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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 "dirent-util.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;
const char *e;
bool lenient = false;
if (saved_in_initrd >= 0)
return saved_in_initrd;
/* We have two checks here:
*
* 1. the flag file /etc/initrd-release must exist
* 2. the root file system must be a memory file system
*
* The second check is extra paranoia, since misdetecting an
* initrd can have bad consequences due the initrd
* emptying when transititioning to the main systemd.
*
* If env var $SYSTEMD_IN_INITRD is not set or set to "auto",
* both checks are used. If it's set to "lenient", only check
* 1 is used. If set to a boolean value, then the boolean
* value is returned.
*/
e = secure_getenv("SYSTEMD_IN_INITRD");
if (e) {
if (streq(e, "lenient"))
lenient = true;
else if (!streq(e, "auto")) {
r = parse_boolean(e);
if (r >= 0) {
saved_in_initrd = r > 0;
return saved_in_initrd;
}
log_debug_errno(r, "Failed to parse $SYSTEMD_IN_INITRD, ignoring: %m");
}
}
if (!lenient) {
r = path_is_temporary_fs("/");
if (r < 0)
log_debug_errno(r, "Couldn't determine if / is a temporary file system: %m");
saved_in_initrd = r > 0;
}
r = access("/etc/initrd-release", F_OK);
if (r >= 0) {
if (saved_in_initrd == 0)
log_debug("/etc/initrd-release exists, but it's not an initrd.");
else
saved_in_initrd = 1;
} else {
if (errno != ENOENT)
log_debug_errno(errno, "Failed to test if /etc/initrd-release exists: %m");
saved_in_initrd = 0;
}
return saved_in_initrd;
}
void in_initrd_force(bool value) {
saved_in_initrd = value;
}
int on_ac_power(void) {
bool found_offline = false, found_online = false;
_cleanup_closedir_ DIR *d = NULL;
int r;
d = opendir("/sys/class/power_supply");
if (!d)
return errno == ENOENT ? true : -errno;
FOREACH_DIRENT(de, d, return -errno) {
_cleanup_close_ int device_fd = -1;
_cleanup_free_ char *contents = NULL;
unsigned v;
device_fd = openat(dirfd(d), de->d_name, O_DIRECTORY|O_RDONLY|O_CLOEXEC);
if (device_fd < 0) {
if (IN_SET(errno, ENOENT, ENOTDIR))
continue;
return -errno;
}
r = read_virtual_file_at(device_fd, "type", SIZE_MAX, &contents, NULL);
if (r == -ENOENT)
continue;
if (r < 0)
return r;
delete_trailing_chars(contents, NEWLINE);
/* We assume every power source is AC, except for batteries. See
* https://github.com/torvalds/linux/blob/4eef766b7d4d88f0b984781bc1bcb574a6eafdc7/include/linux/power_supply.h#L176
* for defined power source types. Also see:
* https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-class-power */
if (streq(contents, "Battery"))
continue;
contents = mfree(contents);
r = read_virtual_file_at(device_fd, "online", SIZE_MAX, &contents, NULL);
if (r == -ENOENT)
continue;
if (r < 0)
return r;
delete_trailing_chars(contents, NEWLINE);
r = safe_atou(contents, &v);
if (r < 0)
return r;
if (v > 0) /* At least 1 and 2 are defined as different types of 'online' */
found_online = true;
else
found_offline = true;
}
return found_online || !found_offline;
}
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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