1 /* $NetBSD: meta.c,v 1.220 2026/02/10 18:53:34 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 #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 /* Get the basename of the target */
462 cp = str_basename(tname);
463
464 fflush(stdout);
465
466 if (!writeMeta)
467 /* Don't create meta data. */
468 goto out;
469
470 fname = meta_name(pbm->meta_fname, sizeof pbm->meta_fname,
471 dname.str, tname, objdir_realpath);
472
473 #ifdef DEBUG_META_MODE
474 DEBUG1(META, "meta_create: %s\n", fname);
475 #endif
476
477 if ((fp = fopen(fname, "w")) == NULL)
478 Punt("Could not open meta file '%s': %s", fname, strerror(errno));
479
480 fprintf(fp, "# Meta data file %s\n", fname);
481
482 printCMDs(gn, fp);
483
484 fprintf(fp, "CWD %s\n", getcwd(buf, sizeof buf));
485 fprintf(fp, "TARGET %s\n", tname);
486 cp = GNode_VarOodate(gn);
487 if (cp != NULL && *cp != '\0') {
488 fprintf(fp, "OODATE %s\n", cp);
489 }
490 if (metaEnv) {
491 for (ptr = environ; *ptr != NULL; ptr++)
492 fprintf(fp, "ENV %s\n", *ptr);
493 }
494
495 fprintf(fp, "-- command output --\n");
496 if (fflush(fp) != 0)
497 Punt("Cannot write expanded command to meta file: %s",
498 strerror(errno));
499
500 Global_Append(".MAKE.META.FILES", fname);
501 Global_Append(".MAKE.META.CREATED", fname);
502
503 gn->type |= OP_META; /* in case anyone wants to know */
504 if (metaSilent) {
505 gn->type |= OP_SILENT;
506 }
507 out:
508 FStr_Done(&dname);
509
510 return fp;
511 }
512
513 static bool
boolValue(const char * s)514 boolValue(const char *s)
515 {
516 switch (*s) {
517 case '0':
518 case 'N':
519 case 'n':
520 case 'F':
521 case 'f':
522 return false;
523 }
524 return true;
525 }
526
527 /*
528 * Initialization we need before reading makefiles.
529 */
530 void
meta_init(void)531 meta_init(void)
532 {
533 #ifdef USE_FILEMON
534 /* this allows makefiles to test if we have filemon support */
535 Global_Set(".MAKE.PATH_FILEMON", filemon_path());
536 #endif
537 }
538
539
540 #define get_mode_bf(bf, token) \
541 if ((cp = strstr(make_mode, token)) != NULL) \
542 bf = boolValue(cp + sizeof (token) - 1)
543
544 /*
545 * Initialization we need after reading makefiles.
546 */
547 void
meta_mode_init(const char * make_mode)548 meta_mode_init(const char *make_mode)
549 {
550 static bool once = false;
551 const char *cp;
552
553 useMeta = true;
554 useFilemon = true;
555 writeMeta = true;
556
557 if (make_mode != NULL) {
558 if (strstr(make_mode, "env") != NULL)
559 metaEnv = true;
560 if (strstr(make_mode, "verb") != NULL)
561 metaVerbose = true;
562 if (strstr(make_mode, "read") != NULL)
563 writeMeta = false;
564 if (strstr(make_mode, "nofilemon") != NULL)
565 useFilemon = false;
566 if (strstr(make_mode, "ignore-cmd") != NULL)
567 metaIgnoreCMDs = true;
568 if (useFilemon)
569 get_mode_bf(filemonMissing, "missing-filemon=");
570 get_mode_bf(metaCurdirOk, "curdirok=");
571 get_mode_bf(metaMissing, "missing-meta=");
572 get_mode_bf(metaSilent, "silent=");
573 }
574 if (metaVerbose && !Var_Exists(SCOPE_GLOBAL, MAKE_META_PREFIX)) {
575 /*
576 * The default value for MAKE_META_PREFIX
577 * prints the absolute path of the target.
578 * This works be cause :H will generate '.' if there is no /
579 * and :tA will resolve that to cwd.
