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36457566 LC |
1 | #include "config.h" |
2 | ||
3 | #include <iostream> | |
4 | #include <cerrno> | |
5 | #include <cstdio> | |
6 | #include <cstdlib> | |
7 | #include <sstream> | |
8 | #include <cstring> | |
9 | ||
10 | #include <sys/wait.h> | |
11 | #include <unistd.h> | |
12 | #include <fcntl.h> | |
13 | #include <limits.h> | |
14 | ||
15 | #ifdef __APPLE__ | |
16 | #include <sys/syscall.h> | |
17 | #endif | |
18 | ||
19 | #include "util.hh" | |
20 | ||
21 | ||
22 | extern char * * environ; | |
23 | ||
24 | ||
25 | namespace nix { | |
26 | ||
27 | ||
28 | BaseError::BaseError(const FormatOrString & fs, unsigned int status) | |
29 | : status(status) | |
30 | { | |
31 | err = fs.s; | |
32 | } | |
33 | ||
34 | ||
35 | BaseError & BaseError::addPrefix(const FormatOrString & fs) | |
36 | { | |
37 | prefix_ = fs.s + prefix_; | |
38 | return *this; | |
39 | } | |
40 | ||
41 | ||
42 | SysError::SysError(const FormatOrString & fs) | |
43 | : Error(format("%1%: %2%") % fs.s % strerror(errno)) | |
44 | , errNo(errno) | |
45 | { | |
46 | } | |
47 | ||
48 | ||
49 | string getEnv(const string & key, const string & def) | |
50 | { | |
51 | char * value = getenv(key.c_str()); | |
52 | return value ? string(value) : def; | |
53 | } | |
54 | ||
55 | ||
56 | Path absPath(Path path, Path dir) | |
57 | { | |
58 | if (path[0] != '/') { | |
59 | if (dir == "") { | |
60 | #ifdef __GNU__ | |
61 | /* GNU (aka. GNU/Hurd) doesn't have any limitation on path | |
62 | lengths and doesn't define `PATH_MAX'. */ | |
63 | char *buf = getcwd(NULL, 0); | |
64 | if (buf == NULL) | |
65 | #else | |
66 | char buf[PATH_MAX]; | |
67 | if (!getcwd(buf, sizeof(buf))) | |
68 | #endif | |
69 | throw SysError("cannot get cwd"); | |
70 | dir = buf; | |
71 | #ifdef __GNU__ | |
72 | free(buf); | |
73 | #endif | |
74 | } | |
75 | path = dir + "/" + path; | |
76 | } | |
77 | return canonPath(path); | |
78 | } | |
79 | ||
80 | ||
81 | Path canonPath(const Path & path, bool resolveSymlinks) | |
82 | { | |
83 | string s; | |
84 | ||
85 | if (path[0] != '/') | |
86 | throw Error(format("not an absolute path: `%1%'") % path); | |
87 | ||
88 | string::const_iterator i = path.begin(), end = path.end(); | |
89 | string temp; | |
90 | ||
91 | /* Count the number of times we follow a symlink and stop at some | |
92 | arbitrary (but high) limit to prevent infinite loops. */ | |
93 | unsigned int followCount = 0, maxFollow = 1024; | |
94 | ||
95 | while (1) { | |
96 | ||
97 | /* Skip slashes. */ | |
98 | while (i != end && *i == '/') i++; | |
99 | if (i == end) break; | |
100 | ||
101 | /* Ignore `.'. */ | |
102 | if (*i == '.' && (i + 1 == end || i[1] == '/')) | |
103 | i++; | |
104 | ||
105 | /* If `..', delete the last component. */ | |
106 | else if (*i == '.' && i + 1 < end && i[1] == '.' && | |
107 | (i + 2 == end || i[2] == '/')) | |
108 | { | |
109 | if (!s.empty()) s.erase(s.rfind('/')); | |
110 | i += 2; | |
111 | } | |
112 | ||
113 | /* Normal component; copy it. */ | |
114 | else { | |
115 | s += '/'; | |
116 | while (i != end && *i != '/') s += *i++; | |
117 | ||
118 | /* If s points to a symlink, resolve it and restart (since | |
119 | the symlink target might contain new symlinks). */ | |
120 | if (resolveSymlinks && isLink(s)) { | |
121 | if (++followCount >= maxFollow) | |
122 | throw Error(format("infinite symlink recursion in path `%1%'") % path); | |
123 | temp = absPath(readLink(s), dirOf(s)) | |
124 | + string(i, end); | |
125 | i = temp.begin(); /* restart */ | |
126 | end = temp.end(); | |
127 | s = ""; | |
128 | /* !!! potential for infinite loop */ | |
129 | } | |
130 | } | |
131 | } | |
132 | ||
133 | return s.empty() ? "/" : s; | |
134 | } | |
135 | ||
136 | ||
137 | Path dirOf(const Path & path) | |
138 | { | |
139 | Path::size_type pos = path.rfind('/'); | |
140 | if (pos == string::npos) | |
141 | throw Error(format("invalid file name `%1%'") % path); | |
142 | return pos == 0 ? "/" : Path(path, 0, pos); | |
