100 lines
2.5 KiB
Bash
Executable file
100 lines
2.5 KiB
Bash
Executable file
#!/usr/bin/env bash
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# this step requires either root access or access to fuse
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# nix builder doesnt have access to either
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# i could run this in a vm, but that's slow as fuck because i'm building this on x86_64-linux
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# usage: image.sh [path to image.nix output]
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set -euxo pipefail
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which zstd || exit 1
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userspace="$(which lklfuse >/dev/null && echo -n 1 || echo -n)"
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use_rsync="$(which rsync >/dev/null && echo -n 1 || echo -n)"
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function Mount() {
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if [[ "$userspace" == "1" ]]; then
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if [[ "${4-}" == "ro" ]]; then
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lklfuse -o "type=$1" -o "$4" "$2" "$3"
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elif [ -n "${4-}" ]; then
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lklfuse -o "type=$1" -o "opts=$4" "$2" "$3"
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else
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lklfuse -o "type=$1" "$2" "$3"
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fi
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elif [ -n "${4-}" ]; then
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sudo -A mount -t "$1" -o "loop,$4" "$2" "$3"
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else
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sudo -A mount -t "$1" -o loop "$2" "$3"
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fi
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}
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function run() {
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if [[ "$userspace" == "1" ]]; then
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"$@"
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else
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sudo -A "$@"
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fi
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}
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function cpr() {
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if [[ "$use_rsync" == "1" ]]; then
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run rsync -a --info=progress2 "$1/" "$2/"
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else
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run cp -rv "$1"/* "$2/"
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fi
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}
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if [ -z "$1" ]; then
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echo "missing argument"
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exit 1
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fi
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rootfs="$1/rootfs.ext4"
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template="$1/template.btrfs.zst"
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image="$1/image.img.zst"
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boot="$1/boot"
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metadata0="$(head -n1 "$1/metadata")"
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metadata1="$(head -n2 "$1/metadata" | tail -n1)"
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if [ -z "$metadata0" ] || [ -z "$metadata1" ] || [[ "$metadata0" == "$metadata1" ]]; then
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echo "invalid metadata"
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exit 1
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fi
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tmp=$(mktemp -d)
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cp "$template" "$tmp/template.btrfs.zst"
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cp "$image" "$tmp/image.img.zst"
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template="$tmp/template.btrfs"
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image="$tmp/image.img"
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unzstd --rm "$template.zst"
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unzstd --rm "$image.zst"
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chmod +w "$template" "$image"
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function cleanup {
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run umount "$rootfs" || echo -n
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run umount "$tmp/out" || echo -n
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rm -rf "$tmp"
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}
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trap cleanup EXIT
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mkdir -p "$tmp/rootfs" "$tmp/out"
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Mount ext4 "$rootfs" "$tmp/rootfs" ro
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rootfs="$tmp/rootfs"
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Mount btrfs "$template" "$tmp/out"
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cpr "$boot" "$tmp/out/@boot"
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run umount "$tmp/out"
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Mount btrfs "$template" "$tmp/out" "compress=zstd:15"
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run cp -v "$rootfs/nix-path-registration" "$tmp/out/@/"
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# those two are the only dirs needed for impermanence in boot stage 1
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run mkdir -p "$tmp/out/@/var/lib/nixos"
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run mkdir -p "$tmp/out/@/var/log"
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# secrets, we don't want to pass them via the store
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run mkdir -p "$tmp/out/@/secrets"
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run cp -v /secrets/nixos/wireguard-key "$tmp/out/@/secrets/"
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run chmod -R 000 "$tmp/out/@/secrets"
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cpr "$rootfs/nix" "$tmp/out/@nix"
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run umount "$rootfs"
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run umount "$tmp/out"
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dd conv=notrunc if="$template" of="$image" seek="$metadata0"
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zstd -f --rm --compress "$image" -o ./image.img.zst
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