580 */
581 Global_Set(MAKE_META_PREFIX,
582 "Building ${.TARGET:H:tA}/${.TARGET:T}");
583 }
584 if (once)
585 return;
586 once = true;
587 memset(&Mybm, 0, sizeof Mybm);
588 /*
589 * We consider ourselves master of all within ${.MAKE.META.BAILIWICK}
590 */
591 metaBailiwickStr = Var_Subst("${.MAKE.META.BAILIWICK:O:u:tA}",
592 SCOPE_GLOBAL, VARE_EVAL);
593 /* TODO: handle errors */
594 AppendWords(&metaBailiwick, metaBailiwickStr);
595 /*
596 * We ignore any paths that start with ${.MAKE.META.IGNORE_PATHS}
597 */
598 Global_Append(MAKE_META_IGNORE_PATHS,
599 "/dev /etc /proc /tmp /var/run /var/tmp ${TMPDIR}");
600 metaIgnorePathsStr = Var_Subst("${" MAKE_META_IGNORE_PATHS ":O:u:tA}",
601 SCOPE_GLOBAL, VARE_EVAL);
602 /* TODO: handle errors */
603 AppendWords(&metaIgnorePaths, metaIgnorePathsStr);
604
605 /*
606 * We ignore any paths that match ${.MAKE.META.IGNORE_PATTERNS}
607 */
608 metaIgnorePatterns = Var_Exists(SCOPE_GLOBAL, MAKE_META_IGNORE_PATTERNS);
609 metaIgnoreFilter = Var_Exists(SCOPE_GLOBAL, MAKE_META_IGNORE_FILTER);
610 metaCmpFilter = Var_Exists(SCOPE_GLOBAL, MAKE_META_CMP_FILTER);
611 }
612
613 MAKE_INLINE BuildMon *
BM(Job * job)614 BM(Job *job)
615 {
616
617 return job != NULL ? Job_BuildMon(job) : &Mybm;
618 }
619
620 /*
621 * In each case below we allow for job==NULL
622 */
623 void
meta_job_start(Job * job,GNode * gn)624 meta_job_start(Job *job, GNode *gn)
625 {
626 BuildMon *pbm;
627
628 pbm = BM(job);
629 pbm->mfp = meta_create(pbm, gn);
630 #ifdef USE_FILEMON_ONCE
631 /* compat mode we open the filemon dev once per command */
632 if (job == NULL)
633 return;
634 #endif
635 #ifdef USE_FILEMON
636 if (pbm->mfp != NULL && useFilemon) {
637 meta_open_filemon(pbm);
638 } else {
639 pbm->mon_fd = -1;
640 pbm->filemon = NULL;
641 }
642 #endif
643 }
644
645 /*
646 * The child calls this before doing anything.
647 * It does not disturb our state.
648 */
649 void
meta_job_child(Job * job MAKE_ATTR_UNUSED)650 meta_job_child(Job *job MAKE_ATTR_UNUSED)
651 {
652 #ifdef USE_FILEMON
653 BuildMon *pbm;
654
655 pbm = BM(job);
656 if (pbm->mfp != NULL) {
657 close(fileno(pbm->mfp));
658 if (useFilemon && pbm->filemon != NULL) {
659 pid_t pid;
660
661 pid = getpid();
662 if (filemon_setpid_child(pbm->filemon, pid) == -1) {
663 Punt("Could not set filemon pid: %s", strerror(errno));
664 }
665 }
666 }
667 #endif
668 }
669
670 void
meta_job_parent(Job * job MAKE_ATTR_UNUSED,pid_t pid MAKE_ATTR_UNUSED)671 meta_job_parent(Job *job MAKE_ATTR_UNUSED, pid_t pid MAKE_ATTR_UNUSED)
672 {
673 #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV)
674 BuildMon *pbm;
675
676 pbm = BM(job);
677 if (useFilemon && pbm->filemon != NULL) {
678 filemon_setpid_parent(pbm->filemon, pid);
679 }
680 #endif
681 }
682
683 int
meta_job_fd(Job * job MAKE_ATTR_UNUSED)684 meta_job_fd(Job *job MAKE_ATTR_UNUSED)
685 {
686 #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV)
687 BuildMon *pbm;
688
689 pbm = BM(job);
690 if (useFilemon && pbm->filemon != NULL) {
691 return filemon_readfd(pbm->filemon);
692 }
693 #endif
694 return -1;
695 }
696
697 int
meta_job_event(Job * job MAKE_ATTR_UNUSED)698 meta_job_event(Job *job MAKE_ATTR_UNUSED)
699 {
700 #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV)
701 BuildMon *pbm;
702
703 pbm = BM(job);
704 if (useFilemon && pbm->filemon != NULL) {
705 return filemon_process(pbm->filemon);
706 }
707 #endif
708 return 0;
709 }
710
711 void
meta_job_error(Job * job,GNode * gn,bool ignerr,int status)712 meta_job_error(Job *job, GNode *gn, bool ignerr, int status)
713 {
714 char cwd[MAXPATHLEN];
715 BuildMon *pbm;
716
717 pbm = BM(job);
718 if (job != NULL && gn == NULL)
719 gn = Job_Node(job);
720 if (pbm->mfp != NULL) {
721 fprintf(pbm->mfp, "\n*** Error code %d%s\n",
722 status, ignerr ? "(ignored)" : "");
723 }
724 if (gn != NULL)
725 Global_Set(".ERROR_TARGET", GNode_Path(gn));
726 if (getcwd(cwd, sizeof cwd) == NULL)
727 Punt("getcwd: %s", strerror(errno));
728
729 Global_Set(".ERROR_CWD", cwd);
730 if (pbm->meta_fname[0] != '\0') {
731 Global_Set(".ERROR_META_FILE", pbm->meta_fname);
732 }
733 meta_job_finish(job);
734 }
735
736 void
meta_job_output(Job * job,const char * cp,size_t len)737 meta_job_output(Job *job, const char *cp, size_t len)
738 {
739 BuildMon *pbm;
740
741 pbm = BM(job);
742 if (pbm->mfp != NULL) {
743 if (metaVerbose) {
744 static char *meta_prefix = NULL;
745 static size_t meta_prefix_len;
746
747 if (meta_prefix == NULL) {
