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systemctl: document telinit/init matching a bit (#8339)

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See: #8305
This commit is contained in:
Lennart Poettering 2018-03-02 12:51:57 +01:00 committed by Zbigniew Jędrzejewski-Szmek
parent ae934a7325
commit c54819ca80
1 changed files with 19 additions and 4 deletions
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23
src/systemctl/systemctl.c
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@ -8268,28 +8268,43 @@ static int parse_argv(int argc, char *argv[]) {
if (strstr(program_invocation_short_name, "halt")) {
arg_action = ACTION_HALT;
return halt_parse_argv(argc, argv);
} else if (strstr(program_invocation_short_name, "poweroff")) {
arg_action = ACTION_POWEROFF;
return halt_parse_argv(argc, argv);
} else if (strstr(program_invocation_short_name, "reboot")) {
if (kexec_loaded())
arg_action = ACTION_KEXEC;
else
arg_action = ACTION_REBOOT;
return halt_parse_argv(argc, argv);
} else if (strstr(program_invocation_short_name, "shutdown")) {
arg_action = ACTION_POWEROFF;
return shutdown_parse_argv(argc, argv);
} else if (strstr(program_invocation_short_name, "init")) {
/* Matches invocations as "init" as well as "telinit", which are synonymous when run as PID !=
* 1 on SysV.
*
* On SysV "telinit" was the official command to communicate with PID 1, but "init" would
* redirect itself to "telinit" if called with PID != 1. We follow the same logic here still,
* though we add one level of indirection, as we implement "telinit" in "systemctl". Hence, for
* us if you invoke "init" you get "systemd", but it will execve() "systemctl" immediately with
* argv[] unmodified if PID is != 1. If you invoke "telinit" you directly get "systemctl". In
* both cases we shall do the same thing, which is why we do strstr(p_i_s_n, "init") here, as a
* quick way to match both.
*
* Also see redirect_telinit() in src/core/main.c. */
if (sd_booted() > 0) {
arg_action = _ACTION_INVALID;
return telinit_parse_argv(argc, argv);
} else {
/* Hmm, so some other init system is
* running, we need to forward this
* request to it. For now we simply
* guess that it is Upstart. */
/* Hmm, so some other init system is running, we need to forward this request to
* it. For now we simply guess that it is Upstart. */
execv(TELINIT, argv);