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/***
SPDX-License-Identifier: LGPL-2.1+
***/
#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 "main-func.h"
#include "process-util.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("(mkfs)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_RLIMIT_NOFILE_SAFE|FORK_LOG, &pid);
if (r < 0)
return r;
if (r == 0) {
const char *cmdline[3] = { mkfs, device, NULL };
/* Child */
execv(cmdline[0], (char**) cmdline);
_exit(EXIT_FAILURE);
}
return wait_for_terminate_and_check(mkfs, pid, WAIT_LOG);
}
static int run(int argc, char *argv[]) {
const char *device, *type;
_cleanup_free_ char *detected = NULL;
struct stat st;
int r;
log_setup_service();
if (argc != 3)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"This program expects two arguments.");
type = argv[1];
device = argv[2];
if (stat(device, &st) < 0)
return log_error_errno(errno, "Failed to stat \"%s\": %m", device);
if (!S_ISBLK(st.st_mode))
log_info("%s is not a block device.", device);
r = probe_filesystem(device, &detected);
if (r < 0)
return log_warning_errno(r,
r == -EUCLEAN ?
"Cannot reliably determine probe \"%s\", refusing to proceed." :
"Failed to probe \"%s\": %m",
device);
if (detected) {
log_info("%s is not empty (type %s), exiting", device, detected);
return 0;
}
return makefs(type, device);
}
DEFINE_MAIN_FUNCTION(run);
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