1 /* $NetBSD: meta.c,v 1.113 2020/09/02 04:08:54 rillig Exp $ */
4 * Implement 'meta' mode.
5 * Adapted from John Birrell's patches to FreeBSD make.
9 * Copyright (c) 2009-2016, 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.
41 #elif !defined(HAVE_DIRNAME)
42 char * dirname(char *);
45 #if !defined(HAVE_CONFIG_H) || defined(HAVE_ERR_H)
54 #include "filemon/filemon.h"
57 static BuildMon Mybm; /* for compat */
58 static Lst metaBailiwick; /* our scope of control */
59 static char *metaBailiwickStr; /* string storage for the list */
60 static Lst metaIgnorePaths; /* paths we deliberately ignore */
61 static char *metaIgnorePathsStr; /* string storage for the list */
63 #ifndef MAKE_META_IGNORE_PATHS
64 #define MAKE_META_IGNORE_PATHS ".MAKE.META.IGNORE_PATHS"
66 #ifndef MAKE_META_IGNORE_PATTERNS
67 #define MAKE_META_IGNORE_PATTERNS ".MAKE.META.IGNORE_PATTERNS"
69 #ifndef MAKE_META_IGNORE_FILTER
70 #define MAKE_META_IGNORE_FILTER ".MAKE.META.IGNORE_FILTER"
73 Boolean useMeta = FALSE;
74 static Boolean useFilemon = FALSE;
75 static Boolean writeMeta = FALSE;
76 static Boolean metaMissing = FALSE; /* oodate if missing */
77 static Boolean filemonMissing = FALSE; /* oodate if missing */
78 static Boolean metaEnv = FALSE; /* don't save env unless asked */
79 static Boolean metaVerbose = FALSE;
80 static Boolean metaIgnoreCMDs = FALSE; /* ignore CMDs in .meta files */
81 static Boolean metaIgnorePatterns = FALSE; /* do we need to do pattern matches */
82 static Boolean metaIgnoreFilter = FALSE; /* do we have more complex filtering? */
83 static Boolean metaCurdirOk = FALSE; /* write .meta in .CURDIR Ok? */
84 static Boolean metaSilent = FALSE; /* if we have a .meta be SILENT */
86 extern Boolean forceJobs;
87 extern Boolean comatMake;
88 extern char **environ;
90 #define MAKE_META_PREFIX ".MAKE.META.PREFIX"
93 # define N2U(n, u) (((n) + ((u) - 1)) / (u))
96 # define ROUNDUP(n, u) (N2U((n), (u)) * (u))
99 #if !defined(HAVE_STRSEP)
100 # define strsep(s, d) stresep((s), (d), 0)
104 * Filemon is a kernel module which snoops certain syscalls.
115 * See meta_oodate below - we mainly care about 'E' and 'R'.
117 * We can still use meta mode without filemon, but
118 * the benefits are more limited.
123 * Open the filemon device.
126 meta_open_filemon(BuildMon *pbm)
132 if (!useFilemon || !pbm->mfp)
135 pbm->filemon = filemon_open();
136 if (pbm->filemon == NULL) {
138 warn("Could not open filemon %s", filemon_path());
143 * We use a file outside of '.'
144 * to avoid a FreeBSD kernel bug where unlink invalidates
145 * cwd causing getcwd to do a lot more work.
146 * We only care about the descriptor.
148 pbm->mon_fd = mkTempFile("filemon.XXXXXX", NULL);
149 if ((dupfd = dup(pbm->mon_fd)) == -1) {
150 err(1, "Could not dup filemon output!");
152 (void)fcntl(dupfd, F_SETFD, FD_CLOEXEC);
153 if (filemon_setfd(pbm->filemon, dupfd) == -1) {
154 err(1, "Could not set filemon file descriptor!");
156 /* we don't need these once we exec */
157 (void)fcntl(pbm->mon_fd, F_SETFD, FD_CLOEXEC);
161 * Read the build monitor output file and write records to the target's
165 filemon_read(FILE *mfp, int fd)
171 /* Check if we're not writing to a meta data file.*/
174 close(fd); /* not interested */
178 if (lseek(fd, (off_t)0, SEEK_SET) < 0) {
180 warn("Could not rewind filemon");
184 fprintf(mfp, "\n-- filemon acquired metadata --\n");
186 while ((n = read(fd, buf, sizeof(buf))) > 0) {
187 if ((int)fwrite(buf, 1, n, mfp) < n)
199 * when realpath() fails,
200 * we use this, to clean up ./ and ../
203 eat_dots(char *buf, size_t bufsz, int dots)
224 cp = strstr(buf, eat);
227 if (dots == 2 && cp > buf) {
230 } while (cp > buf && *cp != '/');
233 strlcpy(cp, cp2, bufsz - (cp - buf));
235 return; /* can't happen? */
242 meta_name(char *mname, size_t mnamelen,
247 char buf[MAXPATHLEN];
255 * Weed out relative paths from the target file name.
