mirror of
https://github.com/Antynea/grub-btrfs.git
synced 2026-08-23 16:56:17 +08:00
309 lines
9.8 KiB
Bash
309 lines
9.8 KiB
Bash
#! /usr/bin/env bash
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#
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#
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#################################################################################################################################################
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# Written by: Antynea #
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# #
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# Purpose: Include btrfs snapshots at boot options (grub-menu). #
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# #
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# What this script does: #
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# - Automatically List snapshots existing on root partition (btrfs). #
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# - Automatically Detect if "/boot" is in separate partition. #
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# - Automatically Detect kernel, initramfs and intel microcode in "/boot" directory on snapshots. (For custon name, see below.) #
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# - Automatically Create corresponding "menuentry" in grub.cfg , which ensures a very easy rollback. #
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# #
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# How to use it: #
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# - Add this lines to /etc/default/grub: #
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# #
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# * GRUB_BTRFS_SUBMENUNAME="ArchLinux Snapshots" #
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# (Name menu appearing in grub.) #
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# * GRUB_BTRFS_PREFIXENTRY="Snapshot:" #
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# (Add a name ahead your snapshots entries.) #
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# * GRUB_BTRFS_DISPLAY_PATH_SNAPSHOT="true" #
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# (Show full path snapshot or only name) #
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# * GRUB_BTRFS_TITLE_FORMAT="p/d/n" #
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# (Custom title, shows/hides p"prefix" d"date" n"name" in grub-menu, separator "/", custom order available) #
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# * GRUB_BTRFS_NKERNEL=("vmlinuz-linux") #
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# (Use only if you have custom kernel name or auto-detect failed.) #
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# * GRUB_BTRFS_NINIT=("initramfs-linux.img" "initramfs-linux-fallback.img") #
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# (Use only if you have custom initramfs name or auto-detect failed.) #
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# * GRUB_BTRFS_INTEL_UCODE=("intel-ucode.img") #
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# (Use only if you have custom intel-ucode or auto-detect failed.) #
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# #
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# - Generate grub.cfg (on Archlinux use grub-mkconfig -o /boot/grub/grub.cfg) #
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# #
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# - grub-btrfs automatically generates snapshots entries. #
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# - You will see it appear different entries (e.g : Snapshot: [2014-02-12 11:24:37] my snapshot name overkill) #
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# #
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# #
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# To do: #
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# # #
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# * Display name of microcode in menuentry when available #
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# #
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#################################################################################################################################################
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set -e
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#prefix="/usr"
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#exec_prefix="${prefix}"
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datarootdir="/usr/share"
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#datadir="${datarootdir}"
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sysconfdir="/etc"
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. "${datarootdir}/grub/grub-mkconfig_lib"
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. "${sysconfdir}/default/grub"
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######################################
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### Variables in /etc/default/grub ###
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######################################
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## Choice of method
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choise_of_method=${GRUB_BTRFS_METHOD:-"1"}
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## Submenu name
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submenuname=${GRUB_BTRFS_SUBMENUNAME:-"ArchLinux Snapshots"}
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## Prefix entry
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prefixentry=${GRUB_BTRFS_PREFIXENTRY:-"Snapshot:"}
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## Show full path snapshot or only name
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path_snapshot=${GRUB_BTRFS_DISPLAY_PATH_SNAPSHOT:-"true"}
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## Title format
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title_format=${GRUB_BTRFS_TITLE_FORMAT:-"p/d/n"}
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## Kernel(s) name(s)
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nkernel=("${GRUB_BTRFS_NKERNEL[@]}")
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## Initramfs name(s)
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ninit=("${GRUB_BTRFS_NINIT[@]}")
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## Microcode(s) name(s)
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microcode=("${GRUB_BTRFS_INTEL_UCODE[@]}")
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## Limit to show in menu
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limit=("${GRUB_BTRFS_LIMIT[@]:-100}")
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## How to sort
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subvolsort=${GRUB_BTRFS_SUBVOLUME_SORT:-"descending"}
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case "${subvolsort}" in
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ascending) btrfssubvolsort=("--sort=+rootid");;
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*) btrfssubvolsort=("--sort=-rootid")
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esac
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########################
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### variables script ###
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########################
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## Internationalization (default : english)
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export TEXTDOMAIN=grub-btrfs-git
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export TEXTDOMAINDIR="/usr/share/locale"
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## hints string
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hs_boot=$(${grub_probe} --target="hints_string" "/boot" 2>/dev/null)
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## UUID of the boot partition
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boot_uuid=$(${grub_probe} --target="fs_uuid" "/boot" 2>/dev/null)
