/usr/lib/installed-tests/libostree/ostree-grub-generator is in ostree-tests 2018.4-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 | #!/bin/sh
# The builtin grub.cfg generator.
#
# 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. What to consider when writing a custom grub.cfg
# generator:
#
# - The populate_menu() function converts boot loader entries as defined by
# https://www.freedesktop.org/wiki/Specifications/BootLoaderSpec/ into GRUB2
# menuentry sections. This is the core logic that is required by OSTree
# based system.
#
# - Embedded systems: Be aware that this script is executed not only on a host machine by OS
# installer, but also on a target device, thus think about shell portability. A target device
# for example might be using busybox with a limited shell.
#
# Feel free to edit this script to fit your requirements.
set -e
script=$(basename ${0})
# Atomically safe location where to generete grub.cfg when executing system upgrade.
new_grub2_cfg=${2}
entries_path=$(dirname $new_grub2_cfg)/entries
read_config()
{
config_file=${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()
{
# Default to /boot if OSTREE_BOOT_PARTITION is not set and /boot is on the same device than ostree/repo
if [ -z ${OSTREE_BOOT_PARTITION+x} ] && [ -d /boot/ostree ] && [ -d /ostree/repo ] && [ $(stat -c '%d' /boot/ostree) -eq $(stat -c '%d' /ostree/repo) ]; then
boot_prefix="/boot"
else
boot_prefix="${OSTREE_BOOT_PARTITION}"
fi
for config in $(ls $entries_path/*.conf); do
read_config ${config}
menu="${menu}menuentry '${title}' {\n"
menu="${menu}\t linux ${boot_prefix}${linux} ${options}\n"
if [ -n "${initrd}" ] ; then
menu="${menu}\t initrd ${boot_prefix}${initrd}\n"
fi
menu="${menu}}\n\n"
done
# The printf command seems to be more reliable across shells for special character (\n, \t) evaluation
printf "$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 the next time file is regenerated. For more details refer to the ${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
|