char *resolve_dev_console(char **active) {
char *tty;
/* Resolve where /dev/console is pointing to, if /sys is actually ours
* (i.e. not read-only-mounted which is a sign for container setups) */
if (path_is_read_only_fs("/sys") > 0)
return NULL;
if (read_one_line_file("/sys/class/tty/console/active", active) < 0)
return NULL;
/* If multiple log outputs are configured the last one is what
* /dev/console points to */
tty = strrchr(*active, ' ');
if (tty)
tty++;
else
tty = *active;
if (streq(tty, "tty0")) {
char *tmp;
/* Get the active VC (e.g. tty1) */
if (read_one_line_file("/sys/class/tty/tty0/active", &tmp) >= 0) {
free(*active);
tty = *active = tmp;
}
}
return tty;
}
static int condition_test_path_is_read_write(Condition *c) {
assert(c);
assert(c->parameter);
assert(c->type == CONDITION_PATH_IS_READ_WRITE);
return path_is_read_only_fs(c->parameter) <= 0;
}
static int condition_test_needs_update(Condition *c) {
const char *p;
struct stat usr, other;
assert(c);
assert(c->parameter);
assert(c->type == CONDITION_NEEDS_UPDATE);
/* If the file system is read-only we shouldn't suggest an update */
if (path_is_read_only_fs(c->parameter) > 0)
return false;
/* Any other failure means we should allow the condition to be true,
* so that we rather invoke too many update tools then too
* few. */
if (!path_is_absolute(c->parameter))
return true;
p = strjoina(c->parameter, "/.updated");
if (lstat(p, &other) < 0)
return true;
if (lstat("/usr/", &usr) < 0)
return true;
return usr.st_mtim.tv_sec > other.st_mtim.tv_sec ||
(usr.st_mtim.tv_sec == other.st_mtim.tv_sec && usr.st_mtim.tv_nsec > other.st_mtim.tv_nsec);
}
static int parse_fstab(bool initrd) {
_cleanup_endmntent_ FILE *f = NULL;
const char *fstab_path;
struct mntent *me;
int r = 0;
fstab_path = initrd ? "/sysroot/etc/fstab" : "/etc/fstab";
f = setmntent(fstab_path, "re");
if (!f) {
if (errno == ENOENT)
return 0;
log_error_errno(errno, "Failed to open %s: %m", fstab_path);
return -errno;
}
while ((me = getmntent(f))) {
_cleanup_free_ char *where = NULL, *what = NULL;
bool noauto, nofail;
int k;
if (initrd && !mount_in_initrd(me))
continue;
what = fstab_node_to_udev_node(me->mnt_fsname);
if (!what)
return log_oom();
if (is_device_path(what) && path_is_read_only_fs("sys") > 0) {
log_info("Running in a container, ignoring fstab device entry for %s.", what);
continue;
}
where = initrd ? strappend("/sysroot/", me->mnt_dir) : strdup(me->mnt_dir);
if (!where)
return log_oom();
if (is_path(where))
path_kill_slashes(where);
noauto = fstab_test_yes_no_option(me->mnt_opts, "noauto\0" "auto\0");
nofail = fstab_test_yes_no_option(me->mnt_opts, "nofail\0" "fail\0");
log_debug("Found entry what=%s where=%s type=%s nofail=%s noauto=%s",
what, where, me->mnt_type,
yes_no(noauto), yes_no(nofail));
if (streq(me->mnt_type, "swap"))
k = add_swap(what, me, noauto, nofail);
else {
bool automount;
const char *post;
automount = fstab_test_option(me->mnt_opts,
"comment=systemd.automount\0"
"x-systemd.automount\0");
if (initrd)
post = SPECIAL_INITRD_FS_TARGET;
else if (mount_in_initrd(me))
post = SPECIAL_INITRD_ROOT_FS_TARGET;
else if (mount_is_network(me))
post = SPECIAL_REMOTE_FS_TARGET;
else
post = SPECIAL_LOCAL_FS_TARGET;
k = add_mount(what,
where,
me->mnt_type,
me->mnt_opts,
me->mnt_passno,
noauto,
nofail,
automount,
post,
fstab_path);
}
if (k < 0)
r = k;
}
return r;
}
static int condition_test_needs_update(Condition *c) {
const char *p;
struct stat usr, other;
assert(c);
assert(c->parameter);
assert(c->type == CONDITION_NEEDS_UPDATE);
/* If the file system is read-only we shouldn't suggest an update */
if (path_is_read_only_fs(c->parameter) > 0)
return false;
/* Any other failure means we should allow the condition to be true,
* so that we rather invoke too many update tools than too
* few. */
if (!path_is_absolute(c->parameter))
return true;
p = strjoina(c->parameter, "/.updated");
if (lstat(p, &other) < 0)
return true;
if (lstat("/usr/", &usr) < 0)
return true;
/*
* First, compare seconds as they are always accurate...
