1 /* $NetBSD: meta.c,v 1.67 2016/08/17 15:52:42 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 #include <sys/ioctl.h> 40 #ifdef HAVE_LIBGEN_H 41 #include <libgen.h> 42 #elif !defined(HAVE_DIRNAME) 43 char * dirname(char *); 44 #endif 45 #include <errno.h> 46 #if !defined(HAVE_CONFIG_H) || defined(HAVE_ERR_H) 47 #include <err.h> 48 #endif 49 50 #include "make.h" 51 #include "job.h" 52 53 #ifdef HAVE_FILEMON_H 54 # include <filemon.h> 55 #endif 56 #if !defined(USE_FILEMON) && defined(FILEMON_SET_FD) 57 # define USE_FILEMON 58 #endif 59 60 static BuildMon Mybm; /* for compat */ 61 static Lst metaBailiwick; /* our scope of control */ 62 static char *metaBailiwickStr; /* string storage for the list */ 63 static Lst metaIgnorePaths; /* paths we deliberately ignore */ 64 static char *metaIgnorePathsStr; /* string storage for the list */ 65 66 #ifndef MAKE_META_IGNORE_PATHS 67 #define MAKE_META_IGNORE_PATHS ".MAKE.META.IGNORE_PATHS" 68 #endif 69 #ifndef MAKE_META_IGNORE_PATTERNS 70 #define MAKE_META_IGNORE_PATTERNS ".MAKE.META.IGNORE_PATTERNS" 71 #endif 72 #ifndef MAKE_META_IGNORE_FILTER 73 #define MAKE_META_IGNORE_FILTER ".MAKE.META.IGNORE_FILTER" 74 #endif 75 76 Boolean useMeta = FALSE; 77 static Boolean useFilemon = FALSE; 78 static Boolean writeMeta = FALSE; 79 static Boolean metaMissing = FALSE; /* oodate if missing */ 80 static Boolean filemonMissing = FALSE; /* oodate if missing */ 81 static Boolean metaEnv = FALSE; /* don't save env unless asked */ 82 static Boolean metaVerbose = FALSE; 83 static Boolean metaIgnoreCMDs = FALSE; /* ignore CMDs in .meta files */ 84 static Boolean metaIgnorePatterns = FALSE; /* do we need to do pattern matches */ 85 static Boolean metaIgnoreFilter = FALSE; /* do we have more complex filtering? */ 86 static Boolean metaCurdirOk = FALSE; /* write .meta in .CURDIR Ok? */ 87 static Boolean metaSilent = FALSE; /* if we have a .meta be SILENT */ 88 89 extern Boolean forceJobs; 90 extern Boolean comatMake; 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 105 106 /* 107 * Filemon is a kernel module which snoops certain syscalls. 108 * 109 * C chdir 110 * E exec 111 * F [v]fork 112 * L [sym]link 113 * M rename 114 * R read 115 * W write 116 * S stat 117 * 118 * See meta_oodate below - we mainly care about 'E' and 'R'. 119 * 120 * We can still use meta mode without filemon, but 121 * the benefits are more limited. 122 */ 123 #ifdef USE_FILEMON 124 # ifndef _PATH_FILEMON 125 # define _PATH_FILEMON "/dev/filemon" 126 # endif 127 128 /* 129 * Open the filemon device. 130 */ 131 static void 132 filemon_open(BuildMon *pbm) 133 { 134 int retry; 135 136 pbm->mon_fd = pbm->filemon_fd = -1; 137 if (!useFilemon) 138 return; 139 140 for (retry = 5; retry >= 0; retry--) { 141 if ((pbm->filemon_fd = open(_PATH_FILEMON, O_RDWR)) >= 0) 142 break; 143 } 144 145 if (pbm->filemon_fd < 0) { 146 useFilemon = FALSE; 147 warn("Could not open %s", _PATH_FILEMON); 148 return; 149 } 150 151 /* 152 * We use a file outside of '.' 153 * to avoid a FreeBSD kernel bug where unlink invalidates 154 * cwd causing getcwd to do a lot more work. 155 * We only care about the descriptor. 156 */ 157 pbm->mon_fd = mkTempFile("filemon.XXXXXX", NULL); 158 if (ioctl(pbm->filemon_fd, FILEMON_SET_FD, &pbm->mon_fd) < 0) { 159 err(1, "Could not set filemon file descriptor!"); 160 } 161 /* we don't need these once we exec */ 162 (void)fcntl(pbm->mon_fd, F_SETFD, FD_CLOEXEC); 163 (void)fcntl(pbm->filemon_fd, F_SETFD, FD_CLOEXEC); 164 } 165 166 /* 167 * Read the build monitor output file and write records to the target's 168 * metadata file. 169 */ 170 static int 171 filemon_read(FILE *mfp, int fd) 172 { 173 char buf[BUFSIZ]; 174 int n; 175 int error; 176 177 /* Check if we're not writing to a meta data file.*/ 178 if (mfp == NULL) { 179 if (fd >= 0) 180 close(fd); /* not interested */ 181 return 0; 182 } 183 /* rewind */ 184 (void)lseek(fd, (off_t)0, SEEK_SET); 185 186 error = 0; 187 fprintf(mfp, "\n-- filemon acquired metadata --\n"); 188 189 while ((n = read(fd, buf, sizeof(buf))) > 0) { 190 if ((int)fwrite(buf, 1, n, mfp) < n) 191 error = EIO; 192 } 193 fflush(mfp); 194 if (close(fd) < 0) 195 error = errno; 196 return error; 197 } 198 #endif 199 200 /* 201 * when realpath() fails, 202 * we use this, to clean up ./ and ../ 203 */ 204 static void 205 eat_dots(char *buf, size_t bufsz, int dots) 206 { 207 char *cp; 208 char *cp2; 209 const char *eat; 210 size_t eatlen; 211 212 switch (dots) { 213 case 1: 214 eat = "/./"; 215 eatlen = 2; 216 break; 217 case 2: 218 eat = "/../"; 219 eatlen = 3; 220 break; 221 default: 222 return; 223 } 224 225 do { 226 cp = strstr(buf, eat); 227 if (cp) { 228 cp2 = cp + eatlen; 229 if (dots == 2 && cp > buf) { 230 do { 231 cp--; 232 } while (cp > buf && *cp != '/'); 233 } 234 if (*cp == '/') { 235 strlcpy(cp, cp2, bufsz - (cp - buf)); 236 } else { 237 return; /* can't happen? */ 238 } 239 } 240 } while (cp); 241 } 242 243 static char * 244 meta_name(struct GNode *gn, char *mname, size_t mnamelen, 245 const char *dname, 246 const char *tname, 247 const char *cwd) 248 { 249 char buf[MAXPATHLEN]; 250 char *rp; 251 char *cp; 252 char *tp; 253 254 /* 255 * Weed out relative paths from the target file name. 256 * We have to be careful though since if target is a 257 * symlink, the result will be unstable. 