143 | } | |
144 | ||
145 | ||
146 | string baseNameOf(const Path & path) | |
147 | { | |
148 | Path::size_type pos = path.rfind('/'); | |
149 | if (pos == string::npos) | |
150 | throw Error(format("invalid file name `%1%'") % path); | |
151 | return string(path, pos + 1); | |
152 | } | |
153 | ||
154 | ||
155 | bool isInDir(const Path & path, const Path & dir) | |
156 | { | |
157 | return path[0] == '/' | |
158 | && string(path, 0, dir.size()) == dir | |
159 | && path.size() >= dir.size() + 2 | |
160 | && path[dir.size()] == '/'; | |
161 | } | |
162 | ||
163 | ||
164 | struct stat lstat(const Path & path) | |
165 | { | |
166 | struct stat st; | |
167 | if (lstat(path.c_str(), &st)) | |
168 | throw SysError(format("getting status of `%1%'") % path); | |
169 | return st; | |
170 | } | |
171 | ||
172 | ||
173 | bool pathExists(const Path & path) | |
174 | { | |
175 | int res; | |
176 | struct stat st; | |
177 | res = lstat(path.c_str(), &st); | |
178 | if (!res) return true; | |
179 | if (errno != ENOENT && errno != ENOTDIR) | |
180 | throw SysError(format("getting status of %1%") % path); | |
181 | return false; | |
182 | } | |
183 | ||
184 | ||
185 | Path readLink(const Path & path) | |
186 | { | |
187 | checkInterrupt(); | |
188 | struct stat st = lstat(path); | |
189 | if (!S_ISLNK(st.st_mode)) | |
190 | throw Error(format("`%1%' is not a symlink") % path); | |
191 | char buf[st.st_size]; | |
192 | if (readlink(path.c_str(), buf, st.st_size) != st.st_size) | |
193 | throw SysError(format("reading symbolic link `%1%'") % path); | |
194 | return string(buf, st.st_size); | |
195 | } | |
196 | ||
197 | ||
198 | bool isLink(const Path & path) | |
199 | { | |
200 | struct stat st = lstat(path); | |
201 | return S_ISLNK(st.st_mode); | |
202 | } | |
203 | ||
204 | ||
205 | Strings readDirectory(const Path & path) | |
206 | { | |
207 | Strings names; | |
208 | ||
209 | AutoCloseDir dir = opendir(path.c_str()); | |
210 | if (!dir) throw SysError(format("opening directory `%1%'") % path); | |
211 | ||
212 | struct dirent * dirent; | |
213 | while (errno = 0, dirent = readdir(dir)) { /* sic */ | |
214 | checkInterrupt(); | |
215 | string name = dirent->d_name; | |
216 | if (name == "." || name == "..") continue; | |
217 | names.push_back(name); | |
218 | } | |
219 | if (errno) throw SysError(format("reading directory `%1%'") % path); | |
220 | ||
221 | return names; | |
222 | } | |
223 | ||
224 | ||
225 | string readFile(int fd) | |
226 | { | |
227 | struct stat st; | |
228 | if (fstat(fd, &st) == -1) | |
229 | throw SysError("statting file"); | |
230 | ||
231 | unsigned char * buf = new unsigned char[st.st_size]; | |
232 | AutoDeleteArray<unsigned char> d(buf); | |
233 | readFull(fd, buf, st.st_size); | |
234 | ||
235 | return string((char *) buf, st.st_size); | |
236 | } | |
237 | ||
238 | ||
239 | string readFile(const Path & path, bool drain) | |
240 | { | |
241 | AutoCloseFD fd = open(path.c_str(), O_RDONLY); | |
242 | if (fd == -1) | |
243 | throw SysError(format("opening file `%1%'") % path); | |
244 | return drain ? drainFD(fd) : readFile(fd); | |
245 | } | |
246 | ||
247 | ||
248 | void writeFile(const Path & path, const string & s) | |
249 | { | |
250 | AutoCloseFD fd = open(path.c_str(), O_WRONLY | O_TRUNC | O_CREAT, 0666); | |
251 | if (fd == -1) | |
252 | throw SysError(format("opening file `%1%'") % path); | |
253 | writeFull(fd, (unsigned char *) s.data(), s.size()); | |
254 | } | |
255 | ||
256 | ||
257 | string readLine(int fd) | |
258 | { | |
259 | string s; | |
260 | while (1) { | |
261 | checkInterrupt(); | |
262 | char ch; | |
263 | ssize_t rd = read(fd, &ch, 1); | |
264 | if (rd == -1) { | |
265 | if (errno != EINTR) | |
266 | throw SysError("reading a line"); | |
267 | } else if (rd == 0) | |
268 | throw EndOfFile("unexpected EOF reading a line"); | |
269 | else { | |
270 | if (ch == '\n') return s; | |
271 | s += ch; | |
272 | } | |
273 | } | |
274 | } | |
275 | ||
276 | ||
277 | void writeLine(int fd, string s) | |
