1 /* $NetBSD: meta.c,v 1.221 2026/04/06 17:13:54 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 #include <libgen.h> 40 #include <errno.h> 41 #if !defined(HAVE_CONFIG_H) || defined(HAVE_ERR_H) 42 #include <err.h> 43 #endif 44 45 #include "make.h" 46 #include "dir.h" 47 #include "job.h" 48 #include "meta.h" 49 50 #ifdef USE_FILEMON 51 #include "filemon/filemon.h" 52 #endif 53 54 static BuildMon Mybm; /* for compat */ 55 static StringList metaBailiwick = LST_INIT; /* our scope of control */ 56 static char *metaBailiwickStr; /* string storage for the list */ 57 static StringList metaIgnorePaths = LST_INIT; /* paths we deliberately ignore */ 58 static char *metaIgnorePathsStr; /* string storage for the list */ 59 60 #ifndef MAKE_META_IGNORE_PATHS 61 #define MAKE_META_IGNORE_PATHS ".MAKE.META.IGNORE_PATHS" 62 #endif 63 #ifndef MAKE_META_IGNORE_PATTERNS 64 #define MAKE_META_IGNORE_PATTERNS ".MAKE.META.IGNORE_PATTERNS" 65 #endif 66 #ifndef MAKE_META_IGNORE_FILTER 67 #define MAKE_META_IGNORE_FILTER ".MAKE.META.IGNORE_FILTER" 68 #endif 69 #ifndef MAKE_META_CMP_FILTER 70 #define MAKE_META_CMP_FILTER ".MAKE.META.CMP_FILTER" 71 #endif 72 73 bool useMeta = false; 74 static bool useFilemon = false; 75 static bool writeMeta = false; 76 static bool metaMissing = false; /* oodate if missing */ 77 static bool filemonMissing = false; /* oodate if missing */ 78 static bool metaEnv = false; /* don't save env unless asked */ 79 static bool metaVerbose = false; 80 static bool metaIgnoreCMDs = false; /* ignore CMDs in .meta files */ 81 static bool metaIgnorePatterns = false; /* do we need to do pattern matches */ 82 static bool metaIgnoreFilter = false; /* do we have more complex filtering? */ 83 static bool metaCmpFilter = false; /* do we have CMP_FILTER ? */ 84 static bool metaCurdirOk = false; /* write .meta in .CURDIR Ok? */ 85 static bool metaSilent = false; /* if we have a .meta be SILENT */ 86 87 88 #define MAKE_META_PREFIX ".MAKE.META.PREFIX" 89 90 #ifndef N2U 91 # define N2U(n, u) (((n) + ((u) - 1)) / (u)) 92 #endif 93 #ifndef ROUNDUP 94 # define ROUNDUP(n, u) (N2U((n), (u)) * (u)) 95 #endif 96 97 #if !defined(HAVE_STRSEP) 98 # define strsep(s, d) stresep((s), (d), '\0') 99 #endif 100 101 /* 102 * Filemon is a kernel module which snoops certain syscalls. 103 * 104 * C chdir 105 * E exec 106 * F [v]fork 107 * L [sym]link 108 * M rename 109 * R read 110 * W write 111 * S stat 112 * 113 * See meta_oodate below - we mainly care about 'E' and 'R'. 114 * 115 * We can still use meta mode without filemon, but 116 * the benefits are more limited. 117 */ 118 #ifdef USE_FILEMON 119 120 /* 121 * Open the filemon device. 122 */ 123 static void 124 meta_open_filemon(BuildMon *pbm) 125 { 126 int dupfd; 127 128 pbm->mon_fd = -1; 129 pbm->filemon = NULL; 130 if (!useFilemon || pbm->mfp == NULL) 131 return; 132 133 pbm->filemon = filemon_open(); 134 if (pbm->filemon == NULL) { 135 useFilemon = false; 136 warn("Could not open filemon %s", filemon_path()); 137 return; 138 } 139 140 /* 141 * We use a file outside of '.' 142 * to avoid a FreeBSD kernel bug where unlink invalidates 143 * cwd causing getcwd to do a lot more work. 144 * We only care about the descriptor. 145 */ 146 if (!opts.compatMake) 147 pbm->mon_fd = Job_TempFile("filemon.XXXXXX", NULL, 0); 148 else 149 pbm->mon_fd = mkTempFile("filemon.XXXXXX", NULL, 0); 150 if ((dupfd = dup(pbm->mon_fd)) == -1) { 151 Punt("Could not dup filemon output: %s", strerror(errno)); 152 } 153 (void)fcntl(dupfd, F_SETFD, FD_CLOEXEC); 154 if (filemon_setfd(pbm->filemon, dupfd) == -1) { 155 Punt("Could not set filemon file descriptor: %s", strerror(errno)); 156 } 157 /* we don't need these once we exec */ 158 (void)fcntl(pbm->mon_fd, F_SETFD, FD_CLOEXEC); 159 } 160 161 /* 162 * Read the build monitor output file and write records to the target's 163 * metadata file. 164 */ 165 static int 166 filemon_read(FILE *mfp, int fd) 167 { 168 char buf[BUFSIZ]; 169 int error; 170 171 /* Check if we're not writing to a meta data file.*/ 172 if (mfp == NULL) { 173 if (fd >= 0) 174 close(fd); /* not interested */ 175 return 0; 176 } 177 /* rewind */ 178 if (lseek(fd, (off_t)0, SEEK_SET) < 0) { 179 error = errno; 180 warn("Could not rewind filemon"); 181 fprintf(mfp, "\n"); 182 } else { 183 ssize_t n; 184 185 error = 0; 186 fprintf(mfp, "\n-- filemon acquired metadata --\n"); 187 188 while ((n = read(fd, buf, sizeof buf)) > 0) { 189 if ((ssize_t)fwrite(buf, 1, (size_t)n, mfp) < n) 190 error = EIO; 191 } 192 } 193 if (fflush(mfp) != 0) 194 Punt("Cannot write filemon data to meta file: %s", 195 strerror(errno)); 196 if (close(fd) < 0) 197 error = errno; 198 return error; 199 } 200 #endif 201 202 /* 203 * when realpath() fails, 204 * we use this, to clean up ./ and ../ 205 */ 206 static void 207 eat_dots(char *buf) 208 { 209 char *p; 210 211 while ((p = strstr(buf, "/./")) != NULL) 212 memmove(p, p + 2, strlen(p + 2) + 1); 213 214 while ((p = strstr(buf, "/../")) != NULL) { 215 char *p2 = p + 3; 216 if (p > buf) { 217 do { 218 p--; 219 } while (p > buf && *p != '/'); 220 } 221 if (*p == '/') 222 memmove(p, p2, strlen(p2) + 1); 223 else 224 return; /* can't happen? */ 225 } 226 } 227 228 static char * 229 meta_name(char *mname, size_t mnamelen, 230 const char *dname, 231 const char *tname, 232 const char *cwd) 233 { 234 char buf[MAXPATHLEN]; 235 char *rp, *cp; 236 const char *tname_base; 237 char *tp; 238 char *dtp; 239 size_t ldname; 240 241 /* 242 * Weed out relative paths from the target file name. 243 * We have to be careful though since if target is a 244 * symlink, the result will be unstable. 