1 /* $NetBSD: meta.c,v 1.181 2021/04/04 10:05:08 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 #ifdef HAVE_LIBGEN_H
40 #include <libgen.h>
41 #elif !defined(HAVE_DIRNAME)
42 char * dirname(char *);
43 #endif
44 #include <errno.h>
45 #if !defined(HAVE_CONFIG_H) || defined(HAVE_ERR_H)
46 #include <err.h>
47 #endif
48
49 #include "make.h"
50 #include "dir.h"
51 #include "job.h"
52
53 #ifdef USE_FILEMON
54 #include "filemon/filemon.h"
55 #endif
56
57 static BuildMon Mybm; /* for compat */
58 static StringList metaBailiwick = LST_INIT; /* our scope of control */
59 static char *metaBailiwickStr; /* string storage for the list */
60 static StringList metaIgnorePaths = LST_INIT; /* paths we deliberately ignore */
61 static char *metaIgnorePathsStr; /* string storage for the list */
62
63 #ifndef MAKE_META_IGNORE_PATHS
64 #define MAKE_META_IGNORE_PATHS ".MAKE.META.IGNORE_PATHS"
65 #endif
66 #ifndef MAKE_META_IGNORE_PATTERNS
67 #define MAKE_META_IGNORE_PATTERNS ".MAKE.META.IGNORE_PATTERNS"
68 #endif
69 #ifndef MAKE_META_IGNORE_FILTER
70 #define MAKE_META_IGNORE_FILTER ".MAKE.META.IGNORE_FILTER"
71 #endif
72
73 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 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
meta_open_filemon(BuildMon * pbm)125 meta_open_filemon(BuildMon *pbm)
126 {
127 int dupfd;
128
129 pbm->mon_fd = -1;
130 pbm->filemon = NULL;
131 if (!useFilemon || pbm->mfp == NULL)
132 return;
133
134 pbm->filemon = filemon_open();
135 if (pbm->filemon == NULL) {
136 useFilemon = false;
137 warn("Could not open filemon %s", filemon_path());
138 return;
139 }
140
141 /*
142 * We use a file outside of '.'
143 * to avoid a FreeBSD kernel bug where unlink invalidates
144 * cwd causing getcwd to do a lot more work.
145 * We only care about the descriptor.
146 */
147 if (!opts.compatMake)
148 pbm->mon_fd = Job_TempFile("filemon.XXXXXX", NULL, 0);
149 else
150 pbm->mon_fd = mkTempFile("filemon.XXXXXX", NULL, 0);
151 if ((dupfd = dup(pbm->mon_fd)) == -1) {
152 err(1, "Could not dup filemon output!");
153 }
154 (void)fcntl(dupfd, F_SETFD, FD_CLOEXEC);
155 if (filemon_setfd(pbm->filemon, dupfd) == -1) {
156 err(1, "Could not set filemon file descriptor!");
157 }
158 /* we don't need these once we exec */
159 (void)fcntl(pbm->mon_fd, F_SETFD, FD_CLOEXEC);
160 }
161
162 /*
163 * Read the build monitor output file and write records to the target's
164 * metadata file.
165 */
166 static int
filemon_read(FILE * mfp,int fd)167 filemon_read(FILE *mfp, int fd)
168 {
169 char buf[BUFSIZ];
170 int error;
171
172 /* Check if we're not writing to a meta data file.*/
173 if (mfp == NULL) {
174 if (fd >= 0)
175 close(fd); /* not interested */
176 return 0;
177 }
178 /* rewind */
179 if (lseek(fd, (off_t)0, SEEK_SET) < 0) {
180 error = errno;
181 warn("Could not rewind filemon");
182 fprintf(mfp, "\n");
183 } else {
184 ssize_t n;
185
186 error = 0;
187 fprintf(mfp, "\n-- filemon acquired metadata --\n");
188
189 while ((n = read(fd, buf, sizeof buf)) > 0) {
190 if ((ssize_t)fwrite(buf, 1, (size_t)n, mfp) < n)
191 error = EIO;
192 }
193 }
194 fflush(mfp);
195 if (close(fd) < 0)
196 error = errno;
197 return error;
198 }
199 #endif
200
201 /*
202 * when realpath() fails,
203 * we use this, to clean up ./ and ../
204 */
205 static void
eat_dots(char * buf,size_t bufsz,int dots)206 eat_dots(char *buf, size_t bufsz, int dots)
207 {
208 char *cp;
209 char *cp2;
210 const char *eat;
211 size_t eatlen;
212
213 switch (dots) {
214 case 1:
215 eat = "/./";
216 eatlen = 2;
217 break;
218 case 2:
219 eat = "/../";
220 eatlen = 3;
221 break;
222 default:
223 return;
224 }
225
226 do {
227 cp = strstr(buf, eat);
228 if (cp != NULL) {
229 cp2 = cp + eatlen;
230 if (dots == 2 && cp > buf) {
231 do {
232 cp--;
233 } while (cp > buf && *cp != '/');
234 }
235 if (*cp == '/') {
236 strlcpy(cp, cp2, bufsz - (size_t)(cp - buf));
237 } else {
238 return; /* can't happen? */
239 }
240 }
241 } while (cp != NULL);
242 }
243
244 static char *
meta_name(char * mname,size_t mnamelen,const char * dname,const char * tname,const char * cwd)245 meta_name(char *mname, size_t mnamelen,
246 const char *dname,
247 const char *tname,
248 const char *cwd)
249 {
250 char buf[MAXPATHLEN];
251 char *rp;
252 char *cp;
253 char *tp;
254 char *dtp;
255 size_t ldname;
256
257 /*
258 * Weed out relative paths from the target file name.
259 * We have to be careful though since if target is a
260 * symlink, the result will be unstable.
261 * So we use realpath() just to get the dirname, and leave the
262 * basename as given to us.
263 */
264 if ((cp = strrchr(tname, '/')) != NULL) {
265 if (cached_realpath(tname, buf) != NULL) {
266 if ((rp = strrchr(buf, '/')) != NULL) {
267 rp++;
268 cp++;
269 if (strcmp(cp, rp) != 0)
270 strlcpy(rp, cp, sizeof buf - (size_t)(rp - buf));
271 }
272 tname = buf;
273 } else {
274 /*
275 * We likely have a directory which is about to be made.
276 * We pretend realpath() succeeded, to have a chance
277 * of generating the same meta file name that we will
278 * next time through.
279 */
280 if (tname[0] == '/') {
281 strlcpy(buf, tname, sizeof buf);
282 } else {
283 snprintf(buf, sizeof buf, "%s/%s", cwd, tname);
284 }
285 eat_dots(buf, sizeof buf, 1); /* ./ */
286 eat_dots(buf, sizeof buf, 2); /* ../ */
287 tname = buf;
288 }
289 }
290 /* on some systems dirname may modify its arg */
291 tp = bmake_strdup(tname);
292 dtp = dirname(tp);
293 if (strcmp(dname, dtp) == 0)
294 snprintf(mname, mnamelen, "%s.meta", tname);
295 else {
296 ldname = strlen(dname);
297 if (strncmp(dname, dtp, ldname) == 0 && dtp[ldname] == '/')
298 snprintf(mname, mnamelen, "%s/%s.meta", dname, &tname[ldname+1]);
299 else
300 snprintf(mname, mnamelen, "%s/%s.meta", dname, tname);
301
302 /*
303 * Replace path separators in the file name after the
304 * current object directory path.
