start_command: do not clobber cmd->env on Windows code path
[git/git.git] / compat / mingw.c
CommitLineData
f4626df5 1#include "../git-compat-util.h"
444dc903 2#include "win32.h"
28a559c0 3#include <conio.h>
7e5d7768 4#include "../strbuf.h"
f4626df5
JS
5
6unsigned int _CRT_fmode = _O_BINARY;
7
b3debd2b
PK
8static int err_win_to_posix(DWORD winerr)
9{
10 int error = ENOSYS;
11 switch(winerr) {
12 case ERROR_ACCESS_DENIED: error = EACCES; break;
13 case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
14 case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
15 case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
16 case ERROR_ALREADY_EXISTS: error = EEXIST; break;
17 case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
18 case ERROR_BAD_COMMAND: error = EIO; break;
19 case ERROR_BAD_DEVICE: error = ENODEV; break;
20 case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
21 case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
22 case ERROR_BAD_FORMAT: error = ENOEXEC; break;
23 case ERROR_BAD_LENGTH: error = EINVAL; break;
24 case ERROR_BAD_PATHNAME: error = ENOENT; break;
25 case ERROR_BAD_PIPE: error = EPIPE; break;
26 case ERROR_BAD_UNIT: error = ENODEV; break;
27 case ERROR_BAD_USERNAME: error = EINVAL; break;
28 case ERROR_BROKEN_PIPE: error = EPIPE; break;
29 case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
30 case ERROR_BUSY: error = EBUSY; break;
31 case ERROR_BUSY_DRIVE: error = EBUSY; break;
32 case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
33 case ERROR_CANNOT_MAKE: error = EACCES; break;
34 case ERROR_CANTOPEN: error = EIO; break;
35 case ERROR_CANTREAD: error = EIO; break;
36 case ERROR_CANTWRITE: error = EIO; break;
37 case ERROR_CRC: error = EIO; break;
38 case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
39 case ERROR_DEVICE_IN_USE: error = EBUSY; break;
40 case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
41 case ERROR_DIRECTORY: error = EINVAL; break;
42 case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
43 case ERROR_DISK_CHANGE: error = EIO; break;
44 case ERROR_DISK_FULL: error = ENOSPC; break;
45 case ERROR_DRIVE_LOCKED: error = EBUSY; break;
46 case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
47 case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
48 case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
49 case ERROR_FILE_EXISTS: error = EEXIST; break;
50 case ERROR_FILE_INVALID: error = ENODEV; break;
51 case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
52 case ERROR_GEN_FAILURE: error = EIO; break;
53 case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
54 case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
55 case ERROR_INVALID_ACCESS: error = EACCES; break;
56 case ERROR_INVALID_ADDRESS: error = EFAULT; break;
57 case ERROR_INVALID_BLOCK: error = EFAULT; break;
58 case ERROR_INVALID_DATA: error = EINVAL; break;
59 case ERROR_INVALID_DRIVE: error = ENODEV; break;
60 case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
61 case ERROR_INVALID_FLAGS: error = EINVAL; break;
62 case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
63 case ERROR_INVALID_HANDLE: error = EBADF; break;
64 case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
65 case ERROR_INVALID_NAME: error = EINVAL; break;
66 case ERROR_INVALID_OWNER: error = EINVAL; break;
67 case ERROR_INVALID_PARAMETER: error = EINVAL; break;
68 case ERROR_INVALID_PASSWORD: error = EPERM; break;
69 case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
70 case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
71 case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
72 case ERROR_INVALID_WORKSTATION: error = EACCES; break;
73 case ERROR_IO_DEVICE: error = EIO; break;
74 case ERROR_IO_INCOMPLETE: error = EINTR; break;
75 case ERROR_LOCKED: error = EBUSY; break;
76 case ERROR_LOCK_VIOLATION: error = EACCES; break;
77 case ERROR_LOGON_FAILURE: error = EACCES; break;
78 case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
79 case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
80 case ERROR_MORE_DATA: error = EPIPE; break;
81 case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
82 case ERROR_NOACCESS: error = EFAULT; break;
83 case ERROR_NONE_MAPPED: error = EINVAL; break;
84 case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
85 case ERROR_NOT_READY: error = EAGAIN; break;
86 case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
87 case ERROR_NO_DATA: error = EPIPE; break;
88 case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
89 case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
90 case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
91 case ERROR_OPEN_FAILED: error = EIO; break;
92 case ERROR_OPEN_FILES: error = EBUSY; break;
93 case ERROR_OPERATION_ABORTED: error = EINTR; break;
94 case ERROR_OUTOFMEMORY: error = ENOMEM; break;
95 case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
96 case ERROR_PATH_BUSY: error = EBUSY; break;
97 case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
98 case ERROR_PIPE_BUSY: error = EBUSY; break;
99 case ERROR_PIPE_CONNECTED: error = EPIPE; break;
100 case ERROR_PIPE_LISTENING: error = EPIPE; break;
101 case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
102 case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
103 case ERROR_READ_FAULT: error = EIO; break;
104 case ERROR_SEEK: error = EIO; break;
105 case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
106 case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
107 case ERROR_SHARING_VIOLATION: error = EACCES; break;
108 case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
109 case ERROR_SWAPERROR: error = ENOENT; break;
110 case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
111 case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
112 case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
113 case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
114 case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
115 case ERROR_WRITE_FAULT: error = EIO; break;
116 case ERROR_WRITE_PROTECT: error = EROFS; break;
117 }
118 return error;
119}
120
3e4a1ba0
JS
121#undef open
122int mingw_open (const char *filename, int oflags, ...)