256 * We have to be careful though since if target is a
257 * symlink, the result will be unstable.
258 * So we use realpath() just to get the dirname, and leave the
259 * basename as given to us.
261 if ((cp = strrchr(tname, '/'))) {
262 if (cached_realpath(tname, buf)) {
263 if ((rp = strrchr(buf, '/'))) {
266 if (strcmp(cp, rp) != 0)
267 strlcpy(rp, cp, sizeof(buf) - (rp - buf));
272 * We likely have a directory which is about to be made.
273 * We pretend realpath() succeeded, to have a chance
274 * of generating the same meta file name that we will
277 if (tname[0] == '/') {
278 strlcpy(buf, tname, sizeof(buf));
280 snprintf(buf, sizeof(buf), "%s/%s", cwd, tname);
282 eat_dots(buf, sizeof(buf), 1); /* ./ */
283 eat_dots(buf, sizeof(buf), 2); /* ../ */
287 /* on some systems dirname may modify its arg */
288 tp = bmake_strdup(tname);
290 if (strcmp(dname, dtp) == 0)
291 snprintf(mname, mnamelen, "%s.meta", tname);
293 ldname = strlen(dname);
294 if (strncmp(dname, dtp, ldname) == 0 && dtp[ldname] == '/')
295 snprintf(mname, mnamelen, "%s/%s.meta", dname, &tname[ldname+1]);
297 snprintf(mname, mnamelen, "%s/%s.meta", dname, tname);
300 * Replace path separators in the file name after the
301 * current object directory path.
303 cp = mname + strlen(dname) + 1;
305 while (*cp != '\0') {
316 * Return true if running ${.MAKE}
317 * Bypassed if target is flagged .MAKE
320 is_submake(void *cmdp, void *gnp)
322 static const char *p_make = NULL;
329 int rc = 0; /* keep looking */
332 p_make = Var_Value(".MAKE", gn, &cp);
333 p_len = strlen(p_make);
335 cp = strchr(cmd, '$');
337 mp = Var_Subst(cmd, gn, VARE_WANTRES);
340 cp2 = strstr(cmd, p_make);
342 switch (cp2[p_len]) {
350 if (cp2 > cmd && rc > 0) {
357 rc = 0; /* no match */
366 typedef struct meta_file_s {
372 printCMD(void *cmdp, void *mfpp)
374 meta_file_t *mfp = mfpp;
376 char *cmd_freeIt = NULL;
378 if (strchr(cmd, '$')) {
379 cmd = cmd_freeIt = Var_Subst(cmd, mfp->gn, VARE_WANTRES);
381 fprintf(mfp->fp, "CMD %s\n", cmd);
387 * Certain node types never get a .meta file
389 #define SKIP_META_TYPE(_type) do { \
390 if ((gn->type & __CONCAT(OP_, _type))) { \
392 fprintf(debug_file, "Skipping meta for %s: .%s\n", \
393 gn->name, __STRING(_type)); \
401 * Do we need/want a .meta file ?
404 meta_needed(GNode *gn, const char *dname,
405 char *objdir, int verbose)
407 struct make_stat mst;
410 verbose = DEBUG(META);
412 /* This may be a phony node which we don't want meta data for... */
413 /* Skip .meta for .BEGIN, .END, .ERROR etc as well. */
414 /* Or it may be explicitly flagged as .NOMETA */
415 SKIP_META_TYPE(NOMETA);
416 /* Unless it is explicitly flagged as .META */
417 if (!(gn->type & OP_META)) {
418 SKIP_META_TYPE(PHONY);
419 SKIP_META_TYPE(SPECIAL);
420 SKIP_META_TYPE(MAKE);
423 /* Check if there are no commands to execute. */
424 if (Lst_IsEmpty(gn->commands)) {
426 fprintf(debug_file, "Skipping meta for %s: no commands\n",
430 if ((gn->type & (OP_META|OP_SUBMAKE)) == OP_SUBMAKE) {
431 /* OP_SUBMAKE is a bit too aggressive */
432 if (Lst_ForEach(gn->commands, is_submake, gn)) {
434 fprintf(debug_file, "Skipping meta for %s: .SUBMAKE\n",
440 /* The object directory may not exist. Check it.. */
441 if (cached_stat(dname, &mst) != 0) {
443 fprintf(debug_file, "Skipping meta for %s: no .OBJDIR\n",
448 /* make sure these are canonical */
449 if (cached_realpath(dname, objdir))
452 /* If we aren't in the object directory, don't create a meta file. */
453 if (!metaCurdirOk && strcmp(curdir, dname) == 0) {
455 fprintf(debug_file, "Skipping meta for %s: .OBJDIR == .CURDIR\n",
464 meta_create(BuildMon *pbm, GNode *gn)
467 char buf[MAXPATHLEN];
468 char objdir[MAXPATHLEN];
474 char *p[5]; /* >= possible uses */
480 dname = Var_Value(".OBJDIR", gn, &p[i++]);
