mirror of
https://github.com/Antynea/grub-btrfs.git
synced 2026-03-04 13:05:00 +08:00
224 lines
7.4 KiB
Bash
224 lines
7.4 KiB
Bash
#! /usr/bin/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. #
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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 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" (Name menu appearing in grub.) #
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# * GRUB_BTRFS_PREFIXENTRY="Snapshot:" (Add a name ahead your snapshots entries.) #
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# * GRUB_BTRFS_NKERNEL=("vmlinuz-linux") (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") (Use only if you have custom initramfs name or auto-detect failed.) #
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# * GRUB_BTRFS_INTEL_UCODE=("intel-ucode.img") (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: my snapshot name overkill [2014-02-12 11:24:37]) #
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# #
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# Warning: #
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# #
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# Script in progress #
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# to do : #
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# # #
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# * verify compatibility with manjaro and snapper (but I don't use them, so it will take some time) #
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# #
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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=${GRUB_BTRFS_SUBMENUNAME:-"1"}
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## Submenu name
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submenuname=${GRUB_BTRFS_SUBMENUNAME:-"ArchLinux Snapshots"}
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## Prefix entry
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prefixentry=${GRUB_BTRFS_PREFIXENTRY:-"Snapshot:"}
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## Kernel(s) name(s)
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nkernel=("${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[@]:-intel-ucode.img}")
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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 "$boot_dir"
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}
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##############
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### Script ###
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##############
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### BEGIN auto detect ###
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## menu entries
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snapshots_entry()
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{
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## \" required for snap,kernels,init,microcode with space in their name
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echo " submenu '${1} ${2} ${3}' {"
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for k in "${name_kernel[@]}"; do
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for i in "${name_initramfs[@]}"; do
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echo "\
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menuentry '${2} with "${k}" & "${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 ${boot_uuid}
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fi
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echo 'Loading Snapshot: "${2}" "${3}"'
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echo 'Loading Kernel: "${k}" ...'
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linux \"${boot_dir_real_path}/"${k}"\" root=UUID=${root_uuid} rw rootflags=subvol=\""${snap_dir_name}"\" ${kernel_parameters}
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echo 'Loading Initramfs: "${i}" ...'"
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if [ -f "$(boot_dir)/${microcode}" ] ; then
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echo "\
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initrd \"${boot_dir_real_path}/"${microcode}"\" initrd \"/"${snap_dir_name}"/boot/"${i}"\""
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else
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echo "\
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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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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 $(btrfs subvolume list -sa /); do
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IFS=$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} ${snap_path_name}
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done
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}
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detect_kernel()
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{
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## Arch original kernel (auto-detect)
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for akernel in "$(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()
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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+=("$cinitramfs")
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done
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fi
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}
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## List of kernels and initramfs in snapshots
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list_kernels_initramfs()
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{
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IFS=$'\n'
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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_dir_name $snap_date_time" >&2 ;
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unset list_kernel
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detect_kernel
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name_kernel=("${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 = ${name_initramfs[*]}"
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boot_dir_real_path="$(make_system_path_relative_to_its_root "$(boot_dir)")"
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# Create menu entries
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snapshots_entry "${prefixentry}" "${snap_dir_name}" "${snap_date_time}"
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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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