123{
124 va_list args;
125 unsigned mode;
126 va_start(args, oflags);
127 mode = va_arg(args, int);
128 va_end(args);
129
130 if (!strcmp(filename, "/dev/null"))
131 filename = "nul";
132 int fd = open(filename, oflags, mode);
133 if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
134 DWORD attrs = GetFileAttributes(filename);
135 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
136 errno = EISDIR;
137 }
138 return fd;
139}
140
5411bdc4
MSO
141static inline time_t filetime_to_time_t(const FILETIME *ft)
142{
143 long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
144 winTime -= 116444736000000000LL; /* Windows to Unix Epoch conversion */
145 winTime /= 10000000; /* Nano to seconds resolution */
146 return (time_t)winTime;
147}
148
5411bdc4
MSO
149/* We keep the do_lstat code in a separate function to avoid recursion.
150 * When a path ends with a slash, the stat will fail with ENOENT. In
151 * this case, we strip the trailing slashes and stat again.
152 */
153static int do_lstat(const char *file_name, struct stat *buf)
154{
155 WIN32_FILE_ATTRIBUTE_DATA fdata;
156
444dc903 157 if (!(errno = get_file_attr(file_name, &fdata))) {
5411bdc4
MSO
158 buf->st_ino = 0;
159 buf->st_gid = 0;
160 buf->st_uid = 0;
180964f0 161 buf->st_nlink = 1;
444dc903 162 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
1d4e4cd4
JS
163 buf->st_size = fdata.nFileSizeLow |
164 (((off_t)fdata.nFileSizeHigh)<<32);
8252df62 165 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
5411bdc4
MSO
166 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
167 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
168 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
5411bdc4
MSO
169 return 0;
170 }
5411bdc4
MSO
171 return -1;
172}
173
174/* We provide our own lstat/fstat functions, since the provided
175 * lstat/fstat functions are so slow. These stat functions are
176 * tailored for Git's usage (read: fast), and are not meant to be
177 * complete. Note that Git stat()s are redirected to mingw_lstat()
178 * too, since Windows doesn't really handle symlinks that well.
179 */
180964f0 180int mingw_lstat(const char *file_name, struct stat *buf)
5411bdc4
MSO
181{
182 int namelen;
183 static char alt_name[PATH_MAX];
184
185 if (!do_lstat(file_name, buf))
186 return 0;
187
188 /* if file_name ended in a '/', Windows returned ENOENT;
189 * try again without trailing slashes
190 */
191 if (errno != ENOENT)
192 return -1;
193
194 namelen = strlen(file_name);
195 if (namelen && file_name[namelen-1] != '/')
196 return -1;
197 while (namelen && file_name[namelen-1] == '/')
198 --namelen;
199 if (!namelen || namelen >= PATH_MAX)
200 return -1;
201
202 memcpy(alt_name, file_name, namelen);
203 alt_name[namelen] = 0;
204 return do_lstat(alt_name, buf);
205}
206
207#undef fstat
180964f0 208int mingw_fstat(int fd, struct stat *buf)
5411bdc4
MSO
209{
210 HANDLE fh = (HANDLE)_get_osfhandle(fd);
211 BY_HANDLE_FILE_INFORMATION fdata;
212
213 if (fh == INVALID_HANDLE_VALUE) {
214 errno = EBADF;
215 return -1;
216 }
217 /* direct non-file handles to MS's fstat() */
180964f0 218 if (GetFileType(fh) != FILE_TYPE_DISK)
1d4e4cd4 219 return _fstati64(fd, buf);
5411bdc4
MSO
220
221 if (GetFileInformationByHandle(fh, &fdata)) {
5411bdc4
MSO
222 buf->st_ino = 0;
223 buf->st_gid = 0;
224 buf->st_uid = 0;
180964f0 225 buf->st_nlink = 1;
444dc903 226 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
1d4e4cd4
JS
227 buf->st_size = fdata.nFileSizeLow |
228 (((off_t)fdata.nFileSizeHigh)<<32);
8252df62 229 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
5411bdc4
MSO
230 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
231 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
232 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
233 return 0;
234 }
235 errno = EBADF;
236 return -1;
237}
238
7c0ffa1c
JS
239static inline void time_t_to_filetime(time_t t, FILETIME *ft)
240{
241 long long winTime = t * 10000000LL + 116444736000000000LL;
242 ft->dwLowDateTime = winTime;
