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redo.c
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redo.c
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/* An implementation of the redo build system
in portable C with zero dependencies
http://cr.yp.to/redo.html
https://jdebp.info/FGA/introduction-to-redo.html
https://github.com/apenwarr/redo/blob/master/README.md
http://news.dieweltistgarnichtso.net/bin/redo-sh.html
To the extent possible under law,
Leah Neukirchen <[email protected]>
has waived all copyright and related or neighboring rights to this work.
http://creativecommons.org/publicdomain/zero/1.0/
*/
/************************************************************
This redo-c version can be found at:
https://github.com/AndreyDobrovolskyOdessa/redo-c
which is the fork of:
https://github.com/leahneukirchen/redo-c
Features:
1. Optimized recipes envocations.
2. Dependency loops detected during parallel builds.
3. Build log is Lua table.
Andrey Dobrovolsky <[email protected]>
************************************************************/
#define _GNU_SOURCE 1
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
/* ------------------------------------------------------------------------- */
/* from musl/src/crypt/crypt_sha256.c */
/* public domain sha256 implementation based on fips180-3 */
struct sha256 {
uint64_t len; /* processed message length */
uint32_t h[8]; /* hash state */
uint8_t buf[64]; /* message block buffer */
};
static uint32_t ror(uint32_t n, int k) { return (n >> k) | (n << (32-k)); }
#define Ch(x,y,z) (z ^ (x & (y ^ z)))
#define Maj(x,y,z) ((x & y) | (z & (x | y)))
#define S0(x) (ror(x,2) ^ ror(x,13) ^ ror(x,22))
#define S1(x) (ror(x,6) ^ ror(x,11) ^ ror(x,25))
#define R0(x) (ror(x,7) ^ ror(x,18) ^ (x>>3))
#define R1(x) (ror(x,17) ^ ror(x,19) ^ (x>>10))
static const uint32_t K[64] = {
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
};
static void processblock(struct sha256 *s, const uint8_t *buf)
{
uint32_t W[64], t1, t2, a, b, c, d, e, f, g, h;
int i;
for (i = 0; i < 16; i++) {
W[i] = (uint32_t)buf[4*i]<<24;
W[i] |= (uint32_t)buf[4*i+1]<<16;
W[i] |= (uint32_t)buf[4*i+2]<<8;
W[i] |= buf[4*i+3];
}
for (; i < 64; i++)
W[i] = R1(W[i-2]) + W[i-7] + R0(W[i-15]) + W[i-16];
a = s->h[0];
b = s->h[1];
c = s->h[2];
d = s->h[3];
e = s->h[4];
f = s->h[5];
g = s->h[6];
h = s->h[7];
for (i = 0; i < 64; i++) {
t1 = h + S1(e) + Ch(e, f, g) + K[i] + W[i];
t2 = S0(a) + Maj(a, b, c);
h = g;
g = f;
f = e;
e = d + t1;
d = c;
c = b;
b = a;
a = t1 + t2;
}
s->h[0] += a;
s->h[1] += b;
s->h[2] += c;
s->h[3] += d;
s->h[4] += e;
s->h[5] += f;
s->h[6] += g;
s->h[7] += h;
}
static void pad(struct sha256 *s)
{
unsigned r = s->len % 64;
s->buf[r++] = 0x80;
if (r > 56) {
memset(s->buf + r, 0, 64 - r);
r = 0;
processblock(s, s->buf);
}
memset(s->buf + r, 0, 56 - r);
s->len *= 8;
s->buf[56] = s->len >> 56;
s->buf[57] = s->len >> 48;
s->buf[58] = s->len >> 40;
s->buf[59] = s->len >> 32;
s->buf[60] = s->len >> 24;
s->buf[61] = s->len >> 16;
s->buf[62] = s->len >> 8;
s->buf[63] = s->len;
