1 /* $NetBSD: meta.c,v 1.177 2021/02/05 19:19:17 sjg 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 73 Boolean useMeta = FALSE; 74 static Boolean useFilemon = FALSE; 75 static Boolean writeMeta = FALSE; 76 static Boolean metaMissing = FALSE; /* oodate if missing */ 77 static Boolean filemonMissing = FALSE; /* oodate if missing */ 78 static Boolean metaEnv = FALSE; /* don't save env unless asked */ 79 static Boolean metaVerbose = FALSE; 80 static Boolean metaIgnoreCMDs = FALSE; /* ignore CMDs in .meta files */ 81 static Boolean metaIgnorePatterns = FALSE; /* do we need to do pattern matches */ 82 static Boolean metaIgnoreFilter = FALSE; /* do we have more complex filtering? */ 83 static Boolean metaCurdirOk = FALSE; /* write .meta in .CURDIR Ok? */ 84 static Boolean metaSilent = FALSE; /* if we have a .meta be SILENT */ 85 86 extern Boolean forceJobs; 87 extern char **environ; 88 89 #define MAKE_META_PREFIX ".MAKE.META.PREFIX" 90 91 #ifndef N2U 92 # define N2U(n, u) (((n) + ((u) - 1)) / (u)) 93 #endif 94 #ifndef ROUNDUP 95 # define ROUNDUP(n, u) (N2U((n), (u)) * (u)) 96 #endif 97 98 #if !defined(HAVE_STRSEP) 99 # define strsep(s, d) stresep((s), (d), '\0') 100 #endif 101 102 /* 103 * Filemon is a kernel module which snoops certain syscalls. 104 * 105 * C chdir 106 * E exec 107 * F [v]fork 108 * L [sym]link 109 * M rename 110 * R read 111 * W write 112 * S stat 113 * 114 * See meta_oodate below - we mainly care about 'E' and 'R'. 115 * 116 * We can still use meta mode without filemon, but 117 * the benefits are more limited. 118 */ 119 #ifdef USE_FILEMON 120 121 /* 122 * Open the filemon device. 123 */ 124 static void 125 meta_open_filemon(BuildMon *pbm) 126 { 127 int dupfd; 128 129 pbm->mon_fd = -1; 130 pbm->filemon = NULL; 131 if (!useFilemon || pbm->mfp == NULL) 132 return; 133 134 pbm->filemon = filemon_open(); 135 if (pbm->filemon == NULL) { 136 useFilemon = FALSE; 137 warn("Could not open filemon %s", filemon_path()); 138 return; 139 } 140 141 /* 142 * We use a file outside of '.' 143 * to avoid a FreeBSD kernel bug where unlink invalidates 144 * cwd causing getcwd to do a lot more work. 145 * We only care about the descriptor. 146 */ 147 if (!opts.compatMake) 148 pbm->mon_fd = Job_TempFile("filemon.XXXXXX", NULL, 0); 149 else 150 pbm->mon_fd = mkTempFile("filemon.XXXXXX", NULL, 0); 151 if ((dupfd = dup(pbm->mon_fd)) == -1) { 152 err(1, "Could not dup filemon output!"); 153 } 154 (void)fcntl(dupfd, F_SETFD, FD_CLOEXEC); 155 if (filemon_setfd(pbm->filemon, dupfd) == -1) { 156 err(1, "Could not set filemon file descriptor!"); 157 } 158 /* we don't need these once we exec */ 159 (void)fcntl(pbm->mon_fd, F_SETFD, FD_CLOEXEC); 160 } 161 162 /* 163 * Read the build monitor output file and write records to the target's 164 * metadata file. 165 */ 166 static int 167 filemon_read(FILE *mfp, int fd) 168 { 169 char buf[BUFSIZ]; 170 int error; 171 172 /* Check if we're not writing to a meta data file.*/ 173 if (mfp == NULL) { 174 if (fd >= 0) 175 close(fd); /* not interested */ 176 return 0; 177 } 178 /* rewind */ 179 if (lseek(fd, (off_t)0, SEEK_SET) < 0) { 180 error = errno; 181 warn("Could not rewind filemon"); 182 fprintf(mfp, "\n"); 183 } else { 184 ssize_t n; 185 186 error = 0; 187 fprintf(mfp, "\n-- filemon acquired metadata --\n"); 188 189 while ((n = read(fd, buf, sizeof buf)) > 0) { 190 if ((ssize_t)fwrite(buf, 1, (size_t)n, mfp) < n) 191 error = EIO; 192 } 193 } 194 fflush(mfp); 195 if (close(fd) < 0) 196 error = errno; 197 return error; 198 } 199 #endif 200 201 /* 202 * when realpath() fails, 203 * we use this, to clean up ./ and ../ 204 */ 205 static void 206 eat_dots(char *buf, size_t bufsz, int dots) 207 { 208 char *cp; 209 char *cp2; 210 const char *eat; 211 size_t eatlen; 212 213 switch (dots) { 214 case 1: 215 eat = "/./"; 216 eatlen = 2; 217 break; 218 case 2: 219 eat = "/../"; 220 eatlen = 3; 221 break; 222 default: 223 return; 224 } 225 226 do { 227 cp = strstr(buf, eat); 228 if (cp != NULL) { 229 cp2 = cp + eatlen; 230 if (dots == 2 && cp > buf) { 231 do { 232 cp--; 233 } while (cp > buf && *cp != '/'); 234 } 235 if (*cp == '/') { 236 strlcpy(cp, cp2, bufsz - (size_t)(cp - buf)); 237 } else { 238 return; /* can't happen? */ 239 } 240 } 241 } while (cp != NULL); 242 } 243 244 static char * 245 meta_name(char *mname, size_t mnamelen, 246 const char *dname, 247 const char *tname, 248 const char *cwd) 249 { 250 char buf[MAXPATHLEN]; 251 char *rp; 252 char *cp; 253 char *tp; 254 char *dtp; 255 size_t ldname; 256 257 /* 258 * Weed out relative paths from the target file name. 259 * We have to be careful though since if target is a 260 * symlink, the result will be unstable. 261 * So we use realpath() just to get the dirname, and leave the 262 * basename as given to us. 263 */ 264 if ((cp = strrchr(tname, '/')) != NULL) { 265 if (cached_realpath(tname, buf) != NULL) { 266 if ((rp = strrchr(buf, '/')) != NULL) { 267 rp++; 268 cp++; 269 if (strcmp(cp, rp) != 0) 270 strlcpy(rp, cp, sizeof buf - (size_t)(rp - buf)); 271 } 272 tname = buf; 273 } else { 274 /* 275 * We likely have a directory which is about to be made. 276 * We pretend realpath() succeeded, to have a chance 277 * of generating the same meta file name that we will 278 * next time through. 