243 ft->dwHighDateTime = winTime >> 32;
244}
245
246int mingw_utime (const char *file_name, const struct utimbuf *times)
247{
248 FILETIME mft, aft;
249 int fh, rc;
250
251 /* must have write permission */
252 if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0)
253 return -1;
254
255 time_t_to_filetime(times->modtime, &mft);
256 time_t_to_filetime(times->actime, &aft);
257 if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
258 errno = EINVAL;
259 rc = -1;
260 } else
261 rc = 0;
262 close(fh);
263 return rc;
264}
265
f4626df5
JS
266unsigned int sleep (unsigned int seconds)
267{
268 Sleep(seconds*1000);
269 return 0;
270}
271
272int mkstemp(char *template)
273{
274 char *filename = mktemp(template);
275 if (filename == NULL)
276 return -1;
277 return open(filename, O_RDWR | O_CREAT, 0600);
278}
279
280int gettimeofday(struct timeval *tv, void *tz)
281{
a42a0c2e
JS
282 SYSTEMTIME st;
283 struct tm tm;
284 GetSystemTime(&st);
285 tm.tm_year = st.wYear-1900;
286 tm.tm_mon = st.wMonth-1;
287 tm.tm_mday = st.wDay;
288 tm.tm_hour = st.wHour;
289 tm.tm_min = st.wMinute;
290 tm.tm_sec = st.wSecond;
291 tv->tv_sec = tm_to_time_t(&tm);
292 if (tv->tv_sec < 0)
293 return -1;
294 tv->tv_usec = st.wMilliseconds*1000;
295 return 0;
f4626df5
JS
296}
297
897bb8cb
JS
298int pipe(int filedes[2])
299{
300 int fd;
301 HANDLE h[2], parent;
302
303 if (_pipe(filedes, 8192, 0) < 0)
304 return -1;
305
306 parent = GetCurrentProcess();
307
308 if (!DuplicateHandle (parent, (HANDLE)_get_osfhandle(filedes[0]),
309 parent, &h[0], 0, FALSE, DUPLICATE_SAME_ACCESS)) {
310 close(filedes[0]);
311 close(filedes[1]);
312 return -1;
313 }
314 if (!DuplicateHandle (parent, (HANDLE)_get_osfhandle(filedes[1]),
315 parent, &h[1], 0, FALSE, DUPLICATE_SAME_ACCESS)) {
316 close(filedes[0]);
317 close(filedes[1]);
318 CloseHandle(h[0]);
319 return -1;
320 }
321 fd = _open_osfhandle((int)h[0], O_NOINHERIT);
322 if (fd < 0) {
323 close(filedes[0]);
324 close(filedes[1]);
325 CloseHandle(h[0]);
326 CloseHandle(h[1]);
327 return -1;
328 }
329 close(filedes[0]);
330 filedes[0] = fd;
331 fd = _open_osfhandle((int)h[1], O_NOINHERIT);
332 if (fd < 0) {
333 close(filedes[0]);
334 close(filedes[1]);
335 CloseHandle(h[1]);
336 return -1;
337 }
338 close(filedes[1]);
339 filedes[1] = fd;
340 return 0;
341}
342
f4626df5
JS
343int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
344{
6ed807f8
JS
345 int i, pending;
346
d317851a
JS
347 if (timeout >= 0) {
348 if (nfds == 0) {
349 Sleep(timeout);
350 return 0;
351 }
6ed807f8 352 return errno = EINVAL, error("poll timeout not supported");
d317851a 353 }
6ed807f8
JS
354
355 /* When there is only one fd to wait for, then we pretend that
356 * input is available and let the actual wait happen when the
357 * caller invokes read().
358 */
359 if (nfds == 1) {
360 if (!(ufds[0].events & POLLIN))
361 return errno = EINVAL, error("POLLIN not set");
362 ufds[0].revents = POLLIN;
363 return 0;
364 }
365
366repeat:
367 pending = 0;
368 for (i = 0; i < nfds; i++) {
369 DWORD avail = 0;
370 HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
371 if (h == INVALID_HANDLE_VALUE)
372 return -1; /* errno was set */
373
374 if (!(ufds[i].events & POLLIN))
375 return errno = EINVAL, error("POLLIN not set");
376
377 /* this emulation works only for pipes */
378 if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
379 int err = GetLastError();
380 if (err == ERROR_BROKEN_PIPE) {
381 ufds[i].revents = POLLHUP;
382 pending++;
383 } else {
384 errno = EINVAL;
385 return error("PeekNamedPipe failed,"
386 " GetLastError: %u", err);
387 }
388 } else if (avail) {
389 ufds[i].revents = POLLIN;
390 pending++;
391 } else
392 ufds[i].revents = 0;
393 }
394 if (!pending) {
395 /* The only times that we spin here is when the process
396 * that is connected through the pipes is waiting for
397 * its own input data to become available. But since
398 * the process (pack-objects) is itself CPU intensive,
399 * it will happily pick up the time slice that we are
3ea3c215 400 * relinquishing here.
