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Merge branch 'rb/hpe'
[git.git] / compat / mingw.c
blobb459e1a291ab0fe906c9a53a0fbcc61ad2c7e153
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
11 #define HCAST(type, handle) ((type)(intptr_t)handle)
12
13 static const int delay[] = { 0, 1, 10, 20, 40 };
14
15 int err_win_to_posix(DWORD winerr)
16 {
17 int error = ENOSYS;
18 switch(winerr) {
19 case ERROR_ACCESS_DENIED: error = EACCES; break;
20 case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
21 case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
22 case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
23 case ERROR_ALREADY_EXISTS: error = EEXIST; break;
24 case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
25 case ERROR_BAD_COMMAND: error = EIO; break;
26 case ERROR_BAD_DEVICE: error = ENODEV; break;
27 case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
28 case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
29 case ERROR_BAD_FORMAT: error = ENOEXEC; break;
30 case ERROR_BAD_LENGTH: error = EINVAL; break;
31 case ERROR_BAD_PATHNAME: error = ENOENT; break;
32 case ERROR_BAD_PIPE: error = EPIPE; break;
33 case ERROR_BAD_UNIT: error = ENODEV; break;
34 case ERROR_BAD_USERNAME: error = EINVAL; break;
35 case ERROR_BROKEN_PIPE: error = EPIPE; break;
36 case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
37 case ERROR_BUSY: error = EBUSY; break;
38 case ERROR_BUSY_DRIVE: error = EBUSY; break;
39 case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
40 case ERROR_CANNOT_MAKE: error = EACCES; break;
41 case ERROR_CANTOPEN: error = EIO; break;
42 case ERROR_CANTREAD: error = EIO; break;
43 case ERROR_CANTWRITE: error = EIO; break;
44 case ERROR_CRC: error = EIO; break;
45 case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
46 case ERROR_DEVICE_IN_USE: error = EBUSY; break;
47 case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
48 case ERROR_DIRECTORY: error = EINVAL; break;
49 case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
50 case ERROR_DISK_CHANGE: error = EIO; break;
51 case ERROR_DISK_FULL: error = ENOSPC; break;
52 case ERROR_DRIVE_LOCKED: error = EBUSY; break;
53 case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
54 case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
55 case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
56 case ERROR_FILE_EXISTS: error = EEXIST; break;
57 case ERROR_FILE_INVALID: error = ENODEV; break;
58 case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
59 case ERROR_GEN_FAILURE: error = EIO; break;
60 case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
61 case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
62 case ERROR_INVALID_ACCESS: error = EACCES; break;
63 case ERROR_INVALID_ADDRESS: error = EFAULT; break;
64 case ERROR_INVALID_BLOCK: error = EFAULT; break;
65 case ERROR_INVALID_DATA: error = EINVAL; break;
66 case ERROR_INVALID_DRIVE: error = ENODEV; break;
67 case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
68 case ERROR_INVALID_FLAGS: error = EINVAL; break;
69 case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
70 case ERROR_INVALID_HANDLE: error = EBADF; break;
71 case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
72 case ERROR_INVALID_NAME: error = EINVAL; break;
73 case ERROR_INVALID_OWNER: error = EINVAL; break;
74 case ERROR_INVALID_PARAMETER: error = EINVAL; break;
75 case ERROR_INVALID_PASSWORD: error = EPERM; break;
76 case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
77 case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
78 case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
79 case ERROR_INVALID_WORKSTATION: error = EACCES; break;
80 case ERROR_IO_DEVICE: error = EIO; break;
81 case ERROR_IO_INCOMPLETE: error = EINTR; break;
82 case ERROR_LOCKED: error = EBUSY; break;
83 case ERROR_LOCK_VIOLATION: error = EACCES; break;
84 case ERROR_LOGON_FAILURE: error = EACCES; break;
85 case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
86 case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
87 case ERROR_MORE_DATA: error = EPIPE; break;
88 case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
89 case ERROR_NOACCESS: error = EFAULT; break;
90 case ERROR_NONE_MAPPED: error = EINVAL; break;
91 case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
92 case ERROR_NOT_READY: error = EAGAIN; break;
93 case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
94 case ERROR_NO_DATA: error = EPIPE; break;
95 case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
96 case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
97 case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
98 case ERROR_OPEN_FAILED: error = EIO; break;
99 case ERROR_OPEN_FILES: error = EBUSY; break;
100 case ERROR_OPERATION_ABORTED: error = EINTR; break;
101 case ERROR_OUTOFMEMORY: error = ENOMEM; break;
102 case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
103 case ERROR_PATH_BUSY: error = EBUSY; break;
104 case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
105 case ERROR_PIPE_BUSY: error = EBUSY; break;
106 case ERROR_PIPE_CONNECTED: error = EPIPE; break;
107 case ERROR_PIPE_LISTENING: error = EPIPE; break;
108 case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
109 case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
110 case ERROR_READ_FAULT: error = EIO; break;
111 case ERROR_SEEK: error = EIO; break;
112 case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
113 case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
114 case ERROR_SHARING_VIOLATION: error = EACCES; break;
115 case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
116 case ERROR_SWAPERROR: error = ENOENT; break;
117 case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
118 case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
119 case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
120 case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
121 case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
122 case ERROR_WRITE_FAULT: error = EIO; break;
123 case ERROR_WRITE_PROTECT: error = EROFS; break;
124 }
125 return error;
126 }
127
128 static inline int is_file_in_use_error(DWORD errcode)
129 {
130 switch (errcode) {
131 case ERROR_SHARING_VIOLATION:
132 case ERROR_ACCESS_DENIED:
133 return 1;
134 }
135
136 return 0;
137 }
138
139 static int read_yes_no_answer(void)
140 {
141 char answer[1024];
142
143 if (fgets(answer, sizeof(answer), stdin)) {
144 size_t answer_len = strlen(answer);
145 int got_full_line = 0, c;
146
147 /* remove the newline */
148 if (answer_len >= 2 && answer[answer_len-2] == '\r') {
149 answer[answer_len-2] = '\0';
150 got_full_line = 1;
151 } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
152 answer[answer_len-1] = '\0';
153 got_full_line = 1;
154 }
155 /* flush the buffer in case we did not get the full line */
156 if (!got_full_line)
157 while ((c = getchar()) != EOF && c != '\n')
158 ;
159 } else
160 /* we could not read, return the
161 * default answer which is no */
162 return 0;
163
164 if (tolower(answer[0]) == 'y' && !answer[1])
165 return 1;
166 if (!strncasecmp(answer, "yes", sizeof(answer)))
167 return 1;
168 if (tolower(answer[0]) == 'n' && !answer[1])
169 return 0;
170 if (!strncasecmp(answer, "no", sizeof(answer)))
171 return 0;
172
173 /* did not find an answer we understand */
174 return -1;
175 }
176
177 static int ask_yes_no_if_possible(const char *format, ...)
178 {
179 char question[4096];
180 const char *retry_hook[] = { NULL, NULL, NULL };
181 va_list args;
182
183 va_start(args, format);
184 vsnprintf(question, sizeof(question), format, args);
185 va_end(args);
186
187 if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) {
188 retry_hook[1] = question;
189 return !run_command_v_opt(retry_hook, 0);
190 }
191
192 if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
193 return 0;
194
195 while (1) {
196 int answer;
197 fprintf(stderr, "%s (y/n) ", question);
198
199 if ((answer = read_yes_no_answer()) >= 0)
200 return answer;
201
202 fprintf(stderr, "Sorry, I did not understand your answer. "
203 "Please type 'y' or 'n'\n");
204 }
205 }
206
207 /* Windows only */
208 enum hide_dotfiles_type {
209 HIDE_DOTFILES_FALSE = 0,
210 HIDE_DOTFILES_TRUE,
211 HIDE_DOTFILES_DOTGITONLY
212 };
213
214 static enum hide_dotfiles_type hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
215 static char *unset_environment_variables;
216
217 int mingw_core_config(const char *var, const char *value, void *cb)
218 {
219 if (!strcmp(var, "core.hidedotfiles")) {
220 if (value && !strcasecmp(value, "dotgitonly"))
221 hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
222 else
223 hide_dotfiles = git_config_bool(var, value);
224 return 0;
225 }
226
227 if (!strcmp(var, "core.unsetenvvars")) {
228 free(unset_environment_variables);
229 unset_environment_variables = xstrdup(value);
230 return 0;
231 }
232
233 return 0;
234 }
235
236 /* Normalizes NT paths as returned by some low-level APIs. */
237 static wchar_t *normalize_ntpath(wchar_t *wbuf)
238 {
239 int i;
240 /* fix absolute path prefixes */
241 if (wbuf[0] == '\\') {
242 /* strip NT namespace prefixes */
243 if (!wcsncmp(wbuf, L"\\??\\", 4) ||
244 !wcsncmp(wbuf, L"\\\\?\\", 4))
245 wbuf += 4;
246 else if (!wcsnicmp(wbuf, L"\\DosDevices\\", 12))
247 wbuf += 12;
248 /* replace remaining '...UNC\' with '\\' */
249 if (!wcsnicmp(wbuf, L"UNC\\", 4)) {
250 wbuf += 2;
251 *wbuf = '\\';
252 }
253 }
254 /* convert backslashes to slashes */
255 for (i = 0; wbuf[i]; i++)
256 if (wbuf[i] == '\\')
257 wbuf[i] = '/';
258 return wbuf;
259 }
260
261 int mingw_unlink(const char *pathname)
262 {
263 int ret, tries = 0;
264 wchar_t wpathname[MAX_PATH];
265 if (xutftowcs_path(wpathname, pathname) < 0)
266 return -1;
267
268 /* read-only files cannot be removed */
269 _wchmod(wpathname, 0666);
270 while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
271 if (!is_file_in_use_error(GetLastError()))
272 break;
273 /*
274 * We assume that some other process had the source or
275 * destination file open at the wrong moment and retry.
276 * In order to give the other process a higher chance to
277 * complete its operation, we give up our time slice now.
278 * If we have to retry again, we do sleep a bit.
