1 /* $NetBSD: meta.c,v 1.204 2023/02/28 06:04:28 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 <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 49 #ifdef USE_FILEMON 50 #include "filemon/filemon.h" 51 #endif 52 53 static BuildMon Mybm; /* for compat */ 54 static StringList metaBailiwick = LST_INIT; /* our scope of control */ 55 static char *metaBailiwickStr; /* string storage for the list */ 56 static StringList metaIgnorePaths = LST_INIT; /* paths we deliberately ignore */ 57 static char *metaIgnorePathsStr; /* string storage for the list */ 58 59 #ifndef MAKE_META_IGNORE_PATHS 60 #define MAKE_META_IGNORE_PATHS ".MAKE.META.IGNORE_PATHS" 61 #endif 62 #ifndef MAKE_META_IGNORE_PATTERNS 63 #define MAKE_META_IGNORE_PATTERNS ".MAKE.META.IGNORE_PATTERNS" 64 #endif 65 #ifndef MAKE_META_IGNORE_FILTER 66 #define MAKE_META_IGNORE_FILTER ".MAKE.META.IGNORE_FILTER" 67 #endif 68 #ifndef MAKE_META_CMP_FILTER 69 #define MAKE_META_CMP_FILTER ".MAKE.META.CMP_FILTER" 70 #endif 71 72 bool useMeta = false; 73 static bool useFilemon = false; 74 static bool writeMeta = false; 75 static bool metaMissing = false; /* oodate if missing */ 76 static bool filemonMissing = false; /* oodate if missing */ 77 static bool metaEnv = false; /* don't save env unless asked */ 78 static bool metaVerbose = false; 79 static bool metaIgnoreCMDs = false; /* ignore CMDs in .meta files */ 80 static bool metaIgnorePatterns = false; /* do we need to do pattern matches */ 81 static bool metaIgnoreFilter = false; /* do we have more complex filtering? */ 82 static bool metaCmpFilter = false; /* do we have CMP_FILTER ? */ 83 static bool metaCurdirOk = false; /* write .meta in .CURDIR Ok? */ 84 static bool metaSilent = false; /* if we have a .meta be SILENT */ 85 86 extern bool 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 Punt("Could not dup filemon output: %s", strerror(errno)); 153 } 154 (void)fcntl(dupfd, F_SETFD, FD_CLOEXEC); 155 if (filemon_setfd(pbm->filemon, dupfd) == -1) { 156 Punt("Could not set filemon file descriptor: %s", strerror(errno)); 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 if (fflush(mfp) != 0) 195 Punt("Cannot write filemon data to meta file: %s", 196 strerror(errno)); 197 if (close(fd) < 0) 198 error = errno; 199 return error; 200 } 201 #endif 202 203 /* 204 * when realpath() fails, 205 * we use this, to clean up ./ and ../ 206 */ 207 static void 208 eat_dots(char *buf) 209 { 210 char *p; 211 212 while ((p = strstr(buf, "/./")) != NULL) 213 memmove(p, p + 2, strlen(p + 2) + 1); 214 215 while ((p = strstr(buf, "/../")) != NULL) { 216 char *p2 = p + 3; 217 if (p > buf) { 218 do { 219 p--; 220 } while (p > buf && *p != '/'); 221 } 222 if (*p == '/') 223 memmove(p, p2, strlen(p2) + 1); 224 else 225 return; /* can't happen? */ 226 } 227 } 228 229 static char * 230 meta_name(char *mname, size_t mnamelen, 231 const char *dname, 232 const char *tname, 233 const char *cwd) 234 { 235 char buf[MAXPATHLEN]; 236 char *rp, *cp; 237 const char *tname_base; 238 char *tp; 239 char *dtp; 240 size_t ldname; 241 242 /* 243 * Weed out relative paths from the target file name. 244 * We have to be careful though since if target is a 245 * symlink, the result will be unstable. 246 * So we use realpath() just to get the dirname, and leave the 247 * basename as given to us. 248 */ 249 if ((tname_base = strrchr(tname, '/')) != NULL) { 250 if (cached_realpath(tname, buf) != NULL) { 251 if ((rp = strrchr(buf, '/')) != NULL) { 252 rp++; 253 tname_base++; 254 if (strcmp(tname_base, rp) != 0) 255 strlcpy(rp, tname_base, sizeof buf - (size_t)(rp - buf)); 256 } 257 tname = buf; 258 } else { 259 /* 260 * We likely have a directory which is about to be made. 261 * We pretend realpath() succeeded, to have a chance 262 * of generating the same meta file name that we will 263 * next time through. 264 */ 265 if (tname[0] == '/') { 266 strlcpy(buf, tname, sizeof buf); 267 } else { 268 snprintf(buf, sizeof buf, "%s/%s", cwd, tname); 269 } 270 eat_dots(buf); 271 tname = buf; 272 } 273 } 274 /* on some systems dirname may modify its arg */ 275 tp = bmake_strdup(tname); 276 dtp = dirname(tp); 277 if (strcmp(dname, dtp) == 0) { 278 if (snprintf(mname, mnamelen, "%s.meta", tname) >= (int)mnamelen) 279 mname[mnamelen - 1] = '\0'; 280 } else { 281 int x; 282 283 ldname = strlen(dname); 284 if (strncmp(dname, dtp, ldname) == 0 && dtp[ldname] == '/') 285 x = snprintf(mname, mnamelen, "%s/%s.meta", dname, &tname[ldname+1]); 286 else 287 x = snprintf(mname, mnamelen, "%s/%s.meta", dname, tname); 288 if (x >= (int)mnamelen) 289 mname[mnamelen - 1] = '\0'; 290 /* 291 * Replace path separators in the file name after the 292 * current object directory path. 293 */ 294 cp = mname + strlen(dname) + 1; 295 296 while (*cp != '\0') { 297 if (*cp == '/') 298 *cp = '_'; 299 cp++; 300 } 301 } 302 free(tp); 303 return mname; 304 } 305 306 /* 307 * Return true if running ${.MAKE} 308 * Bypassed if target is flagged .MAKE 309 */ 310 static bool 311 is_submake(const char *cmd, GNode *gn) 312 { 313 static