1 /* $NetBSD: meta.c,v 1.36 2014/11/06 01:36:57 sjg Exp $ */
4 * Implement 'meta' mode.
5 * Adapted from John Birrell's patches to FreeBSD make.
9 * Copyright (c) 2009-2010, Juniper Networks, Inc.
10 * Portions Copyright (c) 2009, John Birrell.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
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.
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.
39 #include <sys/ioctl.h>
43 #if !defined(HAVE_CONFIG_H) || defined(HAVE_ERR_H)
53 #if !defined(USE_FILEMON) && defined(FILEMON_SET_FD)
57 static BuildMon Mybm; /* for compat */
58 static Lst metaBailiwick; /* our scope of control */
59 static Lst metaIgnorePaths; /* paths we deliberately ignore */
61 #ifndef MAKE_META_IGNORE_PATHS
62 #define MAKE_META_IGNORE_PATHS ".MAKE.META.IGNORE_PATHS"
65 Boolean useMeta = FALSE;
66 static Boolean useFilemon = FALSE;
67 static Boolean writeMeta = FALSE;
68 static Boolean metaEnv = FALSE; /* don't save env unless asked */
69 static Boolean metaVerbose = FALSE;
70 static Boolean metaIgnoreCMDs = FALSE; /* ignore CMDs in .meta files */
71 static Boolean metaCurdirOk = FALSE; /* write .meta in .CURDIR Ok? */
72 static Boolean metaSilent = FALSE; /* if we have a .meta be SILENT */
74 extern Boolean forceJobs;
75 extern Boolean comatMake;
76 extern char **environ;
78 #define MAKE_META_PREFIX ".MAKE.META.PREFIX"
81 # define N2U(n, u) (((n) + ((u) - 1)) / (u))
84 # define ROUNDUP(n, u) (N2U((n), (u)) * (u))
87 #if !defined(HAVE_STRSEP)
88 # define strsep(s, d) stresep((s), (d), 0)
92 * Filemon is a kernel module which snoops certain syscalls.
103 * See meta_oodate below - we mainly care about 'E' and 'R'.
105 * We can still use meta mode without filemon, but
106 * the benefits are more limited.
109 # ifndef _PATH_FILEMON
110 # define _PATH_FILEMON "/dev/filemon"
114 * Open the filemon device.
117 filemon_open(BuildMon *pbm)
121 pbm->mon_fd = pbm->filemon_fd = -1;
125 for (retry = 5; retry >= 0; retry--) {
126 if ((pbm->filemon_fd = open(_PATH_FILEMON, O_RDWR)) >= 0)
130 if (pbm->filemon_fd < 0) {
132 warn("Could not open %s", _PATH_FILEMON);
137 * We use a file outside of '.'
138 * to avoid a FreeBSD kernel bug where unlink invalidates
139 * cwd causing getcwd to do a lot more work.
140 * We only care about the descriptor.
142 pbm->mon_fd = mkTempFile("filemon.XXXXXX", NULL);
143 if (ioctl(pbm->filemon_fd, FILEMON_SET_FD, &pbm->mon_fd) < 0) {
144 err(1, "Could not set filemon file descriptor!");
146 /* we don't need these once we exec */
147 (void)fcntl(pbm->mon_fd, F_SETFD, 1);
148 (void)fcntl(pbm->filemon_fd, F_SETFD, 1);
152 * Read the build monitor output file and write records to the target's
156 filemon_read(FILE *mfp, int fd)
161 /* Check if we're not writing to a meta data file.*/
164 close(fd); /* not interested */
168 (void)lseek(fd, (off_t)0, SEEK_SET);
170 fprintf(mfp, "\n-- filemon acquired metadata --\n");
172 while ((n = read(fd, buf, sizeof(buf))) > 0) {
173 fwrite(buf, 1, n, mfp);
181 * when realpath() fails,
182 * we use this, to clean up ./ and ../
185 eat_dots(char *buf, size_t bufsz, int dots)
206 cp = strstr(buf, eat);
209 if (dots == 2 && cp > buf) {
212 } while (cp > buf && *cp != '/');
215 strlcpy(cp, cp2, bufsz - (cp - buf));
217 return; /* can't happen? */
224 meta_name(struct GNode *gn, char *mname, size_t mnamelen,
228 char buf[MAXPATHLEN];
229 char cwd[MAXPATHLEN];
233 char *p[4]; /* >= number of possible uses */
238 dname = Var_Value(".OBJDIR", gn, &p[i++]);
240 tname = Var_Value(TARGET, gn, &p[i++]);
242 if (realpath(dname, cwd))
246 * Weed out relative paths from the target file name.
