1 /* $NetBSD: meta.c,v 1.70 2018/02/13 19:37:30 sjg Exp $ */
2
3 /*
4 * Implement 'meta' mode.
5 * Adapted from John Birrell's patches to FreeBSD make.
6 * --sjg
7 */
8 /*
9 * Copyright (c) 2009-2016, Juniper Networks, Inc.
10 * Portions Copyright (c) 2009, John Birrell.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33 #if defined(USE_META)
34
35 #ifdef HAVE_CONFIG_H
36 # include "config.h"
37 #endif
38 #include <sys/stat.h>
39 #include <sys/ioctl.h>
40 #ifdef HAVE_LIBGEN_H
41 #include <libgen.h>
42 #elif !defined(HAVE_DIRNAME)
43 char * dirname(char *);
44 #endif
45 #include <errno.h>
46 #if !defined(HAVE_CONFIG_H) || defined(HAVE_ERR_H)
47 #include <err.h>
48 #endif
49
50 #include "make.h"
51 #include "job.h"
52
53 #ifdef HAVE_FILEMON_H
54 # include <filemon.h>
55 #endif
56 #if !defined(USE_FILEMON) && defined(FILEMON_SET_FD)
57 # define USE_FILEMON
58 #endif
59
60 static BuildMon Mybm; /* for compat */
61 static Lst metaBailiwick; /* our scope of control */
62 static char *metaBailiwickStr; /* string storage for the list */
63 static Lst metaIgnorePaths; /* paths we deliberately ignore */
64 static char *metaIgnorePathsStr; /* string storage for the list */
65
66 #ifndef MAKE_META_IGNORE_PATHS
67 #define MAKE_META_IGNORE_PATHS ".MAKE.META.IGNORE_PATHS"
68 #endif
69 #ifndef MAKE_META_IGNORE_PATTERNS
70 #define MAKE_META_IGNORE_PATTERNS ".MAKE.META.IGNORE_PATTERNS"
71 #endif
72 #ifndef MAKE_META_IGNORE_FILTER
73 #define MAKE_META_IGNORE_FILTER ".MAKE.META.IGNORE_FILTER"
74 #endif
75
76 Boolean useMeta = FALSE;
77 static Boolean useFilemon = FALSE;
78 static Boolean writeMeta = FALSE;
79 static Boolean metaMissing = FALSE; /* oodate if missing */
80 static Boolean filemonMissing = FALSE; /* oodate if missing */
81 static Boolean metaEnv = FALSE; /* don't save env unless asked */
82 static Boolean metaVerbose = FALSE;
83 static Boolean metaIgnoreCMDs = FALSE; /* ignore CMDs in .meta files */
84 static Boolean metaIgnorePatterns = FALSE; /* do we need to do pattern matches */
85 static Boolean metaIgnoreFilter = FALSE; /* do we have more complex filtering? */
86 static Boolean metaCurdirOk = FALSE; /* write .meta in .CURDIR Ok? */
87 static Boolean metaSilent = FALSE; /* if we have a .meta be SILENT */
88
89 extern Boolean forceJobs;
90 extern Boolean comatMake;
91 extern char **environ;
92
93 #define MAKE_META_PREFIX ".MAKE.META.PREFIX"
94
95 #ifndef N2U
96 # define N2U(n, u) (((n) + ((u) - 1)) / (u))
97 #endif
98 #ifndef ROUNDUP
99 # define ROUNDUP(n, u) (N2U((n), (u)) * (u))
100 #endif
101
102 #if !defined(HAVE_STRSEP)
103 # define strsep(s, d) stresep((s), (d), 0)
104 #endif
105
106 /*
107 * Filemon is a kernel module which snoops certain syscalls.
108 *
109 * C chdir
110 * E exec
111 * F [v]fork
112 * L [sym]link
113 * M rename
114 * R read
115 * W write
116 * S stat
117 *
118 * See meta_oodate below - we mainly care about 'E' and 'R'.
119 *
120 * We can still use meta mode without filemon, but
121 * the benefits are more limited.
122 */
123 #ifdef USE_FILEMON
124 # ifndef _PATH_FILEMON
125 # define _PATH_FILEMON "/dev/filemon"
126 # endif
127
128 /*
129 * Open the filemon device.
130 */
131 static void
filemon_open(BuildMon * pbm)132 filemon_open(BuildMon *pbm)
133 {
134 int retry;
135
136 pbm->mon_fd = pbm->filemon_fd = -1;
137 if (!useFilemon)
138 return;
139
140 for (retry = 5; retry >= 0; retry--) {
141 if ((pbm->filemon_fd = open(_PATH_FILEMON, O_RDWR)) >= 0)
142 break;
143 }
144
145 if (pbm->filemon_fd < 0) {
146 useFilemon = FALSE;
147 warn("Could not open %s", _PATH_FILEMON);
148 return;
149 }
150
151 /*
152 * We use a file outside of '.'
153 * to avoid a FreeBSD kernel bug where unlink invalidates
154 * cwd causing getcwd to do a lot more work.
155 * We only care about the descriptor.
156 */
157 pbm->mon_fd = mkTempFile("filemon.XXXXXX", NULL);
158 if (ioctl(pbm->filemon_fd, FILEMON_SET_FD, &pbm->mon_fd) < 0) {
159 err(1, "Could not set filemon file descriptor!");
160 }
161 /* we don't need these once we exec */
162 (void)fcntl(pbm->mon_fd, F_SETFD, FD_CLOEXEC);
163 (void)fcntl(pbm->filemon_fd, F_SETFD, FD_CLOEXEC);
164 }
165
166 /*
167 * Read the build monitor output file and write records to the target's
168 * metadata file.
169 */
170 static int
filemon_read(FILE * mfp,int fd)171 filemon_read(FILE *mfp, int fd)
172 {
173 char buf[BUFSIZ];
174 int n;
175 int error;
176
177 /* Check if we're not writing to a meta data file.*/
178 if (mfp == NULL) {
179 if (fd >= 0)
180 close(fd); /* not interested */
181 return 0;
182 }
183 /* rewind */
184 (void)lseek(fd, (off_t)0, SEEK_SET);
185
186 error = 0;
187 fprintf(mfp, "\n-- filemon acquired metadata --\n");
188
189 while ((n = read(fd, buf, sizeof(buf))) > 0) {
190 if ((int)fwrite(buf, 1, n, mfp) < n)
191 error = EIO;
192 }
193 fflush(mfp);
194 if (close(fd) < 0)
195 error = errno;
196 return error;
197 }
198 #endif
199
200 /*
201 * when realpath() fails,
202 * we use this, to clean up ./ and ../
203 */
204 static void
eat_dots(char * buf,size_t bufsz,int dots)205 eat_dots(char *buf, size_t bufsz, int dots)
206 {
207 char *cp;
208 char *cp2;
209 const char *eat;
210 size_t eatlen;
211
212 switch (dots) {
213 case 1:
214 eat = "/./";
215 eatlen = 2;
216 break;
217 case 2:
218 eat = "/../";
219 eatlen = 3;
220 break;
221 default:
222 return;
223 }
224
225 do {
226 cp = strstr(buf, eat);
227 if (cp) {
228 cp2 = cp + eatlen;
229 if (dots == 2 && cp > buf) {
230 do {
231 cp--;
232 } while (cp > buf && *cp != '/');
233 }
234 if (*cp == '/') {
235 strlcpy(cp, cp2, bufsz - (cp - buf));
236 } else {
237 return; /* can't happen? */
238 }
239 }
240 } while (cp);
241 }
242
243 static char *
meta_name(char * mname,size_t mnamelen,const char * dname,const char * tname,const char * cwd)244 meta_name(char *mname, size_t mnamelen,
245 const char *dname,
246 const char *tname,
247 const char *cwd)
248 {
249 char buf[MAXPATHLEN];
250 char *rp;
251 char *cp;
252 char *tp;
253 char *dtp;
254 size_t ldname;
255
256 /*
257 * Weed out relative paths from the target file name.