279 */
280 Sleep(delay[tries]);
281 tries++;
282 }
283 while (ret == -1 && is_file_in_use_error(GetLastError()) &&
284 ask_yes_no_if_possible("Unlink of file '%s' failed. "
285 "Should I try again?", pathname))
286 ret = _wunlink(wpathname);
287 return ret;
288 }
289
290 static int is_dir_empty(const wchar_t *wpath)
291 {
292 WIN32_FIND_DATAW findbuf;
293 HANDLE handle;
294 wchar_t wbuf[MAX_PATH + 2];
295 wcscpy(wbuf, wpath);
296 wcscat(wbuf, L"\\*");
297 handle = FindFirstFileW(wbuf, &findbuf);
298 if (handle == INVALID_HANDLE_VALUE)
299 return GetLastError() == ERROR_NO_MORE_FILES;
300
301 while (!wcscmp(findbuf.cFileName, L".") ||
302 !wcscmp(findbuf.cFileName, L".."))
303 if (!FindNextFileW(handle, &findbuf)) {
304 DWORD err = GetLastError();
305 FindClose(handle);
306 return err == ERROR_NO_MORE_FILES;
307 }
308 FindClose(handle);
309 return 0;
310 }
311
312 int mingw_rmdir(const char *pathname)
313 {
314 int ret, tries = 0;
315 wchar_t wpathname[MAX_PATH];
316 if (xutftowcs_path(wpathname, pathname) < 0)
317 return -1;
318
319 while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
320 if (!is_file_in_use_error(GetLastError()))
321 errno = err_win_to_posix(GetLastError());
322 if (errno != EACCES)
323 break;
324 if (!is_dir_empty(wpathname)) {
325 errno = ENOTEMPTY;
326 break;
327 }
328 /*
329 * We assume that some other process had the source or
330 * destination file open at the wrong moment and retry.
331 * In order to give the other process a higher chance to
332 * complete its operation, we give up our time slice now.
333 * If we have to retry again, we do sleep a bit.
334 */
335 Sleep(delay[tries]);
336 tries++;
337 }
338 while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
339 ask_yes_no_if_possible("Deletion of directory '%s' failed. "
340 "Should I try again?", pathname))
341 ret = _wrmdir(wpathname);
342 return ret;
343 }
344
345 static inline int needs_hiding(const char *path)
346 {
347 const char *basename;
348
349 if (hide_dotfiles == HIDE_DOTFILES_FALSE)
350 return 0;
351
352 /* We cannot use basename(), as it would remove trailing slashes */
353 win32_skip_dos_drive_prefix((char **)&path);
354 if (!*path)
355 return 0;
356
357 for (basename = path; *path; path++)
358 if (is_dir_sep(*path)) {
359 do {
360 path++;
361 } while (is_dir_sep(*path));
362 /* ignore trailing slashes */
363 if (*path)
364 basename = path;
365 }
366
367 if (hide_dotfiles == HIDE_DOTFILES_TRUE)
368 return *basename == '.';
369
370 assert(hide_dotfiles == HIDE_DOTFILES_DOTGITONLY);
371 return !strncasecmp(".git", basename, 4) &&
372 (!basename[4] || is_dir_sep(basename[4]));
373 }
374
375 static int set_hidden_flag(const wchar_t *path, int set)
376 {
377 DWORD original = GetFileAttributesW(path), modified;
378 if (set)
379 modified = original | FILE_ATTRIBUTE_HIDDEN;
380 else
381 modified = original & ~FILE_ATTRIBUTE_HIDDEN;
382 if (original == modified || SetFileAttributesW(path, modified))
383 return 0;
384 errno = err_win_to_posix(GetLastError());
385 return -1;
386 }
387
388 int mingw_mkdir(const char *path, int mode)
389 {
390 int ret;
391 wchar_t wpath[MAX_PATH];
392 if (xutftowcs_path(wpath, path) < 0)
393 return -1;
394 ret = _wmkdir(wpath);
395 if (!ret && needs_hiding(path))
396 return set_hidden_flag(wpath, 1);
397 return ret;
398 }
399
400 /*
401 * Calling CreateFile() using FILE_APPEND_DATA and without FILE_WRITE_DATA
402 * is documented in [1] as opening a writable file handle in append mode.
403 * (It is believed that) this is atomic since it is maintained by the
404 * kernel unlike the O_APPEND flag which is racily maintained by the CRT.
405 *
406 * [1] https://docs.microsoft.com/en-us/windows/desktop/fileio/file-access-rights-constants
407 *
408 * This trick does not appear to work for named pipes. Instead it creates
409 * a named pipe client handle that cannot be written to. Callers should
410 * just use the regular _wopen() for them. (And since client handle gets
411 * bound to a unique server handle, it isn't really an issue.)
412 */
413 static int mingw_open_append(wchar_t const *wfilename, int oflags, ...)
414 {
415 HANDLE handle;
416 int fd;
417 DWORD create = (oflags & O_CREAT) ? OPEN_ALWAYS : OPEN_EXISTING;
418
419 /* only these flags are supported */
420 if ((oflags & ~O_CREAT) != (O_WRONLY | O_APPEND))
421 return errno = ENOSYS, -1;
422
423 /*
424 * FILE_SHARE_WRITE is required to permit child processes
425 * to append to the file.
426 */
427 handle = CreateFileW(wfilename, FILE_APPEND_DATA,
428 FILE_SHARE_WRITE | FILE_SHARE_READ,
429 NULL, create, FILE_ATTRIBUTE_NORMAL, NULL);
430 if (handle == INVALID_HANDLE_VALUE)
431 return errno = err_win_to_posix(GetLastError()), -1;
432
433 /*
434 * No O_APPEND here, because the CRT uses it only to reset the
435 * file pointer to EOF before each write(); but that is not
436 * necessary (and may lead to races) for a file created with
437 * FILE_APPEND_DATA.
438 */
439 fd = _open_osfhandle((intptr_t)handle, O_BINARY);
440 if (fd < 0)
441 CloseHandle(handle);
442 return fd;
443 }
444
445 /*
446 * Does the pathname map to the local named pipe filesystem?
447 * That is, does it have a "//./pipe/" prefix?
448 */
449 static int is_local_named_pipe_path(const char *filename)
450 {
451 return (is_dir_sep(filename[0]) &&
452 is_dir_sep(filename[1]) &&
453 filename[2] == '.' &&
454 is_dir_sep(filename[3]) &&
455 !strncasecmp(filename+4, "pipe", 4) &&
456 is_dir_sep(filename[8]) &&
457 filename[9]);
458 }
459
460 int mingw_open (const char *filename, int oflags, ...)
461 {
462 typedef int (*open_fn_t)(wchar_t const *wfilename, int oflags, ...);
463 va_list args;
464 unsigned mode;
465 int fd;
466 wchar_t wfilename[MAX_PATH];
467 open_fn_t open_fn;
468
469 va_start(args, oflags);
470 mode = va_arg(args, int);
471 va_end(args);
472
473 if (filename && !strcmp(filename, "/dev/null"))
474 filename = "nul";
475
476 if ((oflags & O_APPEND) && !is_local_named_pipe_path(filename))
477 open_fn = mingw_open_append;
478 else
479 open_fn = _wopen;
480
481 if (xutftowcs_path(wfilename, filename) < 0)
482 return -1;
483 fd = open_fn(wfilename, oflags, mode);
484
485 if (fd < 0 && (oflags & O_ACCMODE) != O_RDONLY && errno == EACCES) {
486 DWORD attrs = GetFileAttributesW(wfilename);
487 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
488 errno = EISDIR;
489 }
490 if ((oflags & O_CREAT) && needs_hiding(filename)) {
491 /*
492 * Internally, _wopen() uses the CreateFile() API which errors
493 * out with an ERROR_ACCESS_DENIED if CREATE_ALWAYS was
494 * specified and an already existing file's attributes do not
495 * match *exactly*. As there is no mode or flag we can set that
496 * would correspond to FILE_ATTRIBUTE_HIDDEN, let's just try
497 * again *without* the O_CREAT flag (that corresponds to the
498 * CREATE_ALWAYS flag of CreateFile()).
499 */
500 if (fd < 0 && errno == EACCES)
501 fd = open_fn(wfilename, oflags & ~O_CREAT, mode);
502 if (fd >= 0 && set_hidden_flag(wfilename, 1))
503 warning("could not mark '%s' as hidden.", filename);
504 }
505 return fd;
506 }
507
508 static BOOL WINAPI ctrl_ignore(DWORD type)
509 {
510 return TRUE;
511 }
512
513 #undef fgetc
514 int mingw_fgetc(FILE *stream)
515 {
516 int ch;
517 if (!isatty(_fileno(stream)))
518 return fgetc(stream);
519
520 SetConsoleCtrlHandler(ctrl_ignore, TRUE);
521 while (1) {
522 ch = fgetc(stream);
523 if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
524 break;
525
526 /* Ctrl+C was pressed, simulate SIGINT and retry */
527 mingw_raise(SIGINT);
528 }
529 SetConsoleCtrlHandler(ctrl_ignore, FALSE);
530 return ch;
531 }
532
533 #undef fopen
534 FILE *mingw_fopen (const char *filename, const char *otype)
535 {
536 int hide = needs_hiding(filename);
537 FILE *file;
538 wchar_t wfilename[MAX_PATH], wotype[4];
539 if (filename && !strcmp(filename, "/dev/null"))
540 filename = "nul";
541 if (xutftowcs_path(wfilename, filename) < 0 ||
542 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
543 return NULL;
544 if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
545 error("could not unhide %s", filename);
546 return NULL;
547 }
548 file = _wfopen(wfilename, wotype);
549 if (!file && GetLastError() == ERROR_INVALID_NAME)
550 errno = ENOENT;
551 if (file && hide && set_hidden_flag(wfilename, 1))
552 warning("could not mark '%s' as hidden.", filename);
553 return file;
554 }
555
556 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
557 {
558 int hide = needs_hiding(filename);
559 FILE *file;
560 wchar_t wfilename[MAX_PATH], wotype[4];
561 if (filename && !strcmp(filename, "/dev/null"))
562 filename = "nul";
563 if (xutftowcs_path(wfilename, filename) < 0 ||
564 xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
565 return NULL;
566 if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
567 error("could not unhide %s", filename);
568 return NULL;
569 }
570 file = _wfreopen(wfilename, wotype, stream);
571 if (file && hide && set_hidden_flag(wfilename, 1))
572 warning("could not mark '%s' as hidden.", filename);
573 return file;
574 }
575
576 #undef fflush
577 int mingw_fflush(FILE *stream)
578 {
579 int ret = fflush(stream);
580
581 /*
582 * write() is used behind the scenes of stdio output functions.
