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Convert PID1 to option macros (#42099)

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This commit is contained in:
Zbigniew Jędrzejewski-Szmek
2026-05-15 13:39:36 +02:00
committed by GitHub
parent dad6c71728 09f107c811
commit dca9ab5b92
8 changed files with 248 additions and 314 deletions
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src/core/main.c
+184 -215
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@@ -1,7 +1,6 @@
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <fcntl.h>
#include <getopt.h>
#include <linux/oom.h>
#include <linux/vt.h>
#include <stdlib.h>
@@ -19,6 +18,7 @@
#include "sd-messages.h"
#include "alloc-util.h"
#include "ansi-color.h"
#include "apparmor-setup.h"
#include "architecture.h"
#include "argv-util.h"
@@ -47,8 +47,10 @@
#include "fd-util.h"
#include "fdset.h"
#include "fileio.h"
#include "format-table.h"
#include "format-util.h"
#include "getopt-defs.h"
#include "glyph-util.h"
#include "help-util.h"
#include "hexdecoct.h"
#include "hostname-setup.h"
#include "id128-util.h"
@@ -73,13 +75,13 @@
#include "mkdir-label.h"
#include "mount-setup.h"
#include "mount-util.h"
#include "options.h"
#include "os-util.h"
#include "osc-context.h"
#include "pager.h"
#include "parse-argument.h"
#include "parse-util.h"
#include "path-util.h"
#include "pretty-print.h"
#include "proc-cmdline.h"
#include "process-util.h"
#include "random-util.h"
@@ -994,249 +996,236 @@ static void set_manager_settings(Manager *m) {
}
static int parse_argv(int argc, char *argv[]) {
enum {
COMMON_GETOPT_ARGS,
SYSTEMD_GETOPT_ARGS,
};
static const struct option options[] = {
COMMON_GETOPT_OPTIONS,
SYSTEMD_GETOPT_OPTIONS,
{}
};
int c, r;
bool user_arg_seen = false;
int r;
assert(argc >= 1);
assert(argv);
if (getpid_cached() == 1)
opterr = 0;
int log_level_shift = getpid_cached() == 1 ? LOG_DEBUG - LOG_ERR : 0;
OptionParser opts = { argc, argv, .log_level_shift = log_level_shift };
while ((c = getopt_long(argc, argv, SYSTEMD_GETOPT_SHORT_OPTIONS, options, NULL)) >= 0)
/* Note: when new options are added here, also add them to the exclusion list in proc-cmdline.c! */
FOREACH_OPTION(c, &opts)
switch (c) {
case ARG_LOG_LEVEL:
r = log_set_max_level_from_string(optarg);
if (r < 0)
return log_error_errno(r, "Failed to parse log level \"%s\": %m", optarg);
OPTION_COMMON_HELP:
arg_action = ACTION_HELP;
break;
case ARG_LOG_TARGET:
r = log_set_target_from_string(optarg);
if (r < 0)
return log_error_errno(r, "Failed to parse log target \"%s\": %m", optarg);
OPTION_COMMON_VERSION:
arg_action = ACTION_VERSION;
break;
case ARG_LOG_COLOR:
if (optarg) {
r = log_show_color_from_string(optarg);
if (r < 0)
return log_error_errno(r, "Failed to parse log color setting \"%s\": %m",
optarg);
} else
log_show_color(true);
OPTION_LONG("test", NULL, "Determine initial transaction, dump it and exit"):
arg_action = ACTION_TEST;
break;
case ARG_LOG_LOCATION:
if (optarg) {
r = log_show_location_from_string(optarg);
if (r < 0)
return log_error_errno(r, "Failed to parse log location setting \"%s\": %m",
optarg);
} else
log_show_location(true);
break;
case ARG_LOG_TIME:
if (optarg) {
r = log_show_time_from_string(optarg);
if (r < 0)
return log_error_errno(r, "Failed to parse log time setting \"%s\": %m",
