/* $NetBSD: meta.c,v 1.215 2025/06/13 06:13:19 rillig Exp $ */
/*
* Implement 'meta' mode.
* Adapted from John Birrell's patches to FreeBSD make.
* --sjg
*/
/*
* Copyright (c) 2009-2016, 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 <libgen.h>
#include <errno.h>
#if !defined(HAVE_CONFIG_H) || defined(HAVE_ERR_H)
#include <err.h>
#endif
#include "make.h"
#include "dir.h"
#include "job.h"
#include "meta.h"
#ifdef USE_FILEMON
#include "filemon/filemon.h"
#endif
static BuildMon Mybm; /* for compat */
static StringList metaBailiwick = LST_INIT; /* our scope of control */
static char *metaBailiwickStr; /* string storage for the list */
static StringList metaIgnorePaths = LST_INIT; /* paths we deliberately ignore */
static char *metaIgnorePathsStr; /* string storage for the list */
#ifndef MAKE_META_IGNORE_PATHS
#define MAKE_META_IGNORE_PATHS ".MAKE.META.IGNORE_PATHS"
#endif
#ifndef MAKE_META_IGNORE_PATTERNS
#define MAKE_META_IGNORE_PATTERNS ".MAKE.META.IGNORE_PATTERNS"
#endif
#ifndef MAKE_META_IGNORE_FILTER
#define MAKE_META_IGNORE_FILTER ".MAKE.META.IGNORE_FILTER"
#endif
#ifndef MAKE_META_CMP_FILTER
#define MAKE_META_CMP_FILTER ".MAKE.META.CMP_FILTER"
#endif
bool useMeta = false;
static bool useFilemon = false;
static bool writeMeta = false;
static bool metaMissing = false; /* oodate if missing */
static bool filemonMissing = false; /* oodate if missing */
static bool metaEnv = false; /* don't save env unless asked */
static bool metaVerbose = false;
static bool metaIgnoreCMDs = false; /* ignore CMDs in .meta files */
static bool metaIgnorePatterns = false; /* do we need to do pattern matches */
static bool metaIgnoreFilter = false; /* do we have more complex filtering? */
static bool metaCmpFilter = false; /* do we have CMP_FILTER ? */
static bool metaCurdirOk = false; /* write .meta in .CURDIR Ok? */
static bool metaSilent = false; /* if we have a .meta be SILENT */
#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
/*
* Open the filemon device.
*/
static void
meta_open_filemon(BuildMon *pbm)
{
int dupfd;
pbm->mon_fd = -1;
pbm->filemon = NULL;
if (!useFilemon || pbm->mfp == NULL)
return;
pbm->filemon = filemon_open();
if (pbm->filemon == NULL) {
useFilemon = false;
warn("Could not open filemon %s", filemon_path());
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.
*/
if (!opts.compatMake)
pbm->mon_fd = Job_TempFile("filemon.XXXXXX", NULL, 0);
else
pbm->mon_fd = mkTempFile("filemon.XXXXXX", NULL, 0);
if ((dupfd = dup(pbm->mon_fd)) == -1) {
Punt("Could not dup filemon output: %s", strerror(errno));
}
(void)fcntl(dupfd, F_SETFD, FD_CLOEXEC);
if (filemon_setfd(pbm->filemon, dupfd) == -1) {
Punt("Could not set filemon file descriptor: %s", strerror(errno));
}
/* we don't need these once we exec */
(void)fcntl(pbm->mon_fd, F_SETFD, FD_CLOEXEC);
}
/*
* Read the build monitor output file and write records to the target's
* metadata file.
