diff options
Diffstat (limited to 'meta.c')
| -rw-r--r-- | meta.c | 1367 |
1 files changed, 1367 insertions, 0 deletions
@@ -0,0 +1,1367 @@ +/* $NetBSD: meta.c,v 1.29 2013/03/31 05:49:51 sjg Exp $ */ + +/* + * Implement 'meta' mode. + * Adapted from John Birrell's patches to FreeBSD make. + * --sjg + */ +/* + * Copyright (c) 2009-2010, Juniper Networks, Inc. + * Portions Copyright (c) 2009, John Birrell. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ +#if defined(USE_META) + +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif +#include <sys/stat.h> +#include <sys/ioctl.h> +#include <fcntl.h> +#include <libgen.h> +#include <errno.h> +#if !defined(HAVE_CONFIG_H) || defined(HAVE_ERR_H) +#include <err.h> +#endif + +#include "make.h" +#include "job.h" + +#ifdef HAVE_FILEMON_H +# include <filemon.h> +#endif +#if !defined(USE_FILEMON) && defined(FILEMON_SET_FD) +# define USE_FILEMON +#endif + +static BuildMon Mybm; /* for compat */ +static Lst metaBailiwick; /* our scope of control */ + +Boolean useMeta = FALSE; +static Boolean useFilemon = FALSE; +static Boolean writeMeta = FALSE; +static Boolean metaEnv = FALSE; /* don't save env unless asked */ +static Boolean metaVerbose = FALSE; +static Boolean metaIgnoreCMDs = FALSE; /* ignore CMDs in .meta files */ +static Boolean metaCurdirOk = FALSE; /* write .meta in .CURDIR Ok? */ +static Boolean metaSilent = FALSE; /* if we have a .meta be SILENT */ + +extern Boolean forceJobs; +extern Boolean comatMake; +extern char **environ; + +#define MAKE_META_PREFIX ".MAKE.META.PREFIX" + +#ifndef N2U +# define N2U(n, u) (((n) + ((u) - 1)) / (u)) +#endif +#ifndef ROUNDUP +# define ROUNDUP(n, u) (N2U((n), (u)) * (u)) +#endif + +#if !defined(HAVE_STRSEP) +# define strsep(s, d) stresep((s), (d), 0) +#endif + +/* + * Filemon is a kernel module which snoops certain syscalls. + * + * C chdir + * E exec + * F [v]fork + * L [sym]link + * M rename + * R read + * W write + * S stat + * + * See meta_oodate below - we mainly care about 'E' and 'R'. + * + * We can still use meta mode without filemon, but + * the benefits are more limited. + */ +#ifdef USE_FILEMON +# ifndef _PATH_FILEMON +# define _PATH_FILEMON "/dev/filemon" +# endif + +/* + * Open the filemon device. + */ +static void +filemon_open(BuildMon *pbm) +{ + int retry; + + pbm->mon_fd = pbm->filemon_fd = -1; + if (!useFilemon) + return; + + for (retry = 5; retry >= 0; retry--) { + if ((pbm->filemon_fd = open(_PATH_FILEMON, O_RDWR)) >= 0) + break; + } + + if (pbm->filemon_fd < 0) { + useFilemon = FALSE; + warn("Could not open %s", _PATH_FILEMON); + return; + } + + /* + * We use a file outside of '.' + * to avoid a FreeBSD kernel bug where unlink invalidates + * cwd causing getcwd to do a lot more work. + * We only care about the descriptor. + */ + pbm->mon_fd = mkTempFile("filemon.XXXXXX", NULL); + if (ioctl(pbm->filemon_fd, FILEMON_SET_FD, &pbm->mon_fd) < 0) { + err(1, "Could not set filemon file descriptor!"); + } + /* we don't need these once we exec */ + (void)fcntl(pbm->mon_fd, F_SETFD, 1); + (void)fcntl(pbm->filemon_fd, F_SETFD, 1); +} + +/* + * Read the build monitor output file and write records to the target's + * metadata file. + */ +static void +filemon_read(FILE *mfp, int fd) +{ + FILE *fp; + char buf[BUFSIZ]; + + /* Check if we're not writing to a meta data file.