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freebsd-dev/contrib/bmake/meta.c
Simon J. Gerraty db29cad815 Merge bmake-20150418 
PR: 199486
2015-04-21 04:40:38 +00:00

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/* $NetBSD: meta.c,v 1.38 2015/04/11 05:24:30 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 */
static Lst metaIgnorePaths; /* paths we deliberately ignore */
#ifndef MAKE_META_IGNORE_PATHS
#define MAKE_META_IGNORE_PATHS ".MAKE.META.IGNORE_PATHS"
#endif
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)
{
char buf[BUFSIZ];
int n;
/* 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);
fprintf(mfp, "\n-- filemon acquired metadata --\n");
while ((n = read(fd, buf, sizeof(buf))) > 0) {
fwrite(buf, 1, n, mfp);
}
fflush(mfp);
close(fd);
}
#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(void)
{
#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);
}
/*
* We ignore any paths that start with ${.MAKE.META.IGNORE_PATHS}
*/
metaIgnorePaths = Lst_Init(FALSE);
Var_Append(MAKE_META_IGNORE_PATHS,
"/dev /etc /proc /tmp /var/run /var/tmp ${TMPDIR}", VAR_GLOBAL);
cp = Var_Subst(NULL,
"${" MAKE_META_IGNORE_PATHS ":O:u:tA}", VAR_GLOBAL, 0);
if (cp) {
str2Lst_Append(metaIgnorePaths, 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;
if (job != NULL) {
pbm = &job->bm;
} else {
pbm = &Mybm;
}
if (pbm->mfp != NULL) {
close(fileno(pbm->mfp));
if (useFilemon) {
pid_t pid;
pid = getpid();
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 its meta data file is more recent.
* We have to track the latestdir on a per-process basis.
*/
#define LCWD_VNAME_FMT ".meta.%d.lcwd"
#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; \
}
#define DEQUOTE(p) if (*p == '\'') { \
char *ep; \
p++; \
if ((ep = strchr(p, '\''))) \
*ep = '\0'; \
}
Boolean
meta_oodate(GNode *gn, Boolean oodate)
{
static char *tmpdir = NULL;
static char cwd[MAXPATHLEN];
char lcwd_vname[64];
char ldir_vname[64];
char lcwd[MAXPATHLEN];
char latestdir[MAXPATHLEN];
char fname[MAXPATHLEN];
char fname1[MAXPATHLEN];
char fname2[MAXPATHLEN];
char fname3[MAXPATHLEN];
char *p;
char *cp;
char *link_src;
char *move_target;
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);
}
strlcpy(lcwd, cwd, sizeof(lcwd));
strlcpy(latestdir, cwd, sizeof(latestdir));
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;
}
link_src = NULL;
move_target = NULL;
/* 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 these. */
Var_Set(lcwd_vname, lcwd, VAR_GLOBAL, 0);
Var_Set(ldir_vname, latestdir, VAR_GLOBAL, 0);
}
snprintf(lcwd_vname, sizeof(lcwd_vname), LCWD_VNAME_FMT, pid);
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);
}
ldir = Var_Value(lcwd_vname, VAR_GLOBAL, &tp);
if (ldir) {
strlcpy(lcwd, ldir, sizeof(lcwd));
if (tp)
free(tp);
}
}
/* Skip past the pid. */
if (strsep(&p, " ") == NULL)
continue;
#ifdef DEBUG_META_MODE
if (DEBUG(META))
fprintf(debug_file, "%s: %d: %d: %c: cwd=%s lcwd=%s ldir=%s\n",
fname, lineno,
pid, buf[0], cwd, lcwd, latestdir);
#endif
break;
}
CHECK_VALID_META(p);
/* Process according to record type. */
switch (buf[0]) {
case 'X': /* eXit */
Var_Delete(lcwd_vname, VAR_GLOBAL);
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), LCWD_VNAME_FMT, child);
Var_Set(cldir, lcwd, VAR_GLOBAL, 0);
snprintf(cldir, sizeof(cldir), LDIR_VNAME_FMT, child);
Var_Set(cldir, latestdir, VAR_GLOBAL, 0);
#ifdef DEBUG_META_MODE
if (DEBUG(META))
fprintf(debug_file, "%s: %d: %d: cwd=%s lcwd=%s ldir=%s\n",
fname, lineno,
child, cwd, lcwd, latestdir);
#endif
}
}
break;
case 'C': /* Chdir */
/* Update lcwd and latest directory. */
strlcpy(latestdir, p, sizeof(latestdir));
strlcpy(lcwd, p, sizeof(lcwd));
Var_Set(lcwd_vname, lcwd, VAR_GLOBAL, 0);
Var_Set(ldir_vname, lcwd, VAR_GLOBAL, 0);
#ifdef DEBUG_META_MODE
if (DEBUG(META))
fprintf(debug_file, "%s: %d: cwd=%s ldir=%s\n", fname, lineno, cwd, lcwd);
#endif
break;
case 'M': /* renaMe */
/*
* For 'M'oves we want to check
* the src as for 'R'ead
* and the target as for 'W'rite.
*/
cp = p; /* save this for a second */
/* now get target */
if (strsep(&p, " ") == NULL)
continue;
CHECK_VALID_META(p);
move_target = p;
p = cp;
/* 'L' and 'M' put single quotes around the args */
DEQUOTE(p);
DEQUOTE(move_target);
/* 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 */
}
}
if (buf[0] == 'M') {
/* the target of the mv is a file 'W'ritten */
#ifdef DEBUG_META_MODE
if (DEBUG(META))
fprintf(debug_file, "meta_oodate: M %s -> %s\n",
p, move_target);
#endif
p = move_target;
goto check_write;
}
break;
case 'L': /* Link */
/*
* For 'L'inks check
* the src as for 'R'ead
* and the target as for 'W'rite.
*/
link_src = p;
/* now get target */
if (strsep(&p, " ") == NULL)
continue;
CHECK_VALID_META(p);
/* 'L' and 'M' put single quotes around the args */
DEQUOTE(p);
DEQUOTE(link_src);
#ifdef DEBUG_META_MODE
if (DEBUG(META))
fprintf(debug_file, "meta_oodate: L %s -> %s\n",
link_src, p);
#endif
/* FALLTHROUGH */
case 'W': /* Write */
check_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;
check_link_src:
p = link_src;
link_src = NULL;
#ifdef DEBUG_META_MODE
if (DEBUG(META))
fprintf(debug_file, "meta_oodate: L src %s\n", p);
#endif
/* FALLTHROUGH */
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 (*p == '/' &&
Lst_ForEach(metaIgnorePaths, prefix_match, p)) {
#ifdef DEBUG_META_MODE
if (DEBUG(META))
fprintf(debug_file, "meta_oodate: ignoring: %s\n",
p);
#endif
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, lcwd) != 0) {
/* Check vs lcwd */
snprintf(fname2, sizeof(fname2), "%s/%s", lcwd, p);
sdirs[sdx++] = fname2;
}
if (strcmp(lcwd, cwd) != 0) {
/* Check vs cwd */
snprintf(fname3, sizeof(fname3), "%s/%s", cwd, p);
sdirs[sdx++] = fname3;
}
}
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;
}
}
if (buf[0] == 'E') {
/* previous latestdir is no longer relevant */
strlcpy(latestdir, lcwd, sizeof(latestdir));
}
break;
default:
break;
}
if (!oodate && buf[0] == 'L' && link_src != NULL)
goto check_link_src;
} 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 */
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