*/
static int
filemon_read(FILE *mfp, int fd)
{
char buf[BUFSIZ];
int error;
/* Check if we're not writing to a meta data file.*/
if (mfp == NULL) {
if (fd >= 0)
close(fd); /* not interested */
return 0;
}
/* rewind */
if (lseek(fd, (off_t)0, SEEK_SET) < 0) {
error = errno;
warn("Could not rewind filemon");
fprintf(mfp, "\n");
} else {
ssize_t n;
error = 0;
fprintf(mfp, "\n-- filemon acquired metadata --\n");
while ((n = read(fd, buf, sizeof buf)) > 0) {
if ((ssize_t)fwrite(buf, 1, (size_t)n, mfp) < n)
error = EIO;
}
}
if (fflush(mfp) != 0)
Punt("Cannot write filemon data to meta file: %s",
strerror(errno));
if (close(fd) < 0)
error = errno;
return error;
}
#endif
/*
* when realpath() fails,
* we use this, to clean up ./ and ../
*/
static void
eat_dots(char *buf)
{
char *p;
while ((p = strstr(buf, "/./")) != NULL)
memmove(p, p + 2, strlen(p + 2) + 1);
while ((p = strstr(buf, "/../")) != NULL) {
char *p2 = p + 3;
if (p > buf) {
do {
p--;
} while (p > buf && *p != '/');
}
if (*p == '/')
memmove(p, p2, strlen(p2) + 1);
else
return; /* can't happen? */
}
}
static char *
meta_name(char *mname, size_t mnamelen,
const char *dname,
const char *tname,
const char *cwd)
{
char buf[MAXPATHLEN];
char *rp, *cp;
const char *tname_base;
char *tp;
char *dtp;
size_t ldname;
/*
* 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 ((tname_base = strrchr(tname, '/')) != NULL) {
if (cached_realpath(tname, buf) != NULL) {
if ((rp = strrchr(buf, '/')) != NULL) {
rp++;
tname_base++;
if (strcmp(tname_base, rp) != 0)
strlcpy(rp, tname_base, sizeof buf - (size_t)(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);
tname = buf;
}
}
/* on some systems dirname may modify its arg */
tp = bmake_strdup(tname);
dtp = dirname(tp);
if (strcmp(dname, dtp) == 0) {
if (snprintf(mname, mnamelen, "%s.meta", tname) >= (int)mnamelen)
mname[mnamelen - 1] = '\0';
} else {
int x;
ldname = strlen(dname);
if (strncmp(dname, dtp, ldname) == 0 && dtp[ldname] == '/')
x = snprintf(mname, mnamelen, "%s/%s.meta", dname, &tname[ldname+1]);
else
x = snprintf(mname, mnamelen, "%s/%s.meta", dname, tname);
if (x >= (int)mnamelen)
mname[mnamelen - 1] = '\0';
/*
* 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);
return mname;
}
/*
* Return true if running ${.MAKE}
* Bypassed if target is flagged .MAKE
*/
static bool
is_submake(const char *cmd, GNode *gn)
{
static const char *p_make = NULL;
static size_t p_len;
char *mp = NULL;
const char *cp2;
bool rc = false;
if (p_make == NULL) {
p_make = Var_Value(gn, ".MAKE").str;
p_len = strlen(p_make);
}
if (strchr(cmd, '$') != NULL) {
mp = Var_Subst(cmd, gn, VARE_EVAL);
/* TODO: handle errors */
cmd = mp;
}
cp2 = strstr(cmd, p_make);
if (cp2 != NULL) {
switch (cp2[p_len]) {
case '\0':
case ' ':
case '\t':
case '\n':
rc = true;
break;
}
if (cp2 > cmd && rc) {
switch (cp2[-1]) {
case ' ':
case '\t':
case '\n':
break;
default:
rc = false; /* no match */
break;
}
}
}
free(mp);
return rc;
}
static bool
any_is_submake(GNode *gn)
{
StringListNode *ln;
for (ln = gn->commands.first; ln != NULL; ln = ln->next)
if (is_submake(ln->datum, gn))
return true;
return false;
}
static void
printCMD(const char *ucmd, FILE *fp, GNode *gn)
{
FStr xcmd = FStr_InitRefer(ucmd);
Var_Expand(&xcmd, gn, VARE_EVAL);
fprintf(fp, "CMD %s\n", xcmd.str);
FStr_Done(&xcmd);
}
static void
printCMDs(GNode *gn, FILE *fp)
{
StringListNode *ln;
for (ln = gn->commands.first; ln != NULL; ln = ln->next)
printCMD(ln->datum, fp, gn);
}
/*
* Certain node types never get a .meta file
*/
#define SKIP_META_TYPE(flag, str) do { \
if ((gn->type & (flag))) { \
if (verbose) \
debug_printf("Skipping meta for %s: .%s\n", gn->name, str); \
return false; \
} \
} while (false)
/*
* Do we need/want a .meta file ?
