diff options
Diffstat (limited to 'src/systemctl/systemctl-start-unit.c')
| -rw-r--r-- | src/systemctl/systemctl-start-unit.c | 368 |
1 files changed, 368 insertions, 0 deletions
diff --git a/src/systemctl/systemctl-start-unit.c b/src/systemctl/systemctl-start-unit.c new file mode 100644 index 0000000..b398e77 --- /dev/null +++ b/src/systemctl/systemctl-start-unit.c @@ -0,0 +1,368 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include "sd-bus.h" + +#include "bus-common-errors.h" +#include "bus-error.h" +#include "bus-locator.h" +#include "bus-util.h" +#include "bus-wait-for-jobs.h" +#include "bus-wait-for-units.h" +#include "macro.h" +#include "special.h" +#include "string-util.h" +#include "systemctl-start-unit.h" +#include "systemctl-util.h" +#include "systemctl.h" +#include "terminal-util.h" + +static const struct { + const char *verb; /* systemctl verb */ + const char *method; /* Name of the specific D-Bus method */ + const char *job_type; /* Job type when passing to the generic EnqueueUnitJob() method */ +} unit_actions[] = { + { "start", "StartUnit", "start" }, + { "stop", "StopUnit", "stop" }, + { "condstop", "StopUnit", "stop" }, /* legacy alias */ + { "reload", "ReloadUnit", "reload" }, + { "restart", "RestartUnit", "restart" }, + { "try-restart", "TryRestartUnit", "try-restart" }, + { "condrestart", "TryRestartUnit", "try-restart" }, /* legacy alias */ + { "reload-or-restart", "ReloadOrRestartUnit", "reload-or-restart" }, + { "try-reload-or-restart", "ReloadOrTryRestartUnit", "reload-or-try-restart" }, + { "reload-or-try-restart", "ReloadOrTryRestartUnit", "reload-or-try-restart" }, /* legacy alias */ + { "condreload", "ReloadOrTryRestartUnit", "reload-or-try-restart" }, /* legacy alias */ + { "force-reload", "ReloadOrTryRestartUnit", "reload-or-try-restart" }, /* legacy alias */ +}; + +static const char *verb_to_method(const char *verb) { + size_t i; + + for (i = 0; i < ELEMENTSOF(unit_actions); i++) + if (streq_ptr(unit_actions[i].verb, verb)) + return unit_actions[i].method; + + return "StartUnit"; +} + +static const char *verb_to_job_type(const char *verb) { + size_t i; + + for (i = 0; i < ELEMENTSOF(unit_actions); i++) + if (streq_ptr(unit_actions[i].verb, verb)) + return unit_actions[i].job_type; + + return "start"; +} + +static int start_unit_one( + sd_bus *bus, + const char *method, /* When using classic per-job bus methods */ + const char *job_type, /* When using new-style EnqueueUnitJob() */ + const char *name, + const char *mode, + sd_bus_error *error, + BusWaitForJobs *w, + BusWaitForUnits *wu) { + + _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL; + const char *path; + bool done = false; + int r; + + assert(method); + assert(name); + assert(mode); + assert(error); + + log_debug("%s dbus call org.freedesktop.systemd1.Manager %s(%s, %s)", + arg_dry_run ? "Would execute" : "Executing", + method, name, mode); + + if (arg_dry_run) + return 0; + + if (arg_show_transaction) { + _cleanup_(sd_bus_error_free) sd_bus_error enqueue_error = SD_BUS_ERROR_NULL; + + /* Use the new, fancy EnqueueUnitJob() API if the user wants us to print the transaction */ + r = bus_call_method( + bus, + bus_systemd_mgr, + "EnqueueUnitJob", + &enqueue_error, + &reply, + "sss", + name, job_type, mode); + if (r < 0) { + if (!sd_bus_error_has_name(&enqueue_error, SD_BUS_ERROR_UNKNOWN_METHOD)) { + (void) sd_bus_error_move(error, &enqueue_error); + goto fail; + } + + /* Hmm, the API is not yet available. Let's use the classic API instead (see below). */ + log_notice("--show-transaction not supported by this service manager, proceeding without."); + } else { + const char *u, *jt; + uint32_t id; + + r = sd_bus_message_read(reply, "uosos", &id, &path, &u, NULL, &jt); + if (r < 0) + return bus_log_parse_error(r); + + log_info("Enqueued anchor job %" PRIu32 " %s/%s.", id, u, jt); + + r = sd_bus_message_enter_container(reply, 'a', "(uosos)"); + if (r < 