305 */
306 cp = mname + strlen(dname) + 1;
307
308 while (*cp != '\0') {
309 if (*cp == '/')
310 *cp = '_';
311 cp++;
312 }
313 }
314 free(tp);
315 return mname;
316 }
317
318 /*
319 * Return true if running ${.MAKE}
320 * Bypassed if target is flagged .MAKE
321 */
322 static bool
is_submake(const char * cmd,GNode * gn)323 is_submake(const char *cmd, GNode *gn)
324 {
325 static const char *p_make = NULL;
326 static size_t p_len;
327 char *mp = NULL;
328 char *cp;
329 char *cp2;
330 bool rc = false;
331
332 if (p_make == NULL) {
333 p_make = Var_Value(gn, ".MAKE").str;
334 p_len = strlen(p_make);
335 }
336 cp = strchr(cmd, '$');
337 if (cp != NULL) {
338 (void)Var_Subst(cmd, gn, VARE_WANTRES, &mp);
339 /* TODO: handle errors */
340 cmd = mp;
341 }
342 cp2 = strstr(cmd, p_make);
343 if (cp2 != NULL) {
344 switch (cp2[p_len]) {
345 case '\0':
346 case ' ':
347 case '\t':
348 case '\n':
349 rc = true;
350 break;
351 }
352 if (cp2 > cmd && rc) {
353 switch (cp2[-1]) {
354 case ' ':
355 case '\t':
356 case '\n':
357 break;
358 default:
359 rc = false; /* no match */
360 break;
361 }
362 }
363 }
364 free(mp);
365 return rc;
366 }
367
368 static bool
any_is_submake(GNode * gn)369 any_is_submake(GNode *gn)
370 {
371 StringListNode *ln;
372
373 for (ln = gn->commands.first; ln != NULL; ln = ln->next)
374 if (is_submake(ln->datum, gn))
375 return true;
376 return false;
377 }
378
379 static void
printCMD(const char * ucmd,FILE * fp,GNode * gn)380 printCMD(const char *ucmd, FILE *fp, GNode *gn)
381 {
382 FStr xcmd = FStr_InitRefer(ucmd);
383
384 if (strchr(ucmd, '$') != NULL) {
385 char *expanded;
386 (void)Var_Subst(ucmd, gn, VARE_WANTRES, &expanded);
387 /* TODO: handle errors */
388 xcmd = FStr_InitOwn(expanded);
389 }
390
391 fprintf(fp, "CMD %s\n", xcmd.str);
392 FStr_Done(&xcmd);
393 }
394
395 static void
printCMDs(GNode * gn,FILE * fp)396 printCMDs(GNode *gn, FILE *fp)
397 {
398 StringListNode *ln;
399
400 for (ln = gn->commands.first; ln != NULL; ln = ln->next)
401 printCMD(ln->datum, fp, gn);
402 }
403
404 /*
405 * Certain node types never get a .meta file
406 */
407 #define SKIP_META_TYPE(_type) do { \
408 if ((gn->type & __CONCAT(OP_, _type))) { \
409 if (verbose) { \
410 debug_printf("Skipping meta for %s: .%s\n", \
411 gn->name, __STRING(_type)); \
412 } \
413 return false; \
414 } \
415 } while (/*CONSTCOND*/false)
416
417
418 /*
419 * Do we need/want a .meta file ?
420 */
421 static bool
meta_needed(GNode * gn,const char * dname,char * objdir_realpath,bool verbose)422 meta_needed(GNode *gn, const char *dname,
423 char *objdir_realpath, bool verbose)
424 {
425 struct cached_stat cst;
426
427 if (verbose)
428 verbose = DEBUG(META);
429
430 /* This may be a phony node which we don't want meta data for... */
431 /* Skip .meta for .BEGIN, .END, .ERROR etc as well. */
432 /* Or it may be explicitly flagged as .NOMETA */
433 SKIP_META_TYPE(NOMETA);
434 /* Unless it is explicitly flagged as .META */
435 if (!(gn->type & OP_META)) {
436 SKIP_META_TYPE(PHONY);
437 SKIP_META_TYPE(SPECIAL);
438 SKIP_META_TYPE(MAKE);
439 }
440
441 /* Check if there are no commands to execute. */
442 if (Lst_IsEmpty(&gn->commands)) {
443 if (verbose)
444 debug_printf("Skipping meta for %s: no commands\n", gn->name);
445 return false;
446 }
447 if ((gn->type & (OP_META|OP_SUBMAKE)) == OP_SUBMAKE) {
448 /* OP_SUBMAKE is a bit too aggressive */
449 if (any_is_submake(gn)) {
450 DEBUG1(META, "Skipping meta for %s: .SUBMAKE\n", gn->name);
451 return false;
452 }
453 }
454
455 /* The object directory may not exist. Check it.. */
456 if (cached_stat(dname, &cst) != 0) {
457 if (verbose)
458 debug_printf("Skipping meta for %s: no .OBJDIR\n", gn->name);
459 return false;
460 }
461
462 /* make sure these are canonical */
463 if (cached_realpath(dname, objdir_realpath) != NULL)
464 dname = objdir_realpath;
465
466 /* If we aren't in the object directory, don't create a meta file. */
467 if (!metaCurdirOk && strcmp(curdir, dname) == 0) {
468 if (verbose)
469 debug_printf("Skipping meta for %s: .OBJDIR == .CURDIR\n",
470 gn->name);
471 return false;
472 }
473 return true;
474 }
475
476
477 static FILE *
meta_create(BuildMon * pbm,GNode * gn)478 meta_create(BuildMon *pbm, GNode *gn)
479 {
480 FILE *fp;
481 char buf[MAXPATHLEN];
482 char objdir_realpath[MAXPATHLEN];
483 char **ptr;
484 FStr dname;
485 const char *tname;
486 char *fname;
487 const char *cp;
488
489 fp = NULL;
490
491 dname = Var_Value(gn, ".OBJDIR");
492 tname = GNode_VarTarget(gn);
493
494 /* if this succeeds objdir_realpath is realpath of dname */
495 if (!meta_needed(gn, dname.str, objdir_realpath, true))
496 goto out;
497 dname.str = objdir_realpath;
498
499 if (metaVerbose) {
500 char *mp;
501
502 /* Describe the target we are building */
503 (void)Var_Subst("${" MAKE_META_PREFIX "}", gn, VARE_WANTRES, &mp);
504 /* TODO: handle errors */
505 if (mp[0] != '\0')
506 fprintf(stdout, "%s\n", mp);
507 free(mp);
508 }
509 /* Get the basename of the target */
510 cp = str_basename(tname);
511
512 fflush(stdout);
513
514 if (!writeMeta)
515 /* Don't create meta data. */
516 goto out;
517
518 fname = meta_name(pbm->meta_fname, sizeof pbm->meta_fname,
519 dname.str, tname, objdir_realpath);
520
521 #ifdef DEBUG_META_MODE
522 DEBUG1(META, "meta_create: %s\n", fname);
523 #endif
524
525 if ((fp = fopen(fname, "w")) == NULL)
526 err(1, "Could not open meta file '%s'", fname);
527
528 fprintf(fp, "# Meta data file %s\n", fname);
529
530 printCMDs(gn, fp);
531
532 fprintf(fp, "CWD %s\n", getcwd(buf, sizeof buf));
533 fprintf(fp, "TARGET %s\n", tname);
534 cp = GNode_VarOodate(gn);
535 if (cp != NULL && *cp != '\0') {
536 fprintf(fp, "OODATE %s\n", cp);
537 }
538 if (metaEnv) {
539 for (ptr = environ; *ptr != NULL; ptr++)
540 fprintf(fp, "ENV %s\n", *ptr);
541 }
542
543 fprintf(fp, "-- command output --\n");
544 fflush(fp);
545
546 Global_Append(".MAKE.META.FILES", fname);
547 Global_Append(".MAKE.META.CREATED", fname);
548
549 gn->type |= OP_META; /* in case anyone wants to know */
550 if (metaSilent) {
551 gn->type |= OP_SILENT;
552 }
553 out:
554 FStr_Done(&dname);
555
556 return fp;
557 }
558
559 static bool
boolValue(char * s)560 boolValue(char *s)
561 {
562 switch(*s) {
563 case '0':
564 case 'N':
565 case 'n':
566 case 'F':
567 case 'f':
568 return false;
569 }
570 return true;
571 }
572
573 /*
574 * Initialization we need before reading makefiles.