748 meta_prefix = Var_Subst("${" MAKE_META_PREFIX "}",
749 SCOPE_GLOBAL, VARE_EVAL);
750 /* TODO: handle errors */
751 meta_prefix_len = strcspn(meta_prefix, "$");
752 }
753 if (strncmp(cp, meta_prefix, meta_prefix_len) == 0) {
754 cp = strchr(cp + 1, '\n');
755 if (cp == NULL)
756 return;
757 cp++;
758 }
759 }
760 fprintf(pbm->mfp, "%.*s", (int)len, cp);
761 }
762 }
763
764 int
meta_cmd_finish(void * pbmp)765 meta_cmd_finish(void *pbmp)
766 {
767 int error = 0;
768 BuildMon *pbm = pbmp;
769 #ifdef USE_FILEMON
770 int x;
771 #endif
772
773 if (pbm == NULL)
774 pbm = &Mybm;
775
776 #ifdef USE_FILEMON
777 if (pbm->filemon != NULL) {
778 while (filemon_process(pbm->filemon) > 0)
779 continue;
780 if (filemon_close(pbm->filemon) == -1) {
781 error = errno;
782 Punt("filemon failed: %s", strerror(errno));
783 }
784 x = filemon_read(pbm->mfp, pbm->mon_fd);
785 if (error == 0 && x != 0)
786 error = x;
787 pbm->mon_fd = -1;
788 pbm->filemon = NULL;
789 return error;
790 }
791 #endif
792
793 fprintf(pbm->mfp, "\n"); /* ensure end with newline */
794 return error;
795 }
796
797 int
meta_job_finish(Job * job)798 meta_job_finish(Job *job)
799 {
800 BuildMon *pbm;
801 int error = 0;
802 int x;
803
804 pbm = BM(job);
805 if (pbm->mfp != NULL) {
806 error = meta_cmd_finish(pbm);
807 x = fclose(pbm->mfp);
808 if (error == 0 && x != 0)
809 error = errno;
810 pbm->mfp = NULL;
811 pbm->meta_fname[0] = '\0';
812 }
813 return error;
814 }
815
816 void
meta_finish(void)817 meta_finish(void)
818 {
819 Lst_Done(&metaBailiwick);
820 free(metaBailiwickStr);
821 Lst_Done(&metaIgnorePaths);
822 free(metaIgnorePathsStr);
823 }
824
825 /*
826 * Fetch a full line from fp - growing bufp if needed
827 * Return length in bufp.
828 */
829 static int
fgetLine(char ** bufp,size_t * szp,int o,FILE * fp)830 fgetLine(char **bufp, size_t *szp, int o, FILE *fp)
831 {
832 char *buf = *bufp;
833 size_t bufsz = *szp;
834 struct stat fs;
835 int x;
836
837 if (fgets(&buf[o], (int)bufsz - o, fp) != NULL) {
838 check_newline:
839 x = o + (int)strlen(&buf[o]);
840 if (buf[x - 1] == '\n')
841 return x;
842 /*
843 * We need to grow the buffer.
844 * The meta file can give us a clue.
845 */
846 if (fstat(fileno(fp), &fs) == 0) {
847 size_t newsz;
848 char *p;
849
850 newsz = ROUNDUP(((size_t)fs.st_size / 2), BUFSIZ);
851 if (newsz <= bufsz)
852 newsz = ROUNDUP((size_t)fs.st_size, BUFSIZ);
853 if (newsz <= bufsz)
854 return x; /* truncated */
855 DEBUG2(META, "growing buffer %u -> %u\n",
856 (unsigned)bufsz, (unsigned)newsz);
857 p = bmake_realloc(buf, newsz);
858 *bufp = buf = p;
859 *szp = bufsz = newsz;
860 /* fetch the rest */
861 if (fgets(&buf[x], (int)bufsz - x, fp) == NULL)
862 return x; /* truncated! */
863 goto check_newline;
864 }
865 }
866 return 0;
867 }
868
869 static bool
prefix_match(const char * prefix,const char * path)870 prefix_match(const char *prefix, const char *path)
871 {
872 size_t n = strlen(prefix);
873
874 return strncmp(path, prefix, n) == 0;
875 }
876
877 static bool
has_any_prefix(const char * path,StringList * prefixes)878 has_any_prefix(const char *path, StringList *prefixes)
879 {
880 StringListNode *ln;
881
882 for (ln = prefixes->first; ln != NULL; ln = ln->next)
883 if (prefix_match(ln->datum, path))
884 return true;
885 return false;
886 }
887
888 /* See if the path equals prefix or starts with "prefix/". */
889 static bool
path_starts_with(const char * path,const char * prefix)890 path_starts_with(const char *path, const char *prefix)
891 {
892 size_t n = strlen(prefix);
893
894 if (strncmp(path, prefix, n) != 0)
895 return false;
896 return path[n] == '\0' || path[n] == '/';
897 }
898
899 static bool
meta_ignore(GNode * gn,const char * p)900 meta_ignore(GNode *gn, const char *p)
901 {
902 char fname[MAXPATHLEN];
903
904 if (p == NULL)
905 return true;
906
907 if (*p == '/') {
908 /* first try the raw path "as is" */
909 if (has_any_prefix(p, &metaIgnorePaths)) {
910 #ifdef DEBUG_META_MODE
911 DEBUG1(META, "meta_oodate: ignoring path: %s\n", p);
912 #endif
913 return true;
914 }
915 cached_realpath(p, fname); /* clean it up */
916 if (has_any_prefix(fname, &metaIgnorePaths)) {
917 #ifdef DEBUG_META_MODE
918 DEBUG1(META, "meta_oodate: ignoring path: %s\n", p);
919 #endif
920 return true;
921 }
922 }
923
924 if (metaIgnorePatterns) {
925 const char *expr;
926 char *pm;
927
928 /*
929 * XXX: This variable is set on a target GNode but is not one of
930 * the usual local variables. It should be deleted afterwards.
