run: add a new "-t" mode for invoking a binary on an allocated TTY

src/core/dbus-execute.c

@@ -31,11 +31,12 @@
 #include "strv.h"
 #include "fileio.h"
 #include "execute.h"
-#include "dbus-execute.h"
 #include "capability.h"
 #include "env-util.h"
 #include "af-list.h"
 #include "namespace.h"
+#include "path-util.h"
+#include "dbus-execute.h"
 
 #ifdef HAVE_SECCOMP
 #include "seccomp-util.h"
@@ -845,6 +846,92 @@ int bus_exec_context_set_transient_property(
 
                 return 1;
 
+        } else if (streq(name, "TTYPath")) {
+                const char *tty;
+
+                r = sd_bus_message_read(message, "s", &tty);
+                if (r < 0)
+                        return r;
+
+                if (!path_is_absolute(tty))
+                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "TTY device not absolute path");
+
+                if (mode != UNIT_CHECK) {
+                        char *t;
+
+                        t = strdup(tty);
+                        if (!t)
+                                return -ENOMEM;
+
+                        free(c->tty_path);
+                        c->tty_path = t;
+
+                        unit_write_drop_in_private_format(u, mode, name, "TTYPath=%s\n", tty);
+                }
+
+                return 1;
+
+        } else if (streq(name, "StandardInput")) {
+                const char *s;
+                ExecInput p;
+
+                r = sd_bus_message_read(message, "s", &s);
+                if (r < 0)
+                        return r;
+
+                p = exec_input_from_string(s);
+                if (p < 0)
+                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid standard input name");
+
+                if (mode != UNIT_CHECK) {
+                        c->std_input = p;
+
+                        unit_write_drop_in_private_format(u, mode, name, "StandardInput=%s\n", exec_input_to_string(p));
+                }
+
+                return 1;
+
+
+        } else if (streq(name, "StandardOutput")) {
+                const char *s;
+                ExecOutput p;
+
+                r = sd_bus_message_read(message, "s", &s);
+                if (r < 0)
+                        return r;
+
+                p = exec_output_from_string(s);
+                if (p < 0)
+                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid standard output name");
+
+                if (mode != UNIT_CHECK) {
+                        c->std_output = p;
+
+                        unit_write_drop_in_private_format(u, mode, name, "StandardOutput=%s\n", exec_output_to_string(p));
+                }
+
+                return 1;
+
+        } else if (streq(name, "StandardError")) {
+                const char *s;
+                ExecOutput p;
+
+                r = sd_bus_message_read(message, "s", &s);
+                if (r < 0)
+                        return r;
+
+                p = exec_output_from_string(s);
+                if (p < 0)
+                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid standard error name");
+
+                if (mode != UNIT_CHECK) {
+                        c->std_error = p;
+
+                        unit_write_drop_in_private_format(u, mode, name, "StandardError=%s\n", exec_output_to_string(p));
+                }
+
+                return 1;
+
         } else if (streq(name, "Environment")) {
 
                 _cleanup_strv_free_ char **l = NULL;