258 * We have to be careful though since if target is a
259 * symlink, the result will be unstable.
260 * So we use realpath() just to get the dirname, and leave the
261 * basename as given to us.
262 */
263 if ((cp = strrchr(tname, '/'))) {
264 if (cached_realpath(tname, buf)) {
265 if ((rp = strrchr(buf, '/'))) {
266 rp++;
267 cp++;
268 if (strcmp(cp, rp) != 0)
269 strlcpy(rp, cp, sizeof(buf) - (rp - buf));
270 }
271 tname = buf;
272 } else {
273 /*
274 * We likely have a directory which is about to be made.
275 * We pretend realpath() succeeded, to have a chance
276 * of generating the same meta file name that we will
277 * next time through.
278 */
279 if (tname[0] == '/') {
280 strlcpy(buf, tname, sizeof(buf));
281 } else {
282 snprintf(buf, sizeof(buf), "%s/%s", cwd, tname);
283 }
284 eat_dots(buf, sizeof(buf), 1); /* ./ */
285 eat_dots(buf, sizeof(buf), 2); /* ../ */
286 tname = buf;
287 }
288 }
289 /* on some systems dirname may modify its arg */
290 tp = bmake_strdup(tname);
291 dtp = dirname(tp);
292 if (strcmp(dname, dtp) == 0)
293 snprintf(mname, mnamelen, "%s.meta", tname);
294 else {
295 ldname = strlen(dname);
296 if (strncmp(dname, dtp, ldname) == 0 && dtp[ldname] == '/')
297 snprintf(mname, mnamelen, "%s/%s.meta", dname, &tname[ldname+1]);
298 else
299 snprintf(mname, mnamelen, "%s/%s.meta", dname, tname);
300
301 /*
302 * Replace path separators in the file name after the
303 * current object directory path.
304 */
305 cp = mname + strlen(dname) + 1;
306
307 while (*cp != '\0') {
308 if (*cp == '/')
309 *cp = '_';
310 cp++;
311 }
312 }
313 free(tp);
314 return (mname);
315 }
316
317 /*
318 * Return true if running ${.MAKE}
319 * Bypassed if target is flagged .MAKE
320 */
321 static int
is_submake(void * cmdp,void * gnp)322 is_submake(void *cmdp, void *gnp)
323 {
324 static char *p_make = NULL;
325 static int p_len;
326 char *cmd = cmdp;
327 GNode *gn = gnp;
328 char *mp = NULL;
329 char *cp;
330 char *cp2;
331 int rc = 0; /* keep looking */
332
333 if (!p_make) {
334 p_make = Var_Value(".MAKE", gn, &cp);
335 p_len = strlen(p_make);
336 }
337 cp = strchr(cmd, '$');
338 if ((cp)) {
339 mp = Var_Subst(NULL, cmd, gn, VARF_WANTRES);
340 cmd = mp;
341 }
342 cp2 = strstr(cmd, p_make);
343 if ((cp2)) {
344 switch (cp2[p_len]) {
345 case '\0':
346 case ' ':
347 case '\t':
348 case '\n':
349 rc = 1;
350 break;
351 }
352 if (cp2 > cmd && rc > 0) {
353 switch (cp2[-1]) {
354 case ' ':
355 case '\t':
356 case '\n':
357 break;
358 default:
359 rc = 0; /* no match */
360 break;
361 }
362 }
363 }
364 free(mp);
365 return (rc);
366 }
367
368 typedef struct meta_file_s {
369 FILE *fp;
370 GNode *gn;
371 } meta_file_t;
372
373 static int
printCMD(void * cmdp,void * mfpp)374 printCMD(void *cmdp, void *mfpp)
375 {
376 meta_file_t *mfp = mfpp;
377 char *cmd = cmdp;
378 char *cp = NULL;
379
380 if (strchr(cmd, '$')) {
381 cmd = cp = Var_Subst(NULL, cmd, mfp->gn, VARF_WANTRES);
382 }
383 fprintf(mfp->fp, "CMD %s\n", cmd);
384 free(cp);
385 return 0;
386 }
387
388 /*
389 * Certain node types never get a .meta file
390 */
391 #define SKIP_META_TYPE(_type) do { \
392 if ((gn->type & __CONCAT(OP_, _type))) { \
393 if (verbose) { \
394 fprintf(debug_file, "Skipping meta for %s: .%s\n", \
395 gn->name, __STRING(_type)); \
396 } \
397 return FALSE; \
398 } \
399 } while (0)
400
401
402 /*
403 * Do we need/want a .meta file ?