931 * Ideally it would not be created in the first place, just like
932 * in a .for loop.
933 */
934 Var_Set(gn, ".p.", p);
935 expr = "${" MAKE_META_IGNORE_PATTERNS ":@m@${.p.:M$m}@}";
936 pm = Var_Subst(expr, gn, VARE_EVAL);
937 /* TODO: handle errors */
938 if (pm[0] != '\0') {
939 #ifdef DEBUG_META_MODE
940 DEBUG1(META, "meta_oodate: ignoring pattern: %s\n", p);
941 #endif
942 free(pm);
943 return true;
944 }
945 free(pm);
946 }
947
948 if (metaIgnoreFilter) {
949 char *fm;
950
951 /* skip if filter result is empty */
952 snprintf(fname, sizeof fname,
953 "${%s:L:${%s:ts:}}",
954 p, MAKE_META_IGNORE_FILTER);
955 fm = Var_Subst(fname, gn, VARE_EVAL);
956 /* TODO: handle errors */
957 if (*fm == '\0') {
958 #ifdef DEBUG_META_MODE
959 DEBUG1(META, "meta_oodate: ignoring filtered: %s\n", p);
960 #endif
961 free(fm);
962 return true;
963 }
964 free(fm);
965 }
966 return false;
967 }
968
969 /*
970 * When running with 'meta' functionality, a target can be out-of-date
971 * if any of the references in its meta data file is more recent.
972 * We have to track the latestdir on a per-process basis.
973 */
974 #define LCWD_VNAME_FMT ".meta.%d.lcwd"
975 #define LDIR_VNAME_FMT ".meta.%d.ldir"
976
977 /*
978 * It is possible that a .meta file is corrupted,
979 * if we detect this we want to reproduce it.
980 * Setting oodate true will have that effect.
981 */
982 #define CHECK_VALID_META(p) if (!(p != NULL && *p != '\0')) { \
983 warnx("%s:%u: malformed", fname, lineno); \
984 oodate = true; \
985 continue; \
986 }
987
988 #define DEQUOTE(p) if (*p == '\'') { \
989 char *ep; \
990 p++; \
991 if ((ep = strchr(p, '\'')) != NULL) \
992 *ep = '\0'; \
993 }
994
995 static void
append_if_new(StringList * list,const char * str)996 append_if_new(StringList *list, const char *str)
997 {
998 StringListNode *ln;
999
1000 for (ln = list->first; ln != NULL; ln = ln->next)
1001 if (strcmp(ln->datum, str) == 0)
1002 return;
1003 Lst_Append(list, bmake_strdup(str));
1004 }
1005
1006 /* A "reserved" variable to store the command to be filtered */
1007 #define META_CMD_FILTER_VAR ".MAKE.cmd_filtered"
1008
1009 static char *
meta_filter_cmd(GNode * gn,char * s)1010 meta_filter_cmd(GNode *gn, char *s)
1011 {
1012 Var_Set(gn, META_CMD_FILTER_VAR, s);
1013 s = Var_Subst(
1014 "${" META_CMD_FILTER_VAR ":${" MAKE_META_CMP_FILTER ":ts:}}",
1015 gn, VARE_EVAL);
1016 return s;
1017 }
1018
1019 static int
meta_cmd_cmp(GNode * gn,char * a,char * b,bool filter)1020 meta_cmd_cmp(GNode *gn, char *a, char *b, bool filter)
1021 {
1022 int rc;
1023
1024 rc = strcmp(a, b);
1025 if (rc == 0 || !filter)
1026 return rc;
1027 a = meta_filter_cmd(gn, a);
1028 b = meta_filter_cmd(gn, b);
1029 rc = strcmp(a, b);
1030 free(a);
1031 free(b);
1032 Var_Delete(gn, META_CMD_FILTER_VAR);
1033 return rc;
1034 }
1035
1036 bool
meta_oodate(GNode * gn,bool oodate)1037 meta_oodate(GNode *gn, bool oodate)
1038 {
1039 static char *tmpdir = NULL;
1040 static char cwd[MAXPATHLEN];
1041 char lcwd_vname[64];
1042 char ldir_vname[64];
1043 char lcwd[MAXPATHLEN];
1044 char latestdir[MAXPATHLEN];
1045 char fname[MAXPATHLEN];
1046 char fname1[MAXPATHLEN];
1047 char fname2[MAXPATHLEN];
1048 char fname3[MAXPATHLEN];
1049 FStr dname;
1050 const char *tname;
1051 char *p;
1052 char *link_src;
1053 char *move_target;
1054 static size_t cwdlen = 0;
1055 static size_t tmplen = 0;
1056 FILE *fp;
1057 bool needOODATE = false;
1058 StringList missingFiles;
1059 bool have_filemon = false;
1060 bool cmp_filter;
1061
1062 if (oodate)
1063 return oodate; /* we're done */
1064
1065 dname = Var_Value(gn, ".OBJDIR");
1066 tname = GNode_VarTarget(gn);
1067
1068 /* if this succeeds fname3 is realpath of dname */
1069 if (!meta_needed(gn, dname.str, fname3, false))
1070 goto oodate_out;
1071 dname.str = fname3;
1072
1073 Lst_Init(&missingFiles);
1074
1075 /*
1076 * We need to check if the target is out-of-date. This includes
1077 * checking if the expanded command has changed. This in turn
1078 * requires that all variables are set in the same way that they
1079 * would be if the target needs to be re-built.