481 tname = Var_Value(TARGET, gn, &p[i++]);
483 /* if this succeeds objdir is realpath of dname */
484 if (!meta_needed(gn, dname, objdir, TRUE))
491 /* Describe the target we are building */
492 mp = Var_Subst("${" MAKE_META_PREFIX "}", gn, VARE_WANTRES);
494 fprintf(stdout, "%s\n", mp);
497 /* Get the basename of the target */
498 if ((cp = strrchr(tname, '/')) == NULL) {
507 /* Don't create meta data. */
510 fname = meta_name(pbm->meta_fname, sizeof(pbm->meta_fname),
511 dname, tname, objdir);
513 #ifdef DEBUG_META_MODE
515 fprintf(debug_file, "meta_create: %s\n", fname);
518 if ((mf.fp = fopen(fname, "w")) == NULL)
519 err(1, "Could not open meta file '%s'", fname);
521 fprintf(mf.fp, "# Meta data file %s\n", fname);
525 Lst_ForEach(gn->commands, printCMD, &mf);
527 fprintf(mf.fp, "CWD %s\n", getcwd(buf, sizeof(buf)));
528 fprintf(mf.fp, "TARGET %s\n", tname);
529 cp = Var_Value(".OODATE", gn, &p[i++]);
531 fprintf(mf.fp, "OODATE %s\n", cp);
534 for (ptr = environ; *ptr != NULL; ptr++)
535 fprintf(mf.fp, "ENV %s\n", *ptr);
538 fprintf(mf.fp, "-- command output --\n");
541 Var_Append(".MAKE.META.FILES", fname, VAR_GLOBAL);
542 Var_Append(".MAKE.META.CREATED", fname, VAR_GLOBAL);
544 gn->type |= OP_META; /* in case anyone wants to know */
546 gn->type |= OP_SILENT;
549 for (i--; i >= 0; i--) {
571 * Initialization we need before reading makefiles.
577 /* this allows makefiles to test if we have filemon support */
578 Var_Set(".MAKE.PATH_FILEMON", filemon_path(), VAR_GLOBAL);
583 #define get_mode_bf(bf, token) \
584 if ((cp = strstr(make_mode, token))) \
585 bf = boolValue(&cp[sizeof(token) - 1])
588 * Initialization we need after reading makefiles.
591 meta_mode_init(const char *make_mode)
601 if (strstr(make_mode, "env"))
603 if (strstr(make_mode, "verb"))
605 if (strstr(make_mode, "read"))
607 if (strstr(make_mode, "nofilemon"))
609 if (strstr(make_mode, "ignore-cmd"))
610 metaIgnoreCMDs = TRUE;
612 get_mode_bf(filemonMissing, "missing-filemon=");
613 get_mode_bf(metaCurdirOk, "curdirok=");
614 get_mode_bf(metaMissing, "missing-meta=");
615 get_mode_bf(metaSilent, "silent=");
617 if (metaVerbose && !Var_Exists(MAKE_META_PREFIX, VAR_GLOBAL)) {
619 * The default value for MAKE_META_PREFIX
620 * prints the absolute path of the target.
621 * This works be cause :H will generate '.' if there is no /
622 * and :tA will resolve that to cwd.
624 Var_Set(MAKE_META_PREFIX, "Building ${.TARGET:H:tA}/${.TARGET:T}", VAR_GLOBAL);
629 memset(&Mybm, 0, sizeof(Mybm));
631 * We consider ourselves master of all within ${.MAKE.META.BAILIWICK}
633 metaBailiwick = Lst_Init();
634 metaBailiwickStr = Var_Subst("${.MAKE.META.BAILIWICK:O:u:tA}",
635 VAR_GLOBAL, VARE_WANTRES);
636 str2Lst_Append(metaBailiwick, metaBailiwickStr, NULL);
638 * We ignore any paths that start with ${.MAKE.META.IGNORE_PATHS}
640 metaIgnorePaths = Lst_Init();
641 Var_Append(MAKE_META_IGNORE_PATHS,
642 "/dev /etc /proc /tmp /var/run /var/tmp ${TMPDIR}", VAR_GLOBAL);
643 metaIgnorePathsStr = Var_Subst("${" MAKE_META_IGNORE_PATHS ":O:u:tA}",
644 VAR_GLOBAL, VARE_WANTRES);
645 str2Lst_Append(metaIgnorePaths, metaIgnorePathsStr, NULL);
648 * We ignore any paths that match ${.MAKE.META.IGNORE_PATTERNS}
651 if (Var_Value(MAKE_META_IGNORE_PATTERNS, VAR_GLOBAL, &cp)) {
652 metaIgnorePatterns = TRUE;
656 if (Var_Value(MAKE_META_IGNORE_FILTER, VAR_GLOBAL, &cp)) {
657 metaIgnoreFilter = TRUE;
663 * In each case below we allow for job==NULL
666 meta_job_start(Job *job, GNode *gn)
675 pbm->mfp = meta_create(pbm, gn);
676 #ifdef USE_FILEMON_ONCE
677 /* compat mode we open the filemon dev once per command */
682 if (pbm->mfp != NULL && useFilemon) {
683 meta_open_filemon(pbm);
692 * The child calls this before doing anything.