6ed807f8
JS
401 */
402 Sleep(0);
403 goto repeat;
404 }
405 return 0;
f4626df5
JS
406}
407
408struct tm *gmtime_r(const time_t *timep, struct tm *result)
409{
410 /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
411 memcpy(result, gmtime(timep), sizeof(struct tm));
412 return result;
413}
414
415struct tm *localtime_r(const time_t *timep, struct tm *result)
416{
417 /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
418 memcpy(result, localtime(timep), sizeof(struct tm));
419 return result;
420}
421
25fe217b
JS
422#undef getcwd
423char *mingw_getcwd(char *pointer, int len)
424{
425 int i;
426 char *ret = getcwd(pointer, len);
427 if (!ret)
428 return ret;
429 for (i = 0; pointer[i]; i++)
430 if (pointer[i] == '\\')
431 pointer[i] = '/';
432 return ret;
433}
434
6fd6aec4
JS
435#undef getenv
436char *mingw_getenv(const char *name)
437{
438 char *result = getenv(name);
439 if (!result && !strcmp(name, "TMPDIR")) {
440 /* on Windows it is TMP and TEMP */
441 result = getenv("TMP");
442 if (!result)
443 result = getenv("TEMP");
444 }
445 return result;
446}
447
7e5d7768
JS
448/*
449 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
450 * (Parsing C++ Command-Line Arguments)
451 */
452static const char *quote_arg(const char *arg)
453{
454 /* count chars to quote */
455 int len = 0, n = 0;
456 int force_quotes = 0;
457 char *q, *d;
458 const char *p = arg;
459 if (!*p) force_quotes = 1;
460 while (*p) {
3aea1a5a 461 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
7e5d7768
JS
462 force_quotes = 1;
463 else if (*p == '"')
464 n++;
465 else if (*p == '\\') {
466 int count = 0;
467 while (*p == '\\') {
468 count++;
469 p++;
470 len++;
471 }
472 if (*p == '"')
473 n += count*2 + 1;
474 continue;
475 }
476 len++;
477 p++;
478 }
479 if (!force_quotes && n == 0)
480 return arg;
481
482 /* insert \ where necessary */
483 d = q = xmalloc(len+n+3);
484 *d++ = '"';
485 while (*arg) {
486 if (*arg == '"')
487 *d++ = '\\';
488 else if (*arg == '\\') {
489 int count = 0;
490 while (*arg == '\\') {
491 count++;
492 *d++ = *arg++;
493 }
494 if (*arg == '"') {
495 while (count-- > 0)
496 *d++ = '\\';
497 *d++ = '\\';
498 }
499 }
500 *d++ = *arg++;
501 }
502 *d++ = '"';
503 *d++ = 0;
504 return q;
505}
506
f1a4dfb8
JS
507static const char *parse_interpreter(const char *cmd)
508{
509 static char buf[100];
510 char *p, *opt;
511 int n, fd;
512
513 /* don't even try a .exe */
514 n = strlen(cmd);
515 if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
516 return NULL;
517
518 fd = open(cmd, O_RDONLY);
519 if (fd < 0)
520 return NULL;
521 n = read(fd, buf, sizeof(buf)-1);
522 close(fd);
523 if (n < 4) /* at least '#!/x' and not error */
524 return NULL;
525
526 if (buf[0] != '#' || buf[1] != '!')
527 return NULL;
528 buf[n] = '\0';
bedc4279
PH
529 p = buf + strcspn(buf, "\r\n");
530 if (!*p)
f1a4dfb8
JS
531 return NULL;
532
533 *p = '\0';
534 if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
535 return NULL;
536 /* strip options */
537 if ((opt = strchr(p+1, ' ')))
538 *opt = '\0';
539 return p+1;
540}
541
542/*
543 * Splits the PATH into parts.
544 */
545static char **get_path_split(void)
546{
547 char *p, **path, *envpath = getenv("PATH");
548 int i, n = 0;
549
550 if (!envpath || !*envpath)
551 return NULL;
552
553 envpath = xstrdup(envpath);
554 p = envpath;
555 while (p) {
556 char *dir = p;
557 p = strchr(p, ';');
558 if (p) *p++ = '\0';
559 if (*dir) { /* not earlier, catches series of ; */
560 ++n;
561 }
562 }
563 if (!n)
564 return NULL;
565
4b25d091 566 path = xmalloc((n+1)*sizeof(char *));
f1a4dfb8
JS
567 p = envpath;
568 i = 0;
569 do {
570 if (*p)
571 path[i++] = xstrdup(p);
572 p = p+strlen(p)+1;
573 } while (i < n);
574 path[i] = NULL;
575
576 free(envpath);
577
578 return path;
579}
580
581static void free_path_split(char **path)
582{
583 if (!path)
584 return;
585
586 char **p = path;
587 while (*p)
588 free(*p++);
589 free(path);
590}
591
592/*
593 * exe_only means that we only want to detect .exe files, but not scripts
594 * (which do not have an extension)
595 */
596static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
597{
598 char path[MAX_PATH];
599 snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
600
601 if (!isexe && access(path, F_OK) == 0)
602 return xstrdup(path);
603 path[strlen(path)-4] = '\0';
604 if ((!exe_only || isexe) && access(path, F_OK) == 0)
fe77b695
ER
605 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
606 return xstrdup(path);
f1a4dfb8
JS
607 return NULL;
608}
609
610/*
611 * Determines the absolute path of cmd using the the split path in path.
