Emir Beganovic
41fa32d671
The seal read /boot/EFI/Linux/omarchy_linux-omarchy.efi. An edge install has linux-omarchy-bore, so the first nightly run stopped there. It now asks the running system which kernel package it booted and takes that UKI, and takes the command line from /proc/cmdline, since the boot entry, not the UKI, may be what holds it. The nightly's package report names the kernel the same way.
153 lines
7.3 KiB
Bash
Executable File
153 lines
7.3 KiB
Bash
Executable File
#!/bin/bash
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# Turns an installed Omarchy disk (test/integration's base image) into an image anyone can
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# download and boot: every boot is its own machine, nothing of the build is
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# left in it, and it boots straight into its kernel, so a boot takes seconds.
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#
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# vm-seal <installed_dir> <sealed_dir>
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#
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# installed_dir holds base.qcow2, OVMF_VARS.4m.fd and id_ed25519, which is
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# what test/integration leaves in test-runs/<iso>-integration once its install
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# has passed. sealed_dir gets a standalone, zstd-compressed base.qcow2, the
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# firmware variables that boot it through UEFI, and the UKI's vmlinuz, initrd
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# and cmdline for booting it directly. It holds no key: each boot is handed
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# one (see vm-boot).
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#
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# The image keeps the installer's user and password (GUEST_PASSWORD, default
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# omarchy) for the desktop and sudo. SSH takes keys only.
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set -euo pipefail
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[[ $# -eq 2 ]] || { echo "Usage: vm-seal <installed_dir> <sealed_dir>" >&2; exit 2; }
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in=$(realpath "$1") out=$(realpath -m "$2")
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pw=${GUEST_PASSWORD:-omarchy}
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for fw in /usr/share/edk2/x64/OVMF_CODE.4m.fd /usr/share/OVMF/OVMF_CODE_4M.fd; do
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[[ -f $fw ]] && { fw_code=$fw; break; }
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done
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: "${fw_code:?no OVMF firmware found}"
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state=$(mktemp -d /var/tmp/seal.XXXXXX)
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cleanup() {
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local status=$? pid
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if [[ -f $state/qemu.pid ]]; then
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pid=$(cat "$state/qemu.pid")
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kill "$pid" 2>/dev/null || true
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for _ in $(seq 1 50); do kill -0 "$pid" 2>/dev/null || break; sleep 0.1; done
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fi
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rm -rf "$state"
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exit "$status"
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}
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trap cleanup EXIT
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port=$(( 30000 + RANDOM % 5000 ))
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ssh_vm() {
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ssh -i "$in/id_ed25519" -p "$port" -o BatchMode=yes -o IdentitiesOnly=yes \
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-o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null \
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-o ConnectTimeout=2 -o LogLevel=ERROR omarchy@127.0.0.1 "$@"
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}
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# Runs a script as root in the guest and fails if any line of it fails. The
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# password goes to sudo on stdin, never into a command line.
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root() {
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printf '%s\n' "$pw" | ssh_vm "sudo -S -p '' bash -ec $(printf %q "trap 'echo \"vm-seal: failed in the guest at: \$BASH_COMMAND\" >&2' ERR
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$1")"
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}
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qemu-img create -qf qcow2 -b "$in/base.qcow2" -F qcow2 "$state/edit.qcow2"
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cp "$in/OVMF_VARS.4m.fd" "$state/vars.fd"
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qemu-system-x86_64 -cpu host -enable-kvm -machine q35,accel=kvm -smp 4 -m 4G \
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-drive if=pflash,format=raw,readonly=on,file="$fw_code" \
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-drive if=pflash,format=raw,file="$state/vars.fd" \
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-drive "file=$state/edit.qcow2,format=qcow2,if=virtio,discard=unmap" -display none \
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-netdev "user,id=n0,hostfwd=tcp:127.0.0.1:$port-:22" -device virtio-net-pci,netdev=n0 \
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-pidfile "$state/qemu.pid" -daemonize
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for i in $(seq 1 150); do
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ssh_vm true 2>/dev/null && break
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(( i < 150 )) || { echo "vm-seal: no ssh on the installed disk" >&2; exit 1; }
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sleep 2
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done
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# Let first-boot work finish before taking it apart.
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ssh_vm 'timeout 180 systemctl is-system-running --wait >/dev/null 2>&1 || true'
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mkdir -p "$out"
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# The kernel that is running: edge installs linux-omarchy-bore where stable
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# installs linux-omarchy, and the boot entry, not the UKI, may hold the
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# command line.
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kernel=$(ssh_vm 'cat "/usr/lib/modules/$(uname -r)/pkgbase"')
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root "cat /boot/EFI/Linux/omarchy_$kernel.efi" >"$state/uki.efi"
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ssh_vm 'cat /proc/cmdline' >"$state/cmdline"
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root '
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# The ISO writes autologin only for encrypted installs; a test has nobody at
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# SDDM, and a desktop check that skips for want of a session reads as a pass.