404 */
405 static Boolean
meta_needed(GNode * gn,const char * dname,char * objdir,int verbose)406 meta_needed(GNode *gn, const char *dname,
407 char *objdir, int verbose)
408 {
409 struct stat fs;
410
411 if (verbose)
412 verbose = DEBUG(META);
413
414 /* This may be a phony node which we don't want meta data for... */
415 /* Skip .meta for .BEGIN, .END, .ERROR etc as well. */
416 /* Or it may be explicitly flagged as .NOMETA */
417 SKIP_META_TYPE(NOMETA);
418 /* Unless it is explicitly flagged as .META */
419 if (!(gn->type & OP_META)) {
420 SKIP_META_TYPE(PHONY);
421 SKIP_META_TYPE(SPECIAL);
422 SKIP_META_TYPE(MAKE);
423 }
424
425 /* Check if there are no commands to execute. */
426 if (Lst_IsEmpty(gn->commands)) {
427 if (verbose)
428 fprintf(debug_file, "Skipping meta for %s: no commands\n",
429 gn->name);
430 return FALSE;
431 }
432 if ((gn->type & (OP_META|OP_SUBMAKE)) == OP_SUBMAKE) {
433 /* OP_SUBMAKE is a bit too aggressive */
434 if (Lst_ForEach(gn->commands, is_submake, gn)) {
435 if (DEBUG(META))
436 fprintf(debug_file, "Skipping meta for %s: .SUBMAKE\n",
437 gn->name);
438 return FALSE;
439 }
440 }
441
442 /* The object directory may not exist. Check it.. */
443 if (cached_stat(dname, &fs) != 0) {
444 if (verbose)
445 fprintf(debug_file, "Skipping meta for %s: no .OBJDIR\n",
446 gn->name);
447 return FALSE;
448 }
449
450 /* make sure these are canonical */
451 if (cached_realpath(dname, objdir))
452 dname = objdir;
453
454 /* If we aren't in the object directory, don't create a meta file. */
455 if (!metaCurdirOk && strcmp(curdir, dname) == 0) {
456 if (verbose)
457 fprintf(debug_file, "Skipping meta for %s: .OBJDIR == .CURDIR\n",
458 gn->name);
459 return FALSE;
460 }
461 return TRUE;
462 }
463
464
465 static FILE *
meta_create(BuildMon * pbm,GNode * gn)466 meta_create(BuildMon *pbm, GNode *gn)
467 {
468 meta_file_t mf;
469 char buf[MAXPATHLEN];
470 char objdir[MAXPATHLEN];
471 char **ptr;
472 const char *dname;
473 const char *tname;
474 char *fname;
475 const char *cp;
476 char *p[4]; /* >= possible uses */
477 int i;
478
479 mf.fp = NULL;
480 i = 0;
481
482 dname = Var_Value(".OBJDIR", gn, &p[i++]);
483 tname = Var_Value(TARGET, gn, &p[i++]);
484
485 /* if this succeeds objdir is realpath of dname */
486 if (!meta_needed(gn, dname, objdir, TRUE))
487 goto out;
488 dname = objdir;
489
490 if (metaVerbose) {
491 char *mp;
492
493 /* Describe the target we are building */
494 mp = Var_Subst(NULL, "${" MAKE_META_PREFIX "}", gn, VARF_WANTRES);
495 if (*mp)
496 fprintf(stdout, "%s\n", mp);
497 free(mp);
498 }
499 /* Get the basename of the target */
500 if ((cp = strrchr(tname, '/')) == NULL) {
501 cp = tname;
502 } else {
503 cp++;
504 }
505
506 fflush(stdout);
507
508 if (!writeMeta)
509 /* Don't create meta data. */
510 goto out;
511
512 fname = meta_name(pbm->meta_fname, sizeof(pbm->meta_fname),
513 dname, tname, objdir);
514
515 #ifdef DEBUG_META_MODE
516 if (DEBUG(META))
517 fprintf(debug_file, "meta_create: %s\n", fname);
518 #endif
519
520 if ((mf.fp = fopen(fname, "w")) == NULL)
521 err(1, "Could not open meta file '%s'", fname);
522
523 fprintf(mf.fp, "# Meta data file %s\n", fname);
524
525 mf.gn = gn;
526
527 Lst_ForEach(gn->commands, printCMD, &mf);
528
529 fprintf(mf.fp, "CWD %s\n", getcwd(buf, sizeof(buf)));
530 fprintf(mf.fp, "TARGET %s\n", tname);
531
532 if (metaEnv) {
533 for (ptr = environ; *ptr != NULL; ptr++)
534 fprintf(mf.fp, "ENV %s\n", *ptr);
535 }
536
537 fprintf(mf.fp, "-- command output --\n");
538 fflush(mf.fp);
539
540 Var_Append(".MAKE.META.FILES", fname, VAR_GLOBAL);
541 Var_Append(".MAKE.META.CREATED", fname, VAR_GLOBAL);
542
543 gn->type |= OP_META; /* in case anyone wants to know */
544 if (metaSilent) {
545 gn->type |= OP_SILENT;
546 }
547 out:
548 for (i--; i >= 0; i--) {
549 free(p[i]);
550 }
551
552 return (mf.fp);
553 }
554
555 static Boolean
boolValue(char * s)556 boolValue(char *s)
557 {
558 switch(*s) {
559 case '0':
560 case 'N':
561 case 'n':
562 case 'F':
563 case 'f':
564 return FALSE;
565 }
566 return TRUE;
567 }
568
569 /*
570 * Initialization we need before reading makefiles.
571 */
572 void
meta_init(void)573 meta_init(void)
574 {
575 #ifdef USE_FILEMON
576 /* this allows makefiles to test if we have filemon support */
577 Var_Set(".MAKE.PATH_FILEMON", _PATH_FILEMON, VAR_GLOBAL, 0);
578 #endif
579 }
580
581
582 #define get_mode_bf(bf, token) \
583 if ((cp = strstr(make_mode, token))) \
584 bf = boolValue(&cp[sizeof(token) - 1])
585
586 /*
587 * Initialization we need after reading makefiles.
588 */
589 void
meta_mode_init(const char * make_mode)590 meta_mode_init(const char *make_mode)
591 {
592 static int once = 0;
593 char *cp;
594
595 useMeta = TRUE;
596 useFilemon = TRUE;
597 writeMeta = TRUE;
598
599 if (make_mode) {
600 if (strstr(make_mode, "env"))
601 metaEnv = TRUE;
602 if (strstr(make_mode, "verb"))
603 metaVerbose = TRUE;
604 if (strstr(make_mode, "read"))
605 writeMeta = FALSE;
606 if (strstr(make_mode, "nofilemon"))
607 useFilemon = FALSE;
608 if (strstr(make_mode, "ignore-cmd"))
609 metaIgnoreCMDs = TRUE;
610 if (useFilemon)
611 get_mode_bf(filemonMissing, "missing-filemon=");
612 get_mode_bf(metaCurdirOk, "curdirok=");
613 get_mode_bf(metaMissing, "missing-meta=");
614 get_mode_bf(metaSilent, "silent=");
615 }
616 if (metaVerbose && !Var_Exists(MAKE_META_PREFIX, VAR_GLOBAL)) {
617 /*
618 * The default value for MAKE_META_PREFIX
619 * prints the absolute path of the target.
620 * This works be cause :H will generate '.' if there is no /
621 * and :tA will resolve that to cwd.