*/ + if (mfp == NULL) { + if (fd >= 0) + close(fd); /* not interested */ + return; + } + /* rewind */ + (void)lseek(fd, (off_t)0, SEEK_SET); + if ((fp = fdopen(fd, "r")) == NULL) + err(1, "Could not read build monitor file '%d'", fd); + + fprintf(mfp, "-- filemon acquired metadata --\n"); + + while (fgets(buf, sizeof(buf), fp)) { + fprintf(mfp, "%s", buf); + } + fflush(mfp); + clearerr(fp); + fclose(fp); +} +#endif + +/* + * when realpath() fails, + * we use this, to clean up ./ and ../ + */ +static void +eat_dots(char *buf, size_t bufsz, int dots) +{ + char *cp; + char *cp2; + const char *eat; + size_t eatlen; + + switch (dots) { + case 1: + eat = "/./"; + eatlen = 2; + break; + case 2: + eat = "/../"; + eatlen = 3; + break; + default: + return; + } + + do { + cp = strstr(buf, eat); + if (cp) { + cp2 = cp + eatlen; + if (dots == 2 && cp > buf) { + do { + cp--; + } while (cp > buf && *cp != '/'); + } + if (*cp == '/') { + strlcpy(cp, cp2, bufsz - (cp - buf)); + } else { + return; /* can't happen? */ + } + } + } while (cp); +} + +static char * +meta_name(struct GNode *gn, char *mname, size_t mnamelen, + const char *dname, + const char *tname) +{ + char buf[MAXPATHLEN]; + char cwd[MAXPATHLEN]; + char *rp; + char *cp; + char *tp; + char *p[4]; /* >= number of possible uses */ + int i; + + i = 0; + if (!dname) + dname = Var_Value(".OBJDIR", gn, &p[i++]); + if (!tname) + tname = Var_Value(TARGET, gn, &p[i++]); + + if (realpath(dname, cwd)) + dname = cwd; + + /* + * Weed out relative paths from the target file name. + * We have to be careful though since if target is a + * symlink, the result will be unstable. + * So we use realpath() just to get the dirname, and leave the + * basename as given to us. + */ + if ((cp = strrchr(tname, '/'))) { + if (realpath(tname, buf)) { + if ((rp = strrchr(buf, '/'))) { + rp++; + cp++; + if (strcmp(cp, rp) != 0) + strlcpy(rp, cp, sizeof(buf) - (rp - buf)); + } + tname = buf; + } else { + /* + * We likely have a directory which is about to be made. + * We pretend realpath() succeeded, to have a chance + * of generating the same meta file name that we will + * next time through. + */ + if (tname[0] == '/') { + strlcpy(buf, tname, sizeof(buf)); + } else { + snprintf(buf, sizeof(buf), "%s/%s", cwd, tname); + } + eat_dots(buf, sizeof(buf), 1); /* ./ */ + eat_dots(buf, sizeof(buf), 2); /* ../ */ + tname = buf; + } + } + /* on some systems dirname may modify its arg */ + tp = bmake_strdup(tname); + if (strcmp(dname, dirname(tp)) == 0) + snprintf(mname, mnamelen, "%s.meta", tname); + else { + snprintf(mname, mnamelen, "%s/%s.meta", dname, tname); + + /* + * Replace path separators in the file name after the + * current object directory path. + */ + cp = mname + strlen(dname) + 1; + + while (*cp != '\0') { + if (*cp == '/') + *cp = '_'; + cp++; + } + } + free(tp); + for (i--; i >= 0; i--) { + if (p[i]) + free(p[i]); + } + return (mname); +} + +/* + * Return true if running ${.MAKE} + * Bypassed if target is flagged .MAKE + */ +static int +is_submake(void *cmdp, void *gnp) +{ + static char *p_make = NULL; + static int p_len; + char *cmd = cmdp; + GNode *gn = gnp; + char *mp = NULL; + char *cp; + char *cp2; + int rc = 0; /* keep looking */ + + if (!p_make) { + p_make = Var_Value(".MAKE", gn, &cp); + p_len = strlen(p_make); + } + cp = strchr(cmd, '$'); + if ((cp)) { + mp = Var_Subst(NULL, cmd, gn, FALSE); + cmd = mp; + } + cp2 = strstr(cmd, p_make); + if ((cp2)) { + switch (cp2[p_len]) { + case '\0': + case ' ': + case '\t': + case '\n': + rc = 1; + break; + } + if (cp2 > cmd && rc > 0) { + switch (cp2[-1]) { + case ' ': + case '\t': + case '\n': + break; + default: + rc = 0; /* no match */ + break; + } + } + } + if (mp) + free(mp); + return (rc); +} + +typedef struct meta_file_s { + FILE *fp; + GNode *gn; +} meta_file_t; + +static int +printCMD(void *cmdp, void *mfpp) +{ + meta_file_t *mfp = mfpp; + char *cmd = cmdp; + char *cp = NULL; + + if (strchr(cmd, '$')) { + cmd = cp = Var_Subst(NULL, cmd, mfp->gn, FALSE); + } + fprintf(mfp->fp, "CMD %s\n", cmd); + if (cp) + free(cp); + return 0; +} + +/* + * Certain node types never get a .meta file + */ +#define SKIP_META_TYPE(_type) do { \ + if ((gn->type & __CONCAT(OP_, _type))) { \ + if (DEBUG(META)) { \ + fprintf(debug_file, "Skipping meta for %s: .