1 /* $NetBSD: meta.c,v 1.200 2022/04/15 12:28:16 rillig Exp $ */ 2 3 /* 4 * Implement 'meta' mode. 5 * Adapted from John Birrell's patches to FreeBSD make. 6 * --sjg 7 */ 8 /* 9 * Copyright (c) 2009-2016, Juniper Networks, Inc. 10 * Portions Copyright (c) 2009, John Birrell. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 #if defined(USE_META) 34 35 #ifdef HAVE_CONFIG_H 36 # include "config.h" 37 #endif 38 #include <sys/stat.h> 39 #ifdef HAVE_LIBGEN_H 40 #include <libgen.h> 41 #elif !defined(HAVE_DIRNAME) 42 char * dirname(char *); 43 #endif 44 #include <errno.h> 45 #if !defined(HAVE_CONFIG_H) || defined(HAVE_ERR_H) 46 #include <err.h> 47 #endif 48 49 #include "make.h" 50 #include "dir.h" 51 #include "job.h" 52 53 #ifdef USE_FILEMON 54 #include "filemon/filemon.h" 55 #endif 56 57 static BuildMon Mybm; /* for compat */ 58 static StringList metaBailiwick = LST_INIT; /* our scope of control */ 59 static char *metaBailiwickStr; /* string storage for the list */ 60 static StringList metaIgnorePaths = LST_INIT; /* paths we deliberately ignore */ 61 static char *metaIgnorePathsStr; /* string storage for the list */ 62 63 #ifndef MAKE_META_IGNORE_PATHS 64 #define MAKE_META_IGNORE_PATHS ".MAKE.META.IGNORE_PATHS" 65 #endif 66 #ifndef MAKE_META_IGNORE_PATTERNS 67 #define MAKE_META_IGNORE_PATTERNS ".MAKE.META.IGNORE_PATTERNS" 68 #endif 69 #ifndef MAKE_META_IGNORE_FILTER 70 #define MAKE_META_IGNORE_FILTER ".MAKE.META.IGNORE_FILTER" 71 #endif 72 #ifndef MAKE_META_CMP_FILTER 73 #define MAKE_META_CMP_FILTER ".MAKE.META.CMP_FILTER" 74 #endif 75 76 bool useMeta = false; 77 static bool useFilemon = false; 78 static bool writeMeta = false; 79 static bool metaMissing = false; /* oodate if missing */ 80 static bool filemonMissing = false; /* oodate if missing */ 81 static bool metaEnv = false; /* don't save env unless asked */ 82 static bool metaVerbose = false; 83 static bool metaIgnoreCMDs = false; /* ignore CMDs in .meta files */ 84 static bool metaIgnorePatterns = false; /* do we need to do pattern matches */ 85 static bool metaIgnoreFilter = false; /* do we have more complex filtering? */ 86 static bool metaCmpFilter = false; /* do we have CMP_FILTER ? */ 87 static bool metaCurdirOk = false; /* write .meta in .CURDIR Ok? */ 88 static bool metaSilent = false; /* if we have a .meta be SILENT */ 89 90 extern bool forceJobs; 91 extern char **environ; 92 93 #define MAKE_META_PREFIX ".MAKE.META.PREFIX" 94 95 #ifndef N2U 96 # define N2U(n, u) (((n) + ((u) - 1)) / (u)) 97 #endif 98 #ifndef ROUNDUP 99 # define ROUNDUP(n, u) (N2U((n), (u)) * (u)) 100 #endif 101 102 #if !defined(HAVE_STRSEP) 103 # define strsep(s, d) stresep((s), (d), '\0') 104 #endif 105 #if !defined(HAVE_STRESEP) 106 char * stresep(char **, const char *, int); 107 #endif 108 109 /* 110 * Filemon is a kernel module which snoops certain syscalls. 111 * 112 * C chdir 113 * E exec 114 * F [v]fork 115 * L [sym]link 116 * M rename 117 * R read 118 * W write 119 * S stat 120 * 121 * See meta_oodate below - we mainly care about 'E' and 'R'. 122 * 123 * We can still use meta mode without filemon, but 124 * the benefits are more limited. 125 */ 126 #ifdef USE_FILEMON 127 128 /* 129 * Open the filemon device. 130 */ 131 static void 132 meta_open_filemon(BuildMon *pbm) 133 { 134 int dupfd; 135 136 pbm->mon_fd = -1; 137 pbm->filemon = NULL; 138 if (!useFilemon || pbm->mfp == NULL) 139 return; 140 141 pbm->filemon = filemon_open(); 142 if (pbm->filemon == NULL) { 143 useFilemon = false; 144 warn("Could not open filemon %s", filemon_path()); 145 return; 146 } 147 148 /* 149 * We use a file outside of '.' 150 * to avoid a FreeBSD kernel bug where unlink invalidates 151 * cwd causing getcwd to do a lot more work. 152 * We only care about the descriptor. 153 */ 154 if (!opts.compatMake) 155 pbm->mon_fd = Job_TempFile("filemon.XXXXXX", NULL, 0); 156 else 157 pbm->mon_fd = mkTempFile("filemon.XXXXXX", NULL, 0); 158 if ((dupfd = dup(pbm->mon_fd)) == -1) { 159 Punt("Could not dup filemon output: %s", strerror(errno)); 160 } 161 (void)fcntl(dupfd, F_SETFD, FD_CLOEXEC); 162 if (filemon_setfd(pbm->filemon, dupfd) == -1) { 163 Punt("Could not set filemon file descriptor: %s", strerror(errno)); 164 } 165 /* we don't need these once we exec */ 166 (void)fcntl(pbm->mon_fd, F_SETFD, FD_CLOEXEC); 167 } 168 169 /* 170 * Read the build monitor output file and write records to the target's 171 * metadata file. 172 */ 173 static int 174 filemon_read(FILE *mfp, int fd) 175 { 176 char buf[BUFSIZ]; 177 int error; 178 179 /* Check if we're not writing to a meta data file.*/ 180 if (mfp == NULL) { 181 if (fd >= 0) 182 close(fd); /* not interested */ 183 return 0; 184 } 185 /* rewind */ 186 if (lseek(fd, (off_t)0, SEEK_SET) < 0) { 187 error = errno; 188 warn("Could not rewind filemon"); 189 fprintf(mfp, "\n"); 190 } else { 191 ssize_t n; 192 193 error = 0; 194 fprintf(mfp, "\n-- filemon acquired metadata --\n"); 195 196 while ((n = read(fd, buf, sizeof buf)) > 0) { 197 if ((ssize_t)fwrite(buf, 1, (size_t)n, mfp) < n) 198 error = EIO; 199 } 200 } 201 if (fflush(mfp) != 0) 202 Punt("Cannot write filemon data to meta file: %s", 203 strerror(errno)); 204 if (close(fd) < 0) 205 error = errno; 206 return error; 207 } 208 #endif 209 210 /* 211 * when realpath() fails, 212 * we use this, to clean up ./ and ../ 213 */ 214 static void 215 eat_dots(char *buf) 216 { 217 char *p; 218 219 while ((p = strstr(buf, "/./")) != NULL) 220 memmove(p, p + 2, strlen(p + 2) + 1); 221 222 while ((p = strstr(buf, "/../")) != NULL) { 223 char *p2 = p + 3; 224 if (p > buf) { 225 do { 226 p--; 227 } while (p > buf && *p != '/'); 228 } 229 if (*p == '/') 230 memmove(p, p2, strlen(p2) + 1); 231 else 232 return; /* can't happen? */ 233 } 234 } 235 236 static char * 237 meta_name(char *mname, size_t mnamelen, 238 const char *dname, 239 const char *tname, 240 const char *cwd) 241 { 242 char buf[MAXPATHLEN]; 243 char *rp, *cp; 244 const char *tname_base; 245 char *tp; 246 char *dtp; 247 size_t ldname; 248 249 /* 250 * Weed out relative paths from the target file name. 251 * We have to be careful though since if target is a 252 * symlink, the result will be unstable. 