsigned mode;
466 int fd;
467 wchar_t wfilename[MAX_PATH];
468 open_fn_t open_fn;
469
470 va_start(args, oflags);
471 mode = va_arg(args, int);
472 va_end(args);
473
474 if (filename && !strcmp(filename, "/dev/null"))
475 filename = "nul";
476
477 if ((oflags & O_APPEND) && !is_local_named_pipe_path(filename))
478 open_fn = mingw_open_append;
479 else
480 open_fn = _wopen;
481
482 if (xutftowcs_path(wfilename, filename) < 0)
483 return -1;
484 fd = open_fn(wfilename, oflags, mode);
485
486 if (fd < 0 && (oflags & O_ACCMODE) != O_RDONLY && errno == EACCES) {
487 DWORD attrs = GetFileAttributesW(wfilename);
488 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
489 errno = EISDIR;
490 }
491 if ((oflags & O_CREAT) && needs_hiding(filename)) {
492 /*
493 * Internally, _wopen() uses the CreateFile() API which errors
494 * out with an ERROR_ACCESS_DENIED if CREATE_ALWAYS was
495 * specified and an already existing file's attributes do not
496 * match *exactly*. As there is no mode or flag we can set that
497 * would correspond to FILE_ATTRIBUTE_HIDDEN, let's just try
498 * again *without* the O_CREAT flag (that corresponds to the
499 * CREATE_ALWAYS flag of CreateFile()).
500 */
501 if (fd < 0 && errno == EACCES)
502 fd = open_fn(wfilename, oflags & ~O_CREAT, mode);
503 if (fd >= 0 && set_hidden_flag(wfilename, 1))
504 warning("could not mark '%s' as hidden.", filename);
505 }
506 return fd;
507 }
508
509 static BOOL WINAPI ctrl_ignore(DWORD type)
510 {
511 return TRUE;
512 }
513
514 #undef fgetc
515 int mingw_fgetc(FILE *stream)
516 {
517 int ch;
518 if (!isatty(_fileno(stream)))
519 return fgetc(stream);
520
521 SetConsoleCtrlHandler(ctrl_ignore, TRUE);
522 while (1) {
523 ch = fgetc(stream);
524 if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
525 break;
526
527 /* Ctrl+C was pressed, simulate SIGINT and retry */
528 mingw_raise(SIGINT);
529 }
530 SetConsoleCtrlHandler(ctrl_ignore, FALSE);
531 return ch;
532 }
533
534 #undef fopen
535 FILE *mingw_fopen (const char *filename, const char *otype)
536 {
537 int hide = needs_hiding(filename);
538 FILE *file;
539 wchar_t wfilename[MAX_PATH], wotype[4];
540 if (filename && !strcmp(filename, "/dev/null"))
541 filename = "nul";
542 if (xutftowcs_path(wfilename, filename) < 0 ||
543 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
544 return NULL;
545 if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
546 error("could not unhide %s", filename);
547 return NULL;
548 }
549 file = _wfopen(wfilename, wotype);
550 if (!file && GetLastError() == ERROR_INVALID_NAME)
551 errno = ENOENT;
552 if (file && hide && set_hidden_flag(wfilename, 1))
553 warning("could not mark '%s' as hidden.", filename);
554 return file;
555 }
556
557 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
558 {
559 int hide = needs_hiding(filename);
560 FILE *file;
561 wchar_t wfilename[MAX_PATH], wotype[4];
562 if (filename && !strcmp(filename, "/dev/null"))
563 filename = "nul";
564 if (xutftowcs_path(wfilename, filename) < 0 ||
565 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
566 return NULL;
567 if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
568 error("could not unhide %s", filename);
569 return NULL;
570 }
571 file = _wfreopen(wfilename, wotype, stream);
572 if (file && hide && set_hidden_flag(wfilename, 1))
573 warning("could not mark '%s' as hidden.", filename);
574 return file;
575 }
576
577 #undef fflush
578 int mingw_fflush(FILE *stream)
579 {
580 int ret = fflush(stream);
581
582 /*
583 * write() is used behind the scenes of stdio output functions.
584 * Since git code does not check for errors after each stdio write
585 * operation, it can happen that write() is called by a later
586 * stdio function even if an earlier write() call failed. In the
587 * case of a pipe whose readable end was closed, only the first
588 * call to write() reports EPIPE on Windows. Subsequent write()
589 * calls report EINVAL. It is impossible to notice whether this
590 * fflush invocation triggered such a case, therefore, we have to
591 * catch all EINVAL errors whole-sale.
592 */
593 if (ret && errno == EINVAL)
594 errno = EPIPE;
595
596 return ret;
597 }
598
599 #undef write
600 ssize_t mingw_write(int fd, const void *buf, size_t len)
601 {
602 ssize_t result = write(fd, buf, len);
603
604 if (result < 0 && errno == EINVAL && buf) {
605 /* check if fd is a pipe */
606 HANDLE h = (HANDLE) _get_osfhandle(fd);
607 if (GetFileType(h) == FILE_TYPE_PIPE)
608 errno = EPIPE;
609 else
610 errno = EINVAL;
611 }
612
613 return result;
614 }
615
616 int mingw_access(const char *filename, int mode)
617 {
618 wchar_t wfilename[MAX_PATH];
619 if (xutftowcs_path(wfilename, filename) < 0)
620 return -1;
621 /* X_OK is not supported by the MSVCRT version */
622 return _waccess(wfilename, mode & ~X_OK);
623 }
624
625 int mingw_chdir(const char *dirname)
626 {
627 wchar_t wdirname[MAX_PATH];
628 if (xutftowcs_path(wdirname, dirname) < 0)
629 return -1;
630 return _wchdir(wdirname);
631 }
632
633 int mingw_chmod(const char *filename, int mode)
634 {
635 wchar_t wfilename[MAX_PATH];
636 if (xutftowcs_path(wfilename, filename) < 0)
637 return -1;
638 return _wchmod(wfilename, mode);
639 }
640
641 /*
642 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
643 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
644 */
645 static inline long long filetime_to_hnsec(const FILETIME *ft)
646 {
647 long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
648 /* Windows to Unix Epoch conversion */
649 return winTime - 116444736000000000LL;
650 }
651
652 static inline void filetime_to_timespec(const FILETIME *ft, struct timespec *ts)
653 {
654 long long hnsec = filetime_to_hnsec(ft);
655 ts->tv_sec = (time_t)(hnsec / 10000000);
656 ts->tv_nsec = (hnsec % 10000000) * 100;
657 }
658
659 /**
660 * Verifies that safe_create_leading_directories() would succeed.
661 */
662 static int has_valid_directory_prefix(wchar_t *wfilename)
663 {
664 int n = wcslen(wfilename);
665
666 while (n > 0) {
667 wchar_t c = wfilename[--n];
668 DWORD attributes;
669
670 if (!is_dir_sep(c))
671 continue;
672
673 wfilename[n] = L'\0';
674 attributes = GetFileAttributesW(wfilename);
675 wfilename[n] = c;
676 if (attributes == FILE_ATTRIBUTE_DIRECTORY ||
677 attributes == FILE_ATTRIBUTE_DEVICE)
678 return 1;
679 if (attributes == INVALID_FILE_ATTRIBUTES)
680 switch (GetLastError()) {
681 case ERROR_PATH_NOT_FOUND:
682 continue;
683 case ERROR_FILE_NOT_FOUND:
684 /* This implies parent directory exists. */
685 return 1;
686 }
687 return 0;
688 }
689 return 1;
690 }
691
692 /* We keep the do_lstat code in a separate function to avoid recursion.
693 * When a path ends with a slash, the stat will fail with ENOENT. In
694 * this case, we strip the trailing slashes and stat again.
695 *
696 * If follow is true then act like stat() and report on the link
697 * target. Otherwise report on the link itself.