583 * Since git code does not check for errors after each stdio write
584 * operation, it can happen that write() is called by a later
585 * stdio function even if an earlier write() call failed. In the
586 * case of a pipe whose readable end was closed, only the first
587 * call to write() reports EPIPE on Windows. Subsequent write()
588 * calls report EINVAL. It is impossible to notice whether this
589 * fflush invocation triggered such a case, therefore, we have to
590 * catch all EINVAL errors whole-sale.
591 */
592 if (ret && errno == EINVAL)
593 errno = EPIPE;
594
595 return ret;
596 }
597
598 #undef write
599 ssize_t mingw_write(int fd, const void *buf, size_t len)
600 {
601 ssize_t result = write(fd, buf, len);
602
603 if (result < 0 && errno == EINVAL && buf) {
604 /* check if fd is a pipe */
605 HANDLE h = (HANDLE) _get_osfhandle(fd);
606 if (GetFileType(h) == FILE_TYPE_PIPE)
607 errno = EPIPE;
608 else
609 errno = EINVAL;
610 }
611
612 return result;
613 }
614
615 int mingw_access(const char *filename, int mode)
616 {
617 wchar_t wfilename[MAX_PATH];
618 if (xutftowcs_path(wfilename, filename) < 0)
619 return -1;
620 /* X_OK is not supported by the MSVCRT version */
621 return _waccess(wfilename, mode & ~X_OK);
622 }
623
624 int mingw_chdir(const char *dirname)
625 {
626 wchar_t wdirname[MAX_PATH];
627 if (xutftowcs_path(wdirname, dirname) < 0)
628 return -1;
629 return _wchdir(wdirname);
630 }
631
632 int mingw_chmod(const char *filename, int mode)
633 {
634 wchar_t wfilename[MAX_PATH];
635 if (xutftowcs_path(wfilename, filename) < 0)
636 return -1;
637 return _wchmod(wfilename, mode);
638 }
639
640 /*
641 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
642 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
643 */
644 static inline long long filetime_to_hnsec(const FILETIME *ft)
645 {
646 long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
647 /* Windows to Unix Epoch conversion */
648 return winTime - 116444736000000000LL;
649 }
650
651 static inline void filetime_to_timespec(const FILETIME *ft, struct timespec *ts)
652 {
653 long long hnsec = filetime_to_hnsec(ft);
654 ts->tv_sec = (time_t)(hnsec / 10000000);
655 ts->tv_nsec = (hnsec % 10000000) * 100;
656 }
657
658 /**
659 * Verifies that safe_create_leading_directories() would succeed.
660 */
661 static int has_valid_directory_prefix(wchar_t *wfilename)
662 {
663 int n = wcslen(wfilename);
664
665 while (n > 0) {
666 wchar_t c = wfilename[--n];
667 DWORD attributes;
668
669 if (!is_dir_sep(c))
670 continue;
671
672 wfilename[n] = L'\0';
673 attributes = GetFileAttributesW(wfilename);
674 wfilename[n] = c;
675 if (attributes == FILE_ATTRIBUTE_DIRECTORY ||
676 attributes == FILE_ATTRIBUTE_DEVICE)
677 return 1;
678 if (attributes == INVALID_FILE_ATTRIBUTES)
679 switch (GetLastError()) {
680 case ERROR_PATH_NOT_FOUND:
681 continue;
682 case ERROR_FILE_NOT_FOUND:
683 /* This implies parent directory exists. */
684 return 1;
685 }
686 return 0;
687 }
688 return 1;
689 }
690
691 /* We keep the do_lstat code in a separate function to avoid recursion.
692 * When a path ends with a slash, the stat will fail with ENOENT. In
693 * this case, we strip the trailing slashes and stat again.
694 *
695 * If follow is true then act like stat() and report on the link
696 * target. Otherwise report on the link itself.
697 */
698 static int do_lstat(int follow, const char *file_name, struct stat *buf)
699 {
700 WIN32_FILE_ATTRIBUTE_DATA fdata;
701 wchar_t wfilename[MAX_PATH];
702 if (xutftowcs_path(wfilename, file_name) < 0)
703 return -1;
704
705 if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
706 buf->st_ino = 0;
707 buf->st_gid = 0;
708 buf->st_uid = 0;
709 buf->st_nlink = 1;
710 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
711 buf->st_size = fdata.nFileSizeLow |
712 (((off_t)fdata.nFileSizeHigh)<<32);
713 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
714 filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim));
715 filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim));
716 filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim));
717 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
718 WIN32_FIND_DATAW findbuf;
719 HANDLE handle = FindFirstFileW(wfilename, &findbuf);
720 if (handle != INVALID_HANDLE_VALUE) {
721 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
722 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
723 if (follow) {
724 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
725 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
726 } else {
727 buf->st_mode = S_IFLNK;
728 }
729 buf->st_mode |= S_IREAD;
730 if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
731 buf->st_mode |= S_IWRITE;
732 }
733 FindClose(handle);
734 }
735 }
736 return 0;
737 }
738 switch (GetLastError()) {
739 case ERROR_ACCESS_DENIED:
740 case ERROR_SHARING_VIOLATION:
741 case ERROR_LOCK_VIOLATION:
742 case ERROR_SHARING_BUFFER_EXCEEDED:
743 errno = EACCES;
744 break;
745 case ERROR_BUFFER_OVERFLOW:
746 errno = ENAMETOOLONG;
747 break;
748 case ERROR_NOT_ENOUGH_MEMORY:
749 errno = ENOMEM;
750 break;
751 case ERROR_PATH_NOT_FOUND:
752 if (!has_valid_directory_prefix(wfilename)) {
753 errno = ENOTDIR;
754 break;
755 }
756 /* fallthru */
757 default:
758 errno = ENOENT;
759 break;
760 }
761 return -1;
762 }
763
764 /* We provide our own lstat/fstat functions, since the provided
765 * lstat/fstat functions are so slow. These stat functions are
766 * tailored for Git's usage (read: fast), and are not meant to be
767 * complete. Note that Git stat()s are redirected to mingw_lstat()
768 * too, since Windows doesn't really handle symlinks that well.
769 */
770 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
771 {
772 int namelen;
773 char alt_name[PATH_MAX];
774
775 if (!do_lstat(follow, file_name, buf))
776 return 0;
777
778 /* if file_name ended in a '/', Windows returned ENOENT;
779 * try again without trailing slashes
780 */
781 if (errno != ENOENT)
782 return -1;
783
784 namelen = strlen(file_name);
785 if (namelen && file_name[namelen-1] != '/')
786 return -1;
787 while (namelen && file_name[namelen-1] == '/')
788 --namelen;
789 if (!namelen || namelen >= PATH_MAX)
790 return -1;
791
792 memcpy(alt_name, file_name, namelen);
793 alt_name[namelen] = 0;
794 return do_lstat(follow, alt_name, buf);
795 }
796
797 static int get_file_info_by_handle(HANDLE hnd, struct stat *buf)
798 {
799 BY_HANDLE_FILE_INFORMATION fdata;
800
801 if (!GetFileInformationByHandle(hnd, &fdata)) {
802 errno = err_win_to_posix(GetLastError());
803 return -1;
804 }
805
806 buf->st_ino = 0;
807 buf->st_gid = 0;
808 buf->st_uid = 0;
809 buf->st_nlink = 1;
810 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
811 buf->st_size = fdata.nFileSizeLow |
812 (((off_t)fdata.nFileSizeHigh)<<32);
813 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
814 filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim));
815 filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim));
816 filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim));
817 return 0;
818 }
819
820 int mingw_lstat(const char *file_name, struct stat *buf)
821 {
822 return do_stat_internal(0, file_name, buf);
823 }
824 int mingw_stat(const char *file_name, struct stat *buf)
825 {
826 return do_stat_internal(1, file_name, buf);
827 }
828
829 int mingw_fstat(int fd, struct stat *buf)
830 {
831 HANDLE fh = (HANDLE)_get_osfhandle(fd);
832 DWORD avail, type = GetFileType(fh) & ~FILE_TYPE_REMOTE;
833
834 switch (type) {
835 case FILE_TYPE_DISK:
836 return get_file_info_by_handle(fh, buf);
837
838 case FILE_TYPE_CHAR:
839 case FILE_TYPE_PIPE:
840 /* initialize stat fields */
841 memset(buf, 0, sizeof(*buf));
842 buf->st_nlink = 1;
843
844 if (type == FILE_TYPE_CHAR) {
845 buf->st_mode = _S_IFCHR;
846 } else {
847 buf->st_mode = _S_IFIFO;
848 if (PeekNamedPipe(fh, NULL, 0, NULL, &avail, NULL))
849 buf->st_size = avail;
850 }
851 return 0;
852
853 default:
854 errno = EBADF;
855 return -1;
856 }
857 }
858
859 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
860 {
861 long long winTime = t * 10000000LL + 116444736000000000LL;
862 ft->dwLowDateTime = winTime;
863 ft->dwHighDateTime = winTime >> 32;
864 }
865
866 int mingw_utime (const char *file_name, const struct utimbuf *times)
867 {
868 FILETIME mft, aft;
869 int fh, rc;
870 DWORD attrs;
871 wchar_t wfilename[MAX_PATH];
872 if (xutftowcs_path(wfilename, file_name) < 0)
873 return -1;
874
875 /* must have write permission */
876 attrs = GetFileAttributesW(wfilename);
877 if (attrs != INVALID_FILE_ATTRIBUTES &&
878 (attrs & FILE_ATTRIBUTE_READONLY)) {
879 /* ignore errors here; open() will report them */