253 * So we use realpath() just to get the dirname, and leave the 254 * basename as given to us. 255 */ 256 if ((tname_base = strrchr(tname, '/')) != NULL) { 257 if (cached_realpath(tname, buf) != NULL) { 258 if ((rp = strrchr(buf, '/')) != NULL) { 259 rp++; 260 tname_base++; 261 if (strcmp(tname_base, rp) != 0) 262 strlcpy(rp, tname_base, sizeof buf - (size_t)(rp - buf)); 263 } 264 tname = buf; 265 } else { 266 /* 267 * We likely have a directory which is about to be made. 268 * We pretend realpath() succeeded, to have a chance 269 * of generating the same meta file name that we will 270 * next time through. 271 */ 272 if (tname[0] == '/') { 273 strlcpy(buf, tname, sizeof buf); 274 } else { 275 snprintf(buf, sizeof buf, "%s/%s", cwd, tname); 276 } 277 eat_dots(buf); 278 tname = buf; 279 } 280 } 281 /* on some systems dirname may modify its arg */ 282 tp = bmake_strdup(tname); 283 dtp = dirname(tp); 284 if (strcmp(dname, dtp) == 0) 285 snprintf(mname, mnamelen, "%s.meta", tname); 286 else { 287 ldname = strlen(dname); 288 if (strncmp(dname, dtp, ldname) == 0 && dtp[ldname] == '/') 289 snprintf(mname, mnamelen, "%s/%s.meta", dname, &tname[ldname+1]); 290 else 291 snprintf(mname, mnamelen, "%s/%s.meta", dname, tname); 292 293 /* 294 * Replace path separators in the file name after the 295 * current object directory path. 296 */ 297 cp = mname + strlen(dname) + 1; 298 299 while (*cp != '\0') { 300 if (*cp == '/') 301 *cp = '_'; 302 cp++; 303 } 304 } 305 free(tp); 306 return mname; 307 } 308 309 /* 310 * Return true if running ${.MAKE} 311 * Bypassed if target is flagged .MAKE 312 */ 313 static bool 314 is_submake(const char *cmd, GNode *gn) 315 { 316 static const char *p_make = NULL; 317 static size_t p_len; 318 char *mp = NULL; 319 const char *cp2; 320 bool rc = false; 321 322 if (p_make == NULL) { 323 p_make = Var_Value(gn, ".MAKE").str; 324 p_len = strlen(p_make); 325 } 326 if (strchr(cmd, '$') != NULL) { 327 (void)Var_Subst(cmd, gn, VARE_WANTRES, &mp); 328 /* TODO: handle errors */ 329 cmd = mp; 330 } 331 cp2 = strstr(cmd, p_make); 332 if (cp2 != NULL) { 333 switch (cp2[p_len]) { 334 case '\0': 335 case ' ': 336 case '\t': 337 case '\n': 338 rc = true; 339 break; 340 } 341 if (cp2 > cmd && rc) { 342 switch (cp2[-1]) { 343 case ' ': 344 case '\t': 345 case '\n': 346 break; 347 default: 348 rc = false; /* no match */ 349 break; 350 } 351 } 352 } 353 free(mp); 354 return rc; 355 } 356 357 static bool 358 any_is_submake(GNode *gn) 359 { 360 StringListNode *ln; 361 362 for (ln = gn->commands.first; ln != NULL; ln = ln->next) 363 if (is_submake(ln->datum, gn)) 364 return true; 365 return false; 366 } 367 368 static void 369 printCMD(const char *ucmd, FILE *fp, GNode *gn) 370 { 371 FStr xcmd = FStr_InitRefer(ucmd); 372 373 Var_Expand(&xcmd, gn, VARE_WANTRES); 374 fprintf(fp, "CMD %s\n", xcmd.str); 375 FStr_Done(&xcmd); 376 } 377 378 static void 379 printCMDs(GNode *gn, FILE *fp) 380 { 381 StringListNode *ln; 382 383 for (ln = gn->commands.first; ln != NULL; ln = ln->next) 384 printCMD(ln->datum, fp, gn); 385 } 386 387 /* 388 * Certain node types never get a .meta file 389 */ 390 #define SKIP_META_TYPE(flag, str) do { \ 391 if ((gn->type & (flag))) { \ 392 if (verbose) \ 393 debug_printf("Skipping meta for %s: .%s\n", gn->name, str); \ 394 return false; \ 395 } \ 396 } while (false) 397 398 399 /* 400 * Do we need/want a .meta file ? 401 */ 402 static bool 403 meta_needed(GNode *gn, const char *dname, 404 char *objdir_realpath, bool verbose) 405 { 406 struct cached_stat cst; 407 408 if (verbose) 409 verbose = DEBUG(META); 410 411 /* This may be a phony node which we don't want meta data for... */ 412 /* Skip .meta for .BEGIN, .END, .ERROR etc as well. */ 413 /* Or it may be explicitly flagged as .NOMETA */ 414 SKIP_META_TYPE(OP_NOMETA, "NOMETA"); 415 /* Unless it is explicitly flagged as .META */ 416 if (!(gn->type & OP_META)) { 417 SKIP_META_TYPE(OP_PHONY, "PHONY"); 418 SKIP_META_TYPE(OP_SPECIAL, "SPECIAL"); 419 SKIP_META_TYPE(OP_MAKE, "MAKE"); 420 } 421 422 /* Check if there are no commands to execute. */ 423 if (Lst_IsEmpty(&gn->commands)) { 424 if (verbose) 425 debug_printf("Skipping meta for %s: no commands\n", gn->name); 426 return false; 427 } 428 if ((gn->type & (OP_META|OP_SUBMAKE)) == OP_SUBMAKE) { 429 /* OP_SUBMAKE is a bit too aggressive */ 430 if (any_is_submake(gn)) { 431 DEBUG1(META, "Skipping meta for %s: .SUBMAKE\n", gn->name); 432 return false; 433 } 434 } 435 436 /* The object directory may not exist. Check it.. */ 437 if (cached_stat(dname, &cst) != 0) { 438 if (verbose) 439 debug_printf("Skipping meta for %s: no .OBJDIR\n", gn->name); 440 return false; 441 } 442 443 /* make sure these are canonical */ 444 if (cached_realpath(dname, objdir_realpath) != NULL) 