247 * We have to be careful though since if target is a
248 * symlink, the result will be unstable.
249 * So we use realpath() just to get the dirname, and leave the
250 * basename as given to us.
252 if ((cp = strrchr(tname, '/'))) {
253 if (realpath(tname, buf)) {
254 if ((rp = strrchr(buf, '/'))) {
257 if (strcmp(cp, rp) != 0)
258 strlcpy(rp, cp, sizeof(buf) - (rp - buf));
263 * We likely have a directory which is about to be made.
264 * We pretend realpath() succeeded, to have a chance
265 * of generating the same meta file name that we will
268 if (tname[0] == '/') {
269 strlcpy(buf, tname, sizeof(buf));
271 snprintf(buf, sizeof(buf), "%s/%s", cwd, tname);
273 eat_dots(buf, sizeof(buf), 1); /* ./ */
274 eat_dots(buf, sizeof(buf), 2); /* ../ */
278 /* on some systems dirname may modify its arg */
279 tp = bmake_strdup(tname);
280 if (strcmp(dname, dirname(tp)) == 0)
281 snprintf(mname, mnamelen, "%s.meta", tname);
283 snprintf(mname, mnamelen, "%s/%s.meta", dname, tname);
286 * Replace path separators in the file name after the
287 * current object directory path.
289 cp = mname + strlen(dname) + 1;
291 while (*cp != '\0') {
298 for (i--; i >= 0; i--) {
306 * Return true if running ${.MAKE}
307 * Bypassed if target is flagged .MAKE
310 is_submake(void *cmdp, void *gnp)
312 static char *p_make = NULL;
319 int rc = 0; /* keep looking */
322 p_make = Var_Value(".MAKE", gn, &cp);
323 p_len = strlen(p_make);
325 cp = strchr(cmd, '$');
327 mp = Var_Subst(NULL, cmd, gn, FALSE);
330 cp2 = strstr(cmd, p_make);
332 switch (cp2[p_len]) {
340 if (cp2 > cmd && rc > 0) {
347 rc = 0; /* no match */
357 typedef struct meta_file_s {
363 printCMD(void *cmdp, void *mfpp)
365 meta_file_t *mfp = mfpp;
369 if (strchr(cmd, '$')) {
370 cmd = cp = Var_Subst(NULL, cmd, mfp->gn, FALSE);
372 fprintf(mfp->fp, "CMD %s\n", cmd);
379 * Certain node types never get a .meta file
381 #define SKIP_META_TYPE(_type) do { \
382 if ((gn->type & __CONCAT(OP_, _type))) { \
384 fprintf(debug_file, "Skipping meta for %s: .%s\n", \
385 gn->name, __STRING(_type)); \
392 meta_create(BuildMon *pbm, GNode *gn)
395 char buf[MAXPATHLEN];
396 char objdir[MAXPATHLEN];
402 char *p[4]; /* >= possible uses */
407 /* This may be a phony node which we don't want meta data for... */
408 /* Skip .meta for .BEGIN, .END, .ERROR etc as well. */
409 /* Or it may be explicitly flagged as .NOMETA */
410 SKIP_META_TYPE(NOMETA);
411 /* Unless it is explicitly flagged as .META */
412 if (!(gn->type & OP_META)) {
413 SKIP_META_TYPE(PHONY);
414 SKIP_META_TYPE(SPECIAL);
415 SKIP_META_TYPE(MAKE);
422 dname = Var_Value(".OBJDIR", gn, &p[i++]);
423 tname = Var_Value(TARGET, gn, &p[i++]);
425 /* The object directory may not exist. Check it.. */
426 if (stat(dname, &fs) != 0) {
