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-rw-r--r--gnu/build/file-systems.scm30
1 files changed, 29 insertions, 1 deletions
diff --git a/gnu/build/file-systems.scm b/gnu/build/file-systems.scm
index d95340df83..d5f38c6774 100644
--- a/gnu/build/file-systems.scm
+++ b/gnu/build/file-systems.scm
@@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2014, 2015, 2016, 2017, 2018, 2020, 2021 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2014-2018, 2020-2022 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2016, 2017 David Craven <david@craven.ch>
;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2019 Guillaume Le Vaillant <glv@posteo.net>
@@ -54,6 +54,7 @@
bind-mount
+ system*/tty
mount-flags->bit-mask
check-file-system
mount-file-system
@@ -67,6 +68,33 @@
;;;
;;; Code:
+(define (system*/console program . args)
+ "Run PROGRAM with ARGS in a tty on top of /dev/console. The return value is
+as for 'system*'."
+ (match (primitive-fork)
+ (0
+ (dynamic-wind
+ (const #t)
+ (lambda ()
+ (login-tty (open-fdes "/dev/console" O_RDWR))
+ (apply execlp program program args))
+ (lambda ()
+ (primitive-_exit 127))))
+ (pid
+ (cdr (waitpid pid)))))
+
+(define (system*/tty program . args)
+ "Run PROGRAM with ARGS, creating a tty if its standard input isn't one.
+The return value is as for 'system*'.
+
+This is necessary for commands such as 'cryptsetup open' or 'fsck' that may
+need to interact with the user but might be invoked from shepherd, where
+standard input is /dev/null."
+ (apply (if (isatty? (current-input-port))
+ system*
+ system*/console)
+ program args))
+
(define (bind-mount source target)
"Bind-mount SOURCE at TARGET."
(mount source target "" MS_BIND))