445 dname = objdir_realpath; 446 447 /* If we aren't in the object directory, don't create a meta file. */ 448 if (!metaCurdirOk && strcmp(curdir, dname) == 0) { 449 if (verbose) 450 debug_printf("Skipping meta for %s: .OBJDIR == .CURDIR\n", 451 gn->name); 452 return false; 453 } 454 return true; 455 } 456 457 458 static FILE * 459 meta_create(BuildMon *pbm, GNode *gn) 460 { 461 FILE *fp; 462 char buf[MAXPATHLEN]; 463 char objdir_realpath[MAXPATHLEN]; 464 char **ptr; 465 FStr dname; 466 const char *tname; 467 char *fname; 468 const char *cp; 469 470 fp = NULL; 471 472 dname = Var_Value(gn, ".OBJDIR"); 473 tname = GNode_VarTarget(gn); 474 475 /* if this succeeds objdir_realpath is realpath of dname */ 476 if (!meta_needed(gn, dname.str, objdir_realpath, true)) 477 goto out; 478 dname.str = objdir_realpath; 479 480 if (metaVerbose) { 481 char *mp; 482 483 /* Describe the target we are building */ 484 (void)Var_Subst("${" MAKE_META_PREFIX "}", gn, VARE_WANTRES, &mp); 485 /* TODO: handle errors */ 486 if (mp[0] != '\0') 487 fprintf(stdout, "%s\n", mp); 488 free(mp); 489 } 490 /* Get the basename of the target */ 491 cp = str_basename(tname); 492 493 fflush(stdout); 494 495 if (!writeMeta) 496 /* Don't create meta data. */ 497 goto out; 498 499 fname = meta_name(pbm->meta_fname, sizeof pbm->meta_fname, 500 dname.str, tname, objdir_realpath); 501 502 #ifdef DEBUG_META_MODE 503 DEBUG1(META, "meta_create: %s\n", fname); 504 #endif 505 506 if ((fp = fopen(fname, "w")) == NULL) 507 Punt("Could not open meta file '%s': %s", fname, strerror(errno)); 508 509 fprintf(fp, "# Meta data file %s\n", fname); 510 511 printCMDs(gn, fp); 512 513 fprintf(fp, "CWD %s\n", getcwd(buf, sizeof buf)); 514 fprintf(fp, "TARGET %s\n", tname); 515 cp = GNode_VarOodate(gn); 516 if (cp != NULL && *cp != '\0') { 517 fprintf(fp, "OODATE %s\n", cp); 518 } 519 if (metaEnv) { 520 for (ptr = environ; *ptr != NULL; ptr++) 521 fprintf(fp, "ENV %s\n", *ptr); 522 } 523 524 fprintf(fp, "-- command output --\n"); 525 if (fflush(fp) != 0) 526 Punt("Cannot write expanded command to meta file: %s", 527 strerror(errno)); 528 529 Global_Append(".MAKE.META.FILES", fname); 530 Global_Append(".MAKE.META.CREATED", fname); 531 532 gn->type |= OP_META; /* in case anyone wants to know */ 533 if (metaSilent) { 534 gn->type |= OP_SILENT; 535 } 536 out: 537 FStr_Done(&dname); 538 539 return fp; 540 } 541 542 static bool 543 boolValue(const char *s) 544 { 545 switch (*s) { 546 case '0': 547 case 'N': 548 case 'n': 549 case 'F': 550 case 'f': 551 return false; 552 } 553 return true; 554 } 555 556 /* 557 * Initialization we need before reading makefiles. 558 */ 559 void 560 meta_init(void) 561 { 562 #ifdef USE_FILEMON 563 /* this allows makefiles to test if we have filemon support */ 564 Global_Set(".MAKE.PATH_FILEMON", filemon_path()); 565 #endif 566 } 567 568 569 #define get_mode_bf(bf, token) \ 570 if ((cp = strstr(make_mode, token)) != NULL) \ 571 bf = boolValue(cp + sizeof (token) - 1) 572 573 /* 574 * Initialization we need after reading makefiles. 575 */ 576 void 577 meta_mode_init(const char *make_mode) 578 { 579 static bool once = false; 580 const char *cp; 581 582 useMeta = true; 583 useFilemon = true; 584 writeMeta = true; 585 586 if (make_mode != NULL) { 587 if (strstr(make_mode, "env") != NULL) 588 metaEnv = true; 589 if (strstr(make_mode, "verb") != NULL) 590 metaVerbose = true; 591 if (strstr(make_mode, "read") != NULL) 592 writeMeta = false; 593 if (strstr(make_mode, "nofilemon") != NULL) 594 useFilemon = false; 595 if (strstr(make_mode, "ignore-cmd") != NULL) 596 metaIgnoreCMDs = true; 597 if (useFilemon) 598 get_mode_bf(filemonMissing, "missing-filemon="); 599 get_mode_bf(metaCurdirOk, "curdirok="); 600 get_mode_bf(metaMissing, "missing-meta="); 601 get_mode_bf(metaSilent, "silent="); 602 } 603 if (metaVerbose && !Var_Exists(SCOPE_GLOBAL, MAKE_META_PREFIX)) { 604 /* 605 * The default value for MAKE_META_PREFIX 606 * prints the absolute path of the target. 607 * This works be cause :H will generate '.' if there is no / 608 * and :tA will resolve that to cwd. 609 */ 610 Global_Set(MAKE_META_PREFIX, 611 "Building ${.TARGET:H:tA}/${.TARGET:T}"); 612 } 613 if (once) 614 return; 615 once = true; 616 memset(&Mybm, 0, sizeof Mybm); 617 /* 618 * We consider ourselves master of all within ${.MAKE.META.BAILIWICK} 619 */ 620 (void)Var_Subst("${.MAKE.META.BAILIWICK:O:u:tA}", 621 SCOPE_GLOBAL, VARE_WANTRES, &metaBailiwickStr); 622 /* TODO: handle errors */ 623 str2Lst_Append(&metaBailiwick, metaBailiwickStr); 624 /* 625 * We ignore any paths that start with ${.MAKE.META.IGNORE_PATHS} 626 */ 627 Global_Append(MAKE_META_IGNORE_PATHS, 628 "/dev /etc /proc /tmp /var/run /var/tmp ${TMPDIR}"); 629 (void)Var_Subst("${" MAKE_META_IGNORE_PATHS ":O:u:tA}", 630 SCOPE_GLOBAL, VARE_WANTRES, &metaIgnorePathsStr); 631 /* TODO: handle errors */ 632 str2Lst_Append(&metaIgnorePaths, metaIgnorePathsStr); 633 634 /* 635 * We ignore any paths that match ${.MAKE.META.IGNORE_PATTERNS} 636 */ 637 metaIgnorePatterns = Var_Exists(SCOPE_GLOBAL, MAKE_META_IGNORE_PATTERNS); 638 metaIgnoreFilter = Var_Exists(SCOPE_GLOBAL, MAKE_META_IGNORE_FILTER); 639 metaCmpFilter = Var_Exists(SCOPE_GLOBAL, MAKE_META_CMP_FILTER); 640 } 641 642 /* 643 * In each case below we allow for job==NULL 644 */ 645 void 646 meta_job_start(Job *job, GNode *gn) 647 { 648 BuildMon *pbm; 649 650 if (job != NULL) { 651 pbm = &job->bm; 652 } else { 653 pbm = &Mybm; 654 } 655 pbm->mfp = meta_create(pbm, gn); 656 #ifdef USE_FILEMON_ONCE 657 /* compat mode we open the filemon dev once per command */ 658 if (job == NULL) 659 return; 660 #endif 661 #ifdef USE_FILEMON 662 if (pbm->mfp != NULL && useFilemon) { 663 meta_open_filemon(pbm); 664 } else { 665 pbm->mon_fd = -1; 666 pbm->filemon = NULL; 667 } 668 #endif 669 } 670 671 /* 672 * The child calls this before doing anything. 