880 SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
881 }
882
883 if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
884 rc = -1;
885 goto revert_attrs;
886 }
887
888 if (times) {
889 time_t_to_filetime(times->modtime, &mft);
890 time_t_to_filetime(times->actime, &aft);
891 } else {
892 GetSystemTimeAsFileTime(&mft);
893 aft = mft;
894 }
895 if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
896 errno = EINVAL;
897 rc = -1;
898 } else
899 rc = 0;
900 close(fh);
901
902 revert_attrs:
903 if (attrs != INVALID_FILE_ATTRIBUTES &&
904 (attrs & FILE_ATTRIBUTE_READONLY)) {
905 /* ignore errors again */
906 SetFileAttributesW(wfilename, attrs);
907 }
908 return rc;
909 }
910
911 #undef strftime
912 size_t mingw_strftime(char *s, size_t max,
913 const char *format, const struct tm *tm)
914 {
915 size_t ret = strftime(s, max, format, tm);
916
917 if (!ret && errno == EINVAL)
918 die("invalid strftime format: '%s'", format);
919 return ret;
920 }
921
922 unsigned int sleep (unsigned int seconds)
923 {
924 Sleep(seconds*1000);
925 return 0;
926 }
927
928 char *mingw_mktemp(char *template)
929 {
930 wchar_t wtemplate[MAX_PATH];
931 if (xutftowcs_path(wtemplate, template) < 0)
932 return NULL;
933 if (!_wmktemp(wtemplate))
934 return NULL;
935 if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
936 return NULL;
937 return template;
938 }
939
940 int mkstemp(char *template)
941 {
942 char *filename = mktemp(template);
943 if (filename == NULL)
944 return -1;
945 return open(filename, O_RDWR | O_CREAT, 0600);
946 }
947
948 int gettimeofday(struct timeval *tv, void *tz)
949 {
950 FILETIME ft;
951 long long hnsec;
952
953 GetSystemTimeAsFileTime(&ft);
954 hnsec = filetime_to_hnsec(&ft);
955 tv->tv_sec = hnsec / 10000000;
956 tv->tv_usec = (hnsec % 10000000) / 10;
957 return 0;
958 }
959
960 int pipe(int filedes[2])
961 {
962 HANDLE h[2];
963
964 /* this creates non-inheritable handles */
965 if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
966 errno = err_win_to_posix(GetLastError());
967 return -1;
968 }
969 filedes[0] = _open_osfhandle(HCAST(int, h[0]), O_NOINHERIT);
970 if (filedes[0] < 0) {
971 CloseHandle(h[0]);
972 CloseHandle(h[1]);
973 return -1;
974 }
975 filedes[1] = _open_osfhandle(HCAST(int, h[1]), O_NOINHERIT);
976 if (filedes[1] < 0) {
977 close(filedes[0]);
978 CloseHandle(h[1]);
979 return -1;
980 }
981 return 0;
982 }
983
984 struct tm *gmtime_r(const time_t *timep, struct tm *result)
985 {
986 /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
987 memcpy(result, gmtime(timep), sizeof(struct tm));
988 return result;
989 }
990
991 struct tm *localtime_r(const time_t *timep, struct tm *result)
992 {
993 /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
994 memcpy(result, localtime(timep), sizeof(struct tm));
995 return result;
996 }
997
998 char *mingw_getcwd(char *pointer, int len)
999 {
1000 wchar_t cwd[MAX_PATH], wpointer[MAX_PATH];
1001 DWORD ret = GetCurrentDirectoryW(ARRAY_SIZE(cwd), cwd);
1002
1003 if (!ret || ret >= ARRAY_SIZE(cwd)) {
1004 errno = ret ? ENAMETOOLONG : err_win_to_posix(GetLastError());
1005 return NULL;
1006 }
1007 ret = GetLongPathNameW(cwd, wpointer, ARRAY_SIZE(wpointer));
1008 if (!ret && GetLastError() == ERROR_ACCESS_DENIED) {
1009 HANDLE hnd = CreateFileW(cwd, 0,
1010 FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL,
1011 OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
1012 if (hnd == INVALID_HANDLE_VALUE)
1013 return NULL;
1014 ret = GetFinalPathNameByHandleW(hnd, wpointer, ARRAY_SIZE(wpointer), 0);
1015 CloseHandle(hnd);
1016 if (!ret || ret >= ARRAY_SIZE(wpointer))
1017 return NULL;
1018 if (xwcstoutf(pointer, normalize_ntpath(wpointer), len) < 0)
1019 return NULL;
1020 return pointer;
1021 }
1022 if (!ret || ret >= ARRAY_SIZE(wpointer))
1023 return NULL;
1024 if (xwcstoutf(pointer, wpointer, len) < 0)
1025 return NULL;
1026 convert_slashes(pointer);
1027 return pointer;
1028 }
1029
1030 /*
1031 * See "Parsing C++ Command-Line Arguments" at Microsoft's Docs:
1032 * https://docs.microsoft.com/en-us/cpp/cpp/parsing-cpp-command-line-arguments
1033 */
1034 static const char *quote_arg(const char *arg)
1035 {
1036 /* count chars to quote */
1037 int len = 0, n = 0;
1038 int force_quotes = 0;
1039 char *q, *d;
1040 const char *p = arg;
1041 if (!*p) force_quotes = 1;
1042 while (*p) {
1043 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
1044 force_quotes = 1;
1045 else if (*p == '"')
1046 n++;
1047 else if (*p == '\\') {
1048 int count = 0;
1049 while (*p == '\\') {
1050 count++;
1051 p++;
1052 len++;
1053 }
1054 if (*p == '"')
1055 n += count*2 + 1;
1056 continue;
1057 }
1058 len++;
1059 p++;
1060 }
1061 if (!force_quotes && n == 0)
1062 return arg;
1063
1064 /* insert \ where necessary */
1065 d = q = xmalloc(st_add3(len, n, 3));
1066 *d++ = '"';
1067 while (*arg) {
1068 if (*arg == '"')
1069 *d++ = '\\';
1070 else if (*arg == '\\') {
1071 int count = 0;
1072 while (*arg == '\\') {
1073 count++;
1074 *d++ = *arg++;
1075 }
1076 if (*arg == '"') {
1077 while (count-- > 0)
1078 *d++ = '\\';
1079 *d++ = '\\';
1080 }
1081 }
1082 *d++ = *arg++;
1083 }
1084 *d++ = '"';
1085 *d++ = 0;
1086 return q;
1087 }
1088
1089 static const char *parse_interpreter(const char *cmd)
1090 {
1091 static char buf[100];
1092 char *p, *opt;
1093 int n, fd;
1094
1095 /* don't even try a .exe */
1096 n = strlen(cmd);
1097 if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
1098 return NULL;
1099
1100 fd = open(cmd, O_RDONLY);
1101 if (fd < 0)
1102 return NULL;
1103 n = read(fd, buf, sizeof(buf)-1);
1104 close(fd);
1105 if (n < 4) /* at least '#!/x' and not error */
1106 return NULL;
1107
1108 if (buf[0] != '#' || buf[1] != '!')
1109 return NULL;
1110 buf[n] = '\0';
1111 p = buf + strcspn(buf, "\r\n");
1112 if (!*p)
1113 return NULL;
1114
1115 *p = '\0';
1116 if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
1117 return NULL;
1118 /* strip options */
1119 if ((opt = strchr(p+1, ' ')))
1120 *opt = '\0';
1121 return p+1;
1122 }
1123
1124 /*
1125 * exe_only means that we only want to detect .exe files, but not scripts
1126 * (which do not have an extension)
1127 */
1128 static char *lookup_prog(const char *dir, int dirlen, const char *cmd,
1129 int isexe, int exe_only)
1130 {
1131 char path[MAX_PATH];
1132 snprintf(path, sizeof(path), "%.*s\\%s.exe", dirlen, dir, cmd);
1133
1134 if (!isexe && access(path, F_OK) == 0)
1135 return xstrdup(path);
1136 path[strlen(path)-4] = '\0';
1137 if ((!exe_only || isexe) && access(path, F_OK) == 0)
1138 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
1139 return xstrdup(path);
1140 return NULL;
1141 }
1142
1143 /*
1144 * Determines the absolute path of cmd using the split path in path.
1145 * If cmd contains a slash or backslash, no lookup is performed.
1146 */
1147 static char *path_lookup(const char *cmd, int exe_only)
1148 {
1149 const char *path;
1150 char *prog = NULL;
1151 int len = strlen(cmd);
1152 int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
1153
1154 if (strchr(cmd, '/') || strchr(cmd, '\\'))
1155 return xstrdup(cmd);
1156
1157 path = mingw_getenv("PATH");
1158 if (!path)
1159 return NULL;
1160
1161 while (!prog) {
1162 const char *sep = strchrnul(path, ';');
1163 int dirlen = sep - path;
1164 if (dirlen)
1165 prog = lookup_prog(path, dirlen, cmd, isexe, exe_only);
1166 if (!*sep)
1167 break;
1168 path = sep + 1;
1169 }
1170
1171 return prog;
1172 }
1173
1174 static const wchar_t *wcschrnul(const wchar_t *s, wchar_t c)
1175 {
1176 while (*s && *s != c)
1177 s++;
1178 return s;
1179 }
1180
1181 /* Compare only keys */
1182 static int wenvcmp(const void *a, const void *b)
1183 {
1184 wchar_t *p = *(wchar_t **)a, *q = *(wchar_t **)b;
1185 size_t p_len, q_len;
1186
1187 /* Find the keys */
1188 p_len = wcschrnul(p, L'=') - p;
1189 q_len = wcschrnul(q, L'=') - q;
1190
1191 /* If the length differs, include the shorter key's NUL */
1192 if (p_len < q_len)
1193 p_len++;
1194 else if (p_len > q_len)
1195 p_len = q_len + 1;
1196
1197 return _wcsnicmp(p, q, p_len);
1198 }
1199
1200 /* We need a stable sort to convert the environment between UTF-16 <-> UTF-8 */
1201 #ifndef INTERNAL_QSORT
1202 #include "qsort.c"
1203 #endif
1204
1205 /*
1206 * Build an environment block combining the inherited environment
1207 * merged with the given list of settings.
1208 *
1209 * Values of the form "KEY=VALUE" in deltaenv override inherited values.
1210 * Values of the form "KEY" in deltaenv delete inherited values.
1211 *
1212 * Multiple entries in deltaenv for the same key are explicitly allowed.
1213 *
1214 * We return a contiguous block of UNICODE strings with a final trailing
1215 * zero word.