optarg);
} else
log_show_time(true);
break;
case ARG_DEFAULT_STD_OUTPUT:
r = exec_output_from_string(optarg);
if (r < 0)
return log_error_errno(r, "Failed to parse default standard output setting \"%s\": %m",
optarg);
arg_defaults.std_output = r;
break;
case ARG_DEFAULT_STD_ERROR:
r = exec_output_from_string(optarg);
if (r < 0)
return log_error_errno(r, "Failed to parse default standard error output setting \"%s\": %m",
optarg);
arg_defaults.std_error = r;
break;
case ARG_UNIT:
r = free_and_strdup(&arg_default_unit, optarg);
if (r < 0)
return log_error_errno(r, "Failed to set default unit \"%s\": %m", optarg);
break;
case ARG_SYSTEM:
OPTION_LONG("system", NULL, "Combined with --test: operate in system mode"):
arg_runtime_scope = RUNTIME_SCOPE_SYSTEM;
break;
case ARG_USER:
OPTION_LONG("user", NULL, "Combined with --test: operate in user mode"):
arg_runtime_scope = RUNTIME_SCOPE_USER;
user_arg_seen = true;
break;
case ARG_TEST:
arg_action = ACTION_TEST;
break;
case ARG_NO_PAGER:
arg_pager_flags |= PAGER_DISABLE;
break;
case ARG_VERSION:
arg_action = ACTION_VERSION;
break;
case ARG_DUMP_CONFIGURATION_ITEMS:
OPTION_LONG("dump-configuration-items", NULL, "Dump understood unit configuration items"):
arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
break;
case ARG_DUMP_BUS_PROPERTIES:
OPTION_LONG("dump-bus-properties", NULL, "Dump exposed bus properties"):
arg_action = ACTION_DUMP_BUS_PROPERTIES;
break;
case ARG_BUS_INTROSPECT:
arg_bus_introspect = optarg;
OPTION_LONG("bus-introspect", "PATH", "Write XML introspection data"):
arg_bus_introspect = opts.arg;
arg_action = ACTION_BUS_INTROSPECT;
break;
case ARG_DUMP_CORE:
r = parse_boolean_argument("--dump-core", optarg, &arg_dump_core);
OPTION_LONG("unit", "UNIT", "Set default unit"):
r = free_and_strdup(&arg_default_unit, opts.arg);
if (r < 0)
return log_error_errno(r, "Failed to set default unit \"%s\": %m", opts.arg);
break;
OPTION_LONG_FLAGS(OPTION_OPTIONAL_ARG, "dump-core", "BOOL", "Dump core on crash"):
r = parse_boolean_argument("--dump-core", opts.arg, &arg_dump_core);
if (r < 0)
return r;
break;
case ARG_CRASH_CHVT:
r = parse_crash_chvt(optarg, &arg_crash_chvt);
OPTION_LONG("crash-chvt", "NR", "Change to specified VT on crash"): {}
OPTION_LONG("crash-vt", "NR", /* help= */ NULL): /* compat option that was previously documented in --help */
r = parse_crash_chvt(opts.arg, &arg_crash_chvt);
if (r < 0)
return log_error_errno(r, "Failed to parse crash virtual terminal index: \"%s\": %m",
optarg);
return log_error_errno(r, "Failed to parse crash virtual terminal index '%s': %m",
opts.arg);
break;
case ARG_CRASH_SHELL:
r = parse_boolean_argument("--crash-shell", optarg, &arg_crash_shell);
OPTION_LONG("crash-action", "ACTION", "Specify what to do on crash"):
r = crash_action_from_string(opts.arg);
if (r < 0)
return log_error_errno(r, "Failed to parse crash action \"%s\": %m", opts.arg);
arg_crash_action = r;
break;
OPTION_LONG_FLAGS(OPTION_OPTIONAL_ARG, "crash-shell", "BOOL", "Run shell on crash"):
r = parse_boolean_argument("--crash-shell", opts.arg, &arg_crash_shell);
if (r < 0)
return r;
break;
case ARG_CRASH_REBOOT:
r = parse_boolean_argument("--crash-reboot", optarg, NULL);
OPTION_LONG_FLAGS(OPTION_OPTIONAL_ARG, "confirm-spawn", "BOOL",
"Ask for confirmation when spawning processes"):