245 * So we use realpath() just to get the dirname, and leave the 246 * basename as given to us. 247 */ 248 if ((tname_base = strrchr(tname, '/')) != NULL) { 249 if (cached_realpath(tname, buf) != NULL) { 250 if ((rp = strrchr(buf, '/')) != NULL) { 251 rp++; 252 tname_base++; 253 if (strcmp(tname_base, rp) != 0) 254 strlcpy(rp, tname_base, sizeof buf - (size_t)(rp - buf)); 255 } 256 tname = buf; 257 } else { 258 /* 259 * We likely have a directory which is about to be made. 260 * We pretend realpath() succeeded, to have a chance 261 * of generating the same meta file name that we will 262 * next time through. 263 */ 264 if (tname[0] == '/') { 265 strlcpy(buf, tname, sizeof buf); 266 } else { 267 snprintf(buf, sizeof buf, "%s/%s", cwd, tname); 268 } 269 eat_dots(buf); 270 tname = buf; 271 } 272 } 273 /* on some systems dirname may modify its arg */ 274 tp = bmake_strdup(tname); 275 dtp = dirname(tp); 276 if (strcmp(dname, dtp) == 0) { 277 if (snprintf(mname, mnamelen, "%s.meta", tname) >= (int)mnamelen) 278 mname[mnamelen - 1] = '\0'; 279 } else { 280 int x; 281 282 ldname = strlen(dname); 283 if (strncmp(dname, dtp, ldname) == 0 && dtp[ldname] == '/') 284 x = snprintf(mname, mnamelen, "%s/%s.meta", dname, &tname[ldname+1]); 285 else 286 x = snprintf(mname, mnamelen, "%s/%s.meta", dname, tname); 287 if (x >= (int)mnamelen) 288 mname[mnamelen - 1] = '\0'; 289 /* 290 * Replace path separators in the file name after the 291 * current object directory path. 292 */ 293 cp = mname + strlen(dname) + 1; 294 295 while (*cp != '\0') { 296 if (*cp == '/') 297 *cp = '_'; 298 cp++; 299 } 300 } 301 free(tp); 302 return mname; 303 } 304 305 static bool 306 any_is_submake(GNode *gn) 307 { 308 StringListNode *ln; 309 char *cmd; 310 311 for (ln = gn->commands.first; ln != NULL; ln = ln->next) { 312 cmd = Var_Subst(ln->datum, gn, VARE_EVAL); 313 if (MaybeSubMake(cmd)) { 314 free(cmd); 315 return true; 316 } 317 free(cmd); 318 } 319 return false; 320 } 321 322 static void 323 printCMD(const char *ucmd, FILE *fp, GNode *gn) 324 { 325 FStr xcmd = FStr_InitRefer(ucmd); 326 327 Var_Expand(&xcmd, gn, VARE_EVAL); 328 fprintf(fp, "CMD %s\n", xcmd.str); 329 FStr_Done(&xcmd); 330 } 331 332 static void 333 printCMDs(GNode *gn, FILE *fp) 334 { 335 StringListNode *ln; 336 337 for (ln = gn->commands.first; ln != NULL; ln = ln->next) 338 printCMD(ln->datum, fp, gn); 339 } 340 341 /* 342 * Certain node types never get a .meta file 343 */ 344 #define SKIP_META_TYPE(flag, str) do { \ 345 if ((gn->type & (flag))) { \ 346 if (verbose) \ 347 debug_printf("Skipping meta for %s: .%s\n", gn->name, str); \ 348 return false; \ 349 } \ 350 } while (false) 351 352 353 /* 354 * Do we need/want a .meta file ? 355 */ 356 static bool 357 meta_needed(GNode *gn, const char *dname, 358 char *objdir_realpath, bool verbose) 359 { 360 struct cached_stat cst; 361 362 if (verbose) 363 verbose = DEBUG(META); 364 365 /* This may be a phony node which we don't want meta data for... */ 366 /* Skip .meta for .BEGIN, .END, .ERROR etc as well. */ 367 /* Or it may be explicitly flagged as .NOMETA */ 368 SKIP_META_TYPE(OP_NOMETA, "NOMETA"); 369 /* Unless it is explicitly flagged as .META */ 370 if (!(gn->type & OP_META)) { 371 SKIP_META_TYPE(OP_PHONY, "PHONY"); 372 SKIP_META_TYPE(OP_SPECIAL, "SPECIAL"); 373 SKIP_META_TYPE(OP_MAKE, "MAKE"); 374 SKIP_META_TYPE(OP_SUBMAKE, "SUBMAKE"); 375 } 376 377 /* Check if there are no commands to execute. */ 378 if (Lst_IsEmpty(&gn->commands)) { 379 if (verbose) 380 debug_printf("Skipping meta for %s: no commands\n", gn->name); 381 return false; 382 } 383 384 /* 385 * If called from meta_oodate, gn->flags.doneSubmake will be false. 386 * While OP_SUBMAKE only matters in jobs mode, 387 * we normally skip .meta files for sub-makes, so we want to check 388 * even in compat mode. 389 */ 390 if (gn->flags.doneSubmake == false 391 && (gn->type & (OP_MAKE | OP_META)) == 0) { 392 gn->flags.doneSubmake = true; 393 if (any_is_submake(gn)) { 394 gn->type |= OP_SUBMAKE; 395 SKIP_META_TYPE(OP_SUBMAKE, "SUBMAKE"); 396 } 397 } 398 399 /* The object directory may not exist. Check it.. */ 400 if (cached_stat(dname, &cst) != 0) { 401 if (verbose) 402 debug_printf("Skipping meta for %s: no .OBJDIR\n", gn->name); 403 return false; 404 } 405 406 /* make sure these are canonical */ 407 if (cached_realpath(dname, objdir_realpath) != NULL) 408 dname = objdir_realpath; 409 410 /* If we aren't in the object directory, don't create a meta file. */ 411 if (!metaCurdirOk && strcmp(curdir, dname) == 0) { 412 if (verbose) 413 debug_printf("Skipping meta for %s: .OBJDIR == .CURDIR\n", 414 gn->name); 415 return false; 416 } 417 return true; 418 } 419 420 421 static FILE * 422 meta_create(BuildMon *pbm, GNode *gn) 423 { 424 FILE *fp; 425 char buf[MAXPATHLEN]; 426 char objdir_realpath[MAXPATHLEN]; 427 char **ptr; 428 FStr dname; 429 const char *tname; 430 char *fname; 431 const char *cp; 432 433 fp = NULL; 434 435 dname = Var_Value(gn, ".OBJDIR"); 436 tname = GNode_VarTarget(gn); 437 438 /* if this succeeds objdir_realpath is realpath of dname */ 439 if (!meta_needed(gn, dname.str, objdir_realpath, true)) 440 goto out; 441 dname.str = objdir_realpath; 442 443 if (metaVerbose) { 444 /* Describe the target we are building */ 445 char *mp = Var_Subst("${" MAKE_META_PREFIX "}", gn, VARE_EVAL); 446 /* TODO: handle errors */ 447 if (mp[0] != '\0') 448 fprintf(stdout, "%s\n", mp); 449 free(mp); 450 } 451 452 fflush(stdout); 453 454 if (!writeMeta) 455 /* Don't create meta data. */ 456 goto out; 457 458 fname = meta_name(pbm->meta_fname, sizeof pbm->meta_fname, 459 dname.str, tname, objdir_realpath); 460 461 #ifdef DEBUG_META_MODE 462 DEBUG1(META, "meta_create: %s\n", fname); 463 #endif 464 465 if ((fp = fopen(fname, "w")) == NULL) 466 Punt("Could not open meta file '%s': %s", fname, strerror(errno)); 467 468 fprintf(fp, "# Meta data file %s\n", fname); 469 470 printCMDs(gn, fp); 471 472 fprintf(fp, "CWD %s\n", getcwd(buf, sizeof buf)); 473 fprintf(fp, "TARGET %s\n", tname); 474 cp = GNode_VarOodate(gn); 475 if (cp != NULL && *cp != '\0') { 476 fprintf(fp, "OODATE %s\n", cp); 477 } 478 if (metaEnv) { 479 for (ptr = environ; *ptr != NULL; ptr++) 480 fprintf(fp, "ENV %s\n", *ptr); 481 } 482 483 fprintf(fp, "-- command output --\n"); 484 if (fflush(fp) != 0) 485 Punt("Cannot write expanded command to meta file: %s", 486 strerror(errno)); 487 488 Global_Append(".MAKE.META.FILES", fname); 489 Global_Append(".MAKE.META.CREATED", fname); 490 491 gn->type |= OP_META; /* in case anyone wants to know */ 492 if (metaSilent) { 493 gn->type |= OP_SILENT; 494 } 495 out: 496 FStr_Done(&dname); 497 498 return fp; 499 } 500 501 static bool 502 boolValue(const char *s) 503 { 504 switch (*s) { 505 case '0': 506 case 'N': 507 case 'n': 508 case 'F': 509 case 'f': 510 return false; 511 } 512 return true; 513 } 514 515 /* 516 * Initialization we need before reading makefiles. 517 */ 518 void 519 meta_init(void) 520 { 521 #ifdef USE_FILEMON 522 /* this allows makefiles to test if we have filemon support */ 523 Global_Set(".MAKE.PATH_FILEMON", filemon_path()); 524 #endif 525 } 526 527 528 #define get_mode_bf(bf, token) \ 529 if ((cp = strstr(make_mode, token)) != NULL) \ 530 bf = boolValue(cp + sizeof (token) - 1) 531 532 /* 533 * Initialization we need after reading makefiles. 534 */ 535 void 536 meta_mode_init(const char *make_mode) 537 { 538 static bool once = false; 539 const char *cp; 540 541 useMeta = true; 542 useFilemon = true; 543 writeMeta = true; 544 545 if (make_mode != NULL) { 546 if (strstr(make_mode, "env") != NULL) 547 metaEnv = true; 548 if (strstr(make_mode, "verb") != NULL) 549 metaVerbose = true; 550 if (strstr(make_mode, "read") != NULL) 551 writeMeta = false; 552 if (strstr(make_mode, "nofilemon") != NULL) 553 useFilemon = false; 554 if (strstr(make_mode, "ignore-cmd") != NULL) 555 metaIgnoreCMDs = true; 556 if (useFilemon) 557 get_mode_bf(filemonMissing, "missing-filemon="); 558 get_mode_bf(metaCurdirOk, "curdirok="); 559 get_mode_bf(metaMissing, "missing-meta="); 560 get_mode_bf(metaSilent, "silent="); 561 } 562 if (metaVerbose && !Var_Exists(SCOPE_GLOBAL, MAKE_META_PREFIX)) { 563 /* 564 * The default value for MAKE_META_PREFIX 565 * prints the absolute path of the target. 566 * This works be cause :H will generate '.' if there is no / 567 * and :tA will resolve that to cwd. 568 */ 569 Global_Set(MAKE_META_PREFIX, 570 "Building ${.TARGET:H:tA}/${.TARGET:T}"); 571 } 572 if (once) 573 return; 574 once = true; 575 memset(&Mybm, 0, sizeof Mybm); 576 /* 577 * We consider ourselves master of all within ${.MAKE.META.BAILIWICK} 578 */ 579 metaBailiwickStr = Var_Subst("${.MAKE.META.BAILIWICK:O:u:tA}", 580 SCOPE_GLOBAL, VARE_EVAL); 581 /* TODO: handle errors */ 582 AppendWords(&metaBailiwick, metaBailiwickStr); 583 /* 584 * We ignore any paths that start with ${.MAKE.META.IGNORE_PATHS} 585 */ 586 Global_Append(MAKE_META_IGNORE_PATHS, 587 "/dev /etc /proc /tmp /var/run /var/tmp ${TMPDIR}"); 588 metaIgnorePathsStr = Var_Subst("${" MAKE_META_IGNORE_PATHS ":O:u:tA}", 589 SCOPE_GLOBAL, VARE_EVAL); 590 /* TODO: handle errors */ 591 AppendWords(&metaIgnorePaths, metaIgnorePathsStr); 592 593 /* 594 * We ignore any paths that match ${.MAKE.META.IGNORE_PATTERNS} 595 */ 596 metaIgnorePatterns = Var_Exists(SCOPE_GLOBAL, MAKE_META_IGNORE_PATTERNS); 597 metaIgnoreFilter = Var_Exists(SCOPE_GLOBAL, MAKE_META_IGNORE_FILTER); 598 metaCmpFilter = Var_Exists(SCOPE_GLOBAL, MAKE_META_CMP_FILTER); 599 } 600 601 MAKE_INLINE BuildMon * 602 BM(Job *job) 603 { 604 605 return job != NULL ? Job_BuildMon(job) : &Mybm; 606 } 607 608 /* 609 * In each case below we allow for job==NULL 610 */ 611 void 612 meta_job_start(Job *job, GNode *gn) 613 { 614 BuildMon *pbm; 615 616 pbm = BM(job); 617 pbm->mfp = meta_create(pbm, gn); 618 #ifdef USE_FILEMON_ONCE 619 /* compat mode we open the filemon dev once per command */ 620 if (job == NULL) 621 return; 622 #endif 623 #ifdef USE_FILEMON 624 if (pbm->mfp != NULL && useFilemon) { 625 meta_open_filemon(pbm); 626 } else { 627 pbm->mon_fd = -1; 628 pbm->filemon = NULL; 629 } 630 #endif 631 } 632 633 /* 634 * The child calls this before doing anything. 