1216 */
1217 static wchar_t *make_environment_block(char **deltaenv)
1218 {
1219 wchar_t *wenv = GetEnvironmentStringsW(), *wdeltaenv, *result, *p;
1220 size_t wlen, s, delta_size, size;
1221
1222 wchar_t **array = NULL;
1223 size_t alloc = 0, nr = 0, i;
1224
1225 size = 1; /* for extra NUL at the end */
1226
1227 /* If there is no deltaenv to apply, simply return a copy. */
1228 if (!deltaenv || !*deltaenv) {
1229 for (p = wenv; p && *p; ) {
1230 size_t s = wcslen(p) + 1;
1231 size += s;
1232 p += s;
1233 }
1234
1235 ALLOC_ARRAY(result, size);
1236 memcpy(result, wenv, size * sizeof(*wenv));
1237 FreeEnvironmentStringsW(wenv);
1238 return result;
1239 }
1240
1241 /*
1242 * If there is a deltaenv, let's accumulate all keys into `array`,
1243 * sort them using the stable git_qsort() and then copy, skipping
1244 * duplicate keys
1245 */
1246 for (p = wenv; p && *p; ) {
1247 ALLOC_GROW(array, nr + 1, alloc);
1248 s = wcslen(p) + 1;
1249 array[nr++] = p;
1250 p += s;
1251 size += s;
1252 }
1253
1254 /* (over-)assess size needed for wchar version of deltaenv */
1255 for (delta_size = 0, i = 0; deltaenv[i]; i++)
1256 delta_size += strlen(deltaenv[i]) * 2 + 1;
1257 ALLOC_ARRAY(wdeltaenv, delta_size);
1258
1259 /* convert the deltaenv, appending to array */
1260 for (i = 0, p = wdeltaenv; deltaenv[i]; i++) {
1261 ALLOC_GROW(array, nr + 1, alloc);
1262 wlen = xutftowcs(p, deltaenv[i], wdeltaenv + delta_size - p);
1263 array[nr++] = p;
1264 p += wlen + 1;
1265 }
1266
1267 git_qsort(array, nr, sizeof(*array), wenvcmp);
1268 ALLOC_ARRAY(result, size + delta_size);
1269
1270 for (p = result, i = 0; i < nr; i++) {
1271 /* Skip any duplicate keys; last one wins */
1272 while (i + 1 < nr && !wenvcmp(array + i, array + i + 1))
1273 i++;
1274
1275 /* Skip "to delete" entry */
1276 if (!wcschr(array[i], L'='))
1277 continue;
1278
1279 size = wcslen(array[i]) + 1;
1280 memcpy(p, array[i], size * sizeof(*p));
1281 p += size;
1282 }
1283 *p = L'\0';
1284
1285 free(array);
1286 free(wdeltaenv);
1287 FreeEnvironmentStringsW(wenv);
1288 return result;
1289 }
1290
1291 static void do_unset_environment_variables(void)
1292 {
1293 static int done;
1294 char *p = unset_environment_variables;
1295
1296 if (done || !p)
1297 return;
1298 done = 1;
1299
1300 for (;;) {
1301 char *comma = strchr(p, ',');
1302
1303 if (comma)
1304 *comma = '\0';
1305 unsetenv(p);
1306 if (!comma)
1307 break;
1308 p = comma + 1;
1309 }
1310 }
1311
1312 struct pinfo_t {
1313 struct pinfo_t *next;
1314 pid_t pid;
1315 HANDLE proc;
1316 };
1317 static struct pinfo_t *pinfo = NULL;
1318 CRITICAL_SECTION pinfo_cs;
1319
1320 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1321 const char *dir,
1322 int prepend_cmd, int fhin, int fhout, int fherr)
1323 {
1324 STARTUPINFOW si;
1325 PROCESS_INFORMATION pi;
1326 struct strbuf args;
1327 wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1328 unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1329 BOOL ret;
1330 HANDLE cons;
1331
1332 do_unset_environment_variables();
1333
1334 /* Determine whether or not we are associated to a console */
1335 cons = CreateFile("CONOUT$", GENERIC_WRITE,
1336 FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1337 FILE_ATTRIBUTE_NORMAL, NULL);
1338 if (cons == INVALID_HANDLE_VALUE) {
1339 /* There is no console associated with this process.
1340 * Since the child is a console process, Windows
1341 * would normally create a console window. But
1342 * since we'll be redirecting std streams, we do
1343 * not need the console.
1344 * It is necessary to use DETACHED_PROCESS
1345 * instead of CREATE_NO_WINDOW to make ssh
1346 * recognize that it has no console.
1347 */
1348 flags |= DETACHED_PROCESS;
1349 } else {
1350 /* There is already a console. If we specified
1351 * DETACHED_PROCESS here, too, Windows would
1352 * disassociate the child from the console.
1353 * The same is true for CREATE_NO_WINDOW.
1354 * Go figure!
1355 */
1356 CloseHandle(cons);
1357 }
1358 memset(&si, 0, sizeof(si));
1359 si.cb = sizeof(si);
1360 si.dwFlags = STARTF_USESTDHANDLES;
1361 si.hStdInput = winansi_get_osfhandle(fhin);
1362 si.hStdOutput = winansi_get_osfhandle(fhout);
1363 si.hStdError = winansi_get_osfhandle(fherr);
1364
1365 if (xutftowcs_path(wcmd, cmd) < 0)
1366 return -1;
1367 if (dir && xutftowcs_path(wdir, dir) < 0)
1368 return -1;
1369
1370 /* concatenate argv, quoting args as we go */
1371 strbuf_init(&args, 0);
1372 if (prepend_cmd) {
1373 char *quoted = (char *)quote_arg(cmd);
1374 strbuf_addstr(&args, quoted);
1375 if (quoted != cmd)
1376 free(quoted);
1377 }
1378 for (; *argv; argv++) {
1379 char *quoted = (char *)quote_arg(*argv);
1380 if (*args.buf)
1381 strbuf_addch(&args, ' ');
1382 strbuf_addstr(&args, quoted);
1383 if (quoted != *argv)
1384 free(quoted);
1385 }
1386
1387 ALLOC_ARRAY(wargs, st_add(st_mult(2, args.len), 1));
1388 xutftowcs(wargs, args.buf, 2 * args.len + 1);
1389 strbuf_release(&args);
1390
1391 wenvblk = make_environment_block(deltaenv);
1392
1393 memset(&pi, 0, sizeof(pi));
1394 ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1395 wenvblk, dir ? wdir : NULL, &si, &pi);
1396
1397 free(wenvblk);
1398 free(wargs);
1399
1400 if (!ret) {
1401 errno = ENOENT;
1402 return -1;
1403 }
1404 CloseHandle(pi.hThread);
1405
1406 /*
1407 * The process ID is the human-readable identifier of the process
1408 * that we want to present in log and error messages. The handle
1409 * is not useful for this purpose. But we cannot close it, either,
1410 * because it is not possible to turn a process ID into a process
1411 * handle after the process terminated.
1412 * Keep the handle in a list for waitpid.
1413 */
1414 EnterCriticalSection(&pinfo_cs);
1415 {
1416 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1417 info->pid = pi.dwProcessId;
1418 info->proc = pi.hProcess;
1419 info->next = pinfo;
1420 pinfo = info;
1421 }
1422 LeaveCriticalSection(&pinfo_cs);
1423
1424 return (pid_t)pi.dwProcessId;
1425 }
1426
1427 static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1428 {
1429 return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1430 }
1431
1432 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1433 const char *dir,
1434 int fhin, int fhout, int fherr)
1435 {
1436 pid_t pid;
1437 char *prog = path_lookup(cmd, 0);
1438
1439 if (!prog) {
1440 errno = ENOENT;
1441 pid = -1;
1442 }
1443 else {
1444 const char *interpr = parse_interpreter(prog);
1445
1446 if (interpr) {
1447 const char *argv0 = argv[0];
1448 char *iprog = path_lookup(interpr, 1);
1449 argv[0] = prog;
1450 if (!iprog) {
1451 errno = ENOENT;
1452 pid = -1;
1453 }
1454 else {
1455 pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1456 fhin, fhout, fherr);
1457 free(iprog);
1458 }
1459 argv[0] = argv0;
1460 }
1461 else
1462 pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1463 fhin, fhout, fherr);
1464 free(prog);
1465 }
1466 return pid;
1467 }
1468
1469 static int try_shell_exec(const char *cmd, char *const *argv)
1470 {
1471 const char *interpr = parse_interpreter(cmd);
1472 char *prog;
1473 int pid = 0;
1474
1475 if (!interpr)
1476 return 0;
1477 prog = path_lookup(interpr, 1);
1478 if (prog) {
1479 int argc = 0;
1480 const char **argv2;
1481 while (argv[argc]) argc++;
1482 ALLOC_ARRAY(argv2, argc + 1);
1483 argv2[0] = (char *)cmd; /* full path to the script file */
1484 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1485 pid = mingw_spawnv(prog, argv2, 1);
1486 if (pid >= 0) {
1487 int status;
1488 if (waitpid(pid, &status, 0) < 0)
1489 status = 255;
1490 exit(status);
1491 }
1492 pid = 1; /* indicate that we tried but failed */
1493 free(prog);
1494 free(argv2);
1495 }
1496 return pid;
1497 }
1498
1499 int mingw_execv(const char *cmd, char *const *argv)
1500 {
1501 /* check if git_command is a shell script */
1502 if (!try_shell_exec(cmd, argv)) {
1503 int pid, status;
1504
1505 pid = mingw_spawnv(cmd, (const char **)argv, 0);
1506 if (pid < 0)
1507 return -1;
1508 if (waitpid(pid, &status, 0) < 0)
1509 status = 255;
1510 exit(status);
1511 }
1512 return -1;
1513 }
1514
1515 int mingw_execvp(const char *cmd, char *const *argv)
1516 {
1517 char *prog = path_lookup(cmd, 0);
1518
1519 if (prog) {
1520 mingw_execv(prog, argv);
1521 free(prog);
1522 } else
1523 errno = ENOENT;
1524
1525 return -1;
1526 }
1527
1528 int mingw_kill(pid_t pid, int sig)
1529 {
1530 if (pid > 0 && sig == SIGTERM) {
1531 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1532
1533 if (TerminateProcess(h, -1)) {
1534 CloseHandle(h);
1535 return 0;
1536 }
1537
1538 errno = err_win_to_posix(GetLastError());
1539 CloseHandle(h);
1540 return -1;
1541 } else if (pid > 0 && sig == 0) {
1542 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1543 if (h) {
1544 CloseHandle(h);
1545 return 0;
1546 }
1547 }
1548
1549 errno = EINVAL;
1550 return -1;
1551 }
1552
1553 /*
1554 * UTF-8 versions of getenv(), putenv() and unsetenv().
1555 * Internally, they use the CRT's stock UNICODE routines
1556 * to avoid data loss.