673 * It does not disturb our state. 674 */ 675 void 676 meta_job_child(Job *job MAKE_ATTR_UNUSED) 677 { 678 #ifdef USE_FILEMON 679 BuildMon *pbm; 680 681 if (job != NULL) { 682 pbm = &job->bm; 683 } else { 684 pbm = &Mybm; 685 } 686 if (pbm->mfp != NULL) { 687 close(fileno(pbm->mfp)); 688 if (useFilemon && pbm->filemon != NULL) { 689 pid_t pid; 690 691 pid = getpid(); 692 if (filemon_setpid_child(pbm->filemon, pid) == -1) { 693 Punt("Could not set filemon pid: %s", strerror(errno)); 694 } 695 } 696 } 697 #endif 698 } 699 700 void 701 meta_job_parent(Job *job MAKE_ATTR_UNUSED, pid_t pid MAKE_ATTR_UNUSED) 702 { 703 #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV) 704 BuildMon *pbm; 705 706 if (job != NULL) { 707 pbm = &job->bm; 708 } else { 709 pbm = &Mybm; 710 } 711 if (useFilemon && pbm->filemon != NULL) { 712 filemon_setpid_parent(pbm->filemon, pid); 713 } 714 #endif 715 } 716 717 int 718 meta_job_fd(Job *job MAKE_ATTR_UNUSED) 719 { 720 #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV) 721 BuildMon *pbm; 722 723 if (job != NULL) { 724 pbm = &job->bm; 725 } else { 726 pbm = &Mybm; 727 } 728 if (useFilemon && pbm->filemon != NULL) { 729 return filemon_readfd(pbm->filemon); 730 } 731 #endif 732 return -1; 733 } 734 735 int 736 meta_job_event(Job *job MAKE_ATTR_UNUSED) 737 { 738 #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV) 739 BuildMon *pbm; 740 741 if (job != NULL) { 742 pbm = &job->bm; 743 } else { 744 pbm = &Mybm; 745 } 746 if (useFilemon && pbm->filemon != NULL) { 747 return filemon_process(pbm->filemon); 748 } 749 #endif 750 return 0; 751 } 752 753 void 754 meta_job_error(Job *job, GNode *gn, bool ignerr, int status) 755 { 756 char cwd[MAXPATHLEN]; 757 BuildMon *pbm; 758 759 if (job != NULL) { 760 pbm = &job->bm; 761 if (gn == NULL) 762 gn = job->node; 763 } else { 764 pbm = &Mybm; 765 } 766 if (pbm->mfp != NULL) { 767 fprintf(pbm->mfp, "\n*** Error code %d%s\n", 768 status, ignerr ? "(ignored)" : ""); 769 } 770 if (gn != NULL) 771 Global_Set(".ERROR_TARGET", GNode_Path(gn)); 772 getcwd(cwd, sizeof cwd); 773 Global_Set(".ERROR_CWD", cwd); 774 if (pbm->meta_fname[0] != '\0') { 775 Global_Set(".ERROR_META_FILE", pbm->meta_fname); 776 } 777 meta_job_finish(job); 778 } 779 780 void 781 meta_job_output(Job *job, char *cp, const char *nl) 782 { 783 BuildMon *pbm; 784 785 if (job != NULL) { 786 pbm = &job->bm; 787 } else { 788 pbm = &Mybm; 789 } 790 if (pbm->mfp != NULL) { 791 if (metaVerbose) { 792 static char *meta_prefix = NULL; 793 static size_t meta_prefix_len; 794 795 if (meta_prefix == NULL) { 796 char *cp2; 797 798 (void)Var_Subst("${" MAKE_META_PREFIX "}", 799 SCOPE_GLOBAL, VARE_WANTRES, &meta_prefix); 800 /* TODO: handle errors */ 801 if ((cp2 = strchr(meta_prefix, '$')) != NULL) 802 meta_prefix_len = (size_t)(cp2 - meta_prefix); 803 else 804 meta_prefix_len = strlen(meta_prefix); 805 } 806 if (strncmp(cp, meta_prefix, meta_prefix_len) == 0) { 807 cp = strchr(cp + 1, '\n'); 808 if (cp == NULL) 809 return; 810 cp++; 811 } 812 } 813 fprintf(pbm->mfp, "%s%s", cp, nl); 814 } 815 } 816 817 int 818 meta_cmd_finish(void *pbmp) 819 { 820 int error = 0; 821 BuildMon *pbm = pbmp; 822 #ifdef USE_FILEMON 823 int x; 824 #endif 825 826 if (pbm == NULL) 827 pbm = &Mybm; 828 829 #ifdef USE_FILEMON 830 if (pbm->filemon != NULL) { 831 while (filemon_process(pbm->filemon) > 0) 832 continue; 833 if (filemon_close(pbm->filemon) == -1) { 834 error = errno; 835 Punt("filemon failed: %s", strerror(errno)); 836 } 837 x = filemon_read(pbm->mfp, pbm->mon_fd); 838 if (error == 0 && x != 0) 839 error = x; 840 pbm->mon_fd = -1; 841 pbm->filemon = NULL; 842 return error; 843 } 844 #endif 845 846 fprintf(pbm->mfp, "\n"); /* ensure end with newline */ 847 return error; 848 } 849 850 int 851 meta_job_finish(Job *job) 852 { 853 BuildMon *pbm; 854 int error = 0; 855 int x; 856 857 if (job != NULL) { 858 pbm = &job->bm; 859 } else { 860 pbm = &Mybm; 861 } 862 if (pbm->mfp != NULL) { 863 error = meta_cmd_finish(pbm); 864 x = fclose(pbm->mfp); 865 if (error == 0 && x != 0) 866 error = errno; 867 pbm->mfp = NULL; 868 pbm->meta_fname[0] = '\0'; 869 } 870 return error; 871 } 872 873 void 874 meta_finish(void) 875 { 876 Lst_Done(&metaBailiwick); 877 free(metaBailiwickStr); 878 Lst_Done(&metaIgnorePaths); 879 free(metaIgnorePathsStr); 880 } 881 882 /* 883 * Fetch a full line from fp - growing bufp if needed 884 * Return length in bufp. 885 */ 886 static int 887 fgetLine(char **bufp, size_t *szp, int o, FILE *fp) 888 { 889 char *buf = *bufp; 890 size_t bufsz = *szp; 891 struct stat fs; 892 int x; 893 894 if (fgets(&buf[o], (int)bufsz - o, fp) != NULL) { 895 check_newline: 896 x = o + (int)strlen(&buf[o]); 897 if (buf[x - 1] == '\n') 898 return x; 899 /* 900 * We need to grow the buffer. 