*/
if (usr.st_mtim.tv_sec != other.st_mtim.tv_sec)
return usr.st_mtim.tv_sec > other.st_mtim.tv_sec;
/*
* ...then compare nanoseconds.
*
* A false positive is only possible when /usr's nanoseconds > 0
* (otherwise /usr cannot be strictly newer than the target file)
* AND the target file's nanoseconds == 0
* (otherwise the filesystem supports nsec timestamps, see stat(2)).
*/
if (usr.st_mtim.tv_nsec > 0 && other.st_mtim.tv_nsec == 0) {
_cleanup_free_ char *timestamp_str = NULL;
uint64_t timestamp;
int r;
r = parse_env_file(p, NULL, "TIMESTAMP_NSEC", ×tamp_str, NULL);
if (r < 0) {
log_error_errno(r, "Failed to parse timestamp file '%s', using mtime: %m", p);
return true;
} else if (r == 0) {
log_debug("No data in timestamp file '%s', using mtime", p);
return true;
}
r = safe_atou64(timestamp_str, ×tamp);
if (r < 0) {
log_error_errno(r, "Failed to parse timestamp value '%s' in file '%s', using mtime: %m", timestamp_str, p);
return true;
}
timespec_store(&other.st_mtim, timestamp);
}
return usr.st_mtim.tv_nsec > other.st_mtim.tv_nsec;
}
static bool condition_test(Condition *c) {
assert(c);
switch(c->type) {
case CONDITION_PATH_EXISTS:
return (access(c->parameter, F_OK) >= 0) == !c->negate;
case CONDITION_PATH_EXISTS_GLOB:
return (glob_exists(c->parameter) > 0) == !c->negate;
case CONDITION_PATH_IS_DIRECTORY: {
struct stat st;
if (stat(c->parameter, &st) < 0)
return c->negate;
return S_ISDIR(st.st_mode) == !c->negate;
}
case CONDITION_PATH_IS_SYMBOLIC_LINK: {
struct stat st;
if (lstat(c->parameter, &st) < 0)
return c->negate;
return S_ISLNK(st.st_mode) == !c->negate;
}
case CONDITION_PATH_IS_MOUNT_POINT:
return (path_is_mount_point(c->parameter, true) > 0) == !c->negate;
case CONDITION_PATH_IS_READ_WRITE:
return (path_is_read_only_fs(c->parameter) > 0) == c->negate;
case CONDITION_DIRECTORY_NOT_EMPTY: {
int k;
k = dir_is_empty(c->parameter);
return !(k == -ENOENT || k > 0) == !c->negate;
}
case CONDITION_FILE_NOT_EMPTY: {
struct stat st;
if (stat(c->parameter, &st) < 0)
return c->negate;
return (S_ISREG(st.st_mode) && st.st_size > 0) == !c->negate;
}
case CONDITION_FILE_IS_EXECUTABLE: {
struct stat st;
if (stat(c->parameter, &st) < 0)
return c->negate;
return (S_ISREG(st.st_mode) && (st.st_mode & 0111)) == !c->negate;
}
case CONDITION_KERNEL_COMMAND_LINE:
return condition_test_kernel_command_line(c);
case CONDITION_VIRTUALIZATION:
return condition_test_virtualization(c);
case CONDITION_SECURITY:
return condition_test_security(c);
case CONDITION_CAPABILITY:
return condition_test_capability(c);
case CONDITION_HOST:
return condition_test_host(c);
case CONDITION_AC_POWER:
return condition_test_ac_power(c);
case CONDITION_ARCHITECTURE:
return condition_test_architecture(c);
case CONDITION_NEEDS_UPDATE:
return condition_test_needs_update(c);
case CONDITION_FIRST_BOOT:
return condition_test_first_boot(c);
case CONDITION_NULL:
return !c->negate;
default:
assert_not_reached("Invalid condition type.");
}
}
