Add all the assignment code.

Signed-off-by: jmug <u.g.a.mariano@gmail.com>

hw2/.devcontainer/.zshrc

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+autoload -U colors && colors
+precmd() {
+   drawline=""
+   for i in {1..$COLUMNS}; drawline=" $drawline"
+   drawline="%U${drawline}%u"
+   PS1="%F{252}${drawline}
+%B%F{124}%n:%~>%b%f "
+}
+
+eval $(opam env)
+
+alias ls="ls --color"
+

hw2/.devcontainer/Dockerfile

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+FROM ubuntu:20.04
+
+## BEGIN: RUNS AS ROOT
+
+# Create a user
+
+ARG USERNAME=cis3410
+ARG USER_UID=1000
+ARG USER_GID=$USER_UID
+
+ENV TZ='Asia/Shanghai'
+# !!![zjy] apt change ustc source
+RUN apt-get update -y\
+    && apt-get install -y --no-install-recommends \
+    apt-transport-https \
+    ca-certificates \
+    tzdata \
+    && sed -i "s@http://.*.ubuntu.com@https://mirrors.ustc.edu.cn@g" /etc/apt/sources.list \
+    && rm -rf /var/apt/cache/*
+
+RUN groupadd --gid $USER_GID $USERNAME \
+    #
+    # [Optional] Add sudo support. Omit if you don't need to install software after connecting.
+    && apt-get update -y \
+    && apt-get install -y sudo \
+    && echo $USERNAME ALL=\(root\) NOPASSWD:ALL > /etc/sudoers.d/$USERNAME \
+    && chmod 0440 /etc/sudoers.d/$USERNAME
+
+## Hack needs root permissions
+
+# See hack.sh
+COPY hack.sh /tmp/hack.sh
+RUN chmod +x /tmp/hack.sh
+RUN /tmp/hack.sh
+
+RUN apt-get update -y
+RUN apt-get install -y build-essential
+RUN apt-get install -y m4
+RUN apt-get install -y opam
+RUN apt-get install -y clang
+RUN apt-get install -y time
+RUN apt-get install -y zip
+# !!![zjy] install zsh first then set user
+RUN apt-get install -y zsh
+
+# !!![zjy] install zsh first then set user
+RUN useradd --uid $USER_UID --gid $USER_GID -m $USERNAME --shell /bin/zsh 
+
+## Set up user environmnent
+COPY .zshrc /home/$USERNAME/
+RUN chown $USERNAME /home/$USERNAME/.zshrc
+
+## Run in usermode
+
+# [Optional] Set the default user. Omit if you want to keep the default as root.
+USER $USERNAME
+
+RUN mkdir -p /home/$USERNAME/.local/state/
+RUN touch /home/$USERNAME/.local/state/utop-history
+
+# Configure opam/ocaml
+# !!![zjy] change default repo to github (SJTU repo is failed)
+RUN opam init --yes --disable-sandboxing default https://github.com/ocaml/opam-repository.git
+RUN opam switch create 4.14.1 ocaml-base-compiler.4.14.1
+RUN opam switch 4.14.1
+RUN opam install -y dune
+RUN opam install -y num
+RUN opam install -y menhir
+RUN opam install -y utop
+RUN opam install -y ocamlformat
+RUN opam install -y ocaml-lsp-server
+RUN eval `opam config env`
+

hw2/.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/ubuntu
+{
+	"name": "Ubuntu",
+	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+	"build": { 
+		"dockerfile": "Dockerfile"
+	},
+	
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	// "features": {},
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// "postCreateCommand": "uname -a",
+
+	// Configure tool-specific properties.
+	"customizations": {
+		"vscode": {
+			"extensions": [
+			    "ocamllabs.ocaml-platform",
+			    "allanblanchard.ocp-indent"
+			]
+		}
+	}
+
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "root"
+}

hw2/.devcontainer/hack.sh

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+#!/usr/bin/env bash
+
+### HACK - workaround ubuntu libc6 version number bug see: https://forum.odroid.com/viewtopic.php?p=344373
+
+mv /bin/uname /bin/uname.orig
+tee -a /bin/uname <<EOF
+#!/bin/bash
+if [[ \$1 == "-r" ]]; then
+echo '4.9.250';
+exit
+else
+uname.orig \$1
+fi
+EOF
+
+chmod 755 /bin/uname
+### END HACK