1557 */
1558 char *mingw_getenv(const char *name)
1559 {
1560 #define GETENV_MAX_RETAIN 30
1561 static char *values[GETENV_MAX_RETAIN];
1562 static int value_counter;
1563 int len_key, len_value;
1564 wchar_t *w_key;
1565 char *value;
1566 wchar_t w_value[32768];
1567
1568 if (!name || !*name)
1569 return NULL;
1570
1571 len_key = strlen(name) + 1;
1572 /* We cannot use xcalloc() here because that uses getenv() itself */
1573 w_key = calloc(len_key, sizeof(wchar_t));
1574 if (!w_key)
1575 die("Out of memory, (tried to allocate %u wchar_t's)", len_key);
1576 xutftowcs(w_key, name, len_key);
1577 len_value = GetEnvironmentVariableW(w_key, w_value, ARRAY_SIZE(w_value));
1578 if (!len_value && GetLastError() == ERROR_ENVVAR_NOT_FOUND) {
1579 free(w_key);
1580 return NULL;
1581 }
1582 free(w_key);
1583
1584 len_value = len_value * 3 + 1;
1585 /* We cannot use xcalloc() here because that uses getenv() itself */
1586 value = calloc(len_value, sizeof(char));
1587 if (!value)
1588 die("Out of memory, (tried to allocate %u bytes)", len_value);
1589 xwcstoutf(value, w_value, len_value);
1590
1591 /*
1592 * We return `value` which is an allocated value and the caller is NOT
1593 * expecting to have to free it, so we keep a round-robin array,
1594 * invalidating the buffer after GETENV_MAX_RETAIN getenv() calls.
1595 */
1596 free(values[value_counter]);
1597 values[value_counter++] = value;
1598 if (value_counter >= ARRAY_SIZE(values))
1599 value_counter = 0;
1600
1601 return value;
1602 }
1603
1604 int mingw_putenv(const char *namevalue)
1605 {
1606 int size;
1607 wchar_t *wide, *equal;
1608 BOOL result;
1609
1610 if (!namevalue || !*namevalue)
1611 return 0;
1612
1613 size = strlen(namevalue) * 2 + 1;
1614 wide = calloc(size, sizeof(wchar_t));
1615 if (!wide)
1616 die("Out of memory, (tried to allocate %u wchar_t's)", size);
1617 xutftowcs(wide, namevalue, size);
1618 equal = wcschr(wide, L'=');
1619 if (!equal)
1620 result = SetEnvironmentVariableW(wide, NULL);
1621 else {
1622 *equal = L'\0';
1623 result = SetEnvironmentVariableW(wide, equal + 1);
1624 }
1625 free(wide);
1626
1627 if (!result)
1628 errno = err_win_to_posix(GetLastError());
1629
1630 return result ? 0 : -1;
1631 }
1632
1633 /*
1634 * Note, this isn't a complete replacement for getaddrinfo. It assumes
1635 * that service contains a numerical port, or that it is null. It
1636 * does a simple search using gethostbyname, and returns one IPv4 host
1637 * if one was found.
1638 */
1639 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1640 const struct addrinfo *hints,
1641 struct addrinfo **res)
1642 {
1643 struct hostent *h = NULL;
1644 struct addrinfo *ai;
1645 struct sockaddr_in *sin;
1646
1647 if (node) {
1648 h = gethostbyname(node);
1649 if (!h)
1650 return WSAGetLastError();
1651 }
1652
1653 ai = xmalloc(sizeof(struct addrinfo));
1654 *res = ai;
1655 ai->ai_flags = 0;
1656 ai->ai_family = AF_INET;
1657 ai->ai_socktype = hints ? hints->ai_socktype : 0;
1658 switch (ai->ai_socktype) {
1659 case SOCK_STREAM:
1660 ai->ai_protocol = IPPROTO_TCP;
1661 break;
1662 case SOCK_DGRAM:
1663 ai->ai_protocol = IPPROTO_UDP;
1664 break;
1665 default:
1666 ai->ai_protocol = 0;
1667 break;
1668 }
1669 ai->ai_addrlen = sizeof(struct sockaddr_in);
1670 if (hints && (hints->ai_flags & AI_CANONNAME))
1671 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1672 else
1673 ai->ai_canonname = NULL;
1674
1675 sin = xcalloc(1, ai->ai_addrlen);
1676 sin->sin_family = AF_INET;
1677 /* Note: getaddrinfo is supposed to allow service to be a string,
1678 * which should be looked up using getservbyname. This is
1679 * currently not implemented */
1680 if (service)
1681 sin->sin_port = htons(atoi(service));
1682 if (h)
1683 sin->sin_addr = *(struct in_addr *)h->h_addr;
1684 else if (hints && (hints->ai_flags & AI_PASSIVE))
1685 sin->sin_addr.s_addr = INADDR_ANY;
1686 else
1687 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1688 ai->ai_addr = (struct sockaddr *)sin;
1689 ai->ai_next = NULL;
1690 return 0;
1691 }
1692
1693 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1694 {
1695 free(res->ai_canonname);
1696 free(res->ai_addr);
1697 free(res);
1698 }
1699
1700 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1701 char *host, DWORD hostlen,
1702 char *serv, DWORD servlen, int flags)
1703 {
1704 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1705 if (sa->sa_family != AF_INET)
1706 return EAI_FAMILY;
1707 if (!host && !serv)
1708 return EAI_NONAME;
1709
1710 if (host && hostlen > 0) {
1711 struct hostent *ent = NULL;
1712 if (!(flags & NI_NUMERICHOST))
1713 ent = gethostbyaddr((const char *)&sin->sin_addr,
1714 sizeof(sin->sin_addr), AF_INET);
1715
1716 if (ent)
1717 snprintf(host, hostlen, "%s", ent->h_name);
1718 else if (flags & NI_NAMEREQD)
1719 return EAI_NONAME;
1720 else
1721 snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1722 }
1723
1724 if (serv && servlen > 0) {
1725 struct servent *ent = NULL;
1726 if (!(flags & NI_NUMERICSERV))
1727 ent = getservbyport(sin->sin_port,
1728 flags & NI_DGRAM ? "udp" : "tcp");
1729
1730 if (ent)
1731 snprintf(serv, servlen, "%s", ent->s_name);
1732 else
1733 snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1734 }
1735
1736 return 0;
1737 }
1738
1739 static HMODULE ipv6_dll = NULL;
1740 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1741 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1742 const struct addrinfo *hints,
1743 struct addrinfo **res);
1744 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1745 char *host, DWORD hostlen,
1746 char *serv, DWORD servlen, int flags);
1747 /*
1748 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1749 * don't need to try to load that one dynamically.
1750 */
1751
1752 static void socket_cleanup(void)
1753 {
1754 WSACleanup();
1755 if (ipv6_dll)
1756 FreeLibrary(ipv6_dll);
1757 ipv6_dll = NULL;
1758 ipv6_freeaddrinfo = freeaddrinfo_stub;
1759 ipv6_getaddrinfo = getaddrinfo_stub;
1760 ipv6_getnameinfo = getnameinfo_stub;
1761 }
1762
1763 static void ensure_socket_initialization(void)
1764 {
1765 WSADATA wsa;
1766 static int initialized = 0;
1767 const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1768 const char **name;
1769
1770 if (initialized)
1771 return;
1772
1773 if (WSAStartup(MAKEWORD(2,2), &wsa))
1774 die("unable to initialize winsock subsystem, error %d",
1775 WSAGetLastError());
1776
1777 for (name = libraries; *name; name++) {
1778 ipv6_dll = LoadLibraryExA(*name, NULL,
1779 LOAD_LIBRARY_SEARCH_SYSTEM32);
1780 if (!ipv6_dll)
1781 continue;
1782
1783 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1784 GetProcAddress(ipv6_dll, "freeaddrinfo");
1785 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1786 const struct addrinfo *,
1787 struct addrinfo **))
1788 GetProcAddress(ipv6_dll, "getaddrinfo");
1789 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1790 socklen_t, char *, DWORD,
1791 char *, DWORD, int))
1792 GetProcAddress(ipv6_dll, "getnameinfo");
1793 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1794 FreeLibrary(ipv6_dll);
1795 ipv6_dll = NULL;
1796 } else
1797 break;
1798 }
1799 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1800 ipv6_freeaddrinfo = freeaddrinfo_stub;
1801 ipv6_getaddrinfo = getaddrinfo_stub;
1802 ipv6_getnameinfo = getnameinfo_stub;
1803 }
1804
1805 atexit(socket_cleanup);
1806 initialized = 1;
1807 }
1808
1809 #undef gethostname
1810 int mingw_gethostname(char *name, int namelen)
1811 {
1812 ensure_socket_initialization();
1813 return gethostname(name, namelen);
1814 }
1815
1816 #undef gethostbyname
1817 struct hostent *mingw_gethostbyname(const char *host)
1818 {
1819 ensure_socket_initialization();
1820 return gethostbyname(host);
1821 }
1822
1823 void mingw_freeaddrinfo(struct addrinfo *res)
1824 {
1825 ipv6_freeaddrinfo(res);
1826 }
1827
1828 int mingw_getaddrinfo(const char *node, const char *service,
1829 const struct addrinfo *hints, struct addrinfo **res)
1830 {
1831 ensure_socket_initialization();
1832 return ipv6_getaddrinfo(node, service, hints, res);
1833 }
1834
1835 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1836 char *host, DWORD hostlen, char *serv, DWORD servlen,
1837 int flags)
1838 {
1839 ensure_socket_initialization();
1840 return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1841 }
1842
1843 int mingw_socket(int domain, int type, int protocol)
1844 {
1845 int sockfd;
1846 SOCKET s;
1847
1848 ensure_socket_initialization();
1849 s = WSASocket(domain, type, protocol, NULL, 0, 0);
1850 if (s == INVALID_SOCKET) {
1851 /*
1852 * WSAGetLastError() values are regular BSD error codes
1853 * biased by WSABASEERR.
1854 * However, strerror() does not know about networking
1855 * specific errors, which are values beginning at 38 or so.
1856 * Therefore, we choose to leave the biased error code
1857 * in errno so that _if_ someone looks up the code somewhere,
1858 * then it is at least the number that are usually listed.