575 */
576 void
meta_init(void)577 meta_init(void)
578 {
579 #ifdef USE_FILEMON
580 /* this allows makefiles to test if we have filemon support */
581 Global_Set(".MAKE.PATH_FILEMON", filemon_path());
582 #endif
583 }
584
585
586 #define get_mode_bf(bf, token) \
587 if ((cp = strstr(make_mode, token)) != NULL) \
588 bf = boolValue(cp + sizeof (token) - 1)
589
590 /*
591 * Initialization we need after reading makefiles.
592 */
593 void
meta_mode_init(const char * make_mode)594 meta_mode_init(const char *make_mode)
595 {
596 static bool once = false;
597 char *cp;
598 FStr value;
599
600 useMeta = true;
601 useFilemon = true;
602 writeMeta = true;
603
604 if (make_mode != NULL) {
605 if (strstr(make_mode, "env") != NULL)
606 metaEnv = true;
607 if (strstr(make_mode, "verb") != NULL)
608 metaVerbose = true;
609 if (strstr(make_mode, "read") != NULL)
610 writeMeta = false;
611 if (strstr(make_mode, "nofilemon") != NULL)
612 useFilemon = false;
613 if (strstr(make_mode, "ignore-cmd") != NULL)
614 metaIgnoreCMDs = true;
615 if (useFilemon)
616 get_mode_bf(filemonMissing, "missing-filemon=");
617 get_mode_bf(metaCurdirOk, "curdirok=");
618 get_mode_bf(metaMissing, "missing-meta=");
619 get_mode_bf(metaSilent, "silent=");
620 }
621 if (metaVerbose && !Var_Exists(SCOPE_GLOBAL, MAKE_META_PREFIX)) {
622 /*
623 * The default value for MAKE_META_PREFIX
624 * prints the absolute path of the target.
625 * This works be cause :H will generate '.' if there is no /
626 * and :tA will resolve that to cwd.
627 */
628 Global_Set(MAKE_META_PREFIX,
629 "Building ${.TARGET:H:tA}/${.TARGET:T}");
630 }
631 if (once)
632 return;
633 once = true;
634 memset(&Mybm, 0, sizeof Mybm);
635 /*
636 * We consider ourselves master of all within ${.MAKE.META.BAILIWICK}
637 */
638 (void)Var_Subst("${.MAKE.META.BAILIWICK:O:u:tA}",
639 SCOPE_GLOBAL, VARE_WANTRES, &metaBailiwickStr);
640 /* TODO: handle errors */
641 str2Lst_Append(&metaBailiwick, metaBailiwickStr);
642 /*
643 * We ignore any paths that start with ${.MAKE.META.IGNORE_PATHS}
644 */
645 Global_Append(MAKE_META_IGNORE_PATHS,
646 "/dev /etc /proc /tmp /var/run /var/tmp ${TMPDIR}");
647 (void)Var_Subst("${" MAKE_META_IGNORE_PATHS ":O:u:tA}",
648 SCOPE_GLOBAL, VARE_WANTRES, &metaIgnorePathsStr);
649 /* TODO: handle errors */
650 str2Lst_Append(&metaIgnorePaths, metaIgnorePathsStr);
651
652 /*
653 * We ignore any paths that match ${.MAKE.META.IGNORE_PATTERNS}
654 */
655 value = Var_Value(SCOPE_GLOBAL, MAKE_META_IGNORE_PATTERNS);
656 if (value.str != NULL) {
657 metaIgnorePatterns = true;
658 FStr_Done(&value);
659 }
660 value = Var_Value(SCOPE_GLOBAL, MAKE_META_IGNORE_FILTER);
661 if (value.str != NULL) {
662 metaIgnoreFilter = true;
663 FStr_Done(&value);
664 }
665 }
666
667 /*
668 * In each case below we allow for job==NULL
669 */
670 void
meta_job_start(Job * job,GNode * gn)671 meta_job_start(Job *job, GNode *gn)
672 {
673 BuildMon *pbm;
674
675 if (job != NULL) {
676 pbm = &job->bm;
677 } else {
678 pbm = &Mybm;
679 }
680 pbm->mfp = meta_create(pbm, gn);
681 #ifdef USE_FILEMON_ONCE
682 /* compat mode we open the filemon dev once per command */
683 if (job == NULL)
684 return;
685 #endif
686 #ifdef USE_FILEMON
687 if (pbm->mfp != NULL && useFilemon) {
688 meta_open_filemon(pbm);
689 } else {
690 pbm->mon_fd = -1;
691 pbm->filemon = NULL;
692 }
693 #endif
694 }
695
696 /*
697 * The child calls this before doing anything.
698 * It does not disturb our state.