612 * If cmd contains a slash or backslash, no lookup is performed.
613 */
614static char *path_lookup(const char *cmd, char **path, int exe_only)
615{
616 char *prog = NULL;
617 int len = strlen(cmd);
618 int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
619
620 if (strchr(cmd, '/') || strchr(cmd, '\\'))
621 prog = xstrdup(cmd);
622
623 while (!prog && *path)
624 prog = lookup_prog(*path++, cmd, isexe, exe_only);
625
626 return prog;
627}
628
7e5d7768
JS
629static int env_compare(const void *a, const void *b)
630{
631 char *const *ea = a;
632 char *const *eb = b;
633 return strcasecmp(*ea, *eb);
634}
635
636static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
637 int prepend_cmd)
638{
639 STARTUPINFO si;
640 PROCESS_INFORMATION pi;
641 struct strbuf envblk, args;
642 unsigned flags;
643 BOOL ret;
644
645 /* Determine whether or not we are associated to a console */
646 HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
647 FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
648 FILE_ATTRIBUTE_NORMAL, NULL);
649 if (cons == INVALID_HANDLE_VALUE) {
650 /* There is no console associated with this process.
651 * Since the child is a console process, Windows
652 * would normally create a console window. But
653 * since we'll be redirecting std streams, we do
654 * not need the console.
19fb896f
AG
655 * It is necessary to use DETACHED_PROCESS
656 * instead of CREATE_NO_WINDOW to make ssh
657 * recognize that it has no console.
7e5d7768 658 */
19fb896f 659 flags = DETACHED_PROCESS;
7e5d7768
JS
660 } else {
661 /* There is already a console. If we specified
19fb896f 662 * DETACHED_PROCESS here, too, Windows would
7e5d7768 663 * disassociate the child from the console.
19fb896f 664 * The same is true for CREATE_NO_WINDOW.
7e5d7768
JS
665 * Go figure!
666 */
667 flags = 0;
668 CloseHandle(cons);
669 }
670 memset(&si, 0, sizeof(si));
671 si.cb = sizeof(si);
672 si.dwFlags = STARTF_USESTDHANDLES;
673 si.hStdInput = (HANDLE) _get_osfhandle(0);
674 si.hStdOutput = (HANDLE) _get_osfhandle(1);
675 si.hStdError = (HANDLE) _get_osfhandle(2);
676
677 /* concatenate argv, quoting args as we go */
678 strbuf_init(&args, 0);
679 if (prepend_cmd) {
680 char *quoted = (char *)quote_arg(cmd);
681 strbuf_addstr(&args, quoted);
682 if (quoted != cmd)
683 free(quoted);
684 }
685 for (; *argv; argv++) {
686 char *quoted = (char *)quote_arg(*argv);
687 if (*args.buf)
688 strbuf_addch(&args, ' ');
689 strbuf_addstr(&args, quoted);
690 if (quoted != *argv)
691 free(quoted);
692 }
693
694 if (env) {
695 int count = 0;
696 char **e, **sorted_env;
697
698 for (e = env; *e; e++)
699 count++;
700
701 /* environment must be sorted */
702 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
703 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
704 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
705
706 strbuf_init(&envblk, 0);
707 for (e = sorted_env; *e; e++) {
708 strbuf_addstr(&envblk, *e);
709 strbuf_addch(&envblk, '\0');
710 }
711 free(sorted_env);
712 }
713
714 memset(&pi, 0, sizeof(pi));
715 ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
716 env ? envblk.buf : NULL, NULL, &si, &pi);
717
718 if (env)
719 strbuf_release(&envblk);
720 strbuf_release(&args);
721
722 if (!ret) {
723 errno = ENOENT;
724 return -1;
725 }
726 CloseHandle(pi.hThread);
727 return (pid_t)pi.hProcess;
728}
729
730pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env)
731{
732 pid_t pid;
733 char **path = get_path_split();
734 char *prog = path_lookup(cmd, path, 0);
735
736 if (!prog) {
737 errno = ENOENT;
738 pid = -1;
739 }
740 else {
741 const char *interpr = parse_interpreter(prog);
742
743 if (interpr) {
744 const char *argv0 = argv[0];
745 char *iprog = path_lookup(interpr, path, 1);
746 argv[0] = prog;
747 if (!iprog) {
748 errno = ENOENT;
749 pid = -1;
750 }
751 else {
752 pid = mingw_spawnve(iprog, argv, env, 1);
753 free(iprog);
754 }
755 argv[0] = argv0;
756 }
757 else
758 pid = mingw_spawnve(prog, argv, env, 0);
759 free(prog);
760 }
761 free_path_split(path);
762 return pid;