428 fprintf(debug_file, "Skipping meta for %s: no .OBJDIR\n",
432 /* Check if there are no commands to execute. */
433 if (Lst_IsEmpty(gn->commands)) {
435 fprintf(debug_file, "Skipping meta for %s: no commands\n",
440 /* make sure these are canonical */
441 if (realpath(dname, objdir))
444 /* If we aren't in the object directory, don't create a meta file. */
445 if (!metaCurdirOk && strcmp(curdir, dname) == 0) {
447 fprintf(debug_file, "Skipping meta for %s: .OBJDIR == .CURDIR\n",
451 if (!(gn->type & OP_META)) {
452 /* We do not generate .meta files for sub-makes */
453 if (Lst_ForEach(gn->commands, is_submake, gn)) {
455 fprintf(debug_file, "Skipping meta for %s: .MAKE\n",
464 /* Describe the target we are building */
465 mp = Var_Subst(NULL, "${" MAKE_META_PREFIX "}", gn, 0);
467 fprintf(stdout, "%s\n", mp);
470 /* Get the basename of the target */
471 if ((cp = strrchr(tname, '/')) == NULL) {
479 if (strcmp(cp, makeDependfile) == 0)
483 /* Don't create meta data. */
486 fname = meta_name(gn, pbm->meta_fname, sizeof(pbm->meta_fname),
489 #ifdef DEBUG_META_MODE
491 fprintf(debug_file, "meta_create: %s\n", fname);
494 if ((mf.fp = fopen(fname, "w")) == NULL)
495 err(1, "Could not open meta file '%s'", fname);
497 fprintf(mf.fp, "# Meta data file %s\n", fname);
501 Lst_ForEach(gn->commands, printCMD, &mf);
503 fprintf(mf.fp, "CWD %s\n", getcwd(buf, sizeof(buf)));
504 fprintf(mf.fp, "TARGET %s\n", tname);
507 for (ptr = environ; *ptr != NULL; ptr++)
508 fprintf(mf.fp, "ENV %s\n", *ptr);
511 fprintf(mf.fp, "-- command output --\n");
514 Var_Append(".MAKE.META.FILES", fname, VAR_GLOBAL);
515 Var_Append(".MAKE.META.CREATED", fname, VAR_GLOBAL);
517 gn->type |= OP_META; /* in case anyone wants to know */
519 gn->type |= OP_SILENT;
522 for (i--; i >= 0; i--) {
545 * Initialization we need before reading makefiles.
551 /* this allows makefiles to test if we have filemon support */
552 Var_Set(".MAKE.PATH_FILEMON", _PATH_FILEMON, VAR_GLOBAL, 0);
558 * Initialization we need after reading makefiles.
561 meta_mode_init(const char *make_mode)
571 if (strstr(make_mode, "env"))
573 if (strstr(make_mode, "verb"))
575 if (strstr(make_mode, "read"))
577 if (strstr(make_mode, "nofilemon"))
579 if ((cp = strstr(make_mode, "curdirok="))) {
580 metaCurdirOk = boolValue(&cp[9]);
582 if ((cp = strstr(make_mode, "silent="))) {
583 metaSilent = boolValue(&cp[7]);
585 if (strstr(make_mode, "ignore-cmd"))
586 metaIgnoreCMDs = TRUE;
587 /* for backwards compatability */
588 Var_Set(".MAKE.META_CREATED", "${.MAKE.META.CREATED}", VAR_GLOBAL, 0);
589 Var_Set(".MAKE.META_FILES", "${.MAKE.META.FILES}", VAR_GLOBAL, 0);
591 if (metaVerbose && !Var_Exists(MAKE_META_PREFIX, VAR_GLOBAL)) {
593 * The default value for MAKE_META_PREFIX
594 * prints the absolute path of the target.
