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diff --git a/dabuild.in b/dabuild.in
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+#!/bin/sh
+
+# Copyright (C) 2019 Richard Mortier <mort@cantab.net>
+# Licensed under the MIT License, https://opensource.org/licenses/MIT
+
+set -e
+
+## debug
+if [ "$DABUILD_DEBUG" = "true" ]; then
+  set -x
+  PS4='$LINENO: '
+fi
+
+## check running from within an `aports` tree
+if [ "${PWD%*/aports*}" = "$PWD" ]; then
+  echo "Error: expecting to be run from within an aports tree!"
+  echo "Could not find '/aports' in the current path ($PWD)"
+  exit 1
+fi
+
+## use branch to figure out most appropriate alpine version
+if [ "$DABUILD_VERSION" ]; then
+  ABUILD_VERSION=$DABUILD_VERSION
+else
+  APORTS_BRANCH=$(git status | head -1)
+  APORTS_BRANCH="${APORTS_BRANCH##*[ /]}"
+  case $APORTS_BRANCH in
+    [[:digit:]].[[:digit:]]-stable )
+      ABUILD_VERSION=${APORTS_BRANCH%-stable}
+      ;;
+
+    * )
+      ABUILD_VERSION=edge
+      ;;
+  esac
+fi
+
+## setup volumes; use named volumes as cache if desired
+ABUILD_VOLUMES="
+    -v ${HOME}/.abuild:/home/builder/.abuild
+    -v ${PWD%/aports*}/aports:/home/builder/aports
+    -v ${PWD%/aports*}/packages:/home/builder/packages
+"
+if [ "$DABUILD_CACHE" = "true" ]; then
+  for v in %%ABUILD_VOLUMES%% ; do
+    vol=abuild-$ABUILD_VERSION-${v//\//_}
+    if [ "$DABUILD_CLEAN" = "true" ]; then
+      ## clean the cache if requested
+      docker rm -f $(docker ps -qaf "volume=$vol") >/dev/null 2>/dev/null || true
+      docker volume rm $vol >/dev/null
+      docker volume create $vol >/dev/null
+    fi
+    ABUILD_VOLUMES="$ABUILD_VOLUMES -v $vol:/$v"
+  done
+fi
+
+## go!
+ABUILD_WORKDIR=/home/builder/aports${PWD#*/aports}
+DOCKER="docker run -ti $ABUILD_VOLUMES -e DABUILD_DEBUG $DABUILD_ARGS"
+$DOCKER --workdir $ABUILD_WORKDIR %%ABUILD_IMAGE%%:$ABUILD_VERSION "$@"