const char *p_make = NULL; 314 static size_t p_len; 315 char *mp = NULL; 316 const char *cp2; 317 bool rc = false; 318 319 if (p_make == NULL) { 320 p_make = Var_Value(gn, ".MAKE").str; 321 p_len = strlen(p_make); 322 } 323 if (strchr(cmd, '$') != NULL) { 324 mp = Var_Subst(cmd, gn, VARE_WANTRES); 325 /* TODO: handle errors */ 326 cmd = mp; 327 } 328 cp2 = strstr(cmd, p_make); 329 if (cp2 != NULL) { 330 switch (cp2[p_len]) { 331 case '\0': 332 case ' ': 333 case '\t': 334 case '\n': 335 rc = true; 336 break; 337 } 338 if (cp2 > cmd && rc) { 339 switch (cp2[-1]) { 340 case ' ': 341 case '\t': 342 case '\n': 343 break; 344 default: 345 rc = false; /* no match */ 346 break; 347 } 348 } 349 } 350 free(mp); 351 return rc; 352 } 353 354 static bool 355 any_is_submake(GNode *gn) 356 { 357 StringListNode *ln; 358 359 for (ln = gn->commands.first; ln != NULL; ln = ln->next) 360 if (is_submake(ln->datum, gn)) 361 return true; 362 return false; 363 } 364 365 static void 366 printCMD(const char *ucmd, FILE *fp, GNode *gn) 367 { 368 FStr xcmd = FStr_InitRefer(ucmd); 369 370 Var_Expand(&xcmd, gn, VARE_WANTRES); 371 fprintf(fp, "CMD %s\n", xcmd.str); 372 FStr_Done(&xcmd); 373 } 374 375 static void 376 printCMDs(GNode *gn, FILE *fp) 377 { 378 StringListNode *ln; 379 380 for (ln = gn->commands.first; ln != NULL; ln = ln->next) 381 printCMD(ln->datum, fp, gn); 382 } 383 384 /* 385 * Certain node types never get a .meta file 386 */ 387 #define SKIP_META_TYPE(flag, str) do { \ 388 if ((gn->type & (flag))) { \ 389 if (verbose) \ 390 debug_printf("Skipping meta for %s: .%s\n", gn->name, str); \ 391 return false; \ 392 } \ 393 } while (false) 394 395 396 /* 397 * Do we need/want a .meta file ? 398 */ 399 static bool 400 meta_needed(GNode *gn, const char *dname, 401 char *objdir_realpath, bool verbose) 402 { 403 struct cached_stat cst; 404 405 if (verbose) 406 verbose = DEBUG(META); 407 408 /* This may be a phony node which we don't want meta data for... */ 409 /* Skip .meta for .BEGIN, .END, .ERROR etc as well. */ 410 /* Or it may be explicitly flagged as .NOMETA */ 411 SKIP_META_TYPE(OP_NOMETA, "NOMETA"); 412 /* Unless it is explicitly flagged as .META */ 413 if (!(gn->type & OP_META)) { 414 SKIP_META_TYPE(OP_PHONY, "PHONY"); 415 SKIP_META_TYPE(OP_SPECIAL, "SPECIAL"); 416 SKIP_META_TYPE(OP_MAKE, "MAKE"); 417 } 418 419 /* Check if there are no commands to execute. */ 420 if (Lst_IsEmpty(&gn->commands)) { 421 if (verbose) 422 debug_printf("Skipping meta for %s: no commands\n", 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 (any_is_submake(gn)) { 428 DEBUG1(META, "Skipping meta for %s: .SUBMAKE\n", gn->name); 429 return false; 430 } 431 } 432 433 /* The object directory may not exist. Check it.. */ 434 if (cached_stat(dname, &cst) != 0) { 435 if (verbose) 436 debug_printf("Skipping meta for %s: no .OBJDIR\n", gn->name); 437 return false; 438 } 439 440 /* make sure these are canonical */ 441 if (cached_realpath(dname, objdir_realpath) != NULL) 442 dname = objdir_realpath; 443 444 /* If we aren't in the object directory, don't create a meta file. */ 445 if (!metaCurdirOk && strcmp(curdir, dname) == 0) { 446 if (verbose) 447 debug_printf("Skipping meta for %s: .OBJDIR == .CURDIR\n", 448 gn->name); 449 return false; 450 } 451 return true; 452 } 453 454 455 static FILE * 456 meta_create(BuildMon *pbm, GNode *gn) 457 { 458 FILE *fp; 459 char buf[MAXPATHLEN]; 460 char objdir_realpath[MAXPATHLEN]; 461 char **ptr; 462 FStr dname; 463 const char *tname; 464 char *fname; 465 const char *cp; 466 467 fp = NULL; 468 469 dname = Var_Value(gn, ".OBJDIR"); 470 tname = GNode_VarTarget(gn); 471 472 /* if this succeeds objdir_realpath is realpath of dname */ 473 if (!meta_needed(gn, dname.str, objdir_realpath, true)) 474 goto out; 475 dname.str = objdir_realpath; 476 477 if (metaVerbose) { 478 /* Describe the target we are building */ 479 char *mp = Var_Subst("${" MAKE_META_PREFIX "}", gn, VARE_WANTRES); 480 /* TODO: handle errors */ 481 if (mp[0] != '\0') 482 fprintf(stdout, "%s\n", mp); 483 free(mp); 484 } 485 /* Get the basename of the target */ 486 cp = str_basename(tname); 487 488 fflush(stdout); 489 490 if (!writeMeta) 491 /* Don't create meta data. */ 492 goto out; 493 494 fname = meta_name(pbm->meta_fname, sizeof pbm->meta_fname, 495 dname.str, tname, objdir_realpath); 496 497 #ifdef DEBUG_META_MODE 498 DEBUG1(META, "meta_create: %s\n", fname); 499 #endif 500 501 if ((fp = fopen(fname, "w")) == NULL) 502 Punt("Could not open meta file '%s': %s", fname, strerror(errno)); 503 504 fprintf(fp, "# Meta data file %s\n", fname); 505 506 printCMDs(gn, fp); 507 508 fprintf(fp, "CWD %s\n", getcwd(buf, sizeof buf)); 509 fprintf(fp, "TARGET %s\n", tname); 510 cp = GNode_VarOodate(gn); 511 if (cp != NULL && *cp != '\0') { 512 fprintf(fp, "OODATE %s\n", cp); 513 } 514 if (metaEnv) { 515 for (ptr = environ; *ptr != NULL; ptr++) 516 fprintf(fp, "ENV %s\n", *ptr); 517 } 518 519 fprintf(fp, "-- command output --\n"); 520 if (fflush(fp) != 0) 521 Punt("Cannot write expanded command to meta file: %s", 522 strerror(errno)); 523 524 Global_Append(".MAKE.META.FILES", fname); 525 Global_Append(".MAKE.META.CREATED", fname); 526 527 gn->type |= OP_META; /* in case anyone wants to know */ 528 if (metaSilent) { 529 gn->type |= OP_SILENT; 530 } 531 out: 532 FStr_Done(&dname); 533 534 return fp; 535 } 536 537 static bool 538 boolValue(const char *s) 539 { 540 switch (*s) { 541 case '0': 542 case 'N': 543 case 'n': 544 case 'F': 545 case 'f': 546 return false; 547 } 548 return true; 549 } 550 551 /* 552 * Initialization we need before reading makefiles. 