699 */
700 void
meta_job_child(Job * job)701 meta_job_child(Job *job)
702 {
703 #ifdef USE_FILEMON
704 BuildMon *pbm;
705
706 if (job != NULL) {
707 pbm = &job->bm;
708 } else {
709 pbm = &Mybm;
710 }
711 if (pbm->mfp != NULL) {
712 close(fileno(pbm->mfp));
713 if (useFilemon && pbm->filemon != NULL) {
714 pid_t pid;
715
716 pid = getpid();
717 if (filemon_setpid_child(pbm->filemon, pid) == -1) {
718 err(1, "Could not set filemon pid!");
719 }
720 }
721 }
722 #endif
723 }
724
725 void
meta_job_parent(Job * job,pid_t pid)726 meta_job_parent(Job *job, pid_t pid)
727 {
728 #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV)
729 BuildMon *pbm;
730
731 if (job != NULL) {
732 pbm = &job->bm;
733 } else {
734 pbm = &Mybm;
735 }
736 if (useFilemon && pbm->filemon != NULL) {
737 filemon_setpid_parent(pbm->filemon, pid);
738 }
739 #endif
740 }
741
742 int
meta_job_fd(Job * job)743 meta_job_fd(Job *job)
744 {
745 #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV)
746 BuildMon *pbm;
747
748 if (job != NULL) {
749 pbm = &job->bm;
750 } else {
751 pbm = &Mybm;
752 }
753 if (useFilemon && pbm->filemon != NULL) {
754 return filemon_readfd(pbm->filemon);
755 }
756 #endif
757 return -1;
758 }
759
760 int
meta_job_event(Job * job)761 meta_job_event(Job *job)
762 {
763 #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV)
764 BuildMon *pbm;
765
766 if (job != NULL) {
767 pbm = &job->bm;
768 } else {
769 pbm = &Mybm;
770 }
771 if (useFilemon && pbm->filemon != NULL) {
772 return filemon_process(pbm->filemon);
773 }
774 #endif
775 return 0;
776 }
777
778 void
meta_job_error(Job * job,GNode * gn,bool ignerr,int status)779 meta_job_error(Job *job, GNode *gn, bool ignerr, int status)
780 {
781 char cwd[MAXPATHLEN];
782 BuildMon *pbm;
783
784 if (job != NULL) {
785 pbm = &job->bm;
786 if (gn == NULL)
787 gn = job->node;
788 } else {
789 pbm = &Mybm;
790 }
791 if (pbm->mfp != NULL) {
792 fprintf(pbm->mfp, "\n*** Error code %d%s\n",
793 status, ignerr ? "(ignored)" : "");
794 }
795 if (gn != NULL)
796 Global_Set(".ERROR_TARGET", GNode_Path(gn));
797 getcwd(cwd, sizeof cwd);
798 Global_Set(".ERROR_CWD", cwd);
799 if (pbm->meta_fname[0] != '\0') {
800 Global_Set(".ERROR_META_FILE", pbm->meta_fname);
801 }
802 meta_job_finish(job);
803 }
804
805 void
meta_job_output(Job * job,char * cp,const char * nl)806 meta_job_output(Job *job, char *cp, const char *nl)
807 {
808 BuildMon *pbm;
809
810 if (job != NULL) {
811 pbm = &job->bm;
812 } else {
813 pbm = &Mybm;
814 }
815 if (pbm->mfp != NULL) {
816 if (metaVerbose) {
817 static char *meta_prefix = NULL;
818 static size_t meta_prefix_len;
819
820 if (meta_prefix == NULL) {
821 char *cp2;
822
823 (void)Var_Subst("${" MAKE_META_PREFIX "}",
824 SCOPE_GLOBAL, VARE_WANTRES, &meta_prefix);
825 /* TODO: handle errors */
826 if ((cp2 = strchr(meta_prefix, '$')) != NULL)
827 meta_prefix_len = (size_t)(cp2 - meta_prefix);
828 else
829 meta_prefix_len = strlen(meta_prefix);
830 }
831 if (strncmp(cp, meta_prefix, meta_prefix_len) == 0) {
832 cp = strchr(cp + 1, '\n');
833 if (cp == NULL)
834 return;
835 cp++;
836 }
837 }
838 fprintf(pbm->mfp, "%s%s", cp, nl);
839 }
840 }
841
842 int
meta_cmd_finish(void * pbmp)843 meta_cmd_finish(void *pbmp)
844 {
845 int error = 0;
846 BuildMon *pbm = pbmp;
847 #ifdef USE_FILEMON
848 int x;
849 #endif
850
851 if (pbm == NULL)
852 pbm = &Mybm;
853
854 #ifdef USE_FILEMON
855 if (pbm->filemon != NULL) {
856 while (filemon_process(pbm->filemon) > 0)
857 continue;
858 if (filemon_close(pbm->filemon) == -1)
859 error = errno;
860 x = filemon_read(pbm->mfp, pbm->mon_fd);
861 if (error == 0 && x != 0)
862 error = x;
863 pbm->mon_fd = -1;
864 pbm->filemon = NULL;
865 return error;
866 }
867 #endif
868
869 fprintf(pbm->mfp, "\n"); /* ensure end with newline */
870 return error;
871 }
872
873 int
meta_job_finish(Job * job)874 meta_job_finish(Job *job)
875 {
876 BuildMon *pbm;
877 int error = 0;
878 int x;
879
880 if (job != NULL) {
881 pbm = &job->bm;
882 } else {
883 pbm = &Mybm;
884 }
885 if (pbm->mfp != NULL) {
886 error = meta_cmd_finish(pbm);
887 x = fclose(pbm->mfp);
888 if (error == 0 && x != 0)
889 error = errno;
890 pbm->mfp = NULL;
891 pbm->meta_fname[0] = '\0';
892 }
893 return error;
894 }
895
896 void
meta_finish(void)897 meta_finish(void)
898 {
899 Lst_Done(&metaBailiwick);
900 free(metaBailiwickStr);
901 Lst_Done(&metaIgnorePaths);
902 free(metaIgnorePathsStr);
903 }
904
905 /*
906 * Fetch a full line from fp - growing bufp if needed
907 * Return length in bufp.
908 */
909 static int
fgetLine(char ** bufp,size_t * szp,int o,FILE * fp)910 fgetLine(char **bufp, size_t *szp, int o, FILE *fp)
911 {
912 char *buf = *bufp;
913 size_t bufsz = *szp;
914 struct stat fs;
915 int x;
916
917 if (fgets(&buf[o], (int)bufsz - o, fp) != NULL) {
918 check_newline:
919 x = o + (int)strlen(&buf[o]);
920 if (buf[x - 1] == '\n')
921 return x;
922 /*
923 * We need to grow the buffer.
924 * The meta file can give us a clue.