595 * This works be cause :H will generate '.' if there is no /
596 * and :tA will resolve that to cwd.
598 Var_Set(MAKE_META_PREFIX, "Building ${.TARGET:H:tA}/${.TARGET:T}", VAR_GLOBAL, 0);
603 memset(&Mybm, 0, sizeof(Mybm));
605 * We consider ourselves master of all within ${.MAKE.META.BAILIWICK}
607 metaBailiwick = Lst_Init(FALSE);
608 cp = Var_Subst(NULL, "${.MAKE.META.BAILIWICK:O:u:tA}", VAR_GLOBAL, 0);
610 str2Lst_Append(metaBailiwick, cp, NULL);
613 * We ignore any paths that start with ${.MAKE.META.IGNORE_PATHS}
615 metaIgnorePaths = Lst_Init(FALSE);
616 Var_Append(MAKE_META_IGNORE_PATHS,
617 "/dev /etc /proc /tmp /var/run /var/tmp ${TMPDIR}", VAR_GLOBAL);
619 "${" MAKE_META_IGNORE_PATHS ":O:u:tA}", VAR_GLOBAL, 0);
621 str2Lst_Append(metaIgnorePaths, cp, NULL);
626 * In each case below we allow for job==NULL
629 meta_job_start(Job *job, GNode *gn)
638 pbm->mfp = meta_create(pbm, gn);
639 #ifdef USE_FILEMON_ONCE
640 /* compat mode we open the filemon dev once per command */
645 if (pbm->mfp != NULL && useFilemon) {
648 pbm->mon_fd = pbm->filemon_fd = -1;
654 * The child calls this before doing anything.
655 * It does not disturb our state.
658 meta_job_child(Job *job)
670 if (pbm->mfp != NULL && useFilemon) {
671 if (ioctl(pbm->filemon_fd, FILEMON_SET_PID, &pid) < 0) {
672 err(1, "Could not set filemon pid!");
679 meta_job_error(Job *job, GNode *gn, int flags, int status)
681 char cwd[MAXPATHLEN];
691 if (pbm->mfp != NULL) {
692 fprintf(pbm->mfp, "*** Error code %d%s\n",
694 (flags & JOB_IGNERR) ?
698 Var_Set(".ERROR_TARGET", gn->path ? gn->path : gn->name, VAR_GLOBAL, 0);
700 getcwd(cwd, sizeof(cwd));
701 Var_Set(".ERROR_CWD", cwd, VAR_GLOBAL, 0);
702 if (pbm && pbm->meta_fname[0]) {
703 Var_Set(".ERROR_META_FILE", pbm->meta_fname, VAR_GLOBAL, 0);
705 meta_job_finish(job);
709 meta_job_output(Job *job, char *cp, const char *nl)
718 if (pbm->mfp != NULL) {
720 static char *meta_prefix = NULL;
721 static int meta_prefix_len;
726 meta_prefix = Var_Subst(NULL, "${" MAKE_META_PREFIX "}", VAR_GLOBAL, 0);
727 if ((cp2 = strchr(meta_prefix, '$')))
728 meta_prefix_len = cp2 - meta_prefix;
730 meta_prefix_len = strlen(meta_prefix);
732 if (strncmp(cp, meta_prefix, meta_prefix_len) == 0) {
733 cp = strchr(cp+1, '\n');
738 fprintf(pbm->mfp, "%s%s", cp, nl);
743 meta_cmd_finish(void *pbmp)
746 BuildMon *pbm = pbmp;
751 if (pbm->filemon_fd >= 0) {
752 close(pbm->filemon_fd);
753 filemon_read(pbm->mfp, pbm->mon_fd);
754 pbm->filemon_fd = pbm->mon_fd = -1;
760 meta_job_finish(Job *job)
769 if (pbm->mfp != NULL) {
770 meta_cmd_finish(pbm);
773 pbm->meta_fname[0] = '\0';
778 * Fetch a full line from fp - growing bufp if needed
779 * Return length in bufp.