258 * So we use realpath() just to get the dirname, and leave the 259 * basename as given to us. 260 */ 261 if ((cp = strrchr(tname, '/'))) { 262 if (cached_realpath(tname, buf)) { 263 if ((rp = strrchr(buf, '/'))) { 264 rp++; 265 cp++; 266 if (strcmp(cp, rp) != 0) 267 strlcpy(rp, cp, sizeof(buf) - (rp - buf)); 268 } 269 tname = buf; 270 } else { 271 /* 272 * We likely have a directory which is about to be made. 273 * We pretend realpath() succeeded, to have a chance 274 * of generating the same meta file name that we will 275 * next time through. 276 */ 277 if (tname[0] == '/') { 278 strlcpy(buf, tname, sizeof(buf)); 279 } else { 280 snprintf(buf, sizeof(buf), "%s/%s", cwd, tname); 281 } 282 eat_dots(buf, sizeof(buf), 1); /* ./ */ 283 eat_dots(buf, sizeof(buf), 2); /* ../ */ 284 tname = buf; 285 } 286 } 287 /* on some systems dirname may modify its arg */ 288 tp = bmake_strdup(tname); 289 if (strcmp(dname, dirname(tp)) == 0) 290 snprintf(mname, mnamelen, "%s.meta", tname); 291 else { 292 snprintf(mname, mnamelen, "%s/%s.meta", dname, tname); 293 294 /* 295 * Replace path separators in the file name after the 296 * current object directory path. 297 */ 298 cp = mname + strlen(dname) + 1; 299 300 while (*cp != '\0') { 301 if (*cp == '/') 302 *cp = '_'; 303 cp++; 304 } 305 } 306 free(tp); 307 return (mname); 308 } 309 310 /* 311 * Return true if running ${.MAKE} 312 * Bypassed if target is flagged .MAKE 313 */ 314 static int 315 is_submake(void *cmdp, void *gnp) 316 { 317 static char *p_make = NULL; 318 static int p_len; 319 char *cmd = cmdp; 320 GNode *gn = gnp; 321 char *mp = NULL; 322 char *cp; 323 char *cp2; 324 int rc = 0; /* keep looking */ 325 326 if (!p_make) { 327 p_make = Var_Value(".MAKE", gn, &cp); 328 p_len = strlen(p_make); 329 } 330 cp = strchr(cmd, '$'); 331 if ((cp)) { 332 mp = Var_Subst(NULL, cmd, gn, VARF_WANTRES); 333 cmd = mp; 334 } 335 cp2 = strstr(cmd, p_make); 336 if ((cp2)) { 337 switch (cp2[p_len]) { 338 case '\0': 339 case ' ': 340 case '\t': 341 case '\n': 342 rc = 1; 343 break; 344 } 345 if (cp2 > cmd && rc > 0) { 346 switch (cp2[-1]) { 347 case ' ': 348 case '\t': 349 case '\n': 350 break; 351 default: 352 rc = 0; /* no match */ 353 break; 354 } 355 } 356 } 357 free(mp); 358 return (rc); 359 } 360 361 typedef struct meta_file_s { 362 FILE *fp; 363 GNode *gn; 364 } meta_file_t; 365 366 static int 367 printCMD(void *cmdp, void *mfpp) 368 { 369 meta_file_t *mfp = mfpp; 370 char *cmd = cmdp; 371 char *cp = NULL; 372 373 if (strchr(cmd, '$')) { 374 cmd = cp = Var_Subst(NULL, cmd, mfp->gn, VARF_WANTRES); 375 } 376 fprintf(mfp->fp, "CMD %s\n", cmd); 377 free(cp); 378 return 0; 379 } 380 381 /* 382 * Certain node types never get a .meta file 383 */ 384 #define SKIP_META_TYPE(_type) do { \ 385 if ((gn->type & __CONCAT(OP_, _type))) { \ 386 if (verbose) { \ 387 fprintf(debug_file, "Skipping meta for %s: .%s\n", \ 388 gn->name, __STRING(_type)); \ 389 } \ 390 return FALSE; \ 391 } \ 392 } while (0) 393 394 395 /* 396 * Do we need/want a .meta file ? 397 */ 398 static Boolean 399 meta_needed(GNode *gn, const char *dname, const char *tname, 400 char *objdir, int verbose) 401 { 402 struct stat fs; 403 404 if (verbose) 405 verbose = DEBUG(META); 406 407 /* This may be a phony node which we don't want meta data for... */ 408 /* Skip .meta for .BEGIN, .END, .ERROR etc as well. */ 409 /* Or it may be explicitly flagged as .NOMETA */ 410 SKIP_META_TYPE(NOMETA); 411 /* Unless it is explicitly flagged as .META */ 412 if (!(gn->type & OP_META)) { 413 SKIP_META_TYPE(PHONY); 414 SKIP_META_TYPE(SPECIAL); 415 SKIP_META_TYPE(MAKE); 416 } 417 418 /* Check if there are no commands to execute. */ 419 if (Lst_IsEmpty(gn->commands)) { 420 if (verbose) 421 fprintf(debug_file, "Skipping meta for %s: no commands\n", 422 gn->name); 423 return FALSE; 424 } 425 if ((gn->type & (OP_META|OP_SUBMAKE)) == OP_SUBMAKE) { 426 /* OP_SUBMAKE is a bit too aggressive */ 427 if (Lst_ForEach(gn->commands, is_submake, gn)) { 428 if (DEBUG(META)) 429 fprintf(debug_file, "Skipping meta for %s: .SUBMAKE\n", 430 gn->name); 431 return FALSE; 432 } 433 } 434 435 /* The object directory may not exist. Check it.. */ 436 if (cached_stat(dname, &fs) != 0) { 437 if (verbose) 438 fprintf(debug_file, "Skipping meta for %s: no .OBJDIR\n", 439 gn->name); 440 return FALSE; 441 } 442 443 /* make sure these are canonical */ 444 if (cached_realpath(dname, objdir)) 445 dname = objdir; 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 