Docker: Add a Dockerfile and Makefile targets (#373)

* add docker build option

* add docker section in makefile

* add bash_aliases to get different prompt

docker/.bash_aliases

@@ -0,0 +1 @@
+PS1="\[\e]0;\u@\h: \w\a\]${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[1;35m\]<$IMAGE_NAME>\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ "

docker/Dockerfile

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+FROM rustlang/rust:nightly
+
+ENV IMAGE_NAME=blog_os-docker
+
+RUN apt-get update && \
+    apt-get install -q -y --no-install-recommends \
+    nasm \
+    binutils \
+    grub-common \
+    xorriso \
+    grub-pc-bin && \
+    apt-get autoremove -q -y && \
+    apt-get clean -q -y && \
+    rm -rf /var/lib/apt/lists/* && \
+    cargo install xargo && \
+    rustup component add rust-src
+
+ENV GOSU_VERSION 1.10
+
+RUN set -ex; \
+	\
+	fetchDeps=' \
+		ca-certificates \
+		wget \
+	'; \
+	apt-get update; \
+	apt-get install -y --no-install-recommends $fetchDeps; \
+	rm -rf /var/lib/apt/lists/*; \
+	\
+	dpkgArch="$(dpkg --print-architecture | awk -F- '{ print $NF }')"; \
+	wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch"; \
+	chmod +x /usr/local/bin/gosu; \
+# verify that the binary works
+	gosu nobody true; 
+
+COPY entrypoint.sh /usr/local/bin/
+COPY .bash_aliases /etc/skel/
+
+ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]
+CMD ["/bin/bash"]

docker/README.md

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+# Building Blog OS using Docker
+Inspired by [redox].
+You just need `git`, `make`, and `docker`.
+It is beter to use a non-privileged user to run the `docker` command, which is usually achieved by adding the user to the `docker` group.
+
+## Run the container to build Blog OS
+You can build the docker image using `make docker_build` and run it using `make docker_run`.
+
+## Run the container interactively
+You can use the `make` target `docker_interactive` to get a shell in the container.
+
+## Clear the toolchain caches (Cargo & Rustup)
+To clean the docker volumes used by the toolchain, you just need to run `make docker_clean`.
+
+[redox]: https://github.com/redox-os/redox
+
+## License
+The source code is dual-licensed under MIT or the Apache License (Version 2.0). This excludes the `blog` directory.

docker/entrypoint.sh

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+#!/bin/sh
+USER_NAME=blogos
+USER_UID=${LOCAL_UID:-9001}
+USER_GID=${LOCAL_GID:-9001}
+
+groupadd --non-unique --gid $USER_GID $USER_NAME
+useradd --non-unique --create-home --uid $USER_UID --gid $USER_GID $USER_NAME
+
+export HOME=/home/$USER_NAME
+
+TESTFILE=$RUSTUP_HOME/settings.toml
+CACHED_UID=$(stat -c "%u" $TESTFILE)
+CACHED_GID=$(stat -c "%g" $TESTFILE)
+
+if [ $CACHED_UID != $USER_UID  ] || [ $USER_GID != $CACHED_GID  ]; then
+    chown $USER_UID:$USER_GID -R $CARGO_HOME $RUSTUP_HOME
+fi
+
+exec gosu $USER_NAME "$@"