[Buildroot] [PATCH 1/1] package/systemd: fix "Timed out waiting for device /dev/console."

[Yann E. MORIN <yann.morin.1998@free.fr>]

Xavier, All,

On 2019-03-03 12:30 +0100, Xavier Ruppen spake thusly:
> Buildroot built with systemd fails to open a login prompt on the
> serial port when /dev/console is specified as BR2_TARGET_GENERIC_GETTY_PORT
> (which is its default value):
> 
> systemd[1]: dev-console.device: Job dev-console.device/start timed out.
> systemd[1]: Timed out waiting for device /dev/console.
> systemd[1]: Dependency failed for Serial Getty on console.
> systemd[1]: serial-getty at console.service: Job serial-getty at console.service/start failed with result 'dependency'.
> systemd[1]: dev-console.device: Job dev-console.device/start failed with result 'timeout'.
> systemd[1]: Reached target Login Prompts.
> systemd[1]: Reached target Multi-User System.
> 
> According to this issue on Github [1], serial-getty at .service should
> not be instantiated on /dev/console, console-getty at .service should
> be used instead. This stems from the fact that there should be no
> dependency on /dev/console.
> 
> [1] https://github.com/systemd/systemd/issues/10914
> 
> Signed-off-by: Xavier Ruppen <xruppen@gmail.com>
> ---
>  package/systemd/systemd.mk | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/package/systemd/systemd.mk b/package/systemd/systemd.mk
> index 7a46a50ed3..f378203e8d 100644
> --- a/package/systemd/systemd.mk
> +++ b/package/systemd/systemd.mk
> @@ -397,11 +397,15 @@ endef
>  
>  ifneq ($(call qstrip,$(BR2_TARGET_GENERIC_GETTY_PORT)),)
>  # systemd needs getty.service for VTs and serial-getty.service for serial ttys
> +# note that console-getty.service should be used on /dev/console as it should not have dependencies
>  # also patch the file to use the correct baud-rate, the default baudrate is 115200 so look for that
>  define SYSTEMD_INSTALL_SERVICE_TTY
>  	if echo $(BR2_TARGET_GENERIC_GETTY_PORT) | egrep -q 'tty[0-9]*$$'; \
>  	then \
>  		SERVICE="getty"; \
> +	elif echo $(BR2_TARGET_GENERIC_GETTY_PORT) | egrep -q 'console'; \
> +	then \
> +		SERVICE="console-getty"; \

Actually, I think we should check for 'console' first, and since this is
a literal, we do not need grep, just a test for equality:

    if [ $(BR2_TARGET_GENERIC_GETTY_PORT) = /dev/console ]; \
    then \
        SERVICE="console-getty"; \
    elif echo $(BR2_TARGET_GENERIC_GETTY_PORT) | egrep -q 'tty[0-9]*$$'; \
    then \
        [...]
    fi

Otherwise, I'm OK with this change.

Regards,
Yann E. MORIN.

>  	else \
>  		SERVICE="serial-getty"; \
>  	fi; \
> -- 
> 2.21.0
> 

-- 
.-----------------.--------------------.------------------.--------------------.
|  Yann E. MORIN  | Real-Time Embedded | /"\ ASCII RIBBON | Erics' conspiracy: |
| +33 662 376 056 | Software  Designer | \ / CAMPAIGN     |  ___               |
| +33 561 099 427 `------------.-------:  X  AGAINST      |  \e/  There is no  |
| http://ymorin.is-a-geek.org/ | _/*\_ | / \ HTML MAIL    |   v   conspiracy.  |
'------------------------------^-------^------------------^--------------------'