279 */ 280 if (tname[0] == '/') { 281 strlcpy(buf, tname, sizeof buf); 282 } else { 283 snprintf(buf, sizeof buf, "%s/%s", cwd, tname); 284 } 285 eat_dots(buf, sizeof buf, 1); /* ./ */ 286 eat_dots(buf, sizeof buf, 2); /* ../ */ 287 tname = buf; 288 } 289 } 290 /* on some systems dirname may modify its arg */ 291 tp = bmake_strdup(tname); 292 dtp = dirname(tp); 293 if (strcmp(dname, dtp) == 0) 294 snprintf(mname, mnamelen, "%s.meta", tname); 295 else { 296 ldname = strlen(dname); 297 if (strncmp(dname, dtp, ldname) == 0 && dtp[ldname] == '/') 298 snprintf(mname, mnamelen, "%s/%s.meta", dname, &tname[ldname+1]); 299 else 300 snprintf(mname, mnamelen, "%s/%s.meta", dname, tname); 301 302 /* 303 * Replace path separators in the file name after the 304 * current object directory path. 305 */ 306 cp = mname + strlen(dname) + 1; 307 308 while (*cp != '\0') { 309 if (*cp == '/') 310 *cp = '_'; 311 cp++; 312 } 313 } 314 free(tp); 315 return mname; 316 } 317 318 /* 319 * Return true if running ${.MAKE} 320 * Bypassed if target is flagged .MAKE 321 */ 322 static Boolean 323 is_submake(const char *cmd, GNode *gn) 324 { 325 static const char *p_make = NULL; 326 static size_t p_len; 327 char *mp = NULL; 328 char *cp; 329 char *cp2; 330 Boolean rc = FALSE; 331 332 if (p_make == NULL) { 333 p_make = Var_Value(gn, ".MAKE").str; 334 p_len = strlen(p_make); 335 } 336 cp = strchr(cmd, '$'); 337 if (cp != NULL) { 338 (void)Var_Subst(cmd, gn, VARE_WANTRES, &mp); 339 /* TODO: handle errors */ 340 cmd = mp; 341 } 342 cp2 = strstr(cmd, p_make); 343 if (cp2 != NULL) { 344 switch (cp2[p_len]) { 345 case '\0': 346 case ' ': 347 case '\t': 348 case '\n': 349 rc = TRUE; 350 break; 351 } 352 if (cp2 > cmd && rc) { 353 switch (cp2[-1]) { 354 case ' ': 355 case '\t': 356 case '\n': 357 break; 358 default: 359 rc = FALSE; /* no match */ 360 break; 361 } 362 } 363 } 364 free(mp); 365 return rc; 366 } 367 368 static Boolean 369 any_is_submake(GNode *gn) 370 { 371 StringListNode *ln; 372 373 for (ln = gn->commands.first; ln != NULL; ln = ln->next) 374 if (is_submake(ln->datum, gn)) 375 return TRUE; 376 return FALSE; 377 } 378 379 static void 380 printCMD(const char *cmd, FILE *fp, GNode *gn) 381 { 382 char *cmd_freeIt = NULL; 383 384 if (strchr(cmd, '$') != NULL) { 385 (void)Var_Subst(cmd, gn, VARE_WANTRES, &cmd_freeIt); 386 /* TODO: handle errors */ 387 cmd = cmd_freeIt; 388 } 389 fprintf(fp, "CMD %s\n", cmd); 390 free(cmd_freeIt); 391 } 392 393 static void 394 printCMDs(GNode *gn, FILE *fp) 395 { 396 StringListNode *ln; 397 398 for (ln = gn->commands.first; ln != NULL; ln = ln->next) 399 printCMD(ln->datum, fp, gn); 400 } 401 402 /* 403 * Certain node types never get a .meta file 404 */ 405 #define SKIP_META_TYPE(_type) do { \ 406 if ((gn->type & __CONCAT(OP_, _type))) { \ 407 if (verbose) { \ 408 debug_printf("Skipping meta for %s: .%s\n", \ 409 gn->name, __STRING(_type)); \ 410 } \ 411 return FALSE; \ 412 } \ 413 } while (/*CONSTCOND*/FALSE) 414 415 416 /* 417 * Do we need/want a .meta file ? 418 */ 419 static Boolean 420 meta_needed(GNode *gn, const char *dname, 421 char *objdir_realpath, Boolean verbose) 422 { 423 struct cached_stat cst; 424 425 if (verbose) 426 verbose = DEBUG(META); 427 428 /* This may be a phony node which we don't want meta data for... */ 429 /* Skip .meta for .BEGIN, .END, .ERROR etc as well. */ 430 /* Or it may be explicitly flagged as .NOMETA */ 431 SKIP_META_TYPE(NOMETA); 432 /* Unless it is explicitly flagged as .META */ 433 if (!(gn->type & OP_META)) { 434 SKIP_META_TYPE(PHONY); 435 SKIP_META_TYPE(SPECIAL); 436 SKIP_META_TYPE(MAKE); 437 } 438 439 /* Check if there are no commands to execute. */ 440 if (Lst_IsEmpty(&gn->commands)) { 441 if (verbose) 442 debug_printf("Skipping meta for %s: no commands\n", gn->name); 443 return FALSE; 444 } 445 if ((gn->type & (OP_META|OP_SUBMAKE)) == OP_SUBMAKE) { 446 /* OP_SUBMAKE is a bit too aggressive */ 447 if (any_is_submake(gn)) { 448 DEBUG1(META, "Skipping meta for %s: .SUBMAKE\n", gn->name); 449 return FALSE; 450 } 451 } 452 453 /* The object directory may not exist. Check it.. */ 454 if (cached_stat(dname, &cst) != 0) { 455 if (verbose) 456 debug_printf("Skipping meta for %s: no .OBJDIR\n", gn->name); 457 return FALSE; 458 } 459 460 /* make sure these are canonical */ 461 if (cached_realpath(dname, objdir_realpath) != NULL) 462 dname = objdir_realpath; 463 464 /* If we aren't in the object directory, don't create a meta file. */ 465 if (!metaCurdirOk && strcmp(curdir, dname) == 0) { 466 if (verbose) 467 debug_printf("Skipping meta for %s: .OBJDIR == .CURDIR\n", 468 gn->name); 469 return FALSE; 470 } 471 return TRUE; 472 } 473 474 475 static FILE * 476 meta_create(BuildMon *pbm, GNode *gn) 477 { 478 FILE *fp; 479 char buf[MAXPATHLEN]; 480 char objdir_realpath[MAXPATHLEN]; 481 char **ptr; 482 FStr dname; 483 const char *tname; 484 char *fname; 485 const char *cp; 486 487 fp = NULL; 488 489 dname = Var_Value(gn, ".OBJDIR"); 490 tname = GNode_VarTarget(gn); 491 492 /* if this succeeds objdir_realpath is realpath of dname */ 493 if (!meta_needed(gn, dname.str, objdir_realpath, TRUE)) 