*/
static bool
meta_needed(GNode *gn, const char *dname,
char *objdir_realpath, bool verbose)
{
struct cached_stat cst;
if (verbose)
verbose = DEBUG(META);
/* 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(OP_NOMETA, "NOMETA");
/* Unless it is explicitly flagged as .META */
if (!(gn->type & OP_META)) {
SKIP_META_TYPE(OP_PHONY, "PHONY");
SKIP_META_TYPE(OP_SPECIAL, "SPECIAL");
SKIP_META_TYPE(OP_MAKE, "MAKE");
}
/* Check if there are no commands to execute. */
if (Lst_IsEmpty(&gn->commands)) {
if (verbose)
debug_printf("Skipping meta for %s: no commands\n", gn->name);
return false;
}
if ((gn->type & (OP_META|OP_SUBMAKE)) == OP_SUBMAKE) {
/* OP_SUBMAKE is a bit too aggressive */
if (any_is_submake(gn)) {
DEBUG1(META, "Skipping meta for %s: .SUBMAKE\n", gn->name);
return false;
}
}
/* The object directory may not exist. Check it.. */
if (cached_stat(dname, &cst) != 0) {
if (verbose)
debug_printf("Skipping meta for %s: no .OBJDIR\n", gn->name);
return false;
}
/* make sure these are canonical */
if (cached_realpath(dname, objdir_realpath) != NULL)
dname = objdir_realpath;
/* If we aren't in the object directory, don't create a meta file. */
if (!metaCurdirOk && strcmp(curdir, dname) == 0) {
if (verbose)
debug_printf("Skipping meta for %s: .OBJDIR == .CURDIR\n",
gn->name);
return false;
}
return true;
}
static FILE *
meta_create(BuildMon *pbm, GNode *gn)
{
FILE *fp;
char buf[MAXPATHLEN];
char objdir_realpath[MAXPATHLEN];
char **ptr;
FStr dname;
const char *tname;
char *fname;
const char *cp;
fp = NULL;
dname = Var_Value(gn, ".OBJDIR");
tname = GNode_VarTarget(gn);
/* if this succeeds objdir_realpath is realpath of dname */
if (!meta_needed(gn, dname.str, objdir_realpath, true))
goto out;
dname.str = objdir_realpath;
if (metaVerbose) {
/* Describe the target we are building */
char *mp = Var_Subst("${" MAKE_META_PREFIX "}", gn, VARE_EVAL);
/* TODO: handle errors */
if (mp[0] != '\0')
fprintf(stdout, "%s\n", mp);
free(mp);
}
/* Get the basename of the target */
cp = str_basename(tname);
fflush(stdout);
if (!writeMeta)
/* Don't create meta data. */
goto out;
fname = meta_name(pbm->meta_fname, sizeof pbm->meta_fname,
dname.str, tname, objdir_realpath);
#ifdef DEBUG_META_MODE
DEBUG1(META, "meta_create: %s\n", fname);
#endif
if ((fp = fopen(fname, "w")) == NULL)
Punt("Could not open meta file '%s': %s", fname, strerror(errno));
fprintf(fp, "# Meta data file %s\n", fname);
printCMDs(gn, fp);
fprintf(fp, "CWD %s\n", getcwd(buf, sizeof buf));
fprintf(fp, "TARGET %s\n", tname);
cp = GNode_VarOodate(gn);
if (cp != NULL && *cp != '\0') {
fprintf(fp, "OODATE %s\n", cp);
}
if (metaEnv) {
for (ptr = environ; *ptr != NULL; ptr++)
fprintf(fp, "ENV %s\n", *ptr);
}
fprintf(fp, "-- command output --\n");
if (fflush(fp) != 0)
Punt("Cannot write expanded command to meta file: %s",
strerror(errno));
Global_Append(".MAKE.META.FILES", fname);
Global_Append(".MAKE.META.CREATED", fname);
gn->type |= OP_META; /* in case anyone wants to know */
if (metaSilent) {
gn->type |= OP_SILENT;
}
out:
FStr_Done(&dname);
return fp;
}
static bool
boolValue(const 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 */
Global_Set(".MAKE.PATH_FILEMON", filemon_path());
#endif
}
#define get_mode_bf(bf, token) \
if ((cp = strstr(make_mode, token)) != NULL) \
bf = boolValue(cp + sizeof (token) - 1)
/*
* Initialization we need after reading makefiles.
*/
void
meta_mode_init(const char *make_mode)
{
static bool once = false;
const char *cp;
useMeta = true;
useFilemon = true;
writeMeta = true;
if (make_mode != NULL) {
if (strstr(make_mode, "env") != NULL)
metaEnv = true;
if (strstr(make_mode, "verb") != NULL)
metaVerbose = true;
if (strstr(make_mode, "read") != NULL)
writeMeta = false;
if (strstr(make_mode, "nofilemon") != NULL)
useFilemon = false;
if (strstr(make_mode, "ignore-cmd") != NULL)
metaIgnoreCMDs = true;
if (useFilemon)
get_mode_bf(filemonMissing, "missing-filemon=");
get_mode_bf(metaCurdirOk, "curdirok=");
get_mode_bf(metaMissing, "missing-meta=");
get_mode_bf(metaSilent, "silent=");
}
if (metaVerbose && !Var_Exists(SCOPE_GLOBAL, MAKE_META_PREFIX)) {
/*
* 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.