693 * It does not disturb our state.
696 meta_job_child(Job *job)
706 if (pbm->mfp != NULL) {
707 close(fileno(pbm->mfp));
708 if (useFilemon && pbm->filemon) {
712 if (filemon_setpid_child(pbm->filemon, pid) == -1) {
713 err(1, "Could not set filemon pid!");
721 meta_job_parent(Job *job, pid_t pid)
723 #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV)
731 if (useFilemon && pbm->filemon) {
732 filemon_setpid_parent(pbm->filemon, pid);
738 meta_job_fd(Job *job)
740 #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV)
748 if (useFilemon && pbm->filemon) {
749 return filemon_readfd(pbm->filemon);
756 meta_job_event(Job *job)
758 #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV)
766 if (useFilemon && pbm->filemon) {
767 return filemon_process(pbm->filemon);
774 meta_job_error(Job *job, GNode *gn, int flags, int status)
776 char cwd[MAXPATHLEN];
786 if (pbm->mfp != NULL) {
787 fprintf(pbm->mfp, "\n*** Error code %d%s\n",
789 (flags & JOB_IGNERR) ?
793 Var_Set(".ERROR_TARGET", gn->path ? gn->path : gn->name, VAR_GLOBAL);
795 getcwd(cwd, sizeof(cwd));
796 Var_Set(".ERROR_CWD", cwd, VAR_GLOBAL);
797 if (pbm->meta_fname[0]) {
798 Var_Set(".ERROR_META_FILE", pbm->meta_fname, VAR_GLOBAL);
800 meta_job_finish(job);
804 meta_job_output(Job *job, char *cp, const char *nl)
813 if (pbm->mfp != NULL) {
815 static char *meta_prefix = NULL;
816 static int meta_prefix_len;
821 meta_prefix = Var_Subst("${" MAKE_META_PREFIX "}",
822 VAR_GLOBAL, VARE_WANTRES);
823 if ((cp2 = strchr(meta_prefix, '$')))
824 meta_prefix_len = cp2 - meta_prefix;
826 meta_prefix_len = strlen(meta_prefix);
828 if (strncmp(cp, meta_prefix, meta_prefix_len) == 0) {
829 cp = strchr(cp+1, '\n');
834 fprintf(pbm->mfp, "%s%s", cp, nl);
839 meta_cmd_finish(void *pbmp)
842 BuildMon *pbm = pbmp;
852 while (filemon_process(pbm->filemon) > 0)
854 if (filemon_close(pbm->filemon) == -1)
856 x = filemon_read(pbm->mfp, pbm->mon_fd);
857 if (error == 0 && x != 0)
863 fprintf(pbm->mfp, "\n"); /* ensure end with newline */
868 meta_job_finish(Job *job)
879 if (pbm->mfp != NULL) {
880 error = meta_cmd_finish(pbm);
881 x = fclose(pbm->mfp);
882 if (error == 0 && x != 0)
885 pbm->meta_fname[0] = '\0';
893 if (metaBailiwick != NULL)
894 Lst_Free(metaBailiwick);
895 free(metaBailiwickStr);
896 if (metaIgnorePaths != NULL)
897 Lst_Free(metaIgnorePaths);
898 free(metaIgnorePathsStr);
902 * Fetch a full line from fp - growing bufp if needed
903 * Return length in bufp.
906 fgetLine(char **bufp, size_t *szp, int o, FILE *fp)
913 if (fgets(&buf[o], bufsz - o, fp) != NULL) {
915 x = o + strlen(&buf[o]);
916 if (buf[x - 1] == '\n')
919 * We need to grow the buffer.
920 * The meta file can give us a clue.
