run: pass the pty slave fd to transient service

The rationale is similar to 40e1f4ea7458a0a80eaf1ef356e52bfe0835412e.

Currently, we only pass TTYPath=/dev/pts/... to
the transient service spawned by systemd-run.
This is a bit problematic though, when ExecStartPre=
or ExecStopPost= is used. Since when these control
processes get to run, the main process is not yet
started/has already exited, hence the slave suffers
from the same vhangup problem as the mentioned commit.

By passing the slave fd in, the service manager will
hold the fd open as long as the service is alive.

Fixes #32916

diff --git a/src/run/run.c b/src/run/run.c
index dfb0c84144e4766054251bdba81ad491c3b426fc..fa77c5ea78eec7339fa07771edfffe8b5d9a82b8 100644 (file)
--- a/src/run/run.c
+++ b/src/run/run.c
@@ -1133,11 +1133,17 @@ static int transient_service_set_properties(sd_bus_message *m, const char *pty_p
         }
 
         if (pty_path) {
+                _cleanup_close_ int pty_slave = -EBADF;
+
+                pty_slave = open_terminal(pty_path, O_RDWR|O_NOCTTY|O_CLOEXEC);
+                if (pty_slave < 0)
+                        return pty_slave;
+
                 r = sd_bus_message_append(m,
                                           "(sv)(sv)(sv)(sv)",
-                                          "StandardInput", "s", "tty",
-                                          "StandardOutput", "s", "tty",
-                                          "StandardError", "s", "tty",
+                                          "StandardInputFileDescriptor", "h", pty_slave,
+                                          "StandardOutputFileDescriptor", "h", pty_slave,
+                                          "StandardErrorFileDescriptor", "h", pty_slave,
                                           "TTYPath", "s", pty_path);
                 if (r < 0)
                         return bus_log_create_error(r);