*/
Global_Set(MAKE_META_PREFIX,
"Building ${.TARGET:H:tA}/${.TARGET:T}");
}
if (once)
return;
once = true;
memset(&Mybm, 0, sizeof Mybm);
/*
* We consider ourselves master of all within ${.MAKE.META.BAILIWICK}
*/
metaBailiwickStr = Var_Subst("${.MAKE.META.BAILIWICK:O:u:tA}",
SCOPE_GLOBAL, VARE_EVAL);
/* TODO: handle errors */
AppendWords(&metaBailiwick, metaBailiwickStr);
/*
* We ignore any paths that start with ${.MAKE.META.IGNORE_PATHS}
*/
Global_Append(MAKE_META_IGNORE_PATHS,
"/dev /etc /proc /tmp /var/run /var/tmp ${TMPDIR}");
metaIgnorePathsStr = Var_Subst("${" MAKE_META_IGNORE_PATHS ":O:u:tA}",
SCOPE_GLOBAL, VARE_EVAL);
/* TODO: handle errors */
AppendWords(&metaIgnorePaths, metaIgnorePathsStr);
/*
* We ignore any paths that match ${.MAKE.META.IGNORE_PATTERNS}
*/
metaIgnorePatterns = Var_Exists(SCOPE_GLOBAL, MAKE_META_IGNORE_PATTERNS);
metaIgnoreFilter = Var_Exists(SCOPE_GLOBAL, MAKE_META_IGNORE_FILTER);
metaCmpFilter = Var_Exists(SCOPE_GLOBAL, MAKE_META_CMP_FILTER);
}
MAKE_INLINE BuildMon *
BM(Job *job)
{
return job != NULL ? Job_BuildMon(job) : &Mybm;
}
/*
* In each case below we allow for job==NULL
*/
void
meta_job_start(Job *job, GNode *gn)
{
BuildMon *pbm;
pbm = BM(job);
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) {
meta_open_filemon(pbm);
} else {
pbm->mon_fd = -1;
pbm->filemon = NULL;
}
#endif
}
/*
* The child calls this before doing anything.
* It does not disturb our state.
*/
void
meta_job_child(Job *job MAKE_ATTR_UNUSED)
{
#ifdef USE_FILEMON
BuildMon *pbm;
pbm = BM(job);
if (pbm->mfp != NULL) {
close(fileno(pbm->mfp));
if (useFilemon && pbm->filemon != NULL) {
pid_t pid;
pid = getpid();
if (filemon_setpid_child(pbm->filemon, pid) == -1) {
Punt("Could not set filemon pid: %s", strerror(errno));
}
}
}
#endif
}
void
meta_job_parent(Job *job MAKE_ATTR_UNUSED, pid_t pid MAKE_ATTR_UNUSED)
{
#if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV)
BuildMon *pbm;
pbm = BM(job);
if (useFilemon && pbm->filemon != NULL) {
filemon_setpid_parent(pbm->filemon, pid);
}
#endif
}
int
meta_job_fd(Job *job MAKE_ATTR_UNUSED)
{
#if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV)
BuildMon *pbm;
pbm = BM(job);
if (useFilemon && pbm->filemon != NULL) {
return filemon_readfd(pbm->filemon);
}
#endif
return -1;
}
int
meta_job_event(Job *job MAKE_ATTR_UNUSED)
{
#if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV)
BuildMon *pbm;
pbm = BM(job);
if (useFilemon && pbm->filemon != NULL) {
return filemon_process(pbm->filemon);
}
#endif
return 0;
}
void
meta_job_error(Job *job, GNode *gn, bool ignerr, int status)
{
char cwd[MAXPATHLEN];
BuildMon *pbm;
pbm = BM(job);
if (job != NULL && gn == NULL)
gn = Job_Node(job);
if (pbm->mfp != NULL) {
fprintf(pbm->mfp, "\n*** Error code %d%s\n",
status, ignerr ? "(ignored)" : "");
}
if (gn != NULL)
Global_Set(".ERROR_TARGET", GNode_Path(gn));
if (getcwd(cwd, sizeof cwd) == NULL)
Punt("getcwd: %s", strerror(errno));
Global_Set(".ERROR_CWD", cwd);
if (pbm->meta_fname[0] != '\0') {
Global_Set(".ERROR_META_FILE", pbm->meta_fname);
}
meta_job_finish(job);
}
void
meta_job_output(Job *job, const char *cp)
{
BuildMon *pbm;
pbm = BM(job);
if (pbm->mfp != NULL) {
if (metaVerbose) {
static char *meta_prefix = NULL;
static size_t meta_prefix_len;