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printf "[Autologin]\nUser=omarchy\nSession=omarchy.desktop\n" >/etc/sddm.conf.d/autologin.conf
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# The image is public and its password is too, so SSH takes keys only. sshd
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# keeps the first value it reads, hence a name that sorts first.
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printf "PasswordAuthentication no\nKbdInteractiveAuthentication no\nAuthenticationMethods publickey\n" \
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>/etc/ssh/sshd_config.d/00-omarchy-vm.conf
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ssh-keygen -A >/dev/null # sshd -T needs host keys to parse; they go below
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sshd -T | grep -qix "passwordauthentication no"
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sshd -T | grep -qix "authenticationmethods publickey"
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# Empty, not "uninitialized": that string marks a first boot, and a first boot
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# applies unit presets, which on Arch disable everything not listed. Empty lets
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# systemd take the VM SMBIOS UUID (qemu -uuid) as this boot machine ID.
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# Host keys come back from sshdgenkeys.service before sshd starts.
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: >/etc/machine-id
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rm -f /var/lib/dbus/machine-id /etc/ssh/ssh_host_*
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rm -f /home/omarchy/.ssh/authorized_keys /home/omarchy/.bash_history /root/.bash_history
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# The factory snapshot the installer took carries the same machine ID.
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mkdir -p /run/seal-top
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mount -o subvolid=5 "$(findmnt -no SOURCE / | sed "s/\[.*//")" /run/seal-top
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if [ -f /run/seal-top/@factory/etc/machine-id ]; then
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ro=$(btrfs property get -ts /run/seal-top/@factory ro)
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[ "$ro" = ro=false ] || btrfs property set -ts /run/seal-top/@factory ro false
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: >/run/seal-top/@factory/etc/machine-id
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[ "$ro" = ro=false ] || btrfs property set -ts /run/seal-top/@factory ro true
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fi
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umount /run/seal-top
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# Stopping the unit saves a seed; with it stopped, shutdown saves none.
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systemctl stop systemd-random-seed.service
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rm -f /var/lib/systemd/random-seed /var/lib/systemd/credential.secret
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# Leases and the key NetworkManager derives stable addresses from.
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systemctl stop NetworkManager.service
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rm -f /var/lib/NetworkManager/*.lease /var/lib/NetworkManager/secret_key \
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/var/lib/NetworkManager/seen-bssids /var/lib/NetworkManager/timestamps \
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/var/lib/NetworkManager/NetworkManager.state
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# Vacuuming leaves the active journal. Send journald to /run, then the
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# build logs on disk can go, and shutdown writes nothing back.
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journalctl --relinquish-var
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rm -rf /var/log/journal/*
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test ! -s /etc/machine-id
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test -z "$(ls /etc/ssh/ssh_host_* /var/lib/NetworkManager/*.lease /var/log/journal/* 2>/dev/null)"
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test ! -e /home/omarchy/.ssh/authorized_keys
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test ! -e /var/lib/systemd/random-seed
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sync
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# Hand freed blocks back to the disk image, so the copy skips them.
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fstrim -av >/dev/null
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(sleep 1; systemctl poweroff) >/dev/null 2>&1 &'
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# The key that let us in is gone, so the poweroff above was the last word.
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pid=$(cat "$state/qemu.pid")
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for _ in $(seq 1 120); do kill -0 "$pid" 2>/dev/null || break; sleep 1; done
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if kill -0 "$pid" 2>/dev/null; then echo "vm-seal: the VM did not power off" >&2; exit 1; fi
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rm -f "$state/qemu.pid"
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# Direct boot skips the firmware and Limine, which spend most of a boot reading
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# and hashing the UKI. resume= points at the image's own swap, so drop it.
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objcopy -O binary --only-section=.linux "$state/uki.efi" "$out/vmlinuz"
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objcopy -O binary --only-section=.initrd "$state/uki.efi" "$out/initrd"
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tr -d '\0' <"$state/cmdline" | tr ' ' '\n' | { grep -vE '^(resume|resume_offset)=|^$' || true; } | paste -sd' ' >"$out/cmdline"
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[[ -s $out/vmlinuz && -s $out/initrd && -s $out/cmdline ]] || { echo "vm-seal: the UKI gave no kernel, initrd or cmdline" >&2; exit 1; }
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# zstd clusters: QEMU reads them as they are, so the download boots as it is.
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qemu-img convert -c -O qcow2 -o compression_type=zstd -m 16 -W "$state/edit.qcow2" "$out/base.qcow2"
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# The variables hold the boot entry the installer registered; a firmware boot
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# of this disk needs them, a direct kernel boot does not.
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cp "$in/OVMF_VARS.4m.fd" "$out/OVMF_VARS.4m.fd"
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( cd "$out" && sha256sum base.qcow2 OVMF_VARS.4m.fd vmlinuz initrd cmdline >SHA256SUMS )
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echo "sealed: $out ($(du -sh "$out/base.qcow2" | cut -f1)); cmdline: $(cat "$out/cmdline")"
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