925 */
926 if (fstat(fileno(fp), &fs) == 0) {
927 size_t newsz;
928 char *p;
929
930 newsz = ROUNDUP(((size_t)fs.st_size / 2), BUFSIZ);
931 if (newsz <= bufsz)
932 newsz = ROUNDUP((size_t)fs.st_size, BUFSIZ);
933 if (newsz <= bufsz)
934 return x; /* truncated */
935 DEBUG2(META, "growing buffer %u -> %u\n",
936 (unsigned)bufsz, (unsigned)newsz);
937 p = bmake_realloc(buf, newsz);
938 *bufp = buf = p;
939 *szp = bufsz = newsz;
940 /* fetch the rest */
941 if (fgets(&buf[x], (int)bufsz - x, fp) == NULL)
942 return x; /* truncated! */
943 goto check_newline;
944 }
945 }
946 return 0;
947 }
948
949 static bool
prefix_match(const char * prefix,const char * path)950 prefix_match(const char *prefix, const char *path)
951 {
952 size_t n = strlen(prefix);
953
954 return strncmp(path, prefix, n) == 0;
955 }
956
957 static bool
has_any_prefix(const char * path,StringList * prefixes)958 has_any_prefix(const char *path, StringList *prefixes)
959 {
960 StringListNode *ln;
961
962 for (ln = prefixes->first; ln != NULL; ln = ln->next)
963 if (prefix_match(ln->datum, path))
964 return true;
965 return false;
966 }
967
968 /* See if the path equals prefix or starts with "prefix/". */
969 static bool
path_starts_with(const char * path,const char * prefix)970 path_starts_with(const char *path, const char *prefix)
971 {
972 size_t n = strlen(prefix);
973
974 if (strncmp(path, prefix, n) != 0)
975 return false;
976 return path[n] == '\0' || path[n] == '/';
977 }
978
979 static bool
meta_ignore(GNode * gn,const char * p)980 meta_ignore(GNode *gn, const char *p)
981 {
982 char fname[MAXPATHLEN];
983
984 if (p == NULL)
985 return true;
986
987 if (*p == '/') {
988 cached_realpath(p, fname); /* clean it up */
989 if (has_any_prefix(fname, &metaIgnorePaths)) {
990 #ifdef DEBUG_META_MODE
991 DEBUG1(META, "meta_oodate: ignoring path: %s\n", p);
992 #endif
993 return true;
994 }
995 }
996
997 if (metaIgnorePatterns) {
998 const char *expr;
999 char *pm;
1000
1001 /*
1002 * XXX: This variable is set on a target GNode but is not one of
1003 * the usual local variables. It should be deleted afterwards.
1004 * Ideally it would not be created in the first place, just like
1005 * in a .for loop.
1006 */
1007 Var_Set(gn, ".p.", p);
1008 expr = "${" MAKE_META_IGNORE_PATTERNS ":@m@${.p.:M$m}@}";
1009 (void)Var_Subst(expr, gn, VARE_WANTRES, &pm);
1010 /* TODO: handle errors */
1011 if (pm[0] != '\0') {
1012 #ifdef DEBUG_META_MODE
1013 DEBUG1(META, "meta_oodate: ignoring pattern: %s\n", p);
1014 #endif
1015 free(pm);
1016 return true;
1017 }
1018 free(pm);
1019 }
1020
1021 if (metaIgnoreFilter) {
1022 char *fm;
1023
1024 /* skip if filter result is empty */
1025 snprintf(fname, sizeof fname,
1026 "${%s:L:${%s:ts:}}",
1027 p, MAKE_META_IGNORE_FILTER);
1028 (void)Var_Subst(fname, gn, VARE_WANTRES, &fm);
1029 /* TODO: handle errors */
1030 if (*fm == '\0') {
1031 #ifdef DEBUG_META_MODE
1032 DEBUG1(META, "meta_oodate: ignoring filtered: %s\n", p);
1033 #endif
1034 free(fm);
1035 return true;
1036 }
1037 free(fm);
1038 }
1039 return false;
1040 }
1041
1042 /*
1043 * When running with 'meta' functionality, a target can be out-of-date
1044 * if any of the references in its meta data file is more recent.
1045 * We have to track the latestdir on a per-process basis.
1046 */
1047 #define LCWD_VNAME_FMT ".meta.%d.lcwd"
1048 #define LDIR_VNAME_FMT ".meta.%d.ldir"
1049
1050 /*
1051 * It is possible that a .meta file is corrupted,
1052 * if we detect this we want to reproduce it.
1053 * Setting oodate true will have that effect.
1054 */
1055 #define CHECK_VALID_META(p) if (!(p != NULL && *p != '\0')) { \
1056 warnx("%s: %d: malformed", fname, lineno); \
1057 oodate = true; \
1058 continue; \
1059 }
1060
1061 #define DEQUOTE(p) if (*p == '\'') { \
1062 char *ep; \
1063 p++; \
1064 if ((ep = strchr(p, '\'')) != NULL) \
1065 *ep = '\0'; \
1066 }
1067
1068 static void
append_if_new(StringList * list,const char * str)1069 append_if_new(StringList *list, const char *str)
1070 {
1071 StringListNode *ln;
1072
1073 for (ln = list->first; ln != NULL; ln = ln->next)
1074 if (strcmp(ln->datum, str) == 0)
1075 return;
1076 Lst_Append(list, bmake_strdup(str));
1077 }
1078
1079 bool
meta_oodate(GNode * gn,bool oodate)1080 meta_oodate(GNode *gn, bool oodate)
1081 {
1082 static char *tmpdir = NULL;
1083 static char cwd[MAXPATHLEN];
1084 char lcwd_vname[64];
1085 char ldir_vname[64];
1086 char lcwd[MAXPATHLEN];
1087 char latestdir[MAXPATHLEN];
1088 char fname[MAXPATHLEN];
1089 char fname1[MAXPATHLEN];
1090 char fname2[MAXPATHLEN];
1091 char fname3[MAXPATHLEN];
1092 FStr dname;
1093 const char *tname;
1094 char *p;
1095 char *link_src;
1096 char *move_target;
1097 static size_t cwdlen = 0;
1098 static size_t tmplen = 0;
1099 FILE *fp;
1100 bool needOODATE = false;
1101 StringList missingFiles;
1102 bool have_filemon = false;
1103
1104 if (oodate)
1105 return oodate; /* we're done */
1106
1107 dname = Var_Value(gn, ".OBJDIR");
1108 tname = GNode_VarTarget(gn);
1109
1110 /* if this succeeds fname3 is realpath of dname */
1111 if (!meta_needed(gn, dname.str, fname3, false))
1112 goto oodate_out;
1113 dname.str = fname3;
1114
1115 Lst_Init(&missingFiles);
1116
1117 /*
1118 * We need to check if the target is out-of-date. This includes
1119 * checking if the expanded command has changed. This in turn
1120 * requires that all variables are set in the same way that they
1121 * would be if the target needs to be re-built.