922 if (fstat(fileno(fp), &fs) == 0) {
926 newsz = ROUNDUP((fs.st_size / 2), BUFSIZ);
928 newsz = ROUNDUP(fs.st_size, BUFSIZ);
930 return x; /* truncated */
932 fprintf(debug_file, "growing buffer %u -> %u\n",
933 (unsigned)bufsz, (unsigned)newsz);
934 p = bmake_realloc(buf, newsz);
937 *szp = bufsz = newsz;
939 if (!fgets(&buf[x], bufsz - x, fp))
940 return x; /* truncated! */
948 /* Lst_ForEach wants 1 to stop search */
950 prefix_match(void *p, void *q)
952 const char *prefix = p;
953 const char *path = q;
954 size_t n = strlen(prefix);
956 return strncmp(path, prefix, n) == 0;
959 /* See if the path equals prefix or starts with "prefix/". */
961 path_match(const void *p, const void *q)
963 const char *path = p;
964 const char *prefix = q;
965 size_t n = strlen(prefix);
967 if (strncmp(path, prefix, n) != 0)
969 return path[n] == '\0' || path[n] == '/';
973 string_match(const void *p, const void *q)
975 return strcmp(p, q) == 0;
980 meta_ignore(GNode *gn, const char *p)
982 char fname[MAXPATHLEN];
988 cached_realpath(p, fname); /* clean it up */
989 if (Lst_ForEach(metaIgnorePaths, prefix_match, fname)) {
990 #ifdef DEBUG_META_MODE
992 fprintf(debug_file, "meta_oodate: ignoring path: %s\n",
999 if (metaIgnorePatterns) {
1003 Var_Set(".p.", p, gn);
1004 expr = "${" MAKE_META_IGNORE_PATTERNS ":@m@${.p.:M$m}@}";
1005 pm = Var_Subst(expr, gn, VARE_WANTRES);
1007 #ifdef DEBUG_META_MODE
1009 fprintf(debug_file, "meta_oodate: ignoring pattern: %s\n",
1018 if (metaIgnoreFilter) {
1021 /* skip if filter result is empty */
1022 snprintf(fname, sizeof(fname),
1023 "${%s:L:${%s:ts:}}",
1024 p, MAKE_META_IGNORE_FILTER);
1025 fm = Var_Subst(fname, gn, VARE_WANTRES);
1027 #ifdef DEBUG_META_MODE
1029 fprintf(debug_file, "meta_oodate: ignoring filtered: %s\n",
1041 * When running with 'meta' functionality, a target can be out-of-date
1042 * if any of the references in its meta data file is more recent.
1043 * We have to track the latestdir on a per-process basis.
1045 #define LCWD_VNAME_FMT ".meta.%d.lcwd"
1046 #define LDIR_VNAME_FMT ".meta.%d.ldir"
1049 * It is possible that a .meta file is corrupted,
1050 * if we detect this we want to reproduce it.
1051 * Setting oodate TRUE will have that effect.
1053 #define CHECK_VALID_META(p) if (!(p && *p)) { \
1054 warnx("%s: %d: malformed", fname, lineno); \
1059 #define DEQUOTE(p) if (*p == '\'') { \
1062 if ((ep = strchr(p, '\''))) \
1067 meta_oodate(GNode *gn, Boolean oodate)
1069 static char *tmpdir = NULL;
1070 static char cwd[MAXPATHLEN];
1071 char lcwd_vname[64];
1072 char ldir_vname[64];
1073 char lcwd[MAXPATHLEN];
1074 char latestdir[MAXPATHLEN];
1075 char fname[MAXPATHLEN];
1076 char fname1[MAXPATHLEN];
1077 char fname2[MAXPATHLEN];
1078 char fname3[MAXPATHLEN];
1085 static size_t cwdlen = 0;
1086 static size_t tmplen = 0;
1088 Boolean needOODATE = FALSE;
1090 char *pa[4]; /* >= possible uses */
1092 int have_filemon = FALSE;
1095 return oodate; /* we're done */
1099 dname = Var_Value(".OBJDIR", gn, &pa[i++]);
1100 tname = Var_Value(TARGET, gn, &pa[i++]);
1102 /* if this succeeds fname3 is realpath of dname */
1103 if (!meta_needed(gn, dname, fname3, FALSE))
1107 missingFiles = Lst_Init();
1110 * We need to check if the target is out-of-date. This includes
1111 * checking if the expanded command has changed. This in turn
1112 * requires that all variables are set in the same way that they
1113 * would be if the target needs to be re-built.
1117 meta_name(fname, sizeof(fname), dname, tname, dname);
1119 #ifdef DEBUG_META_MODE
1121 fprintf(debug_file, "meta_oodate: %s\n", fname);
1124 if ((fp = fopen(fname, "r")) != NULL) {
1125 static char *buf = NULL;
1126 static size_t bufsz;
1132 struct make_stat mst;
1136 buf = bmake_malloc(bufsz);
1140 if (getcwd(cwd, sizeof(cwd)) == NULL)
1141 err(1, "Could not get current working directory");
1142 cwdlen = strlen(cwd);
1144 strlcpy(lcwd, cwd, sizeof(lcwd));
1145 strlcpy(latestdir, cwd, sizeof(latestdir));
1148 tmpdir = getTmpdir();
1149 tmplen = strlen(tmpdir);
1152 /* we want to track all the .meta we read */
1153 Var_Append(".MAKE.META.FILES", fname, VAR_GLOBAL);
1155 ln = Lst_First(gn->commands);
1156 while (!oodate && (x = fgetLine(&buf, &bufsz, 0, fp)) > 0) {
1158 if (buf[x - 1] == '\n')
1161 warnx("%s: %d: line truncated at %u", fname, lineno, x);
1167 /* Find the start of the build monitor section. */
1168 if (!have_filemon) {
1169 if (strncmp(buf, "-- filemon", 10) == 0) {
1170 have_filemon = TRUE;
1173 if (strncmp(buf, "# buildmon", 10) == 0) {
1174 have_filemon = TRUE;
1179 /* Delimit the record type. */
1181 #ifdef DEBUG_META_MODE
1183 fprintf(debug_file, "%s: %d: %s\n", fname, lineno, buf);
1188 * We are in the 'filemon' output section.