processblock(s, s->buf);
}
static void sha256_init(struct sha256 *s)
{
s->len = 0;
s->h[0] = 0x6a09e667;
s->h[1] = 0xbb67ae85;
s->h[2] = 0x3c6ef372;
s->h[3] = 0xa54ff53a;
s->h[4] = 0x510e527f;
s->h[5] = 0x9b05688c;
s->h[6] = 0x1f83d9ab;
s->h[7] = 0x5be0cd19;
}
static void sha256_sum(struct sha256 *s, uint8_t *md)
{
int i;
pad(s);
for (i = 0; i < 8; i++) {
md[4*i] = s->h[i] >> 24;
md[4*i+1] = s->h[i] >> 16;
md[4*i+2] = s->h[i] >> 8;
md[4*i+3] = s->h[i];
}
}
static void sha256_update(struct sha256 *s, const void *m, unsigned long len)
{
const uint8_t *p = m;
unsigned r = s->len % 64;
s->len += len;
if (r) {
if (len < 64 - r) {
memcpy(s->buf + r, p, len);
return;
}
memcpy(s->buf + r, p, 64 - r);
len -= 64 - r;
p += 64 - r;
processblock(s, s->buf);
}
for (; len >= 64; len -= 64, p += 64)
processblock(s, p);
memcpy(s->buf, p, len);
}
/* ------------------------------------------------------------------------- */
/***************** Globals ******************/
int dflag, xflag, wflag, fflag, log_fd, level;
/********************************************/
static const char
open_comment[] = "--[====================================================================[\n",
close_comment[] = "--]====================================================================]\n";
#define log_guard(str) if ((log_fd > 0) && (log_fd < 3)) dprintf(log_fd, str)
static void
msg(const char *name, const char *error)
{
log_guard(open_comment);
dprintf(2, "%s : %s\n", name, error);
log_guard(close_comment);
}
static void
pperror(const char *s)
{
msg(s, strerror(errno));
}
static const char redo_suffix[] = ".do";
static const char trickpoint[] = ".do.";
static const char redo_prefix[] = ".do..";
static const char lock_prefix[] = ".do...do..";
static const char target_prefix[] = ".do...do...do..";
static const char dirup[] = "../";
#define TRACK_DELIMITER ':'
static char *
track(const char *target, int track_op)
{
static char *track_buf = 0; /* this buffer will hold initial REDO_TRACK
stored once during the very first envocation
followed by target cwd and target basename
varying for consequent envocations */
static size_t track_buf_size = 0; /* the whole track_buf size, sufficient for
holding initial REDO_TRACK and current target
full path */
size_t target_len, track_engaged, target_wd_offset;
char *target_wd, *ptr;
if (track_buf_size == 0) { /* the very first invocation */
track_buf_size = PATH_MAX;
if (target) /* suppose getenv("REDO_TRACK") */
track_buf_size += strlen(target);
track_buf = malloc(track_buf_size);
if (!track_buf) {
perror("malloc");
exit (-1);
}
*track_buf = 0;
if (target)
strcpy(track_buf, target);
track_op = 0; /* enough for the first time */
}
if (!track_op)
return track_buf;
if (!target) { /* strip last path */
ptr = strrchr(track_buf, TRACK_DELIMITER);
if (ptr)
*ptr = 0;
return ptr;
}
/* store cwd in the track_buf */
target_wd_offset = strlen(track_buf) + 1;
track_engaged = target_wd_offset + strlen(target) + sizeof lock_prefix + 2;
while (1) {
if (track_buf_size > track_engaged) {
target_wd = getcwd(track_buf + target_wd_offset, track_buf_size - track_engaged);
