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01/04: services: agetty: Add agetty instance to base services. Make its
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From: |
Danny Milosavljevic |
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Subject: |
01/04: services: agetty: Add agetty instance to base services. Make its tty optional. |
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Date: |
Thu, 15 Feb 2018 06:06:00 -0500 (EST) |
dannym pushed a commit to branch master
in repository guix.
commit 5a9902c8acd63916c6c80cf3c61be6ee814b7e3d
Author: Danny Milosavljevic <address@hidden>
Date: Fri Feb 9 17:07:25 2018 +0100
services: agetty: Add agetty instance to base services. Make its tty
optional.
* gnu/services/base.scm (%base-services): Instantiate agetty-service.
(default-serial-port): New variable.
(agetty-shepherd-service): Make tty optional, default to the above.
* doc/guix.texi (agetty-configuration): Update "tty" documentation.
* gnu/system/install.scm (agetty-default-service): Delete variable.
(embedded-installation-os): Remove agetty-default-service instance.
Add "console" kernel-argument.
---
doc/guix.texi | 15 +++++++++-
gnu/services/base.scm | 76 ++++++++++++++++++++++++++++++++++++++++----------
gnu/system/install.scm | 15 +++-------
3 files changed, 79 insertions(+), 27 deletions(-)
diff --git a/doc/guix.texi b/doc/guix.texi
index 9dafe60..8a9e1bc 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -9724,7 +9724,20 @@ man page for more information.
@item @code{tty}
The name of the console this agetty runs on, as a string---e.g.,
address@hidden"ttyS0"}. This argument is mandatory.
address@hidden"ttyS0"}. This argument is optional, it will default to
+a reasonable default serial port used by the kernel Linux.
+
+For this, if there is a value for an option @code{agetty.tty} in the kernel
+command line, agetty will extract the device name of the serial port
+from it and use that.
+
+If not and if there is a value for an option @code{console} with a tty in
+the Linux command line, agetty will extract the device name of the
+serial port from it and use that.
+
+In both cases, agetty will leave the other serial device settings
+(baud rate etc.) alone---in the hope that Linux pinned them to the
+correct values.
@item @code{baud-rate} (default: @code{#f})
A string containing a comma-separated list of one or more baud rates, in
diff --git a/gnu/services/base.scm b/gnu/services/base.scm
index 8e30bcd..e1c6346 100644
--- a/gnu/services/base.scm
+++ b/gnu/services/base.scm
@@ -817,7 +817,7 @@ the message of the day, among other things."
agetty-configuration?
(agetty agetty-configuration-agetty ;<package>
(default util-linux))
- (tty agetty-configuration-tty) ;string
+ (tty agetty-configuration-tty) ;string | #f
(term agetty-term ;string | #f
(default #f))
(baud-rate agetty-baud-rate ;string | #f
@@ -890,6 +890,40 @@ the message of the day, among other things."
;;; (default #f))
)
+(define (default-serial-port)
+ "Return a gexp that determines a reasonable default serial port
+to use as the tty. This is primarily useful for headless systems."
+ #~(begin
+ ;; console=device,options
+ ;; device: can be tty0, ttyS0, lp0, ttyUSB0 (serial).
+ ;; options: BBBBPNF. P n|o|e, N number of bits,
+ ;; F flow control (r RTS)
+ (let* ((not-comma (char-set-complement (char-set #\,)))
+ (command (linux-command-line))
+ (agetty-specs (find-long-options "agetty.tty" command))
+ (console-specs (filter (lambda (spec)
+ (and (string-prefix? "tty" spec)
+ (not (or
+ (string-prefix? "tty0" spec)
+ (string-prefix? "tty1" spec)
+ (string-prefix? "tty2" spec)
+ (string-prefix? "tty3" spec)
+ (string-prefix? "tty4" spec)
+ (string-prefix? "tty5" spec)
+ (string-prefix? "tty6" spec)
+ (string-prefix? "tty7" spec)
+ (string-prefix? "tty8" spec)
+ (string-prefix? "tty9"
spec)))))
+ (find-long-options "console" command)))
+ (specs (append agetty-specs console-specs)))
+ (match specs
+ (() #f)
+ ((spec _ ...)
+ ;; Extract device name from first spec.
+ (match (string-tokenize spec not-comma)
+ ((device-name _ ...)