698 */
699 static int do_lstat(int follow, const char *file_name, struct stat *buf)
700 {
701 WIN32_FILE_ATTRIBUTE_DATA fdata;
702 wchar_t wfilename[MAX_PATH];
703 if (xutftowcs_path(wfilename, file_name) < 0)
704 return -1;
705
706 if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
707 buf->st_ino = 0;
708 buf->st_gid = 0;
709 buf->st_uid = 0;
710 buf->st_nlink = 1;
711 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
712 buf->st_size = fdata.nFileSizeLow |
713 (((off_t)fdata.nFileSizeHigh)<<32);
714 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
715 filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim));
716 filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim));
717 filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim));
718 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
719 WIN32_FIND_DATAW findbuf;
720 HANDLE handle = FindFirstFileW(wfilename, &findbuf);
721 if (handle != INVALID_HANDLE_VALUE) {
722 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
723 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
724 if (follow) {
725 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
726 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
727 } else {
728 buf->st_mode = S_IFLNK;
729 }
730 buf->st_mode |= S_IREAD;
731 if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
732 buf->st_mode |= S_IWRITE;
733 }
734 FindClose(handle);
735 }
736 }
737 return 0;
738 }
739 switch (GetLastError()) {
740 case ERROR_ACCESS_DENIED:
741 case ERROR_SHARING_VIOLATION:
742 case ERROR_LOCK_VIOLATION:
743 case ERROR_SHARING_BUFFER_EXCEEDED:
744 errno = EACCES;
745 break;
746 case ERROR_BUFFER_OVERFLOW:
747 errno = ENAMETOOLONG;
748 break;
749 case ERROR_NOT_ENOUGH_MEMORY:
750 errno = ENOMEM;
751 break;
752 case ERROR_PATH_NOT_FOUND:
753 if (!has_valid_directory_prefix(wfilename)) {
754 errno = ENOTDIR;
755 break;
756 }
757 /* fallthru */
758 default:
759 errno = ENOENT;
760 break;
761 }
762 return -1;
763 }
764
765 /* We provide our own lstat/fstat functions, since the provided
766 * lstat/fstat functions are so slow. These stat functions are
767 * tailored for Git's usage (read: fast), and are not meant to be
768 * complete. Note that Git stat()s are redirected to mingw_lstat()
769 * too, since Windows doesn't really handle symlinks that well.
770 */
771 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
772 {
773 int namelen;
774 char alt_name[PATH_MAX];
775
776 if (!do_lstat(follow, file_name, buf))
777 return 0;
778
779 /* if file_name ended in a '/', Windows returned ENOENT;
780 * try again without trailing slashes
781 */
782 if (errno != ENOENT)
783 return -1;
784
785 namelen = strlen(file_name);
786 if (namelen && file_name[namelen-1] != '/')
787 return -1;
788 while (namelen && file_name[namelen-1] == '/')
789 --namelen;
790 if (!namelen || namelen >= PATH_MAX)
791 return -1;
792
793 memcpy(alt_name, file_name, namelen);
794 alt_name[namelen] = 0;
795 return do_lstat(follow, alt_name, buf);
796 }
797
798 static int get_file_info_by_handle(HANDLE hnd, struct stat *buf)
799 {
800 BY_HANDLE_FILE_INFORMATION fdata;
801
802 if (!GetFileInformationByHandle(hnd, &fdata)) {
803 errno = err_win_to_posix(GetLastError());
804 return -1;
805 }
806
807 buf->st_ino = 0;
808 buf->st_gid = 0;
809 buf->st_uid = 0;
810 buf->st_nlink = 1;
811 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
812 buf->st_size = fdata.nFileSizeLow |
813 (((off_t)fdata.nFileSizeHigh)<<32);
814 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
815 filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim));
816 filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim));
817 filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim));
818 return 0;
819 }
820
821 int mingw_lstat(const char *file_name, struct stat *buf)
822 {
823 return do_stat_internal(0, file_name, buf);
824 }
825 int mingw_stat(const char *file_name, struct stat *buf)
826 {
827 return do_stat_internal(1, file_name, buf);
828 }
829
830 int mingw_fstat(int fd, struct stat *buf)
831 {
832 HANDLE fh = (HANDLE)_get_osfhandle(fd);
833 DWORD avail, type = GetFileType(fh) & ~FILE_TYPE_REMOTE;
834
835 switch (type) {
836 case FILE_TYPE_DISK:
837 return get_file_info_by_handle(fh, buf);
838
839 case FILE_TYPE_CHAR:
840 case FILE_TYPE_PIPE:
841 /* initialize stat fields */
842 memset(buf, 0, sizeof(*buf));
843 buf->st_nlink = 1;
844
845 if (type == FILE_TYPE_CHAR) {
846 buf->st_mode = _S_IFCHR;
847 } else {
848 buf->st_mode = _S_IFIFO;
849 if (PeekNamedPipe(fh, NULL, 0, NULL, &avail, NULL))
850 buf->st_size = avail;
851 }
852 return 0;
853
854 default:
855 errno = EBADF;
856 return -1;
857 }
858 }
859
860 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
861 {
862 long long winTime = t * 10000000LL + 116444736000000000LL;
863 ft->dwLowDateTime = winTime;
864 ft->dwHighDateTime = winTime >> 32;
865 }
866
867 int mingw_utime (const char *file_name, const struct utimbuf *times)
868 {
869 FILETIME mft, aft;
870 int fh, rc;
871 DWORD attrs;
872 wchar_t wfilename[MAX_PATH];
873 if (xutftowcs_path(wfilename, file_name) < 0)
874 return -1;
875
876 /* must have write permission */
877 attrs = GetFileAttributesW(wfilename);
878 if (attrs != INVALID_FILE_ATTRIBUTES &&
879 (attrs & FILE_ATTRIBUTE_READONLY)) {
880 /* ignore errors here; open() will report them */
881 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
882 }
883
884 if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
885 rc = -1;
886 goto revert_attrs;
887 }
888
889 if (times) {
890 time_t_to_filetime(times->modtime, &mft);
891 time_t_to_filetime(times->actime, &aft);
892 } else {
893 GetSystemTimeAsFileTime(&mft);
894 aft = mft;
895 }
896 if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
897 errno = EINVAL;
898 rc = -1;
899 } else
900 rc = 0;
901 close(fh);
902
903 revert_attrs:
904 if (attrs != INVALID_FILE_ATTRIBUTES &&
905 (attrs & FILE_ATTRIBUTE_READONLY)) {
906 /* ignore errors again */
907 SetFileAttributesW(wfilename, attrs);
908 }
909 return rc;
910 }
911
912 #undef strftime
913 size_t mingw_strftime(char *s, size_t max,
914 const char *format, const struct tm *tm)
915 {
916 size_t ret = strftime(s, max, format, tm);
917
918 if (!ret && errno == EINVAL)
919 die("invalid strftime format: '%s'", format);
920 return ret;
921 }
922
923 unsigned int sleep (unsigned int seconds)
924 {
925 Sleep(seconds*1000);
926 return 0;
927 }
928
929 char *mingw_mktemp(char *template)
930 {
931 wchar_t wtemplate[MAX_PATH];
932 if (xutftowcs_path(wtemplate, template) < 0)
933 return NULL;
934 if (!_wmktemp(wtemplate))
935 return NULL;
936 if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
937 return NULL;
938 return template;
939 }
940
941 int mkstemp(char *template)
942 {
943 char *filename = mktemp(template);
944 if (filename == NULL)
945 return -1;
946 return open(filename, O_RDWR | O_CREAT, 0600);
947 }
948
949 int gettimeofday(struct timeval *tv, void *tz)
950 {
951 FILETIME ft;
952 long long hnsec;
953
954 GetSystemTimeAsFileTime(&ft);
955 hnsec = filetime_to_hnsec(&ft);
956 tv->tv_sec = hnsec / 10000000;
957 tv->tv_usec = (hnsec % 10000000) / 10;
958 return 0;
959 }
960
961 int pipe(int filedes[2])
962 {
963 HANDLE h[2];
964
965 /* this creates non-inheritable handles */
966 if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