fprintf(debug_file, "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 meta_file_t mf; 462 char buf[MAXPATHLEN]; 463 char objdir[MAXPATHLEN]; 464 char **ptr; 465 const char *dname; 466 const char *tname; 467 char *fname; 468 const char *cp; 469 char *p[4]; /* >= possible uses */ 470 int i; 471 472 mf.fp = NULL; 473 i = 0; 474 475 dname = Var_Value(".OBJDIR", gn, &p[i++]); 476 tname = Var_Value(TARGET, gn, &p[i++]); 477 478 /* if this succeeds objdir is realpath of dname */ 479 if (!meta_needed(gn, dname, tname, objdir, TRUE)) 480 goto out; 481 dname = objdir; 482 483 if (metaVerbose) { 484 char *mp; 485 486 /* Describe the target we are building */ 487 mp = Var_Subst(NULL, "${" MAKE_META_PREFIX "}", gn, VARF_WANTRES); 488 if (*mp) 489 fprintf(stdout, "%s\n", mp); 490 free(mp); 491 } 492 /* Get the basename of the target */ 493 if ((cp = strrchr(tname, '/')) == NULL) { 494 cp = tname; 495 } else { 496 cp++; 497 } 498 499 fflush(stdout); 500 501 if (!writeMeta) 502 /* Don't create meta data. */ 503 goto out; 504 505 fname = meta_name(gn, pbm->meta_fname, sizeof(pbm->meta_fname), 506 dname, tname, objdir); 507 508 #ifdef DEBUG_META_MODE 509 if (DEBUG(META)) 510 fprintf(debug_file, "meta_create: %s\n", fname); 511 #endif 512 513 if ((mf.fp = fopen(fname, "w")) == NULL) 514 err(1, "Could not open meta file '%s'", fname); 515 516 fprintf(mf.fp, "# Meta data file %s\n", fname); 517 518 mf.gn = gn; 519 520 Lst_ForEach(gn->commands, printCMD, &mf); 521 522 fprintf(mf.fp, "CWD %s\n", getcwd(buf, sizeof(buf))); 523 fprintf(mf.fp, "TARGET %s\n", tname); 524 525 if (metaEnv) { 526 for (ptr = environ; *ptr != NULL; ptr++) 527 fprintf(mf.fp, "ENV %s\n", *ptr); 528 } 529 530 fprintf(mf.fp, "-- command output --\n"); 531 fflush(mf.fp); 532 533 Var_Append(".MAKE.META.FILES", fname, VAR_GLOBAL); 534 Var_Append(".MAKE.META.CREATED", fname, VAR_GLOBAL); 535 536 gn->type |= OP_META; /* in case anyone wants to know */ 537 if (metaSilent) { 538 gn->type |= OP_SILENT; 539 } 540 out: 541 for (i--; i >= 0; i--) { 542 free(p[i]); 543 } 544 545 return (mf.fp); 546 } 547 548 static Boolean 549 boolValue(char *s) 550 { 551 switch(*s) { 552 case '0': 553 case 'N': 554 case 'n': 555 case 'F': 556 case 'f': 557 return FALSE; 558 } 559 return TRUE; 560 } 561 562 /* 563 * Initialization we need before reading makefiles. 564 */ 565 void 566 meta_init(void) 567 { 568 #ifdef USE_FILEMON 569 /* this allows makefiles to test if we have filemon support */ 570 Var_Set(".MAKE.PATH_FILEMON", _PATH_FILEMON, VAR_GLOBAL, 0); 571 #endif 572 } 573 574 575 #define get_mode_bf(bf, token) \ 576 if ((cp = strstr(make_mode, token))) \ 577 bf = boolValue(&cp[sizeof(token) - 1]) 578 579 /* 580 * Initialization we need after reading makefiles. 581 */ 582 void 583 meta_mode_init(const char *make_mode) 584 { 585 static int once = 0; 586 char *cp; 587 588 useMeta = TRUE; 589 useFilemon = TRUE; 590 writeMeta = TRUE; 591 592 if (make_mode) { 593 if (strstr(make_mode, "env")) 594 metaEnv = TRUE; 595 if (strstr(make_mode, "verb")) 596 metaVerbose = TRUE; 597 if (strstr(make_mode, "read")) 598 writeMeta = FALSE; 599 if (strstr(make_mode, "nofilemon")) 600 useFilemon = FALSE; 601 if (strstr(make_mode, "ignore-cmd")) 602 metaIgnoreCMDs = TRUE; 603 if (useFilemon) 604 get_mode_bf(filemonMissing, "missing-filemon="); 605 get_mode_bf(metaCurdirOk, "curdirok="); 606 get_mode_bf(metaMissing, "missing-meta="); 607 get_mode_bf(metaSilent, "silent="); 608 } 609 if (metaVerbose && !Var_Exists(MAKE_META_PREFIX, VAR_GLOBAL)) { 610 /* 611 * The default value for MAKE_META_PREFIX 612 * prints the absolute path of the target. 613 * This works be cause :H will generate '.' if there is no / 614 * and :tA will resolve that to cwd. 615 */ 616 Var_Set(MAKE_META_PREFIX, "Building ${.TARGET:H:tA}/${.TARGET:T}", VAR_GLOBAL, 0); 617 } 618 if (once) 619 return; 620 once = 1; 621 memset(&Mybm, 0, sizeof(Mybm)); 622 /* 623 * We consider ourselves master of all within ${.MAKE.META.BAILIWICK} 624 */ 625 metaBailiwick = Lst_Init(FALSE); 626 metaBailiwickStr = Var_Subst(NULL, "${.MAKE.META.BAILIWICK:O:u:tA}", 627 VAR_GLOBAL, VARF_WANTRES); 628 if (metaBailiwickStr) { 629 str2Lst_Append(metaBailiwick, metaBailiwickStr, NULL); 630 } 631 /* 632 * We ignore any paths that start with ${.MAKE.META.IGNORE_PATHS} 633 */ 634 metaIgnorePaths = Lst_Init(FALSE); 635 Var_Append(MAKE_META_IGNORE_PATHS, 636 "/dev /etc /proc /tmp /var/run /var/tmp ${TMPDIR}", VAR_GLOBAL); 637 metaIgnorePathsStr = Var_Subst(NULL, 638 "${" MAKE_META_IGNORE_PATHS ":O:u:tA}", VAR_GLOBAL, 639 VARF_WANTRES); 640 if (metaIgnorePathsStr) { 641 str2Lst_Append(metaIgnorePaths, metaIgnorePathsStr, NULL); 642 } 643 644 /* 645 * We ignore any paths that match ${.MAKE.META.IGNORE_PATTERNS} 646 */ 647 cp = NULL; 648 if (Var_Value(MAKE_META_IGNORE_PATTERNS, VAR_GLOBAL, &cp)) { 649 metaIgnorePatterns = TRUE; 650 free(cp); 651 } 652 cp = NULL; 