Initial commit
This commit is contained in:
commit
5b78486868
GPG Key ID:
F92BA85F61F4C173
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#!/bin/sh
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# Exit on any errors
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set -e
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errormsg () {
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echo "$1" >&2
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exit 1
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}
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# Check deps
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depcheck() {
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if ! which "$1" >/dev/null 2>&1; then
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errormsg "Missing dependency $1, exiting."
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fi
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}
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depcheck "fallocate"
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depcheck "sfdisk"
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depcheck "mkfs.vfat"
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depcheck "mkfs.ext4"
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depcheck "mkfs.btrfs"
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depcheck "mktemp"
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depcheck "mount"
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depcheck "mkdir"
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depcheck "cat"
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depcheck "install"
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depcheck "apk"
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depcheck "bwrap"
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# BWRAP "chrooting"
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wrapped() {
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bwrap \
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--unshare-net \
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--unshare-pid \
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--unshare-uts \
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--unshare-ipc \
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--bind "$tmpdir" / \
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--dev-bind /dev /dev \
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--ro-bind /sys /sys \
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--proc /proc \
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--tmpfs /tmp \
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--tmpfs /run \
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-- $@
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}
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image="${1:-nnd-rootfs}"
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arch="${2:-x86_64}"
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# Set up file as loopback
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fallocate -v -l 1G "$image"
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if ! [ -r "$image" ]; then
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errormsg "Something went wrong while preallocating sparse image"
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fi
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loopback="$(losetup --show -P -f "$image")"
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if ! [ -r "$loopback" ]; then
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errormsg "Something went wrong while setting up loopback image"
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fi
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# Create partition table
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sfdisk "$loopback" <<EOT
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label: gpt
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size=64MiB,name=nnd-efi,type=U
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size=256MiB,name=nnd-boot,type=L
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name=nnd-root,type=L
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EOT
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# Format partitions
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mkfs.vfat -n nnd-efi "${loopback}p1"
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mkfs.ext4 -L nnd-boot "${loopback}p2"
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mkfs.btrfs -L nnd-root "${loopback}p3"
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# Set up chroot
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tmpdir="$(mktemp -d "nnd-image.XXXXXXXXXX")"
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if [ -z "$tmpdir" ]; then
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errormsg "Something went wrong during working directory preparation, bailing out"
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fi
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mount -v -t btrfs "${loopback}p3" "$tmpdir"
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mkdir -p "$tmpdir/boot"
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mount -v -t ext4 "${loopback}p2" "$tmpdir/boot"
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mkdir -p "$tmpdir/boot/efi"
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mount -v -t vfat "${loopback}p1" "$tmpdir/boot/efi"
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install -Dm444 <(
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cat <<EOF
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https://packages.redxen.eu/nnd/main
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https://dl-cdn.alpinelinux.org/alpine/latest-stable/main
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https://dl-cdn.alpinelinux.org/alpine/latest-stable/community
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@edge https://dl-cdn.alpinelinux.org/alpine/edge/main
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@edge https://dl-cdn.alpinelinux.org/alpine/edge/community
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@edge https://dl-cdn.alpinelinux.org/alpine/edge/testing
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EOF
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) "$tmpdir"/etc/apk/repositories
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# Set up basic rootfs
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apk add \
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-v \
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--initdb \
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--allow-untrusted \
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--root "$tmpdir" \
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--repositories-file "$tmpdir/etc/apk/repositories" \
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--arch "$arch" \
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nnd \
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lfsbase \
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nnd-signkey \
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alpine-keys \
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linux-full \
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nnd-s6-linux-init-default \
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nnd-s6-services \
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busybox \
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grub-efi \
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iproute2 \
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bcnm@edge \
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mdevd \
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mdev-conf \
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utmps \
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findmnt \
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dosfstools \
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e2fsprogs \
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btrfs-progs
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echo 'NOTE: It is expected that grub would fail to generate a config at this stage, "failed to get canonical path" errors are safe to ignore' >&2
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# Set up default resolv.conf (in case no DNS server is configured via DHCP or otherwise)
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## TODO: Maybe distribute this via packages?
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install -Dm644 <(
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cat <<EOF
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nameserver 2606:4700:4700::1111
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nameserver 2606:4700:4700::1001
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nameserver 1.1.1.1
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nameserver 1.0.0.1
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EOF
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) "$tmpdir"/etc/resolv.conf
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# Set-up s6
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for bundle in bundle.core bundle.net; do
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touch "$tmpdir"/etc/s6/rc/default/contents.d/"$bundle"
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done
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wrapped nnd-s6 dist
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wrapped nnd-s6 generate
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wrapped nnd-s6 swap
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# Set-up alpine init
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## Add btrfs to required initrd modules
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install -Dm444 <(
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cat <<EOF
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features="ata base btrfs cdrom ext4 keymap kms mmc nvme raid scsi usb virtio"
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EOF
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) "$tmpdir"/etc/mkinitfs/mkinitfs.conf
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wrapped sh -c 'mkinitfs $(find /lib/modules -mindepth 1 -maxdepth 1 -type d)'
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# Regenerate grub config
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## Provide temporary override for grub, TODO: provide our own grub cfgs eventually
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install -Dm444 <(
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cat <<EOF
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GRUB_DISTRIBUTOR="nnd"
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GRUB_TIMEOUT=2
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GRUB_DISABLE_SUBMENU=y
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GRUB_DISABLE_RECOVERY=true
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GRUB_CMDLINE_LINUX_DEFAULT="loglevel=3"
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GRUB_CMDLINE_LINUX="root=LABEL=nnd-root rootfstype=btrfs"
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EOF
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) "$tmpdir"/etc/default/grub
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wrapped grub-mkconfig -o /boot/grub/grub.cfg
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wrapped grub-install --removable --efi-directory /boot/efi --boot-directory /boot
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# Cleanup
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umount -Rv "$tmpdir"
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rmdir -v "$tmpdir"
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losetup -d "$loopback"
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