494 goto out; 495 dname.str = objdir_realpath; 496 497 if (metaVerbose) { 498 char *mp; 499 500 /* Describe the target we are building */ 501 (void)Var_Subst("${" MAKE_META_PREFIX "}", gn, VARE_WANTRES, &mp); 502 /* TODO: handle errors */ 503 if (mp[0] != '\0') 504 fprintf(stdout, "%s\n", mp); 505 free(mp); 506 } 507 /* Get the basename of the target */ 508 cp = str_basename(tname); 509 510 fflush(stdout); 511 512 if (!writeMeta) 513 /* Don't create meta data. */ 514 goto out; 515 516 fname = meta_name(pbm->meta_fname, sizeof pbm->meta_fname, 517 dname.str, tname, objdir_realpath); 518 519 #ifdef DEBUG_META_MODE 520 DEBUG1(META, "meta_create: %s\n", fname); 521 #endif 522 523 if ((fp = fopen(fname, "w")) == NULL) 524 err(1, "Could not open meta file '%s'", fname); 525 526 fprintf(fp, "# Meta data file %s\n", fname); 527 528 printCMDs(gn, fp); 529 530 fprintf(fp, "CWD %s\n", getcwd(buf, sizeof buf)); 531 fprintf(fp, "TARGET %s\n", tname); 532 cp = GNode_VarOodate(gn); 533 if (cp != NULL && *cp != '\0') { 534 fprintf(fp, "OODATE %s\n", cp); 535 } 536 if (metaEnv) { 537 for (ptr = environ; *ptr != NULL; ptr++) 538 fprintf(fp, "ENV %s\n", *ptr); 539 } 540 541 fprintf(fp, "-- command output --\n"); 542 fflush(fp); 543 544 Global_Append(".MAKE.META.FILES", fname); 545 Global_Append(".MAKE.META.CREATED", fname); 546 547 gn->type |= OP_META; /* in case anyone wants to know */ 548 if (metaSilent) { 549 gn->type |= OP_SILENT; 550 } 551 out: 552 FStr_Done(&dname); 553 554 return fp; 555 } 556 557 static Boolean 558 boolValue(char *s) 559 { 560 switch(*s) { 561 case '0': 562 case 'N': 563 case 'n': 564 case 'F': 565 case 'f': 566 return FALSE; 567 } 568 return TRUE; 569 } 570 571 /* 572 * Initialization we need before reading makefiles. 573 */ 574 void 575 meta_init(void) 576 { 577 #ifdef USE_FILEMON 578 /* this allows makefiles to test if we have filemon support */ 579 Global_Set(".MAKE.PATH_FILEMON", filemon_path()); 580 #endif 581 } 582 583 584 #define get_mode_bf(bf, token) \ 585 if ((cp = strstr(make_mode, token)) != NULL) \ 586 bf = boolValue(cp + sizeof (token) - 1) 587 588 /* 589 * Initialization we need after reading makefiles. 590 */ 591 void 592 meta_mode_init(const char *make_mode) 593 { 594 static Boolean once = FALSE; 595 char *cp; 596 FStr value; 597 598 useMeta = TRUE; 599 useFilemon = TRUE; 600 writeMeta = TRUE; 601 602 if (make_mode != NULL) { 603 if (strstr(make_mode, "env") != NULL) 604 metaEnv = TRUE; 605 if (strstr(make_mode, "verb") != NULL) 606 metaVerbose = TRUE; 607 if (strstr(make_mode, "read") != NULL) 608 writeMeta = FALSE; 609 if (strstr(make_mode, "nofilemon") != NULL) 610 useFilemon = FALSE; 611 if (strstr(make_mode, "ignore-cmd") != NULL) 612 metaIgnoreCMDs = TRUE; 613 if (useFilemon) 614 get_mode_bf(filemonMissing, "missing-filemon="); 615 get_mode_bf(metaCurdirOk, "curdirok="); 616 get_mode_bf(metaMissing, "missing-meta="); 617 get_mode_bf(metaSilent, "silent="); 618 } 619 if (metaVerbose && !Var_Exists(SCOPE_GLOBAL, MAKE_META_PREFIX)) { 620 /* 621 * The default value for MAKE_META_PREFIX 622 * prints the absolute path of the target. 623 * This works be cause :H will generate '.' if there is no / 624 * and :tA will resolve that to cwd. 625 */ 626 Global_Set(MAKE_META_PREFIX, 627 "Building ${.TARGET:H:tA}/${.TARGET:T}"); 628 } 629 if (once) 630 return; 631 once = TRUE; 632 memset(&Mybm, 0, sizeof Mybm); 633 /* 634 * We consider ourselves master of all within ${.MAKE.META.BAILIWICK} 635 */ 636 (void)Var_Subst("${.MAKE.META.BAILIWICK:O:u:tA}", 637 SCOPE_GLOBAL, VARE_WANTRES, &metaBailiwickStr); 638 /* TODO: handle errors */ 639 str2Lst_Append(&metaBailiwick, metaBailiwickStr); 640 /* 641 * We ignore any paths that start with ${.MAKE.META.IGNORE_PATHS} 642 */ 643 Global_Append(MAKE_META_IGNORE_PATHS, 644 "/dev /etc /proc /tmp /var/run /var/tmp ${TMPDIR}"); 645 (void)Var_Subst("${" MAKE_META_IGNORE_PATHS ":O:u:tA}", 646 SCOPE_GLOBAL, VARE_WANTRES, &metaIgnorePathsStr); 647 /* TODO: handle errors */ 648 str2Lst_Append(&metaIgnorePaths, metaIgnorePathsStr); 649 650 /* 651 * We ignore any paths that match ${.MAKE.META.IGNORE_PATTERNS} 652 */ 653 value = Var_Value(SCOPE_GLOBAL, MAKE_META_IGNORE_PATTERNS); 654 if (value.str != NULL) { 655 metaIgnorePatterns = TRUE; 656 FStr_Done(&value); 657 } 658 value = Var_Value(SCOPE_GLOBAL, MAKE_META_IGNORE_FILTER); 659 if (value.str != NULL) { 660 metaIgnoreFilter = TRUE; 661 FStr_Done(&value); 662 } 663 } 664 665 /* 666 * In each case below we allow for job==NULL 667 */ 668 void 669 meta_job_start(Job *job, GNode *gn) 670 { 671 BuildMon *pbm; 672 673 if (job != NULL) { 674 pbm = &job->bm; 675 } else { 676 pbm = &Mybm; 677 } 678 pbm->mfp = meta_create(pbm, gn); 679 #ifdef USE_FILEMON_ONCE 680 /* compat mode we open the filemon dev once per command */ 681 if (job == NULL) 682 return; 683 #endif 684 #ifdef USE_FILEMON 685 if (pbm->mfp != NULL && useFilemon) { 686 meta_open_filemon(pbm); 687 } else { 688 pbm->mon_fd = -1; 689 pbm->filemon = NULL; 690 } 691 #endif 692 } 693 694 /* 695 * The child calls this before doing anything. 696 * It does not disturb our state. 