635 * It does not disturb our state. 636 */ 637 void 638 meta_job_child(Job *job MAKE_ATTR_UNUSED) 639 { 640 #ifdef USE_FILEMON 641 BuildMon *pbm; 642 643 pbm = BM(job); 644 if (pbm->mfp != NULL) { 645 close(fileno(pbm->mfp)); 646 if (useFilemon && pbm->filemon != NULL) { 647 pid_t pid; 648 649 pid = getpid(); 650 if (filemon_setpid_child(pbm->filemon, pid) == -1) { 651 Punt("Could not set filemon pid: %s", strerror(errno)); 652 } 653 } 654 } 655 #endif 656 } 657 658 void 659 meta_job_parent(Job *job MAKE_ATTR_UNUSED, pid_t pid MAKE_ATTR_UNUSED) 660 { 661 #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV) 662 BuildMon *pbm; 663 664 pbm = BM(job); 665 if (useFilemon && pbm->filemon != NULL) { 666 filemon_setpid_parent(pbm->filemon, pid); 667 } 668 #endif 669 } 670 671 int 672 meta_job_fd(Job *job MAKE_ATTR_UNUSED) 673 { 674 #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV) 675 BuildMon *pbm; 676 677 pbm = BM(job); 678 if (useFilemon && pbm->filemon != NULL) { 679 return filemon_readfd(pbm->filemon); 680 } 681 #endif 682 return -1; 683 } 684 685 int 686 meta_job_event(Job *job MAKE_ATTR_UNUSED) 687 { 688 #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV) 689 BuildMon *pbm; 690 691 pbm = BM(job); 692 if (useFilemon && pbm->filemon != NULL) { 693 return filemon_process(pbm->filemon); 694 } 695 #endif 696 return 0; 697 } 698 699 void 700 meta_job_error(Job *job, GNode *gn, bool ignerr, int status) 701 { 702 char cwd[MAXPATHLEN]; 703 BuildMon *pbm; 704 705 pbm = BM(job); 706 if (job != NULL && gn == NULL) 707 gn = Job_Node(job); 708 if (pbm->mfp != NULL) { 709 fprintf(pbm->mfp, "\n*** Error code %d%s\n", 710 status, ignerr ? "(ignored)" : ""); 711 } 712 if (gn != NULL) 713 Global_Set(".ERROR_TARGET", GNode_Path(gn)); 714 if (getcwd(cwd, sizeof cwd) == NULL) 715 Punt("getcwd: %s", strerror(errno)); 716 717 Global_Set(".ERROR_CWD", cwd); 718 if (pbm->meta_fname[0] != '\0') { 719 Global_Set(".ERROR_META_FILE", pbm->meta_fname); 720 } 721 meta_job_finish(job); 722 } 723 724 void 725 meta_job_output(Job *job, const char *cp, size_t len) 726 { 727 BuildMon *pbm; 728 729 pbm = BM(job); 730 if (pbm->mfp != NULL) { 731 if (metaVerbose) { 732 static char *meta_prefix = NULL; 733 static size_t meta_prefix_len; 734 735 if (meta_prefix == NULL) { 736 meta_prefix = Var_Subst("${" MAKE_META_PREFIX "}", 737 SCOPE_GLOBAL, VARE_EVAL); 738 /* TODO: handle errors */ 739 meta_prefix_len = strcspn(meta_prefix, "$"); 740 } 741 if (strncmp(cp, meta_prefix, meta_prefix_len) == 0) { 742 cp = strchr(cp + 1, '\n'); 743 if (cp == NULL) 744 return; 745 cp++; 746 } 747 } 748 fprintf(pbm->mfp, "%.*s", (int)len, cp); 749 } 750 } 751 752 int 753 meta_cmd_finish(void *pbmp) 754 { 755 int error = 0; 756 BuildMon *pbm = pbmp; 757 #ifdef USE_FILEMON 758 int x; 759 #endif 760 761 if (pbm == NULL) 762 pbm = &Mybm; 763 764 #ifdef USE_FILEMON 765 if (pbm->filemon != NULL) { 766 while (filemon_process(pbm->filemon) > 0) 767 continue; 768 if (filemon_close(pbm->filemon) == -1) { 769 error = errno; 770 Punt("filemon failed: %s", strerror(errno)); 771 } 772 x = filemon_read(pbm->mfp, pbm->mon_fd); 773 if (error == 0 && x != 0) 774 error = x; 775 pbm->mon_fd = -1; 776 pbm->filemon = NULL; 777 return error; 778 } 779 #endif 780 781 fprintf(pbm->mfp, "\n"); /* ensure end with newline */ 782 return error; 783 } 784 785 int 786 meta_job_finish(Job *job) 787 { 788 BuildMon *pbm; 789 int error = 0; 790 int x; 791 792 pbm = BM(job); 793 if (pbm->mfp != NULL) { 794 error = meta_cmd_finish(pbm); 795 x = fclose(pbm->mfp); 796 if (error == 0 && x != 0) 797 error = errno; 798 pbm->mfp = NULL; 799 pbm->meta_fname[0] = '\0'; 800 } 801 return error; 802 } 803 804 void 805 meta_finish(void) 806 { 807 Lst_Done(&metaBailiwick); 808 free(metaBailiwickStr); 809 Lst_Done(&metaIgnorePaths); 810 free(metaIgnorePathsStr); 811 } 812 813 /* 814 * Fetch a full line from fp - growing bufp if needed 815 * Return length in bufp. 816 */ 817 static int 818 fgetLine(char **bufp, size_t *szp, int o, FILE *fp) 819 { 820 char *buf = *bufp; 821 size_t bufsz = *szp; 822 struct stat fs; 823 int x; 824 825 if (fgets(&buf[o], (int)bufsz - o, fp) != NULL) { 826 check_newline: 827 x = o + (int)strlen(&buf[o]); 828 if (buf[x - 1] == '\n') 829 return x; 830 /* 831 * We need to grow the buffer. 832 * The meta file can give us a clue. 833 */ 834 if (fstat(fileno(fp), &fs) == 0) { 835 size_t newsz; 836 char *p; 837 838 newsz = ROUNDUP(((size_t)fs.st_size / 2), BUFSIZ); 839 if (newsz <= bufsz) 840 newsz = ROUNDUP((size_t)fs.st_size, BUFSIZ); 841 if (newsz <= bufsz) 842 return x; /* truncated */ 843 DEBUG2(META, "growing buffer %u -> %u\n", 844 (unsigned)bufsz, (unsigned)newsz); 845 p = bmake_realloc(buf, newsz); 846 *bufp = buf = p; 847 *szp = bufsz = newsz; 848 /* fetch the rest */ 849 if (fgets(&buf[x], (int)bufsz - x, fp) == NULL) 850 return x; /* truncated! */ 851 goto check_newline; 852 } 853 } 854 return 0; 855 } 856 857 static bool 858 prefix_match(const char *prefix, const char *path) 859 { 860 size_t n = strlen(prefix); 861 862 return strncmp(path, prefix, n) == 0; 