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