622 */
623 Var_Set(MAKE_META_PREFIX, "Building ${.TARGET:H:tA}/${.TARGET:T}", VAR_GLOBAL, 0);
624 }
625 if (once)
626 return;
627 once = 1;
628 memset(&Mybm, 0, sizeof(Mybm));
629 /*
630 * We consider ourselves master of all within ${.MAKE.META.BAILIWICK}
631 */
632 metaBailiwick = Lst_Init(FALSE);
633 metaBailiwickStr = Var_Subst(NULL, "${.MAKE.META.BAILIWICK:O:u:tA}",
634 VAR_GLOBAL, VARF_WANTRES);
635 if (metaBailiwickStr) {
636 str2Lst_Append(metaBailiwick, metaBailiwickStr, NULL);
637 }
638 /*
639 * We ignore any paths that start with ${.MAKE.META.IGNORE_PATHS}
640 */
641 metaIgnorePaths = Lst_Init(FALSE);
642 Var_Append(MAKE_META_IGNORE_PATHS,
643 "/dev /etc /proc /tmp /var/run /var/tmp ${TMPDIR}", VAR_GLOBAL);
644 metaIgnorePathsStr = Var_Subst(NULL,
645 "${" MAKE_META_IGNORE_PATHS ":O:u:tA}", VAR_GLOBAL,
646 VARF_WANTRES);
647 if (metaIgnorePathsStr) {
648 str2Lst_Append(metaIgnorePaths, metaIgnorePathsStr, NULL);
649 }
650
651 /*
652 * We ignore any paths that match ${.MAKE.META.IGNORE_PATTERNS}
653 */
654 cp = NULL;
655 if (Var_Value(MAKE_META_IGNORE_PATTERNS, VAR_GLOBAL, &cp)) {
656 metaIgnorePatterns = TRUE;
657 free(cp);
658 }
659 cp = NULL;
660 if (Var_Value(MAKE_META_IGNORE_FILTER, VAR_GLOBAL, &cp)) {
661 metaIgnoreFilter = TRUE;
662 free(cp);
663 }
664 }
665
666 /*
667 * In each case below we allow for job==NULL
668 */
669 void
meta_job_start(Job * job,GNode * gn)670 meta_job_start(Job *job, GNode *gn)
671 {
672 BuildMon *pbm;
673
674 if (job != NULL) {
675 pbm = &job->bm;
676 } else {
677 pbm = &Mybm;
678 }
679 pbm->mfp = meta_create(pbm, gn);
680 #ifdef USE_FILEMON_ONCE
681 /* compat mode we open the filemon dev once per command */
682 if (job == NULL)
683 return;
684 #endif
685 #ifdef USE_FILEMON
686 if (pbm->mfp != NULL && useFilemon) {
687 filemon_open(pbm);
688 } else {
689 pbm->mon_fd = pbm->filemon_fd = -1;
690 }
691 #endif
692 }
693
694 /*
695 * The child calls this before doing anything.
696 * It does not disturb our state.
697 */
698 void
meta_job_child(Job * job)699 meta_job_child(Job *job)
700 {
701 #ifdef USE_FILEMON
702 BuildMon *pbm;
703
704 if (job != NULL) {
705 pbm = &job->bm;
706 } else {
707 pbm = &Mybm;
708 }
709 if (pbm->mfp != NULL) {
710 close(fileno(pbm->mfp));
711 if (useFilemon) {
712 pid_t pid;
713
714 pid = getpid();
715 if (ioctl(pbm->filemon_fd, FILEMON_SET_PID, &pid) < 0) {
716 err(1, "Could not set filemon pid!");
717 }
718 }
719 }
720 #endif
721 }
722
723 void
meta_job_error(Job * job,GNode * gn,int flags,int status)724 meta_job_error(Job *job, GNode *gn, int flags, int status)
725 {
726 char cwd[MAXPATHLEN];
727 BuildMon *pbm;
728
729 if (job != NULL) {
730 pbm = &job->bm;
731 if (!gn)
732 gn = job->node;
733 } else {
734 pbm = &Mybm;
735 }
736 if (pbm->mfp != NULL) {
737 fprintf(pbm->mfp, "\n*** Error code %d%s\n",
738 status,
739 (flags & JOB_IGNERR) ?
740 "(ignored)" : "");
741 }
742 if (gn) {
743 Var_Set(".ERROR_TARGET", gn->path ? gn->path : gn->name, VAR_GLOBAL, 0);
744 }
745 getcwd(cwd, sizeof(cwd));
746 Var_Set(".ERROR_CWD", cwd, VAR_GLOBAL, 0);
747 if (pbm->meta_fname[0]) {
748 Var_Set(".ERROR_META_FILE", pbm->meta_fname, VAR_GLOBAL, 0);
749 }
750 meta_job_finish(job);
751 }
752
753 void
meta_job_output(Job * job,char * cp,const char * nl)754 meta_job_output(Job *job, char *cp, const char *nl)
755 {
756 BuildMon *pbm;
757
758 if (job != NULL) {
759 pbm = &job->bm;
760 } else {
761 pbm = &Mybm;
762 }
763 if (pbm->mfp != NULL) {
764 if (metaVerbose) {
765 static char *meta_prefix = NULL;
766 static int meta_prefix_len;
767
768 if (!meta_prefix) {
769 char *cp2;
770
771 meta_prefix = Var_Subst(NULL, "${" MAKE_META_PREFIX "}",
772 VAR_GLOBAL, VARF_WANTRES);
773 if ((cp2 = strchr(meta_prefix, '$')))
774 meta_prefix_len = cp2 - meta_prefix;
775 else
776 meta_prefix_len = strlen(meta_prefix);
777 }
778 if (strncmp(cp, meta_prefix, meta_prefix_len) == 0) {
779 cp = strchr(cp+1, '\n');
780 if (!cp++)
781 return;
782 }
783 }
784 fprintf(pbm->mfp, "%s%s", cp, nl);
785 }
786 }
787
788 int
meta_cmd_finish(void * pbmp)789 meta_cmd_finish(void *pbmp)
790 {
791 int error = 0;
792 BuildMon *pbm = pbmp;
793 #ifdef USE_FILEMON
794 int x;
795 #endif
796
797 if (!pbm)
798 pbm = &Mybm;
799
800 #ifdef USE_FILEMON
801 if (pbm->filemon_fd >= 0) {
802 if (close(pbm->filemon_fd) < 0)
803 error = errno;
804 x = filemon_read(pbm->mfp, pbm->mon_fd);
805 if (error == 0 && x != 0)
806 error = x;
807 pbm->filemon_fd = pbm->mon_fd = -1;
808 } else
809 #endif
810 fprintf(pbm->mfp, "\n"); /* ensure end with newline */
811 return error;
812 }
813
814 int
meta_job_finish(Job * job)815 meta_job_finish(Job *job)
816 {
817 BuildMon *pbm;
818 int error = 0;
819 int x;
820
821 if (job != NULL) {
822 pbm = &job->bm;
823 } else {
824 pbm = &Mybm;
825 }
826 if (pbm->mfp != NULL) {
827 error = meta_cmd_finish(pbm);
828 x = fclose(pbm->mfp);
829 if (error == 0 && x != 0)
830 error = errno;
831 pbm->mfp = NULL;
832 pbm->meta_fname[0] = '\0';
833 }
834 return error;
835 }
836
837 void
meta_finish(void)838 meta_finish(void)
839 {
840 Lst_Destroy(metaBailiwick, NULL);
841 free(metaBailiwickStr);
842 Lst_Destroy(metaIgnorePaths, NULL);
843 free(metaIgnorePathsStr);
844 }
845
846 /*
847 * Fetch a full line from fp - growing bufp if needed
848 * Return length in bufp.
849 */
850 static int
fgetLine(char ** bufp,size_t * szp,int o,FILE * fp)851 fgetLine(char **bufp, size_t *szp, int o, FILE *fp)
852 {
853 char *buf = *bufp;
854 size_t bufsz = *szp;
855 struct stat fs;
856 int x;
857
858 if (fgets(&buf[o], bufsz - o, fp) != NULL) {
859 check_newline:
860 x = o + strlen(&buf[o]);
861 if (buf[x - 1] == '\n')
862 return x;
863 /*
864 * We need to grow the buffer.
