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|
#!/bin/sh
# This script is called by ostree/src/libostree/ostree-bootloader-grub2.c whenever
# boot loader configuration file needs to be updated. It can be used as a template
# for a custom grub.cfg generator. When writing a custom grub.cfg generator:
#
# 1) cp ostree-grub-generator ostree-grub-generator-mydevice
# 2) Edit ostree-grub-generator-mydevice
# 3) Pass ostree-grub-generator-mydevice to qt-ostree via --grub2-cfg-generator
# 4) Examine the generated grub.cfg file in the OTA sysroot (created by --create-ota-sysroot)
#
# WARNINGS:
#
# - Do not modify populate_menu() function, unless you know what you are doing. This function
# converts boot loader entries (https://www.freedesktop.org/wiki/Specifications/BootLoaderSpec/)
# into GRUB2 menuentry sections.
#
# - Be aware that this script is executed not only on a host machine, but also on a
# target device, thus think about shell portability. Target device for example might
# be using busybox with a limited shell.
set -e
script=$(basename ${0})
# Atomically safe location where to generete grub.cfg when executing OTA update.
new_grub2_cfg=${2}
entries_path=$(dirname $new_grub2_cfg)/entries
read_config()
{
config_file=${entries_path}/${1}
title=""
initrd=""
options=""
linux=""
while read -r line
do
record=$(echo ${line} | cut -f 1 -d ' ')
value=$(echo ${line} | cut -s -f2- -d ' ')
case "${record}" in
"title")
title=${value}
;;
"initrd")
initrd=${value}
;;
"linux")
linux=${value}
;;
"options")
options=${value}
;;
esac
done < ${config_file}
if [ -z "${title}" ]; then
title="(Untitled)"
fi
}
populate_menu()
{
# We need to prepend "boot/" prefix when boot/ directory is on the same
# partition as usr/ - this is the layout we have on Intel NUC boards, the
# only board with GRUB boot loader that we support at the moment. When there
# will be more boards, determine boot_prefix at runtime.
boot_prefix="/boot"
for config in $(ls ${entries_path}); do
read_config ${config}
menu="${menu}menuentry '${title}' {\n"
menu="${menu}\t linux ${boot_prefix}/${linux} ${options}\n"
menu="${menu}\t initrd ${boot_prefix}/${initrd}\n"
menu="${menu}}\n\n"
done
# printf seems to be more reliable across shells for special character (\n, \t) evaluation
printf "$menu" >> ${new_grub2_cfg}
}
populate_warning()
{
cat >> ${new_grub2_cfg} <<EOF
# This file was generated by ${script}. Do not modify the generated file - all
# changes will be lost when this file will be regenerated by OSTree. For more
# details refer to ${script} script.
EOF
}
populate_header()
{
cat >> ${new_grub2_cfg} <<EOF
serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1
default=boot
timeout=10
EOF
}
generate_grub2_cfg()
{
populate_warning
populate_header
populate_menu
}
generate_grub2_cfg
|
