tfld/snap-pac-uki
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refactor: ♻️ start another rewrite with much smaller scope

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This commit is contained in:
Adrian Wannenmacher 2021-02-12 00:41:24 +01:00
parent 333b8d06fe
commit 4e7e835bd9
Signed by: tfld
GPG Key ID: 19D986ECB1E492D5
4 changed files with 119 additions and 140 deletions
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12
pacman/hooks/01_snap-pac-uki_pre.hook
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[Trigger]
Operation = Upgrade
Operation = Install
Operation = Remove
Type = Package
Target = *
[Action]
Description = Performing pre UKI creation...
When = PreTransaction
Exec = /usr/local/bin/snap-pac-uki-create.fish
AbortOnFail

11
pacman/hooks/zz_snap-pac-uki_post.hook
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[Trigger]
Operation = Upgrade
Operation = Install
Operation = Remove
Type = Package
Target = *
[Action]
Description = Performing post UKI creation...
When = PostTransaction
Exec = /usr/local/bin/snap-pac-uki-create.fish

117
pacman/snap-pac-uki-create.fish
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#!/bin/fish
function error -d "prints an error and terminates the program" -a error
echo $error
exit 1
end
function checkdeps -d "check for depenencies"
set -l deps "jq" "snapper" "efibootmgr" "rg"
for dep in $deps
which $dep >/dev/null 2>/dev/null
if test $status != "0"
error "didn't find depenecy: $dep"
end
end
end
function load_config -d "loads the config from a config file" -a cfg
# set default values
set -g BUILD_PATH "/tmp/snap-pac-uki"
set -g EFI_DIR "/efi/EFI/Linux/"
set -g EFI_PATH '\EFI\Linux'
set -g SNAPPER_CONFIG "root"
set -g SNAPSHOT_SUBVOL "@snapshots"
set -g ROOT_SUBVOL "@"
# load file
set -l cfg (jq -c <$cfg)
# parse config
set -l cfgs "build_path" "efi_dir" "efi_dev" "efi_part" "efi_path" "kernel_cmd" "fallback_cmd" "snapper_config" "snapshot_subvol" "root_subvol"
for c in $cfgs
echo $cfg | jq -e ".$c" >/dev/null
switch $status
case "0"
set -g (echo $c | sed "s/./\U&/g") (echo $cfg | jq -r ".$c")
case "4"
error "failed to parse option: $c"
end
end
# check for mandatory options
set -l mandatory_cfgs "kernel_cmd" "fallback_cmd" "efi_dev" "efi_part"
for mc in $mandatory_cfgs
set -gq (echo $mc | sed "s/./\U&/g")
if test $status != 0
error "missing config parameter: $mc"
end
end
end
function get_last_snapshot -d "reads the last snapper snapshot id"
set -g SNAPSHOT_ID (snapper -c $SNAPPER_CONFIG --jsonout ls | jq ".$SNAPPER_CONFIG | last | .number")
end
function create_uki -d "creates a new uki"
# prepare directory
set -l bp "$BUILD_PATH/$SNAPSHOT_ID"
mkdir -p $bp
rm -rf "$bp/*"
# os-release
cp /usr/lib/os-release "$bp/os-release"
sed "s/BUILD_ID=.*/BUILD_ID=fallback/" </usr/lib/os-release | sed "s/PRETTY_NAME=\"\(.*\)\"/PRETTY_NAME=\"\1 (Fallback)\"/" >"$bp/os-release-fallback"
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"
# kernel cmd
echo $KERNEL_CMD | sed "s/SNAPSHOT/$ROOT_SUBVOL/" >"$bp/kernel-cmd"
echo $FALLBACK_CMD | sed "s/SNAPSHOT/$ROOT_SUBVOL/" >"$bp/kernel-cmd-fallback"
echo $KERNEL_CMD | sed "s/SNAPSHOT/$SNAPSHOT_SUBVOL\\/$SNAPSHOT_ID\\/snapshot/" >"$bp/kernel-cmd-snapshot"
# create uki
objcopy \
--add-section .osrel="$bp/os-release" --change-section-vma .osrel=0x20000 \
--add-section .cmdline="$bp/kernel-cmd" --change-section-vma .cmdline=0x30000 \
--add-section .splash="/usr/share/systemd/bootctl/splash-arch.bmp" --change-section-vma .splash=0x40000 \
--add-section .linux="/boot/vmlinuz-linux" --change-section-vma .linux=0x2000000 \
--add-section .initrd="/boot/initramfs-linux.img" --change-section-vma .initrd=0x3000000 \
"/usr/lib/systemd/boot/efi/linuxx64.efi.stub" "$bp/arch-linux.efi"
objcopy \
--add-section .osrel="$bp/os-release-fallback" --change-section-vma .osrel=0x20000 \
--add-section .cmdline="$bp/kernel-cmd-fallback" --change-section-vma .cmdline=0x30000 \
--add-section .splash="/usr/share/systemd/bootctl/splash-arch.bmp" --change-section-vma .splash=0x40000 \
--add-section .linux="/boot/vmlinuz-linux" --change-section-vma .linux=0x2000000 \
--add-section .initrd="/boot/initramfs-linux-fallback.img" --change-section-vma .initrd=0x3000000 \
"/usr/lib/systemd/boot/efi/linuxx64.efi.stub" "$bp/arch-linux-fallback.efi"
objcopy \
--add-section .osrel="$bp/os-release-snapshot" --change-section-vma .osrel=0x20000 \
--add-section .cmdline="$bp/kernel-cmd-snapshot" --change-section-vma .cmdline=0x30000 \
--add-section .splash="/usr/share/systemd/bootctl/splash-arch.bmp" --change-section-vma .splash=0x40000 \
--add-section .linux="/boot/vmlinuz-linux" --change-section-vma .linux=0x2000000 \
--add-section .initrd="/boot/initramfs-linux.img" --change-section-vma .initrd=0x3000000 \
"/usr/lib/systemd/boot/efi/linuxx64.efi.stub" "$bp/arch-linux-$SNAPSHOT_ID.efi"
end
function add_efi_entry -d "adds a boot entry to efi"
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
end
function main -d "the main function"
checkdeps
load_config "/etc/snap-pac-uki.json"
get_last_snapshot
create_uki
cp $BUILD_PATH/$SNAPSHOT_ID/*.efi "$EFI_DIR"
add_efi_entry
exit 0
end
main