782 fgetLine(char **bufp, size_t *szp, int o, FILE *fp)
789 if (fgets(&buf[o], bufsz - o, fp) != NULL) {
791 x = o + strlen(&buf[o]);
792 if (buf[x - 1] == '\n')
795 * We need to grow the buffer.
796 * The meta file can give us a clue.
798 if (fstat(fileno(fp), &fs) == 0) {
802 newsz = ROUNDUP((fs.st_size / 2), BUFSIZ);
804 newsz = ROUNDUP(fs.st_size, BUFSIZ);
806 fprintf(debug_file, "growing buffer %u -> %u\n",
807 (unsigned)bufsz, (unsigned)newsz);
808 p = bmake_realloc(buf, newsz);
811 *szp = bufsz = newsz;
813 if (!fgets(&buf[x], bufsz - x, fp))
814 return x; /* truncated! */
823 prefix_match(void *p, void *q)
825 const char *prefix = p;
826 const char *path = q;
827 size_t n = strlen(prefix);
829 return (0 == strncmp(path, prefix, n));
833 string_match(const void *p, const void *q)
838 return strcmp(p1, p2);
843 * When running with 'meta' functionality, a target can be out-of-date
844 * if any of the references in its meta data file is more recent.
845 * We have to track the latestdir on a per-process basis.
847 #define LDIR_VNAME_FMT ".meta.%d.ldir"
850 * It is possible that a .meta file is corrupted,
851 * if we detect this we want to reproduce it.
852 * Setting oodate TRUE will have that effect.
854 #define CHECK_VALID_META(p) if (!(p && *p)) { \
855 warnx("%s: %d: malformed", fname, lineno); \
860 #define DEQUOTE(p) if (*p == '\'') { \
863 if ((ep = strchr(p, '\''))) \
868 meta_oodate(GNode *gn, Boolean oodate)
870 static char *tmpdir = NULL;
871 static char cwd[MAXPATHLEN];
873 char latestdir[MAXPATHLEN];
874 char fname[MAXPATHLEN];
875 char fname1[MAXPATHLEN];
876 char fname2[MAXPATHLEN];
881 static size_t cwdlen = 0;
882 static size_t tmplen = 0;
884 Boolean needOODATE = FALSE;
888 return oodate; /* we're done */
890 missingFiles = Lst_Init(FALSE);
893 * We need to check if the target is out-of-date. This includes
894 * checking if the expanded command has changed. This in turn
895 * requires that all variables are set in the same way that they
896 * would be if the target needs to be re-built.
900 meta_name(gn, fname, sizeof(fname), NULL, NULL);
902 #ifdef DEBUG_META_MODE
904 fprintf(debug_file, "meta_oodate: %s\n", fname);
907 if ((fp = fopen(fname, "r")) != NULL) {
908 static char *buf = NULL;
920 buf = bmake_malloc(bufsz);
924 if (getcwd(cwd, sizeof(cwd)) == NULL)
925 err(1, "Could not get current working directory");
926 cwdlen = strlen(cwd);
930 tmpdir = getTmpdir();
931 tmplen = strlen(tmpdir);
934 /* we want to track all the .meta we read */
935 Var_Append(".MAKE.META.FILES", fname, VAR_GLOBAL);
937 ln = Lst_First(gn->commands);
938 while (!oodate && (x = fgetLine(&buf, &bufsz, 0, fp)) > 0) {
940 if (buf[x - 1] == '\n')
943 warnx("%s: %d: line truncated at %u", fname, lineno, x);
949 /* Find the start of the build monitor section. */
951 if (strncmp(buf, "-- filemon", 10) == 0) {
955 if (strncmp(buf, "# buildmon", 10) == 0) {
961 /* Delimit the record type. */
963 #ifdef DEBUG_META_MODE
965 fprintf(debug_file, "%s: %d: %s\n", fname, lineno, buf);
970 * We are in the 'filemon' output section.