if (target_wd) /* getcwd successful */
break;
} else
errno = ERANGE;
if (errno == ERANGE) { /* track_buf_size is not sufficient */
track_buf_size += PATH_MAX;
track_buf = realloc(track_buf, track_buf_size);
if (!track_buf) {
pperror("realloc");
return 0;
}
} else {
pperror ("getcwd");
return 0;
}
}
ptr = strchr(target_wd, '\0'); /* construct target full path */
*ptr++ = '/';
strcpy(ptr, target);
*--target_wd = TRACK_DELIMITER; /* join target full path with the track_buf */
/* searching for target full path inside track_buf */
ptr = track_buf;
target_len = strlen(target_wd);
do {
ptr = strstr(ptr, target_wd);
if (ptr == target_wd)
return target_wd + 1;
ptr += target_len;
} while (*ptr != TRACK_DELIMITER);
return 0;
}
static char *
base_name(char *name, int uprel)
{
char *ptr = strchr(name, '\0');
do {
while ((ptr != name) && (*--ptr != '/'));
} while (uprel--);
if (*ptr == '/')
ptr++;
return ptr;
}
static int
setenvfd(const char *name, int i)
{
char buf[16];
snprintf(buf, sizeof buf, "%d", i);
return setenv(name, buf, 1);
}
#define HASH_LEN 32
#define HEXHASH_LEN (2 * HASH_LEN)
#define HEXDATE_LEN 16
#define HEXHASH_SIZE (HEXHASH_LEN + 1)
#define HEXDATE_SIZE (HEXDATE_LEN + 1)
#define DATE_OFFSET (HEXHASH_SIZE)
#define NAME_OFFSET (DATE_OFFSET + HEXDATE_SIZE)
#define RECORD_SIZE (NAME_OFFSET + PATH_MAX + 1)
static char record_buf[RECORD_SIZE];
#define hexhash (record_buf)
#define hexdate (record_buf + DATE_OFFSET)
#define namebuf (record_buf + NAME_OFFSET)
static char *
hashfile(int fd)
{
static char hex[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
struct sha256 ctx;
char buf[4096];
char *a;
unsigned char hash[HASH_LEN];
int i;
ssize_t r;
sha256_init(&ctx);
while ((r = read(fd, buf, sizeof buf)) > 0) {
sha256_update(&ctx, buf, r);
}
sha256_sum(&ctx, hash);
for (i = 0, a = hexhash; i < HASH_LEN; i++) {
*a++ = hex[hash[i] / sizeof hex];
*a++ = hex[hash[i] % sizeof hex];
}
return hexhash;
}
#define stringize(s) stringyze(s)
#define stringyze(s) #s
static const char *
datestat(struct stat *st)
{
snprintf(hexdate, HEXDATE_LEN + 1, "%0" stringize(HEXDATE_LEN) PRIx64, (uint64_t)st->st_ctime);
return hexdate;
}
static const char *
datefile(int fd)
{
struct stat st = {0};
fstat(fd, &st);
return datestat(&st);
}
static const char *
datefilename(const char *name)
{
struct stat st = {0};
stat(name, &st);
return datestat(&st);
}
static const char *
datebuild()
{
static char build_date[HEXDATE_LEN + 1] = {'\0'};
const char *dateptr;
FILE *f;
if (build_date[0])
return build_date;
build_date[HEXDATE_LEN] = '\0';
dateptr = getenv("REDO_BUILD_DATE");
if (dateptr)
return memcpy(build_date, dateptr, HEXDATE_LEN);
f = tmpfile();
memcpy(build_date, datefile(fileno(f)), HEXDATE_LEN);
fclose(f);
setenv("REDO_BUILD_DATE", build_date, 1);
return build_date;
}
static char *
file_chdir(int *fd, char *name)
{
int fd_new;
char *slash = strrchr(name, '/');
if (!slash)
return name;
*slash = 0;
fd_new = openat(*fd, name, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
*slash = '/';
