main: explain our /etc empty check a bit in a comment

[elogind.git] / src / core / main.c

diff --git a/src/core/main.c b/src/core/main.c
index b3ee1b9b889960589c7730cccb8687a88e1609d6..a732c6945afc5a671d134e235cafd31e03241771 100644 (file)
--- a/src/core/main.c
+++ b/src/core/main.c
@@ -375,43 +375,6 @@ static int parse_proc_cmdline_item(const char *key, const char *value) {
                 } else
                         log_warning("Environment variable name '%s' is not valid. Ignoring.", value);
 
-        } else if (!streq(key, "systemd.restore_state") &&
-                   !streq(key, "systemd.gpt_auto") &&
-                   (startswith(key, "systemd.") || startswith(key, "rd.systemd."))) {
-
-                const char *c;
-
-                /* Ignore systemd.journald.xyz and friends */
-                c = key;
-                if (startswith(c, "rd."))
-                        c += 3;
-                if (startswith(c, "systemd."))
-                        c += 8;
-                if (c[strcspn(c, ".=")] != '.')  {
-
-                        log_warning("Unknown kernel switch %s. Ignoring.", key);
-
-                        log_info("Supported kernel switches:\n"
-                                 "systemd.unit=UNIT                        Default unit to start\n"
-                                 "rd.systemd.unit=UNIT                     Default unit to start when run in initrd\n"
-                                 "systemd.dump_core=0|1                    Dump core on crash\n"
-                                 "systemd.crash_shell=0|1                  Run shell on crash\n"
-                                 "systemd.crash_chvt=N                     Change to VT #N on crash\n"
-                                 "systemd.confirm_spawn=0|1                Confirm every process spawn\n"
-                                 "systemd.show_status=0|1|auto             Show status updates on the console during bootup\n"
-                                 "systemd.log_target=console|kmsg|journal|journal-or-kmsg|syslog|syslog-or-kmsg|null\n"
-                                 "                                         Log target\n"
-                                 "systemd.log_level=LEVEL                  Log level\n"
-                                 "systemd.log_color=0|1                    Highlight important log messages\n"
-                                 "systemd.log_location=0|1                 Include code location in log messages\n"
-                                 "systemd.default_standard_output=null|tty|syslog|syslog+console|kmsg|kmsg+console|journal|journal+console\n"
-                                 "                                         Set default log output for services\n"
-                                 "systemd.default_standard_error=null|tty|syslog|syslog+console|kmsg|kmsg+console|journal|journal+console\n"
-                                 "                                         Set default log error output for services\n"
-                                 "systemd.setenv=ASSIGNMENT                Set an environment variable for all spawned processes\n"
-                                 "systemd.restore_state=0|1                Restore backlight/rfkill state at boot\n");
-                }
-
         } else if (streq(key, "quiet") && !value) {
 
                 log_set_max_level(LOG_NOTICE);
@@ -1580,13 +1543,22 @@ int main(int argc, char *argv[]) {
                 if (in_initrd())
                         log_info("Running in initial RAM disk.");
 
-                empty_etc = dir_is_empty("/etc") > 0;
+                /* Let's check whether /etc is already populated. We
+                 * don't actually really check for that, but use
+                 * /etc/machine-id as flag file. This allows container
+                 * managers and installers to provision a couple of
+                 * files already. If the container manager wants to
+                 * provision the machine ID itself it should pass
+                 * $container_uuid to PID 1.*/
+
+                empty_etc = access("/etc/machine-id", F_OK) < 0;
                 if (empty_etc)
                         log_info("Running with unpopulated /etc.");
         } else {
-                _cleanup_free_ char *t = uid_to_name(getuid());
-                log_debug(PACKAGE_STRING " running in user mode for user "PID_FMT"/%s. (" SYSTEMD_FEATURES ")",
-                          getuid(), t);
+                _cleanup_free_ char *t;
+
+                t = uid_to_name(getuid());
+                log_debug(PACKAGE_STRING " running in user mode for user "UID_FMT"/%s. (" SYSTEMD_FEATURES ")", getuid(), strna(t));
         }
 
         if (arg_running_as == SYSTEMD_SYSTEM && !skip_setup) {
@@ -1861,7 +1833,7 @@ finish:
         if (reexecute) {
                 const char **args;
                 unsigned i, args_size;
-                sigset_t ss, o_ss;
+                sigset_t ss;
 
                 /* Close and disarm the watchdog, so that the new
                  * instance can reinitialize it, but doesn't get
@@ -1947,8 +1919,10 @@ finish:
 
                 /* reenable any blocked signals, especially important
                  * if we switch from initial ramdisk to init=... */
-                sigemptyset(&ss);
-                sigprocmask(SIG_SETMASK, &ss, &o_ss);
+                reset_all_signal_handlers();
+
+                assert_se(sigemptyset(&ss) == 0);
+                assert_se(sigprocmask(SIG_SETMASK, &ss, NULL) == 0);
 
                 if (switch_root_init) {
                         args[0] = switch_root_init;
@@ -1968,8 +1942,6 @@ finish:
                         log_error("Failed to execute /bin/sh, giving up: %m");
                 } else
                         log_warning("Failed to execute /sbin/init, giving up: %m");
-
-                sigprocmask(SIG_SETMASK, &o_ss, NULL);
         }
 
         if (arg_serialization) {