switch to multi-stage build, prepare multi-arch build

contrib/docker/update.sh

@@ -1,7 +1,52 @@
-#!/bin/sh
-set -e
-export EBUSD_VERSION=`cat ../../VERSION`
-export EBUSD_ARCH=`docker version|grep -i "Arch[^:]*:"|tail -n 1|sed -e 's#^.*/##'`
-sed -i -e "s#^ENV EBUSD_VERSION .*\$#ENV EBUSD_VERSION ${EBUSD_VERSION}#" -e "s#^ENV EBUSD_ARCH .*\$#ENV EBUSD_ARCH ${EBUSD_ARCH}#" Dockerfile release/Dockerfile
-sed -i -e "s#^ENV EBUSD_VERSION .*\$#ENV EBUSD_VERSION ${EBUSD_VERSION}#" rpirelease/Dockerfile
+#!/bin/bash
+BASE_IMAGE=debian:stretch
+EBUSD_VERSION=`cat ../../VERSION`
 
+archs='amd64 i386 arm32v7:arm arm64v8:aarch64'
+
+function replaceTemplate () {
+  prefix=
+  suffix=
+  qemu_from_line=
+  qemu_from_copy=
+  extra_rm=
+  if [ "$arch" != "amd64" ]; then
+    qemu="${arch##*:}"
+    arch="${arch%%:*}"
+    prefix="$arch/"
+    suffix=".$arch"
+    qemu_from_line="FROM multiarch/qemu-user-static as qemu"
+    qemu_from_copy="COPY --from=qemu /usr/bin/qemu-$qemu-static /usr/bin/"
+    extra_rm=" /usr/bin/qemu-$qemu-static"
+  fi
+  sed \
+    -e "s#%QEMU_FROM_LINE%#${qemu_from_line}#g" \
+    -e "s#%BASE_IMAGE%#${prefix}${BASE_IMAGE}#g" \
+    -e "s#%QEMU_FROM_COPY%#${qemu_from_copy}#g" \
+    -e "s#%EBUSD_MAKE%#${make}#g" \
+    -e "s#%EBUSD_VERSION%#${EBUSD_VERSION}#g" \
+    -e "s#%EBUSD_VERSION_VARIANT%#${version_variant}#g" \
+    -e "s#%EBUSD_ARCH%#${arch}#g" \
+    -e "s#%EXTRA_RM%#${extra_rm}#g" \
+    -e "s#%EBUSD_UPLOAD_LINE%#${upload_line}#g" \
+    Dockerfile.template > "${dir}Dockerfile${suffix}"
+  echo "updated ${dir}Dockerfile${suffix}"
+}
+
+# devel updates
+version_variant='-devel'
+make='./make_debian.sh'
+dir=''
+upload_line=''
+for arch in $archs; do
+  replaceTemplate
+done
+
+# release updates
+version_variant=''
+make='./make_all.sh'
+dir='release/'
+upload_line='RUN if [ -n "\$UPLOAD_URL" ] \&\& [ -n "\$UPLOAD_CREDENTIALS" ]; then for img in ebusd-*.deb; do echo "upload \$img"; curl -u "\$UPLOAD_CREDENTIALS" -s -X POST --data-binary "@\$img" -H "Content-Type: application/octet-stream" "\$UPLOAD_URL/\$img?a=\$EBUSD_ARCH\&v=\$EBUSD_VERSION"; done; fi'
+for arch in $archs; do
+  replaceTemplate
+done