278 | { | |
279 | s += '\n'; | |
280 | writeFull(fd, (const unsigned char *) s.data(), s.size()); | |
281 | } | |
282 | ||
283 | ||
284 | static void _deletePath(const Path & path, unsigned long long & bytesFreed) | |
285 | { | |
286 | checkInterrupt(); | |
287 | ||
288 | printMsg(lvlVomit, format("%1%") % path); | |
289 | ||
290 | struct stat st = lstat(path); | |
291 | ||
292 | if (!S_ISDIR(st.st_mode) && st.st_nlink == 1) | |
293 | bytesFreed += st.st_blocks * 512; | |
294 | ||
295 | if (S_ISDIR(st.st_mode)) { | |
296 | Strings names = readDirectory(path); | |
297 | ||
298 | /* Make the directory writable. */ | |
299 | if (!(st.st_mode & S_IWUSR)) { | |
300 | if (chmod(path.c_str(), st.st_mode | S_IWUSR) == -1) | |
301 | throw SysError(format("making `%1%' writable") % path); | |
302 | } | |
303 | ||
304 | for (Strings::iterator i = names.begin(); i != names.end(); ++i) | |
305 | _deletePath(path + "/" + *i, bytesFreed); | |
306 | } | |
307 | ||
308 | if (remove(path.c_str()) == -1) | |
309 | throw SysError(format("cannot unlink `%1%'") % path); | |
310 | } | |
311 | ||
312 | ||
313 | void deletePath(const Path & path) | |
314 | { | |
315 | unsigned long long dummy; | |
316 | deletePath(path, dummy); | |
317 | } | |
318 | ||
319 | ||
320 | void deletePath(const Path & path, unsigned long long & bytesFreed) | |
321 | { | |
322 | startNest(nest, lvlDebug, | |
323 | format("recursively deleting path `%1%'") % path); | |
324 | bytesFreed = 0; | |
325 | _deletePath(path, bytesFreed); | |
326 | } | |
327 | ||
328 | ||
329 | static Path tempName(Path tmpRoot, const Path & prefix, bool includePid, | |
330 | int & counter) | |
331 | { | |
332 | tmpRoot = canonPath(tmpRoot.empty() ? getEnv("TMPDIR", "/tmp") : tmpRoot, true); | |
333 | if (includePid) | |
334 | return (format("%1%/%2%-%3%-%4%") % tmpRoot % prefix % getpid() % counter++).str(); | |
335 | else | |
336 | return (format("%1%/%2%-%3%") % tmpRoot % prefix % counter++).str(); | |
337 | } | |
338 | ||
339 | ||
340 | Path createTempDir(const Path & tmpRoot, const Path & prefix, | |
341 | bool includePid, bool useGlobalCounter, mode_t mode) | |
342 | { | |
343 | static int globalCounter = 0; | |
344 | int localCounter = 0; | |
345 | int & counter(useGlobalCounter ? globalCounter : localCounter); | |
346 | ||
347 | while (1) { | |
348 | checkInterrupt(); | |
349 | Path tmpDir = tempName(tmpRoot, prefix, includePid, counter); | |
350 | if (mkdir(tmpDir.c_str(), mode) == 0) { | |
351 | /* Explicitly set the group of the directory. This is to | |
352 | work around around problems caused by BSD's group | |
353 | ownership semantics (directories inherit the group of | |
354 | the parent). For instance, the group of /tmp on | |
355 | FreeBSD is "wheel", so all directories created in /tmp | |
356 | will be owned by "wheel"; but if the user is not in | |
357 | "wheel", then "tar" will fail to unpack archives that | |
358 | have the setgid bit set on directories. */ | |
359 | if (chown(tmpDir.c_str(), (uid_t) -1, getegid()) != 0) | |
360 | throw SysError(format("setting group of directory `%1%'") % tmpDir); | |
361 | return tmpDir; | |
362 | } | |
363 | if (errno != EEXIST) | |
364 | throw SysError(format("creating directory `%1%'") % tmpDir); | |
365 | } | |
366 | } | |
367 | ||
368 | ||
369 | Paths createDirs(const Path & path) | |
370 | { | |
371 | Paths created; | |
372 | if (path == "/") return created; | |
373 | ||
374 | struct stat st; | |
375 | if (lstat(path.c_str(), &st) == -1) { | |
376 | created = createDirs(dirOf(path)); | |
377 | if (mkdir(path.c_str(), 0777) == -1 && errno != EEXIST) | |
378 | throw SysError(format("creating directory `%1%'") % path); | |
379 | st = lstat(path); | |
380 | created.push_back(path); | |
381 | } | |
382 | ||
383 | if (!S_ISDIR(st.st_mode)) throw Error(format("`%1%' is not a directory") % path); | |
384 | ||
385 | return created; | |
386 | } | |
387 | ||
388 | ||
389 | void createSymlink(const Path & target, const Path & link) | |
390 | { | |