763}
764
f1a4dfb8
JS
765static int try_shell_exec(const char *cmd, char *const *argv, char **env)
766{
767 const char *interpr = parse_interpreter(cmd);
768 char **path;
769 char *prog;
770 int pid = 0;
771
772 if (!interpr)
773 return 0;
774 path = get_path_split();
775 prog = path_lookup(interpr, path, 1);
776 if (prog) {
777 int argc = 0;
778 const char **argv2;
779 while (argv[argc]) argc++;
7e5d7768
JS
780 argv2 = xmalloc(sizeof(*argv) * (argc+1));
781 argv2[0] = (char *)cmd; /* full path to the script file */
782 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
783 pid = mingw_spawnve(prog, argv2, env, 1);
f1a4dfb8
JS
784 if (pid >= 0) {
785 int status;
786 if (waitpid(pid, &status, 0) < 0)
787 status = 255;
788 exit(status);
789 }
790 pid = 1; /* indicate that we tried but failed */
791 free(prog);
792 free(argv2);
793 }
794 free_path_split(path);
795 return pid;
796}
797
798static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
799{
800 /* check if git_command is a shell script */
801 if (!try_shell_exec(cmd, argv, (char **)env)) {
802 int pid, status;
803
7e5d7768 804 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
f1a4dfb8
JS
805 if (pid < 0)
806 return;
807 if (waitpid(pid, &status, 0) < 0)
808 status = 255;
809 exit(status);
810 }
811}
812
813void mingw_execvp(const char *cmd, char *const *argv)
814{
815 char **path = get_path_split();
816 char *prog = path_lookup(cmd, path, 0);
817
818 if (prog) {
819 mingw_execve(prog, argv, environ);
820 free(prog);
821 } else
822 errno = ENOENT;
823
824 free_path_split(path);
825}
826
2affea41 827static char **copy_environ(void)
ba26f296
JS
828{
829 char **env;
830 int i = 0;
831 while (environ[i])
832 i++;
833 env = xmalloc((i+1)*sizeof(*env));
834 for (i = 0; environ[i]; i++)
835 env[i] = xstrdup(environ[i]);
836 env[i] = NULL;
837 return env;
838}
839
840void free_environ(char **env)
841{
842 int i;
843 for (i = 0; env[i]; i++)
844 free(env[i]);
845 free(env);
846}
847
848static int lookup_env(char **env, const char *name, size_t nmln)
849{
850 int i;
851
852 for (i = 0; env[i]; i++) {
853 if (0 == strncmp(env[i], name, nmln)
854 && '=' == env[i][nmln])
855 /* matches */
856 return i;
857 }
858 return -1;
859}
860
861/*
862 * If name contains '=', then sets the variable, otherwise it unsets it
863 */
2affea41 864static char **env_setenv(char **env, const char *name)
ba26f296
JS
865{
866 char *eq = strchrnul(name, '=');
867 int i = lookup_env(env, name, eq-name);
868
869 if (i < 0) {
870 if (*eq) {
871 for (i = 0; env[i]; i++)
872 ;
873 env = xrealloc(env, (i+2)*sizeof(*env));
874 env[i] = xstrdup(name);
875 env[i+1] = NULL;
876 }
877 }
878 else {
879 free(env[i]);
880 if (*eq)
881 env[i] = xstrdup(name);
882 else
883 for (; env[i]; i++)
884 env[i] = env[i+1];
885 }
886 return env;
887}
888
2affea41
JS
889/*
890 * Copies global environ and adjusts variables as specified by vars.
891 */
892char **make_augmented_environ(const char *const *vars)
893{
894 char **env = copy_environ();
895
896 while (*vars)
897 env = env_setenv(env, *vars++);
898 return env;
899}
900
746fb857
JS
901/* this is the first function to call into WS_32; initialize it */
902#undef gethostbyname
903struct hostent *mingw_gethostbyname(const char *host)
904{
905 WSADATA wsa;
906
907 if (WSAStartup(MAKEWORD(2,2), &wsa))
908 die("unable to initialize winsock subsystem, error %d",
909 WSAGetLastError());
910 atexit((void(*)(void)) WSACleanup);
911 return gethostbyname(host);
912}
913
914int mingw_socket(int domain, int type, int protocol)
915{
916 int sockfd;
917 SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
918 if (s == INVALID_SOCKET) {
919 /*
920 * WSAGetLastError() values are regular BSD error codes
921 * biased by WSABASEERR.
922 * However, strerror() does not know about networking
923 * specific errors, which are values beginning at 38 or so.
924 * Therefore, we choose to leave the biased error code
925 * in errno so that _if_ someone looks up the code somewhere,
926 * then it is at least the number that are usually listed.