863 } 864 865 static bool 866 has_any_prefix(const char *path, StringList *prefixes) 867 { 868 StringListNode *ln; 869 870 for (ln = prefixes->first; ln != NULL; ln = ln->next) 871 if (prefix_match(ln->datum, path)) 872 return true; 873 return false; 874 } 875 876 /* See if the path equals prefix or starts with "prefix/". */ 877 static bool 878 path_starts_with(const char *path, const char *prefix) 879 { 880 size_t n = strlen(prefix); 881 882 if (strncmp(path, prefix, n) != 0) 883 return false; 884 return path[n] == '\0' || path[n] == '/'; 885 } 886 887 static bool 888 meta_ignore(GNode *gn, const char *p) 889 { 890 char fname[MAXPATHLEN]; 891 892 if (p == NULL) 893 return true; 894 895 if (*p == '/') { 896 /* first try the raw path "as is" */ 897 if (has_any_prefix(p, &metaIgnorePaths)) { 898 #ifdef DEBUG_META_MODE 899 DEBUG1(META, "meta_oodate: ignoring path: %s\n", p); 900 #endif 901 return true; 902 } 903 cached_realpath(p, fname); /* clean it up */ 904 if (has_any_prefix(fname, &metaIgnorePaths)) { 905 #ifdef DEBUG_META_MODE 906 DEBUG1(META, "meta_oodate: ignoring path: %s\n", p); 907 #endif 908 return true; 909 } 910 } 911 912 if (metaIgnorePatterns) { 913 const char *expr; 914 char *pm; 915 916 /* 917 * XXX: This variable is set on a target GNode but is not one of 918 * the usual local variables. It should be deleted afterwards. 919 * Ideally it would not be created in the first place, just like 920 * in a .for loop. 921 */ 922 Var_Set(gn, ".p.", p); 923 expr = "${" MAKE_META_IGNORE_PATTERNS ":@m@${.p.:M$m}@}"; 924 pm = Var_Subst(expr, gn, VARE_EVAL); 925 /* TODO: handle errors */ 926 if (pm[0] != '\0') { 927 #ifdef DEBUG_META_MODE 928 DEBUG1(META, "meta_oodate: ignoring pattern: %s\n", p); 929 #endif 930 free(pm); 931 return true; 932 } 933 free(pm); 934 } 935 936 if (metaIgnoreFilter) { 937 char *fm; 938 939 /* skip if filter result is empty */ 940 snprintf(fname, sizeof fname, 941 "${%s:L:${%s:ts:}}", 942 p, MAKE_META_IGNORE_FILTER); 943 fm = Var_Subst(fname, gn, VARE_EVAL); 944 /* TODO: handle errors */ 945 if (*fm == '\0') { 946 #ifdef DEBUG_META_MODE 947 DEBUG1(META, "meta_oodate: ignoring filtered: %s\n", p); 948 #endif 949 free(fm); 950 return true; 951 } 952 free(fm); 953 } 954 return false; 955 } 956 957 /* 958 * When running with 'meta' functionality, a target can be out-of-date 959 * if any of the references in its meta data file is more recent. 960 * We have to track the latestdir on a per-process basis. 961 */ 962 #define LCWD_VNAME_FMT ".meta.%d.lcwd" 963 #define LDIR_VNAME_FMT ".meta.%d.ldir" 964 965 /* 966 * It is possible that a .meta file is corrupted, 967 * if we detect this we want to reproduce it. 968 * Setting oodate true will have that effect. 969 */ 970 #define CHECK_VALID_META(p) if (!(p != NULL && *p != '\0')) { \ 971 warnx("%s:%u: malformed", fname, lineno); \ 972 oodate = true; \ 973 continue; \ 974 } 975 976 #define DEQUOTE(p) if (*p == '\'') { \ 977 char *ep; \ 978 p++; \ 979 if ((ep = strchr(p, '\'')) != NULL) \ 980 *ep = '\0'; \ 981 } 982 983 static void 984 append_if_new(StringList *list, const char *str) 985 { 986 StringListNode *ln; 987 988 for (ln = list->first; ln != NULL; ln = ln->next) 989 if (strcmp(ln->datum, str) == 0) 990 return; 991 Lst_Append(list, bmake_strdup(str)); 992 } 993 994 /* A "reserved" variable to store the command to be filtered */ 995 #define META_CMD_FILTER_VAR ".MAKE.cmd_filtered" 996 997 static char * 998 meta_filter_cmd(GNode *gn, char *s) 999 { 1000 Var_Set(gn, META_CMD_FILTER_VAR, s); 1001 s = Var_Subst( 1002 "${" META_CMD_FILTER_VAR ":${" MAKE_META_CMP_FILTER ":ts:}}", 1003 gn, VARE_EVAL); 1004 return s; 1005 } 1006 1007 static int 1008 meta_cmd_cmp(GNode *gn, char *a, char *b, bool filter) 1009 { 1010 int rc; 1011 1012 rc = strcmp(a, b); 1013 if (rc == 0 || !filter) 1014 return rc; 1015 a = meta_filter_cmd(gn, a); 1016 b = meta_filter_cmd(gn, b); 1017 rc = strcmp(a, b); 1018 free(a); 1019 free(b); 1020 Var_Delete(gn, META_CMD_FILTER_VAR); 1021 return rc; 1022 } 1023 1024 bool 1025 meta_oodate(GNode *gn, bool oodate) 1026 { 1027 static char *tmpdir = NULL; 1028 static char cwd[MAXPATHLEN]; 1029 char lcwd_vname[64]; 1030 char ldir_vname[64]; 1031 char lcwd[MAXPATHLEN]; 1032 char latestdir[MAXPATHLEN]; 1033 char fname[MAXPATHLEN]; 1034 char fname1[MAXPATHLEN]; 1035 char fname2[MAXPATHLEN]; 1036 char fname3[MAXPATHLEN]; 1037 FStr dname; 1038 const char *tname; 1039 char *p; 1040 char *link_src; 1041 char *move_target; 1042 static size_t cwdlen = 0; 1043 static size_t tmplen = 0; 1044 FILE *fp; 1045 bool needOODATE = false; 1046 StringList missingFiles; 1047 bool have_filemon = false; 1048 bool cmp_filter; 1049 1050 if (oodate) 1051 return oodate; /* we're done */ 1052 1053 dname = Var_Value(gn, ".OBJDIR"); 1054 tname = GNode_VarTarget(gn); 1055 1056 /* if this succeeds fname3 is realpath of dname */ 1057 if (!meta_needed(gn, dname.str, fname3, false)) 1058 goto oodate_out; 1059 dname.str = fname3; 1060 1061 Lst_Init(&missingFiles); 1062 1063 /* 1064 * We need to check if the target is out-of-date. This includes 1065 * checking if the expanded command has changed. This in turn 1066 * requires that all variables are set in the same way that they 1067 * would be if the target needs to be re-built. 