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-rw-r--r--src/systemctl/systemctl-start-special.c248
1 files changed, 248 insertions, 0 deletions
diff --git a/src/systemctl/systemctl-start-special.c b/src/systemctl/systemctl-start-special.c
new file mode 100644
index 0000000000..46f58ff921
--- /dev/null
+++ b/src/systemctl/systemctl-start-special.c
@@ -0,0 +1,248 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include "bootspec.h"
+#include "bus-error.h"
+#include "bus-locator.h"
+#include "efivars.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "process-util.h"
+#include "reboot-util.h"
+#include "systemctl-logind.h"
+#include "systemctl-start-special.h"
+#include "systemctl-start-unit.h"
+#include "systemctl-trivial-method.h"
+#include "systemctl-util.h"
+#include "systemctl.h"
+
+static int load_kexec_kernel(void) {
+ _cleanup_(boot_config_free) BootConfig config = {};
+ _cleanup_free_ char *kernel = NULL, *initrd = NULL, *options = NULL;
+ const BootEntry *e;
+ pid_t pid;
+ int r;
+
+ if (kexec_loaded()) {
+ log_debug("Kexec kernel already loaded.");
+ return 0;
+ }
+
+ if (access(KEXEC, X_OK) < 0)
+ return log_error_errno(errno, KEXEC" is not available: %m");
+
+ r = boot_entries_load_config_auto(NULL, NULL, &config);
+ if (r == -ENOKEY)
+ /* The call doesn't log about ENOKEY, let's do so here. */
+ return log_error_errno(r,
+ "No kexec kernel loaded and autodetection failed.\n%s",
+ is_efi_boot()
+ ? "Cannot automatically load kernel: ESP partition mount point not found."
+ : "Automatic loading works only on systems booted with EFI.");
+ if (r < 0)
+ return r;
+
+ e = boot_config_default_entry(&config);
+ if (!e)
+ return log_error_errno(SYNTHETIC_ERRNO(ENOENT),
+ "No boot loader entry suitable as default, refusing to guess.");
+
+ log_debug("Found default boot loader entry in file \"%s\"", e->path);
+
+ if (!e->kernel)
+ return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
+ "Boot entry does not refer to Linux kernel, which is not supported currently.");
+ if (strv_length(e->initrd) > 1)
+ return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
+ "Boot entry specifies multiple initrds, which is not supported currently.");
+
+ kernel = path_join(e->root, e->kernel);
+ if (!kernel)
+ return log_oom();
+
+ if (!strv_isempty(e->initrd)) {
+ initrd = path_join(e->root, e->initrd[0]);
+ if (!initrd)
+ return log_oom();
+ }
+
+ options = strv_join(e->options, " ");
+ if (!options)
+ return log_oom();
+
+ log_full(arg_quiet ? LOG_DEBUG : LOG_INFO,
+ "%s "KEXEC" --load \"%s\" --append \"%s\"%s%s%s",
+ arg_dry_run ? "Would run" : "Running",
+ kernel,
+ options,
+ initrd ? " --initrd \"" : NULL, strempty(initrd), initrd ? "\"" : "");
+ if (arg_dry_run)
+ return 0;
+
+ r = safe_fork("(kexec)", FORK_WAIT|FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_RLIMIT_NOFILE_SAFE|FORK_LOG, &pid);
+ if (r < 0)
+ return r;
+ if (r == 0) {
+ const char* const args[] = {
+ KEXEC,
+ "--load", kernel,
+ "--append", options,
+ initrd ? "--initrd" : NULL, initrd,
+ NULL
+ };
+
+ /* Child */
+ execv(args[0], (char * const *) args);
+ _exit(EXIT_FAILURE);
+ }
+
+ return 0;
+}
+
+static int set_exit_code(uint8_t code) {
+ _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+ sd_bus *bus;
+ int r;
+
+ r = acquire_bus(BUS_MANAGER, &bus);
+ if (r < 0)
+ return r;
+
+ r = bus_call_method(bus, bus_systemd_mgr, "SetExitCode", &error, NULL, "y", code);
+ if (r < 0)
+ return log_error_errno(r, "Failed to set exit code: %s", bus_error_message(&error, r));
+
+ return 0;
+}
+