1080 */
1081 GNode_SetLocalVars(gn);
1082
1083 meta_name(fname, sizeof fname, dname.str, tname, dname.str);
1084
1085 #ifdef DEBUG_META_MODE
1086 DEBUG1(META, "meta_oodate: %s\n", fname);
1087 #endif
1088
1089 if ((fp = fopen(fname, "r")) != NULL) {
1090 static char *buf = NULL;
1091 static size_t bufsz;
1092 unsigned lineno = 0;
1093 int lastpid = 0;
1094 int pid;
1095 int x;
1096 StringListNode *cmdNode;
1097 struct cached_stat cst;
1098
1099 if (buf == NULL) {
1100 bufsz = 8 * BUFSIZ;
1101 buf = bmake_malloc(bufsz);
1102 }
1103
1104 if (cwdlen == 0) {
1105 if (getcwd(cwd, sizeof cwd) == NULL)
1106 err(1, "Could not get current working directory");
1107 cwdlen = strlen(cwd);
1108 }
1109 strlcpy(lcwd, cwd, sizeof lcwd);
1110 strlcpy(latestdir, cwd, sizeof latestdir);
1111
1112 if (tmpdir == NULL) {
1113 tmpdir = getTmpdir();
1114 tmplen = strlen(tmpdir);
1115 }
1116
1117 /* we want to track all the .meta we read */
1118 Global_Append(".MAKE.META.FILES", fname);
1119
1120 cmp_filter = metaCmpFilter || Var_Exists(gn, MAKE_META_CMP_FILTER);
1121
1122 cmdNode = gn->commands.first;
1123 while (!oodate && (x = fgetLine(&buf, &bufsz, 0, fp)) > 0) {
1124 lineno++;
1125 if (buf[x - 1] == '\n')
1126 buf[x - 1] = '\0';
1127 else {
1128 warnx("%s:%u: line truncated at %u", fname, lineno, x);
1129 oodate = true;
1130 break;
1131 }
1132 link_src = NULL;
1133 move_target = NULL;
1134 /* Find the start of the build monitor section. */
1135 if (!have_filemon) {
1136 if (strncmp(buf, "-- filemon", 10) == 0) {
1137 have_filemon = true;
1138 continue;
1139 }
1140 if (strncmp(buf, "# buildmon", 10) == 0) {
1141 have_filemon = true;
1142 continue;
1143 }
1144 }
1145
1146 /* Delimit the record type. */
1147 p = buf;
1148 #ifdef DEBUG_META_MODE
1149 DEBUG3(META, "%s:%u: %s\n", fname, lineno, buf);
1150 #endif
1151 strsep(&p, " ");
1152 if (have_filemon) {
1153 /*
1154 * We are in the 'filemon' output section.
1155 * Each record from filemon follows the general form:
1156 *
1157 * <key> <pid> <data>
1158 *
1159 * Where:
1160 * <key> is a single letter, denoting the syscall.
1161 * <pid> is the process that made the syscall.
1162 * <data> is the arguments (of interest).
1163 */
1164 switch(buf[0]) {
1165 case '#': /* comment */
1166 case 'V': /* version */
1167 break;
1168 default:
1169 /*
1170 * We need to track pathnames per-process.
1171 *
1172 * Each process run by make starts off in the 'CWD'
1173 * recorded in the .meta file, if it chdirs ('C')
1174 * elsewhere we need to track that - but only for
1175 * that process. If it forks ('F'), we initialize
1176 * the child to have the same cwd as its parent.
1177 *
1178 * We also need to track the 'latestdir' of
1179 * interest. This is usually the same as cwd, but
1180 * not if a process is reading directories.
1181 *
1182 * Each time we spot a different process ('pid')
1183 * we save the current value of 'latestdir' in a
1184 * variable qualified by 'lastpid', and
1185 * re-initialize 'latestdir' to any pre-saved
1186 * value for the current 'pid' and 'CWD' if none.
