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// Copyright © Tavian Barnes <tavianator@tavianator.com>
// SPDX-License-Identifier: 0BSD
#include "../src/bfstd.h"
#include "../src/config.h"
#include "../src/sanity.h"
#include "../src/xtime.h"
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <time.h>
#include <unistd.h>
/** Parsed xtouch arguments. */
struct args {
/** Simple flags. */
enum {
/** Don't create nonexistent files (-c). */
NO_CREATE = 1 << 0,
/** Don't follow symlinks (-h). */
NO_FOLLOW = 1 << 1,
/** Create any missing parent directories (-p). */
CREATE_PARENTS = 1 << 2,
} flags;
/** Timestamps (-r|-t|-d). */
struct timespec times[2];
/** File creation mode (-M; default 0666 & ~umask). */
mode_t fmode;
/** Directory creation mode (-M; default 0777 & ~umask). */
mode_t dmode;
/** Parent directory creation mode (0777 & ~umask). */
mode_t pmode;
};
/** Compute flags for fstatat()/utimensat(). */
static int at_flags(const struct args *args) {
if (args->flags & NO_FOLLOW) {
return AT_SYMLINK_NOFOLLOW;
} else {
return 0;
}
}
/** Create any parent directories of the given path. */
static int mkdirs(const char *path, mode_t mode) {
char *copy = strdup(path);
if (!copy) {
return -1;
}
int ret = -1;
char *cur = copy + strspn(copy, "/");
while (true) {
cur += strcspn(cur, "/");
char *next = cur + strspn(cur, "/");
if (!*next) {
ret = 0;
break;
}
*cur = '\0';
if (mkdir(copy, mode) != 0 && errno != EEXIST) {
break;
}
*cur = '/';
cur = next;
}
free(copy);
return ret;
}
/** Touch one path. */
static int xtouch(const struct args *args, const char *path) {
int ret = utimensat(AT_FDCWD, path, args->times, at_flags(args));
if (ret == 0 || errno != ENOENT) {
return ret;
}
if (args->flags & NO_CREATE) {
return 0;
} else if (args->flags & CREATE_PARENTS) {
if (mkdirs(path, args->pmode) != 0) {
return -1;
}
}
size_t len = strlen(path);
if (len > 0 && path[len - 1] == '/') {
if (mkdir(path, args->dmode) != 0) {
return -1;
}
return utimensat(AT_FDCWD, path, args->times, at_flags(args));
} else {
int fd = open(path, O_WRONLY | O_CREAT, args->fmode);
if (fd < 0) {
return -1;
}
if (futimens(fd, args->times) != 0) {
close_quietly(fd);
return -1;
}
return xclose(fd);
}
}
int main(int argc, char *argv[]) {
mode_t mask = umask(0);
struct args args = {
.flags = 0,
.times = {
{ .tv_nsec = UTIME_OMIT },
{ .tv_nsec = UTIME_OMIT },
},
.fmode = 0666 & ~mask,
.dmode = 0777 & ~mask,
.pmode = 0777 & ~mask,
};
bool atime = false, mtime = false;
const char *darg = NULL;
const char *marg = NULL;
const char *rarg = NULL;
const char *cmd = argc > 0 ? argv[0] : "xtouch";
int c;
while (c = getopt(argc, argv, ":M:acd:hmpr:t:"), c != -1) {
switch (c) {
case 'M':
marg = optarg;
break;
case 'a':
atime = true;
break;
case 'c':
args.flags |= NO_CREATE;
break;
case 'd':
case 't':
darg = optarg;
break;
case 'h':
args.flags |= NO_FOLLOW;
break;
case 'm':
mtime = true;
break;
case 'p':
args.flags |= CREATE_PARENTS;
break;
case 'r':
rarg = optarg;
break;
case ':':
fprintf(stderr, "%s: Missing argument to -%c\n", cmd, optopt);
return EXIT_FAILURE;
case '?':
fprintf(stderr, "%s: Unrecognized option -%c\n", cmd, optopt);
return EXIT_FAILURE;
}
}
if (marg) {
char *end;
long mode = strtol(marg, &end, 8);
// https://github.com/llvm/llvm-project/issues/64946
sanitize_init(&end);
if (*marg && !*end && mode >= 0 && mode < 01000) {
args.fmode = args.dmode = mode;
} else {
fprintf(stderr, "%s: Invalid mode '%s'\n", cmd, marg);
return EXIT_FAILURE;
}
}
struct timespec times[2];
if (rarg) {
struct stat buf;
if (fstatat(AT_FDCWD, rarg, &buf, at_flags(&args)) != 0) {
fprintf(stderr, "%s: '%s': %s\n", cmd, rarg, strerror(errno));
return EXIT_FAILURE;
}
times[0] = buf.st_atim;
times[1] = buf.st_mtim;
} else if (darg) {
if (xgetdate(darg, ×[0]) != 0) {
fprintf(stderr, "%s: Parsing time '%s' failed: %s\n", cmd, darg, strerror(errno));
return EXIT_FAILURE;
}
times[1] = times[0];
} else {
// Don't use UTIME_NOW, so that multiple paths all get the same timestamp
if (xgettime(×[0]) != 0) {
perror("xgettime()");
return EXIT_FAILURE;
}
times[1] = times[0];
}
if (!atime && !mtime) {
atime = true;
mtime = true;
}
if (atime) {
args.times[0] = times[0];
}
if (mtime) {
args.times[1] = times[1];
}
if (optind >= argc) {
fprintf(stderr, "%s: No files to touch\n", cmd);
return EXIT_FAILURE;
}
int ret = EXIT_SUCCESS;
for (; optind < argc; ++optind) {
const char *path = argv[optind];
if (xtouch(&args, path) != 0) {
fprintf(stderr, "%s: '%s': %s\n", cmd, path, strerror(errno));
ret = EXIT_FAILURE;
}
}
return ret;
}
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