Use LVM, allow networking and more misc
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F92BA85F61F4C173
190
make-root.sh
190
make-root.sh
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@ -10,28 +10,22 @@ errormsg () {
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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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for x in $@; do
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if ! which "$x" >/dev/null 2>&1; then
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errormsg "Missing dependency $x, exiting."
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fi
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done
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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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splitargs() {
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echo "$1" | sed 's/ /\n/g'
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}
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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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--new-session \
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--die-with-parent \
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--unshare-pid \
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--unshare-uts \
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--unshare-ipc \
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@ -44,11 +38,44 @@ wrapped() {
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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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depcheck "fallocate" \
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"sfdisk" \
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"mkfs.vfat" \
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"mkfs.ext4" \
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"pvcreate" \
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"vgcreate" \
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"lvcreate" \
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"vgchange" \
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"mkfs.btrfs" \
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"mktemp" \
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"mount" \
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"mkdir" \
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"cat" \
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"install" \
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"apk" \
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"bwrap"
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custom=false
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while getopts ':a:i:b:t:s:p:c' opt; do
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case $opt in
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(a) arch="$OPTARG";;
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(b) svcs="$svcs $OPTARG";;
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(c) custom=true;;
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(i) image="$OPTARG";;
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(p) pkgs="$pkgs $OPTARG";;
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(s) size="$OPTARG";;
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(t) ttys="$ttys $OPTARG";;
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esac
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done
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: "${image:=nnd-rootfs}"
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: "${arch:=x86_64}"
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: "${svcs:=bundle.core bundle.net}"
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: "${size:=1G}"
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# Set up file as loopback
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fallocate -v -l 1G "$image"
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fallocate -v -l "$size" "$image"
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if ! [ -r "$image" ]; then
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errormsg "Something went wrong while preallocating sparse image"
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fi
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@ -68,14 +95,22 @@ EOT
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# Format partitions
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mkfs.vfat -n nnd-efi "${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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VGN="nnd"
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LVN="rootlv"
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pvcreate "${loopback}p3"
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vgcreate "$VGN" "${loopback}p3"
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lvcreate "$VGN" -n "$LVN" -l '100%FREE'
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vgchange -a y "$VGN"
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mkfs.btrfs -L nnd-root "/dev/$VGN/$LVN"
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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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mount -v -t btrfs "/dev/$VGN/$LVN" "$tmpdir"
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mkdir -p "$tmpdir/boot"
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mount -v -t ext4 "${loopback}p2" "$tmpdir/boot"
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@ -96,7 +131,7 @@ https://dl-cdn.alpinelinux.org/alpine/latest-stable/community
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EOF
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) "$tmpdir"/etc/apk/repositories
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# Set up basic rootfs
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# Set up bootstrap rootfs
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apk add \
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-v \
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--initdb \
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@ -104,59 +139,20 @@ apk add \
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--root "$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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busybox \
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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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apk-tools
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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/"$bundle"
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done
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wrapped nnd-s6 dist
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wrapped nnd-s6 generate
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wrapped nnd-s6 swap
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# Set-up alpine init
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## Add btrfs to required initrd modules
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## Add btrfs and lvm to required initrd modules
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# TODO: Only append and don't replace
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install -Dm444 <(
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cat <<EOF
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features="ata base btrfs cdrom ext4 keymap kms mmc nvme raid scsi usb virtio"
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features="ata base lvm btrfs ext4 cdrom keymap kms mmc nvme raid scsi usb virtio"
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EOF
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) "$tmpdir"/etc/mkinitfs/mkinitfs.conf
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wrapped sh -c 'mkinitfs $(find /lib/modules -mindepth 1 -maxdepth 1 -type d)'
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# Regenerate grub config
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## Provide temporary override for grub, TODO: provide our own grub cfgs eventually
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install -Dm444 <(
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cat <<EOF
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@ -169,13 +165,73 @@ GRUB_CMDLINE_LINUX="root=LABEL=nnd-root rootfstype=btrfs"
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EOF
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) "$tmpdir"/etc/default/grub
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wrapped grub-mkconfig -o /boot/grub/grub.cfg
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# 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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) "$tmpdir"/etc/resolv.conf
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# Set up rest of rootfs
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wrapped apk add -v \
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nnd \
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linux-full \
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nnd-s6-linux-init-default \
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nnd-s6-services \
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grub-efi \
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iproute2 \
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bcnm@edge \
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mdevd \
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mdev-conf \
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utmps \
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findmnt \
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dosfstools \
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e2fsprogs \
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btrfs-progs \
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$pkgs
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# Install grub to ESP
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wrapped grub-install --removable --efi-directory /boot/efi --boot-directory /boot
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# Set-up s6
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# Set-up extra tty if given
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if [ ! -z "$ttys" ]; then
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splitargs "$ttys" | \
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while read -r tty; do
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[ -z "$tty" ] && continue
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cp -rv "$tmpdir"/usr/share/nnd/s6/dist/rc/getty.tty1 "$tmpdir"/etc/s6/rc/getty."$tty"
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sed -i 's/tty1/'"$tty"'/g' "$tmpdir"/etc/s6/rc/getty."$tty"/run
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done
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fi
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# Set-up services
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splitargs "$svcs" | \
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while read -r bundle; do
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[ -z "$bundle" ] && continue
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touch "$tmpdir"/etc/s6/rc/default/contents.d/"$bundle"
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done
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wrapped nnd-s6 dist
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wrapped nnd-s6 generate
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wrapped nnd-s6 swap
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# Unlock root login
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wrapped passwd -ud root
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# Provide basic shell for customization
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if "$custom"; then
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echo "You are now entering your image's shell."
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echo "Any customizations made here will remain in the image."
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echo "Upon exit, the image will be packed."
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wrapped sh || true # Handle graceful exit
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fi
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# Cleanup
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umount -Rv "$tmpdir"
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vgchange -a n "$VGN"
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rmdir -v "$tmpdir"
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losetup -d "$loopback"
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