553 */ 554 void 555 meta_init(void) 556 { 557 #ifdef USE_FILEMON 558 /* this allows makefiles to test if we have filemon support */ 559 Global_Set(".MAKE.PATH_FILEMON", filemon_path()); 560 #endif 561 } 562 563 564 #define get_mode_bf(bf, token) \ 565 if ((cp = strstr(make_mode, token)) != NULL) \ 566 bf = boolValue(cp + sizeof (token) - 1) 567 568 /* 569 * Initialization we need after reading makefiles. 570 */ 571 void 572 meta_mode_init(const char *make_mode) 573 { 574 static bool once = false; 575 const char *cp; 576 577 useMeta = true; 578 useFilemon = true; 579 writeMeta = true; 580 581 if (make_mode != NULL) { 582 if (strstr(make_mode, "env") != NULL) 583 metaEnv = true; 584 if (strstr(make_mode, "verb") != NULL) 585 metaVerbose = true; 586 if (strstr(make_mode, "read") != NULL) 587 writeMeta = false; 588 if (strstr(make_mode, "nofilemon") != NULL) 589 useFilemon = false; 590 if (strstr(make_mode, "ignore-cmd") != NULL) 591 metaIgnoreCMDs = true; 592 if (useFilemon) 593 get_mode_bf(filemonMissing, "missing-filemon="); 594 get_mode_bf(metaCurdirOk, "curdirok="); 595 get_mode_bf(metaMissing, "missing-meta="); 596 get_mode_bf(metaSilent, "silent="); 597 } 598 if (metaVerbose && !Var_Exists(SCOPE_GLOBAL, MAKE_META_PREFIX)) { 599 /* 600 * The default value for MAKE_META_PREFIX 601 * prints the absolute path of the target. 602 * This works be cause :H will generate '.' if there is no / 603 * and :tA will resolve that to cwd. 604 */ 605 Global_Set(MAKE_META_PREFIX, 606 "Building ${.TARGET:H:tA}/${.TARGET:T}"); 607 } 608 if (once) 609 return; 610 once = true; 611 memset(&Mybm, 0, sizeof Mybm); 612 /* 613 * We consider ourselves master of all within ${.MAKE.META.BAILIWICK} 614 */ 615 metaBailiwickStr = Var_Subst("${.MAKE.META.BAILIWICK:O:u:tA}", 616 SCOPE_GLOBAL, VARE_WANTRES); 617 /* TODO: handle errors */ 618 str2Lst_Append(&metaBailiwick, metaBailiwickStr); 619 /* 620 * We ignore any paths that start with ${.MAKE.META.IGNORE_PATHS} 621 */ 622 Global_Append(MAKE_META_IGNORE_PATHS, 623 "/dev /etc /proc /tmp /var/run /var/tmp ${TMPDIR}"); 624 metaIgnorePathsStr = Var_Subst("${" MAKE_META_IGNORE_PATHS ":O:u:tA}", 625 SCOPE_GLOBAL, VARE_WANTRES); 626 /* TODO: handle errors */ 627 str2Lst_Append(&metaIgnorePaths, metaIgnorePathsStr); 628 629 /* 630 * We ignore any paths that match ${.MAKE.META.IGNORE_PATTERNS} 631 */ 632 metaIgnorePatterns = Var_Exists(SCOPE_GLOBAL, MAKE_META_IGNORE_PATTERNS); 633 metaIgnoreFilter = Var_Exists(SCOPE_GLOBAL, MAKE_META_IGNORE_FILTER); 634 metaCmpFilter = Var_Exists(SCOPE_GLOBAL, MAKE_META_CMP_FILTER); 635 } 636 637 MAKE_INLINE BuildMon * 638 BM(Job *job) 639 { 640 641 return ((job != NULL) ? &job->bm : &Mybm); 642 } 643 644 /* 645 * In each case below we allow for job==NULL 646 */ 647 void 648 meta_job_start(Job *job, GNode *gn) 649 { 650 BuildMon *pbm; 651 652 pbm = BM(job); 653 pbm->mfp = meta_create(pbm, gn); 654 #ifdef USE_FILEMON_ONCE 655 /* compat mode we open the filemon dev once per command */ 656 if (job == NULL) 657 return; 658 #endif 659 #ifdef USE_FILEMON 660 if (pbm->mfp != NULL && useFilemon) { 661 meta_open_filemon(pbm); 662 } else { 663 pbm->mon_fd = -1; 664 pbm->filemon = NULL; 665 } 666 #endif 667 } 668 669 /* 670 * The child calls this before doing anything. 671 * It does not disturb our state. 672 */ 673 void 674 meta_job_child(Job *job MAKE_ATTR_UNUSED) 675 { 676 #ifdef USE_FILEMON 677 BuildMon *pbm; 678 679 pbm = BM(job); 680 if (pbm->mfp != NULL) { 681 close(fileno(pbm->mfp)); 682 if (useFilemon && pbm->filemon != NULL) { 683 pid_t pid; 684 685 pid = getpid(); 686 if (filemon_setpid_child(pbm->filemon, pid) == -1) { 687 Punt("Could not set filemon pid: %s", strerror(errno)); 688 } 689 } 690 } 691 #endif 692 } 693 694 void 695 meta_job_parent(Job *job MAKE_ATTR_UNUSED, pid_t pid MAKE_ATTR_UNUSED) 696 { 697 #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV) 698 BuildMon *pbm; 699 700 pbm = BM(job); 701 if (useFilemon && pbm->filemon != NULL) { 702 filemon_setpid_parent(pbm->filemon, pid); 703 } 704 #endif 705 } 706 707 int 708 meta_job_fd(Job *job MAKE_ATTR_UNUSED) 709 { 710 #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV) 711 BuildMon *pbm; 712 713 pbm = BM(job); 714 if (useFilemon && pbm->filemon != NULL) { 715 return filemon_readfd(pbm->filemon); 716 } 717 #endif 718 return -1; 719 } 720 721 int 722 meta_job_event(Job *job MAKE_ATTR_UNUSED) 723 { 724 #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV) 725 BuildMon *pbm; 726 727 pbm = BM(job); 728 if (useFilemon && pbm->filemon != NULL) { 729 return filemon_process(pbm->filemon); 730 } 731 #endif 732 return 0; 733 } 734 735 void 736 meta_job_error(Job *job, GNode *gn, bool ignerr, int status) 737 { 738 char cwd[MAXPATHLEN]; 739 BuildMon *pbm; 740 741 pbm = BM(job); 742 if (job != NULL && gn == NULL) 743 gn = job->node; 744 if (pbm->mfp != NULL) { 745 fprintf(pbm->mfp, "\n*** Error code %d%s\n", 746 status, ignerr ? "(ignored)" : ""); 747 } 748 if (gn != NULL) 749 Global_Set(".ERROR_TARGET", GNode_Path(gn)); 750 if (getcwd(cwd, sizeof cwd) == NULL) 751 Punt("Cannot get cwd: %s", strerror(errno)); 752 753 Global_Set(".ERROR_CWD", cwd); 754 if (pbm->meta_fname[0] != '\0') { 755 Global_Set(".ERROR_META_FILE", pbm->meta_fname); 756 } 757 meta_job_finish(job); 758 } 759 760 void 761 meta_job_output(Job *job, char *cp, const char *nl) 762 { 763 BuildMon *pbm; 764 765 pbm = BM(job); 766 if (pbm->mfp != NULL) { 767 if (metaVerbose) { 768 static char *meta_prefix = NULL; 769 static size_t meta_prefix_len; 770 771 if (meta_prefix == NULL) { 772 char *cp2; 773 774 meta_prefix = Var_Subst("${" MAKE_META_PREFIX "}", 775 SCOPE_GLOBAL, VARE_WANTRES); 776 /* TODO: handle errors */ 777 if ((cp2 = strchr(meta_prefix, '$')) != NULL) 778 meta_prefix_len = (size_t)(cp2 - meta_prefix); 779 else 780 meta_prefix_len = strlen(meta_prefix); 781 } 782 if (strncmp(cp, meta_prefix, meta_prefix_len) == 0) { 783 cp = strchr(cp + 1, '\n'); 784 if (cp == NULL) 785 return; 786 cp++; 787 } 788 } 789 fprintf(pbm->mfp, "%s%s", cp, nl); 790 } 791 } 792 793 int 794 meta_cmd_finish(void *pbmp) 795 { 796 int error = 0; 797 BuildMon *pbm = pbmp; 798 #ifdef USE_FILEMON 799 int x; 800 #endif 801 802 if (pbm == NULL) 803 pbm = &Mybm; 804 805 #ifdef USE_FILEMON 806 if (pbm->filemon != NULL) { 807 while (filemon_process(pbm->filemon) > 0) 808 continue; 809 if (filemon_close(pbm->filemon) == -1) { 810 error = errno; 811 Punt("filemon failed: %s", strerror(errno)); 812 } 813 x = filemon_read(pbm->mfp, pbm->mon_fd); 814 if (error == 0 && x != 0) 815 error = x; 816 pbm->mon_fd = -1; 817 pbm->filemon = NULL; 818 return error; 819 } 820 #endif 821 822 fprintf(pbm->mfp, "\n"); /* ensure end with newline */ 823 return error; 824 } 825 826 int 827 meta_job_finish(Job *job) 828 { 829 BuildMon *pbm; 830 int error = 0; 831 int x; 832 833 pbm = BM(job); 834 if (pbm->mfp != NULL) { 835 error = meta_cmd_finish(pbm); 836 x = fclose(pbm->mfp); 837 if (error == 0 && x != 0) 838 error = errno; 839 pbm->mfp = NULL; 840 pbm->meta_fname[0] = '\0'; 841 } 842 return error; 843 } 844 845 void 846 meta_finish(void) 847 { 848 Lst_Done(&metaBailiwick); 849 free(metaBailiwickStr); 850 Lst_Done(&metaIgnorePaths); 851 free(metaIgnorePathsStr); 852 } 853 854 /* 855 * Fetch a full line from fp - growing bufp if needed 856 * Return length in bufp. 857 */ 858 static int 859 fgetLine(char **bufp, size_t *szp, int o, FILE *fp) 860 { 861 char *buf = *bufp; 862 size_t bufsz = *szp; 863 struct stat fs; 864 int x; 865 866 if (fgets(&buf[o], (int)bufsz - o, fp) != NULL) { 867 check_newline: 868 x = o + (int)strlen(&buf[o]); 869 if (buf[x - 1] == '\n') 870 return x; 871 /* 872 * We need to grow the buffer. 873 * The meta file can give us a clue. 874 */ 875 if (fstat(fileno(fp), &fs) == 0) { 876 size_t newsz; 877 char *p; 878 879 newsz = ROUNDUP(((size_t)fs.st_size / 2), BUFSIZ); 880 if (newsz <= bufsz) 881 newsz = ROUNDUP((size_t)fs.st_size, BUFSIZ); 882 if (newsz <= bufsz) 883 return x; /* truncated */ 884 DEBUG2(META, "growing buffer %u -> %u\n", 885 (unsigned)bufsz, (unsigned)newsz); 886 p = bmake_realloc(buf, newsz); 887 *bufp = buf = p; 888 *szp = bufsz = newsz; 889 /* fetch the rest */ 890 if (fgets(&buf[x], (int)bufsz - x, fp) == NULL) 891 return x; /* truncated! */ 892 goto check_newline; 893 } 894 } 895 return 0; 896 } 897 898 static bool 899 prefix_match(const char *prefix, const char *path) 900 { 901 size_t n = strlen(prefix); 902 903 return strncmp(path, prefix, n) == 0; 904 } 905 906 static bool 907 has_any_prefix(const char *path, StringList *prefixes) 908 { 909 StringListNode *ln; 910 911 for (ln = prefixes->first; ln != NULL; ln = ln->next) 912 if (prefix_match(ln->datum, path)) 913 return true; 914 return false; 915 } 916 917 /* See if the path equals prefix or starts with "prefix/". */ 918 static bool 919 path_starts_with(const char *path, const char *prefix) 920 { 921 size_t n = strlen(prefix); 922 923 if (strncmp(path, prefix, n) != 0) 924 return false; 925 return path[n] == '\0' || path[n] == '/'; 926 } 927 928 static bool 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 (has_any_prefix(fname, &metaIgnorePaths)) { 939 #ifdef DEBUG_META_MODE 940 DEBUG1(META, "meta_oodate: ignoring path: %s\n", p); 941 #endif 942 return true; 943 } 944 } 945 946 if (metaIgnorePatterns) { 947 const char *expr; 948 char *pm; 949 950 /* 951 * XXX: This variable is set on a target GNode but is not one of 952 * the usual local variables. It should be deleted afterwards. 