1189 * Each record from filemon follows the general form:
1191 * <key> <pid> <data>
1194 * <key> is a single letter, denoting the syscall.
1195 * <pid> is the process that made the syscall.
1196 * <data> is the arguments (of interest).
1199 case '#': /* comment */
1200 case 'V': /* version */
1204 * We need to track pathnames per-process.
1206 * Each process run by make, starts off in the 'CWD'
1207 * recorded in the .meta file, if it chdirs ('C')
1208 * elsewhere we need to track that - but only for
1209 * that process. If it forks ('F'), we initialize
1210 * the child to have the same cwd as its parent.
1212 * We also need to track the 'latestdir' of
1213 * interest. This is usually the same as cwd, but
1214 * not if a process is reading directories.
1216 * Each time we spot a different process ('pid')
1217 * we save the current value of 'latestdir' in a
1218 * variable qualified by 'lastpid', and
1219 * re-initialize 'latestdir' to any pre-saved
1220 * value for the current 'pid' and 'CWD' if none.
1222 CHECK_VALID_META(p);
1224 if (pid > 0 && pid != lastpid) {
1229 /* We need to remember these. */
1230 Var_Set(lcwd_vname, lcwd, VAR_GLOBAL);
1231 Var_Set(ldir_vname, latestdir, VAR_GLOBAL);
1233 snprintf(lcwd_vname, sizeof(lcwd_vname), LCWD_VNAME_FMT, pid);
1234 snprintf(ldir_vname, sizeof(ldir_vname), LDIR_VNAME_FMT, pid);
1236 ldir = Var_Value(ldir_vname, VAR_GLOBAL, &tp);
1238 strlcpy(latestdir, ldir, sizeof(latestdir));
1241 ldir = Var_Value(lcwd_vname, VAR_GLOBAL, &tp);
1243 strlcpy(lcwd, ldir, sizeof(lcwd));
1247 /* Skip past the pid. */
1248 if (strsep(&p, " ") == NULL)
1250 #ifdef DEBUG_META_MODE
1252 fprintf(debug_file, "%s: %d: %d: %c: cwd=%s lcwd=%s ldir=%s\n",
1254 pid, buf[0], cwd, lcwd, latestdir);
1259 CHECK_VALID_META(p);
1261 /* Process according to record type. */
1263 case 'X': /* eXit */
1264 Var_Delete(lcwd_vname, VAR_GLOBAL);
1265 Var_Delete(ldir_vname, VAR_GLOBAL);
1266 lastpid = 0; /* no need to save ldir_vname */
1269 case 'F': /* [v]Fork */
1276 snprintf(cldir, sizeof(cldir), LCWD_VNAME_FMT, child);
1277 Var_Set(cldir, lcwd, VAR_GLOBAL);
1278 snprintf(cldir, sizeof(cldir), LDIR_VNAME_FMT, child);
1279 Var_Set(cldir, latestdir, VAR_GLOBAL);
1280 #ifdef DEBUG_META_MODE
1282 fprintf(debug_file, "%s: %d: %d: cwd=%s lcwd=%s ldir=%s\n",
1284 child, cwd, lcwd, latestdir);
1290 case 'C': /* Chdir */
1291 /* Update lcwd and latest directory. */
1292 strlcpy(latestdir, p, sizeof(latestdir));
1293 strlcpy(lcwd, p, sizeof(lcwd));
1294 Var_Set(lcwd_vname, lcwd, VAR_GLOBAL);
1295 Var_Set(ldir_vname, lcwd, VAR_GLOBAL);
1296 #ifdef DEBUG_META_MODE
1298 fprintf(debug_file, "%s: %d: cwd=%s ldir=%s\n", fname, lineno, cwd, lcwd);
1302 case 'M': /* renaMe */
1304 * For 'M'oves we want to check
1305 * the src as for 'R'ead
1306 * and the target as for 'W'rite.
1308 cp = p; /* save this for a second */
1309 /* now get target */
1310 if (strsep(&p, " ") == NULL)
1312 CHECK_VALID_META(p);
1315 /* 'L' and 'M' put single quotes around the args */
1317 DEQUOTE(move_target);
1319 case 'D': /* unlink */
1320 if (*p == '/' && !Lst_IsEmpty(missingFiles)) {
1321 /* remove any missingFiles entries that match p */
1322 ln = Lst_Find(missingFiles, path_match, p);
1328 nln = Lst_FindFrom(missingFiles,
1331 tp = LstNode_Datum(ln);
1332 Lst_Remove(missingFiles, ln);
1334 } while ((ln = nln) != NULL);
1337 if (buf[0] == 'M') {
1338 /* the target of the mv is a file 'W'ritten */
1339 #ifdef DEBUG_META_MODE
1341 fprintf(debug_file, "meta_oodate: M %s -> %s\n",
1348 case 'L': /* Link */
1351 * the src as for 'R'ead
1352 * and the target as for 'W'rite.