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## Type filesystem of boot partition
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boot_fs=$(${grub_probe} --target="fs" "/boot" 2>/dev/null)
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## UUID of the root partition
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root_uuid=$(${grub_probe} "/" --target="fs_uuid" 2>/dev/null)
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## Parameters passed to the kernel
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kernel_parameters="$GRUB_CMDLINE_LINUX $GRUB_CMDLINE_LINUX_DEFAULT"
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## Mount point location
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gbgmp="/tmp/gbgmp"
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## Class for theme
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CLASS="--class snapshots --class gnu-linux --class gnu --class os"
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## save IFS
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oldIFS=$IFS
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## boot_dir (auto-detect if /boot is separate partition or not)
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boot_dir()
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{
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boot_dir="$gbgmp/$snap_dir_name/boot"
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[[ "$root_uuid" != "$boot_uuid" ]] && boot_dir="/boot"
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echo "$boot_dir"
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}
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##############
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### Script ###
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##############
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### BEGIN auto detect ###
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## menu entries
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snapshots_entry()
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{
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## \" required for snap,kernels,init,microcode with space in their name
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echo " submenu '"${title_menu[*]}"' {
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submenu '---> "${title_menu[*]}" <---' { echo }
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"
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for k in "${name_kernel[@]}"; do
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for i in "${name_initramfs[@]}"; do
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for u in "${name_microcode[@]}"; do
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echo "\
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menuentry '"${k}" & "${i}"' ${CLASS} "\$menuentry_id_option" 'gnulinux-snapshots-$boot_uuid'{
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$(save_default_entry)
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if [ x\$feature_all_video_module = xy ]; then
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insmod all_video
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fi
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set gfxpayload=keep
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insmod ${boot_fs}
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if [ x\$feature_platform_search_hint = xy ]; then
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search --no-floppy --fs-uuid --set=root ${hs_boot} ${boot_uuid}
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else
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search --no-floppy --fs-uuid --set=root ${boot_uuid}
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fi
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echo 'Loading Snapshot: "${snap_date_time}" "${snap_dir_name}"'
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echo 'Loading Kernel: "${k}" ...'
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linux \"${boot_dir_real_path}/"${k}"\" root=UUID=${root_uuid} rw rootflags=subvol=\""${snap_dir_name}"\" ${kernel_parameters}\
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"
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if [ -f "$(boot_dir)"/"${u}" ] ; then
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echo "\
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echo 'Loading Microcode & Initramfs: "${u}" "${i}" ...'
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initrd \"${boot_dir_real_path}/"${u}"\" \"${boot_dir_real_path}/"${i}"\""
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else
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echo "\
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echo 'Loading Initramfs: "${i}" ...'
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initrd \"${boot_dir_real_path}/"${i}"\""
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fi
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echo " }"
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done
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done
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done
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echo " }"
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}
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## List of snapshots on filesystem
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snapshot_list()
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{
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for snap in $(btrfs subvolume list -sa "${btrfssubvolsort}" /); do
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IFS=$oldIFS
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snap=($snap)
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local snap_path_name=${snap[@]:13:${#snap[@]}}
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# Discard deleted snapshots
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if [ "$snap_path_name" = "DELETED" ]; then continue; fi
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[[ ${snap_path_name%%"/"*} == "<FS_TREE>" ]] && snap_path_name=${snap_path_name#*"/"}
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echo ${snap[@]:10:2} ${snap_path_name}
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done
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}
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## Detect kernels in "/boot"
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detect_kernel()
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{
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## Arch original kernel (auto-detect)
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for akernel in "$(boot_dir)"/vmlinuz-* ; do
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list_kernel+=("$akernel")
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done
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## Custom name kernel in GRUB_BTRFS_NKERNEL
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if [ ! -z "${nkernel}" ] ; then
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for ckernel in "${nkernel[@]}" ; do
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[[ ! -f /"$(boot_dir)"/"${ckernel}" ]] && continue;
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list_kernel+=("$ckernel")
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done
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fi
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}
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## Detect initramfs in "/boot"
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detect_initramfs()
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{
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## Arch original initramfs (auto-detect)
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for ainitramfs in "$(boot_dir)"/initramfs-* ; do
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list_initramfs+=("$ainitramfs")