1122 */
1123 GNode_SetLocalVars(gn);
1124
1125 meta_name(fname, sizeof fname, dname.str, tname, dname.str);
1126
1127 #ifdef DEBUG_META_MODE
1128 DEBUG1(META, "meta_oodate: %s\n", fname);
1129 #endif
1130
1131 if ((fp = fopen(fname, "r")) != NULL) {
1132 static char *buf = NULL;
1133 static size_t bufsz;
1134 int lineno = 0;
1135 int lastpid = 0;
1136 int pid;
1137 int x;
1138 StringListNode *cmdNode;
1139 struct cached_stat cst;
1140
1141 if (buf == NULL) {
1142 bufsz = 8 * BUFSIZ;
1143 buf = bmake_malloc(bufsz);
1144 }
1145
1146 if (cwdlen == 0) {
1147 if (getcwd(cwd, sizeof cwd) == NULL)
1148 err(1, "Could not get current working directory");
1149 cwdlen = strlen(cwd);
1150 }
1151 strlcpy(lcwd, cwd, sizeof lcwd);
1152 strlcpy(latestdir, cwd, sizeof latestdir);
1153
1154 if (tmpdir == NULL) {
1155 tmpdir = getTmpdir();
1156 tmplen = strlen(tmpdir);
1157 }
1158
1159 /* we want to track all the .meta we read */
1160 Global_Append(".MAKE.META.FILES", fname);
1161
1162 cmdNode = gn->commands.first;
1163 while (!oodate && (x = fgetLine(&buf, &bufsz, 0, fp)) > 0) {
1164 lineno++;
1165 if (buf[x - 1] == '\n')
1166 buf[x - 1] = '\0';
1167 else {
1168 warnx("%s: %d: line truncated at %u", fname, lineno, x);
1169 oodate = true;
1170 break;
1171 }
1172 link_src = NULL;
1173 move_target = NULL;
1174 /* Find the start of the build monitor section. */
1175 if (!have_filemon) {
1176 if (strncmp(buf, "-- filemon", 10) == 0) {
1177 have_filemon = true;
1178 continue;
1179 }
1180 if (strncmp(buf, "# buildmon", 10) == 0) {
1181 have_filemon = true;
1182 continue;
1183 }
1184 }
1185
1186 /* Delimit the record type. */
1187 p = buf;
1188 #ifdef DEBUG_META_MODE
1189 DEBUG3(META, "%s: %d: %s\n", fname, lineno, buf);
1190 #endif
1191 strsep(&p, " ");
1192 if (have_filemon) {
1193 /*
1194 * We are in the 'filemon' output section.
1195 * Each record from filemon follows the general form:
1196 *
1197 * <key> <pid> <data>
1198 *
1199 * Where:
1200 * <key> is a single letter, denoting the syscall.
1201 * <pid> is the process that made the syscall.
1202 * <data> is the arguments (of interest).
1203 */
1204 switch(buf[0]) {
1205 case '#': /* comment */
1206 case 'V': /* version */
1207 break;
1208 default:
1209 /*
1210 * We need to track pathnames per-process.
1211 *
1212 * Each process run by make starts off in the 'CWD'
1213 * recorded in the .meta file, if it chdirs ('C')
1214 * elsewhere we need to track that - but only for
1215 * that process. If it forks ('F'), we initialize
1216 * the child to have the same cwd as its parent.
1217 *
1218 * We also need to track the 'latestdir' of
1219 * interest. This is usually the same as cwd, but
1220 * not if a process is reading directories.
1221 *
1222 * Each time we spot a different process ('pid')
1223 * we save the current value of 'latestdir' in a
1224 * variable qualified by 'lastpid', and
1225 * re-initialize 'latestdir' to any pre-saved
1226 * value for the current 'pid' and 'CWD' if none.
1227 */
1228 CHECK_VALID_META(p);
1229 pid = atoi(p);
1230 if (pid > 0 && pid != lastpid) {
1231 FStr ldir;
1232
1233 if (lastpid > 0) {
1234 /* We need to remember these. */
1235 Global_SetExpand(lcwd_vname, lcwd);
1236 Global_SetExpand(ldir_vname, latestdir);
1237 }
1238 snprintf(lcwd_vname, sizeof lcwd_vname, LCWD_VNAME_FMT, pid);
1239 snprintf(ldir_vname, sizeof ldir_vname, LDIR_VNAME_FMT, pid);
1240 lastpid = pid;
1241 ldir = Var_Value(SCOPE_GLOBAL, ldir_vname);
1242 if (ldir.str != NULL) {
1243 strlcpy(latestdir, ldir.str, sizeof latestdir);
1244 FStr_Done(&ldir);
1245 }
1246 ldir = Var_Value(SCOPE_GLOBAL, lcwd_vname);
1247 if (ldir.str != NULL) {
1248 strlcpy(lcwd, ldir.str, sizeof lcwd);
1249 FStr_Done(&ldir);
1250 }
1251 }
1252 /* Skip past the pid. */
1253 if (strsep(&p, " ") == NULL)
1254 continue;
1255 #ifdef DEBUG_META_MODE
1256 if (DEBUG(META))
1257 debug_printf("%s: %d: %d: %c: cwd=%s lcwd=%s ldir=%s\n",
1258 fname, lineno,
1259 pid, buf[0], cwd, lcwd, latestdir);
1260 #endif
1261 break;
1262 }
1263
1264 CHECK_VALID_META(p);
1265
1266 /* Process according to record type. */
1267 switch (buf[0]) {
1268 case 'X': /* eXit */
1269 Var_DeleteExpand(SCOPE_GLOBAL, lcwd_vname);
1270 Var_DeleteExpand(SCOPE_GLOBAL, ldir_vname);
1271 lastpid = 0; /* no need to save ldir_vname */
1272 break;
1273
1274 case 'F': /* [v]Fork */
1275 {
1276 char cldir[64];
1277 int child;
1278
1279 child = atoi(p);
1280 if (child > 0) {
1281 snprintf(cldir, sizeof cldir, LCWD_VNAME_FMT, child);
1282 Global_SetExpand(cldir, lcwd);
1283 snprintf(cldir, sizeof cldir, LDIR_VNAME_FMT, child);
1284 Global_SetExpand(cldir, latestdir);
1285 #ifdef DEBUG_META_MODE
1286 if (DEBUG(META))
1287 debug_printf(
1288 "%s: %d: %d: cwd=%s lcwd=%s ldir=%s\n",
1289 fname, lineno,
1290 child, cwd, lcwd, latestdir);
1291 #endif
1292 }
1293 }
1294 break;
1295
1296 case 'C': /* Chdir */
1297 /* Update lcwd and latest directory. */
1298 strlcpy(latestdir, p, sizeof latestdir);
1299 strlcpy(lcwd, p, sizeof lcwd);
1300 Global_SetExpand(lcwd_vname, lcwd);
1301 Global_SetExpand(ldir_vname, lcwd);
1302 #ifdef DEBUG_META_MODE
1303 DEBUG4(META, "%s: %d: cwd=%s ldir=%s\n",
1304 fname, lineno, cwd, lcwd);
1305 #endif
1306 break;
1307
1308 case 'M': /* renaMe */
1309 /*
1310 * For 'M'oves we want to check
1311 * the src as for 'R'ead
1312 * and the target as for 'W'rite.
1313 */
1314 {
1315 char *cp = p; /* save this for a second */
1316 /* now get target */
1317 if (strsep(&p, " ") == NULL)
1318 continue;
1319 CHECK_VALID_META(p);
1320 move_target = p;
1321 p = cp;
1322 }
1323 /* 'L' and 'M' put single quotes around the args */
1324 DEQUOTE(p);
1325 DEQUOTE(move_target);
1326 /* FALLTHROUGH */
1327 case 'D': /* unlink */
1328 if (*p == '/') {
1329 /* remove any missingFiles entries that match p */
1330 StringListNode *ln = missingFiles.first;
1331 while (ln != NULL) {
1332 StringListNode *next = ln->next;
1333 if (path_starts_with(ln->datum, p)) {
1334 free(ln->datum);
1335 Lst_Remove(&missingFiles, ln);
1336 }
1337 ln = next;
1338 }
1339 }
1340 if (buf[0] == 'M') {
1341 /* the target of the mv is a file 'W'ritten */
1342 #ifdef DEBUG_META_MODE
1343 DEBUG2(META, "meta_oodate: M %s -> %s\n",
1344 p, move_target);
1345 #endif
1346 p = move_target;
1347 goto check_write;
1348 }
1349 break;
1350 case 'L': /* Link */
1351 /*
1352 * For 'L'inks check
1353 * the src as for 'R'ead
1354 * and the target as for 'W'rite.