697 */ 698 void 699 meta_job_child(Job __unused *job) 700 { 701 #ifdef USE_FILEMON 702 BuildMon *pbm; 703 704 if (job != NULL) { 705 pbm = &job->bm; 706 } else { 707 pbm = &Mybm; 708 } 709 if (pbm->mfp != NULL) { 710 close(fileno(pbm->mfp)); 711 if (useFilemon && pbm->filemon != NULL) { 712 pid_t pid; 713 714 pid = getpid(); 715 if (filemon_setpid_child(pbm->filemon, pid) == -1) { 716 err(1, "Could not set filemon pid!"); 717 } 718 } 719 } 720 #endif 721 } 722 723 void 724 meta_job_parent(Job *job, pid_t pid) 725 { 726 #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV) 727 BuildMon *pbm; 728 729 if (job != NULL) { 730 pbm = &job->bm; 731 } else { 732 pbm = &Mybm; 733 } 734 if (useFilemon && pbm->filemon != NULL) { 735 filemon_setpid_parent(pbm->filemon, pid); 736 } 737 #endif 738 } 739 740 int 741 meta_job_fd(Job *job) 742 { 743 #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV) 744 BuildMon *pbm; 745 746 if (job != NULL) { 747 pbm = &job->bm; 748 } else { 749 pbm = &Mybm; 750 } 751 if (useFilemon && pbm->filemon != NULL) { 752 return filemon_readfd(pbm->filemon); 753 } 754 #endif 755 return -1; 756 } 757 758 int 759 meta_job_event(Job *job) 760 { 761 #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV) 762 BuildMon *pbm; 763 764 if (job != NULL) { 765 pbm = &job->bm; 766 } else { 767 pbm = &Mybm; 768 } 769 if (useFilemon && pbm->filemon != NULL) { 770 return filemon_process(pbm->filemon); 771 } 772 #endif 773 return 0; 774 } 775 776 void 777 meta_job_error(Job *job, GNode *gn, Boolean ignerr, int status) 778 { 779 char cwd[MAXPATHLEN]; 780 BuildMon *pbm; 781 782 if (job != NULL) { 783 pbm = &job->bm; 784 if (gn == NULL) 785 gn = job->node; 786 } else { 787 pbm = &Mybm; 788 } 789 if (pbm->mfp != NULL) { 790 fprintf(pbm->mfp, "\n*** Error code %d%s\n", 791 status, ignerr ? "(ignored)" : ""); 792 } 793 if (gn != NULL) 794 Global_Set(".ERROR_TARGET", GNode_Path(gn)); 795 getcwd(cwd, sizeof cwd); 796 Global_Set(".ERROR_CWD", cwd); 797 if (pbm->meta_fname[0] != '\0') { 798 Global_Set(".ERROR_META_FILE", pbm->meta_fname); 799 } 800 meta_job_finish(job); 801 } 802 803 void 804 meta_job_output(Job *job, char *cp, const char *nl) 805 { 806 BuildMon *pbm; 807 808 if (job != NULL) { 809 pbm = &job->bm; 810 } else { 811 pbm = &Mybm; 812 } 813 if (pbm->mfp != NULL) { 814 if (metaVerbose) { 815 static char *meta_prefix = NULL; 816 static size_t meta_prefix_len; 817 818 if (meta_prefix == NULL) { 819 char *cp2; 820 821 (void)Var_Subst("${" MAKE_META_PREFIX "}", 822 SCOPE_GLOBAL, VARE_WANTRES, &meta_prefix); 823 /* TODO: handle errors */ 824 if ((cp2 = strchr(meta_prefix, '$')) != NULL) 825 meta_prefix_len = (size_t)(cp2 - meta_prefix); 826 else 827 meta_prefix_len = strlen(meta_prefix); 828 } 829 if (strncmp(cp, meta_prefix, meta_prefix_len) == 0) { 830 cp = strchr(cp + 1, '\n'); 831 if (cp == NULL) 832 return; 833 cp++; 834 } 835 } 836 fprintf(pbm->mfp, "%s%s", cp, nl); 837 } 838 } 839 840 int 841 meta_cmd_finish(void __unused *pbmp) 842 { 843 int error = 0; 844 BuildMon *pbm = pbmp; 845 #ifdef USE_FILEMON 846 int x; 847 #endif 848 849 if (pbm == NULL) 850 pbm = &Mybm; 851 852 #ifdef USE_FILEMON 853 if (pbm->filemon != NULL) { 854 while (filemon_process(pbm->filemon) > 0) 855 continue; 856 if (filemon_close(pbm->filemon) == -1) 857 error = errno; 858 x = filemon_read(pbm->mfp, pbm->mon_fd); 859 if (error == 0 && x != 0) 860 error = x; 861 pbm->mon_fd = -1; 862 pbm->filemon = NULL; 863 return error; 864 } 865 #endif 866 867 fprintf(pbm->mfp, "\n"); /* ensure end with newline */ 868 return error; 869 } 870 871 int 872 meta_job_finish(Job *job) 873 { 874 BuildMon *pbm; 875 int error = 0; 876 int x; 877 878 if (job != NULL) { 879 pbm = &job->bm; 880 } else { 881 pbm = &Mybm; 882 } 883 if (pbm->mfp != NULL) { 884 error = meta_cmd_finish(pbm); 885 x = fclose(pbm->mfp); 886 if (error == 0 && x != 0) 887 error = errno; 888 pbm->mfp = NULL; 889 pbm->meta_fname[0] = '\0'; 890 } 891 return error; 892 } 893 894 void 895 meta_finish(void) 896 { 897 Lst_Done(&metaBailiwick); 898 free(metaBailiwickStr); 899 Lst_Done(&metaIgnorePaths); 900 free(metaIgnorePathsStr); 901 } 902 903 /* 904 * Fetch a full line from fp - growing bufp if needed 905 * Return length in bufp. 906 */ 907 static int 908 fgetLine(char **bufp, size_t *szp, int o, FILE *fp) 909 { 910 char *buf = *bufp; 911 size_t bufsz = *szp; 912 struct stat fs; 913 int x; 914 915 if (fgets(&buf[o], (int)bufsz - o, fp) != NULL) { 916 check_newline: 917 x = o + (int)strlen(&buf[o]); 918 if (buf[x - 1] == '\n') 919 return x; 920 /* 921 * We need to grow the buffer. 