953 * Ideally it would not be created in the first place, just like 954 * in a .for loop. 955 */ 956 Var_Set(gn, ".p.", p); 957 expr = "${" MAKE_META_IGNORE_PATTERNS ":@m@${.p.:M$m}@}"; 958 pm = Var_Subst(expr, gn, VARE_WANTRES); 959 /* TODO: handle errors */ 960 if (pm[0] != '\0') { 961 #ifdef DEBUG_META_MODE 962 DEBUG1(META, "meta_oodate: ignoring pattern: %s\n", p); 963 #endif 964 free(pm); 965 return true; 966 } 967 free(pm); 968 } 969 970 if (metaIgnoreFilter) { 971 char *fm; 972 973 /* skip if filter result is empty */ 974 snprintf(fname, sizeof fname, 975 "${%s:L:${%s:ts:}}", 976 p, MAKE_META_IGNORE_FILTER); 977 fm = Var_Subst(fname, gn, VARE_WANTRES); 978 /* TODO: handle errors */ 979 if (*fm == '\0') { 980 #ifdef DEBUG_META_MODE 981 DEBUG1(META, "meta_oodate: ignoring filtered: %s\n", p); 982 #endif 983 free(fm); 984 return true; 985 } 986 free(fm); 987 } 988 return false; 989 } 990 991 /* 992 * When running with 'meta' functionality, a target can be out-of-date 993 * if any of the references in its meta data file is more recent. 994 * We have to track the latestdir on a per-process basis. 995 */ 996 #define LCWD_VNAME_FMT ".meta.%d.lcwd" 997 #define LDIR_VNAME_FMT ".meta.%d.ldir" 998 999 /* 1000 * It is possible that a .meta file is corrupted, 1001 * if we detect this we want to reproduce it. 1002 * Setting oodate true will have that effect. 1003 */ 1004 #define CHECK_VALID_META(p) if (!(p != NULL && *p != '\0')) { \ 1005 warnx("%s: %u: malformed", fname, lineno); \ 1006 oodate = true; \ 1007 continue; \ 1008 } 1009 1010 #define DEQUOTE(p) if (*p == '\'') { \ 1011 char *ep; \ 1012 p++; \ 1013 if ((ep = strchr(p, '\'')) != NULL) \ 1014 *ep = '\0'; \ 1015 } 1016 1017 static void 1018 append_if_new(StringList *list, const char *str) 1019 { 1020 StringListNode *ln; 1021 1022 for (ln = list->first; ln != NULL; ln = ln->next) 1023 if (strcmp(ln->datum, str) == 0) 1024 return; 1025 Lst_Append(list, bmake_strdup(str)); 1026 } 1027 1028 /* A "reserved" variable to store the command to be filtered */ 1029 #define META_CMD_FILTER_VAR ".MAKE.cmd_filtered" 1030 1031 static char * 1032 meta_filter_cmd(GNode *gn, char *s) 1033 { 1034 Var_Set(gn, META_CMD_FILTER_VAR, s); 1035 s = Var_Subst( 1036 "${" META_CMD_FILTER_VAR ":${" MAKE_META_CMP_FILTER ":ts:}}", 1037 gn, VARE_WANTRES); 1038 return s; 1039 } 1040 1041 static int 1042 meta_cmd_cmp(GNode *gn, char *a, char *b, bool filter) 1043 { 1044 int rc; 1045 1046 rc = strcmp(a, b); 1047 if (rc == 0 || !filter) 1048 return rc; 1049 a = meta_filter_cmd(gn, a); 1050 b = meta_filter_cmd(gn, b); 1051 rc = strcmp(a, b); 1052 free(a); 1053 free(b); 1054 Var_Delete(gn, META_CMD_FILTER_VAR); 1055 return rc; 1056 } 1057 1058 bool 1059 meta_oodate(GNode *gn, bool oodate) 1060 { 1061 static char *tmpdir = NULL; 1062 static char cwd[MAXPATHLEN]; 1063 char lcwd_vname[64]; 1064 char ldir_vname[64]; 1065 char lcwd[MAXPATHLEN]; 1066 char latestdir[MAXPATHLEN]; 1067 char fname[MAXPATHLEN]; 1068 char fname1[MAXPATHLEN]; 1069 char fname2[MAXPATHLEN]; 1070 char fname3[MAXPATHLEN]; 1071 FStr dname; 1072 const char *tname; 1073 char *p; 1074 char *link_src; 1075 char *move_target; 1076 static size_t cwdlen = 0; 1077 static size_t tmplen = 0; 1078 FILE *fp; 1079 bool needOODATE = false; 1080 StringList missingFiles; 1081 bool have_filemon = false; 1082 bool cmp_filter; 1083 1084 if (oodate) 1085 return oodate; /* we're done */ 1086 1087 dname = Var_Value(gn, ".OBJDIR"); 1088 tname = GNode_VarTarget(gn); 1089 1090 /* if this succeeds fname3 is realpath of dname */ 1091 if (!meta_needed(gn, dname.str, fname3, false)) 1092 goto oodate_out; 1093 dname.str = fname3; 1094 1095 Lst_Init(&missingFiles); 1096 1097 /* 1098 * We need to check if the target is out-of-date. This includes 1099 * checking if the expanded command has changed. This in turn 1100 * requires that all variables are set in the same way that they 1101 * would be if the target needs to be re-built. 1102 */ 1103 GNode_SetLocalVars(gn); 1104 1105 meta_name(fname, sizeof fname, dname.str, tname, dname.str); 1106 1107 #ifdef DEBUG_META_MODE 1108 DEBUG1(META, "meta_oodate: %s\n", fname); 1109 #endif 1110 1111 if ((fp = fopen(fname, "r")) != NULL) { 1112 static char *buf = NULL; 1113 static size_t bufsz; 1114 unsigned lineno = 0; 1115 int lastpid = 0; 1116 int pid; 1117 int x; 1118 StringListNode *cmdNode; 1119 struct cached_stat cst; 1120 1121 if (buf == NULL) { 1122 bufsz = 8 * BUFSIZ; 1123 buf = bmake_malloc(bufsz); 1124 } 1125 1126 if (cwdlen == 0) { 1127 if (getcwd(cwd, sizeof cwd) == NULL) 1128 err(1, "Could not get current working directory"); 1129 cwdlen = strlen(cwd); 1130 } 1131 strlcpy(lcwd, cwd, sizeof lcwd); 1132 strlcpy(latestdir, cwd, sizeof latestdir); 1133 1134 if (tmpdir == NULL) { 1135 tmpdir = getTmpdir(); 1136 tmplen = strlen(tmpdir); 1137 } 1138 1139 /* we want to track all the .meta we read */ 1140 Global_Append(".MAKE.META.FILES", fname); 1141 1142 cmp_filter = metaCmpFilter || Var_Exists(gn, MAKE_META_CMP_FILTER); 1143 1144 cmdNode = gn->commands.first; 1145 while (!oodate && (x = fgetLine(&buf, &bufsz, 0, fp)) > 0) { 1146 lineno++; 1147 if (buf[x - 1] == '\n') 1148 buf[x - 1] = '\0'; 1149 else { 1150 warnx("%s: %u: line truncated at %u", fname, lineno, x); 1151 oodate = true; 1152 break; 1153 } 1154 link_src = NULL; 1155 move_target = NULL; 1156 /* Find the start of the build monitor section. */ 1157 if (!have_filemon) { 1158 if (strncmp(buf, "-- filemon", 10) == 0) { 1159 have_filemon = true; 1160 continue; 1161 } 1162 if (strncmp(buf, "# buildmon", 10) == 0) { 1163 have_filemon = true; 1164 continue; 1165 } 1166 } 1167 1168 /* Delimit the record type. */ 1169 p = buf; 1170 #ifdef DEBUG_META_MODE 1171 DEBUG3(META, "%s: %u: %s\n", fname, lineno, buf); 1172 #endif 1173 strsep(&p, " "); 1174 if (have_filemon) { 1175 /* 1176 * We are in the 'filemon' output section. 1177 * Each record from filemon follows the general form: 1178 * 1179 * <key> <pid> <data> 1180 * 1181 * Where: 1182 * <key> is a single letter, denoting the syscall. 1183 * <pid> is the process that made the syscall. 1184 * <data> is the arguments (of interest). 1185 */ 1186 switch(buf[0]) { 1187 case '#': /* comment */ 1188 case 'V': /* version */ 1189 break; 1190 default: 1191 /* 1192 * We need to track pathnames per-process. 1193 * 1194 * Each process run by make starts off in the 'CWD' 1195 * recorded in the .meta file, if it chdirs ('C') 1196 * elsewhere we need to track that - but only for 1197 * that process. If it forks ('F'), we initialize 1198 * the child to have the same cwd as its parent. 1199 * 1200 * We also need to track the 'latestdir' of 1201 * interest. This is usually the same as cwd, but 1202 * not if a process is reading directories. 1203 * 1204 * Each time we spot a different process ('pid') 1205 * we save the current value of 'latestdir' in a 1206 * variable qualified by 'lastpid', and 1207 * re-initialize 'latestdir' to any pre-saved 1208 * value for the current 'pid' and 'CWD' if none. 1209 */ 1210 CHECK_VALID_META(p); 1211 pid = atoi(p); 1212 if (pid > 0 && pid != lastpid) { 1213 FStr ldir; 1214 1215 if (lastpid > 0) { 1216 /* We need to remember these. */ 1217 Global_Set(lcwd_vname, lcwd); 1218 Global_Set(ldir_vname, latestdir); 1219 } 1220 snprintf(lcwd_vname, sizeof lcwd_vname, LCWD_VNAME_FMT, pid); 1221 snprintf(ldir_vname, sizeof ldir_vname, LDIR_VNAME_FMT, pid); 1222 lastpid = pid; 1223 ldir = Var_Value(SCOPE_GLOBAL, ldir_vname); 1224 if (ldir.str != NULL) { 1225 strlcpy(latestdir, ldir.str, sizeof latestdir); 1226 FStr_Done(&ldir); 1227 } 1228 ldir = Var_Value(SCOPE_GLOBAL, lcwd_vname); 1229 if (ldir.str != NULL) { 1230 strlcpy(lcwd, ldir.str, sizeof lcwd); 1231 FStr_Done(&ldir); 1232 } 1233 } 1234 /* Skip past the pid. */ 1235 if (strsep(&p, " ") == NULL) 1236 continue; 1237 #ifdef DEBUG_META_MODE 1238 if (DEBUG(META)) 1239 debug_printf("%s: %u: %d: %c: cwd=%s lcwd=%s ldir=%s\n", 1240 fname, lineno, 1241 pid, buf[0], cwd, lcwd, latestdir); 1242 #endif 1243 break; 1244 } 1245 1246 CHECK_VALID_META(p); 1247 1248 /* Process according to record type. */ 1249 switch (buf[0]) { 1250 case 'X': /* eXit */ 1251 Var_Delete(SCOPE_GLOBAL, lcwd_vname); 1252 Var_Delete(SCOPE_GLOBAL, ldir_vname); 1253 lastpid = 0; /* no need to save ldir_vname */ 1254 break; 1255 1256 case 'F': /* [v]Fork */ 1257 { 1258 char cldir[64]; 1259 int child; 1260 1261 child = atoi(p); 1262 if (child > 0) { 1263 snprintf(cldir, sizeof cldir, LCWD_VNAME_FMT, child); 1264 Global_Set(cldir, lcwd); 1265 snprintf(cldir, sizeof cldir, LDIR_VNAME_FMT, child); 1266 Global_Set(cldir, latestdir); 1267 #ifdef DEBUG_META_MODE 1268 if (DEBUG(META)) 1269 debug_printf( 1270 "%s: %u: %d: cwd=%s lcwd=%s ldir=%s\n", 1271 fname, lineno, 1272 child, cwd, lcwd, latestdir); 1273 #endif 1274 } 1275 } 1276 break; 1277 1278 case 'C': /* Chdir */ 1279 /* Update lcwd and latest directory. */ 1280 strlcpy(latestdir, p, sizeof latestdir); 1281 strlcpy(lcwd, p, sizeof lcwd); 1282 Global_Set(lcwd_vname, lcwd); 1283 Global_Set(ldir_vname, lcwd); 1284 #ifdef DEBUG_META_MODE 1285 DEBUG4(META, "%s: %u: cwd=%s ldir=%s\n", 1286 fname, lineno, cwd, lcwd); 1287 #endif 1288 break; 1289 1290 case 'M': /* renaMe */ 1291 /* 1292 * For 'M'oves we want to check 1293 * the src as for 'R'ead 1294 * and the target as for 'W'rite. 1295 */ 1296 { 1297 char *cp = p; /* save this for a second */ 1298 /* now get target */ 1299 if (strsep(&p, " ") == NULL) 1300 continue; 1301 CHECK_VALID_META(p); 1302 move_target = p; 1303 p = cp; 1304 } 1305 /* 'L' and 'M' put single quotes around the args */ 1306 DEQUOTE(p); 1307 DEQUOTE(move_target); 1308 /* FALLTHROUGH */ 1309 case 'D': /* unlink */ 1310 if (*p == '/') { 1311 /* remove any missingFiles entries that match p */ 1312 StringListNode *ln = missingFiles.first; 1313 while (ln != NULL) { 1314 StringListNode *next = ln->next; 1315 if (path_starts_with(ln->datum, p)) { 1316 free(ln->datum); 1317 Lst_Remove(&missingFiles, ln); 1318 } 1319 ln = next; 1320 } 1321 } 1322 if (buf[0] == 'M') { 1323 /* the target of the mv is a file 'W'ritten */ 1324 #ifdef