if (meta_prefix == NULL) {
meta_prefix = Var_Subst("${" MAKE_META_PREFIX "}",
SCOPE_GLOBAL, VARE_EVAL);
/* TODO: handle errors */
meta_prefix_len = strcspn(meta_prefix, "$");
}
if (strncmp(cp, meta_prefix, meta_prefix_len) == 0) {
cp = strchr(cp + 1, '\n');
if (cp == NULL)
return;
cp++;
}
}
fprintf(pbm->mfp, "%s", cp);
}
}
int
meta_cmd_finish(void *pbmp)
{
int error = 0;
BuildMon *pbm = pbmp;
#ifdef USE_FILEMON
int x;
#endif
if (pbm == NULL)
pbm = &Mybm;
#ifdef USE_FILEMON
if (pbm->filemon != NULL) {
while (filemon_process(pbm->filemon) > 0)
continue;
if (filemon_close(pbm->filemon) == -1) {
error = errno;
Punt("filemon failed: %s", strerror(errno));
}
x = filemon_read(pbm->mfp, pbm->mon_fd);
if (error == 0 && x != 0)
error = x;
pbm->mon_fd = -1;
pbm->filemon = NULL;
return error;
}
#endif
fprintf(pbm->mfp, "\n"); /* ensure end with newline */
return error;
}
int
meta_job_finish(Job *job)
{
BuildMon *pbm;
int error = 0;
int x;
pbm = BM(job);
if (pbm->mfp != NULL) {
error = meta_cmd_finish(pbm);
x = fclose(pbm->mfp);
if (error == 0 && x != 0)
error = errno;
pbm->mfp = NULL;
pbm->meta_fname[0] = '\0';
}
return error;
}
void
meta_finish(void)
{
Lst_Done(&metaBailiwick);
free(metaBailiwickStr);
Lst_Done(&metaIgnorePaths);
free(metaIgnorePathsStr);
}
/*
* 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], (int)bufsz - o, fp) != NULL) {
check_newline:
x = o + (int)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(((size_t)fs.st_size / 2), BUFSIZ);
if (newsz <= bufsz)
newsz = ROUNDUP((size_t)fs.st_size, BUFSIZ);
if (newsz <= bufsz)
return x; /* truncated */
DEBUG2(META, "growing buffer %u -> %u\n",
(unsigned)bufsz, (unsigned)newsz);
p = bmake_realloc(buf, newsz);
*bufp = buf = p;
*szp = bufsz = newsz;
/* fetch the rest */
if (fgets(&buf[x], (int)bufsz - x, fp) == NULL)
return x; /* truncated! */
goto check_newline;
}
}
return 0;
}
static bool
prefix_match(const char *prefix, const char *path)
{
size_t n = strlen(prefix);
return strncmp(path, prefix, n) == 0;
}
static bool
has_any_prefix(const char *path, StringList *prefixes)
{
StringListNode *ln;
for (ln = prefixes->first; ln != NULL; ln = ln->next)
if (prefix_match(ln->datum, path))
return true;
return false;
}
/* See if the path equals prefix or starts with "prefix/". */
static bool
path_starts_with(const char *path, const char *prefix)
{
size_t n = strlen(prefix);
if (strncmp(path, prefix, n) != 0)
return false;
return path[n] == '\0' || path[n] == '/';
}
static bool
meta_ignore(GNode *gn, const char *p)
{
char fname[MAXPATHLEN];
if (p == NULL)
return true;
if (*p == '/') {
/* first try the raw path "as is" */
if (has_any_prefix(p, &metaIgnorePaths)) {
#ifdef DEBUG_META_MODE
DEBUG1(META, "meta_oodate: ignoring path: %s\n", p);
#endif
return true;
}
cached_realpath(p, fname); /* clean it up */
if (has_any_prefix(fname, &metaIgnorePaths)) {
#ifdef DEBUG_META_MODE
DEBUG1(META, "meta_oodate: ignoring path: %s\n", p);
#endif
return true;
}
}
if (metaIgnorePatterns) {
const char *expr;
char *pm;
/*
* XXX: This variable is set on a target GNode but is not one of
* the usual local variables. It should be deleted afterwards.
* Ideally it would not be created in the first place, just like
* in a .for loop.