922 * The meta file can give us a clue. 923 */ 924 if (fstat(fileno(fp), &fs) == 0) { 925 size_t newsz; 926 char *p; 927 928 newsz = ROUNDUP(((size_t)fs.st_size / 2), BUFSIZ); 929 if (newsz <= bufsz) 930 newsz = ROUNDUP((size_t)fs.st_size, BUFSIZ); 931 if (newsz <= bufsz) 932 return x; /* truncated */ 933 DEBUG2(META, "growing buffer %u -> %u\n", 934 (unsigned)bufsz, (unsigned)newsz); 935 p = bmake_realloc(buf, newsz); 936 *bufp = buf = p; 937 *szp = bufsz = newsz; 938 /* fetch the rest */ 939 if (fgets(&buf[x], (int)bufsz - x, fp) == NULL) 940 return x; /* truncated! */ 941 goto check_newline; 942 } 943 } 944 return 0; 945 } 946 947 static Boolean 948 prefix_match(const char *prefix, const char *path) 949 { 950 size_t n = strlen(prefix); 951 952 return strncmp(path, prefix, n) == 0; 953 } 954 955 static Boolean 956 has_any_prefix(const char *path, StringList *prefixes) 957 { 958 StringListNode *ln; 959 960 for (ln = prefixes->first; ln != NULL; ln = ln->next) 961 if (prefix_match(ln->datum, path)) 962 return TRUE; 963 return FALSE; 964 } 965 966 /* See if the path equals prefix or starts with "prefix/". */ 967 static Boolean 968 path_starts_with(const char *path, const char *prefix) 969 { 970 size_t n = strlen(prefix); 971 972 if (strncmp(path, prefix, n) != 0) 973 return FALSE; 974 return path[n] == '\0' || path[n] == '/'; 975 } 976 977 static Boolean 978 meta_ignore(GNode *gn, const char *p) 979 { 980 char fname[MAXPATHLEN]; 981 982 if (p == NULL) 983 return TRUE; 984 985 if (*p == '/') { 986 cached_realpath(p, fname); /* clean it up */ 987 if (has_any_prefix(fname, &metaIgnorePaths)) { 988 #ifdef DEBUG_META_MODE 989 DEBUG1(META, "meta_oodate: ignoring path: %s\n", p); 990 #endif 991 return TRUE; 992 } 993 } 994 995 if (metaIgnorePatterns) { 996 const char *expr; 997 char *pm; 998 999 /* 1000 * XXX: This variable is set on a target GNode but is not one of 1001 * the usual local variables. It should be deleted afterwards. 1002 * Ideally it would not be created in the first place, just like 1003 * in a .for loop. 1004 */ 1005 Var_Set(gn, ".p.", p); 1006 expr = "${" MAKE_META_IGNORE_PATTERNS ":@m@${.p.:M$m}@}"; 1007 (void)Var_Subst(expr, gn, VARE_WANTRES, &pm); 1008 /* TODO: handle errors */ 1009 if (pm[0] != '\0') { 1010 #ifdef DEBUG_META_MODE 1011 DEBUG1(META, "meta_oodate: ignoring pattern: %s\n", p); 1012 #endif 1013 free(pm); 1014 return TRUE; 1015 } 1016 free(pm); 1017 } 1018 1019 if (metaIgnoreFilter) { 1020 char *fm; 1021 1022 /* skip if filter result is empty */ 1023 snprintf(fname, sizeof fname, 1024 "${%s:L:${%s:ts:}}", 1025 p, MAKE_META_IGNORE_FILTER); 1026 (void)Var_Subst(fname, gn, VARE_WANTRES, &fm); 1027 /* TODO: handle errors */ 1028 if (*fm == '\0') { 1029 #ifdef DEBUG_META_MODE 1030 DEBUG1(META, "meta_oodate: ignoring filtered: %s\n", p); 1031 #endif 1032 free(fm); 1033 return TRUE; 1034 } 1035 free(fm); 1036 } 1037 return FALSE; 1038 } 1039 1040 /* 1041 * When running with 'meta' functionality, a target can be out-of-date 1042 * if any of the references in its meta data file is more recent. 1043 * We have to track the latestdir on a per-process basis. 1044 */ 1045 #define LCWD_VNAME_FMT ".meta.%d.lcwd" 1046 #define LDIR_VNAME_FMT ".meta.%d.ldir" 1047 1048 /* 1049 * It is possible that a .meta file is corrupted, 1050 * if we detect this we want to reproduce it. 1051 * Setting oodate TRUE will have that effect. 1052 */ 1053 #define CHECK_VALID_META(p) if (!(p != NULL && *p != '\0')) { \ 1054 warnx("%s: %d: malformed", fname, lineno); \ 1055 oodate = TRUE; \ 1056 continue; \ 1057 } 1058 1059 #define DEQUOTE(p) if (*p == '\'') { \ 1060 char *ep; \ 1061 p++; \ 1062 if ((ep = strchr(p, '\'')) != NULL) \ 1063 *ep = '\0'; \ 1064 } 1065 1066 static void 1067 append_if_new(StringList *list, const char *str) 1068 { 1069 StringListNode *ln; 1070 1071 for (ln = list->first; ln != NULL; ln = ln->next) 1072 if (strcmp(ln->datum, str) == 0) 1073 return; 1074 Lst_Append(list, bmake_strdup(str)); 1075 } 1076 1077 Boolean 1078 meta_oodate(GNode *gn, Boolean oodate) 1079 { 1080 static char *tmpdir = NULL; 1081 static char cwd[MAXPATHLEN]; 1082 char lcwd_vname[64]; 1083 char ldir_vname[64]; 1084 char lcwd[MAXPATHLEN]; 1085 char latestdir[MAXPATHLEN]; 1086 char fname[MAXPATHLEN]; 1087 char fname1[MAXPATHLEN]; 1088 char fname2[MAXPATHLEN]; 1089 char fname3[MAXPATHLEN]; 1090 FStr dname; 1091 const char *tname; 1092 char *p; 1093 char *link_src; 1094 char *move_target; 1095 static size_t cwdlen = 0; 1096 static size_t tmplen = 0; 1097 FILE *fp; 1098 Boolean needOODATE = FALSE; 1099 StringList missingFiles; 1100 Boolean have_filemon = FALSE; 1101 1102 if (oodate) 1103 return oodate; /* we're done */ 1104 1105 dname = Var_Value(gn, ".OBJDIR"); 1106 tname = GNode_VarTarget(gn); 1107 1108 /* if this succeeds fname3 is realpath of dname */ 1109 if (!meta_needed(gn, dname.str, fname3, FALSE)) 1110 goto oodate_out; 1111 dname.str = fname3; 1112 1113 Lst_Init(&missingFiles); 1114 1115 /* 1116 * We need to check if the target is out-of-date. This includes 1117 * checking if the expanded command has changed. This in turn 1118 * requires that all variables are set in the same way that they 1119 * would be if the target needs to be re-built. 