docker: Make the pi-user bash config more realistic

Basic bash configs taken from a RetroPie 4.5.1 on a RaspberryPi 3. They
are copied over when creating a new user. See:
https://www.raspberrypi.org/documentation/linux/usage/users.md

.dockerignore

@@ -1 +1,2 @@
 *
+!docker/

Dockerfile

@@ -10,6 +10,13 @@ RUN apt-get update \
     # Required to run image as non-root user
     sudo
 
+# skel files are used as the basis for new users and include .bashrc etc:
+# https://www.raspberrypi.org/documentation/linux/usage/users.md
+# These files were copied from a RetroPie 4.5.1 on a RaspberryPi 3 and
+# are included to make the image more realistic. One difference from
+# base docker image is that .bashrc has colors enabled.
+COPY docker/rpi/etc/skel /etc/skel
+
 # Mimic RaspberryPi: Create a user called "pi" without a password that's in the groups pi and sudo
 # Use `adduser` instead of `useradd`:
 # * https://github.com/RetroPie/RetroPie-Setup/issues/2165#issuecomment-337932294

docker/rpi/etc/skel/.bash_logout

@@ -0,0 +1,7 @@
+# ~/.bash_logout: executed by bash(1) when login shell exits.
+
+# when leaving the console clear the screen to increase privacy
+
+if [ "$SHLVL" = 1 ]; then
+    [ -x /usr/bin/clear_console ] && /usr/bin/clear_console -q
+fi

docker/rpi/etc/skel/.bashrc

@@ -0,0 +1,113 @@
+# ~/.bashrc: executed by bash(1) for non-login shells.
+# see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)
+# for examples
+
+# If not running interactively, don't do anything
+case $- in
+    *i*) ;;
+      *) return;;
+esac
+
+# don't put duplicate lines or lines starting with space in the history.
+# See bash(1) for more options
+HISTCONTROL=ignoreboth
+
+# append to the history file, don't overwrite it
+shopt -s histappend
+
+# for setting history length see HISTSIZE and HISTFILESIZE in bash(1)
+HISTSIZE=1000
+HISTFILESIZE=2000
+
+# check the window size after each command and, if necessary,
+# update the values of LINES and COLUMNS.
+shopt -s checkwinsize
+
+# If set, the pattern "**" used in a pathname expansion context will
+# match all files and zero or more directories and subdirectories.
+#shopt -s globstar
+
+# make less more friendly for non-text input files, see lesspipe(1)
+#[ -x /usr/bin/lesspipe ] && eval "$(SHELL=/bin/sh lesspipe)"
+
+# set variable identifying the chroot you work in (used in the prompt below)
+if [ -z "${debian_chroot:-}" ] && [ -r /etc/debian_chroot ]; then
+    debian_chroot=$(cat /etc/debian_chroot)
+fi
+
+# set a fancy prompt (non-color, unless we know we "want" color)
+case "$TERM" in
+    xterm-color|*-256color) color_prompt=yes;;
+esac
+
+# uncomment for a colored prompt, if the terminal has the capability; turned
+# off by default to not distract the user: the focus in a terminal window
+# should be on the output of commands, not on the prompt
+force_color_prompt=yes
+
+if [ -n "$force_color_prompt" ]; then
+    if [ -x /usr/bin/tput ] && tput setaf 1 >&/dev/null; then
+	# We have color support; assume it's compliant with Ecma-48
+	# (ISO/IEC-6429). (Lack of such support is extremely rare, and such
+	# a case would tend to support setf rather than setaf.)
+	color_prompt=yes
+    else
+	color_prompt=
+    fi
+fi
+
+if [ "$color_prompt" = yes ]; then
+    PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w \$\[\033[00m\] '
+else
+    PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '
+fi
+unset color_prompt force_color_prompt
+
+# If this is an xterm set the title to user@host:dir
+case "$TERM" in
+xterm*|rxvt*)
+    PS1="\[\e]0;${debian_chroot:+($debian_chroot)}\u@\h: \w\a\]$PS1"
+    ;;
+*)
+    ;;
+esac
+
+# enable color support of ls and also add handy aliases
+if [ -x /usr/bin/dircolors ]; then
+    test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval "$(dircolors -b)"
+    alias ls='ls --color=auto'
+    #alias dir='dir --color=auto'
+    #alias vdir='vdir --color=auto'
+
+    alias grep='grep --color=auto'
+    alias fgrep='fgrep --color=auto'
+    alias egrep='egrep --color=auto'
+fi
+
+# colored GCC warnings and errors
+#export GCC_COLORS='error=01;31:warning=01;35:note=01;36:caret=01;32:locus=01:quote=01'
+
+# some more ls aliases
+#alias ll='ls -l'
+#alias la='ls -A'
+#alias l='ls -CF'
+
+# Alias definitions.
+# You may want to put all your additions into a separate file like
+# ~/.bash_aliases, instead of adding them here directly.
+# See /usr/share/doc/bash-doc/examples in the bash-doc package.
+
+if [ -f ~/.bash_aliases ]; then
+    . ~/.bash_aliases
+fi
+
+# enable programmable completion features (you don't need to enable
+# this, if it's already enabled in /etc/bash.bashrc and /etc/profile
+# sources /etc/bash.bashrc).
+if ! shopt -oq posix; then
+  if [ -f /usr/share/bash-completion/bash_completion ]; then
+    . /usr/share/bash-completion/bash_completion
+  elif [ -f /etc/bash_completion ]; then
+    . /etc/bash_completion
+  fi
+fi

docker/rpi/etc/skel/.profile

@@ -0,0 +1,22 @@
+# ~/.profile: executed by the command interpreter for login shells.
+# This file is not read by bash(1), if ~/.bash_profile or ~/.bash_login
+# exists.
+# see /usr/share/doc/bash/examples/startup-files for examples.
+# the files are located in the bash-doc package.
+
+# the default umask is set in /etc/profile; for setting the umask
+# for ssh logins, install and configure the libpam-umask package.
+#umask 022
+
+# if running bash
+if [ -n "$BASH_VERSION" ]; then
+    # include .bashrc if it exists
+    if [ -f "$HOME/.bashrc" ]; then
+	. "$HOME/.bashrc"
+    fi
+fi
+
+# set PATH so it includes user's private bin if it exists
+if [ -d "$HOME/bin" ] ; then
+    PATH="$HOME/bin:$PATH"
+fi