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