1187 */
1188 CHECK_VALID_META(p);
1189 pid = atoi(p);
1190 if (pid > 0 && pid != lastpid) {
1191 FStr ldir;
1192
1193 if (lastpid > 0) {
1194 /* We need to remember these. */
1195 Global_Set(lcwd_vname, lcwd);
1196 Global_Set(ldir_vname, latestdir);
1197 }
1198 snprintf(lcwd_vname, sizeof lcwd_vname, LCWD_VNAME_FMT, pid);
1199 snprintf(ldir_vname, sizeof ldir_vname, LDIR_VNAME_FMT, pid);
1200 lastpid = pid;
1201 ldir = Var_Value(SCOPE_GLOBAL, ldir_vname);
1202 if (ldir.str != NULL) {
1203 strlcpy(latestdir, ldir.str, sizeof latestdir);
1204 FStr_Done(&ldir);
1205 }
1206 ldir = Var_Value(SCOPE_GLOBAL, lcwd_vname);
1207 if (ldir.str != NULL) {
1208 strlcpy(lcwd, ldir.str, sizeof lcwd);
1209 FStr_Done(&ldir);
1210 }
1211 }
1212 /* Skip past the pid. */
1213 if (strsep(&p, " ") == NULL)
1214 continue;
1215 #ifdef DEBUG_META_MODE
1216 if (DEBUG(META))
1217 debug_printf("%s:%u: %d: %c: cwd=%s lcwd=%s ldir=%s\n",
1218 fname, lineno,
1219 pid, buf[0], cwd, lcwd, latestdir);
1220 #endif
1221 break;
1222 }
1223
1224 CHECK_VALID_META(p);
1225
1226 /* Process according to record type. */
1227 switch (buf[0]) {
1228 case 'X': /* eXit */
1229 Var_Delete(SCOPE_GLOBAL, lcwd_vname);
1230 Var_Delete(SCOPE_GLOBAL, ldir_vname);
1231 lastpid = 0; /* no need to save ldir_vname */
1232 break;
1233
1234 case 'F': /* [v]Fork */
1235 {
1236 char cldir[64];
1237 int child;
1238
1239 child = atoi(p);
1240 if (child > 0) {
1241 snprintf(cldir, sizeof cldir, LCWD_VNAME_FMT, child);
1242 Global_Set(cldir, lcwd);
1243 snprintf(cldir, sizeof cldir, LDIR_VNAME_FMT, child);
1244 Global_Set(cldir, latestdir);
1245 #ifdef DEBUG_META_MODE
1246 if (DEBUG(META))
1247 debug_printf(
1248 "%s:%u: %d: cwd=%s lcwd=%s ldir=%s\n",
1249 fname, lineno,
1250 child, cwd, lcwd, latestdir);
1251 #endif
1252 }
1253 }
1254 break;
1255
1256 case 'C': /* Chdir */
1257 /* Update lcwd and latest directory. */
1258 strlcpy(latestdir, p, sizeof latestdir);
1259 strlcpy(lcwd, p, sizeof lcwd);
1260 Global_Set(lcwd_vname, lcwd);
1261 Global_Set(ldir_vname, lcwd);
1262 #ifdef DEBUG_META_MODE
1263 DEBUG4(META, "%s:%u: cwd=%s ldir=%s\n",
1264 fname, lineno, cwd, lcwd);
1265 #endif
1266 break;
1267
1268 case 'M': /* renaMe */
1269 /*
1270 * For 'M'oves we want to check
1271 * the src as for 'R'ead
1272 * and the target as for 'W'rite.
1273 */
1274 {
1275 char *cp = p; /* save this for a second */
1276 /* now get target */
1277 if (strsep(&p, " ") == NULL)
1278 continue;
1279 CHECK_VALID_META(p);
1280 move_target = p;
1281 p = cp;
1282 }
1283 /* 'L' and 'M' put single quotes around the args */
1284 DEQUOTE(p);
1285 DEQUOTE(move_target);
1286 /* FALLTHROUGH */
1287 case 'D': /* unlink */
1288 if (*p == '/') {
1289 /* remove any missingFiles entries that match p */
1290 StringListNode *ln = missingFiles.first;
1291 while (ln != NULL) {
1292 StringListNode *next = ln->next;
1293 if (path_starts_with(ln->datum, p)) {
1294 free(ln->datum);
1295 Lst_Remove(&missingFiles, ln);
1296 }
1297 ln = next;
1298 }
1299 }
1300 if (buf[0] == 'M') {
1301 /* the target of the mv is a file 'W'ritten */
1302 #ifdef DEBUG_META_MODE
1303 DEBUG2(META, "meta_oodate: M %s -> %s\n",
1304 p, move_target);
1305 #endif
1306 p = move_target;
1307 goto check_write;
1308 }
1309 break;
1310 case 'L': /* Link */
1311 /*
1312 * For 'L'inks check
1313 * the src as for 'R'ead
1314 * and the target as for 'W'rite.
1315 */
1316 link_src = p;
1317 /* now get target */
1318 if (strsep(&p, " ") == NULL)
1319 continue;
1320 CHECK_VALID_META(p);
1321 /* 'L' and 'M' put single quotes around the args */
1322 DEQUOTE(p);
1323 DEQUOTE(link_src);
1324 #ifdef DEBUG_META_MODE
1325 DEBUG2(META, "meta_oodate: L %s -> %s\n", 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 (!has_any_prefix(p, &metaBailiwick))
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 /* XXX: The arguments to strstr must be swapped. */
1355 if (strstr("tmp", p) != NULL)
1356 break;
1357
1358 if ((link_src != NULL && cached_lstat(p, &cst) < 0) ||
1359 (link_src == NULL && cached_stat(p, &cst) < 0)) {
1360 if (!meta_ignore(gn, p))
1361 append_if_new(&missingFiles, p);
1362 }
1363 break;
1364 check_link_src:
1365 p = link_src;
1366 link_src = NULL;
1367 #ifdef DEBUG_META_MODE
1368 DEBUG1(META, "meta_oodate: L src %s\n", p);
1369 #endif
1370 /* FALLTHROUGH */
1371 case 'R': /* Read */
1372 case 'E': /* Exec */
1373 /*
1374 * Check for runtime files that can't
1375 * be part of the dependencies because
1376 * they are _expected_ to change.
1377 */
1378 if (meta_ignore(gn, p))
1379 break;
1380
1381 /*
1382 * The rest of the record is the file name.
1383 * Check if it's not an absolute path.