1859 */
1860 errno = WSAGetLastError();
1861 return -1;
1862 }
1863 /* convert into a file descriptor */
1864 if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1865 closesocket(s);
1866 return error("unable to make a socket file descriptor: %s",
1867 strerror(errno));
1868 }
1869 return sockfd;
1870 }
1871
1872 #undef connect
1873 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1874 {
1875 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1876 return connect(s, sa, sz);
1877 }
1878
1879 #undef bind
1880 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1881 {
1882 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1883 return bind(s, sa, sz);
1884 }
1885
1886 #undef setsockopt
1887 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1888 {
1889 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1890 return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1891 }
1892
1893 #undef shutdown
1894 int mingw_shutdown(int sockfd, int how)
1895 {
1896 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1897 return shutdown(s, how);
1898 }
1899
1900 #undef listen
1901 int mingw_listen(int sockfd, int backlog)
1902 {
1903 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1904 return listen(s, backlog);
1905 }
1906
1907 #undef accept
1908 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1909 {
1910 int sockfd2;
1911
1912 SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1913 SOCKET s2 = accept(s1, sa, sz);
1914
1915 /* convert into a file descriptor */
1916 if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1917 int err = errno;
1918 closesocket(s2);
1919 return error("unable to make a socket file descriptor: %s",
1920 strerror(err));
1921 }
1922 return sockfd2;
1923 }
1924
1925 #undef rename
1926 int mingw_rename(const char *pold, const char *pnew)
1927 {
1928 DWORD attrs, gle;
1929 int tries = 0;
1930 wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1931 if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1932 return -1;
1933
1934 /*
1935 * Try native rename() first to get errno right.
1936 * It is based on MoveFile(), which cannot overwrite existing files.
1937 */
1938 if (!_wrename(wpold, wpnew))
1939 return 0;
1940 if (errno != EEXIST)
1941 return -1;
1942 repeat:
1943 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1944 return 0;
1945 /* TODO: translate more errors */
1946 gle = GetLastError();
1947 if (gle == ERROR_ACCESS_DENIED &&
1948 (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1949 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1950 DWORD attrsold = GetFileAttributesW(wpold);
1951 if (attrsold == INVALID_FILE_ATTRIBUTES ||
1952 !(attrsold & FILE_ATTRIBUTE_DIRECTORY))
1953 errno = EISDIR;
1954 else if (!_wrmdir(wpnew))
1955 goto repeat;
1956 return -1;
1957 }
1958 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1959 SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1960 if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1961 return 0;
1962 gle = GetLastError();
1963 /* revert file attributes on failure */
1964 SetFileAttributesW(wpnew, attrs);
1965 }
1966 }
1967 if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1968 /*
1969 * We assume that some other process had the source or
1970 * destination file open at the wrong moment and retry.
1971 * In order to give the other process a higher chance to
1972 * complete its operation, we give up our time slice now.
1973 * If we have to retry again, we do sleep a bit.
1974 */
1975 Sleep(delay[tries]);
1976 tries++;
1977 goto repeat;
1978 }
1979 if (gle == ERROR_ACCESS_DENIED &&
1980 ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1981 "Should I try again?", pold, pnew))
1982 goto repeat;
1983
1984 errno = EACCES;
1985 return -1;
1986 }
1987
1988 /*
1989 * Note that this doesn't return the actual pagesize, but
1990 * the allocation granularity. If future Windows specific git code
1991 * needs the real getpagesize function, we need to find another solution.
1992 */
1993 int mingw_getpagesize(void)
1994 {
1995 SYSTEM_INFO si;
1996 GetSystemInfo(&si);
1997 return si.dwAllocationGranularity;
1998 }
1999
2000 /* See https://msdn.microsoft.com/en-us/library/windows/desktop/ms724435.aspx */
2001 enum EXTENDED_NAME_FORMAT {
2002 NameDisplay = 3,
2003 NameUserPrincipal = 8
2004 };
2005
2006 static char *get_extended_user_info(enum EXTENDED_NAME_FORMAT type)
2007 {
2008 DECLARE_PROC_ADDR(secur32.dll, BOOL, GetUserNameExW,
2009 enum EXTENDED_NAME_FORMAT, LPCWSTR, PULONG);
2010 static wchar_t wbuffer[1024];
2011 DWORD len;
2012
2013 if (!INIT_PROC_ADDR(GetUserNameExW))
2014 return NULL;
2015
2016 len = ARRAY_SIZE(wbuffer);
2017 if (GetUserNameExW(type, wbuffer, &len)) {
2018 char *converted = xmalloc((len *= 3));
2019 if (xwcstoutf(converted, wbuffer, len) >= 0)
2020 return converted;
2021 free(converted);
2022 }
2023
2024 return NULL;
2025 }
2026
2027 char *mingw_query_user_email(void)
2028 {
2029 return get_extended_user_info(NameUserPrincipal);
2030 }
2031
2032 struct passwd *getpwuid(int uid)
2033 {
2034 static unsigned initialized;
2035 static char user_name[100];
2036 static struct passwd *p;
2037 DWORD len;
2038
2039 if (initialized)
2040 return p;
2041
2042 len = sizeof(user_name);
2043 if (!GetUserName(user_name, &len)) {
2044 initialized = 1;
2045 return NULL;
2046 }
2047
2048 p = xmalloc(sizeof(*p));
2049 p->pw_name = user_name;
2050 p->pw_gecos = get_extended_user_info(NameDisplay);
2051 if (!p->pw_gecos)
2052 p->pw_gecos = "unknown";
2053 p->pw_dir = NULL;
2054
2055 initialized = 1;
2056 return p;
2057 }
2058
2059 static HANDLE timer_event;
2060 static HANDLE timer_thread;
2061 static int timer_interval;
2062 static int one_shot;
2063 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
2064
2065 /* The timer works like this:
2066 * The thread, ticktack(), is a trivial routine that most of the time
2067 * only waits to receive the signal to terminate. The main thread tells
2068 * the thread to terminate by setting the timer_event to the signalled
2069 * state.
2070 * But ticktack() interrupts the wait state after the timer's interval
2071 * length to call the signal handler.
2072 */
2073
2074 static unsigned __stdcall ticktack(void *dummy)
2075 {
2076 while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
2077 mingw_raise(SIGALRM);
2078 if (one_shot)
2079 break;
2080 }
2081 return 0;
2082 }
2083
2084 static int start_timer_thread(void)
2085 {
2086 timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
2087 if (timer_event) {
2088 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
2089 if (!timer_thread )
2090 return errno = ENOMEM,
2091 error("cannot start timer thread");
2092 } else
2093 return errno = ENOMEM,
2094 error("cannot allocate resources for timer");
2095 return 0;
2096 }
2097
2098 static void stop_timer_thread(void)
2099 {
2100 if (timer_event)
2101 SetEvent(timer_event); /* tell thread to terminate */
2102 if (timer_thread) {
2103 int rc = WaitForSingleObject(timer_thread, 1000);
2104 if (rc == WAIT_TIMEOUT)
2105 error("timer thread did not terminate timely");
2106 else if (rc != WAIT_OBJECT_0)
2107 error("waiting for timer thread failed: %lu",
2108 GetLastError());
2109 CloseHandle(timer_thread);
2110 }
2111 if (timer_event)
2112 CloseHandle(timer_event);
2113 timer_event = NULL;
2114 timer_thread = NULL;
2115 }
2116
2117 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
2118 {
2119 return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
2120 }
2121
2122 int setitimer(int type, struct itimerval *in, struct itimerval *out)
2123 {
2124 static const struct timeval zero;
2125 static int atexit_done;
2126
2127 if (out != NULL)
2128 return errno = EINVAL,
2129 error("setitimer param 3 != NULL not implemented");
2130 if (!is_timeval_eq(&in->it_interval, &zero) &&
2131 !is_timeval_eq(&in->it_interval, &in->it_value))
2132 return errno = EINVAL,
2133 error("setitimer: it_interval must be zero or eq it_value");
2134
2135 if (timer_thread)
2136 stop_timer_thread();
2137
2138 if (is_timeval_eq(&in->it_value, &zero) &&
2139 is_timeval_eq(&in->it_interval, &zero))
2140 return 0;
2141
2142 timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
2143 one_shot = is_timeval_eq(&in->it_interval, &zero);
2144 if (!atexit_done) {
2145 atexit(stop_timer_thread);
2146 atexit_done = 1;
2147 }
2148 return start_timer_thread();
2149 }
2150
2151 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
2152 {
2153 if (sig != SIGALRM)
2154 return errno = EINVAL,
2155 error("sigaction only implemented for SIGALRM");
2156 if (out != NULL)
2157 return errno = EINVAL,
2158 error("sigaction: param 3 != NULL not implemented");
2159
2160 timer_fn = in->sa_handler;
2161 return 0;
2162 }
2163
2164 #undef signal
2165 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
2166 {
2167 sig_handler_t old;
2168
2169 switch (sig) {
2170 case SIGALRM:
2171 old = timer_fn;
2172 timer_fn = handler;
2173 break;
2174
2175 case SIGINT:
2176 old = sigint_fn;
2177 sigint_fn = handler;
2178 break;
2179
2180 default:
2181 return signal(sig, handler);
2182 }
2183
2184 return old;
2185 }
2186
2187 #undef raise
2188 int mingw_raise(int sig)
2189 {
2190 switch (sig) {
2191 case SIGALRM:
2192 if (timer_fn == SIG_DFL) {
2193 if (isatty(STDERR_FILENO))
2194 fputs("Alarm clock\n", stderr);
2195 exit(128 + SIGALRM);
2196 } else if (timer_fn != SIG_IGN)
2197 timer_fn(SIGALRM);
2198 return 0;
2199
