refactor: ♻️ start rewrite
BREAKING CHANGE: everything
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# snap-pac-uki
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Pacman hooks creating unified kernel images for snapshots created by snap-pac.
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## Limits
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- only works on the "root" snap-pac config
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- puts all UKIs into `/boot/EFI/Linux/`
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- kernel parameters are extracted from a file called `/boot/loader/entries/00-arch.conf`
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- expects that the default subvolume is mounted via kernel command line
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- expects that the default subvolume is called `@`
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[Trigger]
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Operation = Upgrade
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Operation = Install
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Operation = Remove
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Type = Package
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Target = *
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[Action]
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Description = Performing pre UKI creation...
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When = PreTransaction
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Exec = /usr/share/libalpm/scripts/snap-pac-uki_create.fish
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AbortOnFail
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[Trigger]
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Operation = Upgrade
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Operation = Install
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Operation = Remove
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Type = Package
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Target = *
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[Action]
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Description = Performing post UKI creation...
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When = PostTransaction
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Exec = /usr/share/libalpm/scripts/snap-pac-uki_create.fish
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[Trigger]
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Operation = Upgrade
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Operation = Install
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Operation = Remove
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Type = Package
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Target = *
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[Action]
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Description = Performing UKI cleanup...
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When = PostTransaction
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Exec = /usr/share/libalpm/scripts/snap-pac-uki_cleanup.fish
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#!/bin/fish
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cp ./hooks/* /usr/share/libalpm/hooks/
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cp ./scripts/* /usr/share/libalpm/scripts/
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#!/bin/fish
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# get snapshots
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set -l config "root"
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set -l snapshot_ids (snapper -c $config --jsonout ls | jq ".$config | .[] | .number")
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# get current ukis
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set -l ukis (ls /boot/EFI/Linux/ | grep '^snap-pac-uki-[1-9][0-9]*\.efi$' | grep -o "[1-9][0-9]*")
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for x in $ukis
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if not contains $x $snapshot_ids
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set -l path "/boot/EFI/Linux/snap-pac-uki-$x.efi"
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rm $path
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echo "==> removed UKI: $path"
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end
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end
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@ -1,46 +1,103 @@
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#!/bin/fish
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# get id and type of last snapshot
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set -l config "root"
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set -l snapshot (snapper -c $config --jsonout ls | jq -c ".$config | last")
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set -l id (echo $snapshot | jq ".number")
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function error -d "prints an error and terminates the program" -a error
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echo $error
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if not contains (echo $snapshot | jq -r ".type") "pre" "post"
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echo "==> last snapshot type is neither 'pre' nor 'post'; no UKI creation"
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exit
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exit 1
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end
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function checkdeps -d "check for depenencies"
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set -l deps "jq" "snapper"
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# check if UKI already exists
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set -l ukis (ls /boot/EFI/Linux/ | grep '^snap-pac-uki-[1-9][0-9]*\.efi$' | grep -o "[1-9][0-9]*")
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if contains $id $ukis
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echo "==> UKI already exists; no UKI creation"
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exit
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for dep in $deps
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which $dep >/dev/null 2>/dev/null
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if test $status != "0"
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error "didn't find depenecy: $dep"
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end
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end
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end
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function load_config -d "loads the config from a config file" -a cfg
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# set default values
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set -g BUILD_PATH "/tmp/snap-pac-uki"
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set -g EFI_DIR "/efi/EFI/Linux/"
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set -g SNAPPER_CONFIG "root"
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set -g SNAPSHOT_SUBVOL "@snapshots"
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# prepare uki creation