971 * Each record from filemon follows the general form:
976 * <key> is a single letter, denoting the syscall.
977 * <pid> is the process that made the syscall.
978 * <data> is the arguments (of interest).
981 case '#': /* comment */
982 case 'V': /* version */
986 * We need to track pathnames per-process.
988 * Each process run by make, starts off in the 'CWD'
989 * recorded in the .meta file, if it chdirs ('C')
990 * elsewhere we need to track that - but only for
991 * that process. If it forks ('F'), we initialize
992 * the child to have the same cwd as its parent.
994 * We also need to track the 'latestdir' of
995 * interest. This is usually the same as cwd, but
996 * not if a process is reading directories.
998 * Each time we spot a different process ('pid')
999 * we save the current value of 'latestdir' in a
1000 * variable qualified by 'lastpid', and
1001 * re-initialize 'latestdir' to any pre-saved
1002 * value for the current 'pid' and 'CWD' if none.
1004 CHECK_VALID_META(p);
1006 if (pid > 0 && pid != lastpid) {
1011 /* We need to remember this. */
1012 Var_Set(ldir_vname, latestdir, VAR_GLOBAL, 0);
1014 snprintf(ldir_vname, sizeof(ldir_vname), LDIR_VNAME_FMT, pid);
1016 ldir = Var_Value(ldir_vname, VAR_GLOBAL, &tp);
1018 strlcpy(latestdir, ldir, sizeof(latestdir));
1022 strlcpy(latestdir, cwd, sizeof(latestdir));
1024 /* Skip past the pid. */
1025 if (strsep(&p, " ") == NULL)
1027 #ifdef DEBUG_META_MODE
1029 fprintf(debug_file, "%s: %d: cwd=%s ldir=%s\n", fname, lineno, cwd, latestdir);
1034 CHECK_VALID_META(p);
1036 /* Process according to record type. */
1038 case 'X': /* eXit */
1039 Var_Delete(ldir_vname, VAR_GLOBAL);
1040 lastpid = 0; /* no need to save ldir_vname */
1043 case 'F': /* [v]Fork */
1050 snprintf(cldir, sizeof(cldir), LDIR_VNAME_FMT, child);
1051 Var_Set(cldir, latestdir, VAR_GLOBAL, 0);
1056 case 'C': /* Chdir */
1057 /* Update the latest directory. */
1058 strlcpy(latestdir, p, sizeof(latestdir));
1061 case 'M': /* renaMe */
1063 * For 'M'oves we want to check
1064 * the src as for 'R'ead
1065 * and the target as for 'W'rite.
1067 cp = p; /* save this for a second */
1068 /* now get target */
1069 if (strsep(&p, " ") == NULL)
1071 CHECK_VALID_META(p);
1074 /* 'L' and 'M' put single quotes around the args */
1076 DEQUOTE(move_target);
1078 case 'D': /* unlink */
1079 if (*p == '/' && !Lst_IsEmpty(missingFiles)) {
1080 /* remove p from the missingFiles list if present */
1081 if ((ln = Lst_Find(missingFiles, p, string_match)) != NULL) {
1082 char *tp = Lst_Datum(ln);
1083 Lst_Remove(missingFiles, ln);
1085 ln = NULL; /* we're done with it */
1088 if (buf[0] == 'M') {
1089 /* the target of the mv is a file 'W'ritten */
1090 #ifdef DEBUG_META_MODE
1092 fprintf(debug_file, "meta_oodate: M %s -> %s\n",
1099 case 'L': /* Link */
1102 * the src as for 'R'ead
1103 * and the target as for 'W'rite.