1120 */ 1121 Make_DoAllVar(gn); 1122 1123 meta_name(fname, sizeof fname, dname.str, tname, dname.str); 1124 1125 #ifdef DEBUG_META_MODE 1126 DEBUG1(META, "meta_oodate: %s\n", fname); 1127 #endif 1128 1129 if ((fp = fopen(fname, "r")) != NULL) { 1130 static char *buf = NULL; 1131 static size_t bufsz; 1132 int lineno = 0; 1133 int lastpid = 0; 1134 int pid; 1135 int x; 1136 StringListNode *cmdNode; 1137 struct cached_stat cst; 1138 1139 if (buf == NULL) { 1140 bufsz = 8 * BUFSIZ; 1141 buf = bmake_malloc(bufsz); 1142 } 1143 1144 if (cwdlen == 0) { 1145 if (getcwd(cwd, sizeof cwd) == NULL) 1146 err(1, "Could not get current working directory"); 1147 cwdlen = strlen(cwd); 1148 } 1149 strlcpy(lcwd, cwd, sizeof lcwd); 1150 strlcpy(latestdir, cwd, sizeof latestdir); 1151 1152 if (tmpdir == NULL) { 1153 tmpdir = getTmpdir(); 1154 tmplen = strlen(tmpdir); 1155 } 1156 1157 /* we want to track all the .meta we read */ 1158 Global_Append(".MAKE.META.FILES", fname); 1159 1160 cmdNode = gn->commands.first; 1161 while (!oodate && (x = fgetLine(&buf, &bufsz, 0, fp)) > 0) { 1162 lineno++; 1163 if (buf[x - 1] == '\n') 1164 buf[x - 1] = '\0'; 1165 else { 1166 warnx("%s: %d: line truncated at %u", fname, lineno, x); 1167 oodate = TRUE; 1168 break; 1169 } 1170 link_src = NULL; 1171 move_target = NULL; 1172 /* Find the start of the build monitor section. */ 1173 if (!have_filemon) { 1174 if (strncmp(buf, "-- filemon", 10) == 0) { 1175 have_filemon = TRUE; 1176 continue; 1177 } 1178 if (strncmp(buf, "# buildmon", 10) == 0) { 1179 have_filemon = TRUE; 1180 continue; 1181 } 1182 } 1183 1184 /* Delimit the record type. */ 1185 p = buf; 1186 #ifdef DEBUG_META_MODE 1187 DEBUG3(META, "%s: %d: %s\n", fname, lineno, buf); 1188 #endif 1189 strsep(&p, " "); 1190 if (have_filemon) { 1191 /* 1192 * We are in the 'filemon' output section. 1193 * Each record from filemon follows the general form: 1194 * 1195 * <key> <pid> <data> 1196 * 1197 * Where: 1198 * <key> is a single letter, denoting the syscall. 1199 * <pid> is the process that made the syscall. 1200 * <data> is the arguments (of interest). 1201 */ 1202 switch(buf[0]) { 1203 case '#': /* comment */ 1204 case 'V': /* version */ 1205 break; 1206 default: 1207 /* 1208 * We need to track pathnames per-process. 1209 * 1210 * Each process run by make starts off in the 'CWD' 1211 * recorded in the .meta file, if it chdirs ('C') 1212 * elsewhere we need to track that - but only for 1213 * that process. If it forks ('F'), we initialize 1214 * the child to have the same cwd as its parent. 1215 * 1216 * We also need to track the 'latestdir' of 1217 * interest. This is usually the same as cwd, but 1218 * not if a process is reading directories. 1219 * 1220 * Each time we spot a different process ('pid') 1221 * we save the current value of 'latestdir' in a 1222 * variable qualified by 'lastpid', and 1223 * re-initialize 'latestdir' to any pre-saved 1224 * value for the current 'pid' and 'CWD' if none. 1225 */ 1226 CHECK_VALID_META(p); 1227 pid = atoi(p); 1228 if (pid > 0 && pid != lastpid) { 1229 FStr ldir; 1230 1231 if (lastpid > 0) { 1232 /* We need to remember these. */ 1233 Global_SetExpand(lcwd_vname, lcwd); 1234 Global_SetExpand(ldir_vname, latestdir); 1235 } 1236 snprintf(lcwd_vname, sizeof lcwd_vname, LCWD_VNAME_FMT, pid); 1237 snprintf(ldir_vname, sizeof ldir_vname, LDIR_VNAME_FMT, pid); 1238 lastpid = pid; 1239 ldir = Var_Value(SCOPE_GLOBAL, ldir_vname); 1240 if (ldir.str != NULL) { 1241 strlcpy(latestdir, ldir.str, sizeof latestdir); 1242 FStr_Done(&ldir); 1243 } 1244 ldir = Var_Value(SCOPE_GLOBAL, lcwd_vname); 1245 if (ldir.str != NULL) { 1246 strlcpy(lcwd, ldir.str, sizeof lcwd); 1247 FStr_Done(&ldir); 1248 } 1249 } 1250 /* Skip past the pid. */ 1251 if (strsep(&p, " ") == NULL) 1252 continue; 1253 #ifdef DEBUG_META_MODE 1254 if (DEBUG(META)) 1255 debug_printf("%s: %d: %d: %c: cwd=%s lcwd=%s ldir=%s\n", 1256 fname, lineno, 1257 pid, buf[0], cwd, lcwd, latestdir); 1258 #endif 1259 break; 1260 } 1261 1262 CHECK_VALID_META(p); 1263 1264 /* Process according to record type. */ 1265 switch (buf[0]) { 1266 case 'X': /* eXit */ 1267 Var_DeleteExpand(SCOPE_GLOBAL, lcwd_vname); 1268 Var_DeleteExpand(SCOPE_GLOBAL, ldir_vname); 1269 lastpid = 0; /* no need to save ldir_vname */ 1270 break; 1271 1272 case 'F': /* [v]Fork */ 1273 { 1274 char cldir[64]; 1275 int child; 1276 1277 child = atoi(p); 1278 if (child > 0) { 1279 snprintf(cldir, sizeof cldir, LCWD_VNAME_FMT, child); 1280 Global_SetExpand(cldir, lcwd); 1281 snprintf(cldir, sizeof cldir, LDIR_VNAME_FMT, child); 1282 Global_SetExpand(cldir, latestdir); 1283 #ifdef DEBUG_META_MODE 1284 if (DEBUG(META)) 1285 debug_printf( 1286 "%s: %d: %d: cwd=%s lcwd=%s ldir=%s\n", 1287 fname, lineno, 1288 child, cwd, lcwd, latestdir); 1289 #endif 1290 } 1291 } 1292 break; 1293 1294 case 'C': /* Chdir */ 1295 /* Update lcwd and latest directory. */ 1296 strlcpy(latestdir, p, sizeof latestdir); 1297 strlcpy(lcwd, p, sizeof lcwd); 1298 Global_SetExpand(lcwd_vname, lcwd); 1299 Global_SetExpand(ldir_vname, lcwd); 1300 #ifdef DEBUG_META_MODE 1301 DEBUG4(META, "%s: %d: cwd=%s ldir=%s\n", 1302 fname, lineno, cwd, lcwd); 1303 #endif 1304 break; 1305 1306 case 'M': /* renaMe */ 1307 /* 1308 * For 'M'oves we want to check 1309 * the src as for 'R'ead 1310 * and the target as for 'W'rite. 1311 */ 1312 { 1313 char *cp = p; /* save this for a second */ 1314 /* now get target */ 1315 if (strsep(&p, " ") == NULL) 1316 continue; 1317 CHECK_VALID_META(p); 1318 move_target = p; 1319 p = cp; 1320 } 1321 /* 'L' and 'M' put single quotes around the args */ 1322 DEQUOTE(p); 1323 DEQUOTE(move_target); 1324 /* FALLTHROUGH */ 1325 case 'D': /* unlink */ 1326 if (*p == '/') { 1327 /* remove any missingFiles entries that match