901 * The meta file can give us a clue. 902 */ 903 if (fstat(fileno(fp), &fs) == 0) { 904 size_t newsz; 905 char *p; 906 907 newsz = ROUNDUP(((size_t)fs.st_size / 2), BUFSIZ); 908 if (newsz <= bufsz) 909 newsz = ROUNDUP((size_t)fs.st_size, BUFSIZ); 910 if (newsz <= bufsz) 911 return x; /* truncated */ 912 DEBUG2(META, "growing buffer %u -> %u\n", 913 (unsigned)bufsz, (unsigned)newsz); 914 p = bmake_realloc(buf, newsz); 915 *bufp = buf = p; 916 *szp = bufsz = newsz; 917 /* fetch the rest */ 918 if (fgets(&buf[x], (int)bufsz - x, fp) == NULL) 919 return x; /* truncated! */ 920 goto check_newline; 921 } 922 } 923 return 0; 924 } 925 926 static bool 927 prefix_match(const char *prefix, const char *path) 928 { 929 size_t n = strlen(prefix); 930 931 return strncmp(path, prefix, n) == 0; 932 } 933 934 static bool 935 has_any_prefix(const char *path, StringList *prefixes) 936 { 937 StringListNode *ln; 938 939 for (ln = prefixes->first; ln != NULL; ln = ln->next) 940 if (prefix_match(ln->datum, path)) 941 return true; 942 return false; 943 } 944 945 /* See if the path equals prefix or starts with "prefix/". */ 946 static bool 947 path_starts_with(const char *path, const char *prefix) 948 { 949 size_t n = strlen(prefix); 950 951 if (strncmp(path, prefix, n) != 0) 952 return false; 953 return path[n] == '\0' || path[n] == '/'; 954 } 955 956 static bool 957 meta_ignore(GNode *gn, const char *p) 958 { 959 char fname[MAXPATHLEN]; 960 961 if (p == NULL) 962 return true; 963 964 if (*p == '/') { 965 cached_realpath(p, fname); /* clean it up */ 966 if (has_any_prefix(fname, &metaIgnorePaths)) { 967 #ifdef DEBUG_META_MODE 968 DEBUG1(META, "meta_oodate: ignoring path: %s\n", p); 969 #endif 970 return true; 971 } 972 } 973 974 if (metaIgnorePatterns) { 975 const char *expr; 976 char *pm; 977 978 /* 979 * XXX: This variable is set on a target GNode but is not one of 980 * the usual local variables. It should be deleted afterwards. 981 * Ideally it would not be created in the first place, just like 982 * in a .for loop. 983 */ 984 Var_Set(gn, ".p.", p); 985 expr = "${" MAKE_META_IGNORE_PATTERNS ":@m@${.p.:M$m}@}"; 986 (void)Var_Subst(expr, gn, VARE_WANTRES, &pm); 987 /* TODO: handle errors */ 988 if (pm[0] != '\0') { 989 #ifdef DEBUG_META_MODE 990 DEBUG1(META, "meta_oodate: ignoring pattern: %s\n", p); 991 #endif 992 free(pm); 993 return true; 994 } 995 free(pm); 996 } 997 998 if (metaIgnoreFilter) { 999 char *fm; 1000 1001 /* skip if filter result is empty */ 1002 snprintf(fname, sizeof fname, 1003 "${%s:L:${%s:ts:}}", 1004 p, MAKE_META_IGNORE_FILTER); 1005 (void)Var_Subst(fname, gn, VARE_WANTRES, &fm); 1006 /* TODO: handle errors */ 1007 if (*fm == '\0') { 1008 #ifdef DEBUG_META_MODE 1009 DEBUG1(META, "meta_oodate: ignoring filtered: %s\n", p); 1010 #endif 1011 free(fm); 1012 return true; 1013 } 1014 free(fm); 1015 } 1016 return false; 1017 } 1018 1019 /* 1020 * When running with 'meta' functionality, a target can be out-of-date 1021 * if any of the references in its meta data file is more recent. 1022 * We have to track the latestdir on a per-process basis. 1023 */ 1024 #define LCWD_VNAME_FMT ".meta.%d.lcwd" 1025 #define LDIR_VNAME_FMT ".meta.%d.ldir" 1026 1027 /* 1028 * It is possible that a .meta file is corrupted, 1029 * if we detect this we want to reproduce it. 1030 * Setting oodate true will have that effect. 1031 */ 1032 #define CHECK_VALID_META(p) if (!(p != NULL && *p != '\0')) { \ 1033 warnx("%s: %u: malformed", fname, lineno); \ 1034 oodate = true; \ 1035 continue; \ 1036 } 1037 1038 #define DEQUOTE(p) if (*p == '\'') { \ 1039 char *ep; \ 1040 p++; \ 1041 if ((ep = strchr(p, '\'')) != NULL) \ 1042 *ep = '\0'; \ 1043 } 1044 1045 static void 1046 append_if_new(StringList *list, const char *str) 1047 { 1048 StringListNode *ln; 1049 1050 for (ln = list->first; ln != NULL; ln = ln->next) 1051 if (strcmp(ln->datum, str) == 0) 1052 return; 1053 Lst_Append(list, bmake_strdup(str)); 1054 } 1055 1056 /* A "reserved" variable to store the command to be filtered */ 1057 #define META_CMD_FILTER_VAR ".MAKE.cmd_filtered" 1058 1059 static char * 1060 meta_filter_cmd(GNode *gn, char *s) 1061 { 1062 Var_Set(gn, META_CMD_FILTER_VAR, s); 1063 Var_Subst("${" META_CMD_FILTER_VAR ":${" MAKE_META_CMP_FILTER ":ts:}}", gn, VARE_WANTRES, &s); 1064 return s; 1065 } 1066 1067 static int 1068 meta_cmd_cmp(GNode *gn, char *a, char *b, bool filter) 1069 { 1070 int rc; 1071 1072 rc = strcmp(a, b); 1073 if (rc == 0 || !filter) 1074 return rc; 1075 a = meta_filter_cmd(gn, a); 1076 b = meta_filter_cmd(gn, b); 1077 rc = strcmp(a, b); 1078 free(a); 1079 free(b); 1080 Var_Delete(gn, META_CMD_FILTER_VAR); 1081 return rc; 1082 } 1083 1084 bool 1085 meta_oodate(GNode *gn, bool oodate) 1086 { 1087 static char *tmpdir = NULL; 1088 static char cwd[MAXPATHLEN]; 1089 char lcwd_vname[64]; 1090 char ldir_vname[64]; 1091 char lcwd[MAXPATHLEN]; 1092 char latestdir[MAXPATHLEN]; 1093 char fname[MAXPATHLEN]; 1094 char fname1[MAXPATHLEN]; 1095 char fname2[MAXPATHLEN]; 1096 char fname3[MAXPATHLEN]; 1097 FStr dname; 1098 const char *tname; 1099 char *p; 1100 char *link_src; 1101 char *move_target; 1102 static size_t cwdlen = 0; 1103 static size_t tmplen = 0; 1104 FILE *fp; 1105 bool needOODATE = false; 1106 StringList missingFiles; 1107 bool have_filemon = false; 1108 bool cmp_filter; 1109 1110 if (oodate) 1111 return oodate; /* we're done */ 1112 1113 dname = Var_Value(gn, ".OBJDIR"); 1114 tname = GNode_VarTarget(gn); 1115 1116 /* if this succeeds fname3 is realpath of dname */ 1117 if (!meta_needed(gn, dname.str, fname3, false)) 1118 goto oodate_out; 1119 dname.str = fname3; 1120 1121 Lst_Init(&missingFiles); 1122 1123 /* 1124 * We need to check if the target is out-of-date. This includes 1125 * checking if the expanded command has changed. This in turn 1126 * requires that all variables are set in the same way that they 1127 * would be if the target needs to be re-built. 