arg_confirm_spawn = mfree(arg_confirm_spawn);
r = parse_confirm_spawn(opts.arg, &arg_confirm_spawn);
if (r < 0)
return log_error_errno(r, "Failed to parse confirm spawn option: \"%s\": %m",
opts.arg);
break;
OPTION_LONG_FLAGS(OPTION_OPTIONAL_ARG, "show-status", "BOOL",
"Show status updates on the console during boot"):
if (opts.arg) {
r = parse_show_status(opts.arg, &arg_show_status);
if (r < 0)
return log_error_errno(r, "Failed to parse show status boolean: \"%s\": %m",
opts.arg);
} else
arg_show_status = SHOW_STATUS_YES;
break;
OPTION_LONG("log-target", "TARGET",
"Set log target (console, journal, kmsg, journal-or-kmsg, null)"):
r = log_set_target_from_string(opts.arg);
if (r < 0)
return log_error_errno(r, "Failed to parse log target \"%s\": %m", opts.arg);
break;
OPTION_LONG("log-level", "LEVEL",
"Set log level (debug, info, notice, warning, err, crit, alert, emerg)"):
r = log_set_max_level_from_string(opts.arg);
if (r < 0)
return log_error_errno(r, "Failed to parse log level \"%s\": %m", opts.arg);
break;
OPTION_LONG_FLAGS(OPTION_OPTIONAL_ARG, "log-color", "BOOL", "Highlight important log messages"):
if (opts.arg) {
r = log_show_color_from_string(opts.arg);
if (r < 0)
return log_error_errno(r, "Failed to parse log color setting \"%s\": %m",
opts.arg);
} else
log_show_color(true);
break;
OPTION_LONG_FLAGS(OPTION_OPTIONAL_ARG, "log-location", "BOOL",
"Include code location in log messages"):
if (opts.arg) {
r = log_show_location_from_string(opts.arg);
if (r < 0)
return log_error_errno(r, "Failed to parse log location setting \"%s\": %m",
opts.arg);
} else
log_show_location(true);
break;
OPTION_LONG_FLAGS(OPTION_OPTIONAL_ARG, "log-time", "BOOL", "Prefix log messages with current time"):
if (opts.arg) {
r = log_show_time_from_string(opts.arg);
if (r < 0)
return log_error_errno(r, "Failed to parse log time setting \"%s\": %m",
opts.arg);
} else
log_show_time(true);
break;
OPTION_LONG("default-standard-output", "…", "Set default standard output for services"):
r = exec_output_from_string(opts.arg);
if (r < 0)
return log_error_errno(r, "Failed to parse default standard output setting \"%s\": %m",
opts.arg);
arg_defaults.std_output = r;
break;
OPTION_LONG("default-standard-error", "…", "Set default standard error output for services"):
r = exec_output_from_string(opts.arg);
if (r < 0)
return log_error_errno(r, "Failed to parse default standard error output setting \"%s\": %m",
opts.arg);
arg_defaults.std_error = r;
break;
OPTION_COMMON_NO_PAGER:
arg_pager_flags |= PAGER_DISABLE;
break;
/* Options not shown in --help. */
OPTION_LONG_FLAGS(OPTION_OPTIONAL_ARG, "crash-reboot", "BOOL", /* help= */ NULL):
r = parse_boolean_argument("--crash-reboot", opts.arg, NULL);
if (r < 0)
return r;
arg_crash_action = r > 0 ? CRASH_REBOOT : CRASH_FREEZE;
break;
case ARG_CRASH_ACTION:
r = crash_action_from_string(optarg);
if (r < 0)
return log_error_errno(r, "Failed to parse crash action \"%s\": %m", optarg);
arg_crash_action = r;
break;
case ARG_CONFIRM_SPAWN:
arg_confirm_spawn = mfree(arg_confirm_spawn);
r = parse_confirm_spawn(optarg, &arg_confirm_spawn);
if (r < 0)
return log_error_errno(r, "Failed to parse confirm spawn option: \"%s\": %m",
optarg);
break;
case ARG_SERVICE_WATCHDOGS:
