tty: require stdin to be a terminal only if shell_job is set

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-restore.c

@@ -88,7 +88,7 @@ static int shmem_remap(void *old_addr, void *new_addr, unsigned long size)
 	return 0;
 }
 
-static int crtools_prepare_shared(void)
+static int crtools_prepare_shared(struct cr_options *opts)
 {
 	if (prepare_shared_fdinfo())
 		return -1;
@@ -97,7 +97,7 @@ static int crtools_prepare_shared(void)
 	if (collect_inet_sockets())
 		return -1;
 
-	if (tty_prep_fds())
+	if (tty_prep_fds(opts))
 		return -1;
 
 	return 0;
@@ -1258,7 +1258,7 @@ int cr_restore_tasks(pid_t pid, struct cr_options *opts)
 	if (prepare_pstree() < 0)
 		return -1;
 
-	if (crtools_prepare_shared() < 0)
+	if (crtools_prepare_shared(opts) < 0)
 		return -1;
 
 	return restore_root_task(root_item, opts);

include/tty.h

@@ -21,7 +21,7 @@ extern int tty_setup_slavery(void);
 
 extern int tty_verify_active_pairs(void);
 
-extern int tty_prep_fds(void);
+extern int tty_prep_fds(struct cr_options *opts);
 extern void tty_fini_fds(void);
 
 #endif /* __CR_TTY_H__ */

tty.c

@@ -1193,8 +1193,11 @@ int dump_tty(struct fd_parms *p, int lfd, const int fdinfo)
 	return do_dump_gen_file(p, lfd, &tty_ops, fdinfo);
 }
 
-int tty_prep_fds(void)
+int tty_prep_fds(struct cr_options *opts)
 {
+	if (!opts->shell_job)
+		return 0;
+
 	if (!isatty(STDIN_FILENO)) {
 		pr_err("Standart stream is not a terminal, aborting\n");
 		return -1;