if (fd_new < 0) {
pperror("openat dir");
return 0;
}
if (fchdir(fd_new) < 0) {
pperror("chdir");
return 0;
}
*fd = fd_new;
return slash + 1;
}
#define SUFFIX_LEN (sizeof redo_suffix - 1)
#define reserve(space) if (dofile_free < (space)) return -1; dofile_free -= (space)
static int
find_dofile(char *dep, char *dofile_rel, size_t dofile_free, const char *slash)
{
char *dofile = dofile_rel;
char *end = strchr(dep, '\0');
char *tail = end;
char *ext, *dep_trickpoint;
size_t len = (end - dep) + SUFFIX_LEN + 1; /* dofile name size */
int uprel;
/* rewind .do tail inside dependency name */
while (1) {
ext = tail - SUFFIX_LEN;
if ((ext < dep) || strncmp(ext, redo_suffix, SUFFIX_LEN))
break;
if (!dflag)
return -1; /* skip dofile */
tail = ext;
}
reserve(len);
dep_trickpoint = strstr(dep, trickpoint);
if (dep_trickpoint == tail)
dep_trickpoint = 0;
strcpy(end, redo_suffix);
ext = strchr(dep, '.');
dofile_free += ext - dep; /* dependency first name length */
for (uprel = 0 ; slash ; uprel++, slash = strchr(slash + 1, '/')) {
while (dep != dep_trickpoint) {
strcpy(dofile, dep);
if (fflag)
dprintf(1, "%s\n", dofile_rel);
if (access(dofile_rel, F_OK) == 0) {
*dep = '\0';
return uprel;
}
if (dep == tail)
break;
while (*++dep != '.');
}
dep = ext;
reserve(sizeof dirup - 1);
dofile = stpcpy(dofile, dirup);
}
return -1;
}
enum errors {
OK = 0,
ERROR = 1,
BUSY = 2
};
#define ERRORS 0xff
enum hints {
BAD_NAME = 0x100,
IS_SOURCE = 0x200,
UPDATED_RECENTLY = 0x400,
IMMEDIATE_DEPENDENCY = 0x800
};
#define HINTS (~ERRORS)
static int
choose(const char *old, const char *new, int err, void (*perror_f)(const char *))
{
if (err) {
if ((access(new, F_OK) == 0) && (remove(new) != 0)) {
(*perror_f)("remove new");
err |= ERROR;
}
} else {
if ((access(old, F_OK) == 0) && (remove(old) != 0)) {
(*perror_f)("remove old");
err |= ERROR;
}
if ((access(new, F_OK) == 0) && (rename(new, old) != 0)) {
(*perror_f)("rename");
err |= ERROR;
}
}
return err;
}
static int
run_script(int dir_fd, int lock_fd, char *dofile_rel, const char *target,
const char *target_base, const char *target_rel)
{
int err = ERROR;
pid_t pid;
char *target_new;
char target_base_rel[PATH_MAX];
char target_new_rel[PATH_MAX + sizeof target_prefix];
if (strlen(target_rel) >= sizeof target_base_rel) {
dprintf(2, "Target relative name too long -- %s\n", target_rel);
return ERROR;
}
strcpy(target_base_rel, target_rel);
strcpy(base_name(target_base_rel, 0), target_base);
strcpy(target_new_rel, target_rel);
target_new = base_name(target_new_rel, 0);
strcpy(stpcpy(target_new, target_prefix), target);
pid = fork();
if (pid < 0) {
perror("fork");
} else if (pid == 0) {
const char *dofile = file_chdir(&dir_fd, dofile_rel);
char dirprefix[PATH_MAX];
size_t dirprefix_len = target_new - target_new_rel;
if (!dofile) {
dprintf(2, "Damn! Someone have stolen my favorite dofile %s ...\n", dofile_rel);
exit(ERROR);
}
memcpy(dirprefix, target_new_rel, dirprefix_len);
dirprefix[dirprefix_len] = '\0';
if ((setenvfd("REDO_LOCK_FD", lock_fd) != 0) ||
(setenv("REDO_DIRPREFIX", dirprefix, 1) != 0) ||