1355 */
1356 link_src = p;
1357 /* now get target */
1358 if (strsep(&p, " ") == NULL)
1359 continue;
1360 CHECK_VALID_META(p);
1361 /* 'L' and 'M' put single quotes around the args */
1362 DEQUOTE(p);
1363 DEQUOTE(link_src);
1364 #ifdef DEBUG_META_MODE
1365 DEBUG2(META, "meta_oodate: L %s -> %s\n", link_src, p);
1366 #endif
1367 /* FALLTHROUGH */
1368 case 'W': /* Write */
1369 check_write:
1370 /*
1371 * If a file we generated within our bailiwick
1372 * but outside of .OBJDIR is missing,
1373 * we need to do it again.
1374 */
1375 /* ignore non-absolute paths */
1376 if (*p != '/')
1377 break;
1378
1379 if (Lst_IsEmpty(&metaBailiwick))
1380 break;
1381
1382 /* ignore cwd - normal dependencies handle those */
1383 if (strncmp(p, cwd, cwdlen) == 0)
1384 break;
1385
1386 if (!has_any_prefix(p, &metaBailiwick))
1387 break;
1388
1389 /* tmpdir might be within */
1390 if (tmplen > 0 && strncmp(p, tmpdir, tmplen) == 0)
1391 break;
1392
1393 /* ignore anything containing the string "tmp" */
1394 /* XXX: The arguments to strstr must be swapped. */
1395 if (strstr("tmp", p) != NULL)
1396 break;
1397
1398 if ((link_src != NULL && cached_lstat(p, &cst) < 0) ||
1399 (link_src == NULL && cached_stat(p, &cst) < 0)) {
1400 if (!meta_ignore(gn, p))
1401 append_if_new(&missingFiles, p);
1402 }
1403 break;
1404 check_link_src:
1405 p = link_src;
1406 link_src = NULL;
1407 #ifdef DEBUG_META_MODE
1408 DEBUG1(META, "meta_oodate: L src %s\n", p);
1409 #endif
1410 /* FALLTHROUGH */
1411 case 'R': /* Read */
1412 case 'E': /* Exec */
1413 /*
1414 * Check for runtime files that can't
1415 * be part of the dependencies because
1416 * they are _expected_ to change.
1417 */
1418 if (meta_ignore(gn, p))
1419 break;
1420
1421 /*
1422 * The rest of the record is the file name.
1423 * Check if it's not an absolute path.
1424 */
1425 {
1426 char *sdirs[4];
1427 char **sdp;
1428 int sdx = 0;
1429 bool found = false;
1430
1431 if (*p == '/') {
1432 sdirs[sdx++] = p; /* done */
1433 } else {
1434 if (strcmp(".", p) == 0)
1435 continue; /* no point */
1436
1437 /* Check vs latestdir */
1438 snprintf(fname1, sizeof fname1, "%s/%s", latestdir, p);
1439 sdirs[sdx++] = fname1;
1440
1441 if (strcmp(latestdir, lcwd) != 0) {
1442 /* Check vs lcwd */
1443 snprintf(fname2, sizeof fname2, "%s/%s", lcwd, p);
1444 sdirs[sdx++] = fname2;
1445 }
1446 if (strcmp(lcwd, cwd) != 0) {
1447 /* Check vs cwd */
1448 snprintf(fname3, sizeof fname3, "%s/%s", cwd, p);
1449 sdirs[sdx++] = fname3;
1450 }
1451 }
1452 sdirs[sdx++] = NULL;
1453
1454 for (sdp = sdirs; *sdp != NULL && !found; sdp++) {
1455 #ifdef DEBUG_META_MODE
1456 DEBUG3(META, "%s: %d: looking for: %s\n",
1457 fname, lineno, *sdp);
1458 #endif
1459 if (cached_stat(*sdp, &cst) == 0) {
1460 found = true;
1461 p = *sdp;
1462 }
1463 }
1464 if (found) {
1465 #ifdef DEBUG_META_MODE
1466 DEBUG3(META, "%s: %d: found: %s\n",
1467 fname, lineno, p);
1468 #endif
1469 if (!S_ISDIR(cst.cst_mode) &&
1470 cst.cst_mtime > gn->mtime) {
1471 DEBUG3(META, "%s: %d: file '%s' is newer than the target...\n",
1472 fname, lineno, p);
1473 oodate = true;
1474 } else if (S_ISDIR(cst.cst_mode)) {
1475 /* Update the latest directory. */
1476 cached_realpath(p, latestdir);
1477 }
1478 } else if (errno == ENOENT && *p == '/' &&
1479 strncmp(p, cwd, cwdlen) != 0) {
1480 /*
1481 * A referenced file outside of CWD is missing.
1482 * We cannot catch every eventuality here...
1483 */
1484 append_if_new(&missingFiles, p);
1485 }
1486 }
1487 if (buf[0] == 'E') {
1488 /* previous latestdir is no longer relevant */
1489 strlcpy(latestdir, lcwd, sizeof latestdir);
1490 }
1491 break;
1492 default:
1493 break;
1494 }
1495 if (!oodate && buf[0] == 'L' && link_src != NULL)
1496 goto check_link_src;
1497 } else if (strcmp(buf, "CMD") == 0) {
1498 /*
1499 * Compare the current command with the one in the
1500 * meta data file.
1501 */
1502 if (cmdNode == NULL) {
1503 DEBUG2(META, "%s: %d: there were more build commands in the meta data file than there are now...\n",
1504 fname, lineno);
1505 oodate = true;
1506 } else {
1507 const char *cp;
1508 char *cmd = cmdNode->datum;
1509 bool hasOODATE = false;
1510
1511 if (strstr(cmd, "$?") != NULL)
1512 hasOODATE = true;
1513 else if ((cp = strstr(cmd, ".OODATE")) != NULL) {
1514 /* check for $[{(].OODATE[:)}] */
1515 if (cp > cmd + 2 && cp[-2] == '$')
1516 hasOODATE = true;
1517 }
1518 if (hasOODATE) {
1519 needOODATE = true;
1520 DEBUG2(META, "%s: %d: cannot compare command using .OODATE\n",
1521 fname, lineno);
1522 }
1523 (void)Var_Subst(cmd, gn, VARE_UNDEFERR, &cmd);
1524 /* TODO: handle errors */
1525
1526 if ((cp = strchr(cmd, '\n')) != NULL) {
1527 int n;
1528
1529 /*
1530 * This command contains newlines, we need to
1531 * fetch more from the .meta file before we
1532 * attempt a comparison.