+int start_special(int argc, char *argv[], void *userdata) {
+ bool termination_action; /* An action that terminates the manager, can be performed also by
+ * signal. */
+ enum action a;
+ int r;
+
+ assert(argv);
+
+ a = verb_to_action(argv[0]);
+
+ r = logind_check_inhibitors(a);
+ if (r < 0)
+ return r;
+
+ if (arg_force >= 2) {
+ r = must_be_root();
+ if (r < 0)
+ return r;
+ }
+
+ r = prepare_firmware_setup();
+ if (r < 0)
+ return r;
+
+ r = prepare_boot_loader_menu();
+ if (r < 0)
+ return r;
+
+ r = prepare_boot_loader_entry();
+ if (r < 0)
+ return r;
+
+ if (a == ACTION_REBOOT) {
+ const char *arg = NULL;
+
+ if (argc > 1) {
+ if (arg_reboot_argument)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Both --reboot-argument= and positional argument passed to reboot command, refusing.");
+
+ log_notice("Positional argument to reboot command is deprecated, please use --reboot-argument= instead. Accepting anyway.");
+ arg = argv[1];
+ } else
+ arg = arg_reboot_argument;
+
+ if (arg) {
+ r = update_reboot_parameter_and_warn(arg, false);
+ if (r < 0)
+ return r;
+ }
+
+ } else if (a == ACTION_KEXEC) {
+ r = load_kexec_kernel();
+ if (r < 0 && arg_force >= 1)
+ log_notice("Failed to load kexec kernel, continuing without.");
+ else if (r < 0)
+ return r;
+
+ } else if (a == ACTION_EXIT && argc > 1) {
+ uint8_t code;
+
+ /* If the exit code is not given on the command line, don't reset it to zero: just keep it as
+ * it might have been set previously. */
+
+ r = safe_atou8(argv[1], &code);
+ if (r < 0)
+ return log_error_errno(r, "Invalid exit code.");
+
+ r = set_exit_code(code);
+ if (r < 0)
+ return r;
+ }
+
+ termination_action = IN_SET(a,
+ ACTION_HALT,
+ ACTION_POWEROFF,
+ ACTION_REBOOT);
+ if (termination_action && arg_force >= 2)
+ return halt_now(a);
+
+ if (arg_force >= 1 &&
+ (termination_action || IN_SET(a, ACTION_KEXEC, ACTION_EXIT)))
+ r = trivial_method(argc, argv, userdata);
+ else {
+ /* First try logind, to allow authentication with polkit */
+ if (IN_SET(a,
+ ACTION_POWEROFF,
+ ACTION_REBOOT,
+ ACTION_HALT,
+ ACTION_SUSPEND,
+ ACTION_HIBERNATE,
+ ACTION_HYBRID_SLEEP,
+ ACTION_SUSPEND_THEN_HIBERNATE)) {
+
+ r = logind_reboot(a);
+ if (r >= 0)
+ return r;
+ if (IN_SET(r, -EOPNOTSUPP, -EINPROGRESS))
+ /* Requested operation is not supported or already in progress */
+ return r;
+
+ /* On all other errors, try low-level operation. In order to minimize the difference
+ * between operation with and without logind, we explicitly enable non-blocking mode
+ * for this, as logind's shutdown operations are always non-blocking. */
+
+ arg_no_block = true;
+
+ } else if (IN_SET(a, ACTION_EXIT, ACTION_KEXEC))
+ /* Since exit/kexec are so close in behaviour to power-off/reboot, let's also make
+ * them asynchronous, in order to not confuse the user needlessly with unexpected
+ * behaviour. */
+ arg_no_block = true;
+
+ r = start_unit(argc, argv, userdata);
+ }
+
+ if (termination_action && arg_force < 2 &&
+ IN_SET(r, -ENOENT, -ETIMEDOUT))
+ log_notice("It is possible to perform action directly, see discussion of --force --force in man:systemctl(1).");
+
+ return r;
+}
+
+int start_system_special(int argc, char *argv[], void *userdata) {
+ /* Like start_special above, but raises an error when running in user mode */
+
+ if (arg_scope != UNIT_FILE_SYSTEM)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Bad action for %s mode.",
+ arg_scope == UNIT_FILE_GLOBAL ? "--global" : "--user");
+
+ return start_special(argc, argv, userdata);
+}
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