653 if (Var_Value(MAKE_META_IGNORE_FILTER, VAR_GLOBAL, &cp)) { 654 metaIgnoreFilter = TRUE; 655 free(cp); 656 } 657 } 658 659 /* 660 * In each case below we allow for job==NULL 661 */ 662 void 663 meta_job_start(Job *job, GNode *gn) 664 { 665 BuildMon *pbm; 666 667 if (job != NULL) { 668 pbm = &job->bm; 669 } else { 670 pbm = &Mybm; 671 } 672 pbm->mfp = meta_create(pbm, gn); 673 #ifdef USE_FILEMON_ONCE 674 /* compat mode we open the filemon dev once per command */ 675 if (job == NULL) 676 return; 677 #endif 678 #ifdef USE_FILEMON 679 if (pbm->mfp != NULL && useFilemon) { 680 filemon_open(pbm); 681 } else { 682 pbm->mon_fd = pbm->filemon_fd = -1; 683 } 684 #endif 685 } 686 687 /* 688 * The child calls this before doing anything. 689 * It does not disturb our state. 690 */ 691 void 692 meta_job_child(Job *job) 693 { 694 #ifdef USE_FILEMON 695 BuildMon *pbm; 696 697 if (job != NULL) { 698 pbm = &job->bm; 699 } else { 700 pbm = &Mybm; 701 } 702 if (pbm->mfp != NULL) { 703 close(fileno(pbm->mfp)); 704 if (useFilemon) { 705 pid_t pid; 706 707 pid = getpid(); 708 if (ioctl(pbm->filemon_fd, FILEMON_SET_PID, &pid) < 0) { 709 err(1, "Could not set filemon pid!"); 710 } 711 } 712 } 713 #endif 714 } 715 716 void 717 meta_job_error(Job *job, GNode *gn, int flags, int status) 718 { 719 char cwd[MAXPATHLEN]; 720 BuildMon *pbm; 721 722 if (job != NULL) { 723 pbm = &job->bm; 724 if (!gn) 725 gn = job->node; 726 } else { 727 pbm = &Mybm; 728 } 729 if (pbm->mfp != NULL) { 730 fprintf(pbm->mfp, "*** Error code %d%s\n", 731 status, 732 (flags & JOB_IGNERR) ? 733 "(ignored)" : ""); 734 } 735 if (gn) { 736 Var_Set(".ERROR_TARGET", gn->path ? gn->path : gn->name, VAR_GLOBAL, 0); 737 } 738 getcwd(cwd, sizeof(cwd)); 739 Var_Set(".ERROR_CWD", cwd, VAR_GLOBAL, 0); 740 if (pbm->meta_fname[0]) { 741 Var_Set(".ERROR_META_FILE", pbm->meta_fname, VAR_GLOBAL, 0); 742 } 743 meta_job_finish(job); 744 } 745 746 void 747 meta_job_output(Job *job, char *cp, const char *nl) 748 { 749 BuildMon *pbm; 750 751 if (job != NULL) { 752 pbm = &job->bm; 753 } else { 754 pbm = &Mybm; 755 } 756 if (pbm->mfp != NULL) { 757 if (metaVerbose) { 758 static char *meta_prefix = NULL; 759 static int meta_prefix_len; 760 761 if (!meta_prefix) { 762 char *cp2; 763 764 meta_prefix = Var_Subst(NULL, "${" MAKE_META_PREFIX "}", 765 VAR_GLOBAL, VARF_WANTRES); 766 if ((cp2 = strchr(meta_prefix, '$'))) 767 meta_prefix_len = cp2 - meta_prefix; 768 else 769 meta_prefix_len = strlen(meta_prefix); 770 } 771 if (strncmp(cp, meta_prefix, meta_prefix_len) == 0) { 772 cp = strchr(cp+1, '\n'); 773 if (!cp++) 774 return; 775 } 776 } 777 fprintf(pbm->mfp, "%s%s", cp, nl); 778 } 779 } 780 781 int 782 meta_cmd_finish(void *pbmp) 783 { 784 int error = 0; 785 #ifdef USE_FILEMON 786 BuildMon *pbm = pbmp; 787 int x; 788 789 if (!pbm) 790 pbm = &Mybm; 791 792 if (pbm->filemon_fd >= 0) { 793 if (close(pbm->filemon_fd) < 0) 794 error = errno; 795 x = filemon_read(pbm->mfp, pbm->mon_fd); 796 if (error == 0 && x != 0) 797 error = x; 798 pbm->filemon_fd = pbm->mon_fd = -1; 799 } 800 #endif 801 return error; 802 } 803 804 int 805 meta_job_finish(Job *job) 806 { 807 BuildMon *pbm; 808 int error = 0; 809 int x; 810 811 if (job != NULL) { 812 pbm = &job->bm; 813 } else { 814 pbm = &Mybm; 815 } 816 if (pbm->mfp != NULL) { 817 error = meta_cmd_finish(pbm); 818 x = fclose(pbm->mfp); 819 if (error == 0 && x != 0) 820 error = errno; 821 pbm->mfp = NULL; 822 pbm->meta_fname[0] = '\0'; 823 } 824 return error; 825 } 826 827 void 828 meta_finish(void) 829 { 830 Lst_Destroy(metaBailiwick, NULL); 831 free(metaBailiwickStr); 832 Lst_Destroy(metaIgnorePaths, NULL); 833 free(metaIgnorePathsStr); 834 } 835 836 /* 837 * Fetch a full line from fp - growing bufp if needed 838 * Return length in bufp. 839 */ 840 static int 841 fgetLine(char **bufp, size_t *szp, int o, FILE *fp) 842 { 843 char *buf = *bufp; 844 size_t bufsz = *szp; 845 struct stat fs; 846 int x; 847 848 if (fgets(&buf[o], bufsz - o, fp) != NULL) { 849 check_newline: 850 x = o + strlen(&buf[o]); 851 if (buf[x - 1] == '\n') 852 return x; 853 /* 854 * We need to grow the buffer. 855 * The meta file can give us a clue. 856 */ 857 if (fstat(fileno(fp), &fs) == 0) { 858 size_t newsz; 859 char *p; 860 861 newsz = ROUNDUP((fs.st_size / 2), BUFSIZ); 862 if (newsz <= bufsz) 863 newsz = ROUNDUP(fs.st_size, BUFSIZ); 864 if (DEBUG(META)) 865 fprintf(debug_file, "growing buffer %u -> %u\n", 866 (unsigned)bufsz, (unsigned)newsz); 867 p = bmake_realloc(buf, newsz); 868 if (p) { 869 *bufp = buf = p; 870 *szp = bufsz = newsz; 871 /* fetch the rest */ 872 if (!fgets(&buf[x], bufsz - x, fp)) 873 return x; /* truncated! */ 874 goto check_newline; 875 } 876 } 877 } 878 return 0; 879 } 880 881 /* Lst_ForEach wants 1 to stop search */ 882 static int 883 prefix_match(void *p, void *q) 884 { 885 const char *prefix = p; 886 const char *path = q; 887 size_t n = strlen(prefix); 