(shepherd-service-type
'virtual-terminal
(lambda (utf8?)
- (shepherd-service
- (documentation "Set virtual terminals in UTF-8 module.")
- (provision '(virtual-terminal))
- (requirement '(root-file-system))
- (start #~(lambda _
- (call-with-output-file
- "/sys/module/vt/parameters/default_utf8"
- (lambda (port)
- (display 1 port)))
- #t))
- (stop #~(const #f))))
+ (let ((knob "/sys/module/vt/parameters/default_utf8"))
+ (shepherd-service
+ (documentation "Set virtual terminals in UTF-8 module.")
+ (provision '(virtual-terminal))
+ (requirement '(root-file-system))
+ (start #~(lambda _
+ ;; In containers /sys is read-only so don't insist on
+ ;; writing to this file.
+ (unless (= 1 (call-with-input-file #$knob read))
+ (call-with-output-file #$knob
+ (lambda (port)
+ (display 1 port))))
+ #t))
+ (stop #~(const #f)))))
#t)) ;default to UTF-8
(define console-keymap-service-type