r = parse_boolean_argument("--service-watchdogs=", optarg, &arg_service_watchdogs);
OPTION_LONG("service-watchdogs", "BOOL", /* help= */ NULL):
r = parse_boolean_argument("--service-watchdogs=", opts.arg, &arg_service_watchdogs);
if (r < 0)
return r;
break;
case ARG_SHOW_STATUS:
if (optarg) {
r = parse_show_status(optarg, &arg_show_status);
if (r < 0)
return log_error_errno(r, "Failed to parse show status boolean: \"%s\": %m",
optarg);
} else
arg_show_status = SHOW_STATUS_YES;
break;
case ARG_DESERIALIZE: {
int fd;
FILE *f;
fd = parse_fd(optarg);
OPTION_LONG("deserialize", "FD", /* help= */ NULL): {
int fd = parse_fd(opts.arg);
if (fd < 0)
return log_error_errno(fd, "Failed to parse serialization fd \"%s\": %m", optarg);
return log_error_errno(fd, "Failed to parse serialization fd \"%s\": %m", opts.arg);
(void) fd_cloexec(fd, true);
f = fdopen(fd, "r");
FILE *f = fdopen(fd, "r");
if (!f)
return log_error_errno(errno, "Failed to open serialization fd %d: %m", fd);
safe_fclose(arg_serialization);
arg_serialization = f;
break;
}
case ARG_SWITCHED_ROOT:
OPTION_LONG("switched-root", NULL, /* help= */ NULL):
arg_switched_root = true;
break;
case ARG_MACHINE_ID:
r = id128_from_string_nonzero(optarg, &arg_machine_id);
OPTION_LONG("machine-id", "ID", /* help= */ NULL):
r = id128_from_string_nonzero(opts.arg, &arg_machine_id);
if (r < 0)
return log_error_errno(r, "MachineID '%s' is not valid: %m", optarg);
return log_error_errno(r, "MachineID '%s' is not valid: %m", opts.arg);
break;
case 'h':
arg_action = ACTION_HELP;
break;
case 'D':
OPTION_SHORT('D', NULL, /* help= */ NULL):
log_set_max_level(LOG_DEBUG);
break;
case 'b':
case 's':
case 'z':
/* Just to eat away the sysvinit kernel cmdline args that we'll parse in
* parse_proc_cmdline_item() or ignore, without any getopt() error messages.
*/
case '?':
/* Eat the sysvinit kernel cmdline args that we'll parse in
* parse_proc_cmdline_item() or ignore. */
OPTION_SHORT('b', NULL, /* help= */ NULL): {}
OPTION_SHORT('s', NULL, /* help= */ NULL): {}
OPTION_SHORT('z', "ARG", /* help= */ NULL):
if (getpid_cached() != 1)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Switch -%c is only supported when running as PID 1.", opts.opt->short_code);
/* In PID1, do nothing and continue with option parsing. */
break;
OPTION_ERROR:
if (getpid_cached() != 1)
return -EINVAL;
else
return 0;
default:
assert_not_reached();
/* In PID1, silently terminate option parsing. */
return 0;
}
if (optind < argc && getpid_cached() != 1)
if (option_parser_get_n_args(&opts) > 0 && getpid_cached() != 1)
/* Hmm, when we aren't run as init system let's complain about excess arguments */
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Excess arguments.");
@@ -1248,50 +1237,24 @@ static int parse_argv(int argc, char *argv[]) {
}
static int help(void) {
_cleanup_free_ char *link = NULL;
_cleanup_(table_unrefp) Table *options = NULL;
int r;
r = terminal_urlify_man("systemd", "1", &link);
r = option_parser_get_help_table(&options);
if (r < 0)
return log_oom();
return r;
printf("%s [OPTIONS...]\n\n"
"%sStarts and monitors system and user services.%s\n\n"
"This program takes no positional arguments.\n\n"
"%sOptions%s:\n"
" -h --help Show this help\n"
" --version Show version\n"
" --test Determine initial transaction, dump it and exit\n"