1068 */ 1069 GNode_SetLocalVars(gn); 1070 1071 meta_name(fname, sizeof fname, dname.str, tname, dname.str); 1072 1073 #ifdef DEBUG_META_MODE 1074 DEBUG1(META, "meta_oodate: %s\n", fname); 1075 #endif 1076 1077 if ((fp = fopen(fname, "r")) != NULL) { 1078 static char *buf = NULL; 1079 static size_t bufsz; 1080 unsigned lineno = 0; 1081 int lastpid = 0; 1082 int pid; 1083 int x; 1084 StringListNode *cmdNode; 1085 struct cached_stat cst; 1086 1087 if (buf == NULL) { 1088 bufsz = 8 * BUFSIZ; 1089 buf = bmake_malloc(bufsz); 1090 } 1091 1092 if (cwdlen == 0) { 1093 if (getcwd(cwd, sizeof cwd) == NULL) 1094 err(1, "Could not get current working directory"); 1095 cwdlen = strlen(cwd); 1096 } 1097 strlcpy(lcwd, cwd, sizeof lcwd); 1098 strlcpy(latestdir, cwd, sizeof latestdir); 1099 1100 if (tmpdir == NULL) { 1101 tmpdir = getTmpdir(); 1102 tmplen = strlen(tmpdir); 1103 } 1104 1105 /* we want to track all the .meta we read */ 1106 Global_Append(".MAKE.META.FILES", fname); 1107 1108 cmp_filter = metaCmpFilter || Var_Exists(gn, MAKE_META_CMP_FILTER); 1109 1110 cmdNode = gn->commands.first; 1111 while (!oodate && (x = fgetLine(&buf, &bufsz, 0, fp)) > 0) { 1112 lineno++; 1113 if (buf[x - 1] == '\n') 1114 buf[x - 1] = '\0'; 1115 else { 1116 warnx("%s:%u: line truncated at %u", fname, lineno, x); 1117 oodate = true; 1118 break; 1119 } 1120 link_src = NULL; 1121 move_target = NULL; 1122 /* Find the start of the build monitor section. */ 1123 if (!have_filemon) { 1124 if (strncmp(buf, "-- filemon", 10) == 0) { 1125 have_filemon = true; 1126 continue; 1127 } 1128 if (strncmp(buf, "# buildmon", 10) == 0) { 1129 have_filemon = true; 1130 continue; 1131 } 1132 } 1133 1134 /* Delimit the record type. */ 1135 p = buf; 1136 #ifdef DEBUG_META_MODE 1137 DEBUG3(META, "%s:%u: %s\n", fname, lineno, buf); 1138 #endif 1139 strsep(&p, " "); 1140 if (have_filemon) { 1141 /* 1142 * We are in the 'filemon' output section. 1143 * Each record from filemon follows the general form: 1144 * 1145 * <key> <pid> <data> 1146 * 1147 * Where: 1148 * <key> is a single letter, denoting the syscall. 1149 * <pid> is the process that made the syscall. 1150 * <data> is the arguments (of interest). 1151 */ 1152 switch(buf[0]) { 1153 case '#': /* comment */ 1154 case 'V': /* version */ 1155 break; 1156 default: 1157 /* 1158 * We need to track pathnames per-process. 1159 * 1160 * Each process run by make starts off in the 'CWD' 1161 * recorded in the .meta file, if it chdirs ('C') 1162 * elsewhere we need to track that - but only for 1163 * that process. If it forks ('F'), we initialize 1164 * the child to have the same cwd as its parent. 1165 * 1166 * We also need to track the 'latestdir' of 1167 * interest. This is usually the same as cwd, but 1168 * not if a process is reading directories. 1169 * 1170 * Each time we spot a different process ('pid') 1171 * we save the current value of 'latestdir' in a 1172 * variable qualified by 'lastpid', and 1173 * re-initialize 'latestdir' to any pre-saved 1174 * value for the current 'pid' and 'CWD' if none. 1175 */ 1176 CHECK_VALID_META(p); 1177 pid = atoi(p); 1178 if (pid > 0 && pid != lastpid) { 1179 FStr ldir; 1180 1181 if (lastpid > 0) { 1182 /* We need to remember these. */ 1183 Global_Set(lcwd_vname, lcwd); 1184 Global_Set(ldir_vname, latestdir); 1185 } 1186 snprintf(lcwd_vname, sizeof lcwd_vname, LCWD_VNAME_FMT, pid); 1187 snprintf(ldir_vname, sizeof ldir_vname, LDIR_VNAME_FMT, pid); 1188 lastpid = pid; 1189 ldir = Var_Value(SCOPE_GLOBAL, ldir_vname); 1190 if (ldir.str != NULL) { 1191 strlcpy(latestdir, ldir.str, sizeof latestdir); 1192 FStr_Done(&ldir); 1193 } 1194 ldir = Var_Value(SCOPE_GLOBAL, lcwd_vname); 1195 if (ldir.str != NULL) { 1196 strlcpy(lcwd, ldir.str, sizeof lcwd); 1197 FStr_Done(&ldir); 1198 } 1199 } 1200 /* Skip past the pid. */ 1201 if (strsep(&p, " ") == NULL) 1202 continue; 1203 #ifdef DEBUG_META_MODE 1204 if (DEBUG(META)) 1205 debug_printf("%s:%u: %d: %c: cwd=%s lcwd=%s ldir=%s\n", 1206 fname, lineno, 1207 pid, buf[0], cwd, lcwd, latestdir); 1208 #endif 1209 break; 1210 } 1211 1212 CHECK_VALID_META(p); 1213 1214 /* Process according to record type. */ 1215 switch (buf[0]) { 1216 case 'X': /* eXit */ 1217 Var_Delete(SCOPE_GLOBAL, lcwd_vname); 1218 Var_Delete(SCOPE_GLOBAL, ldir_vname); 1219 lastpid = 0; /* no need to save ldir_vname */ 1220 break; 1221 1222 case 'F': /* [v]Fork */ 1223 { 1224 char cldir[64]; 1225 int child; 1226 1227 child = atoi(p); 1228 if (child > 0) { 1229 snprintf(cldir, sizeof cldir, LCWD_VNAME_FMT, child); 1230 Global_Set(cldir, lcwd); 1231 snprintf(cldir, sizeof cldir, LDIR_VNAME_FMT, child); 1232 Global_Set(cldir, latestdir); 1233 #ifdef DEBUG_META_MODE 1234 if (DEBUG(META)) 1235 debug_printf( 1236 "%s:%u: %d: cwd=%s lcwd=%s ldir=%s\n", 1237 fname, lineno, 1238 child, cwd, lcwd, latestdir); 1239 #endif 1240 } 1241 } 1242 break; 1243 1244 case 'C': /* Chdir */ 1245 /* Update lcwd and latest directory. */ 1246 strlcpy(latestdir, p, sizeof latestdir); 1247 strlcpy(lcwd, p, sizeof lcwd); 1248 Global_Set(lcwd_vname, lcwd); 1249 Global_Set(ldir_vname, lcwd); 1250 #ifdef DEBUG_META_MODE 1251 DEBUG4(META, "%s:%u: cwd=%s ldir=%s\n", 1252 