888 889 return (0 == strncmp(path, prefix, n)); 890 } 891 892 /* 893 * looking for exact or prefix/ match to 894 * Lst_Find wants 0 to stop search 895 */ 896 static int 897 path_match(const void *p, const void *q) 898 { 899 const char *prefix = q; 900 const char *path = p; 901 size_t n = strlen(prefix); 902 int rc; 903 904 if ((rc = strncmp(path, prefix, n)) == 0) { 905 switch (path[n]) { 906 case '\0': 907 case '/': 908 break; 909 default: 910 rc = 1; 911 break; 912 } 913 } 914 return rc; 915 } 916 917 /* Lst_Find wants 0 to stop search */ 918 static int 919 string_match(const void *p, const void *q) 920 { 921 const char *p1 = p; 922 const char *p2 = q; 923 924 return strcmp(p1, p2); 925 } 926 927 928 static int 929 meta_ignore(GNode *gn, const char *p) 930 { 931 char fname[MAXPATHLEN]; 932 933 if (p == NULL) 934 return TRUE; 935 936 if (*p == '/') { 937 cached_realpath(p, fname); /* clean it up */ 938 if (Lst_ForEach(metaIgnorePaths, prefix_match, fname)) { 939 #ifdef DEBUG_META_MODE 940 if (DEBUG(META)) 941 fprintf(debug_file, "meta_oodate: ignoring path: %s\n", 942 p); 943 #endif 944 return TRUE; 945 } 946 } 947 948 if (metaIgnorePatterns) { 949 char *pm; 950 951 snprintf(fname, sizeof(fname), 952 "${%s:@m@${%s:L:M$m}@}", 953 MAKE_META_IGNORE_PATTERNS, p); 954 pm = Var_Subst(NULL, fname, gn, VARF_WANTRES); 955 if (*pm) { 956 #ifdef DEBUG_META_MODE 957 if (DEBUG(META)) 958 fprintf(debug_file, "meta_oodate: ignoring pattern: %s\n", 959 p); 960 #endif 961 free(pm); 962 return TRUE; 963 } 964 free(pm); 965 } 966 967 if (metaIgnoreFilter) { 968 char *fm; 969 970 /* skip if filter result is empty */ 971 snprintf(fname, sizeof(fname), 972 "${%s:L:${%s:ts:}}", 973 p, MAKE_META_IGNORE_FILTER); 974 fm = Var_Subst(NULL, fname, gn, VARF_WANTRES); 975 if (*fm == '\0') { 976 #ifdef DEBUG_META_MODE 977 if (DEBUG(META)) 978 fprintf(debug_file, "meta_oodate: ignoring filtered: %s\n", 979 p); 980 #endif 981 free(fm); 982 return TRUE; 983 } 984 free(fm); 985 } 986 return FALSE; 987 } 988 989 /* 990 * When running with 'meta' functionality, a target can be out-of-date 991 * if any of the references in its meta data file is more recent. 992 * We have to track the latestdir on a per-process basis. 993 */ 994 #define LCWD_VNAME_FMT ".meta.%d.lcwd" 995 #define LDIR_VNAME_FMT ".meta.%d.ldir" 996 997 /* 998 * It is possible that a .meta file is corrupted, 999 * if we detect this we want to reproduce it. 1000 * Setting oodate TRUE will have that effect. 1001 */ 1002 #define CHECK_VALID_META(p) if (!(p && *p)) { \ 1003 warnx("%s: %d: malformed", fname, lineno); \ 1004 oodate = TRUE; \ 1005 continue; \ 1006 } 1007 1008 #define DEQUOTE(p) if (*p == '\'') { \ 1009 char *ep; \ 1010 p++; \ 1011 if ((ep = strchr(p, '\''))) \ 1012 *ep = '\0'; \ 1013 } 1014 1015 Boolean 1016 meta_oodate(GNode *gn, Boolean oodate) 1017 { 1018 static char *tmpdir = NULL; 1019 static char cwd[MAXPATHLEN]; 1020 char lcwd_vname[64]; 1021 char ldir_vname[64]; 1022 char lcwd[MAXPATHLEN]; 1023 char latestdir[MAXPATHLEN]; 1024 char fname[MAXPATHLEN]; 1025 char fname1[MAXPATHLEN]; 1026 char fname2[MAXPATHLEN]; 1027 char fname3[MAXPATHLEN]; 1028 const char *dname; 1029 const char *tname; 1030 char *p; 1031 char *cp; 1032 char *link_src; 1033 char *move_target; 1034 static size_t cwdlen = 0; 1035 static size_t tmplen = 0; 1036 FILE *fp; 1037 Boolean needOODATE = FALSE; 1038 Lst missingFiles; 1039 char *pa[4]; /* >= possible uses */ 1040 int i; 1041 int have_filemon = FALSE; 1042 1043 if (oodate) 1044 return oodate; /* we're done */ 1045 1046 i = 0; 1047 1048 dname = Var_Value(".OBJDIR", gn, &pa[i++]); 1049 tname = Var_Value(TARGET, gn, &pa[i++]); 1050 1051 /* if this succeeds fname3 is realpath of dname */ 1052 if (!meta_needed(gn, dname, tname, fname3, FALSE)) 1053 goto oodate_out; 1054 dname = fname3; 1055 1056 missingFiles = Lst_Init(FALSE); 1057 1058 /* 1059 * We need to check if the target is out-of-date. This includes 1060 * checking if the expanded command has changed. This in turn 1061 * requires that all variables are set in the same way that they 1062 * would be if the target needs to be re-built. 1063 */ 1064 Make_DoAllVar(gn); 1065 1066 meta_name(gn, fname, sizeof(fname), dname, tname, dname); 1067 1068 #ifdef DEBUG_META_MODE 1069 if (DEBUG(META)) 1070 fprintf(debug_file, "meta_oodate: %s\n", fname); 1071 #endif 1072 1073 if ((fp = fopen(fname, "r")) != NULL) { 1074 static char *buf = NULL; 1075 static size_t bufsz; 1076 int lineno = 0; 1077 int lastpid = 0; 1078 int pid; 1079 int x; 1080 LstNode ln; 1081 struct stat fs; 1082 1083 if (!buf) { 1084 bufsz = 8 * BUFSIZ; 1085 buf = bmake_malloc(bufsz); 1086 } 1087 1088 if (!cwdlen) { 1089 if (getcwd(cwd, sizeof(cwd)) == NULL) 1090 err(1, "Could not get current working directory"); 1091 cwdlen = strlen(cwd); 1092 } 1093 strlcpy(lcwd, cwd, sizeof(lcwd)); 1094 strlcpy(latestdir, cwd, sizeof(latestdir)); 1095 