119
src/snap-pac-uki.fish Executable file
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#!/bin/fish
function error -d "prints an error and exits" -a error
echo $error 1>&2
exit 1
end
function check_deps -d "checks if all dependencies are available"
set -l dependencies \
"efibootmgr" \
"jq" \
"sed" \
"snapper" \
for dep in $dependencies
which $dep >/dev/null 2>/dev/null
if test $status != "0"
error "missing depenency: $dep"
end
end
end
function config -d "sets some configuration variables"
set -g CFG_BUILD_DIR "/tmp/snap-pac-uki"
set -g CFG_DEFAULT_SUBVOL "@"
set -g CFG_EFI_DEV "/dev/nvme0n1"
set -g CFG_EFI_PATH "\EFI\Linux"
set -g CFG_EFI_PART "1"
set -g CFG_SNAPSHOT_CONFIG "root"
set -g CFG_SNAPSHOT_PATH "/.snapshots"
set -g CFG_SNAPSHOT_SUBVOL "@snapshots"
set -g CFG_UKI_DIR "/efi/EFI/Linux"
end
function find_tasks -d "finds out what the program needs to do"
set -ge TASK_UKI
for id in (snapper -c $CFG_SNAPSHOT_CONFIG --jsonout ls | jq ".$CFG_SNAPSHOT_CONFIG [] | .number")
if test "$id" = "0"
continue
end
if test -f "$CFG_UKI_DIR/arch-linux-$id.efi"
continue
end
set -ga TASK_UKI $id
end
end
function create_uki -d "creates a new uki" -a variant id
switch $variant
case "rolling"
set bd "$CFG_BUILD_DIR/current"
case "fallback"
set bd "$CFG_BUILD_DIR/current"
set fallback "-fallback"
case "snapshot"
set bd "$CFG_BUILD_DIR/$id"
set snid "-$id"
set prefix "$CFG_SNAPSHOT_PATH/$id/snapshot"
case "*"
error "unknown uki variant: $variant"
end
objcopy \
--add-section .osrel="$bd/os-release$fallback" --change-section-vma .osrel=0x20000 \
--add-section .cmdline="$bd/kernel-cmd$fallback" --change-section-vma .cmdline=0x30000 \
--add-section .splash="$prefix/usr/share/systemd/bootctl/splash-arch.bmp" --change-section-vma .splash=0x40000 \
--add-section .linux="$prefix/boot/vmlinuz-linux" --change-section-vma .linux=0x2000000 \
--add-section .initrd="$prefix/boot/initramfs-linux$fallback.img" --change-section-vma .initrd=0x3000000 \
"$prefix/usr/lib/systemd/boot/efi/linuxx64.efi.stub" "$bp/arch-linux$fallback$snid.efi"
end
function add_efi_entry -d "adds an efi boot entry for a snapshot uki" -a id
efibootmgr -q -C -d $CFG_EFI_DEV -p $CFG_EFI_PART \
-l "$EFI_PATH\arch-linux-$id.efi" \
-L "Arch Linux (Snapshot $id)"
end
function create_snapshot_uki -d "creates an uki for a snapshot" -a id
# create build directory
set bd "$CFG_BUILD_DIR/$id"
if test -f $bd
error "build dir for snapshot $id is a file"
else if test -d $bd
rm -rf "$bd/*"
else
mkdir $bd
end
# prepare files
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"
sed "s/SNAPSHOT/$CFG_SNAPSHOT_SUBVOL/" <"$CFG_SNAPSHOT_PATH/$id/snapshot/etc/snap-pac-uki/kernel-cmd" >"$bd/kernel-cmd"
# create uki
create_uki snapshot $id
add_efi_entry $id
end
function main
# prepare for execution
check_deps
config
switch $argv[1]
case "snapshots"
find_tasks
for id in $TASK_UKI
create_snapshot_uki $id
end
case "*"
error "unknown command"
end
end
main $argv