%s\n", \ + gn->name, __STRING(_type)); \ + } \ + return (NULL); \ + } \ +} while (0) + +static FILE * +meta_create(BuildMon *pbm, GNode *gn) +{ + meta_file_t mf; + char buf[MAXPATHLEN]; + char objdir[MAXPATHLEN]; + char **ptr; + const char *dname; + const char *tname; + char *fname; + const char *cp; + char *p[4]; /* >= possible uses */ + int i; + struct stat fs; + + + /* This may be a phony node which we don't want meta data for... */ + /* Skip .meta for .BEGIN, .END, .ERROR etc as well. */ + /* Or it may be explicitly flagged as .NOMETA */ + SKIP_META_TYPE(NOMETA); + /* Unless it is explicitly flagged as .META */ + if (!(gn->type & OP_META)) { + SKIP_META_TYPE(PHONY); + SKIP_META_TYPE(SPECIAL); + SKIP_META_TYPE(MAKE); + } + + mf.fp = NULL; + + i = 0; + + dname = Var_Value(".OBJDIR", gn, &p[i++]); + tname = Var_Value(TARGET, gn, &p[i++]); + + /* The object directory may not exist. Check it.. */ + if (stat(dname, &fs) != 0) { + if (DEBUG(META)) + fprintf(debug_file, "Skipping meta for %s: no .OBJDIR\n", + gn->name); + goto out; + } + /* Check if there are no commands to execute. */ + if (Lst_IsEmpty(gn->commands)) { + if (DEBUG(META)) + fprintf(debug_file, "Skipping meta for %s: no commands\n", + gn->name); + goto out; + } + + /* make sure these are canonical */ + if (realpath(dname, objdir)) + dname = objdir; + + /* If we aren't in the object directory, don't create a meta file. */ + if (!metaCurdirOk && strcmp(curdir, dname) == 0) { + if (DEBUG(META)) + fprintf(debug_file, "Skipping meta for %s: .OBJDIR == .CURDIR\n", + gn->name); + goto out; + } + if (!(gn->type & OP_META)) { + /* We do not generate .meta files for sub-makes */ + if (Lst_ForEach(gn->commands, is_submake, gn)) { + if (DEBUG(META)) + fprintf(debug_file, "Skipping meta for %s: .MAKE\n", + gn->name); + goto out; + } + } + + if (metaVerbose) { + char *mp; + + /* Describe the target we are building */ + mp = Var_Subst(NULL, "${" MAKE_META_PREFIX "}", gn, 0); + if (*mp) + fprintf(stdout, "%s\n", mp); + free(mp); + } + /* Get the basename of the target */ + if ((cp = strrchr(tname, '/')) == NULL) { + cp = tname; + } else { + cp++; + } + + fflush(stdout); + + if (strcmp(cp, makeDependfile) == 0) + goto out; + + if (!writeMeta) + /* Don't create meta data. */ + goto out; + + fname = meta_name(gn, pbm->meta_fname, sizeof(pbm->meta_fname), + dname, tname); + +#ifdef DEBUG_META_MODE + if (DEBUG(META)) + fprintf(debug_file, "meta_create: %s\n", fname); +#endif + + if ((mf.fp = fopen(fname, "w")) == NULL) + err(1, "Could not open meta file '%s'", fname); + + fprintf(mf.fp, "# Meta data file %s\n", fname); + + mf.gn = gn; + + Lst_ForEach(gn->commands, printCMD, &mf); + + fprintf(mf.fp, "CWD %s\n", getcwd(buf, sizeof(buf))); + fprintf(mf.fp, "TARGET %s\n", tname); + + if (metaEnv) { + for (ptr = environ; *ptr != NULL; ptr++) + fprintf(mf.fp, "ENV %s\n", *ptr); + } + + fprintf(mf.fp, "-- command output --\n"); + fflush(mf.fp); + + Var_Append(".MAKE.META.FILES", fname, VAR_GLOBAL); + Var_Append(".MAKE.META.CREATED", fname, VAR_GLOBAL); + + gn->type |= OP_META; /* in case anyone wants to know */ + if (metaSilent) { + gn->type |= OP_SILENT; + } + out: + for (i--; i >= 0; i--) { + if (p[i]) + free(p[i]); + } + + return (mf.fp); +} + +static Boolean +boolValue(char *s) +{ + switch(*s) { + case '0': + case 'N': + case 'n': + case 'F': + case 'f': + return FALSE; + } + return