1096 if (!tmpdir) { 1097 tmpdir = getTmpdir(); 1098 tmplen = strlen(tmpdir); 1099 } 1100 1101 /* we want to track all the .meta we read */ 1102 Var_Append(".MAKE.META.FILES", fname, VAR_GLOBAL); 1103 1104 ln = Lst_First(gn->commands); 1105 while (!oodate && (x = fgetLine(&buf, &bufsz, 0, fp)) > 0) { 1106 lineno++; 1107 if (buf[x - 1] == '\n') 1108 buf[x - 1] = '\0'; 1109 else { 1110 warnx("%s: %d: line truncated at %u", fname, lineno, x); 1111 oodate = TRUE; 1112 break; 1113 } 1114 link_src = NULL; 1115 move_target = NULL; 1116 /* Find the start of the build monitor section. */ 1117 if (!have_filemon) { 1118 if (strncmp(buf, "-- filemon", 10) == 0) { 1119 have_filemon = TRUE; 1120 continue; 1121 } 1122 if (strncmp(buf, "# buildmon", 10) == 0) { 1123 have_filemon = TRUE; 1124 continue; 1125 } 1126 } 1127 1128 /* Delimit the record type. */ 1129 p = buf; 1130 #ifdef DEBUG_META_MODE 1131 if (DEBUG(META)) 1132 fprintf(debug_file, "%s: %d: %s\n", fname, lineno, buf); 1133 #endif 1134 strsep(&p, " "); 1135 if (have_filemon) { 1136 /* 1137 * We are in the 'filemon' output section. 1138 * Each record from filemon follows the general form: 1139 * 1140 * <key> <pid> <data> 1141 * 1142 * Where: 1143 * <key> is a single letter, denoting the syscall. 1144 * <pid> is the process that made the syscall. 1145 * <data> is the arguments (of interest). 1146 */ 1147 switch(buf[0]) { 1148 case '#': /* comment */ 1149 case 'V': /* version */ 1150 break; 1151 default: 1152 /* 1153 * We need to track pathnames per-process. 1154 * 1155 * Each process run by make, starts off in the 'CWD' 1156 * recorded in the .meta file, if it chdirs ('C') 1157 * elsewhere we need to track that - but only for 1158 * that process. If it forks ('F'), we initialize 1159 * the child to have the same cwd as its parent. 1160 * 1161 * We also need to track the 'latestdir' of 1162 * interest. This is usually the same as cwd, but 1163 * not if a process is reading directories. 1164 * 1165 * Each time we spot a different process ('pid') 1166 * we save the current value of 'latestdir' in a 1167 * variable qualified by 'lastpid', and 1168 * re-initialize 'latestdir' to any pre-saved 1169 * value for the current 'pid' and 'CWD' if none. 1170 */ 1171 CHECK_VALID_META(p); 1172 pid = atoi(p); 1173 if (pid > 0 && pid != lastpid) { 1174 char *ldir; 1175 char *tp; 1176 1177 if (lastpid > 0) { 1178 /* We need to remember these. */ 1179 Var_Set(lcwd_vname, lcwd, VAR_GLOBAL, 0); 1180 Var_Set(ldir_vname, latestdir, VAR_GLOBAL, 0); 1181 } 1182 snprintf(lcwd_vname, sizeof(lcwd_vname), LCWD_VNAME_FMT, pid); 1183 snprintf(ldir_vname, sizeof(ldir_vname), LDIR_VNAME_FMT, pid); 1184 lastpid = pid; 1185 ldir = Var_Value(ldir_vname, VAR_GLOBAL, &tp); 1186 if (ldir) { 1187 strlcpy(latestdir, ldir, sizeof(latestdir)); 1188 free(tp); 1189 } 1190 ldir = Var_Value(lcwd_vname, VAR_GLOBAL, &tp); 1191 if (ldir) { 1192 strlcpy(lcwd, ldir, sizeof(lcwd)); 1193 free(tp); 1194 } 1195 } 1196 /* Skip past the pid. */ 1197 if (strsep(&p, " ") == NULL) 1198 continue; 1199 #ifdef DEBUG_META_MODE 1200 if (DEBUG(META)) 1201 fprintf(debug_file, "%s: %d: %d: %c: cwd=%s lcwd=%s ldir=%s\n", 1202 fname, lineno, 1203 pid, buf[0], cwd, lcwd, latestdir); 1204 #endif 1205 break; 1206 } 1207 1208 CHECK_VALID_META(p); 1209 1210 /* Process according to record type. */ 1211 switch (buf[0]) { 1212 case 'X': /* eXit */ 1213 Var_Delete(lcwd_vname, VAR_GLOBAL); 1214 Var_Delete(ldir_vname, VAR_GLOBAL); 1215 lastpid = 0; /* no need to save ldir_vname */ 1216 break; 1217 1218 case 'F': /* [v]Fork */ 1219 { 1220 char cldir[64]; 1221 int child; 1222 1223 child = atoi(p); 1224 if (child > 0) { 1225 snprintf(cldir, sizeof(cldir), LCWD_VNAME_FMT, child); 1226 Var_Set(cldir, lcwd, VAR_GLOBAL, 0); 1227 snprintf(cldir, sizeof(cldir), LDIR_VNAME_FMT, child); 1228 Var_Set(cldir, latestdir, VAR_GLOBAL, 0); 1229 #ifdef DEBUG_META_MODE 1230 if (DEBUG(META)) 1231 fprintf(debug_file, "%s: %d: %d: cwd=%s lcwd=%s ldir=%s\n", 1232 fname, lineno, 1233 child, cwd, lcwd, latestdir); 1234 #endif 1235 } 1236 } 1237 break; 1238 1239 case 'C': /* Chdir */ 1240 /* Update lcwd and latest directory. */ 1241 strlcpy(latestdir, p, sizeof(latestdir)); 1242 strlcpy(lcwd, p, sizeof(lcwd)); 1243 Var_Set(lcwd_vname, lcwd, VAR_GLOBAL, 0); 1244 Var_Set(ldir_vname, lcwd, VAR_GLOBAL, 0); 1245 #ifdef DEBUG_META_MODE 1246 if (DEBUG(META)) 1247 fprintf(debug_file, "%s: %d: cwd=%s ldir=%s\n", fname, lineno, cwd, lcwd); 1248 #endif 1249 break; 1250 1251 case 'M': /* renaMe */ 1252 /* 1253 * For 'M'oves we want to check 1254 * the src as for 'R'ead 1255 * and the target as for 'W'rite. 1256 */ 1257 cp = p; /* save this for a second */ 1258 /* now get target */ 1259 if (strsep(&p, " ") == NULL) 1260 continue; 1261 CHECK_VALID_META(p); 1262 move_target = p; 1263 p = cp; 1264 /* 'L' and 'M' put single quotes around the args */ 1265 DEQUOTE(p); 1266 DEQUOTE(move_target); 