865 * The meta file can give us a clue.
866 */
867 if (fstat(fileno(fp), &fs) == 0) {
868 size_t newsz;
869 char *p;
870
871 newsz = ROUNDUP((fs.st_size / 2), BUFSIZ);
872 if (newsz <= bufsz)
873 newsz = ROUNDUP(fs.st_size, BUFSIZ);
874 if (newsz <= bufsz)
875 return x; /* truncated */
876 if (DEBUG(META))
877 fprintf(debug_file, "growing buffer %u -> %u\n",
878 (unsigned)bufsz, (unsigned)newsz);
879 p = bmake_realloc(buf, newsz);
880 if (p) {
881 *bufp = buf = p;
882 *szp = bufsz = newsz;
883 /* fetch the rest */
884 if (!fgets(&buf[x], bufsz - x, fp))
885 return x; /* truncated! */
886 goto check_newline;
887 }
888 }
889 }
890 return 0;
891 }
892
893 /* Lst_ForEach wants 1 to stop search */
894 static int
prefix_match(void * p,void * q)895 prefix_match(void *p, void *q)
896 {
897 const char *prefix = p;
898 const char *path = q;
899 size_t n = strlen(prefix);
900
901 return (0 == strncmp(path, prefix, n));
902 }
903
904 /*
905 * looking for exact or prefix/ match to
906 * Lst_Find wants 0 to stop search
907 */
908 static int
path_match(const void * p,const void * q)909 path_match(const void *p, const void *q)
910 {
911 const char *prefix = q;
912 const char *path = p;
913 size_t n = strlen(prefix);
914 int rc;
915
916 if ((rc = strncmp(path, prefix, n)) == 0) {
917 switch (path[n]) {
918 case '\0':
919 case '/':
920 break;
921 default:
922 rc = 1;
923 break;
924 }
925 }
926 return rc;
927 }
928
929 /* Lst_Find wants 0 to stop search */
930 static int
string_match(const void * p,const void * q)931 string_match(const void *p, const void *q)
932 {
933 const char *p1 = p;
934 const char *p2 = q;
935
936 return strcmp(p1, p2);
937 }
938
939
940 static int
meta_ignore(GNode * gn,const char * p)941 meta_ignore(GNode *gn, const char *p)
942 {
943 char fname[MAXPATHLEN];
944
945 if (p == NULL)
946 return TRUE;
947
948 if (*p == '/') {
949 cached_realpath(p, fname); /* clean it up */
950 if (Lst_ForEach(metaIgnorePaths, prefix_match, fname)) {
951 #ifdef DEBUG_META_MODE
952 if (DEBUG(META))
953 fprintf(debug_file, "meta_oodate: ignoring path: %s\n",
954 p);
955 #endif
956 return TRUE;
957 }
958 }
959
960 if (metaIgnorePatterns) {
961 char *pm;
962
963 Var_Set(".p.", p, gn, 0);
964 pm = Var_Subst(NULL,
965 "${" MAKE_META_IGNORE_PATTERNS ":@m@${.p.:M$m}@}",
966 gn, VARF_WANTRES);
967 if (*pm) {
968 #ifdef DEBUG_META_MODE
969 if (DEBUG(META))
970 fprintf(debug_file, "meta_oodate: ignoring pattern: %s\n",
971 p);
972 #endif
973 free(pm);
974 return TRUE;
975 }
976 free(pm);
977 }
978
979 if (metaIgnoreFilter) {
980 char *fm;
981
982 /* skip if filter result is empty */
983 snprintf(fname, sizeof(fname),
984 "${%s:L:${%s:ts:}}",
985 p, MAKE_META_IGNORE_FILTER);
986 fm = Var_Subst(NULL, fname, gn, VARF_WANTRES);
987 if (*fm == '\0') {
988 #ifdef DEBUG_META_MODE
989 if (DEBUG(META))
990 fprintf(debug_file, "meta_oodate: ignoring filtered: %s\n",
991 p);
992 #endif
993 free(fm);
994 return TRUE;
995 }
996 free(fm);
997 }
998 return FALSE;
999 }
1000
1001 /*
1002 * When running with 'meta' functionality, a target can be out-of-date
1003 * if any of the references in its meta data file is more recent.
1004 * We have to track the latestdir on a per-process basis.
1005 */
1006 #define LCWD_VNAME_FMT ".meta.%d.lcwd"
1007 #define LDIR_VNAME_FMT ".meta.%d.ldir"
1008
1009 /*
1010 * It is possible that a .meta file is corrupted,
1011 * if we detect this we want to reproduce it.
1012 * Setting oodate TRUE will have that effect.
1013 */
1014 #define CHECK_VALID_META(p) if (!(p && *p)) { \
1015 warnx("%s: %d: malformed", fname, lineno); \
1016 oodate = TRUE; \
1017 continue; \
1018 }
1019
1020 #define DEQUOTE(p) if (*p == '\'') { \
1021 char *ep; \
1022 p++; \
1023 if ((ep = strchr(p, '\''))) \
1024 *ep = '\0'; \
1025 }
1026
1027 Boolean
meta_oodate(GNode * gn,Boolean oodate)1028 meta_oodate(GNode *gn, Boolean oodate)
1029 {
1030 static char *tmpdir = NULL;
1031 static char cwd[MAXPATHLEN];
1032 char lcwd_vname[64];
1033 char ldir_vname[64];
1034 char lcwd[MAXPATHLEN];
1035 char latestdir[MAXPATHLEN];
1036 char fname[MAXPATHLEN];
1037 char fname1[MAXPATHLEN];
1038 char fname2[MAXPATHLEN];
1039 char fname3[MAXPATHLEN];
1040 const char *dname;
1041 const char *tname;
1042 char *p;
1043 char *cp;
1044 char *link_src;
1045 char *move_target;
1046 static size_t cwdlen = 0;
1047 static size_t tmplen = 0;
1048 FILE *fp;
1049 Boolean needOODATE = FALSE;
1050 Lst missingFiles;
1051 char *pa[4]; /* >= possible uses */
1052 int i;
1053 int have_filemon = FALSE;
1054
1055 if (oodate)
1056 return oodate; /* we're done */
1057
1058 i = 0;
1059
1060 dname = Var_Value(".OBJDIR", gn, &pa[i++]);
1061 tname = Var_Value(TARGET, gn, &pa[i++]);
1062
1063 /* if this succeeds fname3 is realpath of dname */
1064 if (!meta_needed(gn, dname, fname3, FALSE))
1065 goto oodate_out;
1066 dname = fname3;
1067
1068 missingFiles = Lst_Init(FALSE);
1069
1070 /*
1071 * We need to check if the target is out-of-date. This includes
1072 * checking if the expanded command has changed. This in turn
1073 * requires that all variables are set in the same way that they
1074 * would be if the target needs to be re-built.