1384 */
1385 {
1386 char *sdirs[4];
1387 char **sdp;
1388 int sdx = 0;
1389 bool found = false;
1390
1391 if (*p == '/') {
1392 sdirs[sdx++] = p; /* done */
1393 } else {
1394 if (strcmp(".", p) == 0)
1395 continue; /* no point */
1396
1397 /* Check vs latestdir */
1398 if (snprintf(fname1, sizeof fname1, "%s/%s", latestdir, p) < (int)(sizeof fname1))
1399 sdirs[sdx++] = fname1;
1400
1401 if (strcmp(latestdir, lcwd) != 0) {
1402 /* Check vs lcwd */
1403 if (snprintf(fname2, sizeof fname2, "%s/%s", lcwd, p) < (int)(sizeof fname2))
1404 sdirs[sdx++] = fname2;
1405 }
1406 if (strcmp(lcwd, cwd) != 0) {
1407 /* Check vs cwd */
1408 if (snprintf(fname3, sizeof fname3, "%s/%s", cwd, p) < (int)(sizeof fname3))
1409 sdirs[sdx++] = fname3;
1410 }
1411 }
1412 sdirs[sdx++] = NULL;
1413
1414 for (sdp = sdirs; *sdp != NULL && !found; sdp++) {
1415 #ifdef DEBUG_META_MODE
1416 DEBUG3(META, "%s:%u: looking for: %s\n",
1417 fname, lineno, *sdp);
1418 #endif
1419 if (cached_stat(*sdp, &cst) == 0) {
1420 found = true;
1421 p = *sdp;
1422 }
1423 }
1424 if (found) {
1425 #ifdef DEBUG_META_MODE
1426 DEBUG3(META, "%s:%u: found: %s\n",
1427 fname, lineno, p);
1428 #endif
1429 if (!S_ISDIR(cst.cst_mode) &&
1430 cst.cst_mtime > gn->mtime) {
1431 DEBUG3(META, "%s:%u: file '%s' is newer than the target...\n",
1432 fname, lineno, p);
1433 oodate = true;
1434 } else if (S_ISDIR(cst.cst_mode)) {
1435 /* Update the latest directory. */
1436 cached_realpath(p, latestdir);
1437 }
1438 } else if (errno == ENOENT && *p == '/' &&
1439 strncmp(p, cwd, cwdlen) != 0) {
1440 /*
1441 * A referenced file outside of CWD is missing.
1442 * We cannot catch every eventuality here...
1443 */
1444 append_if_new(&missingFiles, p);
1445 }
1446 }
1447 if (buf[0] == 'E') {
1448 /* previous latestdir is no longer relevant */
1449 strlcpy(latestdir, lcwd, sizeof latestdir);
1450 }
1451 break;
1452 default:
1453 break;
1454 }
1455 if (!oodate && buf[0] == 'L' && link_src != NULL)
1456 goto check_link_src;
1457 } else if (strcmp(buf, "CMD") == 0) {
1458 /*
1459 * Compare the current command with the one in the
1460 * meta data file.
1461 */
1462 if (cmdNode == NULL) {
1463 DEBUG2(META, "%s:%u: there were more build commands in the meta data file than there are now...\n",
1464 fname, lineno);
1465 oodate = true;
1466 } else {
1467 const char *cp;
1468 char *cmd = cmdNode->datum;
1469 bool hasOODATE = false;
1470
1471 if (strstr(cmd, "$?") != NULL)
1472 hasOODATE = true;
1473 else if ((cp = strstr(cmd, ".OODATE")) != NULL) {
1474 /* check for $[{(].OODATE[:)}] */
1475 if (cp > cmd + 2 && cp[-2] == '$')
1476 hasOODATE = true;
1477 }
1478 if (hasOODATE) {
1479 needOODATE = true;
1480 DEBUG2(META, "%s:%u: cannot compare command using .OODATE\n",
1481 fname, lineno);
1482 }
1483 cmd = Var_Subst(cmd, gn, VARE_EVAL_DEFINED);
1484 /* TODO: handle errors */
1485
1486 if ((cp = strchr(cmd, '\n')) != NULL) {
1487 int n;
1488
1489 /*
1490 * This command contains newlines, we need to
1491 * fetch more from the .meta file before we
1492 * attempt a comparison.