DEBUG_META_MODE 1325 DEBUG2(META, "meta_oodate: M %s -> %s\n", 1326 p, move_target); 1327 #endif 1328 p = move_target; 1329 goto check_write; 1330 } 1331 break; 1332 case 'L': /* Link */ 1333 /* 1334 * For 'L'inks check 1335 * the src as for 'R'ead 1336 * and the target as for 'W'rite. 1337 */ 1338 link_src = p; 1339 /* now get target */ 1340 if (strsep(&p, " ") == NULL) 1341 continue; 1342 CHECK_VALID_META(p); 1343 /* 'L' and 'M' put single quotes around the args */ 1344 DEQUOTE(p); 1345 DEQUOTE(link_src); 1346 #ifdef DEBUG_META_MODE 1347 DEBUG2(META, "meta_oodate: L %s -> %s\n", link_src, p); 1348 #endif 1349 /* FALLTHROUGH */ 1350 case 'W': /* Write */ 1351 check_write: 1352 /* 1353 * If a file we generated within our bailiwick 1354 * but outside of .OBJDIR is missing, 1355 * we need to do it again. 1356 */ 1357 /* ignore non-absolute paths */ 1358 if (*p != '/') 1359 break; 1360 1361 if (Lst_IsEmpty(&metaBailiwick)) 1362 break; 1363 1364 /* ignore cwd - normal dependencies handle those */ 1365 if (strncmp(p, cwd, cwdlen) == 0) 1366 break; 1367 1368 if (!has_any_prefix(p, &metaBailiwick)) 1369 break; 1370 1371 /* tmpdir might be within */ 1372 if (tmplen > 0 && strncmp(p, tmpdir, tmplen) == 0) 1373 break; 1374 1375 /* ignore anything containing the string "tmp" */ 1376 /* XXX: The arguments to strstr must be swapped. */ 1377 if (strstr("tmp", p) != NULL) 1378 break; 1379 1380 if ((link_src != NULL && cached_lstat(p, &cst) < 0) || 1381 (link_src == NULL && cached_stat(p, &cst) < 0)) { 1382 if (!meta_ignore(gn, p)) 1383 append_if_new(&missingFiles, p); 1384 } 1385 break; 1386 check_link_src: 1387 p = link_src; 1388 link_src = NULL; 1389 #ifdef DEBUG_META_MODE 1390 DEBUG1(META, "meta_oodate: L src %s\n", p); 1391 #endif 1392 /* FALLTHROUGH */ 1393 case 'R': /* Read */ 1394 case 'E': /* Exec */ 1395 /* 1396 * Check for runtime files that can't 1397 * be part of the dependencies because 1398 * they are _expected_ to change. 1399 */ 1400 if (meta_ignore(gn, p)) 1401 break; 1402 1403 /* 1404 * The rest of the record is the file name. 1405 * Check if it's not an absolute path. 1406 */ 1407 { 1408 char *sdirs[4]; 1409 char **sdp; 1410 int sdx = 0; 1411 bool found = false; 1412 1413 if (*p == '/') { 1414 sdirs[sdx++] = p; /* done */ 1415 } else { 1416 if (strcmp(".", p) == 0) 1417 continue; /* no point */ 1418 1419 /* Check vs latestdir */ 1420 if (snprintf(fname1, sizeof fname1, "%s/%s", latestdir, p) < (int)(sizeof fname1)) 1421 sdirs[sdx++] = fname1; 1422 1423 if (strcmp(latestdir, lcwd) != 0) { 1424 /* Check vs lcwd */ 1425 if (snprintf(fname2, sizeof fname2, "%s/%s", lcwd, p) < (int)(sizeof fname2)) 1426 sdirs[sdx++] = fname2; 1427 } 1428 if (strcmp(lcwd, cwd) != 0) { 1429 /* Check vs cwd */ 1430 if (snprintf(fname3, sizeof fname3, "%s/%s", cwd, p) < (int)(sizeof fname3)) 1431 sdirs[sdx++] = fname3; 1432 } 1433 } 1434 sdirs[sdx++] = NULL; 1435 1436 for (sdp = sdirs; *sdp != NULL && !found; sdp++) { 1437 #ifdef DEBUG_META_MODE 1438 DEBUG3(META, "%s: %u: looking for: %s\n", 1439 fname, lineno, *sdp); 1440 #endif 1441 if (cached_stat(*sdp, &cst) == 0) { 1442 found = true; 1443 p = *sdp; 1444 } 1445 } 1446 if (found) { 1447 #ifdef DEBUG_META_MODE 1448 DEBUG3(META, "%s: %u: found: %s\n", 1449 fname, lineno, p); 1450 #endif 1451 if (!S_ISDIR(cst.cst_mode) && 1452 cst.cst_mtime > gn->mtime) { 1453 DEBUG3(META, "%s: %u: file '%s' is newer than the target...\n", 1454 fname, lineno, p); 1455 oodate = true; 1456 } else if (S_ISDIR(cst.cst_mode)) { 1457 /* Update the latest directory. */ 1458 cached_realpath(p, latestdir); 1459 } 1460 } else if (errno == ENOENT && *p == '/' && 1461 strncmp(p, cwd, cwdlen) != 0) { 1462 /* 1463 * A referenced file outside of CWD is missing. 1464 * We cannot catch every eventuality here... 1465 */ 1466 append_if_new(&missingFiles, p); 1467 } 1468 } 1469 if (buf[0] == 'E') { 1470 /* previous latestdir is no longer relevant */ 1471 strlcpy(latestdir, lcwd, sizeof latestdir); 1472 } 1473 break; 1474 default: 1475 break; 1476 } 1477 if (!oodate && buf[0] == 'L' && link_src != NULL) 1478 goto check_link_src; 1479 } else if (strcmp(buf, "CMD") == 0) { 1480 /* 1481 * Compare the current command with the one in the 1482 * meta data file. 1483 */ 1484 if (cmdNode == NULL) { 1485 DEBUG2(META, "%s: %u: there were more build commands in the meta data file than there are now...\n", 1486 fname, lineno); 1487 oodate = true; 1488 } else { 1489 const char *cp; 1490 char *cmd = cmdNode->datum; 1491 bool hasOODATE = false; 1492 1493 if (strstr(cmd, "$?") != NULL) 1494 hasOODATE = true; 1495 else if ((cp = strstr(cmd, ".OODATE")) != NULL) { 1496 /* check for $[{(].OODATE[:)}] */ 1497 if (cp > cmd + 2 && cp[-2] == '$') 1498 hasOODATE = true; 1499 } 1500 if (hasOODATE) { 1501 needOODATE = true; 1502 DEBUG2(META, "%s: %u: cannot compare command using .OODATE\n", 1503 fname, lineno); 1504 } 1505 cmd = Var_Subst(cmd, gn, VARE_UNDEFERR); 1506 /* TODO: handle errors */ 1507 1508 if ((cp = strchr(cmd, '\n')) != NULL) { 1509 int n; 1510 1511 /* 1512 * This command contains newlines, we need to 1513 * fetch more from the .meta file before we 1514 * attempt a comparison. 