TRUE; +} + +/* + * Initialization we need before reading makefiles. + */ +void +meta_init() +{ +#ifdef USE_FILEMON + /* this allows makefiles to test if we have filemon support */ + Var_Set(".MAKE.PATH_FILEMON", _PATH_FILEMON, VAR_GLOBAL, 0); +#endif +} + + +/* + * Initialization we need after reading makefiles. + */ +void +meta_mode_init(const char *make_mode) +{ + static int once = 0; + char *cp; + + useMeta = TRUE; + useFilemon = TRUE; + writeMeta = TRUE; + + if (make_mode) { + if (strstr(make_mode, "env")) + metaEnv = TRUE; + if (strstr(make_mode, "verb")) + metaVerbose = TRUE; + if (strstr(make_mode, "read")) + writeMeta = FALSE; + if (strstr(make_mode, "nofilemon")) + useFilemon = FALSE; + if ((cp = strstr(make_mode, "curdirok="))) { + metaCurdirOk = boolValue(&cp[9]); + } + if ((cp = strstr(make_mode, "silent="))) { + metaSilent = boolValue(&cp[7]); + } + if (strstr(make_mode, "ignore-cmd")) + metaIgnoreCMDs = TRUE; + /* for backwards compatability */ + Var_Set(".MAKE.META_CREATED", "${.MAKE.META.CREATED}", VAR_GLOBAL, 0); + Var_Set(".MAKE.META_FILES", "${.MAKE.META.FILES}", VAR_GLOBAL, 0); + } + if (metaVerbose && !Var_Exists(MAKE_META_PREFIX, VAR_GLOBAL)) { + /* + * The default value for MAKE_META_PREFIX + * prints the absolute path of the target. + * This works be cause :H will generate '.' if there is no / + * and :tA will resolve that to cwd. + */ + Var_Set(MAKE_META_PREFIX, "Building ${.TARGET:H:tA}/${.TARGET:T}", VAR_GLOBAL, 0); + } + if (once) + return; + once = 1; + memset(&Mybm, 0, sizeof(Mybm)); + /* + * We consider ourselves master of all within ${.MAKE.META.BAILIWICK} + */ + metaBailiwick = Lst_Init(FALSE); + cp = Var_Subst(NULL, "${.MAKE.META.BAILIWICK:O:u:tA}", VAR_GLOBAL, 0); + if (cp) { + str2Lst_Append(metaBailiwick, cp, NULL); + } +} + +/* + * In each case below we allow for job==NULL + */ +void +meta_job_start(Job *job, GNode *gn) +{ + BuildMon *pbm; + + if (job != NULL) { + pbm = &job->bm; + } else { + pbm = &Mybm; + } + pbm->mfp = meta_create(pbm, gn); +#ifdef USE_FILEMON_ONCE + /* compat mode we open the filemon dev once per command */ + if (job == NULL) + return; +#endif +#ifdef USE_FILEMON + if (pbm->mfp != NULL && useFilemon) { + filemon_open(pbm); + } else { + pbm->mon_fd = pbm->filemon_fd = -1; + } +#endif +} + +/* + * The child calls this before doing anything. + * It does not disturb our state. + */ +void +meta_job_child(Job *job) +{ +#ifdef USE_FILEMON + BuildMon *pbm; + pid_t pid; + + if (job != NULL) { + pbm = &job->bm; + } else { + pbm = &Mybm; + } + pid = getpid(); + if (pbm->mfp != NULL && useFilemon) { + if (ioctl(pbm->filemon_fd, FILEMON_SET_PID, &pid) < 0) { + err(1, "Could not set filemon pid!"); + } + } +#endif +} + +void +meta_job_error(Job *job, GNode *gn, int flags, int status) +{ + char cwd[MAXPATHLEN]; + BuildMon *pbm; + + if (job != NULL) { + pbm = &job->bm; + } else { + if (!gn) + gn = job->node; + pbm = &Mybm; + } + if (pbm->mfp != NULL) { + fprintf(pbm->mfp, "*** Error code %d%s\n", + status, + (flags & JOB_IGNERR) ? + "(ignored)" : ""); + } + if (gn) { + Var_Set(".ERROR_TARGET", gn->path ? gn->path : gn->name, VAR_GLOBAL, 0); + } + getcwd(cwd, sizeof(cwd)); + Var_Set(".ERROR_CWD", cwd, VAR_GLOBAL, 0); + if (pbm && pbm->meta_fname[0]) { + Var_Set(".ERROR_META_FILE", pbm->meta_fname, VAR_GLOBAL, 0); + } + meta_job_finish(job); +} + +void +meta_job_output(Job *job, char *cp, const char *nl) +{ + BuildMon *pbm; + + if (job != NULL) { + pbm = &job->bm; + } else { + pbm = &Mybm; + } + if (pbm->mfp != NULL) { + if (metaVerbose) { + static char *meta_prefix = NULL; + static int meta_prefix_len; + + if (!meta_prefix) { + char *cp2; + + meta_prefix = Var_Subst(NULL, "${" MAKE_META_PREFIX "}", VAR_GLOBAL, 0); + if ((cp2 = strchr(meta_prefix, '$'))) + meta_prefix_len = cp2 - meta_prefix; + else + meta_prefix_len = strlen(meta_prefix); + } + if (strncmp(cp, meta_prefix, meta_prefix_len) == 0) { + cp = strchr(cp+1, '\n'); + if (!cp++) + return; + } + } + fprintf(pbm->mfp, "%s%s", cp, nl); + } +} + +void +meta_cmd_finish(void *pbmp) +{ +#ifdef USE_FILEMON + BuildMon *pbm = pbmp; + + if (!pbm) + pbm = &Mybm; + + if (pbm->filemon_fd >= 0) { + close(pbm->filemon_fd); + filemon_read(pbm->mfp, pbm->mon_fd); + pbm->filemon_fd = pbm->mon_fd = -1; + } +#endif +} + +void +meta_job_finish(Job *job) +{ + BuildMon *pbm; + + if (job != NULL) { + pbm = &job->bm; + } else { + pbm = &Mybm; + } + if (pbm->mfp != NULL) { + meta_cmd_finish(pbm); + fclose(pbm->mfp); + pbm->mfp = NULL; + pbm->meta_fname[0] = '\0'; + } +} + +/* + * Fetch a full line from fp - growing bufp if needed + * Return length in bufp. + */ +static int +fgetLine(char **bufp, size_t *szp, int o, FILE *fp) +{ + char *buf = *bufp; + size_t bufsz = *szp; + struct stat fs; + int x; + + if (fgets(&buf[o], bufsz - o, fp) != NULL) { + check_newline: + x = o + strlen(&buf[o]); + if (buf[x - 1] == '\n') + return x; + /* + * We need to grow the buffer. + * The meta file can give us a clue. + */ + if (fstat(fileno(fp), &fs) == 0) { + size_t newsz; + char *p; + + newsz = ROUNDUP((fs.st_size / 2), BUFSIZ); + if (newsz <= bufsz) + newsz = ROUNDUP(fs.st_size, BUFSIZ); + if (DEBUG(META)) + fprintf(debug_file, "growing buffer %u -> %u\n", + (unsigned)bufsz, (unsigned)newsz); + p = bmake_realloc(buf, newsz); + if (p) { + *bufp = buf = p; + *szp = bufsz = newsz; + /* fetch the rest */ + if (!fgets(&buf[x], bufsz - x, fp)) + return x; /* truncated! */ + goto check_newline; + } + } + } + return 0; +} + +static int +prefix_match(void *p, void *q) +{ + const char *prefix = p; + const char *path = q; + size_t n = strlen(prefix); + + return (0 == strncmp(path, prefix, n)); +} + +static int +string_match(const void *p, const void *q) +{ + const char *p1 = p; + const char *p2 = q; + + return strcmp(p1, p2); +} + + +/* + * When running with 'meta' functionality, a target can be out-of-date + * if any of the references in it's meta data file is more recent. + * We have to track the latestdir on a per-process basis. + */ +#define LDIR_VNAME_FMT ".meta.%d.ldir" + +/* + * It is possible that a .meta file is corrupted, + * if we detect this we want to reproduce it. + * Setting oodate TRUE will have that effect. + */ +#define CHECK_VALID_META(p) if (!(p && *p)) { \ + warnx("%s: %d: malformed", fname, lineno); \ + oodate = TRUE; \ + continue; \ + } + +Boolean +meta_oodate(GNode *gn, Boolean oodate) +{ + static char *tmpdir = NULL; + static char cwd[MAXPATHLEN]; + char ldir_vname[64]; + char latestdir[MAXPATHLEN]; + char fname[MAXPATHLEN]; + char fname1[MAXPATHLEN]; + char fname2[MAXPATHLEN]; + char *p; + char *cp; + static size_t cwdlen = 0; + static size_t tmplen = 0; + FILE *fp; + Boolean needOODATE = FALSE; + Lst missingFiles; + + if (oodate) + return oodate; /* we're done */ + + missingFiles = Lst_Init(FALSE); + + /* + * We need to check if the target is out-of-date. This includes + * checking if the expanded command has changed. This in turn + * requires that all variables are set in the same way that they + * would be if the target needs to be re-built. + */ + Make_DoAllVar(gn); + + meta_name(gn, fname, sizeof(fname), NULL, NULL); + +#ifdef DEBUG_META_MODE + if (DEBUG(META)) + fprintf(debug_file, "meta_oodate: %s\n", fname); +#endif + + if ((fp = fopen(fname, "r")) != NULL) { + static char *buf = NULL; + static size_t bufsz; + int lineno = 