1493 */
1494 /* first put the newline back at buf[x - 1] */
1495 buf[x - 1] = '\n';
1496 do {
1497 /* now fetch the next line */
1498 if ((n = fgetLine(&buf, &bufsz, x, fp)) <= 0)
1499 break;
1500 x = n;
1501 lineno++;
1502 if (buf[x - 1] != '\n') {
1503 warnx("%s:%u: line truncated at %u", fname, lineno, x);
1504 break;
1505 }
1506 cp = strchr(cp + 1, '\n');
1507 } while (cp != NULL);
1508 if (buf[x - 1] == '\n')
1509 buf[x - 1] = '\0';
1510 }
1511 if (p != NULL &&
1512 !hasOODATE &&
1513 !(gn->type & OP_NOMETA_CMP) &&
1514 (meta_cmd_cmp(gn, p, cmd, cmp_filter) != 0)) {
1515 DEBUG4(META, "%s:%u: a build command has changed\n%s\nvs\n%s\n",
1516 fname, lineno, p, cmd);
1517 if (!metaIgnoreCMDs)
1518 oodate = true;
1519 }
1520 free(cmd);
1521 cmdNode = cmdNode->next;
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 && cmdNode != NULL) {
1529 DEBUG2(META, "%s:%u: there are extra build commands now that weren't in the meta data file\n",
1530 fname, lineno);
1531 oodate = true;
1532 }
1533 CHECK_VALID_META(p);
1534 if (strcmp(p, cwd) != 0) {
1535 DEBUG4(META, "%s:%u: the current working directory has changed from '%s' to '%s'\n",
1536 fname, lineno, p, curdir);
1537 oodate = true;
1538 }
1539 }
1540 }
1541
1542 fclose(fp);
1543 if (!Lst_IsEmpty(&missingFiles)) {
1544 DEBUG2(META, "%s: missing files: %s...\n",
1545 fname, (char *)missingFiles.first->datum);
1546 oodate = true;
1547 }
1548 if (!oodate && !have_filemon && filemonMissing) {
1549 DEBUG1(META, "%s: missing filemon data\n", fname);
1550 oodate = true;
1551 }
1552 } else {
1553 if (writeMeta && (metaMissing || (gn->type & OP_META))) {
1554 const char *cp = NULL;
1555
1556 /* if target is in .CURDIR we do not need a meta file */
1557 if (gn->path != NULL && (cp = strrchr(gn->path, '/')) != NULL &&
1558 (cp > gn->path)) {
1559 if (strncmp(curdir, gn->path, (size_t)(cp - gn->path)) != 0) {
1560 cp = NULL; /* not in .CURDIR */
1561 }
1562 }
1563 if (cp == NULL) {
1564 DEBUG1(META, "%s: required but missing\n", fname);
1565 oodate = true;
1566 needOODATE = true; /* assume the worst */
1567 }
1568 }
1569 }
1570
1571 Lst_DoneFree(&missingFiles);
1572
1573 if (oodate && needOODATE) {
1574 /*
1575 * Target uses .OODATE which is empty; or we wouldn't be here.
1576 * We have decided it is oodate, so .OODATE needs to be set.
1577 * All we can sanely do is set it to .ALLSRC.
1578 */
1579 Var_Delete(gn, OODATE);
1580 Var_Set(gn, OODATE, GNode_VarAllsrc(gn));
1581 }
1582
1583 oodate_out:
1584 FStr_Done(&dname);
1585 return oodate;
1586 }
1587
1588 /* support for compat mode */
1589
1590 static int childPipe[2];
1591
1592 void
meta_compat_start(void)1593 meta_compat_start(void)
1594 {
1595 #ifdef USE_FILEMON_ONCE
1596 /*
1597 * We need to re-open filemon for each cmd.
1598 */
1599 BuildMon *pbm = &Mybm;
1600
1601 if (pbm->mfp != NULL && useFilemon) {
1602 meta_open_filemon(pbm);
1603 } else {
1604 pbm->mon_fd = -1;
1605 pbm->filemon = NULL;
1606 }
1607 #endif
1608 if (pipe(childPipe) < 0)
1609 Punt("pipe: %s", strerror(errno));
1610 /* Set close-on-exec flag for both */
1611 (void)fcntl(childPipe[0], F_SETFD, FD_CLOEXEC);
1612 (void)fcntl(childPipe[1], F_SETFD, FD_CLOEXEC);
1613 }
1614
1615 void
meta_compat_child(void)1616 meta_compat_child(void)
1617 {
1618 meta_job_child(NULL);
1619 if (dup2(childPipe[1], STDOUT_FILENO) < 0
1620 || dup2(STDOUT_FILENO, STDERR_FILENO) < 0)
1621 execDie("dup2", "pipe");
1622 }
1623
1624 void
meta_compat_parent(pid_t child)1625 meta_compat_parent(pid_t child)
1626 {
1627 int outfd, metafd, maxfd, nfds;
1628 char buf[BUFSIZ+1];
1629 fd_set readfds;
1630
1631 meta_job_parent(NULL, child);
1632 close(childPipe[1]); /* child side */
1633 outfd = childPipe[0];
1634 #ifdef USE_FILEMON
1635 metafd = Mybm.filemon != NULL ? filemon_readfd(Mybm.filemon) : -1;
1636 #else
1637 metafd = -1;
1638 #endif
1639 maxfd = -1;
1640 if (outfd > maxfd)
1641 maxfd = outfd;
1642 if (metafd > maxfd)
1643 maxfd = metafd;
1644
1645 while (outfd != -1 || metafd != -1) {
1646 FD_ZERO(&readfds);
1647 if (outfd != -1) {
1648 FD_SET(outfd, &readfds);
1649 }
1650 if (metafd != -1) {
1651 FD_SET(metafd, &readfds);
1652 }
1653 nfds = select(maxfd + 1, &readfds, NULL, NULL, NULL);
1654 if (nfds == -1) {
1655 if (errno == EINTR)
1656 continue;
1657 err(1, "select");
1658 }
1659
1660 if (outfd != -1 && FD_ISSET(outfd, &readfds) != 0) do {
1661 /* XXX this is not line-buffered */
1662 ssize_t nread = read(outfd, buf, sizeof buf - 1);
1663 if (nread == -1)
1664 err(1, "read");
1665 if (nread == 0) {
1666 close(outfd);
1667 outfd = -1;
1668 break;
1669 }
1670 fwrite(buf, 1, (size_t)nread, stdout);
1671 fflush(stdout);
1672 buf[nread] = '\0';
1673 meta_job_output(NULL, buf, (size_t)nread);
1674 } while (false);
1675 if (metafd != -1 && FD_ISSET(metafd, &readfds) != 0) {
1676 if (meta_job_event(NULL) <= 0)
1677 metafd = -1;
1678 }
1679 }
1680 }
1681
1682 #endif /* USE_META */
1683