Add pre_build dependency system to move towards #360

Dockerfile

@@ -58,16 +58,19 @@ RUN set -ex \
 
 RUN mkdir -p /usr/unifi \
      /usr/local/unifi/init.d \
-     /usr/unifi/init.d
+     /usr/unifi/init.d \
+     /usr/local/docker
 COPY docker-entrypoint.sh /usr/local/bin/
 COPY docker-healthcheck.sh /usr/local/bin/
 COPY docker-build.sh /usr/local/bin/
 COPY functions /usr/unifi/functions
 COPY import_cert /usr/unifi/init.d/
+COPY pre_build /usr/local/docker/pre_build
 RUN chmod +x /usr/local/bin/docker-entrypoint.sh \
  && chmod +x /usr/unifi/init.d/import_cert \
  && chmod +x /usr/local/bin/docker-healthcheck.sh \
- && chmod +x /usr/local/bin/docker-build.sh
+ && chmod +x /usr/local/bin/docker-build.sh \
+ && chmod -R +x /usr/local/docker/pre_build
 
 # Push installing openjdk-8-jre first, so that the unifi package doesn't pull in openjdk-7-jre as a dependency? Else uncomment and just go with openjdk-7.
 RUN set -ex \

docker-build.sh

@@ -44,6 +44,11 @@ echo "deb [ arch=amd64,arm64 ] http://repo.mongodb.org/apt/ubuntu xenial/mongodb
 apt-get update
 echo "deb http://www.ubnt.com/downloads/unifi/debian unifi5 ubiquiti" > /etc/apt/sources.list.d/20ubiquiti.list
 tryfail apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 06E85760C0A52C50
+
+if [ -d "/usr/local/docker/pre_build/$(dpkg --print-architecture)" ]; then
+    find "/usr/local/docker/pre_build/$(dpkg --print-architecture)" -type f -exec '{}' \;
+fi
+
 curl -L -o ./unifi.deb "${1}"
 apt -qy install mongodb-org ./unifi.deb
 rm -f ./unifi.deb

pre_build/README.md

@@ -0,0 +1,5 @@
+This folder is for adding build scripts for various architectures to apply quick fixes for building on other architectures.
+
+To use you would create a subfolder (ie `armhf`, `amd64`, `arm64`) then place an appropriate shell script in that folder to build.
+
+This directory was added to enable satisfying dependencies that aren't automatically satisfied by the distro (for ex: mongodb on armhf)