refactor: ♻️ start another rewrite with much smaller scope
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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/local/bin/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/local/bin/snap-pac-uki-create.fish
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#!/bin/fish
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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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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" "efibootmgr" "rg"
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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: $dep"
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end
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end
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end
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function load_config -d "loads the config from a config file" -a cfg
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# set default values
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set -g BUILD_PATH "/tmp/snap-pac-uki"
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set -g EFI_DIR "/efi/EFI/Linux/"
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set -g EFI_PATH '\EFI\Linux'
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set -g SNAPPER_CONFIG "root"
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set -g SNAPSHOT_SUBVOL "@snapshots"
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set -g ROOT_SUBVOL "@"
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# load file
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set -l cfg (jq -c <$cfg)
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# parse config
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set -l cfgs "build_path" "efi_dir" "efi_dev" "efi_part" "efi_path" "kernel_cmd" "fallback_cmd" "snapper_config" "snapshot_subvol" "root_subvol"
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for c in $cfgs
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echo $cfg | jq -e ".$c" >/dev/null
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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" "efi_dev" "efi_part"
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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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end
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function create_uki -d "creates a new uki"
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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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cp /usr/lib/os-release "$bp/os-release"
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sed "s/BUILD_ID=.*/BUILD_ID=fallback/" </usr/lib/os-release | sed "s/PRETTY_NAME=\"\(.*\)\"/PRETTY_NAME=\"\1 (Fallback)\"/" >"$bp/os-release-fallback"
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sed "s/BUILD_ID=.*/BUILD_ID=\"snapshot $SNAPSHOT_ID\"/" </usr/lib/os-release | sed "s/PRETTY_NAME=\"\(.*\)\"/PRETTY_NAME=\"\1 (Snapshot $SNAPSHOT_ID)\"/" >"$bp/os-release-snapshot"
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# kernel cmd
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echo $KERNEL_CMD | sed "s/SNAPSHOT/$ROOT_SUBVOL/" >"$bp/kernel-cmd"
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echo $FALLBACK_CMD | sed "s/SNAPSHOT/$ROOT_SUBVOL/" >"$bp/kernel-cmd-fallback"
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echo $KERNEL_CMD | sed "s/SNAPSHOT/$SNAPSHOT_SUBVOL\\/$SNAPSHOT_ID\\/snapshot/" >"$bp/kernel-cmd-snapshot"
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# create uki
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objcopy \
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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" "$bp/arch-linux.efi"
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objcopy \
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--add-section .osrel="$bp/os-release-fallback" --change-section-vma .osrel=0x20000 \
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--add-section .cmdline="$bp/kernel-cmd-fallback" --change-section-vma .cmdline=0x30000 \
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--add-section .splash="/usr/share/systemd/bootctl/splash-arch.bmp" --change-section-vma .splash=0x40000 \
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--add-section .linux="/boot/vmlinuz-linux" --change-section-vma .linux=0x2000000 \
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--add-section .initrd="/boot/initramfs-linux-fallback.img" --change-section-vma .initrd=0x3000000 \
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"/usr/lib/systemd/boot/efi/linuxx64.efi.stub" "$bp/arch-linux-fallback.efi"
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objcopy \
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--add-section .osrel="$bp/os-release-snapshot" --change-section-vma .osrel=0x20000 \
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--add-section .cmdline="$bp/kernel-cmd-snapshot" --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" "$bp/arch-linux-$SNAPSHOT_ID.efi"
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end
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function add_efi_entry -d "adds a boot entry to efi"
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efibootmgr -C -d $EFI_DEV -p $EFI_PART -l "$EFI_PATH\arch-linux-$SNAPSHOT_ID.efi" -L (rg "PRETTY_NAME" "$BUILD_PATH/$SNAPSHOT_ID/os-release-snapshot" | sed "s/PRETTY_NAME=\"\(.*\)\"/\1/") -q
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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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cp $BUILD_PATH/$SNAPSHOT_ID/*.efi "$EFI_DIR"
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add_efi_entry
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exit 0
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end
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main
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119
src/snap-pac-uki.fish
Executable file
119
src/snap-pac-uki.fish
Executable file
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#!/bin/fish
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function error -d "prints an error and exits" -a error
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echo $error 1>&2
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exit 1
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end
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function check_deps -d "checks if all dependencies are available"
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set -l dependencies \
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"efibootmgr" \
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"jq" \
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"sed" \
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"snapper" \
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for dep in $dependencies
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which $dep >/dev/null 2>/dev/null
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if test $status != "0"
