daf71ef61c
This is just some refactoring: shifting around of code, not change in codeflow. This splits up the way too huge systemctl.c in multiple more easily digestable files. It roughly follows the rule that each family of verbs gets its own .c/.h file pair, and so do all the compat executable names we support. Plus three extra files for sysv compat (which existed before already, but I renamed slightly, to get the systemctl- prefix lik everything else), a -util file with generic stuff everything uses, and a -logind file with everything that talks directly to logind instead of PID1. systemctl is still a bit too complex for my taste, but I think this way itc omes in a more digestable bits at least. No change of behaviour, just reshuffling of some code.
78 lines
2.7 KiB
C
78 lines
2.7 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
|
|
|
|
#include "bus-error.h"
|
|
#include "bus-locator.h"
|
|
#include "parse-util.h"
|
|
#include "path-util.h"
|
|
#include "proc-cmdline.h"
|
|
#include "signal-util.h"
|
|
#include "stat-util.h"
|
|
#include "systemctl-switch-root.h"
|
|
#include "systemctl-util.h"
|
|
#include "systemctl.h"
|
|
|
|
int switch_root(int argc, char *argv[], void *userdata) {
|
|
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
|
|
_cleanup_free_ char *cmdline_init = NULL;
|
|
const char *root, *init;
|
|
sd_bus *bus;
|
|
int r;
|
|
|
|
if (arg_transport != BUS_TRANSPORT_LOCAL)
|
|
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Cannot switch root remotely.");
|
|
|
|
if (argc < 2 || argc > 3)
|
|
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Wrong number of arguments.");
|
|
|
|
root = argv[1];
|
|
|
|
if (argc >= 3)
|
|
init = argv[2];
|
|
else {
|
|
r = proc_cmdline_get_key("init", 0, &cmdline_init);
|
|
if (r < 0)
|
|
log_debug_errno(r, "Failed to parse /proc/cmdline: %m");
|
|
|
|
init = cmdline_init;
|
|
}
|
|
|
|
init = empty_to_null(init);
|
|
if (init) {
|
|
const char *root_systemd_path = NULL, *root_init_path = NULL;
|
|
|
|
root_systemd_path = prefix_roota(root, "/" SYSTEMD_BINARY_PATH);
|
|
root_init_path = prefix_roota(root, init);
|
|
|
|
/* If the passed init is actually the same as the systemd binary, then let's suppress it. */
|
|
if (files_same(root_init_path, root_systemd_path, 0) > 0)
|
|
init = NULL;
|
|
}
|
|
|
|
/* Instruct PID1 to exclude us from its killing spree applied during the transition. Otherwise we
|
|
* would exit with a failure status even though the switch to the new root has succeed. */
|
|
assert(saved_argv);
|
|
assert(saved_argv[0]);
|
|
saved_argv[0][0] = '@';
|
|
|
|
r = acquire_bus(BUS_MANAGER, &bus);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* If we are slow to exit after the root switch, the new systemd instance will send us a signal to
|
|
* terminate. Just ignore it and exit normally. This way the unit does not end up as failed. */
|
|
r = ignore_signals(SIGTERM, -1);
|
|
if (r < 0)
|
|
log_warning_errno(r, "Failed to change disposition of SIGTERM to ignore: %m");
|
|
|
|
log_debug("Switching root - root: %s; init: %s", root, strna(init));
|
|
|
|
r = bus_call_method(bus, bus_systemd_mgr, "SwitchRoot", &error, NULL, "ss", root, init);
|
|
if (r < 0) {
|
|
(void) default_signals(SIGTERM, -1);
|
|
|
|
return log_error_errno(r, "Failed to switch root: %s", bus_error_message(&error, r));
|
|
}
|
|
|
|
return 0;
|
|
}
|