391 | if (symlink(target.c_str(), link.c_str())) | |
392 | throw SysError(format("creating symlink from `%1%' to `%2%'") % link % target); | |
393 | } | |
394 | ||
395 | ||
396 | LogType logType = ltPretty; | |
397 | Verbosity verbosity = lvlInfo; | |
398 | ||
399 | static int nestingLevel = 0; | |
400 | ||
401 | ||
402 | Nest::Nest() | |
403 | { | |
404 | nest = false; | |
405 | } | |
406 | ||
407 | ||
408 | Nest::~Nest() | |
409 | { | |
410 | close(); | |
411 | } | |
412 | ||
413 | ||
414 | static string escVerbosity(Verbosity level) | |
415 | { | |
416 | return int2String((int) level); | |
417 | } | |
418 | ||
419 | ||
420 | void Nest::open(Verbosity level, const FormatOrString & fs) | |
421 | { | |
422 | if (level <= verbosity) { | |
423 | if (logType == ltEscapes) | |
424 | std::cerr << "\033[" << escVerbosity(level) << "p" | |
425 | << fs.s << "\n"; | |
426 | else | |
427 | printMsg_(level, fs); | |
428 | nest = true; | |
429 | nestingLevel++; | |
430 | } | |
431 | } | |
432 | ||
433 | ||
434 | void Nest::close() | |
435 | { | |
436 | if (nest) { | |
437 | nestingLevel--; | |
438 | if (logType == ltEscapes) | |
439 | std::cerr << "\033[q"; | |
440 | nest = false; | |
441 | } | |
442 | } | |
443 | ||
444 | ||
445 | void printMsg_(Verbosity level, const FormatOrString & fs) | |
446 | { | |
447 | checkInterrupt(); | |
448 | if (level > verbosity) return; | |
449 | string prefix; | |
450 | if (logType == ltPretty) | |
451 | for (int i = 0; i < nestingLevel; i++) | |
452 | prefix += "| "; | |
453 | else if (logType == ltEscapes && level != lvlInfo) | |
454 | prefix = "\033[" + escVerbosity(level) + "s"; | |
455 | string s = (format("%1%%2%\n") % prefix % fs.s).str(); | |
456 | writeToStderr(s); | |
457 | } | |
458 | ||
459 | ||
460 | void warnOnce(bool & haveWarned, const FormatOrString & fs) | |
461 | { | |
462 | if (!haveWarned) { | |
463 | printMsg(lvlError, format("warning: %1%") % fs.s); | |
464 | haveWarned = true; | |
465 | } | |
466 | } | |
467 | ||
468 | ||
469 | void writeToStderr(const string & s) | |
470 | { | |
471 | try { | |
472 | _writeToStderr((const unsigned char *) s.data(), s.size()); | |
473 | } catch (SysError & e) { | |
474 | /* Ignore failing writes to stderr if we're in an exception | |
475 | handler, otherwise throw an exception. We need to ignore | |
476 | write errors in exception handlers to ensure that cleanup | |
477 | code runs to completion if the other side of stderr has | |
478 | been closed unexpectedly. */ | |
479 | if (!std::uncaught_exception()) throw; | |
480 | } | |
481 | } | |
482 | ||
483 | ||
484 | static void defaultWriteToStderr(const unsigned char * buf, size_t count) | |
485 | { | |
486 | writeFull(STDERR_FILENO, buf, count); | |
487 | } | |
488 | ||
489 | ||
490 | void (*_writeToStderr) (const unsigned char * buf, size_t count) = defaultWriteToStderr; | |
491 | ||
492 | ||
493 | void readFull(int fd, unsigned char * buf, size_t count) | |
494 | { | |
495 | while (count) { | |
496 | checkInterrupt(); | |
497 | ssize_t res = read(fd, (char *) buf, count); | |
498 | if (res == -1) { | |
499 | if (errno == EINTR) continue; | |
500 | throw SysError("reading from file"); | |
501 | } | |
502 | if (res == 0) throw EndOfFile("unexpected end-of-file"); | |
503 | count -= res; | |
504 | buf += res; | |
505 | } | |
506 | } | |
507 | ||
508 | ||
509 | void writeFull(int fd, const unsigned char * buf, size_t count) | |
510 | { | |
511 | while (count) { | |
512 | checkInterrupt(); | |
513 | ssize_t res = write(fd, (char *) buf, count); | |
514 | if (res == -1) { | |
515 | if (errno == EINTR) continue; | |
516 | throw SysError("writing to file"); | |
517 | } | |
518 | count -= res; | |
519 | buf += res; | |
520 | } | |
521 | } | |
522 | ||
523 | ||
524 | string drainFD(int fd) | |
525 | { | |
526 | string result; | |
527 | unsigned char buffer[4096]; | |
528 | while (1) { | |
529 | checkInterrupt(); | |
530 | ssize_t rd = read(fd, buffer, sizeof buffer); | |
531 | if (rd == -1) { | |