927 */
928 errno = WSAGetLastError();
929 return -1;
930 }
931 /* convert into a file descriptor */
932 if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
933 closesocket(s);
934 return error("unable to make a socket file descriptor: %s",
935 strerror(errno));
936 }
937 return sockfd;
938}
939
940#undef connect
941int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
942{
943 SOCKET s = (SOCKET)_get_osfhandle(sockfd);
944 return connect(s, sa, sz);
945}
946
ea9e98c3
JS
947#undef rename
948int mingw_rename(const char *pold, const char *pnew)
949{
6ac6f878
JS
950 DWORD attrs, gle;
951 int tries = 0;
952 static const int delay[] = { 0, 1, 10, 20, 40 };
632f7017 953
ea9e98c3
JS
954 /*
955 * Try native rename() first to get errno right.
956 * It is based on MoveFile(), which cannot overwrite existing files.
957 */
958 if (!rename(pold, pnew))
959 return 0;
960 if (errno != EEXIST)
961 return -1;
6ac6f878 962repeat:
ea9e98c3
JS
963 if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
964 return 0;
965 /* TODO: translate more errors */
6ac6f878
JS
966 gle = GetLastError();
967 if (gle == ERROR_ACCESS_DENIED &&
632f7017
JS
968 (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
969 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
ea9e98c3
JS
970 errno = EISDIR;
971 return -1;
972 }
632f7017
JS
973 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
974 SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
975 if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
976 return 0;
6ac6f878 977 gle = GetLastError();
632f7017
JS
978 /* revert file attributes on failure */
979 SetFileAttributes(pnew, attrs);
980 }
ea9e98c3 981 }
6ac6f878
JS
982 if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
983 /*
984 * We assume that some other process had the source or
985 * destination file open at the wrong moment and retry.
986 * In order to give the other process a higher chance to
987 * complete its operation, we give up our time slice now.
988 * If we have to retry again, we do sleep a bit.
989 */
990 Sleep(delay[tries]);
991 tries++;
992 goto repeat;
993 }
ea9e98c3
JS
994 errno = EACCES;
995 return -1;
996}
997
f4626df5
JS
998struct passwd *getpwuid(int uid)
999{
f7597aca 1000 static char user_name[100];
f4626df5 1001 static struct passwd p;
f7597aca
JS
1002
1003 DWORD len = sizeof(user_name);
1004 if (!GetUserName(user_name, &len))
1005 return NULL;
1006 p.pw_name = user_name;
1007 p.pw_gecos = "unknown";
1008 p.pw_dir = NULL;
f4626df5
JS
1009 return &p;
1010}
1011
6072fc31
JS
1012static HANDLE timer_event;
1013static HANDLE timer_thread;
1014static int timer_interval;
1015static int one_shot;
1016static sig_handler_t timer_fn = SIG_DFL;
1017
1018/* The timer works like this:
1019 * The thread, ticktack(), is a trivial routine that most of the time
1020 * only waits to receive the signal to terminate. The main thread tells
1021 * the thread to terminate by setting the timer_event to the signalled
1022 * state.
1023 * But ticktack() interrupts the wait state after the timer's interval
1024 * length to call the signal handler.
1025 */
1026
1027static __stdcall unsigned ticktack(void *dummy)
1028{
1029 while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1030 if (timer_fn == SIG_DFL)
1031 die("Alarm");
1032 if (timer_fn != SIG_IGN)
1033 timer_fn(SIGALRM);
1034 if (one_shot)
1035 break;
1036 }
1037 return 0;
1038}
1039
1040static int start_timer_thread(void)
1041{
1042 timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1043 if (timer_event) {
1044 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1045 if (!timer_thread )
1046 return errno = ENOMEM,
1047 error("cannot start timer thread");
1048 } else
1049 return errno = ENOMEM,
1050 error("cannot allocate resources for timer");
1051 return 0;
1052}
1053
1054static void stop_timer_thread(void)
1055{
1056 if (timer_event)
1057 SetEvent(timer_event); /* tell thread to terminate */
1058 if (timer_thread) {
1059 int rc = WaitForSingleObject(timer_thread, 1000);
1060 if (rc == WAIT_TIMEOUT)
1061 error("timer thread did not terminate timely");
1062 else if (rc != WAIT_OBJECT_0)
1063 error("waiting for timer thread failed: %lu",
1064 GetLastError());
1065 CloseHandle(timer_thread);
1066 }
1067 if (timer_event)
1068 CloseHandle(timer_event);
1069 timer_event = NULL;
1070 timer_thread = NULL;
1071}
1072
1073static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1074{
1075 return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1076}
1077
f4626df5
JS
1078int setitimer(int type, struct itimerval *in, struct itimerval *out)
1079{
6072fc31
JS
1080 static const struct timeval zero;
1081 static int atexit_done;
1082
1083 if (out != NULL)
1084 return errno = EINVAL,
1085 error("setitimer param 3 != NULL not implemented");