1075 */
1076 Make_DoAllVar(gn);
1077
1078 meta_name(fname, sizeof(fname), dname, tname, dname);
1079
1080 #ifdef DEBUG_META_MODE
1081 if (DEBUG(META))
1082 fprintf(debug_file, "meta_oodate: %s\n", fname);
1083 #endif
1084
1085 if ((fp = fopen(fname, "r")) != NULL) {
1086 static char *buf = NULL;
1087 static size_t bufsz;
1088 int lineno = 0;
1089 int lastpid = 0;
1090 int pid;
1091 int x;
1092 LstNode ln;
1093 struct stat fs;
1094
1095 if (!buf) {
1096 bufsz = 8 * BUFSIZ;
1097 buf = bmake_malloc(bufsz);
1098 }
1099
1100 if (!cwdlen) {
1101 if (getcwd(cwd, sizeof(cwd)) == NULL)
1102 err(1, "Could not get current working directory");
1103 cwdlen = strlen(cwd);
1104 }
1105 strlcpy(lcwd, cwd, sizeof(lcwd));
1106 strlcpy(latestdir, cwd, sizeof(latestdir));
1107
1108 if (!tmpdir) {
1109 tmpdir = getTmpdir();
1110 tmplen = strlen(tmpdir);
1111 }
1112
1113 /* we want to track all the .meta we read */
1114 Var_Append(".MAKE.META.FILES", fname, VAR_GLOBAL);
1115
1116 ln = Lst_First(gn->commands);
1117 while (!oodate && (x = fgetLine(&buf, &bufsz, 0, fp)) > 0) {
1118 lineno++;
1119 if (buf[x - 1] == '\n')
1120 buf[x - 1] = '\0';
1121 else {
1122 warnx("%s: %d: line truncated at %u", fname, lineno, x);
1123 oodate = TRUE;
1124 break;
1125 }
1126 link_src = NULL;
1127 move_target = NULL;
1128 /* Find the start of the build monitor section. */
1129 if (!have_filemon) {
1130 if (strncmp(buf, "-- filemon", 10) == 0) {
1131 have_filemon = TRUE;
1132 continue;
1133 }
1134 if (strncmp(buf, "# buildmon", 10) == 0) {
1135 have_filemon = TRUE;
1136 continue;
1137 }
1138 }
1139
1140 /* Delimit the record type. */
1141 p = buf;
1142 #ifdef DEBUG_META_MODE
1143 if (DEBUG(META))
1144 fprintf(debug_file, "%s: %d: %s\n", fname, lineno, buf);
1145 #endif
1146 strsep(&p, " ");
1147 if (have_filemon) {
1148 /*
1149 * We are in the 'filemon' output section.
1150 * Each record from filemon follows the general form:
1151 *
1152 * <key> <pid> <data>
1153 *
1154 * Where:
1155 * <key> is a single letter, denoting the syscall.
1156 * <pid> is the process that made the syscall.
1157 * <data> is the arguments (of interest).
1158 */
1159 switch(buf[0]) {
1160 case '#': /* comment */
1161 case 'V': /* version */
1162 break;
1163 default:
1164 /*
1165 * We need to track pathnames per-process.
1166 *
1167 * Each process run by make, starts off in the 'CWD'
1168 * recorded in the .meta file, if it chdirs ('C')
1169 * elsewhere we need to track that - but only for
1170 * that process. If it forks ('F'), we initialize
1171 * the child to have the same cwd as its parent.
1172 *
1173 * We also need to track the 'latestdir' of
1174 * interest. This is usually the same as cwd, but
1175 * not if a process is reading directories.
1176 *
1177 * Each time we spot a different process ('pid')
1178 * we save the current value of 'latestdir' in a
1179 * variable qualified by 'lastpid', and
1180 * re-initialize 'latestdir' to any pre-saved
1181 * value for the current 'pid' and 'CWD' if none.
1182 */
1183 CHECK_VALID_META(p);
1184 pid = atoi(p);
1185 if (pid > 0 && pid != lastpid) {
1186 char *ldir;
1187 char *tp;
1188
1189 if (lastpid > 0) {
1190 /* We need to remember these. */
1191 Var_Set(lcwd_vname, lcwd, VAR_GLOBAL, 0);
1192 Var_Set(ldir_vname, latestdir, VAR_GLOBAL, 0);
1193 }
1194 snprintf(lcwd_vname, sizeof(lcwd_vname), LCWD_VNAME_FMT, pid);
1195 snprintf(ldir_vname, sizeof(ldir_vname), LDIR_VNAME_FMT, pid);
1196 lastpid = pid;
1197 ldir = Var_Value(ldir_vname, VAR_GLOBAL, &tp);
1198 if (ldir) {
1199 strlcpy(latestdir, ldir, sizeof(latestdir));
1200 free(tp);
1201 }
1202 ldir = Var_Value(lcwd_vname, VAR_GLOBAL, &tp);
1203 if (ldir) {
1204 strlcpy(lcwd, ldir, sizeof(lcwd));
1205 free(tp);
1206 }
1207 }
1208 /* Skip past the pid. */
1209 if (strsep(&p, " ") == NULL)
1210 continue;
1211 #ifdef DEBUG_META_MODE
1212 if (DEBUG(META))
1213 fprintf(debug_file, "%s: %d: %d: %c: cwd=%s lcwd=%s ldir=%s\n",
1214 fname, lineno,
1215 pid, buf[0], cwd, lcwd, latestdir);
1216 #endif
1217 break;
1218 }
1219
1220 CHECK_VALID_META(p);
1221
1222 /* Process according to record type. */
1223 switch (buf[0]) {
1224 case 'X': /* eXit */
1225 Var_Delete(lcwd_vname, VAR_GLOBAL);
1226 Var_Delete(ldir_vname, VAR_GLOBAL);
1227 lastpid = 0; /* no need to save ldir_vname */
1228 break;
1229
1230 case 'F': /* [v]Fork */
1231 {
1232 char cldir[64];
1233 int child;
1234
1235 child = atoi(p);
1236 if (child > 0) {
1237 snprintf(cldir, sizeof(cldir), LCWD_VNAME_FMT, child);
1238 Var_Set(cldir, lcwd, VAR_GLOBAL, 0);
1239 snprintf(cldir, sizeof(cldir), LDIR_VNAME_FMT, child);
1240 Var_Set(cldir, latestdir, VAR_GLOBAL, 0);
1241 #ifdef DEBUG_META_MODE
1242 if (DEBUG(META))
1243 fprintf(debug_file, "%s: %d: %d: cwd=%s lcwd=%s ldir=%s\n",
1244 fname, lineno,
1245 child, cwd, lcwd, latestdir);
1246 #endif
1247 }
1248 }
1249 break;
1250
1251 case 'C': /* Chdir */
1252 /* Update lcwd and latest directory. */
1253 strlcpy(latestdir, p, sizeof(latestdir));
1254 strlcpy(lcwd, p, sizeof(lcwd));
1255 Var_Set(lcwd_vname, lcwd, VAR_GLOBAL, 0);
1256 Var_Set(ldir_vname, lcwd, VAR_GLOBAL, 0);
1257 #ifdef DEBUG_META_MODE
1258 if (DEBUG(META))
1259 fprintf(debug_file, "%s: %d: cwd=%s ldir=%s\n", fname, lineno, cwd, lcwd);
1260 #endif
1261 break;
1262
1263 case 'M': /* renaMe */
1264 /*
1265 * For 'M'oves we want to check
1266 * the src as for 'R'ead
1267 * and the target as for 'W'rite.
