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package/systemd: fix tty handling

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Handling of tty is a bit tricky, we need to aggressively disable what
systemd does with tty1 then update for what buildroot wants to do

Rework the whole tty generation to work with presets

Signed-off-by: Jérémy Rosen <jeremy.rosen@smile.fr>
[yann.morin.1998@free.fr:
  - fold long lines
  - drop spurious empty lines removals
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
This commit is contained in:
Jérémy Rosen 2019-12-16 11:30:42 +01:00 committed by Yann E. MORIN
parent 231ad359bc
commit 6c3944a057
2 changed files with 24 additions and 10 deletions
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5
package/systemd/80-buildroot.preset
View file

@ -1,5 +1,2 @@
# Higher priority than systemd presets
# by default systemd enables a getty on tty1
# we don't want that because tty1 may not exist
disable getty@.service
# This file is currently empty, but is available for demonstration and future use

29
package/systemd/systemd.mk
View file

@ -436,22 +436,39 @@ 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
#
# systemd defaults to only have getty@tty.service enabled
# * DefaultInstance=tty1 in getty@service
# * no DefaultInstance in serial-getty@.service
# * WantedBy=getty.target in console-getty.service
# * console-getty is not enabled because of 90-systemd.preset
# We want "systemctl preset-all" to do the right thing, even when run on the target after boot
# * remove the default instance of getty@.service via a drop-in in /usr/lib
# * set a new DefaultInstance for getty@.service instead, if needed
# * set a new DefaultInstance for serial-getty@.service, if needed
# * override the systemd-provided preset for console-getty.service if needed
define SYSTEMD_INSTALL_SERVICE_TTY
mkdir $(TARGET_DIR)/usr/lib/systemd/system/getty@.service.d; \
printf '[Install]\nDefaultInstance=\n' \
>$(TARGET_DIR)/usr/lib/systemd/system/getty@.service.d/buildroot-console.conf; \
if [ $(BR2_TARGET_GENERIC_GETTY_PORT) = "console" ]; \
then \
TARGET="console-getty.service"; \
LINK_NAME="console-getty.service"; \
printf 'enable console-getty.service\n' \
>$(TARGET_DIR)/usr/lib/systemd/system-preset/81-buildroot-tty.preset; \
elif echo $(BR2_TARGET_GENERIC_GETTY_PORT) | egrep -q 'tty[0-9]*$$'; \
then \
TARGET="getty@.service"; \
LINK_NAME="getty@$(call qstrip,$(BR2_TARGET_GENERIC_GETTY_PORT)).service"; \
printf '[Install]\nDefaultInstance=%s\n' \
$(call qstrip,$(BR2_TARGET_GENERIC_GETTY_PORT)) \
>$(TARGET_DIR)/usr/lib/systemd/system/getty@.service.d/buildroot-console.conf; \
else \
TARGET="serial-getty@.service"; \
LINK_NAME="serial-getty@$(call qstrip,$(BR2_TARGET_GENERIC_GETTY_PORT)).service"; \
mkdir $(TARGET_DIR)/usr/lib/systemd/system/serial-getty@.service.d;\
printf '[Install]\nDefaultInstance=%s\n' \
$(call qstrip,$(BR2_TARGET_GENERIC_GETTY_PORT)) \
>$(TARGET_DIR)/usr/lib/systemd/system/serial-getty@.service.d/buildroot-console.conf;\
fi; \
mkdir -p $(TARGET_DIR)/etc/systemd/system/getty.target.wants/; \
ln -fs ../../../../lib/systemd/system/$${TARGET} \
$(TARGET_DIR)/etc/systemd/system/getty.target.wants/$${LINK_NAME}; \
if [ $(call qstrip,$(BR2_TARGET_GENERIC_GETTY_BAUDRATE)) -gt 0 ] ; \
then \
$(SED) 's,115200,$(BR2_TARGET_GENERIC_GETTY_BAUDRATE),' $(TARGET_DIR)/lib/systemd/system/$${TARGET}; \