1515 */ 1516 /* first put the newline back at buf[x - 1] */ 1517 buf[x - 1] = '\n'; 1518 do { 1519 /* now fetch the next line */ 1520 if ((n = fgetLine(&buf, &bufsz, x, fp)) <= 0) 1521 break; 1522 x = n; 1523 lineno++; 1524 if (buf[x - 1] != '\n') { 1525 warnx("%s: %u: line truncated at %u", fname, lineno, x); 1526 break; 1527 } 1528 cp = strchr(cp + 1, '\n'); 1529 } while (cp != NULL); 1530 if (buf[x - 1] == '\n') 1531 buf[x - 1] = '\0'; 1532 } 1533 if (p != NULL && 1534 !hasOODATE && 1535 !(gn->type & OP_NOMETA_CMP) && 1536 (meta_cmd_cmp(gn, p, cmd, cmp_filter) != 0)) { 1537 DEBUG4(META, "%s: %u: a build command has changed\n%s\nvs\n%s\n", 1538 fname, lineno, p, cmd); 1539 if (!metaIgnoreCMDs) 1540 oodate = true; 1541 } 1542 free(cmd); 1543 cmdNode = cmdNode->next; 1544 } 1545 } else if (strcmp(buf, "CWD") == 0) { 1546 /* 1547 * Check if there are extra commands now 1548 * that weren't in the meta data file. 1549 */ 1550 if (!oodate && cmdNode != NULL) { 1551 DEBUG2(META, "%s: %u: there are extra build commands now that weren't in the meta data file\n", 1552 fname, lineno); 1553 oodate = true; 1554 } 1555 CHECK_VALID_META(p); 1556 if (strcmp(p, cwd) != 0) { 1557 DEBUG4(META, "%s: %u: the current working directory has changed from '%s' to '%s'\n", 1558 fname, lineno, p, curdir); 1559 oodate = true; 1560 } 1561 } 1562 } 1563 1564 fclose(fp); 1565 if (!Lst_IsEmpty(&missingFiles)) { 1566 DEBUG2(META, "%s: missing files: %s...\n", 1567 fname, (char *)missingFiles.first->datum); 1568 oodate = true; 1569 } 1570 if (!oodate && !have_filemon && filemonMissing) { 1571 DEBUG1(META, "%s: missing filemon data\n", fname); 1572 oodate = true; 1573 } 1574 } else { 1575 if (writeMeta && (metaMissing || (gn->type & OP_META))) { 1576 const char *cp = NULL; 1577 1578 /* if target is in .CURDIR we do not need a meta file */ 1579 if (gn->path != NULL && (cp = strrchr(gn->path, '/')) != NULL && 1580 (cp > gn->path)) { 1581 if (strncmp(curdir, gn->path, (size_t)(cp - gn->path)) != 0) { 1582 cp = NULL; /* not in .CURDIR */ 1583 } 1584 } 1585 if (cp == NULL) { 1586 DEBUG1(META, "%s: required but missing\n", fname); 1587 oodate = true; 1588 needOODATE = true; /* assume the worst */ 1589 } 1590 } 1591 } 1592 1593 Lst_DoneCall(&missingFiles, free); 1594 1595 if (oodate && needOODATE) { 1596 /* 1597 * Target uses .OODATE which is empty; or we wouldn't be here. 1598 * We have decided it is oodate, so .OODATE needs to be set. 1599 * All we can sanely do is set it to .ALLSRC. 1600 */ 1601 Var_Delete(gn, OODATE); 1602 Var_Set(gn, OODATE, GNode_VarAllsrc(gn)); 1603 } 1604 1605 oodate_out: 1606 FStr_Done(&dname); 1607 return oodate; 1608 } 1609 1610 /* support for compat mode */ 1611 1612 static int childPipe[2]; 1613 1614 void 1615 meta_compat_start(void) 1616 { 1617 #ifdef USE_FILEMON_ONCE 1618 /* 1619 * We need to re-open filemon for each cmd. 1620 */ 1621 BuildMon *pbm = &Mybm; 1622 1623 if (pbm->mfp != NULL && useFilemon) { 1624 meta_open_filemon(pbm); 1625 } else { 1626 pbm->mon_fd = -1; 1627 pbm->filemon = NULL; 1628 } 1629 #endif 1630 if (pipe(childPipe) < 0) 1631 Punt("Cannot create pipe: %s", strerror(errno)); 1632 /* Set close-on-exec flag for both */ 1633 (void)fcntl(childPipe[0], F_SETFD, FD_CLOEXEC); 1634 (void)fcntl(childPipe[1], F_SETFD, FD_CLOEXEC); 1635 } 1636 1637 void 1638 meta_compat_child(void) 1639 { 1640 meta_job_child(NULL); 1641 if (dup2(childPipe[1], 1) < 0 || dup2(1, 2) < 0) 1642 execDie("dup2", "pipe"); 1643 } 1644 1645 void 1646 meta_compat_parent(pid_t child) 1647 { 1648 int outfd, metafd, maxfd, nfds; 1649 char buf[BUFSIZ+1]; 1650 fd_set readfds; 1651 1652 meta_job_parent(NULL, child); 1653 close(childPipe[1]); /* child side */ 1654 outfd = childPipe[0]; 1655 #ifdef USE_FILEMON 1656 metafd = Mybm.filemon != NULL ? filemon_readfd(Mybm.filemon) : -1; 1657 #else 1658 metafd = -1; 1659 #endif 1660 maxfd = -1; 1661 if (outfd > maxfd) 1662 maxfd = outfd; 1663 if (metafd > maxfd) 1664 maxfd = metafd; 1665 1666 while (outfd != -1 || metafd != -1) { 1667 FD_ZERO(&readfds); 1668 if (outfd != -1) { 1669 FD_SET(outfd, &readfds); 1670 } 1671 if (metafd != -1) { 1672 FD_SET(metafd, &readfds); 1673 } 1674 nfds = select(maxfd + 1, &readfds, NULL, NULL, NULL); 1675 if (nfds == -1) { 1676 if (errno == EINTR) 1677 continue; 1678 err(1, "select"); 1679 } 1680 1681 if (outfd != -1 && FD_ISSET(outfd, &readfds) != 0) do { 1682 /* XXX this is not line-buffered */ 1683 ssize_t nread = read(outfd, buf, sizeof buf - 1); 1684 if (nread == -1) 1685 err(1, "read"); 1686 if (nread == 0) { 1687 close(outfd); 1688 outfd = -1; 1689 break; 1690 } 1691 fwrite(buf, 1, (size_t)nread, stdout); 1692 fflush(stdout); 1693 buf[nread] = '\0'; 1694 meta_job_output(NULL, buf, ""); 1695 } while (false); 1696 if (metafd != -1 && FD_ISSET(metafd, &readfds) != 0) { 1697 if (meta_job_event(NULL) <= 0) 1698 metafd = -1; 1699 } 1700 } 1701 } 1702 1703 #endif /* USE_META */ 1704