+ device-name)))))))
+
(define agetty-shepherd-service
(match-lambda
(($ <agetty-configuration> agetty tty term baud-rate auto-login
@@ -900,8 +934,9 @@ the message of the day, among other things."
erase-characters kill-characters chdir delay nice extra-options)
(list
(shepherd-service
+ (modules '((ice-9 match) (gnu build linux-boot)))
(documentation "Run agetty on a tty.")
- (provision (list (symbol-append 'term- (string->symbol tty))))
+ (provision (list (symbol-append 'term- (string->symbol (or tty
"auto")))))
;; Since the login prompt shows the host name, wait for the
'host-name'
;; service to be done. Also wait for udev essentially so that the tty
@@ -946,6 +981,9 @@ the message of the day, among other things."
('always "--local-line=always")
('never "-local-line=never")))
#~())
+ #$@(if tty
+ #~()
+ #~("--keep-baud"))
#$@(if extract-baud?
#~("--extract-baud")
#~())
@@ -1009,7 +1047,7 @@ the message of the day, among other things."
#$@(if login-pause?
#~("--login-pause")
#~())
- #$tty
+ #$(or tty (default-serial-port))
#$@(if baud-rate
#~(#$baud-rate)
#~())
@@ -1058,18 +1096,21 @@ the tty to run, among other things."
;; text is not lost in the middle of kernel messages (XXX).
(requirement '(user-processes host-name udev))
- (start #~(make-forkexec-constructor
- (list #$(file-append mingetty "/sbin/mingetty")
- "--noclear" #$tty
- #$@(if auto-login
- #~("--autologin" #$auto-login)
- #~())
- #$@(if login-program
- #~("--loginprog" #$login-program)
- #~())
- #$@(if login-pause?
- #~("--loginpause")
- #~()))))
+ (start #~(let ((tty #$(default-serial-port)))
+ (if tty
+ (make-forkexec-constructor
+ (list #$(file-append mingetty "/sbin/mingetty")
+ "--noclear" #$tty
+ #$@(if auto-login
+ #~("--autologin" #$auto-login)
+ #~())
+ #$@(if login-program
+ #~("--loginprog" #$login-program)
+ #~())
+ #$@(if login-pause?
+ #~("--loginpause")
+ #~())))
+ (const #f)))) ; never start.
(stop #~(make-kill-destructor)))))))
(define mingetty-service-type
@@ -2012,6 +2053,11 @@ This service is not part of @var{%base-services}."
(cons tty %default-console-font))
'("tty1" "tty2" "tty3" "tty4" "tty5" "tty6")))
+ (agetty-service (agetty-configuration
+ (extra-options '("-L")) ; no carrier detect
+ (term "vt100")
+ (tty #f))) ; automatic
+
(mingetty-service (mingetty-configuration
(tty "tty1")))
(mingetty-service (mingetty-configuration
diff --git a/gnu/system/install.scm b/gnu/system/install.scm
index e4b2e82..b61660b 100644
--- a/gnu/system/install.scm
+++ b/gnu/system/install.scm
@@ -381,14 +381,6 @@ You have been warned. Thanks for being so brave.\x1b[0m
nvi ;:wq!
%base-packages))))
-(define* (agetty-default-service #:optional (tty "ttyS0"))
- "Return an agetty-service on the given TTY"
- (agetty-service (agetty-configuration
- (extra-options '("-L"))
- (baud-rate "115200")
- (term "vt100")
- (tty tty))))
-
(define* (embedded-installation-os bootloader bootloader-target tty
#:key (extra-modules '()))
"Return an installation os for embedded systems.
@@ -401,12 +393,13 @@ The bootloader BOOTLOADER is installed to
BOOTLOADER-TARGET."
(bootloader bootloader)
(target bootloader-target)))
(kernel linux-libre)
+ (kernel-arguments
+ (cons (string-append "console=" tty)
+ (operating-system-user-kernel-arguments installation-os)))
(initrd (lambda (fs . rest)
(apply base-initrd fs
#:extra-modules extra-modules
- rest)))
- (services (cons* (agetty-default-service tty)
- (operating-system-user-services installation-os)))))
+ rest)))))
(define beaglebone-black-installation-os
(embedded-installation-os u-boot-beaglebone-black-bootloader