p */ 1328 StringListNode *ln = missingFiles.first; 1329 while (ln != NULL) { 1330 StringListNode *next = ln->next; 1331 if (path_starts_with(ln->datum, p)) { 1332 free(ln->datum); 1333 Lst_Remove(&missingFiles, ln); 1334 } 1335 ln = next; 1336 } 1337 } 1338 if (buf[0] == 'M') { 1339 /* the target of the mv is a file 'W'ritten */ 1340 #ifdef DEBUG_META_MODE 1341 DEBUG2(META, "meta_oodate: M %s -> %s\n", 1342 p, move_target); 1343 #endif 1344 p = move_target; 1345 goto check_write; 1346 } 1347 break; 1348 case 'L': /* Link */ 1349 /* 1350 * For 'L'inks check 1351 * the src as for 'R'ead 1352 * and the target as for 'W'rite. 1353 */ 1354 link_src = p; 1355 /* now get target */ 1356 if (strsep(&p, " ") == NULL) 1357 continue; 1358 CHECK_VALID_META(p); 1359 /* 'L' and 'M' put single quotes around the args */ 1360 DEQUOTE(p); 1361 DEQUOTE(link_src); 1362 #ifdef DEBUG_META_MODE 1363 DEBUG2(META, "meta_oodate: L %s -> %s\n", link_src, p); 1364 #endif 1365 /* FALLTHROUGH */ 1366 case 'W': /* Write */ 1367 check_write: 1368 /* 1369 * If a file we generated within our bailiwick 1370 * but outside of .OBJDIR is missing, 1371 * we need to do it again. 1372 */ 1373 /* ignore non-absolute paths */ 1374 if (*p != '/') 1375 break; 1376 1377 if (Lst_IsEmpty(&metaBailiwick)) 1378 break; 1379 1380 /* ignore cwd - normal dependencies handle those */ 1381 if (strncmp(p, cwd, cwdlen) == 0) 1382 break; 1383 1384 if (!has_any_prefix(p, &metaBailiwick)) 1385 break; 1386 1387 /* tmpdir might be within */ 1388 if (tmplen > 0 && strncmp(p, tmpdir, tmplen) == 0) 1389 break; 1390 1391 /* ignore anything containing the string "tmp" */ 1392 /* XXX: The arguments to strstr must be swapped. */ 1393 if (strstr("tmp", p) != NULL) 1394 break; 1395 1396 if ((link_src != NULL && cached_lstat(p, &cst) < 0) || 1397 (link_src == NULL && cached_stat(p, &cst) < 0)) { 1398 if (!meta_ignore(gn, p)) 1399 append_if_new(&missingFiles, p); 1400 } 1401 break; 1402 check_link_src: 1403 p = link_src; 1404 link_src = NULL; 1405 #ifdef DEBUG_META_MODE 1406 DEBUG1(META, "meta_oodate: L src %s\n", p); 1407 #endif 1408 /* FALLTHROUGH */ 1409 case 'R': /* Read */ 1410 case 'E': /* Exec */ 1411 /* 1412 * Check for runtime files that can't 1413 * be part of the dependencies because 1414 * they are _expected_ to change. 1415 */ 1416 if (meta_ignore(gn, p)) 1417 break; 1418 1419 /* 1420 * The rest of the record is the file name. 1421 * Check if it's not an absolute path. 1422 */ 1423 { 1424 char *sdirs[4]; 1425 char **sdp; 1426 int sdx = 0; 1427 Boolean found = FALSE; 1428 1429 if (*p == '/') { 1430 sdirs[sdx++] = p; /* done */ 1431 } else { 1432 if (strcmp(".", p) == 0) 1433 continue; /* no point */ 1434 1435 /* Check vs latestdir */ 1436 snprintf(fname1, sizeof fname1, "%s/%s", latestdir, p); 1437 sdirs[sdx++] = fname1; 1438 1439 if (strcmp(latestdir, lcwd) != 0) { 1440 /* Check vs lcwd */ 1441 snprintf(fname2, sizeof fname2, "%s/%s", lcwd, p); 1442 sdirs[sdx++] = fname2; 1443 } 1444 if (strcmp(lcwd, cwd) != 0) { 1445 /* Check vs cwd */ 1446 snprintf(fname3, sizeof fname3, "%s/%s", cwd, p); 1447 sdirs[sdx++] = fname3; 1448 } 1449 } 1450 sdirs[sdx++] = NULL; 1451 1452 for (sdp = sdirs; *sdp != NULL && !found; sdp++) { 1453 #ifdef DEBUG_META_MODE 1454 DEBUG3(META, "%s: %d: looking for: %s\n", 1455 fname, lineno, *sdp); 1456 #endif 1457 if (cached_stat(*sdp, &cst) == 0) { 1458 found = TRUE; 1459 p = *sdp; 1460 } 1461 } 1462 if (found) { 1463 #ifdef DEBUG_META_MODE 1464 DEBUG3(META, "%s: %d: found: %s\n", 1465 fname, lineno, p); 1466 #endif 1467 if (!S_ISDIR(cst.cst_mode) && 1468 cst.cst_mtime > gn->mtime) { 1469 DEBUG3(META, "%s: %d: file '%s' is newer than the target...\n", 1470 fname, lineno, p); 1471 oodate = TRUE; 1472 } else if (S_ISDIR(cst.cst_mode)) { 1473 /* Update the latest directory. */ 1474 cached_realpath(p, latestdir); 1475 } 1476 } else if (errno == ENOENT && *p == '/' && 1477 strncmp(p, cwd, cwdlen) != 0) { 1478 /* 1479 * A referenced file outside of CWD is missing. 1480 * We cannot catch every eventuality here... 1481 */ 1482 append_if_new(&missingFiles, p); 1483 } 1484 } 1485 if (buf[0] == 'E') { 1486 /* previous latestdir is no longer relevant */ 1487 strlcpy(latestdir, lcwd, sizeof latestdir); 1488 } 1489 break; 1490 default: 1491 break; 1492 } 1493 if (!oodate && buf[0] == 'L' && link_src != NULL) 1494 goto check_link_src; 1495 } else if (strcmp(buf, "CMD") == 0) { 1496 /* 1497 * Compare the current command with the one in the 1498 * meta data file. 1499 */ 1500 if (cmdNode == NULL) { 1501 DEBUG2(META, "%s: %d: there were more build commands in the meta data file than there are now...\n", 1502 fname, lineno); 1503 oodate = TRUE; 1504 } else { 1505 const char *cp; 1506 char *cmd = cmdNode->datum; 1507 Boolean hasOODATE = FALSE; 1508 1509 if (strstr(cmd, "$?") != NULL) 1510 hasOODATE = TRUE; 1511 else if ((cp = strstr(cmd, ".OODATE")) != NULL) { 1512 /* check for $[{(].OODATE[:)}] */ 1513 if (cp > cmd + 2 && cp[-2] == '$') 1514 hasOODATE = TRUE; 1515 } 1516 if (hasOODATE) { 1517 needOODATE = TRUE; 1518 DEBUG2(META, "%s: %d: cannot compare command using .OODATE\n", 1519 fname, lineno); 1520 } 1521 (void)Var_Subst(cmd, gn, VARE_WANTRES|VARE_UNDEFERR, &cmd); 1522 /* TODO: handle errors */ 1523 1524 if ((cp = strchr(cmd, '\n')) != NULL) { 1525 int n; 1526 1527 /* 1528 * This command contains newlines, we need to 1529 * fetch more from the .meta file before we 1530 * attempt a comparison. 