[devshell] Upgrade to xenial & add Rust musl target support.

Signed-off-by: Fletcher Nichol <fnichol@nichol.ca>

.dockerignore

@@ -10,6 +10,7 @@ log
 plans
 support
 !support/init.sh
+tmp
 vendor
 www
 *.md

Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:wily
+FROM ubuntu:xenial
 MAINTAINER The Habitat Maintainers <humans@habitat.sh>
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
@@ -14,29 +14,37 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     libssl-dev \
     libczmq-dev \
     man \
+    musl-tools \
     npm \
     pkg-config \
     protobuf-compiler \
     sudo \
     tmux \
     vim \
-    wget \
-  && rm -rf /var/lib/apt/lists/*
+    wget
 
 ENV CARGO_HOME /cargo-cache
 ENV PATH $PATH:$CARGO_HOME/bin:/root/.cargo/bin
 
 ARG HAB_DEPOT_URL
 ENV HAB_DEPOT_URL ${HAB_DEPOT_URL:-}
 
-RUN curl -s https://static.rust-lang.org/rustup.sh | sh -s -- -y && rustc -V
-RUN curl -sSL https://get.docker.io | sh && docker -v
+RUN curl -s https://static.rust-lang.org/rustup.sh | sh -s -- -y \
+  && RUST_VERSION=$(rustc -V | cut -d ' ' -f 2) \
+  && URL=http://static.rust-lang.org/dist/rust-std-${RUST_VERSION}-x86_64-unknown-linux-musl.tar.gz \
+  && mkdir -p /prep/rust-std-musl \
+  && (cd /prep && curl -LO $URL) \
+  && tar xf /prep/$(basename $URL) -C /prep/rust-std-musl --strip-components=1 \
+  && (cd /prep/rust-std-musl && ./install.sh --prefix=$(rustc --print sysroot)) \
+  && rm -rf /prep \
+  && rustc -V
+RUN env -u CARGO_HOME cargo install protobuf && rm -rf /root/.cargo/registry
+
+RUN curl -sSL https://get.docker.io | sh && rm -rf /var/lib/apt/lists/* && docker -v
 RUN ln -snf /usr/bin/nodejs /usr/bin/node && npm install -g docco && echo "docco `docco -V`"
 
 RUN (adduser --system hab || true) && (addgroup --system hab || true)
 
-RUN env -u CARGO_HOME cargo install protobuf && rm -rf /root/.cargo/registry
-
 COPY .delivery/scripts/ssh_wrapper.sh /usr/local/bin
 COPY .delivery/scripts/git_src_checkout.sh /usr/local/bin
 COPY components/studio/install.sh /tmp
@@ -45,7 +53,7 @@ RUN /tmp/install.sh \
   && hab-bpm install core/busybox-static \
   && (cd /tmp && curl -sLO https://s3-us-west-2.amazonaws.com/fnichol-lfs-tools/core-20160423193745.pub) \
   && chmod 755 /init.sh \
-  && rm -f /tmp/install.sh /hab/cache/artifacts/*
+  && rm -rf /tmp/install.sh /hab/cache/artifacts
 
 WORKDIR /src
 # This entrypoint is temporary until origin key download on install is implemented