run: reject waiting for remain-after-exit services

Reproducer:
  unit=run-wait-rae-$(date +%s)
  sudo timeout 3s systemd-run --wait --remain-after-exit \
      --unit="$unit" /bin/true
  echo $?
  systemctl is-active "$unit.service"

Before, the command timed out with exit status 124 while the service
stayed active. --wait waits for deactivation, but RemainAfterExit=yes
keeps the service active after the command exits.

Follow-up for 2a453c2ee3

man/systemd-run.xml

@@ -216,7 +216,9 @@
         <listitem><para>After the service process has terminated, keep the service around until it is explicitly
         stopped. This is useful to collect runtime information about the service after it finished running. Also see
         <varname>RemainAfterExit=</varname> in
-        <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
+        <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>. This
+        option may not be combined with <option>--wait</option>, <option>--scope</option>, <option>--pty</option>,
+        <option>--pty-late</option>, or <option>--pipe</option>.
         </para>
 
         <xi:include href="version-info.xml" xpointer="v207"/>
@@ -529,8 +531,9 @@
         completed). On exit, terse information about the unit's runtime is shown, including total runtime (as well as
         CPU, memory, IO, and IP accounting data, if the corresponding cgroup accounting settings are enabled)
         and the exit code and status of the main process. This output may be suppressed with <option>--quiet</option>.
-        This option may not be combined with <option>--no-block</option>, <option>--scope</option> or the various
-        path, socket, or timer options.</para>
+        This option may not be combined with <option>--no-block</option>,
+        <option>--remain-after-exit</option>, <option>--scope</option> or the various path, socket, or timer
+        options.</para>
 
         <xi:include href="version-info.xml" xpointer="v232"/></listitem>
       </varlistentry>

src/run/run.c

@@ -717,6 +717,10 @@ static int parse_argv(int argc, char *argv[]) {
                 if (arg_no_block)
                         return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
                                                "--pty/--pty-late/--pipe is not compatible with --no-block.");
+
+                if (arg_remain_after_exit)
+                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                               "--pty/--pty-late/--pipe is not compatible with --remain-after-exit.");
         }
 
         if (arg_stdio == ARG_STDIO_PTY && arg_pty_late && streq_ptr(arg_service_type, "oneshot"))
@@ -761,6 +765,10 @@ static int parse_argv(int argc, char *argv[]) {
                 if (arg_scope)
                         return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
                                                "--wait may not be combined with --scope.");
+
+                if (arg_remain_after_exit)
+                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                               "--wait may not be combined with --remain-after-exit.");
         }
 
         if (arg_scope && arg_root_directory)

test/units/TEST-74-AUX-UTILS.run.sh

@@ -72,6 +72,8 @@ systemctl cat "$UNIT"
 grep -q "^Type=oneshot" "/run/systemd/transient/$UNIT.service"
 systemctl stop "$UNIT"
 (! systemctl cat "$UNIT")
+(! systemd-run --wait --remain-after-exit true)
+(! systemd-run --pipe --remain-after-exit true)
 
 : "Transient service (user daemon)"
 systemd-run --wait --pipe --user --machine=testuser@ \