967 errno = err_win_to_posix(GetLastError());
968 return -1;
969 }
970 filedes[0] = _open_osfhandle(HCAST(int, h[0]), O_NOINHERIT);
971 if (filedes[0] < 0) {
972 CloseHandle(h[0]);
973 CloseHandle(h[1]);
974 return -1;
975 }
976 filedes[1] = _open_osfhandle(HCAST(int, h[1]), O_NOINHERIT);
977 if (filedes[1] < 0) {
978 close(filedes[0]);
979 CloseHandle(h[1]);
980 return -1;
981 }
982 return 0;
983 }
984
985 struct tm *gmtime_r(const time_t *timep, struct tm *result)
986 {
987 /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
988 memcpy(result, gmtime(timep), sizeof(struct tm));
989 return result;
990 }
991
992 struct tm *localtime_r(const time_t *timep, struct tm *result)
993 {
994 /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
995 memcpy(result, localtime(timep), sizeof(struct tm));
996 return result;
997 }
998
999 char *mingw_getcwd(char *pointer, int len)
1000 {
1001 wchar_t cwd[MAX_PATH], wpointer[MAX_PATH];
1002 DWORD ret = GetCurrentDirectoryW(ARRAY_SIZE(cwd), cwd);
1003
1004 if (!ret || ret >= ARRAY_SIZE(cwd)) {
1005 errno = ret ? ENAMETOOLONG : err_win_to_posix(GetLastError());
1006 return NULL;
1007 }
1008 ret = GetLongPathNameW(cwd, wpointer, ARRAY_SIZE(wpointer));
1009 if (!ret && GetLastError() == ERROR_ACCESS_DENIED) {
1010 HANDLE hnd = CreateFileW(cwd, 0,
1011 FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL,
1012 OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
1013 if (hnd == INVALID_HANDLE_VALUE)
1014 return NULL;
1015 ret = GetFinalPathNameByHandleW(hnd, wpointer, ARRAY_SIZE(wpointer), 0);
1016 CloseHandle(hnd);
1017 if (!ret || ret >= ARRAY_SIZE(wpointer))
1018 return NULL;
1019 if (xwcstoutf(pointer, normalize_ntpath(wpointer), len) < 0)
1020 return NULL;
1021 return pointer;
1022 }
1023 if (!ret || ret >= ARRAY_SIZE(wpointer))
1024 return NULL;
1025 if (xwcstoutf(pointer, wpointer, len) < 0)
1026 return NULL;
1027 convert_slashes(pointer);
1028 return pointer;
1029 }
1030
1031 /*
1032 * See "Parsing C++ Command-Line Arguments" at Microsoft's Docs:
1033 * https://docs.microsoft.com/en-us/cpp/cpp/parsing-cpp-command-line-arguments
1034 */
1035 static const char *quote_arg_msvc(const char *arg)
1036 {
1037 /* count chars to quote */
1038 int len = 0, n = 0;
1039 int force_quotes = 0;
1040 char *q, *d;
1041 const char *p = arg;
1042 if (!*p) force_quotes = 1;
1043 while (*p) {
1044 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
1045 force_quotes = 1;
1046 else if (*p == '"')
1047 n++;
1048 else if (*p == '\\') {
1049 int count = 0;
1050 while (*p == '\\') {
1051 count++;
1052 p++;
1053 len++;
1054 }
1055 if (*p == '"')
1056 n += count*2 + 1;
1057 continue;
1058 }
1059 len++;
1060 p++;
1061 }
1062 if (!force_quotes && n == 0)
1063 return arg;
1064
1065 /* insert \ where necessary */
1066 d = q = xmalloc(st_add3(len, n, 3));
1067 *d++ = '"';
1068 while (*arg) {
1069 if (*arg == '"')
1070 *d++ = '\\';
1071 else if (*arg == '\\') {
1072 int count = 0;
1073 while (*arg == '\\') {
1074 count++;
1075 *d++ = *arg++;
1076 }
1077 if (*arg == '"') {
1078 while (count-- > 0)
1079 *d++ = '\\';
1080 *d++ = '\\';
1081 }
1082 }
1083 *d++ = *arg++;
1084 }
1085 *d++ = '"';
1086 *d++ = 0;
1087 return q;
1088 }
1089
1090 #include "quote.h"
1091
1092 static const char *quote_arg_msys2(const char *arg)
1093 {
1094 struct strbuf buf = STRBUF_INIT;
1095 const char *p2 = arg, *p;
1096
1097 for (p = arg; *p; p++) {
1098 int ws = isspace(*p);
1099 if (!ws && *p != '\\' && *p != '"' && *p != '{')
1100 continue;
1101 if (!buf.len)
1102 strbuf_addch(&buf, '"');
1103 if (p != p2)
1104 strbuf_add(&buf, p2, p - p2);
1105 if (!ws && *p != '{')
1106 strbuf_addch(&buf, '\\');
1107 p2 = p;
1108 }
1109
1110 if (p == arg)
1111 strbuf_addch(&buf, '"');
1112 else if (!buf.len)
1113 return arg;
1114 else
1115 strbuf_add(&buf, p2, p - p2),
1116
1117 strbuf_addch(&buf, '"');
1118 return strbuf_detach(&buf, 0);
1119 }
1120
1121 static const char *parse_interpreter(const char *cmd)
1122 {
1123 static char buf[100];
1124 char *p, *opt;
1125 int n, fd;
1126
1127 /* don't even try a .exe */
1128 n = strlen(cmd);
1129 if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
1130 return NULL;
1131
1132 fd = open(cmd, O_RDONLY);
1133 if (fd < 0)
1134 return NULL;
1135 n = read(fd, buf, sizeof(buf)-1);
1136 close(fd);
1137 if (n < 4) /* at least '#!/x' and not error */
1138 return NULL;
1139
1140 if (buf[0] != '#' || buf[1] != '!')
1141 return NULL;
1142 buf[n] = '\0';
1143 p = buf + strcspn(buf, "\r\n");
1144 if (!*p)
1145 return NULL;
1146
1147 *p = '\0';
1148 if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
1149 return NULL;
1150 /* strip options */
1151 if ((opt = strchr(p+1, ' ')))
1152 *opt = '\0';
1153 return p+1;
1154 }
1155
1156 /*
1157 * exe_only means that we only want to detect .exe files, but not scripts
1158 * (which do not have an extension)
1159 */
1160 static char *lookup_prog(const char *dir, int dirlen, const char *cmd,
1161 int isexe, int exe_only)
1162 {
1163 char path[MAX_PATH];
1164 wchar_t wpath[MAX_PATH];
1165 snprintf(path, sizeof(path), "%.*s\\%s.exe", dirlen, dir, cmd);
1166
1167 if (xutftowcs_path(wpath, path) < 0)
1168 return NULL;
1169
1170 if (!isexe && _waccess(wpath, F_OK) == 0)
1171 return xstrdup(path);
1172 wpath[wcslen(wpath)-4] = '\0';
1173 if ((!exe_only || isexe) && _waccess(wpath, F_OK) == 0) {
1174 if (!(GetFileAttributesW(wpath) & FILE_ATTRIBUTE_DIRECTORY)) {
1175 path[strlen(path)-4] = '\0';
1176 return xstrdup(path);
1177 }
1178 }
1179 return NULL;
1180 }
1181
1182 /*
1183 * Determines the absolute path of cmd using the split path in path.
1184 * If cmd contains a slash or backslash, no lookup is performed.
1185 */
1186 static char *path_lookup(const char *cmd, int exe_only)
1187 {
1188 const char *path;
1189 char *prog = NULL;
1190 int len = strlen(cmd);
1191 int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
1192
1193 if (strchr(cmd, '/') || strchr(cmd, '\\'))
1194 return xstrdup(cmd);
1195
1196 path = mingw_getenv("PATH");
1197 if (!path)
1198 return NULL;
1199
1200 while (!prog) {
1201 const char *sep = strchrnul(path, ';');
1202 int dirlen = sep - path;
1203 if (dirlen)
1204 prog = lookup_prog(path, dirlen, cmd, isexe, exe_only);
1205 if (!*sep)
1206 break;
1207 path = sep + 1;
1208 }
1209
1210 return prog;
1211 }
1212
1213 static const wchar_t *wcschrnul(const wchar_t *s, wchar_t c)
1214 {
1215 while (*s && *s != c)
1216 s++;
1217 return s;
1218 }
1219
1220 /* Compare only keys */
1221 static int wenvcmp(const void *a, const void *b)
1222 {
1223 wchar_t *p = *(wchar_t **)a, *q = *(wchar_t **)b;
1224 size_t p_len, q_len;
1225
1226 /* Find the keys */
1227 p_len = wcschrnul(p, L'=') - p;
1228 q_len = wcschrnul(q, L'=') - q;
1229
1230 /* If the length differs, include the shorter key's NUL */
1231 if (p_len < q_len)
1232 p_len++;
1233 else if (p_len > q_len)
1234 p_len = q_len + 1;
1235
1236 return _wcsnicmp(p, q, p_len);
1237 }
1238
1239 /*
1240 * Build an environment block combining the inherited environment
1241 * merged with the given list of settings.
1242 *
1243 * Values of the form "KEY=VALUE" in deltaenv override inherited values.
1244 * Values of the form "KEY" in deltaenv delete inherited values.
1245 *
1246 * Multiple entries in deltaenv for the same key are explicitly allowed.