2200 case SIGINT:
2201 if (sigint_fn == SIG_DFL)
2202 exit(128 + SIGINT);
2203 else if (sigint_fn != SIG_IGN)
2204 sigint_fn(SIGINT);
2205 return 0;
2206
2207 default:
2208 return raise(sig);
2209 }
2210 }
2211
2212 int link(const char *oldpath, const char *newpath)
2213 {
2214 wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
2215 if (xutftowcs_path(woldpath, oldpath) < 0 ||
2216 xutftowcs_path(wnewpath, newpath) < 0)
2217 return -1;
2218
2219 if (!CreateHardLinkW(wnewpath, woldpath, NULL)) {
2220 errno = err_win_to_posix(GetLastError());
2221 return -1;
2222 }
2223 return 0;
2224 }
2225
2226 pid_t waitpid(pid_t pid, int *status, int options)
2227 {
2228 HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
2229 FALSE, pid);
2230 if (!h) {
2231 errno = ECHILD;
2232 return -1;
2233 }
2234
2235 if (pid > 0 && options & WNOHANG) {
2236 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
2237 CloseHandle(h);
2238 return 0;
2239 }
2240 options &= ~WNOHANG;
2241 }
2242
2243 if (options == 0) {
2244 struct pinfo_t **ppinfo;
2245 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
2246 CloseHandle(h);
2247 return 0;
2248 }
2249
2250 if (status)
2251 GetExitCodeProcess(h, (LPDWORD)status);
2252
2253 EnterCriticalSection(&pinfo_cs);
2254
2255 ppinfo = &pinfo;
2256 while (*ppinfo) {
2257 struct pinfo_t *info = *ppinfo;
2258 if (info->pid == pid) {
2259 CloseHandle(info->proc);
2260 *ppinfo = info->next;
2261 free(info);
2262 break;
2263 }
2264 ppinfo = &info->next;
2265 }
2266
2267 LeaveCriticalSection(&pinfo_cs);
2268
2269 CloseHandle(h);
2270 return pid;
2271 }
2272 CloseHandle(h);
2273
2274 errno = EINVAL;
2275 return -1;
2276 }
2277
2278 int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
2279 {
2280 int upos = 0, wpos = 0;
2281 const unsigned char *utf = (const unsigned char*) utfs;
2282 if (!utf || !wcs || wcslen < 1) {
2283 errno = EINVAL;
2284 return -1;
2285 }
2286 /* reserve space for \0 */
2287 wcslen--;
2288 if (utflen < 0)
2289 utflen = INT_MAX;
2290
2291 while (upos < utflen) {
2292 int c = utf[upos++] & 0xff;
2293 if (utflen == INT_MAX && c == 0)
2294 break;
2295
2296 if (wpos >= wcslen) {
2297 wcs[wpos] = 0;
2298 errno = ERANGE;
2299 return -1;
2300 }
2301
2302 if (c < 0x80) {
2303 /* ASCII */
2304 wcs[wpos++] = c;
2305 } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2306 (utf[upos] & 0xc0) == 0x80) {
2307 /* 2-byte utf-8 */
2308 c = ((c & 0x1f) << 6);
2309 c |= (utf[upos++] & 0x3f);
2310 wcs[wpos++] = c;
2311 } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2312 !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2313 (utf[upos] & 0xc0) == 0x80 &&
2314 (utf[upos + 1] & 0xc0) == 0x80) {
2315 /* 3-byte utf-8 */
2316 c = ((c & 0x0f) << 12);
2317 c |= ((utf[upos++] & 0x3f) << 6);
2318 c |= (utf[upos++] & 0x3f);
2319 wcs[wpos++] = c;
2320 } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2321 wpos + 1 < wcslen &&
2322 !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2323 !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2324 (utf[upos] & 0xc0) == 0x80 &&
2325 (utf[upos + 1] & 0xc0) == 0x80 &&
2326 (utf[upos + 2] & 0xc0) == 0x80) {
2327 /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2328 c = ((c & 0x07) << 18);
2329 c |= ((utf[upos++] & 0x3f) << 12);
2330 c |= ((utf[upos++] & 0x3f) << 6);
2331 c |= (utf[upos++] & 0x3f);
2332 c -= 0x10000;
2333 wcs[wpos++] = 0xd800 | (c >> 10);
2334 wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2335 } else if (c >= 0xa0) {
2336 /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2337 wcs[wpos++] = c;
2338 } else {
2339 /* invalid utf-8 byte, non-printable unicode: convert to hex */
2340 static const char *hex = "0123456789abcdef";
2341 wcs[wpos++] = hex[c >> 4];
2342 if (wpos < wcslen)
2343 wcs[wpos++] = hex[c & 0x0f];
2344 }
2345 }
2346 wcs[wpos] = 0;
2347 return wpos;
2348 }
2349
2350 int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2351 {
2352 if (!wcs || !utf || utflen < 1) {
2353 errno = EINVAL;
2354 return -1;
2355 }
2356 utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2357 if (utflen)
2358 return utflen - 1;
2359 errno = ERANGE;
2360 return -1;
2361 }
2362
2363 static void setup_windows_environment(void)
2364 {
2365 char *tmp = getenv("TMPDIR");
2366
2367 /* on Windows it is TMP and TEMP */
2368 if (!tmp) {
2369 if (!(tmp = getenv("TMP")))
2370 tmp = getenv("TEMP");
2371 if (tmp) {
2372 setenv("TMPDIR", tmp, 1);
2373 tmp = getenv("TMPDIR");
2374 }
2375 }
2376
2377 if (tmp) {
2378 /*
2379 * Convert all dir separators to forward slashes,
2380 * to help shell commands called from the Git
2381 * executable (by not mistaking the dir separators
2382 * for escape characters).
2383 */
2384 convert_slashes(tmp);
2385 }
2386
2387 /* simulate TERM to enable auto-color (see color.c) */
2388 if (!getenv("TERM"))
2389 setenv("TERM", "cygwin", 1);
2390 }
2391
2392 /*
2393 * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2394 * mingw startup code, see init.c in mingw runtime).
2395 */
2396 int _CRT_glob = 0;
2397
2398 typedef struct {
2399 int newmode;
2400 } _startupinfo;
2401
2402 extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2403 _startupinfo *si);
2404
2405 static NORETURN void die_startup(void)
2406 {
2407 fputs("fatal: not enough memory for initialization", stderr);
2408 exit(128);
2409 }
2410
2411 static void *malloc_startup(size_t size)
2412 {
2413 void *result = malloc(size);
2414 if (!result)
2415 die_startup();
2416 return result;
2417 }
2418
2419 static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2420 {
2421 len = xwcstoutf(buffer, wcs, len) + 1;
2422 return memcpy(malloc_startup(len), buffer, len);
2423 }
2424
2425 static void maybe_redirect_std_handle(const wchar_t *key, DWORD std_id, int fd,
2426 DWORD desired_access, DWORD flags)
2427 {
2428 DWORD create_flag = fd ? OPEN_ALWAYS : OPEN_EXISTING;
2429 wchar_t buf[MAX_PATH];
2430 DWORD max = ARRAY_SIZE(buf);
2431 HANDLE handle;
2432 DWORD ret = GetEnvironmentVariableW(key, buf, max);
2433
2434 if (!ret || ret >= max)
2435 return;
2436
2437 /* make sure this does not leak into child processes */
2438 SetEnvironmentVariableW(key, NULL);
2439 if (!wcscmp(buf, L"off")) {
2440 close(fd);
2441 handle = GetStdHandle(std_id);
2442 if (handle != INVALID_HANDLE_VALUE)
2443 CloseHandle(handle);
2444 return;
2445 }
2446 if (std_id == STD_ERROR_HANDLE && !wcscmp(buf, L"2>&1")) {
2447 handle = GetStdHandle(STD_OUTPUT_HANDLE);
2448 if (handle == INVALID_HANDLE_VALUE) {
2449 close(fd);
2450 handle = GetStdHandle(std_id);
2451 if (handle != INVALID_HANDLE_VALUE)
2452 CloseHandle(handle);
2453 } else {
2454 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2455 SetStdHandle(std_id, handle);
2456 dup2(new_fd, fd);
2457 /* do *not* close the new_fd: that would close stdout */
2458 }
2459 return;
2460 }
2461 handle = CreateFileW(buf, desired_access, 0, NULL, create_flag,
2462 flags, NULL);
2463 if (handle != INVALID_HANDLE_VALUE) {
2464 int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2465 SetStdHandle(std_id, handle);
2466 dup2(new_fd, fd);
2467 close(new_fd);
2468 }
2469 }
2470
2471 static void maybe_redirect_std_handles(void)
2472 {
2473 maybe_redirect_std_handle(L"GIT_REDIRECT_STDIN", STD_INPUT_HANDLE, 0,
2474 GENERIC_READ, FILE_ATTRIBUTE_NORMAL);
2475 maybe_redirect_std_handle(L"GIT_REDIRECT_STDOUT", STD_OUTPUT_HANDLE, 1,
2476 GENERIC_WRITE, FILE_ATTRIBUTE_NORMAL);
2477 maybe_redirect_std_handle(L"GIT_REDIRECT_STDERR", STD_ERROR_HANDLE, 2,
2478 GENERIC_WRITE, FILE_FLAG_NO_BUFFERING);
2479 }
2480
2481 void mingw_startup(void)
2482 {
2483 int i, maxlen, argc;
2484 char *buffer;
2485 wchar_t **wenv, **wargv;
2486 _startupinfo si;
2487
2488 maybe_redirect_std_handles();
2489
2490 /* get wide char arguments and environment */
2491 si.newmode = 0;
2492 if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2493 die_startup();
2494
2495 /* determine size of argv and environ conversion buffer */
2496 maxlen = wcslen(wargv[0]);
2497 for (i = 1; i < argc; i++)
2498 maxlen = max(maxlen, wcslen(wargv[i]));
2499
2500 /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2501 maxlen = 3 * maxlen + 1;
2502 buffer = malloc_startup(maxlen);
2503
2504 /* convert command line arguments and environment to UTF-8 */
2505 for (i = 0; i < argc; i++)
2506 __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2507 free(buffer);
2508
2509 /* fix Windows specific environment settings */
2510 setup_windows_environment();
2511
2512 unset_environment_variables = xstrdup("PERL5LIB");
2513
2514 /* initialize critical section for waitpid pinfo_t list */
2515 InitializeCriticalSection(&pinfo_cs);
2516
2517 /* set up default file mode and file modes for stdin/out/err */
2518 _fmode = _O_BINARY;
2519 _setmode(_fileno(stdin), _O_BINARY);
2520 _setmode(_fileno(stdout), _O_BINARY);
2521 _setmode(_fileno(stderr), _O_BINARY);
2522
2523 /* initialize Unicode console */
2524 winansi_init();
2525 }
2526
2527 int uname(struct utsname *buf)
2528 {
2529 unsigned v = (unsigned)GetVersion();
2530 memset(buf, 0, sizeof(*buf));
2531 xsnprintf(buf->sysname, sizeof(buf->sysname), "Windows");
2532 xsnprintf(buf->release, sizeof(buf->release),
2533 "%u.%u", v & 0xff, (v >> 8) & 0xff);
2534 /* assuming NT variants only.. */
2535 xsnprintf(buf->version, sizeof(buf->version),
2536 "%u", (v >> 16) & 0x7fff);
2537 return 0;
2538 }
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