" --system Combined with --test: operate in system mode\n"
" --user Combined with --test: operate in user mode\n"
" --dump-configuration-items Dump understood unit configuration items\n"
" --dump-bus-properties Dump exposed bus properties\n"
" --bus-introspect=PATH Write XML introspection data\n"
" --unit=UNIT Set default unit\n"
" --dump-core[=BOOL] Dump core on crash\n"
" --crash-vt=NR Change to specified VT on crash\n"
" --crash-action=ACTION Specify what to do on crash\n"
" --crash-shell[=BOOL] Run shell on crash\n"
" --confirm-spawn[=BOOL] Ask for confirmation when spawning processes\n"
" --show-status[=BOOL] Show status updates on the console during boot\n"
" --log-target=TARGET Set log target (console, journal, kmsg,\n"
" journal-or-kmsg, null)\n"
" --log-level=LEVEL Set log level (debug, info, notice, warning,\n"
" err, crit, alert, emerg)\n"
" --log-color[=BOOL] Highlight important log messages\n"
" --log-location[=BOOL] Include code location in log messages\n"
" --log-time[=BOOL] Prefix log messages with current time\n"
" --default-standard-output= Set default standard output for services\n"
" --default-standard-error= Set default standard error output for services\n"
" --no-pager Do not pipe output into a pager\n"
"\nSee the %s for details.\n",
program_invocation_short_name,
ansi_highlight(),
ansi_normal(),
ansi_underline(),
ansi_normal(),
link);
help_cmdline("[OPTIONS...]");
help_abstract("Starts and monitors system and user services.");
printf("\nThis program takes no positional arguments.\n");
help_section("Options");
r = table_print_or_warn(options);
if (r < 0)
return r;
help_man_page_reference("systemd", "1");
return 0;
}
@@ -2228,8 +2191,8 @@ static int do_reexecute(
}
/* Try the fallback, if there is any, without any serialization. We pass the original argv[] and
* envp[]. (Well, modulo the ordering changes due to getopt() in argv[], and some cleanups in envp[],
* but let's hope that doesn't matter.) */
* envp[]. (Well, modulo the ordering changes due to option parsing in argv[], and some cleanups in
* envp[], but let's hope that doesn't matter.) */
arg_serialization = safe_fclose(arg_serialization);
fds = fdset_free(fds);
@@ -3341,15 +3304,19 @@ int main(int argc, char *argv[]) {
/* The efivarfs is now mounted, let's lock down the system token. */
lock_down_efi_variables();
} else {
/* Running as user instance */
arg_runtime_scope = RUNTIME_SCOPE_USER;
log_set_always_reopen_console(true);
log_set_target_and_open(LOG_TARGET_AUTO);
/* clear the kernel timestamp, because we are not PID 1 */
kernel_timestamp = DUAL_TIMESTAMP_NULL;
if (invoked_by_systemd()) {
log_set_always_reopen_console(true);
log_set_target_and_open(LOG_TARGET_AUTO);
}
r = mac_init();
if (r < 0) {
error_message = "Failed to initialize MAC support";
@@ -3361,9 +3328,11 @@ int main(int argc, char *argv[]) {
* transitioning from the initrd to the main systemd or suchlike. */
save_rlimits(&saved_rlimit_nofile, &saved_rlimit_memlock);
/* Reset all signal handlers. */
/* Reset all signal handlers to clean up after reexec. */
(void) reset_all_signal_handlers();
(void) ignore_signals(SIGNALS_IGNORE);
if (getpid_cached() == 1 || invoked_by_systemd())
(void) ignore_signals(SIGNALS_IGNORE);
(void) parse_configuration(&saved_rlimit_nofile, &saved_rlimit_memlock);