1247 *
1248 * We return a contiguous block of UNICODE strings with a final trailing
1249 * zero word.
1250 */
1251 static wchar_t *make_environment_block(char **deltaenv)
1252 {
1253 wchar_t *wenv = GetEnvironmentStringsW(), *wdeltaenv, *result, *p;
1254 size_t wlen, s, delta_size, size;
1255
1256 wchar_t **array = NULL;
1257 size_t alloc = 0, nr = 0, i;
1258
1259 size = 1; /* for extra NUL at the end */
1260
1261 /* If there is no deltaenv to apply, simply return a copy. */
1262 if (!deltaenv || !*deltaenv) {
1263 for (p = wenv; p && *p; ) {
1264 size_t s = wcslen(p) + 1;
1265 size += s;
1266 p += s;
1267 }
1268
1269 ALLOC_ARRAY(result, size);
1270 COPY_ARRAY(result, wenv, size);
1271 FreeEnvironmentStringsW(wenv);
1272 return result;
1273 }
1274
1275 /*
1276 * If there is a deltaenv, let's accumulate all keys into `array`,
1277 * sort them using the stable git_stable_qsort() and then copy,
1278 * skipping duplicate keys
1279 */
1280 for (p = wenv; p && *p; ) {
1281 ALLOC_GROW(array, nr + 1, alloc);
1282 s = wcslen(p) + 1;
1283 array[nr++] = p;
1284 p += s;
1285 size += s;
1286 }
1287
1288 /* (over-)assess size needed for wchar version of deltaenv */
1289 for (delta_size = 0, i = 0; deltaenv[i]; i++)
1290 delta_size += strlen(deltaenv[i]) * 2 + 1;
1291 ALLOC_ARRAY(wdeltaenv, delta_size);
1292
1293 /* convert the deltaenv, appending to array */
1294 for (i = 0, p = wdeltaenv; deltaenv[i]; i++) {
1295 ALLOC_GROW(array, nr + 1, alloc);
1296 wlen = xutftowcs(p, deltaenv[i], wdeltaenv + delta_size - p);
1297 array[nr++] = p;
1298 p += wlen + 1;
1299 }
1300
1301 git_stable_qsort(array, nr, sizeof(*array), wenvcmp);
1302 ALLOC_ARRAY(result, size + delta_size);
1303
1304 for (p = result, i = 0; i < nr; i++) {
1305 /* Skip any duplicate keys; last one wins */
1306 while (i + 1 < nr && !wenvcmp(array + i, array + i + 1))
1307 i++;
1308
1309 /* Skip "to delete" entry */
1310 if (!wcschr(array[i], L'='))
1311 continue;
1312
1313 size = wcslen(array[i]) + 1;
1314 COPY_ARRAY(p, array[i], size);
1315 p += size;
1316 }
1317 *p = L'\0';
1318
1319 free(array);
1320 free(wdeltaenv);
1321 FreeEnvironmentStringsW(wenv);
1322 return result;
1323 }
1324
1325 static void do_unset_environment_variables(void)
1326 {
1327 static int done;
1328 char *p = unset_environment_variables;
1329
1330 if (done || !p)
1331 return;
1332 done = 1;
1333
1334 for (;;) {
1335 char *comma = strchr(p, ',');
1336
1337 if (comma)
1338 *comma = '\0';
1339 unsetenv(p);
1340 if (!comma)
1341 break;
1342 p = comma + 1;
1343 }
1344 }
1345
1346 struct pinfo_t {
1347 struct pinfo_t *next;
1348 pid_t pid;
1349 HANDLE proc;
1350 };
1351 static struct pinfo_t *pinfo = NULL;
1352 CRITICAL_SECTION pinfo_cs;
1353
1354 /* Used to match and chomp off path components */
1355 static inline int match_last_path_component(const char *path, size_t *len,
1356 const char *component)
1357 {
1358 size_t component_len = strlen(component);
1359 if (*len < component_len + 1 ||
1360 !is_dir_sep(path[*len - component_len - 1]) ||
1361 fspathncmp(path + *len - component_len, component, component_len))
1362 return 0;
1363 *len -= component_len + 1;
1364 /* chomp off repeated dir separators */
1365 while (*len > 0 && is_dir_sep(path[*len - 1]))
1366 (*len)--;
1367 return 1;
1368 }
1369
1370 static int is_msys2_sh(const char *cmd)
1371 {
1372 if (cmd && !strcmp(cmd, "sh")) {
1373 static int ret = -1;
1374 char *p;
1375
1376 if (ret >= 0)
1377 return ret;
1378
1379 p = path_lookup(cmd, 0);
1380 if (!p)
1381 ret = 0;
1382 else {
1383 size_t len = strlen(p);
1384
1385 ret = match_last_path_component(p, &len, "sh.exe") &&
1386 match_last_path_component(p, &len, "bin") &&
1387 match_last_path_component(p, &len, "usr");
1388 free(p);
1389 }
1390 return ret;
1391 }
1392 return 0;
1393 }
1394
1395 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1396 const char *dir,
1397 int prepend_cmd, int fhin, int fhout, int fherr)
1398 {
1399 STARTUPINFOW si;
1400 PROCESS_INFORMATION pi;
1401 struct strbuf args;
1402 wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1403 unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1404 BOOL ret;
1405 HANDLE cons;
1406 const char *(*quote_arg)(const char *arg) =
1407 is_msys2_sh(*argv) ? quote_arg_msys2 : quote_arg_msvc;
1408
1409 do_unset_environment_variables();
1410
1411 /* Determine whether or not we are associated to a console */
1412 cons = CreateFileW(L"CONOUT$", GENERIC_WRITE,
1413 FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1414 FILE_ATTRIBUTE_NORMAL, NULL);
1415 if (cons == INVALID_HANDLE_VALUE) {
1416 /* There is no console associated with this process.
1417 * Since the child is a console process, Windows
1418 * would normally create a console window. But
1419 * since we'll be redirecting std streams, we do
1420 * not need the console.
1421 * It is necessary to use DETACHED_PROCESS
1422 * instead of CREATE_NO_WINDOW to make ssh
1423 * recognize that it has no console.
1424 */
1425 flags |= DETACHED_PROCESS;
1426 } else {
1427 /* There is already a console. If we specified
1428 * DETACHED_PROCESS here, too, Windows would
1429 * disassociate the child from the console.
1430 * The same is true for CREATE_NO_WINDOW.
1431 * Go figure!
1432 */
1433 CloseHandle(cons);
1434 }
1435 memset(&si, 0, sizeof(si));
1436 si.cb = sizeof(si);
1437 si.dwFlags = STARTF_USESTDHANDLES;
1438 si.hStdInput = winansi_get_osfhandle(fhin);
1439 si.hStdOutput = winansi_get_osfhandle(fhout);
1440 si.hStdError = winansi_get_osfhandle(fherr);
1441
1442 if (*argv && !strcmp(cmd, *argv))
1443 wcmd[0] = L'\0';
1444 else if (xutftowcs_path(wcmd, cmd) < 0)
1445 return -1;
1446 if (dir && xutftowcs_path(wdir, dir) < 0)
1447 return -1;
1448
1449 /* concatenate argv, quoting args as we go */
1450 strbuf_init(&args, 0);
1451 if (prepend_cmd) {
1452 char *quoted = (char *)quote_arg(cmd);
1453 strbuf_addstr(&args, quoted);
1454 if (quoted != cmd)
1455 free(quoted);
1456 }
1457 for (; *argv; argv++) {
1458 char *quoted = (char *)quote_arg(*argv);
1459 if (*args.buf)
1460 strbuf_addch(&args, ' ');
1461 strbuf_addstr(&args, quoted);
1462 if (quoted != *argv)
1463 free(quoted);
1464 }
1465
1466 ALLOC_ARRAY(wargs, st_add(st_mult(2, args.len), 1));
1467 xutftowcs(wargs, args.buf, 2 * args.len + 1);
1468 strbuf_release(&args);
1469
1470 wenvblk = make_environment_block(deltaenv);
1471
1472 memset(&pi, 0, sizeof(pi));
1473 ret = CreateProcessW(*wcmd ? wcmd : NULL, wargs, NULL, NULL, TRUE,
1474 flags, wenvblk, dir ? wdir : NULL, &si, &pi);
1475
1476 free(wenvblk);
1477 free(wargs);
1478
1479 if (!ret) {
1480 errno = ENOENT;
1481 return -1;
1482 }
1483 CloseHandle(pi.hThread);
1484
1485 /*
1486 * The process ID is the human-readable identifier of the process
1487 * that we want to present in log and error messages. The handle
1488 * is not useful for this purpose. But we cannot close it, either,
1489 * because it is not possible to turn a process ID into a process
1490 * handle after the process terminated.