1267 /* FALLTHROUGH */ 1268 case 'D': /* unlink */ 1269 if (*p == '/' && !Lst_IsEmpty(missingFiles)) { 1270 /* remove any missingFiles entries that match p */ 1271 if ((ln = Lst_Find(missingFiles, p, 1272 path_match)) != NULL) { 1273 LstNode nln; 1274 char *tp; 1275 1276 do { 1277 nln = Lst_FindFrom(missingFiles, Lst_Succ(ln), 1278 p, path_match); 1279 tp = Lst_Datum(ln); 1280 Lst_Remove(missingFiles, ln); 1281 free(tp); 1282 } while ((ln = nln) != NULL); 1283 } 1284 } 1285 if (buf[0] == 'M') { 1286 /* the target of the mv is a file 'W'ritten */ 1287 #ifdef DEBUG_META_MODE 1288 if (DEBUG(META)) 1289 fprintf(debug_file, "meta_oodate: M %s -> %s\n", 1290 p, move_target); 1291 #endif 1292 p = move_target; 1293 goto check_write; 1294 } 1295 break; 1296 case 'L': /* Link */ 1297 /* 1298 * For 'L'inks check 1299 * the src as for 'R'ead 1300 * and the target as for 'W'rite. 1301 */ 1302 link_src = p; 1303 /* now get target */ 1304 if (strsep(&p, " ") == NULL) 1305 continue; 1306 CHECK_VALID_META(p); 1307 /* 'L' and 'M' put single quotes around the args */ 1308 DEQUOTE(p); 1309 DEQUOTE(link_src); 1310 #ifdef DEBUG_META_MODE 1311 if (DEBUG(META)) 1312 fprintf(debug_file, "meta_oodate: L %s -> %s\n", 1313 link_src, p); 1314 #endif 1315 /* FALLTHROUGH */ 1316 case 'W': /* Write */ 1317 check_write: 1318 /* 1319 * If a file we generated within our bailiwick 1320 * but outside of .OBJDIR is missing, 1321 * we need to do it again. 1322 */ 1323 /* ignore non-absolute paths */ 1324 if (*p != '/') 1325 break; 1326 1327 if (Lst_IsEmpty(metaBailiwick)) 1328 break; 1329 1330 /* ignore cwd - normal dependencies handle those */ 1331 if (strncmp(p, cwd, cwdlen) == 0) 1332 break; 1333 1334 if (!Lst_ForEach(metaBailiwick, prefix_match, p)) 1335 break; 1336 1337 /* tmpdir might be within */ 1338 if (tmplen > 0 && strncmp(p, tmpdir, tmplen) == 0) 1339 break; 1340 1341 /* ignore anything containing the string "tmp" */ 1342 if ((strstr("tmp", p))) 1343 break; 1344 1345 if ((link_src != NULL && cached_lstat(p, &fs) < 0) || 1346 (link_src == NULL && cached_stat(p, &fs) < 0)) { 1347 if (!meta_ignore(gn, p)) { 1348 if (Lst_Find(missingFiles, p, string_match) == NULL) 1349 Lst_AtEnd(missingFiles, bmake_strdup(p)); 1350 } 1351 } 1352 break; 1353 check_link_src: 1354 p = link_src; 1355 link_src = NULL; 1356 #ifdef DEBUG_META_MODE 1357 if (DEBUG(META)) 1358 fprintf(debug_file, "meta_oodate: L src %s\n", p); 1359 #endif 1360 /* FALLTHROUGH */ 1361 case 'R': /* Read */ 1362 case 'E': /* Exec */ 1363 /* 1364 * Check for runtime files that can't 1365 * be part of the dependencies because 1366 * they are _expected_ to change. 1367 */ 1368 if (meta_ignore(gn, p)) 1369 break; 1370 1371 /* 1372 * The rest of the record is the file name. 1373 * Check if it's not an absolute path. 1374 */ 1375 { 1376 char *sdirs[4]; 1377 char **sdp; 1378 int sdx = 0; 1379 int found = 0; 1380 1381 if (*p == '/') { 1382 sdirs[sdx++] = p; /* done */ 1383 } else { 1384 if (strcmp(".", p) == 0) 1385 continue; /* no point */ 1386 1387 /* Check vs latestdir */ 1388 snprintf(fname1, sizeof(fname1), "%s/%s", latestdir, p); 1389 sdirs[sdx++] = fname1; 1390 1391 if (strcmp(latestdir, lcwd) != 0) { 1392 /* Check vs lcwd */ 1393 snprintf(fname2, sizeof(fname2), "%s/%s", lcwd, p); 1394 sdirs[sdx++] = fname2; 1395 } 1396 if (strcmp(lcwd, cwd) != 0) { 1397 /* Check vs cwd */ 1398 snprintf(fname3, sizeof(fname3), "%s/%s", cwd, p); 1399 sdirs[sdx++] = fname3; 1400 } 1401 } 1402 sdirs[sdx++] = NULL; 1403 1404 for (sdp = sdirs; *sdp && !found; sdp++) { 1405 #ifdef DEBUG_META_MODE 1406 if (DEBUG(META)) 1407 fprintf(debug_file, "%s: %d: looking for: %s\n", fname, lineno, *sdp); 1408 #endif 1409 if (cached_stat(*sdp, &fs) == 0) { 1410 found = 1; 1411 p = *sdp; 1412 } 1413 } 1414 if (found) { 1415 #ifdef DEBUG_META_MODE 1416 if (DEBUG(META)) 1417 fprintf(debug_file, "%s: %d: found: %s\n", fname, lineno, p); 1418 #endif 1419 if (!S_ISDIR(fs.st_mode) && 1420 fs.st_mtime > gn->mtime) { 1421 if (DEBUG(META)) 1422 fprintf(debug_file, "%s: %d: file '%s' is newer than the target...\n", fname, lineno, p); 1423 oodate = TRUE; 1424 } else if (S_ISDIR(fs.st_mode)) { 1425 /* Update the latest directory. */ 1426 cached_realpath(p, latestdir); 1427 } 1428 } else if (errno == ENOENT && *p == '/' && 1429 strncmp(p, cwd, cwdlen) != 0) { 1430 /* 1431 * A referenced file outside of CWD is missing. 1432 * We cannot catch every eventuality here... 1433 */ 1434 if (Lst_Find(missingFiles, p, string_match) == NULL) 1435 Lst_AtEnd(missingFiles, bmake_strdup(p)); 1436 } 1437 } 1438 if (buf[0] == 'E') { 1439 /* previous latestdir is no longer relevant */ 1440 strlcpy(latestdir, lcwd, sizeof(latestdir)); 1441 } 1442 break; 1443 default: 1444 break; 1445 } 1446 if (!oodate && buf[0] == 'L' && link_src != NULL) 1447 goto check_link_src; 1448 } else if (strcmp(buf, "CMD") == 0) { 1449 /* 1450 * Compare the current command with the one in the 1451 * meta data file. 1452 */ 1453 if (ln == NULL) { 1454 if (DEBUG(META)) 1455 fprintf(debug_file, "%s: %d: there were more build commands in the meta data file than there are now...