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done
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## Custom name initramfs in GRUB_BTRFS_NINIT
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if [ ! -z "$ninit" ] ; then
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for cinitramfs in "${ninit[@]}" ; do
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[[ ! -f /"$(boot_dir)"/"${cinitramfs}" ]] && continue;
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list_initramfs+=("$cinitramfs")
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done
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fi
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}
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## Detect microcode in "/boot"
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detect_microcode()
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{
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## Arch original intel microcode
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for aucode in "$(boot_dir)"/intel-ucode.img ; do
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list_ucode+=("$aucode")
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done
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## Custom name microcode in GRUB_BTRFS_INTEL_UCODE
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if [ ! -z "$microcode" ] ; then
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for cucode in "${microcode[@]}" ; do
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[[ ! -f /"$(boot_dir)"/"${cucode}" ]] && continue
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list_ucode+=("$cucode")
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done
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fi
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}
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## Show full path snapshot or only name
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path_snapshot()
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{
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case "${path_snapshot}" in
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true) name_snapshot=("${snap_dir_name}");;
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*) name_snapshot=("${snap_dir_name#*"/"}")
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esac
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}
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## Title format in grub-menu
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title_format()
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{
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case "${title_format}" in
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p/d/n) title_menu=("${prefixentry}" "${snap_date_time}" "${name_snapshot}");;
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p/n/d) title_menu=("${prefixentry}" "${snap_dir_name}" "${snap_date_time}");;
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p/d) title_menu=("${prefixentry}" "${snap_date_time}");;
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p/n) title_menu=("${prefixentry}" "${snap_dir_name}");;
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d/n) title_menu=("${snap_date_time}" "${snap_dir_name}");;
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n/d) title_menu=("${snap_dir_name}" "${snap_date_time}");;
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p) title_menu=("${prefixentry}");;
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d) title_menu=("${snap_date_time}");;
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n) title_menu=("${snap_dir_name}");;
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*) gettext_printf $"# Warning: GRUB_BTRFS_TITLE_FORMAT=${title_format}, syntax error \n" >&2
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esac
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}
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## List of kernels, initramfs and microcode in snapshots
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list_kernels_initramfs()
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{
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IFS=$'\n'
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c=0
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for item in $(snapshot_list); do
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IFS=$oldIFS
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item=($item)
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snap_dir_name=${item[@]:2:${#item[@]}}
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[[ ! -d "$gbgmp/$snap_dir_name/boot" ]] && continue;
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snap_date_time=${item[@]:0:2}
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gettext_printf $"# Found Snapshot: %s\n" "${snap_date_time} ${snap_dir_name}" >&2 ;
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unset list_kernel
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detect_kernel
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name_kernel=("${list_kernel[@]##*"/"}")
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# echo "kernel = ${name_kernel[*]}"
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unset list_initramfs
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detect_initramfs
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name_initramfs=("${list_initramfs[@]##*"/"}")
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# echo "initramfs = ${name_initramfs[*]}"
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unset list_ucode
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detect_microcode
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name_microcode=("${list_ucode[@]##*"/"}")
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# echo "ucode = ${name_microcode[*]}"
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boot_dir_real_path="$(make_system_path_relative_to_its_root "$(boot_dir)")"
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## Create menu entries
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# name snpashot
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path_snapshot
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# title menu custom
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title_format
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# echo "${title_menu[*]}"
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snapshots_entry
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c=$((1+$c))
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if [[ $c -gt $limit ]]; then
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break;
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fi
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done
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IFS=$oldIFS
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}
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### END auto detect ###
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### Choice of method ###
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if [ ${choise_of_method} = "1" ] ; then
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gettext_printf "###### - Grub-btrfs: Auto-detect - ######\n" >&2 ;
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[[ ! -d $gbgmp ]] && mkdir -p $gbgmp
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mount -o subvolid=0 /dev/disk/by-uuid/$root_uuid $gbgmp/
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echo "submenu '${submenuname}' {"
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list_kernels_initramfs ;
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echo "}"
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umount $gbgmp
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gettext_printf "###### - Grub-btrfs: Auto-detect - ######\n" >&2 ;
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fi
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### End choice of method ###
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