1106 /* now get target */
1107 if (strsep(&p, " ") == NULL)
1109 CHECK_VALID_META(p);
1110 /* 'L' and 'M' put single quotes around the args */
1113 #ifdef DEBUG_META_MODE
1115 fprintf(debug_file, "meta_oodate: L %s -> %s\n",
1119 case 'W': /* Write */
1122 * If a file we generated within our bailiwick
1123 * but outside of .OBJDIR is missing,
1124 * we need to do it again.
1126 /* ignore non-absolute paths */
1130 if (Lst_IsEmpty(metaBailiwick))
1133 /* ignore cwd - normal dependencies handle those */
1134 if (strncmp(p, cwd, cwdlen) == 0)
1137 if (!Lst_ForEach(metaBailiwick, prefix_match, p))
1140 /* tmpdir might be within */
1141 if (tmplen > 0 && strncmp(p, tmpdir, tmplen) == 0)
1144 /* ignore anything containing the string "tmp" */
1145 if ((strstr("tmp", p)))
1148 if (stat(p, &fs) < 0) {
1149 Lst_AtEnd(missingFiles, bmake_strdup(p));
1155 #ifdef DEBUG_META_MODE
1157 fprintf(debug_file, "meta_oodate: L src %s\n", p);
1160 case 'R': /* Read */
1161 case 'E': /* Exec */
1163 * Check for runtime files that can't
1164 * be part of the dependencies because
1165 * they are _expected_ to change.
1168 Lst_ForEach(metaIgnorePaths, prefix_match, p)) {
1169 #ifdef DEBUG_META_MODE
1171 fprintf(debug_file, "meta_oodate: ignoring: %s\n",
1177 if ((cp = strrchr(p, '/'))) {
1180 * We don't normally expect to see this,
1181 * but we do expect it to change.
1183 if (strcmp(cp, makeDependfile) == 0)
1188 * The rest of the record is the file name.
1189 * Check if it's not an absolute path.
1198 sdirs[sdx++] = p; /* done */
1200 if (strcmp(".", p) == 0)
1201 continue; /* no point */
1203 /* Check vs latestdir */
1204 snprintf(fname1, sizeof(fname1), "%s/%s", latestdir, p);
1205 sdirs[sdx++] = fname1;
1207 if (strcmp(latestdir, cwd) != 0) {
1209 snprintf(fname2, sizeof(fname2), "%s/%s", cwd, p);
1210 sdirs[sdx++] = fname2;
1213 sdirs[sdx++] = NULL;
1215 for (sdp = sdirs; *sdp && !found; sdp++) {
1216 #ifdef DEBUG_META_MODE
1218 fprintf(debug_file, "%s: %d: looking for: %s\n", fname, lineno, *sdp);
1220 if (stat(*sdp, &fs) == 0) {
1226 #ifdef DEBUG_META_MODE
1228 fprintf(debug_file, "%s: %d: found: %s\n", fname, lineno, p);
1230 if (!S_ISDIR(fs.st_mode) &&
1231 fs.st_mtime > gn->mtime) {
1233 fprintf(debug_file, "%s: %d: file '%s' is newer than the target...\n", fname, lineno, p);
1235 } else if (S_ISDIR(fs.st_mode)) {
1236 /* Update the latest directory. */
1237 realpath(p, latestdir);
1239 } else if (errno == ENOENT && *p == '/' &&
1240 strncmp(p, cwd, cwdlen) != 0) {
1242 * A referenced file outside of CWD is missing.
1243 * We cannot catch every eventuality here...
1246 fprintf(debug_file, "%s: %d: file '%s' may have moved?...\n", fname, lineno, p);
1254 if (!oodate && buf[0] == 'L' && link_src != NULL)
1255 goto check_link_src;
1256 } else if (strcmp(buf, "CMD") == 0) {
1258 * Compare the current command with the one in the
1263 fprintf(debug_file, "%s: %d: there were more build commands in the meta data file than there are now...\n", fname, lineno);
1266 char *cmd = (char *)Lst_Datum(ln);
1267 Boolean hasOODATE = FALSE;
1269 if (strstr(cmd, "$?"))