fname, lineno, cwd, lcwd); 1253 #endif 1254 break; 1255 1256 case 'M': /* renaMe */ 1257 /* 1258 * For 'M'oves we want to check 1259 * the src as for 'R'ead 1260 * and the target as for 'W'rite. 1261 */ 1262 { 1263 char *cp = p; /* save this for a second */ 1264 /* now get target */ 1265 if (strsep(&p, " ") == NULL) 1266 continue; 1267 CHECK_VALID_META(p); 1268 move_target = p; 1269 p = cp; 1270 } 1271 /* 'L' and 'M' put single quotes around the args */ 1272 DEQUOTE(p); 1273 DEQUOTE(move_target); 1274 /* FALLTHROUGH */ 1275 case 'D': /* unlink */ 1276 if (*p == '/') { 1277 /* remove any missingFiles entries that match p */ 1278 StringListNode *ln = missingFiles.first; 1279 while (ln != NULL) { 1280 StringListNode *next = ln->next; 1281 if (path_starts_with(ln->datum, p)) { 1282 free(ln->datum); 1283 Lst_Remove(&missingFiles, ln); 1284 } 1285 ln = next; 1286 } 1287 } 1288 if (buf[0] == 'M') { 1289 /* the target of the mv is a file 'W'ritten */ 1290 #ifdef DEBUG_META_MODE 1291 DEBUG2(META, "meta_oodate: M %s -> %s\n", 1292 p, move_target); 1293 #endif 1294 p = move_target; 1295 goto check_write; 1296 } 1297 break; 1298 case 'L': /* Link */ 1299 /* 1300 * For 'L'inks check 1301 * the src as for 'R'ead 1302 * and the target as for 'W'rite. 1303 */ 1304 link_src = p; 1305 /* now get target */ 1306 if (strsep(&p, " ") == NULL) 1307 continue; 1308 CHECK_VALID_META(p); 1309 /* 'L' and 'M' put single quotes around the args */ 1310 DEQUOTE(p); 1311 DEQUOTE(link_src); 1312 #ifdef DEBUG_META_MODE 1313 DEBUG2(META, "meta_oodate: L %s -> %s\n", 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 (!has_any_prefix(p, &metaBailiwick)) 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 /* XXX: The arguments to strstr must be swapped. */ 1343 if (strstr("tmp", p) != NULL) 1344 break; 1345 1346 if ((link_src != NULL && cached_lstat(p, &cst) < 0) || 1347 (link_src == NULL && cached_stat(p, &cst) < 0)) { 1348 if (!meta_ignore(gn, p)) 1349 append_if_new(&missingFiles, p); 1350 } 1351 break; 1352 check_link_src: 1353 p = link_src; 1354 link_src = NULL; 1355 #ifdef DEBUG_META_MODE 1356 DEBUG1(META, "meta_oodate: L src %s\n", p); 1357 #endif 1358 /* FALLTHROUGH */ 1359 case 'R': /* Read */ 1360 case 'E': /* Exec */ 1361 /* 1362 * Check for runtime files that can't 1363 * be part of the dependencies because 1364 * they are _expected_ to change. 1365 */ 1366 if (meta_ignore(gn, p)) 1367 break; 1368 1369 /* 1370 * The rest of the record is the file name. 1371 * Check if it's not an absolute path. 1372 */ 1373 { 1374 char *sdirs[4]; 1375 char **sdp; 1376 int sdx = 0; 1377 bool found = false; 1378 1379 if (*p == '/') { 1380 sdirs[sdx++] = p; /* done */ 1381 } else { 1382 if (strcmp(".", p) == 0) 1383 continue; /* no point */ 1384 1385 /* Check vs latestdir */ 1386 if (snprintf(fname1, sizeof fname1, "%s/%s", latestdir, p) < (int)(sizeof fname1)) 1387 sdirs[sdx++] = fname1; 1388 1389 if (strcmp(latestdir, lcwd) != 0) { 1390 /* Check vs lcwd */ 1391 if (snprintf(fname2, sizeof fname2, "%s/%s", lcwd, p) < (int)(sizeof fname2)) 1392 sdirs[sdx++] = fname2; 1393 } 1394 if (strcmp(lcwd, cwd) != 0) { 1395 /* Check vs cwd */ 1396 if (snprintf(fname3, sizeof fname3, "%s/%s", cwd, p) < (int)(sizeof fname3)) 1397 sdirs[sdx++] = fname3; 1398 } 1399 } 1400 sdirs[sdx++] = NULL; 1401 1402 for (sdp = sdirs; *sdp != NULL && !found; sdp++) { 1403 #ifdef DEBUG_META_MODE 1404 DEBUG3(META, "%s:%u: looking for: %s\n", 1405 fname, lineno, *sdp); 1406 #endif 1407 if (cached_stat(*sdp, &cst) == 0) { 1408 found = true; 1409 p = *sdp; 1410 } 1411 } 1412 if (found) { 1413 #ifdef DEBUG_META_MODE 1414 DEBUG3(META, "%s:%u: found: %s\n", 1415 fname, lineno, p); 1416 #endif 1417 if (!S_ISDIR(cst.cst_mode) && 1418 cst.cst_mtime > gn->mtime) { 1419 DEBUG3(META, "%s:%u: file '%s' is newer than the target...\n", 1420 fname, lineno, p); 1421 oodate = true; 1422 } else if (S_ISDIR(cst.cst_mode)) { 1423 /* Update the latest directory. */ 1424 cached_realpath(p, latestdir); 1425 } 1426 } else if (errno == ENOENT && *p == '/' && 1427 strncmp(p, cwd, cwdlen) != 0) { 1428 /* 1429 * A referenced file outside of CWD is missing. 1430 * We cannot catch every eventuality here... 1431 */ 1432 append_if_new(&missingFiles, p); 1433 } 1434 } 1435 if (buf[0] == 'E') { 1436 /* previous latestdir is no longer relevant */ 1437 strlcpy(latestdir, lcwd, sizeof latestdir); 1438 } 1439 break; 1440 default: 1441 break; 1442 } 1443 if (!oodate && buf[0] == 'L' && link_src != NULL) 1444 goto check_link_src; 1445 } else if (strcmp(buf, "CMD") == 0) { 1446 /* 1447 * Compare the current command with the one in the 1448 * meta data file. 1449 */ 1450 if (cmdNode == NULL) { 1451 DEBUG2(META, "%s:%u: there were more build commands in the meta data file than there are now...\n", 1452 fname, lineno); 1453 oodate = true; 1454 } else { 1455 const char *cp; 1456 char *cmd = cmdNode->datum; 1457 bool hasOODATE = false; 1458 1459 if (strstr(cmd, "$?") != NULL) 1460 hasOODATE = true; 1461 else if ((cp = strstr(cmd, ".OODATE")) != NULL) { 1462 /* check for $[{(].OODATE[:)}] */ 1463 if (cp > cmd + 2 && cp[-2] == '$') 1464 hasOODATE = true; 1465 } 1466 if (hasOODATE) { 1467 needOODATE = true; 1468 DEBUG2(META, "%s:%u: cannot compare command using .OODATE\n", 1469 fname, lineno); 1470 } 1471 cmd = Var_Subst(cmd, gn, VARE_EVAL_DEFINED); 1472 /* TODO: handle errors */ 1473 1474 if ((cp = strchr(cmd, '\n')) != NULL) { 1475 int n; 1476 1477 /* 1478 * This command contains newlines, we need to 1479 * fetch more from the .meta file before we 1480 * attempt a comparison. 