116 lines
3.3 KiB
Bash
116 lines
3.3 KiB
Bash
#!/bin/sh
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# The builtin grub.cfg generator. This script is called by
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# ostree/src/libostree/ostree-bootloader-grub2.c whenever boot loader
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# configuration file needs to be updated on systems which do not use
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# grub2-mkconfig (and thus, the `ostree admin instutil grub2-generate` path).
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#
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# It can be used as a template for a custom grub.cfg generator. What to consider
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# when writing a custom grub.cfg generator:
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#
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# - The populate_menu() function converts boot loader entries as defined by
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# https://www.freedesktop.org/wiki/Specifications/BootLoaderSpec/ into GRUB2
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# menuentry sections. This is the core logic that is required by OSTree
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# based system.
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#
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# - Embedded systems: Be aware that this script is executed not only on a host machine by OS
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# installer, but also on a target device, thus think about shell portability. A target device
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# for example might be using busybox with a limited shell.
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#
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# Feel free to edit this script to fit your requirements.
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set -e
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script=$(basename ${0})
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# Atomically safe location where to generete grub.cfg when executing system upgrade.
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new_grub2_cfg=${2}
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entries_path=$(dirname $new_grub2_cfg)/entries
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read_config()
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{
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config_file=${1}
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title=""
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initrd=""
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options=""
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linux=""
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devicetree=""
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while read -r line
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do
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record=$(echo ${line} | cut -f 1 -d ' ')
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value=$(echo ${line} | cut -s -f2- -d ' ')
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case "${record}" in
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"title")
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title=${value}
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;;
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"initrd")
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initrd=${value}
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;;
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"linux")
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linux=${value}
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;;
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"devicetree")
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devicetree=${value}
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;;
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"options")
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options=${value}
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;;
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esac
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done < ${config_file}
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if [ -z "${title}" ]; then
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title="(Untitled)"
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fi
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}
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populate_menu()
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{
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# Default to /boot if OSTREE_BOOT_PARTITION is not set and /boot is on the same device than ostree/repo
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if [ -z ${OSTREE_BOOT_PARTITION+x} ] && [ -d /boot/ostree ] && [ -d /ostree/repo ] && [ $(stat -c '%d' /boot/ostree) -eq $(stat -c '%d' /ostree/repo) ]; then
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boot_prefix="/boot"
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else
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boot_prefix="${OSTREE_BOOT_PARTITION}"
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fi
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for config in $(ls -v -r $entries_path/*.conf); do
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read_config ${config}
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menu="${menu}menuentry '${title}' {\n"
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menu="${menu}\t linux ${boot_prefix}${linux} ${options}\n"
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if [ -n "${initrd}" ] ; then
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menu="${menu}\t initrd ${boot_prefix}${initrd}\n"
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fi
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if [ -n "${devicetree}" ] ; then
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menu="${menu}\t devicetree ${boot_prefix}${devicetree}\n"
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fi
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menu="${menu}}\n\n"
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done
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# The printf command seems to be more reliable across shells for special character (\n, \t) evaluation
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printf "$menu" >> ${new_grub2_cfg}
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}
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populate_warning()
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{
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cat >> ${new_grub2_cfg} <<EOF
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# This file was generated by ${script}. Do not modify the generated file - all changes will
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# be lost the next time file is regenerated. For more details refer to the ${script} script.
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EOF
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}
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populate_header()
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{
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cat >> ${new_grub2_cfg} <<EOF
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serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1
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default=boot
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timeout=10
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EOF
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}
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generate_grub2_cfg()
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{
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populate_warning
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populate_header
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populate_menu
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}
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generate_grub2_cfg
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