0) + return bus_log_parse_error(r); + for (;;) { + r = sd_bus_message_read(reply, "(uosos)", &id, NULL, &u, NULL, &jt); + if (r < 0) + return bus_log_parse_error(r); + if (r == 0) + break; + + log_info("Enqueued auxiliary job %" PRIu32 " %s/%s.", id, u, jt); + } + + r = sd_bus_message_exit_container(reply); + if (r < 0) + return bus_log_parse_error(r); + + done = true; + } + } + + if (!done) { + r = bus_call_method(bus, bus_systemd_mgr, method, error, &reply, "ss", name, mode); + if (r < 0) + goto fail; + + r = sd_bus_message_read(reply, "o", &path); + if (r < 0) + return bus_log_parse_error(r); + } + + if (need_daemon_reload(bus, name) > 0) + warn_unit_file_changed(name); + + if (w) { + log_debug("Adding %s to the set", path); + r = bus_wait_for_jobs_add(w, path); + if (r < 0) + return log_error_errno(r, "Failed to watch job for %s: %m", name); + } + + if (wu) { + r = bus_wait_for_units_add_unit(wu, name, BUS_WAIT_FOR_INACTIVE|BUS_WAIT_NO_JOB, NULL, NULL); + if (r < 0) + return log_error_errno(r, "Failed to watch unit %s: %m", name); + } + + return 0; + +fail: + /* There's always a fallback possible for legacy actions. */ + if (arg_action != ACTION_SYSTEMCTL) + return r; + + log_error_errno(r, "Failed to %s %s: %s", job_type, name, bus_error_message(error, r)); + + if (!sd_bus_error_has_names(error, BUS_ERROR_NO_SUCH_UNIT, + BUS_ERROR_UNIT_MASKED, + BUS_ERROR_JOB_TYPE_NOT_APPLICABLE)) + log_error("See %s logs and 'systemctl%s status%s %s' for details.", + arg_scope == UNIT_FILE_SYSTEM ? "system" : "user", + arg_scope == UNIT_FILE_SYSTEM ? "" : " --user", + name[0] == '-' ? " --" : "", + name); + + return r; +} + +const struct action_metadata action_table[_ACTION_MAX] = { + [ACTION_HALT] = { SPECIAL_HALT_TARGET, "halt", "replace-irreversibly" }, + [ACTION_POWEROFF] = { SPECIAL_POWEROFF_TARGET, "poweroff", "replace-irreversibly" }, + [ACTION_REBOOT] = { SPECIAL_REBOOT_TARGET, "reboot", "replace-irreversibly" }, + [ACTION_KEXEC] = { SPECIAL_KEXEC_TARGET, "kexec", "replace-irreversibly" }, + [ACTION_RUNLEVEL2] = { SPECIAL_MULTI_USER_TARGET, NULL, "isolate" }, + [ACTION_RUNLEVEL3] = { SPECIAL_MULTI_USER_TARGET, NULL, "isolate" }, + [ACTION_RUNLEVEL4] = { SPECIAL_MULTI_USER_TARGET, NULL, "isolate" }, + [ACTION_RUNLEVEL5] = { SPECIAL_GRAPHICAL_TARGET, NULL, "isolate" }, + [ACTION_RESCUE] = { SPECIAL_RESCUE_TARGET, "rescue", "isolate" }, + [ACTION_EMERGENCY] = { SPECIAL_EMERGENCY_TARGET, "emergency", "isolate" }, + [ACTION_DEFAULT] = { SPECIAL_DEFAULT_TARGET, "default", "isolate" }, + [ACTION_EXIT] = { SPECIAL_EXIT_TARGET, "exit", "replace-irreversibly" }, + [ACTION_SUSPEND] = { SPECIAL_SUSPEND_TARGET, "suspend", "replace-irreversibly" }, + [ACTION_HIBERNATE] = { SPECIAL_HIBERNATE_TARGET, "hibernate", "replace-irreversibly" }, + [ACTION_HYBRID_SLEEP] = { SPECIAL_HYBRID_SLEEP_TARGET, "hybrid-sleep", "replace-irreversibly" }, + [ACTION_SUSPEND_THEN_HIBERNATE] = { SPECIAL_SUSPEND_THEN_HIBERNATE_TARGET, "suspend-then-hibernate", "replace-irreversibly" }, +}; + +enum action verb_to_action(const char *verb) { + enum action i; + + for (i = 0; i < _ACTION_MAX; i++) + if (streq_ptr(action_table[i].verb, verb)) + return i; + + return _ACTION_INVALID; +} + +static const char** make_extra_args(const char *extra_args[static 4]) { + size_t n = 0; + + assert(extra_args); + + if (arg_scope != UNIT_FILE_SYSTEM) + extra_args[n++] = "--user"; + + if (arg_transport == BUS_TRANSPORT_REMOTE) { + extra_args[n++] = "-H"; + extra_args[n++] = arg_host; + } else if (arg_transport == BUS_TRANSPORT_MACHINE) { + extra_args[n++] = "-M"; + extra_args[n++] = arg_host; + } else + assert(arg_transport == BUS_TRANSPORT_LOCAL); + + extra_args[n] = NULL; + return extra_args; +} + +int start_unit(int argc, char *argv[], void *userdata) { + _cleanup_(bus_wait_for_units_freep) BusWaitForUnits *wu = NULL; + _cleanup_(bus_wait_for_jobs_freep) BusWaitForJobs *w = NULL; + const char *method, *job_type, *mode, *one_name, *suffix = NULL; + _cleanup_free_ char **stopped_units = NULL; /* Do not use _cleanup_strv_free_ */ + _cleanup_strv_free_ char **names = NULL; + int r, ret = EXIT_SUCCESS; + sd_bus *bus; + char **name; + + if (arg_wait && !STR_IN_SET(argv[0], "start", "restart")) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "--wait may only be used with the 'start' or 'restart' commands."); + + /* We cannot do sender tracking on the private bus, so we need the full one for RefUnit to implement + * --wait */ + r = acquire_bus(arg_wait ? BUS_FULL : BUS_MANAGER, &bus); + if (r < 0) + return r; + + ask_password_agent_open_maybe(); + polkit_agent_open_maybe(); + + if (arg_action == ACTION_SYSTEMCTL) { + enum action action; + + action = verb_to_action(argv[0]); + + if (action != _ACTION_INVALID) { + /* A command in style "systemctl reboot", "systemctl poweroff", … */ + method = "StartUnit"; + job_type = "start"; + mode = action_table[action].mode; + one_name = action_table[action].target; + } else { + if (streq(argv[0], "isolate")) { + /* A "systemctl isolate <unit1> <unit2> …" command */ + method = "StartUnit"; + job_type = "start"; + mode = "isolate"; + suffix = ".target"; + } else { + /* A command in style of "systemctl start <unit1> <unit2> …", "sysemctl stop <unit1> <unit2> …" and so on */ + method = verb_to_method(argv[0]); + job_type = verb_to_job_type(argv[0]); + mode = arg_job_mode; + } + one_name = NULL; + } + } else { + /* A SysV legacy command such as "halt", "reboot", "poweroff", … */ + assert(arg_action >= 0 && arg_action < _ACTION_MAX); + assert(action_table[arg_action].target); + assert(action_table[arg_action].mode); + + method = "StartUnit"; + job_type = "start"; + mode = action_table[arg_action].mode; + one_name = action_table[arg_action].target; + } + + if (one_name) { + names = strv_new(one_name); + if (!names) + return log_oom(); + } else { + bool expanded; + + r = expand_unit_names(bus, strv_skip(argv, 1), suffix, &names, &expanded); + if (r < 0) + return log_error_errno(r, "Failed to expand names: %m"); + + if (!arg_all && expanded && streq(job_type, "start") && !arg_quiet) { + log_warning("Warning: %ssystemctl start called with a glob pattern.%s", + ansi_highlight_red(), + ansi_normal()); + log_notice("Hint: unit globs expand to loaded units, so start will usually have no effect.\n" + " Passing --all will also load units which are pulled in by other units.\n" + " See systemctl(1) for more details."); + } + } + + if (!arg_no_block) { + r = bus_wait_for_jobs_new(bus, &w); + if (r < 0) + return log_error_errno(r, "Could not watch jobs: %m"); + } + + if (arg_wait) { + r = bus_call_method_async(bus, NULL, bus_systemd_mgr, "Subscribe", NULL, NULL, NULL); + if (r < 0) + return log_error_errno(r, "Failed to enable subscription: %m"); + + r = bus_wait_for_units_new(bus, &wu); + if (r < 0) + return log_error_errno(r, "Failed to allocate unit watch context: %m"); + } + + STRV_FOREACH(name, names) { + _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; + + r = start_unit_one(bus, method, job_type, *name, mode, &error, w, wu); + if (ret == EXIT_SUCCESS && r < 0) + ret = translate_bus_error_to_exit_status(r, &error); + + if (r >= 0 && streq(method, "StopUnit")) { + r = strv_push(&stopped_units, *name); + if (r < 0) + return log_oom(); + } + } + + if (!arg_no_block) { + const char* extra_args[4]; + + r = bus_wait_for_jobs(w, arg_quiet, make_extra_args(extra_args)); + if (r < 0) + return r; + + /* When stopping units, warn if they can still be triggered by + * another active unit (socket, path, timer) */ + if (!arg_quiet) + STRV_FOREACH(name, stopped_units) + (void) check_triggering_units(bus, *name); + } + + if (arg_wait) { + r = bus_wait_for_units_run(wu); + if (r < 0) + return log_error_errno(r, "Failed to wait for units: %m"); + if (r == BUS_WAIT_FAILURE && ret == EXIT_SUCCESS) + ret = EXIT_FAILURE; + } + + return ret; +} |