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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <fcntl.h>
#include <sys/mman.h>
#include "alloc-util.h"
#include "build.h"
#include "env-file.h"
#include "env-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "hostname-util.h"
#include "log.h"
#include "macro.h"
#include "parse-util.h"
#include "stat-util.h"
#include "string-util.h"
#include "util.h"
#include "virt.h"
int saved_argc = 0;
char **saved_argv = NULL;
static int saved_in_initrd = -1;
bool kexec_loaded(void) {
_cleanup_free_ char *s = NULL;
if (read_one_line_file("/sys/kernel/kexec_loaded", &s) < 0)
return false;
return s[0] == '1';
}
int prot_from_flags(int flags) {
switch (flags & O_ACCMODE) {
case O_RDONLY:
return PROT_READ;
case O_WRONLY:
return PROT_WRITE;
case O_RDWR:
return PROT_READ|PROT_WRITE;
default:
return -EINVAL;
}
}
bool in_initrd(void) {
int r;
if (saved_in_initrd >= 0)
return saved_in_initrd;
/* If /etc/initrd-release exists, we're in an initrd.
* This can be overridden by setting SYSTEMD_IN_INITRD=0|1.
*/
r = getenv_bool_secure("SYSTEMD_IN_INITRD");
if (r < 0 && r != -ENXIO)
log_debug_errno(r, "Failed to parse $SYSTEMD_IN_INITRD, ignoring: %m");
if (r >= 0)
saved_in_initrd = r > 0;
else {
r = access("/etc/initrd-release", F_OK);
if (r < 0 && errno != ENOENT)
log_debug_errno(r, "Failed to check if /etc/initrd-release exists, assuming it does not: %m");
saved_in_initrd = r >= 0;
}
return saved_in_initrd;
}
void in_initrd_force(bool value) {
saved_in_initrd = value;
}
int container_get_leader(const char *machine, pid_t *pid) {
_cleanup_free_ char *s = NULL, *class = NULL;
const char *p;
pid_t leader;
int r;
assert(machine);
assert(pid);
if (streq(machine, ".host")) {
*pid = 1;
return 0;
}
if (!hostname_is_valid(machine, 0))
return -EINVAL;
p = strjoina("/run/systemd/machines/", machine);
r = parse_env_file(NULL, p,
"LEADER", &s,
"CLASS", &class);
if (r == -ENOENT)
return -EHOSTDOWN;
if (r < 0)
return r;
if (!s)
return -EIO;
if (!streq_ptr(class, "container"))
return -EIO;
r = parse_pid(s, &leader);
if (r < 0)
return r;
if (leader <= 1)
return -EIO;
*pid = leader;
return 0;
}
int version(void) {
printf("systemd " STRINGIFY(PROJECT_VERSION) " (" GIT_VERSION ")\n%s\n",
systemd_features);
return 0;
}
/* Turn off core dumps but only if we're running outside of a container. */
void disable_coredumps(void) {
int r;
if (detect_container() > 0)
return;
r = write_string_file("/proc/sys/kernel/core_pattern", "|/bin/false", WRITE_STRING_FILE_DISABLE_BUFFER);
if (r < 0)
log_debug_errno(r, "Failed to turn off coredumps, ignoring: %m");
}
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