systemctl: move telinit execcing out of parse_argv()

With this change, parse_argv() does parsing, without any real actions.
Fully untested ;)

src/systemctl/systemctl-compat-telinit.c

@@ -1,9 +1,11 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
 #include <getopt.h>
+#include <unistd.h>
 
 #include "alloc-util.h"
 #include "pretty-print.h"
+#include "rlimit-util.h"
 #include "systemctl-compat-telinit.h"
 #include "systemctl-daemon-reload.h"
 #include "systemctl-start-unit.h"
@@ -150,3 +152,11 @@ int reload_with_fallback(void) {
 
         return 0;
 }
+
+int exec_telinit(char *argv[]) {
+        (void) rlimit_nofile_safe();
+        execv(TELINIT, argv);
+
+        return log_error_errno(SYNTHETIC_ERRNO(EIO),
+                               "Couldn't find an alternative telinit implementation to spawn.");
+}

src/systemctl/systemctl-compat-telinit.h

@@ -4,3 +4,4 @@
 int telinit_parse_argv(int argc, char *argv[]);
 int start_with_fallback(void);
 int reload_with_fallback(void);
+int exec_telinit(char *argv[]);

src/systemctl/systemctl.c

@@ -973,11 +973,8 @@ static int parse_argv(int argc, char *argv[]) {
                                 /* Hmm, so some other init system is running, we need to forward this request
                                  * to it. */
 
-                                (void) rlimit_nofile_safe();
+                                arg_action = ACTION_TELINIT;
-                                execv(TELINIT, argv);
+                                return 1;
-
-                                return log_error_errno(SYNTHETIC_ERRNO(EIO),
-                                                       "Couldn't find an alternative telinit implementation to spawn.");
                         }
 
                 } else if (strstr(program_invocation_short_name, "runlevel")) {
@@ -1143,6 +1140,10 @@ static int run(int argc, char *argv[]) {
                 r = runlevel_main();
                 break;
 
+        case ACTION_TELINIT:
+                r = exec_telinit(argv);
+                break;
+
         case ACTION_EXIT:
         case ACTION_SUSPEND:
         case ACTION_HIBERNATE:

src/systemctl/systemctl.h

@@ -29,6 +29,7 @@ enum action {
         ACTION_RELOAD,
         ACTION_REEXEC,
         ACTION_RUNLEVEL,
+        ACTION_TELINIT,
         ACTION_CANCEL_SHUTDOWN,
         _ACTION_MAX,
         _ACTION_INVALID = -1