1531 */ 1532 /* first put the newline back at buf[x - 1] */ 1533 buf[x - 1] = '\n'; 1534 do { 1535 /* now fetch the next line */ 1536 if ((n = fgetLine(&buf, &bufsz, x, fp)) <= 0) 1537 break; 1538 x = n; 1539 lineno++; 1540 if (buf[x - 1] != '\n') { 1541 warnx("%s: %d: line truncated at %u", fname, lineno, x); 1542 break; 1543 } 1544 cp = strchr(cp + 1, '\n'); 1545 } while (cp != NULL); 1546 if (buf[x - 1] == '\n') 1547 buf[x - 1] = '\0'; 1548 } 1549 if (p != NULL && 1550 !hasOODATE && 1551 !(gn->type & OP_NOMETA_CMP) && 1552 (strcmp(p, cmd) != 0)) { 1553 DEBUG4(META, "%s: %d: a build command has changed\n%s\nvs\n%s\n", 1554 fname, lineno, p, cmd); 1555 if (!metaIgnoreCMDs) 1556 oodate = TRUE; 1557 } 1558 free(cmd); 1559 cmdNode = cmdNode->next; 1560 } 1561 } else if (strcmp(buf, "CWD") == 0) { 1562 /* 1563 * Check if there are extra commands now 1564 * that weren't in the meta data file. 1565 */ 1566 if (!oodate && cmdNode != NULL) { 1567 DEBUG2(META, "%s: %d: there are extra build commands now that weren't in the meta data file\n", 1568 fname, lineno); 1569 oodate = TRUE; 1570 } 1571 CHECK_VALID_META(p); 1572 if (strcmp(p, cwd) != 0) { 1573 DEBUG4(META, "%s: %d: the current working directory has changed from '%s' to '%s'\n", 1574 fname, lineno, p, curdir); 1575 oodate = TRUE; 1576 } 1577 } 1578 } 1579 1580 fclose(fp); 1581 if (!Lst_IsEmpty(&missingFiles)) { 1582 DEBUG2(META, "%s: missing files: %s...\n", 1583 fname, (char *)missingFiles.first->datum); 1584 oodate = TRUE; 1585 } 1586 if (!oodate && !have_filemon && filemonMissing) { 1587 DEBUG1(META, "%s: missing filemon data\n", fname); 1588 oodate = TRUE; 1589 } 1590 } else { 1591 if (writeMeta && (metaMissing || (gn->type & OP_META))) { 1592 const char *cp = NULL; 1593 1594 /* if target is in .CURDIR we do not need a meta file */ 1595 if (gn->path != NULL && (cp = strrchr(gn->path, '/')) != NULL && 1596 (cp > gn->path)) { 1597 if (strncmp(curdir, gn->path, (size_t)(cp - gn->path)) != 0) { 1598 cp = NULL; /* not in .CURDIR */ 1599 } 1600 } 1601 if (cp == NULL) { 1602 DEBUG1(META, "%s: required but missing\n", fname); 1603 oodate = TRUE; 1604 needOODATE = TRUE; /* assume the worst */ 1605 } 1606 } 1607 } 1608 1609 Lst_DoneCall(&missingFiles, free); 1610 1611 if (oodate && needOODATE) { 1612 /* 1613 * Target uses .OODATE which is empty; or we wouldn't be here. 1614 * We have decided it is oodate, so .OODATE needs to be set. 1615 * All we can sanely do is set it to .ALLSRC. 1616 */ 1617 Var_Delete(gn, OODATE); 1618 Var_Set(gn, OODATE, GNode_VarAllsrc(gn)); 1619 } 1620 1621 oodate_out: 1622 FStr_Done(&dname); 1623 return oodate; 1624 } 1625 1626 /* support for compat mode */ 1627 1628 static int childPipe[2]; 1629 1630 void 1631 meta_compat_start(void) 1632 { 1633 #ifdef USE_FILEMON_ONCE 1634 /* 1635 * We need to re-open filemon for each cmd. 1636 */ 1637 BuildMon *pbm = &Mybm; 1638 1639 if (pbm->mfp != NULL && useFilemon) { 1640 meta_open_filemon(pbm); 1641 } else { 1642 pbm->mon_fd = -1; 1643 pbm->filemon = NULL; 1644 } 1645 #endif 1646 if (pipe(childPipe) < 0) 1647 Punt("Cannot create pipe: %s", strerror(errno)); 1648 /* Set close-on-exec flag for both */ 1649 (void)fcntl(childPipe[0], F_SETFD, FD_CLOEXEC); 1650 (void)fcntl(childPipe[1], F_SETFD, FD_CLOEXEC); 1651 } 1652 1653 void 1654 meta_compat_child(void) 1655 { 1656 meta_job_child(NULL); 1657 if (dup2(childPipe[1], 1) < 0 || dup2(1, 2) < 0) 1658 execDie("dup2", "pipe"); 1659 } 1660 1661 void 1662 meta_compat_parent(pid_t child) 1663 { 1664 int outfd, metafd, maxfd, nfds; 1665 char buf[BUFSIZ+1]; 1666 fd_set readfds; 1667 1668 meta_job_parent(NULL, child); 1669 close(childPipe[1]); /* child side */ 1670 outfd = childPipe[0]; 1671 #ifdef USE_FILEMON 1672 metafd = Mybm.filemon != NULL ? filemon_readfd(Mybm.filemon) : -1; 1673 #else 1674 metafd = -1; 1675 #endif 1676 maxfd = -1; 1677 if (outfd > maxfd) 1678 maxfd = outfd; 1679 if (metafd > maxfd) 1680 maxfd = metafd; 1681 1682 while (outfd != -1 || metafd != -1) { 1683 FD_ZERO(&readfds); 1684 if (outfd != -1) { 1685 FD_SET(outfd, &readfds); 1686 } 1687 if (metafd != -1) { 1688 FD_SET(metafd, &readfds); 1689 } 1690 nfds = select(maxfd + 1, &readfds, NULL, NULL, NULL); 1691 if (nfds == -1) { 1692 if (errno == EINTR) 1693 continue; 1694 err(1, "select"); 1695 } 1696 1697 if (outfd != -1 && FD_ISSET(outfd, &readfds) != 0) do { 1698 /* XXX this is not line-buffered */ 1699 ssize_t nread = read(outfd, buf, sizeof buf - 1); 1700 if (nread == -1) 1701 err(1, "read"); 1702 if (nread == 0) { 1703 close(outfd); 1704 outfd = -1; 1705 break; 1706 } 1707 fwrite(buf, 1, (size_t)nread, stdout); 1708 fflush(stdout); 1709 buf[nread] = '\0'; 1710 meta_job_output(NULL, buf, ""); 1711 } while (/*CONSTCOND*/FALSE); 1712 if (metafd != -1 && FD_ISSET(metafd, &readfds) != 0) { 1713 if (meta_job_event(NULL) <= 0) 1714 metafd = -1; 1715 } 1716 } 1717 } 1718 1719 #endif /* USE_META */ 1720