1491 * Keep the handle in a list for waitpid.
1492 */
1493 EnterCriticalSection(&pinfo_cs);
1494 {
1495 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1496 info->pid = pi.dwProcessId;
1497 info->proc = pi.hProcess;
1498 info->next = pinfo;
1499 pinfo = info;
1500 }
1501 LeaveCriticalSection(&pinfo_cs);
1502
1503 return (pid_t)pi.dwProcessId;
1504 }
1505
1506 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1507 {
1508 return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1509 }
1510
1511 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1512 const char *dir,
1513 int fhin, int fhout, int fherr)
1514 {
1515 pid_t pid;
1516 char *prog = path_lookup(cmd, 0);
1517
1518 if (!prog) {
1519 errno = ENOENT;
1520 pid = -1;
1521 }
1522 else {
1523 const char *interpr = parse_interpreter(prog);
1524
1525 if (interpr) {
1526 const char *argv0 = argv[0];
1527 char *iprog = path_lookup(interpr, 1);
1528 argv[0] = prog;
1529 if (!iprog) {
1530 errno = ENOENT;
1531 pid = -1;
1532 }
1533 else {
1534 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1535 fhin, fhout, fherr);
1536 free(iprog);
1537 }
1538 argv[0] = argv0;
1539 }
1540 else
1541 pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1542 fhin, fhout, fherr);
1543 free(prog);
1544 }
1545 return pid;
1546 }
1547
1548 static int try_shell_exec(const char *cmd, char *const *argv)
1549 {
1550 const char *interpr = parse_interpreter(cmd);
1551 char *prog;
1552 int pid = 0;
1553
1554 if (!interpr)
1555 return 0;
1556 prog = path_lookup(interpr, 1);
1557 if (prog) {
1558 int exec_id;
1559 int argc = 0;
1560 #ifndef _MSC_VER
1561 const
1562 #endif
1563 char **argv2;
1564 while (argv[argc]) argc++;
1565 ALLOC_ARRAY(argv2, argc + 1);
1566 argv2[0] = (char *)cmd; /* full path to the script file */
1567 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1568 exec_id = trace2_exec(prog, argv2);
1569 pid = mingw_spawnv(prog, argv2, 1);
1570 if (pid >= 0) {
1571 int status;
1572 if (waitpid(pid, &status, 0) < 0)
1573 status = 255;
1574 trace2_exec_result(exec_id, status);
1575 exit(status);
1576 }
1577 trace2_exec_result(exec_id, -1);
1578 pid = 1; /* indicate that we tried but failed */
1579 free(prog);
1580 free(argv2);
1581 }
1582 return pid;
1583 }
1584
1585 int mingw_execv(const char *cmd, char *const *argv)
1586 {
1587 /* check if git_command is a shell script */
1588 if (!try_shell_exec(cmd, argv)) {
1589 int pid, status;
1590 int exec_id;
1591
1592 exec_id = trace2_exec(cmd, (const char **)argv);
1593 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1594 if (pid < 0) {
1595 trace2_exec_result(exec_id, -1);
1596 return -1;
1597 }
1598 if (waitpid(pid, &status, 0) < 0)
1599 status = 255;
1600 trace2_exec_result(exec_id, status);
1601 exit(status);
1602 }
1603 return -1;
1604 }
1605
1606 int mingw_execvp(const char *cmd, char *const *argv)
1607 {
1608 char *prog = path_lookup(cmd, 0);
1609
1610 if (prog) {
1611 mingw_execv(prog, argv);
1612 free(prog);
1613 } else
1614 errno = ENOENT;
1615
1616 return -1;
1617 }
1618
1619 int mingw_kill(pid_t pid, int sig)
1620 {
1621 if (pid > 0 && sig == SIGTERM) {
1622 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1623
1624 if (TerminateProcess(h, -1)) {
1625 CloseHandle(h);
1626 return 0;
1627 }
1628
1629 errno = err_win_to_posix(GetLastError());
1630 CloseHandle(h);
1631 return -1;
1632 } else if (pid > 0 && sig == 0) {
1633 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1634 if (h) {
1635 CloseHandle(h);
1636 return 0;
1637 }
1638 }
1639
1640 errno = EINVAL;
1641 return -1;
1642 }
1643
1644 /*
1645 * UTF-8 versions of getenv(), putenv() and unsetenv().
1646 * Internally, they use the CRT's stock UNICODE routines
1647 * to avoid data loss.
1648 */
1649 char *mingw_getenv(const char *name)
1650 {
1651 #define GETENV_MAX_RETAIN 64
1652 static char *values[GETENV_MAX_RETAIN];
1653 static int value_counter;
1654 int len_key, len_value;
1655 wchar_t *w_key;
1656 char *value;
1657 wchar_t w_value[32768];
1658
1659 if (!name || !*name)
1660 return NULL;
1661
1662 len_key = strlen(name) + 1;
1663 /* We cannot use xcalloc() here because that uses getenv() itself */
1664 w_key = calloc(len_key, sizeof(wchar_t));
1665 if (!w_key)
1666 die("Out of memory, (tried to allocate %u wchar_t's)", len_key);
1667 xutftowcs(w_key, name, len_key);
1668 /* GetEnvironmentVariableW() only sets the last error upon failure */
1669 SetLastError(ERROR_SUCCESS);
1670 len_value = GetEnvironmentVariableW(w_key, w_value, ARRAY_SIZE(w_value));
1671 if (!len_value && GetLastError() == ERROR_ENVVAR_NOT_FOUND) {
1672 free(w_key);
1673 return NULL;
1674 }
1675 free(w_key);
1676
1677 len_value = len_value * 3 + 1;
1678 /* We cannot use xcalloc() here because that uses getenv() itself */
1679 value = calloc(len_value, sizeof(char));
1680 if (!value)
1681 die("Out of memory, (tried to allocate %u bytes)", len_value);
1682 xwcstoutf(value, w_value, len_value);
1683
1684 /*
1685 * We return `value` which is an allocated value and the caller is NOT
1686 * expecting to have to free it, so we keep a round-robin array,
1687 * invalidating the buffer after GETENV_MAX_RETAIN getenv() calls.
1688 */
1689 free(values[value_counter]);
1690 values[value_counter++] = value;
1691 if (value_counter >= ARRAY_SIZE(values))
1692 value_counter = 0;
1693
1694 return value;
1695 }
1696
1697 int mingw_putenv(const char *namevalue)
1698 {
1699 int size;
1700 wchar_t *wide, *equal;
1701 BOOL result;
1702
1703 if (!namevalue || !*namevalue)
1704 return 0;
1705
1706 size = strlen(namevalue) * 2 + 1;
1707 wide = calloc(size, sizeof(wchar_t));
1708 if (!wide)
1709 die("Out of memory, (tried to allocate %u wchar_t's)", size);
1710 xutftowcs(wide, namevalue, size);
1711 equal = wcschr(wide, L'=');
1712 if (!equal)
1713 result = SetEnvironmentVariableW(wide, NULL);
1714 else {
1715 *equal = L'\0';
1716 result = SetEnvironmentVariableW(wide, equal + 1);
1717 }
1718 free(wide);
1719
1720 if (!result)
1721 errno = err_win_to_posix(GetLastError());
1722
1723 return result ? 0 : -1;
1724 }
1725
1726 static void ensure_socket_initialization(void)
1727 {
1728 WSADATA wsa;
1729 static int initialized = 0;
1730
1731 if (initialized)
1732 return;
1733
1734 if (WSAStartup(MAKEWORD(2,2), &wsa))
1735 die("unable to initialize winsock subsystem, error %d",
1736 WSAGetLastError());
1737
1738 atexit((void(*)(void)) WSACleanup);
1739 initialized = 1;
1740 }
1741
1742 #undef gethostname
1743 int mingw_gethostname(char *name, int namelen)
1744 {
1745 ensure_socket_initialization();
1746 return gethostname(name, namelen);
1747 }
1748
1749 #undef gethostbyname
1750 struct hostent *mingw_gethostbyname(const char *host)
1751 {
1752 ensure_socket_initialization();
1753 return gethostbyname(host);
1754 }
1755
1756 #undef getaddrinfo
1757 int mingw_getaddrinfo(const char *node, const char *service,
1758 const struct addrinfo *hints, struct addrinfo **res)
1759 {
1760 ensure_socket_initialization();
1761 return getaddrinfo(node, service, hints, res);
1762 }
1763
1764 int mingw_socket(int domain, int type, int protocol)
1765 {
1766 int sockfd;
1767 SOCKET s;
1768
1769 ensure_socket_initialization();
1770 s = WSASocket(domain, type, protocol, NULL, 0, 0);
1771 if (s == INVALID_SOCKET) {
1772 /*
1773 * WSAGetLastError() values are regular BSD error codes
1774 * biased by WSABASEERR.
