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/***
SPDX-License-Identifier: LGPL-2.1+
This file is part of systemd.
Copyright 2017 Zbigniew Jędrzejewski-Szmek
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <fcntl.h>
#include <signal.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "alloc-util.h"
#include "dissect-image.h"
#include "signal-util.h"
#include "string-util.h"
static int makefs(const char *type, const char *device) {
const char *mkfs;
pid_t pid;
int r;
if (streq(type, "swap"))
mkfs = "/sbin/mkswap";
else
mkfs = strjoina("/sbin/mkfs.", type);
if (access(mkfs, X_OK) != 0)
return log_error_errno(errno, "%s is not executable: %m", mkfs);
r = safe_fork("(fsck)", FORK_RESET_SIGNALS|FORK_DEATHSIG, &pid);
if (r < 0)
return log_error_errno(r, "fork(): %m");
if (r == 0) {
const char *cmdline[3] = { mkfs, device, NULL };
/* Child */
execv(cmdline[0], (char**) cmdline);
_exit(EXIT_FAILURE);
}
return wait_for_terminate_and_warn(mkfs, pid, true);
}
int main(int argc, char *argv[]) {
const char *device, *type;
_cleanup_free_ char *detected = NULL;
struct stat st;
int r;
log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
log_open();
if (argc != 3) {
log_error("This program expects two arguments.");
return EXIT_FAILURE;
}
type = argv[1];
device = argv[2];
if (stat(device, &st) < 0) {
r = log_error_errno(errno, "Failed to stat \"%s\": %m", device);
goto finish;
}
if (!S_ISBLK(st.st_mode))
log_info("%s is not a block device.", device);
r = probe_filesystem(device, &detected);
if (r < 0) {
log_warning_errno(r,
r == -EUCLEAN ?
"Cannot reliably determine probe \"%s\", refusing to proceed." :
"Failed to probe \"%s\": %m",
device);
goto finish;
}
if (detected) {
log_info("%s is not empty (type %s), exiting", device, detected);
goto finish;
}
r = makefs(type, device);
finish:
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
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