*/
Var_Set(gn, ".p.", p);
expr = "${" MAKE_META_IGNORE_PATTERNS ":@m@${.p.:M$m}@}";
pm = Var_Subst(expr, gn, VARE_EVAL);
/* TODO: handle errors */
if (pm[0] != '\0') {
#ifdef DEBUG_META_MODE
DEBUG1(META, "meta_oodate: ignoring pattern: %s\n", p);
#endif
free(pm);
return true;
}
free(pm);
}
if (metaIgnoreFilter) {
char *fm;
/* skip if filter result is empty */
snprintf(fname, sizeof fname,
"${%s:L:${%s:ts:}}",
p, MAKE_META_IGNORE_FILTER);
fm = Var_Subst(fname, gn, VARE_EVAL);
/* TODO: handle errors */
if (*fm == '\0') {
#ifdef DEBUG_META_MODE
DEBUG1(META, "meta_oodate: ignoring filtered: %s\n", p);
#endif
free(fm);
return true;
}
free(fm);
}
return false;
}
/*
* 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 != NULL && *p != '\0')) { \
warnx("%s:%u: malformed", fname, lineno); \
oodate = true; \
continue; \
}
#define DEQUOTE(p) if (*p == '\'') { \
char *ep; \
p++; \
if ((ep = strchr(p, '\'')) != NULL) \
*ep = '\0'; \
}
static void
append_if_new(StringList *list, const char *str)
{
StringListNode *ln;
for (ln = list->first; ln != NULL; ln = ln->next)
if (strcmp(ln->datum, str) == 0)
return;
Lst_Append(list, bmake_strdup(str));
}
/* A "reserved" variable to store the command to be filtered */
#define META_CMD_FILTER_VAR ".MAKE.cmd_filtered"
static char *
meta_filter_cmd(GNode *gn, char *s)
{
Var_Set(gn, META_CMD_FILTER_VAR, s);
s = Var_Subst(
"${" META_CMD_FILTER_VAR ":${" MAKE_META_CMP_FILTER ":ts:}}",
gn, VARE_EVAL);
return s;
}
static int
meta_cmd_cmp(GNode *gn, char *a, char *b, bool filter)
{
int rc;
rc = strcmp(a, b);
if (rc == 0 || !filter)
return rc;
a = meta_filter_cmd(gn, a);
b = meta_filter_cmd(gn, b);
rc = strcmp(a, b);
free(a);
free(b);
Var_Delete(gn, META_CMD_FILTER_VAR);
return rc;
}
bool
meta_oodate(GNode *gn, bool 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];
FStr dname;
const char *tname;
char *p;
char *link_src;
char *move_target;
static size_t cwdlen = 0;
static size_t tmplen = 0;
FILE *fp;
bool needOODATE = false;
StringList missingFiles;
bool have_filemon = false;
bool cmp_filter;
if (oodate)
return oodate; /* we're done */
dname = Var_Value(gn, ".OBJDIR");
tname = GNode_VarTarget(gn);
/* if this succeeds fname3 is realpath of dname */
if (!meta_needed(gn, dname.str, fname3, false))
goto oodate_out;
dname.str = fname3;
Lst_Init(&missingFiles);
/*
* 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.
*/
GNode_SetLocalVars(gn);
meta_name(fname, sizeof fname, dname.str, tname, dname.str);
#ifdef DEBUG_META_MODE
DEBUG1(META, "meta_oodate: %s\n", fname);
#endif
if ((fp = fopen(fname, "r")) != NULL) {
static char *buf = NULL;
static size_t bufsz;
unsigned lineno = 0;
int lastpid = 0;
int pid;
int x;
StringListNode *cmdNode;
struct cached_stat cst;
if (buf == NULL) {
bufsz = 8 * BUFSIZ;
buf = bmake_malloc(bufsz);
}
if (cwdlen == 0) {
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 == NULL) {
tmpdir = getTmpdir();
tmplen = strlen(tmpdir);
}
/* we want to track all the .meta we read */
Global_Append(".MAKE.META.FILES", fname);
cmp_filter = metaCmpFilter || Var_Exists(gn, MAKE_META_CMP_FILTER);
cmdNode = gn->commands.first;
while (!oodate && (x = fgetLine(&buf, &bufsz, 0, fp)) > 0) {
lineno++;
if (buf[x - 1] == '\n')
buf[x - 1] = '\0';
else {
warnx("%s:%u: 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 (!have_filemon) {
if (strncmp(buf, "-- filemon", 10) == 0) {
have_filemon = true;
continue;
}
if (strncmp(buf, "# buildmon", 10) == 0) {
have_filemon = true;
continue;
}
}
/* Delimit the record type. */
p = buf;
#ifdef DEBUG_META_MODE
DEBUG3(META, "%s:%u: %s\n", fname, lineno, buf);
#endif
strsep(&p, " ");
if (have_filemon) {
/*
* 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) {
FStr ldir;
if (lastpid > 0) {
/* We need to remember these. */
Global_Set(lcwd_vname, lcwd);
Global_Set(ldir_vname, latestdir);
}
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(SCOPE_GLOBAL, ldir_vname);
if (ldir.str != NULL) {
strlcpy(latestdir, ldir.str, sizeof latestdir);
FStr_Done(&ldir);
}
ldir = Var_Value(SCOPE_GLOBAL, lcwd_vname);
if (ldir.str != NULL) {
strlcpy(lcwd, ldir.str, sizeof lcwd);
FStr_Done(&ldir);
}
}
/* Skip past the pid. */
if (strsep(&p, " ") == NULL)
continue;
#ifdef DEBUG_META_MODE
if (DEBUG(META))
debug_printf("%s:%u: %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(SCOPE_GLOBAL, lcwd_vname);
Var_Delete(SCOPE_GLOBAL, ldir_vname);
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);
Global_Set(cldir, lcwd);
snprintf(cldir, sizeof cldir, LDIR_VNAME_FMT, child);
Global_Set(cldir, latestdir);
#ifdef DEBUG_META_MODE
if (DEBUG(META))
debug_printf(
"%s:%u: %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);
Global_Set(lcwd_vname, lcwd);
Global_Set(ldir_vname, lcwd);
#ifdef DEBUG_META_MODE
DEBUG4(META, "%s:%u: 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.