(setenv("REDO_TRACK", track(0, 0), 1) != 0)) {
perror("setenv");
exit(ERROR);
}
if (access(dofile, X_OK) != 0) /* run -x files with /bin/sh */
execl("/bin/sh", "/bin/sh", xflag ? "-ex" : "-e", dofile,
target_rel, target_base_rel, target_new_rel, (char *)0);
else
execl(dofile, dofile,
target_rel, target_base_rel, target_new_rel, (char *)0);
perror("execl");
exit(ERROR);
} else {
if (wait(&err) < 0) {
perror("wait");
} else {
if (WCOREDUMP(err)) {
dprintf(2, "Core dumped.\n");
}
if (WIFEXITED(err)) {
err = WEXITSTATUS(err);
} else if (WIFSIGNALED(err)) {
dprintf(2, "Terminated with %d signal.\n", WTERMSIG(err));
} else if (WIFSTOPPED(err)) {
dprintf(2, "Stopped with %d signal.\n", WSTOPSIG(err));
}
}
}
return choose(target, target_new, err, perror);
}
static int
check(char *record)
{
char *w, *last = strchr(record, '\0') - 1;
if ((last - record) < NAME_OFFSET) {
w = "Warning - dependency record too short. Target will be rebuilt";
} else if (*last != '\n') {
w = "Warning - dependency record truncated. Target will be rebuilt";
} else {
*last = '\0';
return 1;
}
msg(record, w);
return 0;
}
static int
find_record(char *filename)
{
char redofile[PATH_MAX + sizeof redo_prefix];
char *target = base_name(filename, 0);
int err = ERROR;
strcpy(redofile, filename);
strcpy(base_name(redofile, 0), redo_prefix);
strcat(redofile, target);
FILE *f = fopen(redofile, "r");
if (f) {
while (fgets(record_buf, RECORD_SIZE, f) && check(record_buf)) {
if (strcmp(target, namebuf) == 0) {
err = OK;
break;
}
}
fclose(f);
}
return err;
}
#define may_need_rehash(f,h) ((h & IS_SOURCE) || ((!(h & UPDATED_RECENTLY)) && find_record(f)))
static int
dep_changed(char *record, int hint)
{
char *filename = record + NAME_OFFSET;
char *filedate = record + DATE_OFFSET;
int fd;
if (may_need_rehash(filename, hint)) {
if (strncmp(filedate, datefilename(filename), HEXDATE_LEN) == 0)
return 0;
fd = open(filename, O_RDONLY);
hashfile(fd);
close(fd);
} else {
if (strncmp(filedate, hexdate, HEXDATE_LEN) == 0)
return 0;
}
return strncmp(record, hexhash, HEXHASH_LEN);
}
static int
write_dep(int lock_fd, char *file, const char *dp, const char *updir, int hint)
{
int fd;
const char *prefix = "";
if (may_need_rehash(file, hint)) {
fd = open(file, O_RDONLY);
hashfile(fd);
datefile(fd);
if (fd > 0)
close(fd);
}
if (dp && *file != '/') {
size_t dp_len = strlen(dp);
if (strncmp(file, dp, dp_len) == 0)
file += dp_len;
else
prefix = updir;
}
*(hexhash + HEXHASH_LEN) = '\0';
*(hexdate + HEXDATE_LEN) = '\0';
if (dprintf(lock_fd, "%s %s %s%s\n", hexhash, hexdate, prefix, file) < 0) {
pperror("dprintf");
return ERROR;
}
return OK;
}
#define INDENT 2
static int update_dep(int *dir_fd, char *dep_path);
static int
do_update_dep(int dir_fd, char *dep_path, int *hint)
{
int dep_dir_fd = dir_fd, err;
level += INDENT;
err = update_dep(&dep_dir_fd, dep_path);
if ((err & BAD_NAME) == 0)
track(0, 1); /* strip the last record */
if (dir_fd != dep_dir_fd) {
if (fchdir(dir_fd) < 0) {
pperror("chdir back");
err |= ERROR;
}
close(dep_dir_fd);
}
*hint = err & HINTS;
level -= INDENT;