1481 */ 1482 /* first put the newline back at buf[x - 1] */ 1483 buf[x - 1] = '\n'; 1484 do { 1485 /* now fetch the next line */ 1486 if ((n = fgetLine(&buf, &bufsz, x, fp)) <= 0) 1487 break; 1488 x = n; 1489 lineno++; 1490 if (buf[x - 1] != '\n') { 1491 warnx("%s:%u: line truncated at %u", fname, lineno, x); 1492 break; 1493 } 1494 cp = strchr(cp + 1, '\n'); 1495 } while (cp != NULL); 1496 if (buf[x - 1] == '\n') 1497 buf[x - 1] = '\0'; 1498 } 1499 if (p != NULL && 1500 !hasOODATE && 1501 !(gn->type & OP_NOMETA_CMP) && 1502 meta_cmd_cmp(gn, p, cmd, cmp_filter) != 0) { 1503 DEBUG4(META, "%s:%u: a build command has changed\n%s\nvs\n%s\n", 1504 fname, lineno, p, cmd); 1505 if (!metaIgnoreCMDs) 1506 oodate = true; 1507 } 1508 free(cmd); 1509 cmdNode = cmdNode->next; 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 && cmdNode != NULL) { 1517 DEBUG2(META, "%s:%u: there are extra build commands now that weren't in the meta data file\n", 1518 fname, lineno); 1519 oodate = true; 1520 } 1521 CHECK_VALID_META(p); 1522 if (strcmp(p, cwd) != 0) { 1523 DEBUG4(META, "%s:%u: the current working directory has changed from '%s' to '%s'\n", 1524 fname, lineno, p, curdir); 1525 oodate = true; 1526 } 1527 } 1528 } 1529 1530 fclose(fp); 1531 if (!Lst_IsEmpty(&missingFiles)) { 1532 DEBUG2(META, "%s: missing files: %s...\n", 1533 fname, (char *)missingFiles.first->datum); 1534 oodate = true; 1535 } 1536 if (!oodate && !have_filemon && filemonMissing) { 1537 DEBUG1(META, "%s: missing filemon data\n", fname); 1538 oodate = true; 1539 } 1540 } else { 1541 if (writeMeta && (metaMissing || (gn->type & OP_META))) { 1542 const char *cp = NULL; 1543 1544 /* if target is in .CURDIR we do not need a meta file */ 1545 if (gn->path != NULL && (cp = strrchr(gn->path, '/')) != NULL && 1546 cp > gn->path) { 1547 if (strncmp(curdir, gn->path, (size_t)(cp - gn->path)) != 0) { 1548 cp = NULL; /* not in .CURDIR */ 1549 } 1550 } 1551 if (cp == NULL) { 1552 DEBUG1(META, "%s: required but missing\n", fname); 1553 oodate = true; 1554 needOODATE = true; /* assume the worst */ 1555 } 1556 } 1557 } 1558 1559 Lst_DoneFree(&missingFiles); 1560 1561 if (oodate && needOODATE) { 1562 /* 1563 * Target uses .OODATE which is empty; or we wouldn't be here. 1564 * We have decided it is oodate, so .OODATE needs to be set. 1565 * All we can sanely do is set it to .ALLSRC. 1566 */ 1567 Var_Delete(gn, OODATE); 1568 Var_Set(gn, OODATE, GNode_VarAllsrc(gn)); 1569 } 1570 1571 oodate_out: 1572 FStr_Done(&dname); 1573 return oodate; 1574 } 1575 1576 /* support for compat mode */ 1577 1578 static int childPipe[2]; 1579 1580 void 1581 meta_compat_start(void) 1582 { 1583 #ifdef USE_FILEMON_ONCE 1584 /* 1585 * We need to re-open filemon for each cmd. 1586 */ 1587 BuildMon *pbm = &Mybm; 1588 1589 if (pbm->mfp != NULL && useFilemon) { 1590 meta_open_filemon(pbm); 1591 } else { 1592 pbm->mon_fd = -1; 1593 pbm->filemon = NULL; 1594 } 1595 #endif 1596 if (pipe(childPipe) < 0) 1597 Punt("pipe: %s", strerror(errno)); 1598 /* Set close-on-exec flag for both */ 1599 (void)fcntl(childPipe[0], F_SETFD, FD_CLOEXEC); 1600 (void)fcntl(childPipe[1], F_SETFD, FD_CLOEXEC); 1601 } 1602 1603 void 1604 meta_compat_child(void) 1605 { 1606 meta_job_child(NULL); 1607 if (dup2(childPipe[1], STDOUT_FILENO) < 0 1608 || dup2(STDOUT_FILENO, STDERR_FILENO) < 0) 1609 execDie("dup2", "pipe"); 1610 } 1611 1612 void 1613 meta_compat_parent(pid_t child) 1614 { 1615 int outfd, metafd, maxfd, nfds; 1616 char buf[BUFSIZ+1]; 1617 fd_set readfds; 1618 1619 meta_job_parent(NULL, child); 1620 close(childPipe[1]); /* child side */ 1621 outfd = childPipe[0]; 1622 #ifdef USE_FILEMON 1623 metafd = Mybm.filemon != NULL ? filemon_readfd(Mybm.filemon) : -1; 1624 #else 1625 metafd = -1; 1626 #endif 1627 maxfd = -1; 1628 if (outfd > maxfd) 1629 maxfd = outfd; 1630 if (metafd > maxfd) 1631 maxfd = metafd; 1632 1633 while (outfd != -1 || metafd != -1) { 1634 FD_ZERO(&readfds); 1635 if (outfd != -1) { 1636 FD_SET(outfd, &readfds); 1637 } 1638 if (metafd != -1) { 1639 FD_SET(metafd, &readfds); 1640 } 1641 nfds = select(maxfd + 1, &readfds, NULL, NULL, NULL); 1642 if (nfds == -1) { 1643 if (errno == EINTR) 1644 continue; 1645 err(1, "select"); 1646 } 1647 1648 if (outfd != -1 && FD_ISSET(outfd, &readfds) != 0) do { 1649 /* XXX this is not line-buffered */ 1650 ssize_t nread = read(outfd, buf, sizeof buf - 1); 1651 if (nread == -1) 1652 err(1, "read"); 1653 if (nread == 0) { 1654 close(outfd); 1655 outfd = -1; 1656 break; 1657 } 1658 fwrite(buf, 1, (size_t)nread, stdout); 1659 fflush(stdout); 1660 buf[nread] = '\0'; 1661 meta_job_output(NULL, buf, (size_t)nread); 1662 } while (false); 1663 if (metafd != -1 && FD_ISSET(metafd, &readfds) != 0) { 1664 if (meta_job_event(NULL) <= 0) 1665 metafd = -1; 1666 } 1667 } 1668 } 1669 1670 #endif /* USE_META */ 1671
Indexes created Sat Jun 13 00:24:39 UTC 2026