532 | if (errno != EINTR) | |
533 | throw SysError("reading from file"); | |
534 | } | |
535 | else if (rd == 0) break; | |
536 | else result.append((char *) buffer, rd); | |
537 | } | |
538 | return result; | |
539 | } | |
540 | ||
541 | ||
542 | ||
543 | ////////////////////////////////////////////////////////////////////// | |
544 | ||
545 | ||
546 | AutoDelete::AutoDelete(const string & p, bool recursive) : path(p) | |
547 | { | |
548 | del = true; | |
549 | this->recursive = recursive; | |
550 | } | |
551 | ||
552 | AutoDelete::~AutoDelete() | |
553 | { | |
554 | try { | |
555 | if (del) { | |
556 | if (recursive) | |
557 | deletePath(path); | |
558 | else { | |
559 | if (remove(path.c_str()) == -1) | |
560 | throw SysError(format("cannot unlink `%1%'") % path); | |
561 | } | |
562 | } | |
563 | } catch (...) { | |
564 | ignoreException(); | |
565 | } | |
566 | } | |
567 | ||
568 | void AutoDelete::cancel() | |
569 | { | |
570 | del = false; | |
571 | } | |
572 | ||
573 | ||
574 | ||
575 | ////////////////////////////////////////////////////////////////////// | |
576 | ||
577 | ||
578 | AutoCloseFD::AutoCloseFD() | |
579 | { | |
580 | fd = -1; | |
581 | } | |
582 | ||
583 | ||
584 | AutoCloseFD::AutoCloseFD(int fd) | |
585 | { | |
586 | this->fd = fd; | |
587 | } | |
588 | ||
589 | ||
590 | AutoCloseFD::AutoCloseFD(const AutoCloseFD & fd) | |
591 | { | |
592 | /* Copying an AutoCloseFD isn't allowed (who should get to close | |
593 | it?). But as an edge case, allow copying of closed | |
594 | AutoCloseFDs. This is necessary due to tiresome reasons | |
595 | involving copy constructor use on default object values in STL | |
596 | containers (like when you do `map[value]' where value isn't in | |
597 | the map yet). */ | |
598 | this->fd = fd.fd; | |
599 | if (this->fd != -1) abort(); | |
600 | } | |
601 | ||
602 | ||
603 | AutoCloseFD::~AutoCloseFD() | |
604 | { | |
605 | try { | |
606 | close(); | |
607 | } catch (...) { | |
608 | ignoreException(); | |
609 | } | |
610 | } | |
611 | ||
612 | ||
613 | void AutoCloseFD::operator =(int fd) | |
614 | { | |
615 | if (this->fd != fd) close(); | |
616 | this->fd = fd; | |
617 | } | |
618 | ||
619 | ||
620 | AutoCloseFD::operator int() const | |
621 | { | |
622 | return fd; | |
623 | } | |
624 | ||
625 | ||
626 | void AutoCloseFD::close() | |
627 | { | |
628 | if (fd != -1) { | |
629 | if (::close(fd) == -1) | |
630 | /* This should never happen. */ | |
631 | throw SysError(format("closing file descriptor %1%") % fd); | |
632 | fd = -1; | |
633 | } | |
634 | } | |
635 | ||
636 | ||
637 | bool AutoCloseFD::isOpen() | |
638 | { | |
639 | return fd != -1; | |
640 | } | |
641 | ||
642 | ||
643 | /* Pass responsibility for closing this fd to the caller. */ | |
644 | int AutoCloseFD::borrow() | |
645 | { | |
646 | int oldFD = fd; | |
647 | fd = -1; | |
648 | return oldFD; | |
649 | } | |
650 | ||
651 | ||
652 | void Pipe::create() | |
653 | { | |
654 | int fds[2]; | |
655 | if (pipe(fds) != 0) throw SysError("creating pipe"); | |
656 | readSide = fds[0]; | |
657 | writeSide = fds[1]; | |
658 | closeOnExec(readSide); | |
659 | closeOnExec(writeSide); | |
660 | } | |
661 | ||
662 | ||
663 | ||
664 | ////////////////////////////////////////////////////////////////////// | |
665 | ||
666 | ||
667 | AutoCloseDir::AutoCloseDir() | |
668 | { | |
669 | dir = 0; | |
670 | } | |
671 | ||
672 | ||
673 | AutoCloseDir::AutoCloseDir(DIR * dir) | |
674 | { | |
675 | this->dir = dir; | |
676 | } | |
677 | ||
678 | ||
679 | AutoCloseDir::~AutoCloseDir() | |
680 | { | |
681 | close(); | |
682 | } | |
683 | ||
684 | ||
685 | void AutoCloseDir::operator =(DIR * dir) | |
686 | { | |
687 | this->dir = dir; | |
688 | } | |
689 | ||
690 | ||
691 | AutoCloseDir::operator DIR *() | |
692 | { | |
693 | return dir; | |
694 | } | |
695 | ||
696 | ||
697 | void AutoCloseDir::close() | |
698 | { | |
699 | if (dir) { | |
700 | closedir(dir); | |
701 | dir = 0; | |
702 | } | |
703 | } | |
704 | ||
705 | ||