return err & ERRORS;
}
#define USEC_PER_SEC 1000000
#define NSEC_PER_USEC 1000
static int64_t
timestamp(void)
{
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return (int64_t)ts.tv_sec * USEC_PER_SEC + ts.tv_nsec / NSEC_PER_USEC;
}
#define log_name(name) if (log_fd > 0)\
dprintf(log_fd, "%*s\"%s\",\n", level, "", name)
#define log_level() if (log_fd > 0)\
dprintf(log_fd, "%*s{ err = %d },\n", level, "", err)
#define open_level() if (log_fd > 0)\
dprintf(log_fd, "%*s{\n%*st0 = %" PRId64 ",\n",\
level, "", level + 8, "", timestamp())
#define close_level() if (log_fd > 0)\
dprintf(log_fd, "%*st1 = %" PRId64 ",\n%*serr = %d,\n%*s},\n",\
level + 8, "", timestamp(), level, "", err, level, "")
#define NAME_MAX 255
static int
update_dep(int *dir_fd, char *dep_path)
{
char *dep, *target_full;
char target_base[NAME_MAX + 1];
char dofile_rel[PATH_MAX];
char redofile[NAME_MAX + 1];
char lockfile[NAME_MAX + 1];
int uprel, lock_fd, err = 0, wanted = 1, hint, is_dofile = 1;
struct stat redo_st = {0};
FILE *fredo;
if (strchr(dep_path, TRACK_DELIMITER)) {
msg(dep_path, "Illegal symbol " stringize(TRACK_DELIMITER));
return ERROR | BAD_NAME;
}
dep = file_chdir(dir_fd, dep_path);
if (dep == 0) {
msg(dep_path, "Missing dependency directory");
return ERROR | BAD_NAME;
}
if (strlen(dep) > (sizeof target_base - sizeof target_prefix)) {
msg(dep, "Dependency name too long");
return ERROR | BAD_NAME;
}
target_full = track(dep, 1);
if (target_full == 0) {
msg(track(0, 0), "Dependency loop attempt");
return wflag ? IS_SOURCE : ERROR;
}
strcpy(target_base, dep);
strcpy(stpcpy(redofile, redo_prefix), dep);
strcpy(stpcpy(lockfile, lock_prefix), dep);
log_name(target_full);
if (fflag)
dprintf(1, "--[[\n");
uprel = find_dofile(target_base, dofile_rel, sizeof dofile_rel, target_full);
if (fflag)
dprintf(1, "--]]\n");
if (uprel < 0)
return IS_SOURCE;
stat(redofile, &redo_st);
if (strcmp(datestat(&redo_st), datebuild()) >= 0) {
err = (redo_st.st_mode & S_IRUSR) ? OK : ERROR;
log_level();
return err;
}
lock_fd = open(lockfile, O_CREAT | O_WRONLY | O_EXCL, 0666);
if (lock_fd < 0) {
if (errno == EEXIST) {
err = BUSY | IMMEDIATE_DEPENDENCY;
} else {
pperror("open exclusive");
err = ERROR;
}
log_level();
return err;
}
open_level();
fredo = fopen(redofile, "r");
if (fredo) {
char record[RECORD_SIZE];
char *filename = record + NAME_OFFSET;
while (fgets(record, RECORD_SIZE, fredo) && check(record)) {
int self = !strcmp(filename, dep);
if (is_dofile) {
if (strcmp(filename, dofile_rel))
break;
is_dofile = 0;
}
if (self)
hint = IS_SOURCE;
else
err = do_update_dep(*dir_fd, filename, &hint);
if (err || dep_changed(record, hint))
break;
memcpy(hexhash, record, HEXHASH_LEN);
err = write_dep(lock_fd, filename, 0, 0, UPDATED_RECENTLY);
if (err)
break;
if (self) {
wanted = 0;
break;
}
}
fclose(fredo);
hint = 0;
}
if (!fredo || is_dofile)
err = do_update_dep(*dir_fd, dofile_rel, &hint);
target_full = strrchr(track(0, 0), TRACK_DELIMITER) + 1;
if (!err && wanted) {
lseek(lock_fd, 0, SEEK_SET);
err = write_dep(lock_fd, dofile_rel, 0, 0, hint);
if (!err) {