diff --git a/build-aux/smoketest.sh b/build-aux/smoketest.sh
new file mode 100755
index 00000000..e58aad87
--- /dev/null
+++ b/build-aux/smoketest.sh
@@ -0,0 +1,217 @@
+#!/bin/sh
+# Copyright (c) 2022 Jonas 'Sortie' Termansen.
+#
+# Permission to use, copy, modify, and distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+#
+# smoketest.sh
+# Test an .iso release boots and passes rudimentary tests.
+
+set -e
+
+unset display
+display="-display none"
+unset enable_kvm
+unset host
+unset hostname
+hostname=smoketest
+unset iso
+unset port
+unset qemu
+unset vm_root
+
+dashdash=
+previous_option=
+for argument do
+  if [ -n "$previous_option" ]; then
+    eval $previous_option=\$argument
+    previous_option=
+    continue
+  fi
+
+  case $argument in
+  *=?*) parameter=$(expr "X$argument" : '[^=]*=\(.*\)' || true) ;;
+  *=)   parameter= ;;
+  *)    parameter=yes ;;
+  esac
+
+  case $dashdash$argument in
+  --) dashdash=yes ;;
+  --display=*) display=$parameter ;;
+  --display) previous_option=display ;;
+  --enable-kvm) enable_kvm=-enable-kvm ;;
+  --host=*) host=$parameter ;;
+  --host) previous_option=host ;;
+  --hostname=*) hostname=$parameter ;;
+  --hostname) previous_option=hostname ;;
+  --iso=*) iso=$parameter ;;
+  --iso) previous_option=iso ;;
+  --port=*) port=$parameter ;;
+  --port) previous_option=port ;;
+  --qemu=*) qemu=$parameter ;;
+  --qemu) previous_option=qemu ;;
+  --vm-root=*) vm_root=$parameter ;;
+  --vm-root) previous_option=vm_root ;;
+  -*) echo "$0: unrecognized option $argument" >&2
+      exit 1 ;;
+  *)
+    echo "$0: unexpected extra operand $argument" >&2
+    exit 1
+    ;;
+  esac
+done
+
+if [ -n "$previous_option" ]; then
+  echo "$0: option '$argument' requires an argument" >&2
+  exit 1
+fi
+
+if [ -z "$host" ]; then
+  echo "$0: error: No --host was specified" >&2
+  exit 1
+fi
+
+if [ -z "$iso" ]; then
+  echo "$0: error: No --iso was specified" >&2
+  exit 1
+fi
+iso=$(realpath -- "$iso")
+
+if [ -z "$port" ]; then
+  echo "$0: error: No --port was specified" >&2
+  exit 1
+fi
+
+if [ -z "$qemu" ]; then
+  case "$host" in
+  i[3456]86-*) qemu=qemu-system-i386;;
+  x86_64-*) qemu=qemu-system-x86_64;;
+  *) echo "$0: error: Unable to detect qemu program for: $HOST" >&2
+     exit 1
+  esac
+fi
+
+set -x
+
+unset tmpdir
+# Reclaim a persistent VM directory (if any) and kill any leaked processes.
+if [ -n "$vm_root" ]; then
+  unset tmpdir
+  export TMPDIR="$vm_root/$hostname"
+  mkdir -p -- "$TMPDIR"
+  if [ -e "$TMPDIR/pid" ]; then
+    kill -KILL "$(cat "$TMPDIR/pid")" || true
+  fi
+  rm -rf -- "$TMPDIR"/*
+# Otherwise use a temporary directory that will be deleted upon completion.
+else
+  export TMPDIR=$(mktemp -d -t "$hostname.vm.XXXXXXXXX")
+  tmpdir="$TMPDIR"
+fi
+
+# On exit, power off the virtual machine and clean up the working directory.
+unset vmpid
+cleanup_tmpdir() {
+  if [ -n "$vmpid" ]; then
+    kill -KILL $vmpid || true
+  fi
+  rm -f "$TMPDIR/pid"
+  if [ -n "$tmpdir" ]; then
+    rm -rf -- "$tmpdir"
+  elif [ -n "$TMPDIR" ]; then
+    rm -rf -- "$TMPDIR"/*
+  fi
+}
+trap cleanup_tmpdir EXIT HUP INT QUIT
+cd "$TMPDIR"
+
+# Configure the ssh authentication and enabling sshd.
+ssh-keygen -f id_rsa -N ''
+rm -rf liveconfig bootconfig
+tix-iso-liveconfig \
+  --hostname="$hostname" \
+  --root-ssh-authorized-keys=id_rsa.pub \
+  --sshd-keygen \
+  --sshd-key-known-hosts-file=sortix.iso.known_hosts \
+  --sshd-key-known-hosts-hosts='localhost 127.0.0.1' \
+  liveconfig
+mkdir -p liveconfig/etc liveconfig/etc/init
+cat > liveconfig/etc/init/local << EOF
+require sshd optional
+EOF
+tix-iso-bootconfig \
+  --random-seed \
+  --timeout=0 \
+  --disable-gui \
+  --liveconfig=liveconfig \
+  bootconfig
+mkdir -p bootconfig/boot/grub
+cat >> bootconfig/boot/grub/hooks.cfg << EOF
+select_ports_set_no
+port_binutils=true
+port_dash=true
+port_gcc=true
+port_grep=true
+port_make=true
+port_sed=true
+port_ssh=true
+EOF
+tix-iso-add "$iso" bootconfig -o sortix.iso
+
+# Spawn the virtual machine in the background.
+$qemu \
+  $enable_kvm \
+  -name "$hostname" \
+  -nodefaults \
+  $display \
+  -m 256 \
+  -vga std \
+  -boot d \
+  -cdrom sortix.iso \
+  -device e1000,netdev=net0 \
+  -netdev user,id=net0,hostfwd=tcp:127.0.0.1:$port-:22 &
+vmpid=$!
+echo $vmpid > pid
+
+# Wait for the virtual machine to boot to sshd.
+do_ssh() {
+  ssh \
+    -i id_rsa \
+    -oUserKnownHostsFile=sortix.iso.known_hosts \
+    -oConnectionAttempts=30 \
+    -p $port \
+    root@localhost \
+    "$@"
+}
+retries=30
+while true; do
+  if ! do_ssh 'uname -a'; then
+    if [ $retries = 1 ]; then
+      exit 1
+    fi
+    sleep 1
+    if ! kill -WINCH "$vmpid"; then
+      unset vmpid
+      rm -f "$TMPDIR/pid"
+      exit 1
+    fi
+    retries=$(expr $retries - 1)
+    continue
+  fi
+  break
+done
+
+# Test for smoke.
+do_ssh 'regress'
+do_ssh 'cd /src/editor && make'
+do_ssh '! grep -Ei "failed|exited unsuccessfully" /var/log/init.log'
+do_ssh 'memstat -a && df -h'