build: refactor docker builds

Signed-off-by: nachoparker <nacho@ownyourbits.com>

2 files changed, 65 insertions, 3 deletions

diff --git a/docker/debian-ncp/Dockerfile b/docker/debian-ncp/Dockerfile
index 0345eb45..3d4e68bf 100644
--- a/docker/debian-ncp/Dockerfile
+++ b/docker/debian-ncp/Dockerfile
@@ -1,9 +1,19 @@
-FROM debian:stretch-slim
+ARG arch=armhf
+ARG arch_qemu=arm
+FROM debian:stretch-slim AS qemu
 
-MAINTAINER Ignacio Núñez Hernanz <nacho@ownyourbits.com>
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends qemu-user-static
+
+FROM ${arch}/debian:stretch-slim
+
+ARG arch_qemu
+
+LABEL maintainer="Ignacio Núñez Hernanz <nacho@ownyourbits.com>"
 
 CMD /bin/bash
 
+COPY --from=qemu /usr/bin/qemu-${arch_qemu}-static /usr/bin/
+
 RUN mkdir -p /etc/services-available.d  /etc/services-enabled.d
 
-COPY docker-common/debian-ncp/run-parts.sh /
+COPY docker/debian-ncp/run-parts.sh /
diff --git a/docker/debian-ncp/run-parts.sh b/docker/debian-ncp/run-parts.sh
new file mode 100755
index 00000000..6ae2c4e0
--- /dev/null
+++ b/docker/debian-ncp/run-parts.sh
@@ -0,0 +1,52 @@
+#!/bin/bash
+
+cleanup()
+{
+  for file in $( ls -1rv /etc/services-enabled.d ); do
+    /etc/services-enabled.d/"$file" stop "$1"
+  done
+  exit
+}
+
+trap cleanup SIGTERM
+
+# if an empty volume is mounted to /data, pre-populate it
+[[ $( ls -1A /data | wc -l ) -eq 0 ]] && { echo "Initializing empty volume.."; cp -raT /data-ro /data; }
+
+# wrapper to simulate update-rc.d
+cat > /usr/local/sbin/update-rc.d <<'EOF'
+#!/bin/bash
+FILE=/etc/services-available.d/???"$1"
+
+test -f $FILE || {
+  echo "$1 doesn't exist"
+  exit 0
+}
+
+[[ "$2" == "enable" ]] && {
+  ln -sf $FILE /etc/services-enabled.d/$( basename $FILE )
+  echo "enabled $1"
+  exit 0
+}
+
+[[ "$2" == "disable" ]] && {
+  rm -f /etc/services-enabled.d/$( basename $FILE )
+  echo "disabled $1"
+  exit 0
+}
+EOF
+chmod +x /usr/local/sbin/update-rc.d
+
+# Iterate only over 000* entries which might setup environment
+for file in $( ls -1v /etc/services-enabled.d | grep ^000.* ); do
+  /etc/services-enabled.d/"$file" start "$1"
+done
+
+# Iterate over remaining entries
+for file in $( ls -1v /etc/services-enabled.d | grep -v ^000.* ); do
+  /etc/services-enabled.d/"$file" start "$1"
+done
+
+# wait for trap from 'docker stop'
+echo "Init done"
+while true; do sleep 0.5; done