1086 if (!is_timeval_eq(&in->it_interval, &zero) &&
1087 !is_timeval_eq(&in->it_interval, &in->it_value))
1088 return errno = EINVAL,
1089 error("setitimer: it_interval must be zero or eq it_value");
1090
1091 if (timer_thread)
1092 stop_timer_thread();
1093
1094 if (is_timeval_eq(&in->it_value, &zero) &&
1095 is_timeval_eq(&in->it_interval, &zero))
1096 return 0;
1097
1098 timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1099 one_shot = is_timeval_eq(&in->it_interval, &zero);
1100 if (!atexit_done) {
1101 atexit(stop_timer_thread);
1102 atexit_done = 1;
1103 }
1104 return start_timer_thread();
f4626df5
JS
1105}
1106
1107int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1108{
6072fc31
JS
1109 if (sig != SIGALRM)
1110 return errno = EINVAL,
1111 error("sigaction only implemented for SIGALRM");
1112 if (out != NULL)
1113 return errno = EINVAL,
1114 error("sigaction: param 3 != NULL not implemented");
1115
1116 timer_fn = in->sa_handler;
1117 return 0;
1118}
1119
1120#undef signal
1121sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1122{
1123 if (sig != SIGALRM)
1124 return signal(sig, handler);
1125 sig_handler_t old = timer_fn;
1126 timer_fn = handler;
1127 return old;
f4626df5 1128}
4804aabc
SP
1129
1130static const char *make_backslash_path(const char *path)
1131{
1132 static char buf[PATH_MAX + 1];
1133 char *c;
1134
1135 if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1136 die("Too long path: %.*s", 60, path);
1137
1138 for (c = buf; *c; c++) {
1139 if (*c == '/')
1140 *c = '\\';
1141 }
1142 return buf;
1143}
1144
1145void mingw_open_html(const char *unixpath)
1146{
1147 const char *htmlpath = make_backslash_path(unixpath);
1148 printf("Launching default browser to display HTML ...\n");
1149 ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1150}
7be401e0
PK
1151
1152int link(const char *oldpath, const char *newpath)
1153{
1154 typedef BOOL WINAPI (*T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1155 static T create_hard_link = NULL;
1156 if (!create_hard_link) {
1157 create_hard_link = (T) GetProcAddress(
1158 GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1159 if (!create_hard_link)
1160 create_hard_link = (T)-1;
1161 }
1162 if (create_hard_link == (T)-1) {
1163 errno = ENOSYS;
1164 return -1;
1165 }
1166 if (!create_hard_link(newpath, oldpath, NULL)) {
1167 errno = err_win_to_posix(GetLastError());
1168 return -1;
1169 }
1170 return 0;
1171}
0dbbbc1e
JS
1172
1173char *getpass(const char *prompt)
1174{
1175 struct strbuf buf = STRBUF_INIT;
1176
1177 fputs(prompt, stderr);
1178 for (;;) {
1179 char c = _getch();
1180 if (c == '\r' || c == '\n')
1181 break;
1182 strbuf_addch(&buf, c);
1183 }
1184 fputs("\n", stderr);
1185 return strbuf_detach(&buf, NULL);
1186}
e16c60d9
MSO
1187
1188#ifndef NO_MINGW_REPLACE_READDIR
1189/* MinGW readdir implementation to avoid extra lstats for Git */
1190struct mingw_DIR
1191{
1192 struct _finddata_t dd_dta; /* disk transfer area for this dir */
1193 struct mingw_dirent dd_dir; /* Our own implementation, including d_type */
1194 long dd_handle; /* _findnext handle */
1195 int dd_stat; /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1196 char dd_name[1]; /* given path for dir with search pattern (struct is extended) */
1197};
1198
1199struct dirent *mingw_readdir(DIR *dir)
1200{
1201 WIN32_FIND_DATAA buf;
1202 HANDLE handle;
1203 struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1204
1205 if (!dir->dd_handle) {
1206 errno = EBADF; /* No set_errno for mingw */
1207 return NULL;
1208 }
1209
1210 if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1211 {
1212 handle = FindFirstFileA(dir->dd_name, &buf);
1213 DWORD lasterr = GetLastError();
1214 dir->dd_handle = (long)handle;
1215 if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1216 errno = err_win_to_posix(lasterr);
1217 return NULL;
1218 }
1219 } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1220 return NULL;
1221 } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1222 DWORD lasterr = GetLastError();
1223 FindClose((HANDLE)dir->dd_handle);
1224 dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1225 /* POSIX says you shouldn't set errno when readdir can't
1226 find any more files; so, if another error we leave it set. */
1227 if (lasterr != ERROR_NO_MORE_FILES)
1228 errno = err_win_to_posix(lasterr);
1229 return NULL;
1230 }
1231
1232 /* We get here if `buf' contains valid data. */
1233 strcpy(dir->dd_dir.d_name, buf.cFileName);
1234 ++dir->dd_stat;
1235
1236 /* Set file type, based on WIN32_FIND_DATA */
1237 mdir->dd_dir.d_type = 0;
1238 if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1239 mdir->dd_dir.d_type |= DT_DIR;
1240 else
1241 mdir->dd_dir.d_type |= DT_REG;
1242
1243 return (struct dirent*)&dir->dd_dir;
1244}
1245#endif // !NO_MINGW_REPLACE_READDIR