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error "missing depenency: $dep"
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end
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end
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end
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function config -d "sets some configuration variables"
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set -g CFG_BUILD_DIR "/tmp/snap-pac-uki"
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set -g CFG_DEFAULT_SUBVOL "@"
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set -g CFG_EFI_DEV "/dev/nvme0n1"
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set -g CFG_EFI_PATH "\EFI\Linux"
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set -g CFG_EFI_PART "1"
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set -g CFG_SNAPSHOT_CONFIG "root"
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set -g CFG_SNAPSHOT_PATH "/.snapshots"
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set -g CFG_SNAPSHOT_SUBVOL "@snapshots"
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set -g CFG_UKI_DIR "/efi/EFI/Linux"
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end
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function find_tasks -d "finds out what the program needs to do"
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set -ge TASK_UKI
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for id in (snapper -c $CFG_SNAPSHOT_CONFIG --jsonout ls | jq ".$CFG_SNAPSHOT_CONFIG [] | .number")
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if test "$id" = "0"
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continue
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end
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if test -f "$CFG_UKI_DIR/arch-linux-$id.efi"
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continue
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end
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set -ga TASK_UKI $id
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end
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end
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function create_uki -d "creates a new uki" -a variant id
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switch $variant
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case "rolling"
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set bd "$CFG_BUILD_DIR/current"
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case "fallback"
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set bd "$CFG_BUILD_DIR/current"
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set fallback "-fallback"
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case "snapshot"
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set bd "$CFG_BUILD_DIR/$id"
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set snid "-$id"
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set prefix "$CFG_SNAPSHOT_PATH/$id/snapshot"
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case "*"
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error "unknown uki variant: $variant"
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end
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objcopy \
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--add-section .osrel="$bd/os-release$fallback" --change-section-vma .osrel=0x20000 \
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--add-section .cmdline="$bd/kernel-cmd$fallback" --change-section-vma .cmdline=0x30000 \
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--add-section .splash="$prefix/usr/share/systemd/bootctl/splash-arch.bmp" --change-section-vma .splash=0x40000 \
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--add-section .linux="$prefix/boot/vmlinuz-linux" --change-section-vma .linux=0x2000000 \
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--add-section .initrd="$prefix/boot/initramfs-linux$fallback.img" --change-section-vma .initrd=0x3000000 \
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"$prefix/usr/lib/systemd/boot/efi/linuxx64.efi.stub" "$bp/arch-linux$fallback$snid.efi"
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end
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function add_efi_entry -d "adds an efi boot entry for a snapshot uki" -a id
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efibootmgr -q -C -d $CFG_EFI_DEV -p $CFG_EFI_PART \
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-l "$EFI_PATH\arch-linux-$id.efi" \
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-L "Arch Linux (Snapshot $id)"
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end
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function create_snapshot_uki -d "creates an uki for a snapshot" -a id
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# create build directory
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set bd "$CFG_BUILD_DIR/$id"
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if test -f $bd
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error "build dir for snapshot $id is a file"
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else if test -d $bd
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rm -rf "$bd/*"
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else
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mkdir $bd
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end
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# prepare files
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sed "s/BUILD_ID=.*/BUILD_ID=\"snapshot $id\"/;s/PRETTY_NAME=\"\(.*\)\"/PRETTY_NAME=\"\1 (Snapshot $id)\"" <"$CFG_SNAPSHOT_PATH/$id/snapshot/usr/lib/os-release" >"$bd/os-release"
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sed "s/SNAPSHOT/$CFG_SNAPSHOT_SUBVOL/" <"$CFG_SNAPSHOT_PATH/$id/snapshot/etc/snap-pac-uki/kernel-cmd" >"$bd/kernel-cmd"
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# create uki
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create_uki snapshot $id
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add_efi_entry $id
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end
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function main
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# prepare for execution
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check_deps
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config
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switch $argv[1]
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case "snapshots"
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find_tasks
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for id in $TASK_UKI
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create_snapshot_uki $id
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end
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case "*"
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error "unknown command"
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end
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end
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main $argv
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