706 | ////////////////////////////////////////////////////////////////////// | |
707 | ||
708 | ||
709 | Pid::Pid() | |
710 | { | |
711 | pid = -1; | |
712 | separatePG = false; | |
713 | killSignal = SIGKILL; | |
714 | } | |
715 | ||
716 | ||
717 | Pid::~Pid() | |
718 | { | |
719 | kill(); | |
720 | } | |
721 | ||
722 | ||
723 | void Pid::operator =(pid_t pid) | |
724 | { | |
725 | if (this->pid != pid) kill(); | |
726 | this->pid = pid; | |
727 | killSignal = SIGKILL; // reset signal to default | |
728 | } | |
729 | ||
730 | ||
731 | Pid::operator pid_t() | |
732 | { | |
733 | return pid; | |
734 | } | |
735 | ||
736 | ||
737 | void Pid::kill() | |
738 | { | |
739 | if (pid == -1 || pid == 0) return; | |
740 | ||
741 | printMsg(lvlError, format("killing process %1%") % pid); | |
742 | ||
743 | /* Send the requested signal to the child. If it has its own | |
744 | process group, send the signal to every process in the child | |
745 | process group (which hopefully includes *all* its children). */ | |
746 | if (::kill(separatePG ? -pid : pid, killSignal) != 0) | |
747 | printMsg(lvlError, (SysError(format("killing process %1%") % pid).msg())); | |
748 | ||
749 | /* Wait until the child dies, disregarding the exit status. */ | |
750 | int status; | |
751 | while (waitpid(pid, &status, 0) == -1) { | |
752 | checkInterrupt(); | |
753 | if (errno != EINTR) { | |
754 | printMsg(lvlError, | |
755 | (SysError(format("waiting for process %1%") % pid).msg())); | |
756 | break; | |
757 | } | |
758 | } | |
759 | ||
760 | pid = -1; | |
761 | } | |
762 | ||
763 | ||
764 | int Pid::wait(bool block) | |
765 | { | |
766 | assert(pid != -1); | |
767 | while (1) { | |
768 | int status; | |
769 | int res = waitpid(pid, &status, block ? 0 : WNOHANG); | |
770 | if (res == pid) { | |
771 | pid = -1; | |
772 | return status; | |
773 | } | |
774 | if (res == 0 && !block) return -1; | |
775 | if (errno != EINTR) | |
776 | throw SysError("cannot get child exit status"); | |
777 | checkInterrupt(); | |
778 | } | |
779 | } | |
780 | ||
781 | ||
782 | void Pid::setSeparatePG(bool separatePG) | |
783 | { | |
784 | this->separatePG = separatePG; | |
785 | } | |
786 | ||
787 | ||
788 | void Pid::setKillSignal(int signal) | |
789 | { | |
790 | this->killSignal = signal; | |
791 | } | |
792 | ||
793 | ||
794 | void killUser(uid_t uid) | |
795 | { | |
796 | debug(format("killing all processes running under uid `%1%'") % uid); | |
797 | ||
798 | assert(uid != 0); /* just to be safe... */ | |
799 | ||
800 | /* The system call kill(-1, sig) sends the signal `sig' to all | |
801 | users to which the current process can send signals. So we | |
802 | fork a process, switch to uid, and send a mass kill. */ | |
803 | ||
804 | Pid pid; | |
805 | pid = fork(); | |
806 | switch (pid) { | |
807 | ||
808 | case -1: | |
809 | throw SysError("unable to fork"); | |
810 | ||
811 | case 0: | |
812 | try { /* child */ | |
813 | ||
814 | if (setuid(uid) == -1) | |
815 | throw SysError("setting uid"); | |
816 | ||
817 | while (true) { | |
818 | #ifdef __APPLE__ | |
819 | /* OSX's kill syscall takes a third parameter that, among other | |
820 | things, determines if kill(-1, signo) affects the calling | |
821 | process. In the OSX libc, it's set to true, which means | |
822 | "follow POSIX", which we don't want here | |
823 | */ | |
824 | if (syscall(SYS_kill, -1, SIGKILL, false) == 0) break; | |
825 | #else | |
826 | if (kill(-1, SIGKILL) == 0) break; | |
827 | #endif | |
828 | if (errno == ESRCH) break; /* no more processes */ | |
829 | if (errno != EINTR) | |
830 | throw SysError(format("cannot kill processes for uid `%1%'") % uid); | |
831 | } | |
832 | ||
833 | } catch (std::exception & e) { | |
834 | writeToStderr((format("killing processes belonging to uid `%1%': %2%\n") % uid % e.what()).str()); | |
835 | _exit(1); | |
836 | } | |
837 | _exit(0); | |
838 | } | |
839 | ||
840 | /* parent */ | |
841 | int status = pid.wait(true); | |
842 | if (status != 0) | |