1533 */
1534 /* first put the newline back at buf[x - 1] */
1535 buf[x - 1] = '\n';
1536 do {
1537 /* now fetch the next line */
1538 if ((n = fgetLine(&buf, &bufsz, x, fp)) <= 0)
1539 break;
1540 x = n;
1541 lineno++;
1542 if (buf[x - 1] != '\n') {
1543 warnx("%s: %d: line truncated at %u", fname, lineno, x);
1544 break;
1545 }
1546 cp = strchr(cp + 1, '\n');
1547 } while (cp != NULL);
1548 if (buf[x - 1] == '\n')
1549 buf[x - 1] = '\0';
1550 }
1551 if (p != NULL &&
1552 !hasOODATE &&
1553 !(gn->type & OP_NOMETA_CMP) &&
1554 (strcmp(p, cmd) != 0)) {
1555 DEBUG4(META, "%s: %d: a build command has changed\n%s\nvs\n%s\n",
1556 fname, lineno, p, cmd);
1557 if (!metaIgnoreCMDs)
1558 oodate = true;
1559 }
1560 free(cmd);
1561 cmdNode = cmdNode->next;
1562 }
1563 } else if (strcmp(buf, "CWD") == 0) {
1564 /*
1565 * Check if there are extra commands now
1566 * that weren't in the meta data file.
1567 */
1568 if (!oodate && cmdNode != NULL) {
1569 DEBUG2(META, "%s: %d: there are extra build commands now that weren't in the meta data file\n",
1570 fname, lineno);
1571 oodate = true;
1572 }
1573 CHECK_VALID_META(p);
1574 if (strcmp(p, cwd) != 0) {
1575 DEBUG4(META, "%s: %d: the current working directory has changed from '%s' to '%s'\n",
1576 fname, lineno, p, curdir);
1577 oodate = true;
1578 }
1579 }
1580 }
1581
1582 fclose(fp);
1583 if (!Lst_IsEmpty(&missingFiles)) {
1584 DEBUG2(META, "%s: missing files: %s...\n",
1585 fname, (char *)missingFiles.first->datum);
1586 oodate = true;
1587 }
1588 if (!oodate && !have_filemon && filemonMissing) {
1589 DEBUG1(META, "%s: missing filemon data\n", fname);
1590 oodate = true;
1591 }
1592 } else {
1593 if (writeMeta && (metaMissing || (gn->type & OP_META))) {
1594 const char *cp = NULL;
1595
1596 /* if target is in .CURDIR we do not need a meta file */
1597 if (gn->path != NULL && (cp = strrchr(gn->path, '/')) != NULL &&
1598 (cp > gn->path)) {
1599 if (strncmp(curdir, gn->path, (size_t)(cp - gn->path)) != 0) {
1600 cp = NULL; /* not in .CURDIR */
1601 }
1602 }
1603 if (cp == NULL) {
1604 DEBUG1(META, "%s: required but missing\n", fname);
1605 oodate = true;
1606 needOODATE = true; /* assume the worst */
1607 }
1608 }
1609 }
1610
1611 Lst_DoneCall(&missingFiles, free);
1612
1613 if (oodate && needOODATE) {
1614 /*
1615 * Target uses .OODATE which is empty; or we wouldn't be here.
1616 * We have decided it is oodate, so .OODATE needs to be set.
1617 * All we can sanely do is set it to .ALLSRC.
1618 */
1619 Var_Delete(gn, OODATE);
1620 Var_Set(gn, OODATE, GNode_VarAllsrc(gn));
1621 }
1622
1623 oodate_out:
1624 FStr_Done(&dname);
1625 return oodate;
1626 }
1627
1628 /* support for compat mode */
1629
1630 static int childPipe[2];
1631
1632 void
meta_compat_start(void)1633 meta_compat_start(void)
1634 {
1635 #ifdef USE_FILEMON_ONCE
1636 /*
1637 * We need to re-open filemon for each cmd.
1638 */
1639 BuildMon *pbm = &Mybm;
1640
1641 if (pbm->mfp != NULL && useFilemon) {
1642 meta_open_filemon(pbm);
1643 } else {
1644 pbm->mon_fd = -1;
1645 pbm->filemon = NULL;
1646 }
1647 #endif
1648 if (pipe(childPipe) < 0)
1649 Punt("Cannot create pipe: %s", strerror(errno));
1650 /* Set close-on-exec flag for both */
1651 (void)fcntl(childPipe[0], F_SETFD, FD_CLOEXEC);
1652 (void)fcntl(childPipe[1], F_SETFD, FD_CLOEXEC);
1653 }
1654
1655 void
meta_compat_child(void)1656 meta_compat_child(void)
1657 {
1658 meta_job_child(NULL);
1659 if (dup2(childPipe[1], 1) < 0 || dup2(1, 2) < 0)
1660 execDie("dup2", "pipe");
1661 }
1662
1663 void
meta_compat_parent(pid_t child)1664 meta_compat_parent(pid_t child)
1665 {
1666 int outfd, metafd, maxfd, nfds;
1667 char buf[BUFSIZ+1];
1668 fd_set readfds;
1669
1670 meta_job_parent(NULL, child);
1671 close(childPipe[1]); /* child side */
1672 outfd = childPipe[0];
1673 #ifdef USE_FILEMON
1674 metafd = Mybm.filemon != NULL ? filemon_readfd(Mybm.filemon) : -1;
1675 #else
1676 metafd = -1;
1677 #endif
1678 maxfd = -1;
1679 if (outfd > maxfd)
1680 maxfd = outfd;
1681 if (metafd > maxfd)
1682 maxfd = metafd;
1683
1684 while (outfd != -1 || metafd != -1) {
1685 FD_ZERO(&readfds);
1686 if (outfd != -1) {
1687 FD_SET(outfd, &readfds);
1688 }
1689 if (metafd != -1) {
1690 FD_SET(metafd, &readfds);
1691 }
1692 nfds = select(maxfd + 1, &readfds, NULL, NULL, NULL);
1693 if (nfds == -1) {
1694 if (errno == EINTR)
1695 continue;
1696 err(1, "select");
1697 }
1698
1699 if (outfd != -1 && FD_ISSET(outfd, &readfds) != 0) do {
1700 /* XXX this is not line-buffered */
1701 ssize_t nread = read(outfd, buf, sizeof buf - 1);
1702 if (nread == -1)
1703 err(1, "read");
1704 if (nread == 0) {
1705 close(outfd);
1706 outfd = -1;
1707 break;
1708 }
1709 fwrite(buf, 1, (size_t)nread, stdout);
1710 fflush(stdout);
1711 buf[nread] = '\0';
1712 meta_job_output(NULL, buf, "");
1713 } while (/*CONSTCOND*/false);
1714 if (metafd != -1 && FD_ISSET(metafd, &readfds) != 0) {
1715 if (meta_job_event(NULL) <= 0)
1716 metafd = -1;
1717 }
1718 }
1719 }
1720
1721 #endif /* USE_META */
1722