1268 */
1269 cp = p; /* save this for a second */
1270 /* now get target */
1271 if (strsep(&p, " ") == NULL)
1272 continue;
1273 CHECK_VALID_META(p);
1274 move_target = p;
1275 p = cp;
1276 /* 'L' and 'M' put single quotes around the args */
1277 DEQUOTE(p);
1278 DEQUOTE(move_target);
1279 /* FALLTHROUGH */
1280 case 'D': /* unlink */
1281 if (*p == '/' && !Lst_IsEmpty(missingFiles)) {
1282 /* remove any missingFiles entries that match p */
1283 if ((ln = Lst_Find(missingFiles, p,
1284 path_match)) != NULL) {
1285 LstNode nln;
1286 char *tp;
1287
1288 do {
1289 nln = Lst_FindFrom(missingFiles, Lst_Succ(ln),
1290 p, path_match);
1291 tp = Lst_Datum(ln);
1292 Lst_Remove(missingFiles, ln);
1293 free(tp);
1294 } while ((ln = nln) != NULL);
1295 }
1296 }
1297 if (buf[0] == 'M') {
1298 /* the target of the mv is a file 'W'ritten */
1299 #ifdef DEBUG_META_MODE
1300 if (DEBUG(META))
1301 fprintf(debug_file, "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 if (DEBUG(META))
1324 fprintf(debug_file, "meta_oodate: L %s -> %s\n",
1325 link_src, p);
1326 #endif
1327 /* FALLTHROUGH */
1328 case 'W': /* Write */
1329 check_write:
1330 /*
1331 * If a file we generated within our bailiwick
1332 * but outside of .OBJDIR is missing,
1333 * we need to do it again.
1334 */
1335 /* ignore non-absolute paths */
1336 if (*p != '/')
1337 break;
1338
1339 if (Lst_IsEmpty(metaBailiwick))
1340 break;
1341
1342 /* ignore cwd - normal dependencies handle those */
1343 if (strncmp(p, cwd, cwdlen) == 0)
1344 break;
1345
1346 if (!Lst_ForEach(metaBailiwick, prefix_match, p))
1347 break;
1348
1349 /* tmpdir might be within */
1350 if (tmplen > 0 && strncmp(p, tmpdir, tmplen) == 0)
1351 break;
1352
1353 /* ignore anything containing the string "tmp" */
1354 if ((strstr("tmp", p)))
1355 break;
1356
1357 if ((link_src != NULL && cached_lstat(p, &fs) < 0) ||
1358 (link_src == NULL && cached_stat(p, &fs) < 0)) {
1359 if (!meta_ignore(gn, p)) {
1360 if (Lst_Find(missingFiles, p, string_match) == NULL)
1361 Lst_AtEnd(missingFiles, bmake_strdup(p));
1362 }
1363 }
1364 break;
1365 check_link_src:
1366 p = link_src;
1367 link_src = NULL;
1368 #ifdef DEBUG_META_MODE
1369 if (DEBUG(META))
1370 fprintf(debug_file, "meta_oodate: L src %s\n", p);
1371 #endif
1372 /* FALLTHROUGH */
1373 case 'R': /* Read */
1374 case 'E': /* Exec */
1375 /*
1376 * Check for runtime files that can't
1377 * be part of the dependencies because
1378 * they are _expected_ to change.
1379 */
1380 if (meta_ignore(gn, p))
1381 break;
1382
1383 /*
1384 * The rest of the record is the file name.
1385 * Check if it's not an absolute path.
1386 */
1387 {
1388 char *sdirs[4];
1389 char **sdp;
1390 int sdx = 0;
1391 int found = 0;
1392
1393 if (*p == '/') {
1394 sdirs[sdx++] = p; /* done */
1395 } else {
1396 if (strcmp(".", p) == 0)
1397 continue; /* no point */
1398
1399 /* Check vs latestdir */
1400 snprintf(fname1, sizeof(fname1), "%s/%s", latestdir, p);
1401 sdirs[sdx++] = fname1;
1402
1403 if (strcmp(latestdir, lcwd) != 0) {
1404 /* Check vs lcwd */
1405 snprintf(fname2, sizeof(fname2), "%s/%s", lcwd, p);
1406 sdirs[sdx++] = fname2;
1407 }
1408 if (strcmp(lcwd, cwd) != 0) {
1409 /* Check vs cwd */
1410 snprintf(fname3, sizeof(fname3), "%s/%s", cwd, p);
1411 sdirs[sdx++] = fname3;
1412 }
1413 }
1414 sdirs[sdx++] = NULL;
1415
1416 for (sdp = sdirs; *sdp && !found; sdp++) {
1417 #ifdef DEBUG_META_MODE
1418 if (DEBUG(META))
1419 fprintf(debug_file, "%s: %d: looking for: %s\n", fname, lineno, *sdp);
1420 #endif
1421 if (cached_stat(*sdp, &fs) == 0) {
1422 found = 1;
1423 p = *sdp;
1424 }
1425 }
1426 if (found) {
1427 #ifdef DEBUG_META_MODE
1428 if (DEBUG(META))
1429 fprintf(debug_file, "%s: %d: found: %s\n", fname, lineno, p);
1430 #endif
1431 if (!S_ISDIR(fs.st_mode) &&
1432 fs.st_mtime > gn->mtime) {
1433 if (DEBUG(META))
1434 fprintf(debug_file, "%s: %d: file '%s' is newer than the target...\n", fname, lineno, p);
1435 oodate = TRUE;
1436 } else if (S_ISDIR(fs.st_mode)) {
1437 /* Update the latest directory. */
1438 cached_realpath(p, latestdir);
1439 }
1440 } else if (errno == ENOENT && *p == '/' &&
1441 strncmp(p, cwd, cwdlen) != 0) {
1442 /*
1443 * A referenced file outside of CWD is missing.
1444 * We cannot catch every eventuality here...
1445 */
1446 if (Lst_Find(missingFiles, p, string_match) == NULL)
1447 Lst_AtEnd(missingFiles, bmake_strdup(p));
1448 }
1449 }
1450 if (buf[0] == 'E') {
1451 /* previous latestdir is no longer relevant */
1452 strlcpy(latestdir, lcwd, sizeof(latestdir));
1453 }
1454 break;
1455 default:
1456 break;
1457 }
1458 if (!oodate && buf[0] == 'L' && link_src != NULL)
1459 goto check_link_src;
1460 } else if (strcmp(buf, "CMD") == 0) {
1461 /*
1462 * Compare the current command with the one in the
1463 * meta data file.