1775 * However, strerror() does not know about networking
1776 * specific errors, which are values beginning at 38 or so.
1777 * Therefore, we choose to leave the biased error code
1778 * in errno so that _if_ someone looks up the code somewhere,
1779 * then it is at least the number that are usually listed.
1780 */
1781 errno = WSAGetLastError();
1782 return -1;
1783 }
1784 /* convert into a file descriptor */
1785 if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1786 closesocket(s);
1787 return error("unable to make a socket file descriptor: %s",
1788 strerror(errno));
1789 }
1790 return sockfd;
1791 }
1792
1793 #undef connect
1794 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1795 {
1796 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1797 return connect(s, sa, sz);
1798 }
1799
1800 #undef bind
1801 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1802 {
1803 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1804 return bind(s, sa, sz);
1805 }
1806
1807 #undef setsockopt
1808 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1809 {
1810 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1811 return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1812 }
1813
1814 #undef shutdown
1815 int mingw_shutdown(int sockfd, int how)
1816 {
1817 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1818 return shutdown(s, how);
1819 }
1820
1821 #undef listen
1822 int mingw_listen(int sockfd, int backlog)
1823 {
1824 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1825 return listen(s, backlog);
1826 }
1827
1828 #undef accept
1829 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1830 {
1831 int sockfd2;
1832
1833 SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1834 SOCKET s2 = accept(s1, sa, sz);
1835
1836 /* convert into a file descriptor */
1837 if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1838 int err = errno;
1839 closesocket(s2);
1840 return error("unable to make a socket file descriptor: %s",
1841 strerror(err));
1842 }
1843 return sockfd2;
1844 }
1845
1846 #undef rename
1847 int mingw_rename(const char *pold, const char *pnew)
1848 {
1849 DWORD attrs, gle;
1850 int tries = 0;
1851 wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1852 if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1853 return -1;
1854
1855 /*
1856 * Try native rename() first to get errno right.
1857 * It is based on MoveFile(), which cannot overwrite existing files.
1858 */
1859 if (!_wrename(wpold, wpnew))
1860 return 0;
1861 if (errno != EEXIST)
1862 return -1;
1863 repeat:
1864 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1865 return 0;
1866 /* TODO: translate more errors */
1867 gle = GetLastError();
1868 if (gle == ERROR_ACCESS_DENIED &&
1869 (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1870 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1871 DWORD attrsold = GetFileAttributesW(wpold);
1872 if (attrsold == INVALID_FILE_ATTRIBUTES ||
1873 !(attrsold & FILE_ATTRIBUTE_DIRECTORY))
1874 errno = EISDIR;
1875 else if (!_wrmdir(wpnew))
1876 goto repeat;
1877 return -1;
1878 }
1879 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1880 SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1881 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1882 return 0;
1883 gle = GetLastError();
1884 /* revert file attributes on failure */
1885 SetFileAttributesW(wpnew, attrs);
1886 }
1887 }
1888 if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1889 /*
1890 * We assume that some other process had the source or
1891 * destination file open at the wrong moment and retry.
1892 * In order to give the other process a higher chance to
1893 * complete its operation, we give up our time slice now.
1894 * If we have to retry again, we do sleep a bit.
1895 */
1896 Sleep(delay[tries]);
1897 tries++;
1898 goto repeat;
1899 }
1900 if (gle == ERROR_ACCESS_DENIED &&
1901 ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1902 "Should I try again?", pold, pnew))
1903 goto repeat;
1904
1905 errno = EACCES;
1906 return -1;
1907 }
1908
1909 /*
1910 * Note that this doesn't return the actual pagesize, but
1911 * the allocation granularity. If future Windows specific git code
1912 * needs the real getpagesize function, we need to find another solution.
1913 */
1914 int mingw_getpagesize(void)
1915 {
1916 SYSTEM_INFO si;
1917 GetSystemInfo(&si);
1918 return si.dwAllocationGranularity;
1919 }
1920
1921 /* See https://msdn.microsoft.com/en-us/library/windows/desktop/ms724435.aspx */
1922 enum EXTENDED_NAME_FORMAT {
1923 NameDisplay = 3,
1924 NameUserPrincipal = 8
1925 };
1926
1927 static char *get_extended_user_info(enum EXTENDED_NAME_FORMAT type)
1928 {
1929 DECLARE_PROC_ADDR(secur32.dll, BOOL, GetUserNameExW,
1930 enum EXTENDED_NAME_FORMAT, LPCWSTR, PULONG);
1931 static wchar_t wbuffer[1024];
1932 DWORD len;
1933
1934 if (!INIT_PROC_ADDR(GetUserNameExW))
1935 return NULL;
1936
1937 len = ARRAY_SIZE(wbuffer);
1938 if (GetUserNameExW(type, wbuffer, &len)) {
1939 char *converted = xmalloc((len *= 3));
1940 if (xwcstoutf(converted, wbuffer, len) >= 0)
1941 return converted;
1942 free(converted);
1943 }
1944
1945 return NULL;
1946 }
1947
1948 char *mingw_query_user_email(void)
1949 {
1950 return get_extended_user_info(NameUserPrincipal);
1951 }
1952
1953 struct passwd *getpwuid(int uid)
1954 {
1955 static unsigned initialized;
1956 static char user_name[100];
1957 static struct passwd *p;
1958 wchar_t buf[100];
1959 DWORD len;
1960
1961 if (initialized)
1962 return p;
1963
1964 len = ARRAY_SIZE(buf);
1965 if (!GetUserNameW(buf, &len)) {
1966 initialized = 1;
1967 return NULL;
1968 }
1969
1970 if (xwcstoutf(user_name, buf, sizeof(user_name)) < 0) {
1971 initialized = 1;
1972 return NULL;
1973 }
1974
1975 p = xmalloc(sizeof(*p));
1976 p->pw_name = user_name;
1977 p->pw_gecos = get_extended_user_info(NameDisplay);
1978 if (!p->pw_gecos)
1979 p->pw_gecos = "unknown";
1980 p->pw_dir = NULL;
1981
1982 initialized = 1;
1983 return p;
1984 }
1985
1986 static HANDLE timer_event;
1987 static HANDLE timer_thread;
1988 static int timer_interval;
1989 static int one_shot;
1990 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1991
1992 /* The timer works like this:
1993 * The thread, ticktack(), is a trivial routine that most of the time
1994 * only waits to receive the signal to terminate. The main thread tells
1995 * the thread to terminate by setting the timer_event to the signalled
1996 * state.
1997 * But ticktack() interrupts the wait state after the timer's interval
1998 * length to call the signal handler.