0; + int lastpid = 0; + int pid; + int f = 0; + int x; + LstNode ln; + struct stat fs; + + if (!buf) { + bufsz = 8 * BUFSIZ; + buf = bmake_malloc(bufsz); + } + + if (!cwdlen) { + if (getcwd(cwd, sizeof(cwd)) == NULL) + err(1, "Could not get current working directory"); + cwdlen = strlen(cwd); + } + + if (!tmpdir) { + tmpdir = getTmpdir(); + tmplen = strlen(tmpdir); + } + + /* we want to track all the .meta we read */ + Var_Append(".MAKE.META.FILES", fname, VAR_GLOBAL); + + ln = Lst_First(gn->commands); + while (!oodate && (x = fgetLine(&buf, &bufsz, 0, fp)) > 0) { + lineno++; + if (buf[x - 1] == '\n') + buf[x - 1] = '\0'; + else { + warnx("%s: %d: line truncated at %u", fname, lineno, x); + oodate = TRUE; + break; + } + /* Find the start of the build monitor section. */ + if (!f) { + if (strncmp(buf, "-- filemon", 10) == 0) { + f = 1; + continue; + } + if (strncmp(buf, "# buildmon", 10) == 0) { + f = 1; + continue; + } + } + + /* Delimit the record type. */ + p = buf; +#ifdef DEBUG_META_MODE + if (DEBUG(META)) + fprintf(debug_file, "%s: %d: %s\n", fname, lineno, buf); +#endif + strsep(&p, " "); + if (f) { + /* + * We are in the 'filemon' output section. + * Each record from filemon follows the general form: + * + * <key> <pid> <data> + * + * Where: + * <key> is a single letter, denoting the syscall. + * <pid> is the process that made the syscall. + * <data> is the arguments (of interest). + */ + switch(buf[0]) { + case '#': /* comment */ + case 'V': /* version */ + break; + default: + /* + * We need to track pathnames per-process. + * + * Each process run by make, starts off in the 'CWD' + * recorded in the .meta file, if it chdirs ('C') + * elsewhere we need to track that - but only for + * that process. If it forks ('F'), we initialize + * the child to have the same cwd as its parent. + * + * We also need to track the 'latestdir' of + * interest. This is usually the same as cwd, but + * not if a process is reading directories. + * + * Each time we spot a different process ('pid') + * we save the current value of 'latestdir' in a + * variable qualified by 'lastpid', and + * re-initialize 'latestdir' to any pre-saved + * value for the current 'pid' and 'CWD' if none. + */ + CHECK_VALID_META(p); + pid = atoi(p); + if (pid > 0 && pid != lastpid) { + char *ldir; + char *tp; + + if (lastpid > 0) { + /* We need to remember this. */ + Var_Set(ldir_vname, latestdir, VAR_GLOBAL, 0); + } + snprintf(ldir_vname, sizeof(ldir_vname), LDIR_VNAME_FMT, pid); + lastpid = pid; + ldir = Var_Value(ldir_vname, VAR_GLOBAL, &tp); + if (ldir) { + strlcpy(latestdir, ldir, sizeof(latestdir)); + if (tp) + free(tp); + } else + strlcpy(latestdir, cwd, sizeof(latestdir)); + } + /* Skip past the pid. */ + if (strsep(&p, " ") == NULL) + continue; +#ifdef DEBUG_META_MODE + if (DEBUG(META)) + fprintf(debug_file, "%s: %d: cwd=%s ldir=%s\n", fname, lineno, cwd, latestdir); +#endif + break; + } + + CHECK_VALID_META(p); + + /* Process according to record type. */ + switch (buf[0]) { + case 'X': /* eXit */ + Var_Delete(ldir_vname, VAR_GLOBAL); + lastpid = 0; /* no need to save ldir_vname */ + break; + + case 'F': /* [v]Fork */ + { + char cldir[64]; + int child; + + child = atoi(p); + if (child > 0) { + snprintf(cldir, sizeof(cldir), LDIR_VNAME_FMT, child); + Var_Set(cldir, latestdir, VAR_GLOBAL, 0); + } + } + break; + + case 'C': /* Chdir */ + /* Update the latest directory. */ + strlcpy(latestdir, p, sizeof(latestdir)); + break; + + case 'M': /* renaMe */ + if (Lst_IsEmpty(missingFiles)) + break; + /* 'L' and 'M' put single quotes around the args */ + if (*p == '\'') { + char *ep; + + p++; + if ((ep = strchr(p, '\''))) + *ep = '\0'; + } + /* FALLTHROUGH */ + case 'D': /* unlink */ + if (*p == '/' && !Lst_IsEmpty(missingFiles)) { + /* remove p from the missingFiles list if present */ + if ((ln = Lst_Find(missingFiles, p, string_match)) != NULL) { + char *tp = Lst_Datum(ln); + Lst_Remove(missingFiles, ln); + free(tp); + ln = NULL; /* we're done with it */ + } + } + break; + case 'L': /* Link */ + /* we want the target */ + if (strsep(&p, " ") == NULL) + continue; + CHECK_VALID_META(p); + /* 'L' and 'M' put single quotes around the args */ + if (*p == '\'') { + char *ep; + + p++; + if ((ep = strchr(p, '\''))) + *ep = '\0'; + } + /* FALLTHROUGH */ + case 'W': /* Write */ + /* + * If a file we generated within our bailiwick + * but outside of .OBJDIR is missing, + * we need to do it again. + */ + /* ignore non-absolute paths */ + if (*p != '/') + break; + + if (Lst_IsEmpty(metaBailiwick)) + break; + + /* ignore cwd - normal dependencies handle those */ + if (strncmp(p, cwd, cwdlen) == 0) + break; + + if (!Lst_ForEach(metaBailiwick, prefix_match, p)) + break; + + /* tmpdir might be within */ + if (tmplen > 0 && strncmp(p, tmpdir, tmplen) == 0) + break; + + /* ignore anything containing the string "tmp" */ + if ((strstr("tmp", p))) + break; + + if (stat(p, &fs) < 0) { + Lst_AtEnd(missingFiles, bmake_strdup(p)); + } + break; + case 'R': /* Read */ + case 'E': /* Exec */ + /* + * Check for runtime files that can't + * be part of the dependencies because + * they are _expected_ to change. + */ + if (strncmp(p, "/tmp/", 5) == 0 || + (tmplen > 0 && strncmp(p, tmpdir, tmplen) == 0)) + break; + + if (strncmp(p, "/var/", 5) == 0) + break; + + /* Ignore device files. */ + if (strncmp(p, "/dev/", 5) == 0) + break; + + /* Ignore /etc/ files. */ + if (strncmp(p, "/etc/", 5) == 0) + break; + + if ((cp = strrchr(p, '/'))) { + cp++; + /* + * We don't normally expect to see this, + * but we do expect it to change. + */ + if (strcmp(cp, makeDependfile) == 0) + break; + } + + /* + * The rest of the record is the file name. + * Check if it's not an absolute path. + */ + { + char *sdirs[4]; + char **sdp; + int sdx = 0; + int found = 0; + + if (*p == '/') { + sdirs[sdx++] = p; /* done */ + } else { + if (strcmp(".", p) == 0) + continue; /* no point */ + + /* Check vs latestdir */ + snprintf(fname1, sizeof(fname1), "%s/%s", latestdir, p); + sdirs[sdx++] = fname1; + + if (strcmp(latestdir, cwd) != 0) { + /* Check vs cwd */ + snprintf(fname2, sizeof(fname2), "%s/%s", cwd, p); + sdirs[sdx++] = fname2; + } + } + sdirs[sdx++] = NULL; + + for (sdp = sdirs; *sdp && !found; sdp++) { +#ifdef DEBUG_META_MODE + if (DEBUG(META)) + fprintf(debug_file, "%s: %d: looking for: %s\n", fname, lineno, *sdp); +#endif + if (stat(*sdp, &fs) == 0) { + found = 1; + p = *sdp; + } + } + if (found) { +#ifdef DEBUG_META_MODE + if (DEBUG(META)) + fprintf(debug_file, "%s: %d: found: %s\n", fname, lineno, p); +#endif + if (!S_ISDIR(fs.st_mode) && + fs.st_mtime > gn->mtime) { + if (DEBUG(META)) + fprintf(debug_file, "%s: %d: file '%s' is newer than the target...\n", fname, lineno, p); + oodate = TRUE; + } else if (S_ISDIR(fs.st_mode)) { + /* Update the latest directory. */ + realpath(p, latestdir); + } + } else if (errno == ENOENT && *p == '/' && + strncmp(p, cwd, cwdlen) != 0) { + /* + * A referenced file outside of CWD is missing. + * We cannot catch every eventuality here... + */ + if (DEBUG(META)) + fprintf(debug_file, "%s: %d: file '%s' may have moved?...\n", fname, lineno, p); + oodate = TRUE; + } + } + break; + default: + break; + } + } else if (strcmp(buf, "CMD") == 0) { + /* + * Compare the current command with the one in the + * meta data file. + */ + if (ln == NULL) { + if (DEBUG(META)) + fprintf(debug_file, "%s: %d: there were more build commands in the meta data file than there are now...