843 | throw Error(format("cannot kill processes for uid `%1%': %2%") % uid % statusToString(status)); | |
844 | ||
845 | /* !!! We should really do some check to make sure that there are | |
846 | no processes left running under `uid', but there is no portable | |
847 | way to do so (I think). The most reliable way may be `ps -eo | |
848 | uid | grep -q $uid'. */ | |
849 | } | |
850 | ||
851 | ||
852 | ////////////////////////////////////////////////////////////////////// | |
853 | ||
854 | ||
855 | string runProgram(Path program, bool searchPath, const Strings & args) | |
856 | { | |
857 | checkInterrupt(); | |
858 | ||
859 | std::vector<const char *> cargs; /* careful with c_str()! */ | |
860 | cargs.push_back(program.c_str()); | |
861 | for (Strings::const_iterator i = args.begin(); i != args.end(); ++i) | |
862 | cargs.push_back(i->c_str()); | |
863 | cargs.push_back(0); | |
864 | ||
865 | /* Create a pipe. */ | |
866 | Pipe pipe; | |
867 | pipe.create(); | |
868 | ||
869 | /* Fork. */ | |
870 | Pid pid; | |
871 | pid = maybeVfork(); | |
872 | ||
873 | switch (pid) { | |
874 | ||
875 | case -1: | |
876 | throw SysError("unable to fork"); | |
877 | ||
878 | case 0: /* child */ | |
879 | try { | |
880 | if (dup2(pipe.writeSide, STDOUT_FILENO) == -1) | |
881 | throw SysError("dupping stdout"); | |
882 | ||
883 | if (searchPath) | |
884 | execvp(program.c_str(), (char * *) &cargs[0]); | |
885 | else | |
886 | execv(program.c_str(), (char * *) &cargs[0]); | |
887 | throw SysError(format("executing `%1%'") % program); | |
888 | ||
889 | } catch (std::exception & e) { | |
890 | writeToStderr("error: " + string(e.what()) + "\n"); | |
891 | } | |
892 | _exit(1); | |
893 | } | |
894 | ||
895 | /* Parent. */ | |
896 | ||
897 | pipe.writeSide.close(); | |
898 | ||
899 | string result = drainFD(pipe.readSide); | |
900 | ||
901 | /* Wait for the child to finish. */ | |
902 | int status = pid.wait(true); | |
903 | if (!statusOk(status)) | |
904 | throw Error(format("program `%1%' %2%") | |
905 | % program % statusToString(status)); | |
906 | ||
907 | return result; | |
908 | } | |
909 | ||
910 | ||
911 | void closeMostFDs(const set<int> & exceptions) | |
912 | { | |
913 | int maxFD = 0; | |
914 | maxFD = sysconf(_SC_OPEN_MAX); | |
915 | for (int fd = 0; fd < maxFD; ++fd) | |
916 | if (fd != STDIN_FILENO && fd != STDOUT_FILENO && fd != STDERR_FILENO | |
917 | && exceptions.find(fd) == exceptions.end()) | |
918 | close(fd); /* ignore result */ | |
919 | } | |
920 | ||
921 | ||
922 | void closeOnExec(int fd) | |
923 | { | |
924 | int prev; | |
925 | if ((prev = fcntl(fd, F_GETFD, 0)) == -1 || | |
926 | fcntl(fd, F_SETFD, prev | FD_CLOEXEC) == -1) | |
927 | throw SysError("setting close-on-exec flag"); | |
928 | } | |
929 | ||
930 | ||
931 | #if HAVE_VFORK | |
932 | pid_t (*maybeVfork)() = vfork; | |
933 | #else | |
934 | pid_t (*maybeVfork)() = fork; | |
935 | #endif | |
936 | ||
937 | ||
938 | ////////////////////////////////////////////////////////////////////// | |
939 | ||
940 | ||
941 | volatile sig_atomic_t _isInterrupted = 0; | |
942 | ||
943 | void _interrupted() | |
944 | { | |
945 | /* Block user interrupts while an exception is being handled. | |
946 | Throwing an exception while another exception is being handled | |
947 | kills the program! */ | |
948 | if (!std::uncaught_exception()) { | |
949 | _isInterrupted = 0; | |
950 | throw Interrupted("interrupted by the user"); | |
951 | } | |
952 | } | |
953 | ||
954 | ||
955 | ||
956 | ////////////////////////////////////////////////////////////////////// | |
957 | ||
958 | ||
959 | template<class C> C tokenizeString(const string & s, const string & separators) | |
960 | { | |
961 | C result; | |
962 | string::size_type pos = s.find_first_not_of(separators, 0); | |
963 | while (pos != string::npos) { | |
964 | string::size_type end = s.find_first_of(separators, pos + 1); | |
965 | if (end == string::npos) end = s.size(); | |
966 | string token(s, pos, end - pos); | |
967 | result.insert(result.end(), token); | |