1999 */
2000
2001 static unsigned __stdcall ticktack(void *dummy)
2002 {
2003 while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
2004 mingw_raise(SIGALRM);
2005 if (one_shot)
2006 break;
2007 }
2008 return 0;
2009 }
2010
2011 static int start_timer_thread(void)
2012 {
2013 timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
2014 if (timer_event) {
2015 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
2016 if (!timer_thread )
2017 return errno = ENOMEM,
2018 error("cannot start timer thread");
2019 } else
2020 return errno = ENOMEM,
2021 error("cannot allocate resources for timer");
2022 return 0;
2023 }
2024
2025 static void stop_timer_thread(void)
2026 {
2027 if (timer_event)
2028 SetEvent(timer_event); /* tell thread to terminate */
2029 if (timer_thread) {
2030 int rc = WaitForSingleObject(timer_thread, 10000);
2031 if (rc == WAIT_TIMEOUT)
2032 error("timer thread did not terminate timely");
2033 else if (rc != WAIT_OBJECT_0)
2034 error("waiting for timer thread failed: %lu",
2035 GetLastError());
2036 CloseHandle(timer_thread);
2037 }
2038 if (timer_event)
2039 CloseHandle(timer_event);
2040 timer_event = NULL;
2041 timer_thread = NULL;
2042 }
2043
2044 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
2045 {
2046 return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
2047 }
2048
2049 int setitimer(int type, struct itimerval *in, struct itimerval *out)
2050 {
2051 static const struct timeval zero;
2052 static int atexit_done;
2053
2054 if (out != NULL)
2055 return errno = EINVAL,
2056 error("setitimer param 3 != NULL not implemented");
2057 if (!is_timeval_eq(&in->it_interval, &zero) &&
2058 !is_timeval_eq(&in->it_interval, &in->it_value))
2059 return errno = EINVAL,
2060 error("setitimer: it_interval must be zero or eq it_value");
2061
2062 if (timer_thread)
2063 stop_timer_thread();
2064
2065 if (is_timeval_eq(&in->it_value, &zero) &&
2066 is_timeval_eq(&in->it_interval, &zero))
2067 return 0;
2068
2069 timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
2070 one_shot = is_timeval_eq(&in->it_interval, &zero);
2071 if (!atexit_done) {
2072 atexit(stop_timer_thread);
2073 atexit_done = 1;
2074 }
2075 return start_timer_thread();
2076 }
2077
2078 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
2079 {
2080 if (sig != SIGALRM)
2081 return errno = EINVAL,
2082 error("sigaction only implemented for SIGALRM");
2083 if (out != NULL)
2084 return errno = EINVAL,
2085 error("sigaction: param 3 != NULL not implemented");
2086
2087 timer_fn = in->sa_handler;
2088 return 0;
2089 }
2090
2091 #undef signal
2092 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
2093 {
2094 sig_handler_t old;
2095
2096 switch (sig) {
2097 case SIGALRM:
2098 old = timer_fn;
2099 timer_fn = handler;
2100 break;
2101
2102 case SIGINT:
2103 old = sigint_fn;
2104 sigint_fn = handler;
2105 break;
2106
2107 default:
2108 return signal(sig, handler);
2109 }
2110
2111 return old;
2112 }
2113
2114 #undef raise
2115 int mingw_raise(int sig)
2116 {
2117 switch (sig) {
2118 case SIGALRM:
2119 if (timer_fn == SIG_DFL) {
2120 if (isatty(STDERR_FILENO))
2121 fputs("Alarm clock\n", stderr);
2122 exit(128 + SIGALRM);
2123 } else if (timer_fn != SIG_IGN)
2124 timer_fn(SIGALRM);
2125 return 0;
2126
2127 case SIGINT:
2128 if (sigint_fn == SIG_DFL)
2129 exit(128 + SIGINT);
2130 else if (sigint_fn != SIG_IGN)
2131 sigint_fn(SIGINT);
2132 return 0;
2133
2134 #if defined(_MSC_VER)
2135 case SIGILL:
2136 case SIGFPE:
2137 case SIGSEGV:
2138 case SIGTERM:
2139 case SIGBREAK:
2140 case SIGABRT:
2141 case SIGABRT_COMPAT:
2142 /*
2143 * The <signal.h> header in the MS C Runtime defines 8 signals
2144 * as being supported on the platform. Anything else causes an
2145 * "Invalid signal or error" (which in DEBUG builds causes the
2146 * Abort/Retry/Ignore dialog). We by-pass the CRT for things we
2147 * already know will fail.
2148 */
2149 return raise(sig);
2150 default:
2151 errno = EINVAL;
2152 return -1;
2153
2154 #else
2155
2156 default:
2157 return raise(sig);
2158
2159 #endif
2160
2161 }
2162 }
2163
2164 int link(const char *oldpath, const char *newpath)
2165 {
2166 wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
2167 if (xutftowcs_path(woldpath, oldpath) < 0 ||
2168 xutftowcs_path(wnewpath, newpath) < 0)
2169 return -1;
2170
2171 if (!CreateHardLinkW(wnewpath, woldpath, NULL)) {
2172 errno = err_win_to_posix(GetLastError());
2173 return -1;
2174 }
2175 return 0;
2176 }
2177
2178 pid_t waitpid(pid_t pid, int *status, int options)
2179 {
2180 HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
2181 FALSE, pid);
2182 if (!h) {
2183 errno = ECHILD;
2184 return -1;
2185 }
2186
2187 if (pid > 0 && options & WNOHANG) {
2188 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
2189 CloseHandle(h);
2190 return 0;
2191 }
2192 options &= ~WNOHANG;
2193 }
2194
2195 if (options == 0) {
2196 struct pinfo_t **ppinfo;
2197 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
2198 CloseHandle(h);
2199 return 0;
2200 }
2201
2202 if (status)
2203 GetExitCodeProcess(h, (LPDWORD)status);
2204
2205 EnterCriticalSection(&pinfo_cs);
2206
2207 ppinfo = &pinfo;
2208 while (*ppinfo) {
2209 struct pinfo_t *info = *ppinfo;
2210 if (info->pid == pid) {
2211 CloseHandle(info->proc);
2212 *ppinfo = info->next;
2213 free(info);
2214 break;
2215 }
2216 ppinfo = &info->next;
2217 }
2218
2219 LeaveCriticalSection(&pinfo_cs);
2220
2221 CloseHandle(h);
2222 return pid;
2223 }
2224 CloseHandle(h);
2225
2226 errno = EINVAL;
2227 return -1;
2228 }
2229
2230 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
2231 {
2232 int upos = 0, wpos = 0;
2233 const unsigned char *utf = (const unsigned char*) utfs;
2234 if (!utf || !wcs || wcslen < 1) {
2235 errno = EINVAL;
2236 return -1;
2237 }
2238 /* reserve space for \0 */
2239 wcslen--;
2240 if (utflen < 0)
2241 utflen = INT_MAX;
2242
2243 while (upos < utflen) {
2244 int c = utf[upos++] & 0xff;
2245 if (utflen == INT_MAX && c == 0)
2246 break;
2247
2248 if (wpos >= wcslen) {
2249 wcs[wpos] = 0;
2250 errno = ERANGE;
2251 return -1;
2252 }
2253
2254 if (c < 0x80) {
2255 /* ASCII */
2256 wcs[wpos++] = c;
2257 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2258 (utf[upos] & 0xc0) == 0x80) {
2259 /* 2-byte utf-8 */
2260 c = ((c & 0x1f) << 6);
2261 c |= (utf[upos++] & 0x3f);
2262 wcs[wpos++] = c;
2263 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2264 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2265 (utf[upos] & 0xc0) == 0x80 &&
2266 (utf[upos + 1] & 0xc0) == 0x80) {
2267 /* 3-byte utf-8 */
2268 c = ((c & 0x0f) << 12);
2269 c |= ((utf[upos++] & 0x3f) << 6);
2270 c |= (utf[upos++] & 0x3f);
2271 wcs[wpos++] = c;
2272 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2273 wpos + 1 < wcslen &&
2274 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2275 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2276 (utf[upos] & 0xc0) == 0x80 &&
2277 (utf[upos + 1] & 0xc0) == 0x80 &&
2278 (utf[upos + 2] & 0xc0) == 0x80) {
2279 /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2280 c = ((c & 0x07) << 18);
2281 c |= ((utf[upos++] & 0x3f) << 12);
2282 c |= ((utf[upos++] & 0x3f) << 6);
2283 c |= (utf[upos++] & 0x3f);
2284 c -= 0x10000;
2285 wcs[wpos++] = 0xd800 | (c >> 10);
2286 wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2287 } else if (c >= 0xa0) {
2288 /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2289 wcs[wpos++] = c;
2290 } else {
2291 /* invalid utf-8 byte, non-printable unicode: convert to hex */
2292 static const char *hex = "0123456789abcdef";
2293 wcs[wpos++] = hex[c >> 4];
2294 if (wpos < wcslen)
2295 wcs[wpos++] = hex[c & 0x0f];
2296 }
2297 }
2298 wcs[wpos] = 0;
2299 return wpos;
2300 }
2301
2302 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2303 {
2304 if (!wcs || !utf || utflen < 1) {
2305 errno = EINVAL;
2306 return -1;
2307 }
2308 utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2309 if (utflen)
2310 return utflen - 1;
2311 errno = ERANGE;
2312 return -1;
2313 }
2314
2315 static void setup_windows_environment(void)
2316 {
2317 char *tmp = getenv("TMPDIR");
2318
2319 /* on Windows it is TMP and TEMP */
2320 if (!tmp) {
2321 if (!(tmp = getenv("TMP")))
2322 tmp = getenv("TEMP");
2323 if (tmp) {
2324 setenv("TMPDIR", tmp, 1);
2325 tmp = getenv("TMPDIR");
2326 }
2327 }
2328
2329 if (tmp) {
2330 /*
2331 * Convert all dir separators to forward slashes,
2332 * to help shell commands called from the Git
2333 * executable (by not mistaking the dir separators
2334 * for escape characters).