1128 */ 1129 GNode_SetLocalVars(gn); 1130 1131 meta_name(fname, sizeof fname, dname.str, tname, dname.str); 1132 1133 #ifdef DEBUG_META_MODE 1134 DEBUG1(META, "meta_oodate: %s\n", fname); 1135 #endif 1136 1137 if ((fp = fopen(fname, "r")) != NULL) { 1138 static char *buf = NULL; 1139 static size_t bufsz; 1140 unsigned lineno = 0; 1141 int lastpid = 0; 1142 int pid; 1143 int x; 1144 StringListNode *cmdNode; 1145 struct cached_stat cst; 1146 1147 if (buf == NULL) { 1148 bufsz = 8 * BUFSIZ; 1149 buf = bmake_malloc(bufsz); 1150 } 1151 1152 if (cwdlen == 0) { 1153 if (getcwd(cwd, sizeof cwd) == NULL) 1154 err(1, "Could not get current working directory"); 1155 cwdlen = strlen(cwd); 1156 } 1157 strlcpy(lcwd, cwd, sizeof lcwd); 1158 strlcpy(latestdir, cwd, sizeof latestdir); 1159 1160 if (tmpdir == NULL) { 1161 tmpdir = getTmpdir(); 1162 tmplen = strlen(tmpdir); 1163 } 1164 1165 /* we want to track all the .meta we read */ 1166 Global_Append(".MAKE.META.FILES", fname); 1167 1168 cmp_filter = metaCmpFilter || Var_Exists(gn, MAKE_META_CMP_FILTER); 1169 1170 cmdNode = gn->commands.first; 1171 while (!oodate && (x = fgetLine(&buf, &bufsz, 0, fp)) > 0) { 1172 lineno++; 1173 if (buf[x - 1] == '\n') 1174 buf[x - 1] = '\0'; 1175 else { 1176 warnx("%s: %u: line truncated at %u", fname, lineno, x); 1177 oodate = true; 1178 break; 1179 } 1180 link_src = NULL; 1181 move_target = NULL; 1182 /* Find the start of the build monitor section. */ 1183 if (!have_filemon) { 1184 if (strncmp(buf, "-- filemon", 10) == 0) { 1185 have_filemon = true; 1186 continue; 1187 } 1188 if (strncmp(buf, "# buildmon", 10) == 0) { 1189 have_filemon = true; 1190 continue; 1191 } 1192 } 1193 1194 /* Delimit the record type. */ 1195 p = buf; 1196 #ifdef DEBUG_META_MODE 1197 DEBUG3(META, "%s: %u: %s\n", fname, lineno, buf); 1198 #endif 1199 strsep(&p, " "); 1200 if (have_filemon) { 1201 /* 1202 * We are in the 'filemon' output section. 1203 * Each record from filemon follows the general form: 1204 * 1205 * <key> <pid> <data> 1206 * 1207 * Where: 1208 * <key> is a single letter, denoting the syscall. 1209 * <pid> is the process that made the syscall. 1210 * <data> is the arguments (of interest). 1211 */ 1212 switch(buf[0]) { 1213 case '#': /* comment */ 1214 case 'V': /* version */ 1215 break; 1216 default: 1217 /* 1218 * We need to track pathnames per-process. 1219 * 1220 * Each process run by make starts off in the 'CWD' 1221 * recorded in the .meta file, if it chdirs ('C') 1222 * elsewhere we need to track that - but only for 1223 * that process. If it forks ('F'), we initialize 1224 * the child to have the same cwd as its parent. 1225 * 1226 * We also need to track the 'latestdir' of 1227 * interest. This is usually the same as cwd, but 1228 * not if a process is reading directories. 1229 * 1230 * Each time we spot a different process ('pid') 1231 * we save the current value of 'latestdir' in a 1232 * variable qualified by 'lastpid', and 1233 * re-initialize 'latestdir' to any pre-saved 1234 * value for the current 'pid' and 'CWD' if none. 1235 */ 1236 CHECK_VALID_META(p); 1237 pid = atoi(p); 1238 if (pid > 0 && pid != lastpid) { 1239 FStr ldir; 1240 1241 if (lastpid > 0) { 1242 /* We need to remember these. */ 1243 Global_Set(lcwd_vname, lcwd); 1244 Global_Set(ldir_vname, latestdir); 1245 } 1246 snprintf(lcwd_vname, sizeof lcwd_vname, LCWD_VNAME_FMT, pid); 1247 snprintf(ldir_vname, sizeof ldir_vname, LDIR_VNAME_FMT, pid); 1248 lastpid = pid; 1249 ldir = Var_Value(SCOPE_GLOBAL, ldir_vname); 1250 if (ldir.str != NULL) { 1251 strlcpy(latestdir, ldir.str, sizeof latestdir); 1252 FStr_Done(&ldir); 1253 } 1254 ldir = Var_Value(SCOPE_GLOBAL, lcwd_vname); 1255 if (ldir.str != NULL) { 1256 strlcpy(lcwd, ldir.str, sizeof lcwd); 1257 FStr_Done(&ldir); 1258 } 1259 } 1260 /* Skip past the pid. */ 1261 if (strsep(&p, " ") == NULL) 1262 continue; 1263 #ifdef DEBUG_META_MODE 1264 if (DEBUG(META)) 1265 debug_printf("%s: %u: %d: %c: cwd=%s lcwd=%s ldir=%s\n", 1266 fname, lineno, 1267 pid, buf[0], cwd, lcwd, latestdir); 1268 #endif 1269 break; 1270 } 1271 1272 CHECK_VALID_META(p); 1273 1274 /* Process according to record type. */ 1275 switch (buf[0]) { 1276 case 'X': /* eXit */ 1277 Var_Delete(SCOPE_GLOBAL, lcwd_vname); 1278 Var_Delete(SCOPE_GLOBAL, ldir_vname); 1279 lastpid = 0; /* no need to save ldir_vname */ 1280 break; 1281 1282 case 'F': /* [v]Fork */ 1283 { 1284 char cldir[64]; 1285 int child; 1286 1287 child = atoi(p); 1288 if (child > 0) { 1289 snprintf(cldir, sizeof cldir, LCWD_VNAME_FMT, child); 1290 Global_Set(cldir, lcwd); 1291 snprintf(cldir, sizeof cldir, LDIR_VNAME_FMT, child); 1292 Global_Set(cldir, latestdir); 1293 #ifdef DEBUG_META_MODE 1294 if (DEBUG(META)) 1295 debug_printf( 1296 "%s: %u: %d: cwd=%s lcwd=%s ldir=%s\n", 1297 fname, lineno, 1298 child, cwd, lcwd, latestdir); 1299 #endif 1300 } 1301 } 1302 break; 1303 1304 case 'C': /* Chdir */ 1305 /* Update lcwd and latest directory. */ 1306 strlcpy(latestdir, p, sizeof latestdir); 1307 strlcpy(lcwd, p, sizeof lcwd); 1308 Global_Set(lcwd_vname, lcwd); 1309 Global_Set(ldir_vname, lcwd); 1310 #ifdef DEBUG_META_MODE 1311 DEBUG4(META, "%s: %u: cwd=%s ldir=%s\n", 1312 fname, lineno, cwd, lcwd); 1313 #endif 1314 break; 1315 1316 case 