968 | pos = s.find_first_not_of(separators, end); | |
969 | } | |
970 | return result; | |
971 | } | |
972 | ||
973 | template Strings tokenizeString(const string & s, const string & separators); | |
974 | template StringSet tokenizeString(const string & s, const string & separators); | |
975 | template vector<string> tokenizeString(const string & s, const string & separators); | |
976 | ||
977 | ||
978 | string concatStringsSep(const string & sep, const Strings & ss) | |
979 | { | |
980 | string s; | |
981 | foreach (Strings::const_iterator, i, ss) { | |
982 | if (s.size() != 0) s += sep; | |
983 | s += *i; | |
984 | } | |
985 | return s; | |
986 | } | |
987 | ||
988 | ||
989 | string concatStringsSep(const string & sep, const StringSet & ss) | |
990 | { | |
991 | string s; | |
992 | foreach (StringSet::const_iterator, i, ss) { | |
993 | if (s.size() != 0) s += sep; | |
994 | s += *i; | |
995 | } | |
996 | return s; | |
997 | } | |
998 | ||
999 | ||
1000 | string chomp(const string & s) | |
1001 | { | |
1002 | size_t i = s.find_last_not_of(" \n\r\t"); | |
1003 | return i == string::npos ? "" : string(s, 0, i + 1); | |
1004 | } | |
1005 | ||
1006 | ||
1007 | string statusToString(int status) | |
1008 | { | |
1009 | if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { | |
1010 | if (WIFEXITED(status)) | |
1011 | return (format("failed with exit code %1%") % WEXITSTATUS(status)).str(); | |
1012 | else if (WIFSIGNALED(status)) { | |
1013 | int sig = WTERMSIG(status); | |
1014 | #if HAVE_STRSIGNAL | |
1015 | const char * description = strsignal(sig); | |
1016 | return (format("failed due to signal %1% (%2%)") % sig % description).str(); | |
1017 | #else | |
1018 | return (format("failed due to signal %1%") % sig).str(); | |
1019 | #endif | |
1020 | } | |
1021 | else | |
1022 | return "died abnormally"; | |
1023 | } else return "succeeded"; | |
1024 | } | |
1025 | ||
1026 | ||
1027 | bool statusOk(int status) | |
1028 | { | |
1029 | return WIFEXITED(status) && WEXITSTATUS(status) == 0; | |
1030 | } | |
1031 | ||
1032 | ||
1033 | bool hasSuffix(const string & s, const string & suffix) | |
1034 | { | |
1035 | return s.size() >= suffix.size() && string(s, s.size() - suffix.size()) == suffix; | |
1036 | } | |
1037 | ||
1038 | ||
1039 | void expect(std::istream & str, const string & s) | |
1040 | { | |
1041 | char s2[s.size()]; | |
1042 | str.read(s2, s.size()); | |
1043 | if (string(s2, s.size()) != s) | |
1044 | throw Error(format("expected string `%1%'") % s); | |
1045 | } | |
1046 | ||
1047 | ||
1048 | string parseString(std::istream & str) | |
1049 | { | |
1050 | string res; | |
1051 | expect(str, "\""); | |
1052 | int c; | |
1053 | while ((c = str.get()) != '"') | |
1054 | if (c == '\\') { | |
1055 | c = str.get(); | |
1056 | if (c == 'n') res += '\n'; | |
1057 | else if (c == 'r') res += '\r'; | |
1058 | else if (c == 't') res += '\t'; | |
1059 | else res += c; | |
1060 | } | |
1061 | else res += c; | |
1062 | return res; | |
1063 | } | |
1064 | ||
1065 | ||
1066 | bool endOfList(std::istream & str) | |
1067 | { | |
1068 | if (str.peek() == ',') { | |
1069 | str.get(); | |
1070 | return false; | |
1071 | } | |
1072 | if (str.peek() == ']') { | |
1073 | str.get(); | |
1074 | return true; | |
1075 | } | |
1076 | return false; | |
1077 | } | |
1078 | ||
1079 | ||
1080 | string decodeOctalEscaped(const string & s) | |
1081 | { | |
1082 | string r; | |
1083 | for (string::const_iterator i = s.begin(); i != s.end(); ) { | |
1084 | if (*i != '\\') { r += *i++; continue; } | |
1085 | unsigned char c = 0; | |
1086 | ++i; | |
1087 | while (i != s.end() && *i >= '0' && *i < '8') | |
1088 | c = c * 8 + (*i++ - '0'); | |
1089 | r += c; | |
1090 | } | |
1091 | return r; | |
1092 | } | |
1093 | ||
1094 | ||
1095 | void ignoreException() | |
1096 | { | |
1097 | try { | |
1098 | throw; | |
1099 | } catch (std::exception & e) { | |
1100 | printMsg(lvlError, format("error (ignored): %1%") % e.what()); | |
1101 | } | |
1102 | } | |
1103 | ||
1104 | ||
1105 | } |