2335 */
2336 convert_slashes(tmp);
2337 }
2338
2339 /* simulate TERM to enable auto-color (see color.c) */
2340 if (!getenv("TERM"))
2341 setenv("TERM", "cygwin", 1);
2342
2343 /* calculate HOME if not set */
2344 if (!getenv("HOME")) {
2345 /*
2346 * try $HOMEDRIVE$HOMEPATH - the home share may be a network
2347 * location, thus also check if the path exists (i.e. is not
2348 * disconnected)
2349 */
2350 if ((tmp = getenv("HOMEDRIVE"))) {
2351 struct strbuf buf = STRBUF_INIT;
2352 strbuf_addstr(&buf, tmp);
2353 if ((tmp = getenv("HOMEPATH"))) {
2354 strbuf_addstr(&buf, tmp);
2355 if (is_directory(buf.buf))
2356 setenv("HOME", buf.buf, 1);
2357 else
2358 tmp = NULL; /* use $USERPROFILE */
2359 }
2360 strbuf_release(&buf);
2361 }
2362 /* use $USERPROFILE if the home share is not available */
2363 if (!tmp && (tmp = getenv("USERPROFILE")))
2364 setenv("HOME", tmp, 1);
2365 }
2366 }
2367
2368 #if !defined(_MSC_VER)
2369 /*
2370 * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2371 * mingw startup code, see init.c in mingw runtime).
2372 */
2373 int _CRT_glob = 0;
2374 #endif
2375
2376 static NORETURN void die_startup(void)
2377 {
2378 fputs("fatal: not enough memory for initialization", stderr);
2379 exit(128);
2380 }
2381
2382 static void *malloc_startup(size_t size)
2383 {
2384 void *result = malloc(size);
2385 if (!result)
2386 die_startup();
2387 return result;
2388 }
2389
2390 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2391 {
2392 len = xwcstoutf(buffer, wcs, len) + 1;
2393 return memcpy(malloc_startup(len), buffer, len);
2394 }
2395
2396 static void maybe_redirect_std_handle(const wchar_t *key, DWORD std_id, int fd,
2397 DWORD desired_access, DWORD flags)
2398 {
2399 DWORD create_flag = fd ? OPEN_ALWAYS : OPEN_EXISTING;
2400 wchar_t buf[MAX_PATH];
2401 DWORD max = ARRAY_SIZE(buf);
2402 HANDLE handle;
2403 DWORD ret = GetEnvironmentVariableW(key, buf, max);
2404
2405 if (!ret || ret >= max)
2406 return;
2407
2408 /* make sure this does not leak into child processes */
2409 SetEnvironmentVariableW(key, NULL);
2410 if (!wcscmp(buf, L"off")) {
2411 close(fd);
2412 handle = GetStdHandle(std_id);
2413 if (handle != INVALID_HANDLE_VALUE)
2414 CloseHandle(handle);
2415 return;
2416 }
2417 if (std_id == STD_ERROR_HANDLE && !wcscmp(buf, L"2>&1")) {
2418 handle = GetStdHandle(STD_OUTPUT_HANDLE);
2419 if (handle == INVALID_HANDLE_VALUE) {
2420 close(fd);
2421 handle = GetStdHandle(std_id);
2422 if (handle != INVALID_HANDLE_VALUE)
2423 CloseHandle(handle);
2424 } else {
2425 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2426 SetStdHandle(std_id, handle);
2427 dup2(new_fd, fd);
2428 /* do *not* close the new_fd: that would close stdout */
2429 }
2430 return;
2431 }
2432 handle = CreateFileW(buf, desired_access, 0, NULL, create_flag,
2433 flags, NULL);
2434 if (handle != INVALID_HANDLE_VALUE) {
2435 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2436 SetStdHandle(std_id, handle);
2437 dup2(new_fd, fd);
2438 close(new_fd);
2439 }
2440 }
2441
2442 static void maybe_redirect_std_handles(void)
2443 {
2444 maybe_redirect_std_handle(L"GIT_REDIRECT_STDIN", STD_INPUT_HANDLE, 0,
2445 GENERIC_READ, FILE_ATTRIBUTE_NORMAL);
2446 maybe_redirect_std_handle(L"GIT_REDIRECT_STDOUT", STD_OUTPUT_HANDLE, 1,
2447 GENERIC_WRITE, FILE_ATTRIBUTE_NORMAL);
2448 maybe_redirect_std_handle(L"GIT_REDIRECT_STDERR", STD_ERROR_HANDLE, 2,
2449 GENERIC_WRITE, FILE_FLAG_NO_BUFFERING);
2450 }
2451
2452 #ifdef _MSC_VER
2453 #ifdef _DEBUG
2454 #include <crtdbg.h>
2455 #endif
2456 #endif
2457
2458 /*
2459 * We implement wmain() and compile with -municode, which would
2460 * normally ignore main(), but we call the latter from the former
2461 * so that we can handle non-ASCII command-line parameters
2462 * appropriately.
2463 *
2464 * To be more compatible with the core git code, we convert
2465 * argv into UTF8 and pass them directly to main().
2466 */
2467 int wmain(int argc, const wchar_t **wargv)
2468 {
2469 int i, maxlen, exit_status;
2470 char *buffer, **save;
2471 const char **argv;
2472
2473 trace2_initialize_clock();
2474
2475 #ifdef _MSC_VER
2476 #ifdef _DEBUG
2477 _CrtSetReportMode(_CRT_ASSERT, _CRTDBG_MODE_DEBUG);
2478 #endif
2479
2480 #ifdef USE_MSVC_CRTDBG
2481 _CrtSetDbgFlag(_CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF);
2482 #endif
2483 #endif
2484
2485 maybe_redirect_std_handles();
2486
2487 /* determine size of argv and environ conversion buffer */
2488 maxlen = wcslen(wargv[0]);
2489 for (i = 1; i < argc; i++)
2490 maxlen = max(maxlen, wcslen(wargv[i]));
2491
2492 /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2493 maxlen = 3 * maxlen + 1;
2494 buffer = malloc_startup(maxlen);
2495
2496 /*
2497 * Create a UTF-8 version of w_argv. Also create a "save" copy
2498 * to remember all the string pointers because parse_options()
2499 * will remove claimed items from the argv that we pass down.
2500 */
2501 ALLOC_ARRAY(argv, argc + 1);
2502 ALLOC_ARRAY(save, argc + 1);
2503 for (i = 0; i < argc; i++)
2504 argv[i] = save[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2505 argv[i] = save[i] = NULL;
2506 free(buffer);
2507
2508 /* fix Windows specific environment settings */
2509 setup_windows_environment();
2510
2511 unset_environment_variables = xstrdup("PERL5LIB");
2512
2513 /* initialize critical section for waitpid pinfo_t list */
2514 InitializeCriticalSection(&pinfo_cs);
2515
2516 /* set up default file mode and file modes for stdin/out/err */
2517 _fmode = _O_BINARY;
2518 _setmode(_fileno(stdin), _O_BINARY);
2519 _setmode(_fileno(stdout), _O_BINARY);
2520 _setmode(_fileno(stderr), _O_BINARY);
2521
2522 /* initialize Unicode console */
2523 winansi_init();
2524
2525 /* invoke the real main() using our utf8 version of argv. */
2526 exit_status = main(argc, argv);
2527
2528 for (i = 0; i < argc; i++)
2529 free(save[i]);
2530 free(save);
2531 free(argv);
2532
2533 return exit_status;
2534 }
2535
2536 int uname(struct utsname *buf)
2537 {
2538 unsigned v = (unsigned)GetVersion();
2539 memset(buf, 0, sizeof(*buf));
2540 xsnprintf(buf->sysname, sizeof(buf->sysname), "Windows");
2541 xsnprintf(buf->release, sizeof(buf->release),
2542 "%u.%u", v & 0xff, (v >> 8) & 0xff);
2543 /* assuming NT variants only.. */
2544 xsnprintf(buf->version, sizeof(buf->version),
2545 "%u", (v >> 16) & 0x7fff);
2546 return 0;
2547 }
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