'M': /* renaMe */ 1317 /* 1318 * For 'M'oves we want to check 1319 * the src as for 'R'ead 1320 * and the target as for 'W'rite. 1321 */ 1322 { 1323 char *cp = p; /* save this for a second */ 1324 /* now get target */ 1325 if (strsep(&p, " ") == NULL) 1326 continue; 1327 CHECK_VALID_META(p); 1328 move_target = p; 1329 p = cp; 1330 } 1331 /* 'L' and 'M' put single quotes around the args */ 1332 DEQUOTE(p); 1333 DEQUOTE(move_target); 1334 /* FALLTHROUGH */ 1335 case 'D': /* unlink */ 1336 if (*p == '/') { 1337 /* remove any missingFiles entries that match p */ 1338 StringListNode *ln = missingFiles.first; 1339 while (ln != NULL) { 1340 StringListNode *next = ln->next; 1341 if (path_starts_with(ln->datum, p)) { 1342 free(ln->datum); 1343 Lst_Remove(&missingFiles, ln); 1344 } 1345 ln = next; 1346 } 1347 } 1348 if (buf[0] == 'M') { 1349 /* the target of the mv is a file 'W'ritten */ 1350 #ifdef DEBUG_META_MODE 1351 DEBUG2(META, "meta_oodate: M %s -> %s\n", 1352 p, move_target); 1353 #endif 1354 p = move_target; 1355 goto check_write; 1356 } 1357 break; 1358 case 'L': /* Link */ 1359 /* 1360 * For 'L'inks check 1361 * the src as for 'R'ead 1362 * and the target as for 'W'rite. 1363 */ 1364 link_src = p; 1365 /* now get target */ 1366 if (strsep(&p, " ") == NULL) 1367 continue; 1368 CHECK_VALID_META(p); 1369 /* 'L' and 'M' put single quotes around the args */ 1370 DEQUOTE(p); 1371 DEQUOTE(link_src); 1372 #ifdef DEBUG_META_MODE 1373 DEBUG2(META, "meta_oodate: L %s -> %s\n", link_src, p); 1374 #endif 1375 /* FALLTHROUGH */ 1376 case 'W': /* Write */ 1377 check_write: 1378 /* 1379 * If a file we generated within our bailiwick 1380 * but outside of .OBJDIR is missing, 1381 * we need to do it again. 1382 */ 1383 /* ignore non-absolute paths */ 1384 if (*p != '/') 1385 break; 1386 1387 if (Lst_IsEmpty(&metaBailiwick)) 1388 break; 1389 1390 /* ignore cwd - normal dependencies handle those */ 1391 if (strncmp(p, cwd, cwdlen) == 0) 1392 break; 1393 1394 if (!has_any_prefix(p, &metaBailiwick)) 1395 break; 1396 1397 /* tmpdir might be within */ 1398 if (tmplen > 0 && strncmp(p, tmpdir, tmplen) == 0) 1399 break; 1400 1401 /* ignore anything containing the string "tmp" */ 1402 /* XXX: The arguments to strstr must be swapped. */ 1403 if (strstr("tmp", p) != NULL) 1404 break; 1405 1406 if ((link_src != NULL && cached_lstat(p, &cst) < 0) || 1407 (link_src == NULL && cached_stat(p, &cst) < 0)) { 1408 if (!meta_ignore(gn, p)) 1409 append_if_new(&missingFiles, p); 1410 } 1411 break; 1412 check_link_src: 1413 p = link_src; 1414 link_src = NULL; 1415 #ifdef DEBUG_META_MODE 1416 DEBUG1(META, "meta_oodate: L src %s\n", p); 1417 #endif 1418 /* FALLTHROUGH */ 1419 case 'R': /* Read */ 1420 case 'E': /* Exec */ 1421 /* 1422 * Check for runtime files that can't 1423 * be part of the dependencies because 1424 * they are _expected_ to change. 1425 */ 1426 if (meta_ignore(gn, p)) 1427 break; 1428 1429 /* 1430 * The rest of the record is the file name. 1431 * Check if it's not an absolute path. 1432 */ 1433 { 1434 char *sdirs[4]; 1435 char **sdp; 1436 int sdx = 0; 1437 bool found = false; 1438 1439 if (*p == '/') { 1440 sdirs[sdx++] = p; /* done */ 1441 } else { 1442 if (strcmp(".", p) == 0) 1443 continue; /* no point */ 1444 1445 /* Check vs latestdir */ 1446 snprintf(fname1, sizeof fname1, "%s/%s", latestdir, p); 1447 sdirs[sdx++] = fname1; 1448 1449 if (strcmp(latestdir, lcwd) != 0) { 1450 /* Check vs lcwd */ 1451 snprintf(fname2, sizeof fname2, "%s/%s", lcwd, p); 1452 sdirs[sdx++] = fname2; 1453 } 1454 if (strcmp(lcwd, cwd) != 0) { 1455 /* Check vs cwd */ 1456 snprintf(fname3, sizeof fname3, "%s/%s", cwd, p); 1457 sdirs[sdx++] = fname3; 1458 } 1459 } 1460 sdirs[sdx++] = NULL; 1461 1462 for (sdp = sdirs; *sdp != NULL && !found; sdp++) { 1463 #ifdef DEBUG_META_MODE 1464 DEBUG3(META, "%s: %u: looking for: %s\n", 1465 fname, lineno, *sdp); 1466 #endif 1467 if (cached_stat(*sdp, &cst) == 0) { 1468 found = true; 1469 p = *sdp; 1470 } 1471 } 1472 if (found) { 1473 #ifdef DEBUG_META_MODE 1474 DEBUG3(META, "%s: %u: found: %s\n", 1475 fname, lineno, p); 1476 #endif 1477 if (!S_ISDIR(cst.cst_mode) && 1478 cst.cst_mtime > gn->mtime) { 1479 DEBUG3(META, "%s: %u: file '%s' is newer than the target...\n", 1480 fname, lineno, p); 1481 oodate = true; 1482 } else if (S_ISDIR(cst.cst_mode)) { 1483 /* Update the latest directory. */ 1484 cached_realpath(p, latestdir); 1485 } 1486 } else if (errno == ENOENT && *p == '/' && 1487 strncmp(p, cwd, cwdlen) != 0) { 1488 /* 1489 * A referenced file outside of CWD is missing. 1490 * We cannot catch every eventuality here... 1491 */ 1492 append_if_new(&missingFiles, p); 1493 } 1494 } 1495 if (buf[0] == 'E') { 1496 /* previous latestdir is no longer relevant */ 1497 strlcpy(latestdir, lcwd, sizeof latestdir); 1498 } 1499 break; 1500 default: 1501 break; 1502 } 1503 if (!oodate && buf[0] == 'L' && link_src != NULL) 1504 goto check_link_src; 1505 } else if (strcmp(buf, "CMD") == 0) { 1506 /* 1507 * Compare the current command with the one in the 1508 * meta data file. 1509 */ 1510 if (cmdNode == NULL) { 1511 DEBUG2(META, "%s: %u: there were more build commands in the meta data file than there are now...