docker: add debian Ports base image

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

tests/docker/dockerfiles/debian-ports.docker

@@ -0,0 +1,35 @@
+#
+# Docker multiarch cross-compiler target
+#
+# This docker target is builds on Debian Ports cross compiler targets
+# to build distro with a selection of cross compilers for building test binaries.
+#
+# On its own you can't build much but the docker-foo-cross targets
+# build on top of the base debian image.
+#
+FROM debian:unstable
+
+MAINTAINER Philippe Mathieu-Daudé <f4bug@amsat.org>
+
+RUN echo "deb [arch=amd64] http://deb.debian.org/debian unstable main" > /etc/apt/sources.list
+
+# Duplicate deb line as deb-src
+RUN cat /etc/apt/sources.list | sed -ne "s/^deb\ \(\[.*\]\ \)\?\(.*\)/deb-src \2/p" >> /etc/apt/sources.list
+
+# Setup some basic tools we need
+RUN apt-get update && \
+    DEBIAN_FRONTEND=noninteractive apt-get install -yy eatmydata
+RUN DEBIAN_FRONTEND=noninteractive eatmydata \
+    apt-get install -y --no-install-recommends \
+        bison \
+        build-essential \
+        ca-certificates \
+        clang \
+        debian-ports-archive-keyring \
+        flex \
+        git \
+        pkg-config \
+        psmisc \
+        python \
+        texinfo \
+        $(apt-get -s build-dep qemu | egrep ^Inst | fgrep '[all]' | cut -d\  -f2)