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Differential D37753 Diff 116063 tests/sys/fs/tarfs/mktar.c

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tests/sys/fs/tarfs/mktar.c

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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2023 Klara, Inc.
*
* 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 AUTHOR 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 AUTHOR 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.
*/
#include <sys/stat.h>
#include <sys/wait.h>
#include <err.h>
#include <fcntl.h>
#include <paths.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#define PROGNAME "mktar"
#define SUBDIRNAME "directory"
#define SPARSEFILENAME "sparse_file"
#define HARDLINKNAME "hard_link"
#define SHORTLINKNAME "short_link"
#define LONGLINKNAME "long_link"
static bool opt_v;
static void verbose(const char *fmt, ...)
{
va_list ap;
if (!opt_v)
return;
fprintf(stderr, "%s: ", PROGNAME);
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, "\n");
}
static void
mksparsefile(const char *filename, mode_t mode)
{
char buf[511];
ssize_t res;
int fd;
if ((fd = open(filename, O_RDWR|O_CREAT|O_TRUNC, mode)) < 0)
err(1, "%s", filename);
for (unsigned int i = 33; i <= 126; i++) {
memset(buf, i, sizeof(buf));
if (lseek(fd, 1048576LU * (i - 32), SEEK_SET) < 0)
err(1, "%s", filename);
res = write(fd, buf, sizeof(buf));
if (res < 0)
err(1, "%s", filename);
if (res != sizeof(buf))
errx(1, "%s: short write", filename);
}
close(fd);
}
static char *
mklonglinktarget(const char *dirname, const char *filename)
{
char *piece, *target;
if (asprintf(&piece, "%1$s/../%1$s/../%1$s/../%1$s/../", dirname) < 0)
err(1, "asprintf()");
if (asprintf(&target, "%1$s%1$s%1$s%1$s%1$s%1$s%1$s%1$s%2$s", piece, filename) < 0)
err(1, "asprintf()");
free(piece);
return target;
}
static void
mktar(void)
{
char *linktarget;
/* create a subdirectory */
verbose("mkdir %s", SUBDIRNAME);
if (mkdir(SUBDIRNAME, 0755) != 0)
err(1, "%s", SUBDIRNAME);
/* create a sparse file */
verbose("creating %s", SPARSEFILENAME);
mksparsefile(SPARSEFILENAME, 0644);
chflags(SPARSEFILENAME, UF_NODUMP);
/* create a hard link */
verbose("link %s %s", SPARSEFILENAME, HARDLINKNAME);
if (link(SPARSEFILENAME, HARDLINKNAME) != 0)
err(1, "%s", HARDLINKNAME);
/* create a symbolic link with a short target */
verbose("symlink %s %s", SPARSEFILENAME, SHORTLINKNAME);
if (symlink(SPARSEFILENAME, SHORTLINKNAME) != 0)
err(1, "%s", SHORTLINKNAME);
/* create a symbolic link with a long target */
linktarget = mklonglinktarget(SUBDIRNAME, SPARSEFILENAME);
verbose("symlink %s %s", linktarget, LONGLINKNAME);
if (symlink(linktarget, LONGLINKNAME) != 0)
err(1, "%s", LONGLINKNAME);
free(linktarget);
}
static void
usage(void)
{
fprintf(stderr, "usage: %s [-v] tarfile\n", PROGNAME);
exit(EXIT_FAILURE);
}
int
main(int argc, char *argv[])
{
const char *tarfilename;
char *dirname;
int opt, wstatus;
pid_t pid;
while ((opt = getopt(argc, argv, "v")) != -1)
switch (opt) {
case 'v':
opt_v = true;
break;
default:
usage();
}
argc -= optind;
argv += optind;
if (argc != 1)
usage();
tarfilename = *argv;
if (asprintf(&dirname, "%s%s.XXXXXXXX", _PATH_TMP, PROGNAME) < 0)
err(1, "asprintf()");
if (mkdtemp(dirname) == NULL)
err(1, "%s", dirname);
verbose("mkdir %s", dirname);
/* fork a child to create the files */
if ((pid = fork()) < 0)
err(1, "fork()");
if (pid == 0) {
verbose("cd %s", dirname);
if (chdir(dirname) != 0)
err(1, "%s", dirname);
verbose("umask 022");
umask(022);
mktar();
verbose("cd -");
exit(0);
}
if (waitpid(pid, &wstatus, 0) < 0)
err(1, "waitpid()");
if (!WIFEXITED(wstatus) || WEXITSTATUS(wstatus) != 0)
errx(1, "child failed");
/* fork a child to create the tarball */
if ((pid = fork()) < 0)
err(1, "fork()");
if (pid == 0) {
verbose("creating tarball");
execlp("tar", "tar",
"-c",
"-f", tarfilename,
"-C", dirname,
"--zstd",
#if 0
"--options", "zstd:frame-per-file",
#endif
".",
NULL);
err(1, "execlp()");
}
if (waitpid(pid, &wstatus, 0) < 0)
err(1, "waitpid()");
if (!WIFEXITED(wstatus) || WEXITSTATUS(wstatus) != 0)
errx(1, "child failed");
/* fork a child to delete everything */
if ((pid = fork()) < 0)
err(1, "fork()");
if (pid == 0) {
verbose("cd %s", dirname);
if (chdir(dirname) != 0)
err(1, "%s", dirname);
verbose("rm %s", LONGLINKNAME);
(void)unlink(LONGLINKNAME);
verbose("rm %s", SHORTLINKNAME);
(void)unlink(SHORTLINKNAME);
verbose("rm %s", HARDLINKNAME);
(void)unlink(HARDLINKNAME);
verbose("rm %s", SPARSEFILENAME);
(void)unlink(SPARSEFILENAME);
verbose("rm %s", SUBDIRNAME);
(void)rmdir(SUBDIRNAME);
verbose("cd -");
exit(0);
}
if (waitpid(pid, &wstatus, 0) < 0)
err(1, "waitpid()");
if (!WIFEXITED(wstatus) || WEXITSTATUS(wstatus) != 0)
errx(1, "child failed");
verbose("rmdir %s", dirname);
(void)rmdir(dirname);
exit(0);
}