From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Wed, 22 Jul 2020 14:03:42 +0200 Subject: [PATCH] Add systemd integration scripts to make "systemctl reboot --boot-loader-menu=xxx" work with grub This commit adds a number of scripts / config files to make "systemctl reboot --boot-loader-menu=xxx" work with grub: 1. /lib/systemd/system/systemd-logind.service.d/10-grub.conf This sets SYSTEMD_REBOOT_TO_BOOT_LOADER_MENU in the env. for logind, indicating that the boot-loader which is used supports this feature, see: https://github.com/systemd/systemd/blob/master/docs/ENVIRONMENT.md 2. /lib/systemd/system/grub-systemd-integration.service /lib/systemd/system/reboot.target.wants/grub-systemd-integration.service -> ../grub-systemd-integration.service /usr/libexec/grub/grub-systemd-integration.sh The symlink in the .wants dir causes the added service file to be started by systemd just before rebooting the system. If /run/systemd/reboot-to-boot-loader-menu exist then the service will run the grub-systemd-integration.sh script. This script sets the new menu_show_once_timeout grubenv variable to the requested timeout in seconds. 3. /etc/grub.d/14_menu_show_once This new grub-mkconfig snippet adds the necessary code to the generated grub.conf to honor the new menu_show_once_timeout variable, and to automatically clear it after consuming it. Note the service and libexec script use grub-systemd-integration as name because in the future they may be used to add further integration with systemctl reboot --foo options, e.g. support for --boot-loader-entry=NAME. A few notes about upstreaming this patch from the rhboot grub2 fork: 1. I have deliberately put the grub.conf bits for this in a new / separate grub-mkconfig snippet generator for easy upstreaming 2. Even though the commit message mentions the .wants symlink for the .service I have been unable to come up with a clean way to do this at "make install" time, this should be fixed before upstreaming. Downstream notes: 1. Since make install does not add the .wants symlink, this needs to be done in grub2.spec %install 2. This is keeping support for the "old" Fedora specific menu_show_once env variable, which has a hardcoded timeout of 60 sec in 12_menu_auto_hide in place for now. This can be dropped (eventually) in a follow-up patch once GNOME has been converted to use the systemd dbus API equivalent of "systemctl reboot --boot-loader-menu=xxx". Signed-off-by: Hans de Goede --- Makefile.util.def | 27 ++++++++++++++++++++++++ conf/Makefile.common | 6 ++++++ util/grub.d/14_menu_show_once.in | 13 ++++++++++++ util/systemd/10-grub-logind-service.conf.in | 2 ++ util/systemd/grub-systemd-integration.service.in | 8 +++++++ util/systemd/systemd-integration.sh.in | 6 ++++++ 6 files changed, 62 insertions(+) create mode 100755 util/grub.d/14_menu_show_once.in create mode 100644 util/systemd/10-grub-logind-service.conf.in create mode 100644 util/systemd/grub-systemd-integration.service.in create mode 100644 util/systemd/systemd-integration.sh.in diff --git a/Makefile.util.def b/Makefile.util.def index 2e6ad979c..9927c2cfd 100644 --- a/Makefile.util.def +++ b/Makefile.util.def @@ -470,6 +470,12 @@ script = { installdir = grubconf; }; +script = { + name = '14_menu_show_once'; + common = util/grub.d/14_menu_show_once.in; + installdir = grubconf; +}; + script = { name = '01_users'; common = util/grub.d/01_users.in; @@ -569,6 +575,27 @@ script = { installdir = grubconf; }; +script = { + name = 'grub-systemd-integration.service'; + common = util/systemd/grub-systemd-integration.service.in; + installdir = systemdunit; + condition = COND_HOST_LINUX; +}; + +script = { + name = 'systemd-integration.sh'; + common = util/systemd/systemd-integration.sh.in; + installdir = grublibexec; + condition = COND_HOST_LINUX; +}; + +script = { + name = '10-grub-logind-service.conf'; + common = util/systemd/10-grub-logind-service.conf.in; + installdir = systemd_logind_service_d; + condition = COND_HOST_LINUX; +}; + program = { mansection = 1; name = grub-mkrescue; diff --git a/conf/Makefile.common b/conf/Makefile.common index 0647c53b9..9fe5863b2 100644 --- a/conf/Makefile.common +++ b/conf/Makefile.common @@ -63,8 +63,11 @@ CCASFLAGS_LIBRARY = $(UTILS_CCASFLAGS) # Other variables grubconfdir = $(sysconfdir)/grub.d +grublibexecdir = $(libexecdir)/$(grubdirname) platformdir = $(pkglibdir)/$(target_cpu)-$(platform) starfielddir = $(pkgdatadir)/themes/starfield +systemdunitdir = ${prefix}/lib/systemd/system +systemd_logind_service_ddir = $(systemdunitdir)/systemd-logind.service.d CFLAGS_GNULIB = -Wno-undef -Wno-unused -Wno-unused-parameter -Wno-redundant-decls -Wno-unreachable-code -Werror=trampolines -fno-trampolines CPPFLAGS_GNULIB = -I$(top_builddir)/grub-core/lib/gnulib -I$(top_srcdir)/grub-core/lib/gnulib @@ -121,6 +124,9 @@ noinst_LIBRARIES = dist_noinst_DATA = platform_SCRIPTS = platform_PROGRAMS = +grublibexec_SCRIPTS = +systemdunit_SCRIPTS = +systemd_logind_service_d_SCRIPTS = TESTS = EXTRA_DIST = diff --git a/util/grub.d/14_menu_show_once.in b/util/grub.d/14_menu_show_once.in new file mode 100755 index 000000000..1cd7f3614 --- /dev/null +++ b/util/grub.d/14_menu_show_once.in @@ -0,0 +1,13 @@ +#! /bin/sh +# Force the menu to be shown once, with a timeout of ${menu_show_once_timeout} +# if requested by ${menu_show_once_timeout} being set in the env. +cat << EOF +if [ x\$feature_timeout_style = xy ]; then + if [ "\${menu_show_once_timeout}" ]; then + set timeout_style=menu + set timeout="\${menu_show_once_timeout}" + unset menu_show_once_timeout + save_env menu_show_once_timeout + fi +fi +EOF diff --git a/util/systemd/10-grub-logind-service.conf.in b/util/systemd/10-grub-logind-service.conf.in new file mode 100644 index 000000000..f2d4ac007 --- /dev/null +++ b/util/systemd/10-grub-logind-service.conf.in @@ -0,0 +1,2 @@ +[Service] +Environment=SYSTEMD_REBOOT_TO_BOOT_LOADER_MENU=true diff --git a/util/systemd/grub-systemd-integration.service.in b/util/systemd/grub-systemd-integration.service.in new file mode 100644 index 000000000..c81fb594c --- /dev/null +++ b/util/systemd/grub-systemd-integration.service.in @@ -0,0 +1,8 @@ +[Unit] +Description=Grub2 systemctl reboot --boot-loader-menu=... support +Before=umount.target systemd-reboot.service +DefaultDependencies=no +ConditionPathExists=/run/systemd/reboot-to-boot-loader-menu + +[Service] +ExecStart=@libexecdir@/@grubdirname@/systemd-integration.sh diff --git a/util/systemd/systemd-integration.sh.in b/util/systemd/systemd-integration.sh.in new file mode 100644 index 000000000..dc1218597 --- /dev/null +++ b/util/systemd/systemd-integration.sh.in @@ -0,0 +1,6 @@ +#!/bin/sh + +TIMEOUT_USEC=$(cat /run/systemd/reboot-to-boot-loader-menu) +TIMEOUT=$(((TIMEOUT_USEC + 500000) / 1000000)) + +@grub_editenv@ - set menu_show_once_timeout=$TIMEOUT