1355 /* now get target */
1356 if (strsep(&p, " ") == NULL)
1358 CHECK_VALID_META(p);
1359 /* 'L' and 'M' put single quotes around the args */
1362 #ifdef DEBUG_META_MODE
1364 fprintf(debug_file, "meta_oodate: L %s -> %s\n",
1368 case 'W': /* Write */
1371 * If a file we generated within our bailiwick
1372 * but outside of .OBJDIR is missing,
1373 * we need to do it again.
1375 /* ignore non-absolute paths */
1379 if (Lst_IsEmpty(metaBailiwick))
1382 /* ignore cwd - normal dependencies handle those */
1383 if (strncmp(p, cwd, cwdlen) == 0)
1386 if (!Lst_ForEach(metaBailiwick, prefix_match, p))
1389 /* tmpdir might be within */
1390 if (tmplen > 0 && strncmp(p, tmpdir, tmplen) == 0)
1393 /* ignore anything containing the string "tmp" */
1394 if ((strstr("tmp", p)))
1397 if ((link_src != NULL && cached_lstat(p, &mst) < 0) ||
1398 (link_src == NULL && cached_stat(p, &mst) < 0)) {
1399 if (!meta_ignore(gn, p)) {
1400 if (Lst_Find(missingFiles, string_match, p) == NULL)
1401 Lst_Append(missingFiles, bmake_strdup(p));
1408 #ifdef DEBUG_META_MODE
1410 fprintf(debug_file, "meta_oodate: L src %s\n", p);
1413 case 'R': /* Read */
1414 case 'E': /* Exec */
1416 * Check for runtime files that can't
1417 * be part of the dependencies because
1418 * they are _expected_ to change.
1420 if (meta_ignore(gn, p))
1424 * The rest of the record is the file name.
1425 * Check if it's not an absolute path.
1434 sdirs[sdx++] = p; /* done */
1436 if (strcmp(".", p) == 0)
1437 continue; /* no point */
1439 /* Check vs latestdir */
1440 snprintf(fname1, sizeof(fname1), "%s/%s", latestdir, p);
1441 sdirs[sdx++] = fname1;
1443 if (strcmp(latestdir, lcwd) != 0) {
1445 snprintf(fname2, sizeof(fname2), "%s/%s", lcwd, p);
1446 sdirs[sdx++] = fname2;
1448 if (strcmp(lcwd, cwd) != 0) {
1450 snprintf(fname3, sizeof(fname3), "%s/%s", cwd, p);
1451 sdirs[sdx++] = fname3;
1454 sdirs[sdx++] = NULL;
1456 for (sdp = sdirs; *sdp && !found; sdp++) {
1457 #ifdef DEBUG_META_MODE
1459 fprintf(debug_file, "%s: %d: looking for: %s\n", fname, lineno, *sdp);
1461 if (cached_stat(*sdp, &mst) == 0) {
1467 #ifdef DEBUG_META_MODE
1469 fprintf(debug_file, "%s: %d: found: %s\n", fname, lineno, p);
1471 if (!S_ISDIR(mst.mst_mode) &&
1472 mst.mst_mtime > gn->mtime) {
1474 fprintf(debug_file, "%s: %d: file '%s' is newer than the target...\n", fname, lineno, p);
1476 } else if (S_ISDIR(mst.mst_mode)) {
1477 /* Update the latest directory. */
1478 cached_realpath(p, latestdir);
1480 } else if (errno == ENOENT && *p == '/' &&
1481 strncmp(p, cwd, cwdlen) != 0) {
1483 * A referenced file outside of CWD is missing.
1484 * We cannot catch every eventuality here...
1486 if (Lst_Find(missingFiles, string_match, p) == NULL)
1487 Lst_Append(missingFiles, bmake_strdup(p));
1490 if (buf[0] == 'E') {
1491 /* previous latestdir is no longer relevant */
1492 strlcpy(latestdir, lcwd, sizeof(latestdir));
1498 if (!oodate && buf[0] == 'L' && link_src != NULL)
1499 goto check_link_src;
1500 } else if (strcmp(buf, "CMD") == 0) {
1502 * Compare the current command with the one in the
1507 fprintf(debug_file, "%s: %d: there were more build commands in the meta data file than there are now...\n", fname, lineno);
1510 char *cmd = LstNode_Datum(ln);
1511 Boolean hasOODATE = FALSE;
1513 if (strstr(cmd, "$?"))
1515 else if ((cp = strstr(cmd, ".OODATE"))) {
1516 /* check for $[{(].OODATE[:)}] */
1517 if (cp > cmd + 2 && cp[-2] == '$')
1523 fprintf(debug_file, "%s: %d: cannot compare command using .OODATE\n", fname, lineno);
1525 cmd = Var_Subst(cmd, gn, VARE_WANTRES|VARE_UNDEFERR);
1527 if ((cp = strchr(cmd, '\n'))) {
1531 * This command contains newlines, we need to
1532 * fetch more from the .meta file before we
1533 * attempt a comparison.