*/
{
char *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 == '/') {
/* remove any missingFiles entries that match p */
StringListNode *ln = missingFiles.first;
while (ln != NULL) {
StringListNode *next = ln->next;
if (path_starts_with(ln->datum, p)) {
free(ln->datum);
Lst_Remove(&missingFiles, ln);
}
ln = next;
}
}
if (buf[0] == 'M') {
/* the target of the mv is a file 'W'ritten */
#ifdef DEBUG_META_MODE
DEBUG2(META, "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
DEBUG2(META, "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 (!has_any_prefix(p, &metaBailiwick))
break;
/* tmpdir might be within */
if (tmplen > 0 && strncmp(p, tmpdir, tmplen) == 0)
break;
/* ignore anything containing the string "tmp" */
/* XXX: The arguments to strstr must be swapped. */
if (strstr("tmp", p) != NULL)
break;
if ((link_src != NULL && cached_lstat(p, &cst) < 0) ||
(link_src == NULL && cached_stat(p, &cst) < 0)) {
if (!meta_ignore(gn, p))
append_if_new(&missingFiles, p);
}
break;
check_link_src:
p = link_src;
link_src = NULL;
#ifdef DEBUG_META_MODE
DEBUG1(META, "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 (meta_ignore(gn, p))
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;
bool found = false;
if (*p == '/') {
sdirs[sdx++] = p; /* done */
} else {
if (strcmp(".", p) == 0)
continue; /* no point */
/* Check vs latestdir */
if (snprintf(fname1, sizeof fname1, "%s/%s", latestdir, p) < (int)(sizeof fname1))
sdirs[sdx++] = fname1;
if (strcmp(latestdir, lcwd) != 0) {
/* Check vs lcwd */
if (snprintf(fname2, sizeof fname2, "%s/%s", lcwd, p) < (int)(sizeof fname2))
sdirs[sdx++] = fname2;
}
if (strcmp(lcwd, cwd) != 0) {
/* Check vs cwd */
if (snprintf(fname3, sizeof fname3, "%s/%s", cwd, p) < (int)(sizeof fname3))
sdirs[sdx++] = fname3;
}
}
sdirs[sdx++] = NULL;
for (sdp = sdirs; *sdp != NULL && !found; sdp++) {
#ifdef DEBUG_META_MODE
DEBUG3(META, "%s:%u: looking for: %s\n",
fname, lineno, *sdp);
#endif
if (cached_stat(*sdp, &cst) == 0) {
found = true;
p = *sdp;
}
}
if (found) {
#ifdef DEBUG_META_MODE
DEBUG3(META, "%s:%u: found: %s\n",
fname, lineno, p);
#endif
if (!S_ISDIR(cst.cst_mode) &&
cst.cst_mtime > gn->mtime) {
DEBUG3(META, "%s:%u: file '%s' is newer than the target...\n",
fname, lineno, p);
oodate = true;
} else if (S_ISDIR(cst.cst_mode)) {
/* Update the latest directory. */
cached_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...
*/
append_if_new(&missingFiles, p);
}
}
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 (cmdNode == NULL) {
DEBUG2(META, "%s:%u: there were more build commands in the meta data file than there are now...\n",
fname, lineno);
oodate = true;
} else {
const char *cp;
char *cmd = cmdNode->datum;
bool hasOODATE = false;
if (strstr(cmd, "$?") != NULL)
hasOODATE = true;
else if ((cp = strstr(cmd, ".OODATE")) != NULL) {
/* check for $[{(].OODATE[:)}] */
if (cp > cmd + 2 && cp[-2] == '$')
hasOODATE = true;
}
if (hasOODATE) {
needOODATE = true;
DEBUG2(META, "%s:%u: cannot compare command using .OODATE\n",
fname, lineno);
}
cmd = Var_Subst(cmd, gn, VARE_EVAL_DEFINED);
/* TODO: handle errors */
if ((cp = strchr(cmd, '\n')) != NULL) {
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:%u: line truncated at %u", fname, lineno, x);
break;
}
cp = strchr(cp + 1, '\n');
} while (cp != NULL);
if (buf[x - 1] == '\n')
buf[x - 1] = '\0';
}
if (p != NULL &&
!hasOODATE &&
!(gn->type & OP_NOMETA_CMP) &&
(meta_cmd_cmp(gn, p, cmd, cmp_filter) != 0)) {
DEBUG4(META, "%s:%u: a build command has changed\n%s\nvs\n%s\n",
fname, lineno, p, cmd);
if (!metaIgnoreCMDs)
oodate = true;
}
free(cmd);
cmdNode = cmdNode->next;
}
} else if (strcmp(buf, "CWD") == 0) {
/*
* Check if there are extra commands now
* that weren't in the meta data file.
