main: don't show help text anymore when we detect an unknown kernel cmdline value starting with "systemd."

As generators and other components started to maintain their own kernel
command line options this help text needed more and more exceptions and
wasn't complete anyway. Fixing that would leak more information about
specific generators into PID 1, which we should avoid.

Given that kernel cmdline handling traditionally doesn't generate errors
or show help texts, let's just remove the logic for it for systemd too.

1 files changed, 0 insertions, 37 deletions

diff --git a/src/core/main.c b/src/core/main.c
index b3ee1b9b88..863ba527cc 100644
--- 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);