\n", 1512 fname, lineno); 1513 oodate = true; 1514 } else { 1515 const char *cp; 1516 char *cmd = cmdNode->datum; 1517 bool hasOODATE = false; 1518 1519 if (strstr(cmd, "$?") != NULL) 1520 hasOODATE = true; 1521 else if ((cp = strstr(cmd, ".OODATE")) != NULL) { 1522 /* check for $[{(].OODATE[:)}] */ 1523 if (cp > cmd + 2 && cp[-2] == '$') 1524 hasOODATE = true; 1525 } 1526 if (hasOODATE) { 1527 needOODATE = true; 1528 DEBUG2(META, "%s: %u: cannot compare command using .OODATE\n", 1529 fname, lineno); 1530 } 1531 (void)Var_Subst(cmd, gn, VARE_UNDEFERR, &cmd); 1532 /* TODO: handle errors */ 1533 1534 if ((cp = strchr(cmd, '\n')) != NULL) { 1535 int n; 1536 1537 /* 1538 * This command contains newlines, we need to 1539 * fetch more from the .meta file before we 1540 * attempt a comparison. 1541 */ 1542 /* first put the newline back at buf[x - 1] */ 1543 buf[x - 1] = '\n'; 1544 do { 1545 /* now fetch the next line */ 1546 if ((n = fgetLine(&buf, &bufsz, x, fp)) <= 0) 1547 break; 1548 x = n; 1549 lineno++; 1550 if (buf[x - 1] != '\n') { 1551 warnx("%s: %u: line truncated at %u", fname, lineno, x); 1552 break; 1553 } 1554 cp = strchr(cp + 1, '\n'); 1555 } while (cp != NULL); 1556 if (buf[x - 1] == '\n') 1557 buf[x - 1] = '\0'; 1558 } 1559 if (p != NULL && 1560 !hasOODATE && 1561 !(gn->type & OP_NOMETA_CMP) && 1562 (meta_cmd_cmp(gn, p, cmd, cmp_filter) != 0)) { 1563 DEBUG4(META, "%s: %u: a build command has changed\n%s\nvs\n%s\n", 1564 fname, lineno, p, cmd); 1565 if (!metaIgnoreCMDs) 1566 oodate = true; 1567 } 1568 free(cmd); 1569 cmdNode = cmdNode->next; 1570 } 1571 } else if (strcmp(buf, "CWD") == 0) { 1572 /* 1573 * Check if there are extra commands now 1574 * that weren't in the meta data file. 1575 */ 1576 if (!oodate && cmdNode != NULL) { 1577 DEBUG2(META, "%s: %u: there are extra build commands now that weren't in the meta data file\n", 1578 fname, lineno); 1579 oodate = true; 1580 } 1581 CHECK_VALID_META(p); 1582 if (strcmp(p, cwd) != 0) { 1583 DEBUG4(META, "%s: %u: the current working directory has changed from '%s' to '%s'\n", 1584 fname, lineno, p, curdir); 1585 oodate = true; 1586 } 1587 } 1588 } 1589 1590 fclose(fp); 1591 if (!Lst_IsEmpty(&missingFiles)) { 1592 DEBUG2(META, "%s: missing files: %s...\n", 1593 fname, (char *)missingFiles.first->datum); 1594 oodate = true; 1595 } 1596 if (!oodate && !have_filemon && filemonMissing) { 1597 DEBUG1(META, "%s: missing filemon data\n", fname); 1598 oodate = true; 1599 } 1600 } else { 1601 if (writeMeta && (metaMissing || (gn->type & OP_META))) { 1602 const char *cp = NULL; 1603 1604 /* if target is in .CURDIR we do not need a meta file */ 1605 if (gn->path != NULL && (cp = strrchr(gn->path, '/')) != NULL && 1606 (cp > gn->path)) { 1607 if (strncmp(curdir, gn->path, (size_t)(cp - gn->path)) != 0) { 1608 cp = NULL; /* not in .CURDIR */ 1609 } 1610 } 1611 if (cp == NULL) { 1612 DEBUG1(META, "%s: required but missing\n", fname); 1613 oodate = true; 1614 needOODATE = true; /* assume the worst */ 1615 } 1616 } 1617 } 1618 1619 Lst_DoneCall(&missingFiles, free); 1620 1621 if (oodate && needOODATE) { 1622 /* 1623 * Target uses .OODATE which is empty; or we wouldn't be here. 1624 * We have decided it is oodate, so .OODATE needs to be set. 1625 * All we can sanely do is set it to .ALLSRC. 1626 */ 1627 Var_Delete(gn, OODATE); 1628 Var_Set(gn, OODATE, GNode_VarAllsrc(gn)); 1629 } 1630 1631 oodate_out: 1632 FStr_Done(&dname); 1633 return oodate; 1634 } 1635 1636 /* support for compat mode */ 1637 1638 static int childPipe[2]; 1639 1640 void 1641 meta_compat_start(void) 1642 { 1643 #ifdef USE_FILEMON_ONCE 1644 /* 1645 * We need to re-open filemon for each cmd. 1646 */ 1647 BuildMon *pbm = &Mybm; 1648 1649 if (pbm->mfp != NULL && useFilemon) { 1650 meta_open_filemon(pbm); 1651 } else { 1652 pbm->mon_fd = -1; 1653 pbm->filemon = NULL; 1654 } 1655 #endif 1656 if (pipe(childPipe) < 0) 1657 Punt("Cannot create pipe: %s", strerror(errno)); 1658 /* Set close-on-exec flag for both */ 1659 (void)fcntl(childPipe[0], F_SETFD, FD_CLOEXEC); 1660 (void)fcntl(childPipe[1], F_SETFD, FD_CLOEXEC); 1661 } 1662 1663 void 1664 meta_compat_child(void) 1665 { 1666 meta_job_child(NULL); 1667 if (dup2(childPipe[1], 1) < 0 || dup2(1, 2) < 0) 1668 execDie("dup2", "pipe"); 1669 } 1670 1671 void 1672 meta_compat_parent(pid_t child) 1673 { 1674 int outfd, metafd, maxfd, nfds; 1675 char buf[BUFSIZ+1]; 1676 fd_set readfds; 1677 1678 meta_job_parent(NULL, child); 1679 close(childPipe[1]); /* child side */ 1680 outfd = childPipe[0]; 1681 #ifdef USE_FILEMON 1682 metafd = Mybm.filemon != NULL ? filemon_readfd(Mybm.filemon) : -1; 1683 #else 1684 metafd = -1; 1685 #endif 1686 maxfd = -1; 1687 if (outfd > maxfd) 1688 maxfd = outfd; 1689 if (metafd > maxfd) 1690 maxfd = metafd; 1691 1692 while (outfd != -1 || metafd != -1) { 1693 FD_ZERO(&readfds); 1694 if (outfd != -1) { 1695 FD_SET(outfd, &readfds); 1696 } 1697 if (metafd != -1) { 1698 FD_SET(metafd, &readfds); 1699 } 1700 nfds = select(maxfd + 1, &readfds, NULL, NULL, NULL); 1701 if (nfds == -1) { 1702 if (errno == EINTR) 1703 continue; 1704 err(1, "select"); 1705 } 1706 1707 if (outfd != -1 && FD_ISSET(outfd, &readfds) != 0) do { 1708 /* XXX this is not line-buffered */ 1709 ssize_t nread = read(outfd, buf, sizeof buf - 1); 1710 if (nread == -1) 1711 err(1, "read"); 1712 if (nread == 0) { 1713 close(outfd); 1714 outfd = -1; 1715 break; 1716 } 1717 fwrite(buf, 1, (size_t)nread, stdout); 1718 fflush(stdout); 1719 buf[nread] = '\0'; 1720 meta_job_output(NULL, buf, ""); 1721 } while (false); 1722 if (metafd != -1 && FD_ISSET(metafd, &readfds) != 0) { 1723 if (meta_job_event(NULL) <= 0) 1724 metafd = -1; 1725 } 1726 } 1727 } 1728 1729 #endif /* USE_META */ 1730