1535 /* first put the newline back at buf[x - 1] */
1538 /* now fetch the next line */
1539 if ((n = fgetLine(&buf, &bufsz, x, fp)) <= 0)
1543 if (buf[x - 1] != '\n') {
1544 warnx("%s: %d: line truncated at %u", fname, lineno, x);
1547 cp = strchr(++cp, '\n');
1549 if (buf[x - 1] == '\n')
1554 !(gn->type & OP_NOMETA_CMP) &&
1555 strcmp(p, cmd) != 0) {
1557 fprintf(debug_file, "%s: %d: a build command has changed\n%s\nvs\n%s\n", fname, lineno, p, cmd);
1558 if (!metaIgnoreCMDs)
1562 ln = LstNode_Next(ln);
1564 } else if (strcmp(buf, "CWD") == 0) {
1566 * Check if there are extra commands now
1567 * that weren't in the meta data file.
1569 if (!oodate && ln != NULL) {
1571 fprintf(debug_file, "%s: %d: there are extra build commands now that weren't in the meta data file\n", fname, lineno);
1574 CHECK_VALID_META(p);
1575 if (strcmp(p, cwd) != 0) {
1577 fprintf(debug_file, "%s: %d: the current working directory has changed from '%s' to '%s'\n", fname, lineno, p, curdir);
1584 if (!Lst_IsEmpty(missingFiles)) {
1586 fprintf(debug_file, "%s: missing files: %s...\n",
1587 fname, (char *)LstNode_Datum(Lst_First(missingFiles)));
1590 if (!oodate && !have_filemon && filemonMissing) {
1592 fprintf(debug_file, "%s: missing filemon data\n", fname);
1596 if (writeMeta && (metaMissing || (gn->type & OP_META))) {
1599 /* if target is in .CURDIR we do not need a meta file */
1600 if (gn->path && (cp = strrchr(gn->path, '/')) && cp > gn->path) {
1601 if (strncmp(curdir, gn->path, (cp - gn->path)) != 0) {
1602 cp = NULL; /* not in .CURDIR */
1607 fprintf(debug_file, "%s: required but missing\n", fname);
1609 needOODATE = TRUE; /* assume the worst */
1614 Lst_Destroy(missingFiles, free);
1616 if (oodate && needOODATE) {
1618 * Target uses .OODATE which is empty; or we wouldn't be here.
1619 * We have decided it is oodate, so .OODATE needs to be set.
1620 * All we can sanely do is set it to .ALLSRC.
1622 Var_Delete(OODATE, gn);
1623 Var_Set(OODATE, Var_Value(ALLSRC, gn, &cp), gn);
1628 for (i--; i >= 0; i--) {
1634 /* support for compat mode */
1636 static int childPipe[2];
1639 meta_compat_start(void)
1641 #ifdef USE_FILEMON_ONCE
1643 * We need to re-open filemon for each cmd.
1645 BuildMon *pbm = &Mybm;
1647 if (pbm->mfp != NULL && useFilemon) {
1648 meta_open_filemon(pbm);
1651 pbm->filemon = NULL;
1654 if (pipe(childPipe) < 0)
1655 Punt("Cannot create pipe: %s", strerror(errno));
1656 /* Set close-on-exec flag for both */
1657 (void)fcntl(childPipe[0], F_SETFD, FD_CLOEXEC);
1658 (void)fcntl(childPipe[1], F_SETFD, FD_CLOEXEC);
1662 meta_compat_child(void)
1664 meta_job_child(NULL);
1665 if (dup2(childPipe[1], 1) < 0 ||
1667 execError("dup2", "pipe");
1673 meta_compat_parent(pid_t child)
1675 int outfd, metafd, maxfd, nfds;
1679 meta_job_parent(NULL, child);
1680 close(childPipe[1]); /* child side */
1681 outfd = childPipe[0];
1683 metafd = Mybm.filemon ? filemon_readfd(Mybm.filemon) : -1;
1693 while (outfd != -1 || metafd != -1) {
1696 FD_SET(outfd, &readfds);
1699 FD_SET(metafd, &readfds);
1701 nfds = select(maxfd + 1, &readfds, NULL, NULL, NULL);
1708 if (outfd != -1 && FD_ISSET(outfd, &readfds)) do {
1709 /* XXX this is not line-buffered */
1710 ssize_t nread = read(outfd, buf, sizeof(buf) - 1);
1718 fwrite(buf, 1, (size_t)nread, stdout);
1721 meta_job_output(NULL, buf, "");
1723 if (metafd != -1 && FD_ISSET(metafd, &readfds)) {
1724 if (meta_job_event(NULL) <= 0)
1730 #endif /* USE_META */