1271 else if ((cp = strstr(cmd, ".OODATE"))) {
1272 /* check for $[{(].OODATE[:)}] */
1273 if (cp > cmd + 2 && cp[-2] == '$')
1279 fprintf(debug_file, "%s: %d: cannot compare command using .OODATE\n", fname, lineno);
1281 cmd = Var_Subst(NULL, cmd, gn, TRUE);
1283 if ((cp = strchr(cmd, '\n'))) {
1287 * This command contains newlines, we need to
1288 * fetch more from the .meta file before we
1289 * attempt a comparison.
1291 /* first put the newline back at buf[x - 1] */
1294 /* now fetch the next line */
1295 if ((n = fgetLine(&buf, &bufsz, x, fp)) <= 0)
1299 if (buf[x - 1] != '\n') {
1300 warnx("%s: %d: line truncated at %u", fname, lineno, x);
1303 cp = strchr(++cp, '\n');
1305 if (buf[x - 1] == '\n')
1309 !(gn->type & OP_NOMETA_CMP) &&
1310 strcmp(p, cmd) != 0) {
1312 fprintf(debug_file, "%s: %d: a build command has changed\n%s\nvs\n%s\n", fname, lineno, p, cmd);
1313 if (!metaIgnoreCMDs)
1319 } else if (strcmp(buf, "CWD") == 0) {
1321 * Check if there are extra commands now
1322 * that weren't in the meta data file.
1324 if (!oodate && ln != NULL) {
1326 fprintf(debug_file, "%s: %d: there are extra build commands now that weren't in the meta data file\n", fname, lineno);
1329 if (strcmp(p, cwd) != 0) {
1331 fprintf(debug_file, "%s: %d: the current working directory has changed from '%s' to '%s'\n", fname, lineno, p, curdir);
1338 if (!Lst_IsEmpty(missingFiles)) {
1340 fprintf(debug_file, "%s: missing files: %s...\n",
1341 fname, (char *)Lst_Datum(Lst_First(missingFiles)));
1343 Lst_Destroy(missingFiles, (FreeProc *)free);
1346 if ((gn->type & OP_META)) {
1348 fprintf(debug_file, "%s: required but missing\n", fname);
1352 if (oodate && needOODATE) {
1354 * Target uses .OODATE which is empty; or we wouldn't be here.
1355 * We have decided it is oodate, so .OODATE needs to be set.
1356 * All we can sanely do is set it to .ALLSRC.
1358 Var_Delete(OODATE, gn);
1359 Var_Set(OODATE, Var_Value(ALLSRC, gn, &cp), gn, 0);
1366 /* support for compat mode */
1368 static int childPipe[2];
1371 meta_compat_start(void)
1373 #ifdef USE_FILEMON_ONCE
1375 * We need to re-open filemon for each cmd.
1377 BuildMon *pbm = &Mybm;
1379 if (pbm->mfp != NULL && useFilemon) {
1382 pbm->mon_fd = pbm->filemon_fd = -1;
1385 if (pipe(childPipe) < 0)
1386 Punt("Cannot create pipe: %s", strerror(errno));
1387 /* Set close-on-exec flag for both */
1388 (void)fcntl(childPipe[0], F_SETFD, 1);
1389 (void)fcntl(childPipe[1], F_SETFD, 1);
1393 meta_compat_child(void)
1395 meta_job_child(NULL);
1396 if (dup2(childPipe[1], 1) < 0 ||
1398 execError("dup2", "pipe");
1404 meta_compat_parent(void)
1409 close(childPipe[1]); /* child side */
1410 fp = fdopen(childPipe[0], "r");
1411 while (fgets(buf, sizeof(buf), fp)) {
1412 meta_job_output(NULL, buf, "");
1418 #endif /* USE_META */