1464 */
1465 if (ln == NULL) {
1466 if (DEBUG(META))
1467 fprintf(debug_file, "%s: %d: there were more build commands in the meta data file than there are now...\n", fname, lineno);
1468 oodate = TRUE;
1469 } else {
1470 char *cmd = (char *)Lst_Datum(ln);
1471 Boolean hasOODATE = FALSE;
1472
1473 if (strstr(cmd, "$?"))
1474 hasOODATE = TRUE;
1475 else if ((cp = strstr(cmd, ".OODATE"))) {
1476 /* check for $[{(].OODATE[:)}] */
1477 if (cp > cmd + 2 && cp[-2] == '$')
1478 hasOODATE = TRUE;
1479 }
1480 if (hasOODATE) {
1481 needOODATE = TRUE;
1482 if (DEBUG(META))
1483 fprintf(debug_file, "%s: %d: cannot compare command using .OODATE\n", fname, lineno);
1484 }
1485 cmd = Var_Subst(NULL, cmd, gn, VARF_WANTRES|VARF_UNDEFERR);
1486
1487 if ((cp = strchr(cmd, '\n'))) {
1488 int n;
1489
1490 /*
1491 * This command contains newlines, we need to
1492 * fetch more from the .meta file before we
1493 * attempt a comparison.
1494 */
1495 /* first put the newline back at buf[x - 1] */
1496 buf[x - 1] = '\n';
1497 do {
1498 /* now fetch the next line */
1499 if ((n = fgetLine(&buf, &bufsz, x, fp)) <= 0)
1500 break;
1501 x = n;
1502 lineno++;
1503 if (buf[x - 1] != '\n') {
1504 warnx("%s: %d: line truncated at %u", fname, lineno, x);
1505 break;
1506 }
1507 cp = strchr(++cp, '\n');
1508 } while (cp);
1509 if (buf[x - 1] == '\n')
1510 buf[x - 1] = '\0';
1511 }
1512 if (!hasOODATE &&
1513 !(gn->type & OP_NOMETA_CMP) &&
1514 strcmp(p, cmd) != 0) {
1515 if (DEBUG(META))
1516 fprintf(debug_file, "%s: %d: a build command has changed\n%s\nvs\n%s\n", fname, lineno, p, cmd);
1517 if (!metaIgnoreCMDs)
1518 oodate = TRUE;
1519 }
1520 free(cmd);
1521 ln = Lst_Succ(ln);
1522 }
1523 } else if (strcmp(buf, "CWD") == 0) {
1524 /*
1525 * Check if there are extra commands now
1526 * that weren't in the meta data file.
1527 */
1528 if (!oodate && ln != NULL) {
1529 if (DEBUG(META))
1530 fprintf(debug_file, "%s: %d: there are extra build commands now that weren't in the meta data file\n", fname, lineno);
1531 oodate = TRUE;
1532 }
1533 if (strcmp(p, cwd) != 0) {
1534 if (DEBUG(META))
1535 fprintf(debug_file, "%s: %d: the current working directory has changed from '%s' to '%s'\n", fname, lineno, p, curdir);
1536 oodate = TRUE;
1537 }
1538 }
1539 }
1540
1541 fclose(fp);
1542 if (!Lst_IsEmpty(missingFiles)) {
1543 if (DEBUG(META))
1544 fprintf(debug_file, "%s: missing files: %s...\n",
1545 fname, (char *)Lst_Datum(Lst_First(missingFiles)));
1546 oodate = TRUE;
1547 }
1548 if (!oodate && !have_filemon && filemonMissing) {
1549 if (DEBUG(META))
1550 fprintf(debug_file, "%s: missing filemon data\n", fname);
1551 oodate = TRUE;
1552 }
1553 } else {
1554 if (writeMeta && metaMissing) {
1555 cp = NULL;
1556
1557 /* if target is in .CURDIR we do not need a meta file */
1558 if (gn->path && (cp = strrchr(gn->path, '/')) && cp > gn->path) {
1559 if (strncmp(curdir, gn->path, (cp - gn->path)) != 0) {
1560 cp = NULL; /* not in .CURDIR */
1561 }
1562 }
1563 if (!cp) {
1564 if (DEBUG(META))
1565 fprintf(debug_file, "%s: required but missing\n", fname);
1566 oodate = TRUE;
1567 needOODATE = TRUE; /* assume the worst */
1568 }
1569 }
1570 }
1571
1572 Lst_Destroy(missingFiles, (FreeProc *)free);
1573
1574 if (oodate && needOODATE) {
1575 /*
1576 * Target uses .OODATE which is empty; or we wouldn't be here.
1577 * We have decided it is oodate, so .OODATE needs to be set.
1578 * All we can sanely do is set it to .ALLSRC.
1579 */
1580 Var_Delete(OODATE, gn);
1581 Var_Set(OODATE, Var_Value(ALLSRC, gn, &cp), gn, 0);
1582 free(cp);
1583 }
1584
1585 oodate_out:
1586 for (i--; i >= 0; i--) {
1587 free(pa[i]);
1588 }
1589 return oodate;
1590 }
1591
1592 /* support for compat mode */
1593
1594 static int childPipe[2];
1595
1596 void
meta_compat_start(void)1597 meta_compat_start(void)
1598 {
1599 #ifdef USE_FILEMON_ONCE
1600 /*
1601 * We need to re-open filemon for each cmd.
1602 */
1603 BuildMon *pbm = &Mybm;
1604
1605 if (pbm->mfp != NULL && useFilemon) {
1606 filemon_open(pbm);
1607 } else {
1608 pbm->mon_fd = pbm->filemon_fd = -1;
1609 }
1610 #endif
1611 if (pipe(childPipe) < 0)
1612 Punt("Cannot create pipe: %s", strerror(errno));
1613 /* Set close-on-exec flag for both */
1614 (void)fcntl(childPipe[0], F_SETFD, FD_CLOEXEC);
1615 (void)fcntl(childPipe[1], F_SETFD, FD_CLOEXEC);
1616 }
1617
1618 void
meta_compat_child(void)1619 meta_compat_child(void)
1620 {
1621 meta_job_child(NULL);
1622 if (dup2(childPipe[1], 1) < 0 ||
1623 dup2(1, 2) < 0) {
1624 execError("dup2", "pipe");
1625 _exit(1);
1626 }
1627 }
1628
1629 void
meta_compat_parent(void)1630 meta_compat_parent(void)
1631 {
1632 FILE *fp;
1633 char buf[BUFSIZ];
1634
1635 close(childPipe[1]); /* child side */
1636 fp = fdopen(childPipe[0], "r");
1637 while (fgets(buf, sizeof(buf), fp)) {
1638 meta_job_output(NULL, buf, "");
1639 printf("%s", buf);
1640 fflush(stdout);
1641 }
1642 fclose(fp);
1643 }
1644
1645 #endif /* USE_META */
1646