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set -l buildpath "/tmp/snap-pac-uki/$id"
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mkdir -p $buildpath
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rm -rf "$buildpath/*"
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cd $buildpath
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# load file
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set -l cfg (jq -c <$cfg)
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sed "s/BUILD_ID=.*/BUILD_ID=\"Snapshot $id\"/" </usr/lib/os-release >./os-release
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# parse config
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set -l cfgs "build_path" "efi_dir" "kernel_cmd" "fallback_cmd" "snapper_config" "snapshot_subvol"
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for c in $cfgs
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echo $cfg | jq -e ".$c" >/dev/null
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grep options /boot/loader/entries/00-arch.conf | \
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string sub -s 9 | \
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sed ':a;N;$!ba;s/\n/ /g' | \
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sed "s/subvol=@/subvol=@snapshots\\/$id\\/snapshot/" >./kernel-parameters
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switch $status
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case "0"
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set -g (echo $c | sed "s/./\U&/g") (echo $cfg | jq -r ".$c")
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case "4"
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error "failed to parse option: $c"
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end
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end
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# check for mandatory options
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set -l mandatory_cfgs "kernel_cmd" "fallback_cmd"
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for mc in $mandatory_cfgs
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set -gq (echo $mc | sed "s/./\U&/g")
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if test $status != 0
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error "missing config parameter: $mc"
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end
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end
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end
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function get_last_snapshot -d "reads the last snapper snapshot id"
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set -g SNAPSHOT_ID (snapper -c $SNAPPER_CONFIG --jsonout ls | jq ".$SNAPPER_CONFIG | last | .number")
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echo $SNAPSHOT_ID
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end
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function create_uki -d "creates a new uki" -a fallback
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# prepare directory
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set -l bp "$BUILD_PATH/$SNAPSHOT_ID"
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mkdir -p $bp
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rm -rf "$bp/*"
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# os-release
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sed "s/BUILD_ID=.*/BUILD_ID=\"Snapshot $SNAPSHOT_ID\"/" </usr/lib/os-release >"$bp/os-release"
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# kernel cmd
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echo $KERNEL_CMD | sed "s/SNAPSHOT/$SNAPSHOT_SUBVOL\\/$SNAPSHOT_ID\\/snapshot/" >"$bp/kernel-cmd"
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# create uki
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set -l ukipath "/boot/EFI/Linux/snap-pac-uki-$id.efi"
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objcopy \
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--add-section .osrel="./os-release" --change-section-vma .osrel=0x20000 \
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--add-section .cmdline="./kernel-parameters" --change-section-vma .cmdline=0x30000 \
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--add-section .osrel="$bp/os-release" --change-section-vma .osrel=0x20000 \
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--add-section .cmdline="$bp/kernel-cmd" --change-section-vma .cmdline=0x30000 \
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--add-section .splash="/usr/share/systemd/bootctl/splash-arch.bmp" --change-section-vma .splash=0x40000 \
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--add-section .linux="/boot/vmlinuz-linux" --change-section-vma .linux=0x2000000 \
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--add-section .initrd="/boot/initramfs-linux.img" --change-section-vma .initrd=0x3000000 \
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"/usr/lib/systemd/boot/efi/linuxx64.efi.stub" $ukipath
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echo "==> created UKI: $ukipath"
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--add-section .initrd="/boot/initramfs-linux$fallback.img" --change-section-vma .initrd=0x3000000 \
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"/usr/lib/systemd/boot/efi/linuxx64.efi.stub" "$bp/arch-linux-$SNAPSHOT_ID$fallback.efi"
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end
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function copy_current -d "copies new ukis to efi"
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# copy to "current"
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cp "$BUILD_PATH/$SNAPSHOT_ID/arch-linux-$SNAPSHOT_ID.efi" "$EFI_DIR/arch-linux-current.efi"
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cp "$BUILD_PATH/$SNAPSHOT_ID/arch-linux-$SNAPSHOT_ID-fallback.efi" "$EFI_DIR/arch-linux-fallback.efi"
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# copy to "snapshots"
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cp "$BUILD_PATH/$SNAPSHOT_ID/arch-linux-$SNAPSHOT_ID.efi" $EFI_DIR
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end
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function main -d "the main function"
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checkdeps
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load_config "/etc/snap-pac-uki.json"
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get_last_snapshot
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create_uki
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create_uki "-fallback"
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copy_current
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exit 0
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end
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main
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#!/bin/fish
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for x in (ls ./hooks)
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rm "/usr/share/libalpm/hooks/$x"
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end
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for x in (ls ./scripts)
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rm "/usr/share/libalpm/scripts/$x"
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end
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