\n", fname, lineno); 1456 oodate = TRUE; 1457 } else { 1458 char *cmd = (char *)Lst_Datum(ln); 1459 Boolean hasOODATE = FALSE; 1460 1461 if (strstr(cmd, "$?")) 1462 hasOODATE = TRUE; 1463 else if ((cp = strstr(cmd, ".OODATE"))) { 1464 /* check for $[{(].OODATE[:)}] */ 1465 if (cp > cmd + 2 && cp[-2] == '$') 1466 hasOODATE = TRUE; 1467 } 1468 if (hasOODATE) { 1469 needOODATE = TRUE; 1470 if (DEBUG(META)) 1471 fprintf(debug_file, "%s: %d: cannot compare command using .OODATE\n", fname, lineno); 1472 } 1473 cmd = Var_Subst(NULL, cmd, gn, VARF_WANTRES|VARF_UNDEFERR); 1474 1475 if ((cp = strchr(cmd, '\n'))) { 1476 int n; 1477 1478 /* 1479 * This command contains newlines, we need to 1480 * fetch more from the .meta file before we 1481 * attempt a comparison. 1482 */ 1483 /* first put the newline back at buf[x - 1] */ 1484 buf[x - 1] = '\n'; 1485 do { 1486 /* now fetch the next line */ 1487 if ((n = fgetLine(&buf, &bufsz, x, fp)) <= 0) 1488 break; 1489 x = n; 1490 lineno++; 1491 if (buf[x - 1] != '\n') { 1492 warnx("%s: %d: line truncated at %u", fname, lineno, x); 1493 break; 1494 } 1495 cp = strchr(++cp, '\n'); 1496 } while (cp); 1497 if (buf[x - 1] == '\n') 1498 buf[x - 1] = '\0'; 1499 } 1500 if (!hasOODATE && 1501 !(gn->type & OP_NOMETA_CMP) && 1502 strcmp(p, cmd) != 0) { 1503 if (DEBUG(META)) 1504 fprintf(debug_file, "%s: %d: a build command has changed\n%s\nvs\n%s\n", fname, lineno, p, cmd); 1505 if (!metaIgnoreCMDs) 1506 oodate = TRUE; 1507 } 1508 free(cmd); 1509 ln = Lst_Succ(ln); 1510 } 1511 } else if (strcmp(buf, "CWD") == 0) { 1512 /* 1513 * Check if there are extra commands now 1514 * that weren't in the meta data file. 1515 */ 1516 if (!oodate && ln != NULL) { 1517 if (DEBUG(META)) 1518 fprintf(debug_file, "%s: %d: there are extra build commands now that weren't in the meta data file\n", fname, lineno); 1519 oodate = TRUE; 1520 } 1521 if (strcmp(p, cwd) != 0) { 1522 if (DEBUG(META)) 1523 fprintf(debug_file, "%s: %d: the current working directory has changed from '%s' to '%s'\n", fname, lineno, p, curdir); 1524 oodate = TRUE; 1525 } 1526 } 1527 } 1528 1529 fclose(fp); 1530 if (!Lst_IsEmpty(missingFiles)) { 1531 if (DEBUG(META)) 1532 fprintf(debug_file, "%s: missing files: %s...\n", 1533 fname, (char *)Lst_Datum(Lst_First(missingFiles))); 1534 oodate = TRUE; 1535 } 1536 if (!oodate && !have_filemon && filemonMissing) { 1537 if (DEBUG(META)) 1538 fprintf(debug_file, "%s: missing filemon data\n", fname); 1539 oodate = TRUE; 1540 } 1541 } else { 1542 if (writeMeta && metaMissing) { 1543 cp = NULL; 1544 1545 /* if target is in .CURDIR we do not need a meta file */ 1546 if (gn->path && (cp = strrchr(gn->path, '/')) && cp > gn->path) { 1547 if (strncmp(curdir, gn->path, (cp - gn->path)) != 0) { 1548 cp = NULL; /* not in .CURDIR */ 1549 } 1550 } 1551 if (!cp) { 1552 if (DEBUG(META)) 1553 fprintf(debug_file, "%s: required but missing\n", fname); 1554 oodate = TRUE; 1555 needOODATE = TRUE; /* assume the worst */ 1556 } 1557 } 1558 } 1559 1560 Lst_Destroy(missingFiles, (FreeProc *)free); 1561 1562 if (oodate && needOODATE) { 1563 /* 1564 * Target uses .OODATE which is empty; or we wouldn't be here. 1565 * We have decided it is oodate, so .OODATE needs to be set. 1566 * All we can sanely do is set it to .ALLSRC. 1567 */ 1568 Var_Delete(OODATE, gn); 1569 Var_Set(OODATE, Var_Value(ALLSRC, gn, &cp), gn, 0); 1570 free(cp); 1571 } 1572 1573 oodate_out: 1574 for (i--; i >= 0; i--) { 1575 free(pa[i]); 1576 } 1577 return oodate; 1578 } 1579 1580 /* support for compat mode */ 1581 1582 static int childPipe[2]; 1583 1584 void 1585 meta_compat_start(void) 1586 { 1587 #ifdef USE_FILEMON_ONCE 1588 /* 1589 * We need to re-open filemon for each cmd. 1590 */ 1591 BuildMon *pbm = &Mybm; 1592 1593 if (pbm->mfp != NULL && useFilemon) { 1594 filemon_open(pbm); 1595 } else { 1596 pbm->mon_fd = pbm->filemon_fd = -1; 1597 } 1598 #endif 1599 if (pipe(childPipe) < 0) 1600 Punt("Cannot create pipe: %s", strerror(errno)); 1601 /* Set close-on-exec flag for both */ 1602 (void)fcntl(childPipe[0], F_SETFD, FD_CLOEXEC); 1603 (void)fcntl(childPipe[1], F_SETFD, FD_CLOEXEC); 1604 } 1605 1606 void 1607 meta_compat_child(void) 1608 { 1609 meta_job_child(NULL); 1610 if (dup2(childPipe[1], 1) < 0 || 1611 dup2(1, 2) < 0) { 1612 execError("dup2", "pipe"); 1613 _exit(1); 1614 } 1615 } 1616 1617 void 1618 meta_compat_parent(void) 1619 { 1620 FILE *fp; 1621 char buf[BUFSIZ]; 1622 1623 close(childPipe[1]); /* child side */ 1624 fp = fdopen(childPipe[0], "r"); 1625 while (fgets(buf, sizeof(buf), fp)) { 1626 meta_job_output(NULL, buf, ""); 1627 printf("%s", buf); 1628 fflush(stdout); 1629 } 1630 fclose(fp); 1631 } 1632 1633 #endif /* USE_META */ 1634