Add a local dockerfile variant.

Add a local dockerfile variant that allows creating an image from a
local .deb package.

docker/local/Dockerfile

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+FROM debian:unstable
+
+MAINTAINER Sysdig <support@sysdig.com>
+
+ENV FALCO_VERSION 0.1.1dev
+
+LABEL RUN="docker run -i -t -v /var/run/docker.sock:/host/var/run/docker.sock -v /dev:/host/dev -v /proc:/host/proc:ro -v /boot:/host/boot:ro -v /lib/modules:/host/lib/modules:ro -v /usr:/host/usr:ro --name NAME IMAGE"
+
+ENV SYSDIG_HOST_ROOT /host
+
+ENV HOME /root
+
+RUN cp /etc/skel/.bashrc /root && cp /etc/skel/.profile /root
+
+ADD http://download.draios.com/apt-draios-priority /etc/apt/preferences.d/
+
+RUN echo "deb http://httpredir.debian.org/debian jessie main" > /etc/apt/sources.list.d/jessie.list
+RUN apt-get update
+RUN apt-get install -y --no-install-recommends \
+	bash-completion \
+	curl \
+	jq \
+	gnupg2 \
+	ca-certificates \
+	gcc \
+	gcc-5 \
+	gcc-4.9 \
+	sysdig
+RUN rm -rf /var/lib/apt/lists/*
+
+# Since our base Debian image ships with GCC 5.0 which breaks older kernels, revert the
+# default to gcc-4.9. Also, since some customers use some very old distributions whose kernel
+# makefile is hardcoded for gcc-4.6 or so (e.g. Debian Wheezy), we pretend to have gcc 4.6/4.7
+# by symlinking it to 4.9
+
+RUN rm -rf /usr/bin/gcc \
+ && ln -s /usr/bin/gcc-4.9 /usr/bin/gcc \
+ && ln -s /usr/bin/gcc-4.9 /usr/bin/gcc-4.8 \
+ && ln -s /usr/bin/gcc-4.9 /usr/bin/gcc-4.7 \
+ && ln -s /usr/bin/gcc-4.9 /usr/bin/gcc-4.6
+
+RUN ln -s $SYSDIG_HOST_ROOT/lib/modules /lib/modules
+
+ADD falco-${FALCO_VERSION}-x86_64.deb /
+RUN dpkg -i /falco-${FALCO_VERSION}-x86_64.deb
+
+COPY ./docker-entrypoint.sh /
+
+ENTRYPOINT ["/docker-entrypoint.sh"]
+
+CMD ["/usr/bin/falco"]

docker/local/docker-entrypoint.sh

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+#!/bin/bash
+#set -e
+
+# Set the SYSDIG_SKIP_LOAD variable to skip loading the sysdig kernel module
+
+if [[ -z "${SYSDIG_SKIP_LOAD}" ]]; then
+    echo "* Setting up /usr/src links from host"
+
+    for i in $(ls $SYSDIG_HOST_ROOT/usr/src)
+    do
+        ln -s $SYSDIG_HOST_ROOT/usr/src/$i /usr/src/$i
+    done
+
+    /usr/bin/sysdig-probe-loader
+fi
+
+exec "$@"