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https://github.com/systemd/systemd-stable.git
synced 2024-12-24 21:34:08 +03:00
main: parse our own command line and the kernel command line
This commit is contained in:
Lennart Poettering
parent
34f0e866d3
commit
f170852aea
221
main.c
221
main.c
@ -27,29 +27,226 @@
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <getopt.h>
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#include "manager.h"
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#include "log.h"
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#include "mount-setup.h"
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static enum {
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ACTION_RUN,
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ACTION_HELP
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} action = ACTION_RUN;
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static char *default_unit = NULL;
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static int set_default_unit(const char *u) {
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char *c;
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assert(u);
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if (!(c = strdup(u)))
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return -ENOMEM;
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free(default_unit);
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default_unit = c;
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return 0;
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}
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static int parse_proc_cmdline_word(const char *word) {
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static const char * const rlmap[] = {
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"single", SPECIAL_RUNLEVEL1_TARGET,
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"-s", SPECIAL_RUNLEVEL1_TARGET,
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"s", SPECIAL_RUNLEVEL1_TARGET,
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"S", SPECIAL_RUNLEVEL1_TARGET,
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"1", SPECIAL_RUNLEVEL1_TARGET,
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"2", SPECIAL_RUNLEVEL2_TARGET,
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"3", SPECIAL_RUNLEVEL3_TARGET,
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"4", SPECIAL_RUNLEVEL4_TARGET,
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"5", SPECIAL_RUNLEVEL5_TARGET
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};
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if (startswith(word, "systemd.default="))
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return set_default_unit(word + 15);
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else if (startswith(word, "systemd.log_target=")) {
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if (log_set_target_from_string(word + 19) < 0)
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log_warning("Failed to parse log target %s. Ignoring.", word + 19);
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} else if (startswith(word, "systemd.log_level=")) {
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if (log_set_max_level_from_string(word + 18) < 0)
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log_warning("Failed to parse log level %s. Ignoring.", word + 18);
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} else {
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unsigned i;
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/* SysV compatibility */
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for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
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if (streq(word, rlmap[i]))
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return set_default_unit(rlmap[i+1]);
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}
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return 0;
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}
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static int parse_proc_cmdline(void) {
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char *line;
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int r;
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char *w;
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size_t l;
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char *state;
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if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
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log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno));
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return 0;
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}
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FOREACH_WORD_QUOTED(w, l, line, state) {
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char *word;
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if (!(word = strndup(w, l))) {
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r = -ENOMEM;
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goto finish;
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}
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r = parse_proc_cmdline_word(word);
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free(word);
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if (r < 0)
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goto finish;
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}
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r = 0;
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finish:
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free(line);
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return r;
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_LOG_LEVEL = 0x100,
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ARG_LOG_TARGET,
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ARG_DEFAULT
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};
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static const struct option options[] = {
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{ "log-level", required_argument, NULL, ARG_LOG_LEVEL },
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{ "log-target", required_argument, NULL, ARG_LOG_TARGET },
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{ "default", required_argument, NULL, ARG_DEFAULT },
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{ "help", no_argument, NULL, 'h' },
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{ NULL, 0, NULL, 0 }
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};
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int c, r;
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assert(argc >= 1);
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assert(argv);
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while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
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switch (c) {
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case ARG_LOG_LEVEL:
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if ((r = log_set_max_level_from_string(optarg)) < 0) {
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log_error("Failed to parse log level %s.", optarg);
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return r;
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}
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break;
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case ARG_LOG_TARGET:
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if ((r = log_set_target_from_string(optarg)) < 0) {
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log_error("Failed to parse log target %s.", optarg);
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return r;
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}
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break;
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case ARG_DEFAULT:
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if ((r = set_default_unit(optarg)) < 0) {
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log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
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return r;
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}
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break;
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case 'h':
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action = ACTION_HELP;
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break;
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case '?':
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return -EINVAL;
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default:
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log_error("Unknown option code %c", c);
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return -EINVAL;
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}
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if (optind < argc) {
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log_error("Too many arguments.");
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return -EINVAL;
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}
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return 0;
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}
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static int help(void) {
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printf("%s [options]\n\n"
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" -h --help Show this help\n"
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" --default=UNIT Set default unit\n"
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" --log-level=LEVEL Set log level\n"
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" --log-target=TARGET Set log target (console, syslog, kmsg)\n",
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__progname);
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return 0;
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}
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int main(int argc, char *argv[]) {
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Manager *m = NULL;
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Unit *target = NULL;
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Job *job = NULL;
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int r, retval = 1;
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const char *default_unit;
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if (argc >= 2)
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default_unit = argv[1];
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else
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default_unit = SPECIAL_DEFAULT_TARGET;
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if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
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goto finish;
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/* Move out of the way, so that we won't block unmounts */
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assert_se(chdir("/") == 0);
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/* Mount /proc, /sys and friends, so that /proc/cmdline and
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* /proc/$PID/fd is available. */
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mount_setup();
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/* Reset all signal handlers. */
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assert_se(reset_all_signal_handlers() == 0);
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/* Close all open files */
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assert_se(close_all_fds(NULL, 0) == 0);
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if (parse_proc_cmdline() < 0)
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goto finish;
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log_parse_environment();
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if (parse_argv(argc, argv) < 0)
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goto finish;
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if (action == ACTION_HELP) {
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retval = help();
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goto finish;
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}
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assert_se(action == ACTION_RUN);
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/* Move out of the way, so that we won't block unmounts */
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assert_se(chdir("/") == 0);
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/* Become a session leader if we aren't one yet. */
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setsid();
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@ -59,12 +256,6 @@ int main(int argc, char *argv[]) {
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/* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
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dbus_connection_set_change_sigpipe(FALSE);
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/* Mount /dev, /sys and friends */
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mount_setup();
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/* Set up logging */
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log_set_target(LOG_TARGET_CONSOLE);
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/* Open the logging devices, if possible and necessary*/
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log_open_syslog();
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log_open_kmsg();
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@ -104,11 +295,13 @@ int main(int argc, char *argv[]) {
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retval = 0;
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log_debug("Exit.");
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finish:
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if (m)
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manager_free(m);
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log_debug("Exit.");
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free(default_unit);
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dbus_shutdown();
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