*/
if (!oodate && cmdNode != NULL) {
DEBUG2(META, "%s:%u: there are extra build commands now that weren't in the meta data file\n",
fname, lineno);
oodate = true;
}
CHECK_VALID_META(p);
if (strcmp(p, cwd) != 0) {
DEBUG4(META, "%s:%u: the current working directory has changed from '%s' to '%s'\n",
fname, lineno, p, curdir);
oodate = true;
}
}
}
fclose(fp);
if (!Lst_IsEmpty(&missingFiles)) {
DEBUG2(META, "%s: missing files: %s...\n",
fname, (char *)missingFiles.first->datum);
oodate = true;
}
if (!oodate && !have_filemon && filemonMissing) {
DEBUG1(META, "%s: missing filemon data\n", fname);
oodate = true;
}
} else {
if (writeMeta && (metaMissing || (gn->type & OP_META))) {
const char *cp = NULL;
/* if target is in .CURDIR we do not need a meta file */
if (gn->path != NULL && (cp = strrchr(gn->path, '/')) != NULL &&
(cp > gn->path)) {
if (strncmp(curdir, gn->path, (size_t)(cp - gn->path)) != 0) {
cp = NULL; /* not in .CURDIR */
}
}
if (cp == NULL) {
DEBUG1(META, "%s: required but missing\n", fname);
oodate = true;
needOODATE = true; /* assume the worst */
}
}
}
Lst_DoneFree(&missingFiles);
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(gn, OODATE);
Var_Set(gn, OODATE, GNode_VarAllsrc(gn));
}
oodate_out:
FStr_Done(&dname);
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) {
meta_open_filemon(pbm);
} else {
pbm->mon_fd = -1;
pbm->filemon = NULL;
}
#endif
if (pipe(childPipe) < 0)
Punt("pipe: %s", strerror(errno));
/* Set close-on-exec flag for both */
(void)fcntl(childPipe[0], F_SETFD, FD_CLOEXEC);
(void)fcntl(childPipe[1], F_SETFD, FD_CLOEXEC);
}
void
meta_compat_child(void)
{
meta_job_child(NULL);
if (dup2(childPipe[1], STDOUT_FILENO) < 0
|| dup2(STDOUT_FILENO, STDERR_FILENO) < 0)
execDie("dup2", "pipe");
}
void
meta_compat_parent(pid_t child)
{
int outfd, metafd, maxfd, nfds;
char buf[BUFSIZ+1];
fd_set readfds;
meta_job_parent(NULL, child);
close(childPipe[1]); /* child side */
outfd = childPipe[0];
#ifdef USE_FILEMON
metafd = Mybm.filemon != NULL ? filemon_readfd(Mybm.filemon) : -1;
#else
metafd = -1;
#endif
maxfd = -1;
if (outfd > maxfd)
maxfd = outfd;
if (metafd > maxfd)
maxfd = metafd;
while (outfd != -1 || metafd != -1) {
FD_ZERO(&readfds);
if (outfd != -1) {
FD_SET(outfd, &readfds);
}
if (metafd != -1) {
FD_SET(metafd, &readfds);
}
nfds = select(maxfd + 1, &readfds, NULL, NULL, NULL);
if (nfds == -1) {
if (errno == EINTR)
continue;
err(1, "select");
}
if (outfd != -1 && FD_ISSET(outfd, &readfds) != 0) do {
/* XXX this is not line-buffered */
ssize_t nread = read(outfd, buf, sizeof buf - 1);
if (nread == -1)
err(1, "read");
if (nread == 0) {
close(outfd);
outfd = -1;
break;
}
fwrite(buf, 1, (size_t)nread, stdout);
fflush(stdout);
buf[nread] = '\0';
meta_job_output(NULL, buf);
} while (false);
if (metafd != -1 && FD_ISSET(metafd, &readfds) != 0) {
if (meta_job_event(NULL) <= 0)
metafd = -1;
}
}
}
#endif /* USE_META */