\n", fname, lineno); + oodate = TRUE; + } else { + char *cmd = (char *)Lst_Datum(ln); + Boolean hasOODATE = FALSE; + + if (strstr(cmd, "$?")) + hasOODATE = TRUE; + else if ((cp = strstr(cmd, ".OODATE"))) { + /* check for $[{(].OODATE[:)}] */ + if (cp > cmd + 2 && cp[-2] == '$') + hasOODATE = TRUE; + } + if (hasOODATE) { + needOODATE = TRUE; + if (DEBUG(META)) + fprintf(debug_file, "%s: %d: cannot compare command using .OODATE\n", fname, lineno); + } + cmd = Var_Subst(NULL, cmd, gn, TRUE); + + if ((cp = strchr(cmd, '\n'))) { + int n; + + /* + * This command contains newlines, we need to + * fetch more from the .meta file before we + * attempt a comparison. + */ + /* first put the newline back at buf[x - 1] */ + buf[x - 1] = '\n'; + do { + /* now fetch the next line */ + if ((n = fgetLine(&buf, &bufsz, x, fp)) <= 0) + break; + x = n; + lineno++; + if (buf[x - 1] != '\n') { + warnx("%s: %d: line truncated at %u", fname, lineno, x); + break; + } + cp = strchr(++cp, '\n'); + } while (cp); + if (buf[x - 1] == '\n') + buf[x - 1] = '\0'; + } + if (!hasOODATE && + !(gn->type & OP_NOMETA_CMP) && + strcmp(p, cmd) != 0) { + if (DEBUG(META)) + fprintf(debug_file, "%s: %d: a build command has changed\n%s\nvs\n%s\n", fname, lineno, p, cmd); + if (!metaIgnoreCMDs) + oodate = TRUE; + } + free(cmd); + ln = Lst_Succ(ln); + } + } else if (strcmp(buf, "CWD") == 0) { + /* + * Check if there are extra commands now + * that weren't in the meta data file. + */ + if (!oodate && ln != NULL) { + if (DEBUG(META)) + fprintf(debug_file, "%s: %d: there are extra build commands now that weren't in the meta data file\n", fname, lineno); + oodate = TRUE; + } + if (strcmp(p, cwd) != 0) { + if (DEBUG(META)) + fprintf(debug_file, "%s: %d: the current working directory has changed from '%s' to '%s'\n", fname, lineno, p, curdir); + oodate = TRUE; + } + } + } + + fclose(fp); + if (!Lst_IsEmpty(missingFiles)) { + if (DEBUG(META)) + fprintf(debug_file, "%s: missing files: %s...\n", + fname, (char *)Lst_Datum(Lst_First(missingFiles))); + oodate = TRUE; + Lst_Destroy(missingFiles, (FreeProc *)free); + } + } else { + if ((gn->type & OP_META)) { + if (DEBUG(META)) + fprintf(debug_file, "%s: required but missing\n", fname); + oodate = TRUE; + } + } + if (oodate && needOODATE) { + /* + * Target uses .OODATE which is empty; or we wouldn't be here. + * We have decided it is oodate, so .OODATE needs to be set. + * All we can sanely do is set it to .ALLSRC. + */ + Var_Delete(OODATE, gn); + Var_Set(OODATE, Var_Value(ALLSRC, gn, &cp), gn, 0); + if (cp) + free(cp); + } + return oodate; +} + +/* support for compat mode */ + +static int childPipe[2]; + +void +meta_compat_start(void) +{ +#ifdef USE_FILEMON_ONCE + /* + * We need to re-open filemon for each cmd. + */ + BuildMon *pbm = &Mybm; + + if (pbm->mfp != NULL && useFilemon) { + filemon_open(pbm); + } else { + pbm->mon_fd = pbm->filemon_fd = -1; + } +#endif + if (pipe(childPipe) < 0) + Punt("Cannot create pipe: %s", strerror(errno)); + /* Set close-on-exec flag for both */ + (void)fcntl(childPipe[0], F_SETFD, 1); + (void)fcntl(childPipe[1], F_SETFD, 1); +} + +void +meta_compat_child(void) +{ + meta_job_child(NULL); + if (dup2(childPipe[1], 1) < 0 || + dup2(1, 2) < 0) { + execError("dup2", "pipe"); + _exit(1); + } +} + +void +meta_compat_parent(void) +{ + FILE *fp; + char buf[BUFSIZ]; + + close(childPipe[1]); /* child side */ + fp = fdopen(childPipe[0], "r"); + while (fgets(buf, sizeof(buf), fp)) { + meta_job_output(NULL, buf, ""); + printf("%s", buf); + } + fclose(fp); +} + +#endif /* USE_META */ |