#!/bin/bash

## Copyright (C) 2012 - 2020 ENCRYPTED SUPPORT LP <adrelanos@riseup.net>
## See the file COPYING for copying conditions.

set -x
set -e

if command -v qubesdb-read >/dev/null 2>&1 ; then
   qubes_vm_type="$(qubesdb-read /qubes-vm-type)"
fi

cache_folder="/var/cache/anon-base-files"

if [ "$qubes_vm_type" = "TemplateVM" ]; then
   ## Separate done file for Qubes TemplateVMs to make this work with the
   ## current home folder population for Qubes DispVMs.
   ## https://github.com/QubesOS/qubes-core-agent-linux/blob/f380c346cf9af3f058b8ece853d7d4a5ece28815/misc/dispvm-prerun.sh#L6-L12
   done_file="$cache_folder/first-boot-skel.TemplateVM.done"
else
   ## Non-Qubes-Whonix or non-Qubes TemplateVMs
   done_file="$cache_folder/first-boot-skel.done"
fi

if [ -e "$done_file" ]; then
   exit 0
fi

user_name="user"
home_dir="/home/$user_name"

if [ ! -d "$home_dir" ]; then
   exit 0
fi

skel_folder="/etc/skel"

if [ ! -d "$skel_folder" ]; then
   exit 0
fi

pushd "$skel_folder"

mkdir -p "$cache_folder"

shopt -s dotglob
shopt -s nullglob

for fso in ./* ; do
   true "fso: $fso"
   ## Technically below for 'cp' it would also be possible to use '$fso' rather
   ## than '$fso_basename', but the latter produces a prettier xtrace.
   fso_basename="${fso##*/}"
   if [ ".bashrc" = "$fso_basename" ]; then
      ## We do not need /home/user/.bashrc.
      ## /home/user/.bashrc is handled below.
      continue
   fi
   if [ ".bashrc.whonix" = "$fso_basename" ]; then
      ## We do not need /home/user/.bashrc.whonix.
      ## /home/user/.bashrc is handled below.
      continue
   fi
   if [ ".bashrc.whonix-orig" = "$fso_basename" ]; then
      ## We do not need /home/user/.bashrc.whonix-orig.
      ## /home/user/.bashrc is handled below.
      continue
   fi
   if [ -d "$fso" ]; then
      true "folder: yes"
      cp --verbose --no-clobber --archive --parents --recursive "$fso_basename" "$home_dir"
      chown --changes --recursive "$user_name:$user_name" "$home_dir/$fso_basename"
   else
      true "folder: no"
      ## Require '--dereference' otherwise the 'chown' below could fail.
      cp --verbose --no-clobber --archive --dereference "$fso_basename" "$home_dir"
      chown --changes "$user_name:$user_name" "$home_dir/$fso_basename"
   fi
done

if [ ! -f "$skel_folder/.bashrc.whonix-orig" ]; then
   touch "$done_file"
   exit 0
fi
if [ ! -f "$skel_folder/.bashrc.whonix" ]; then
   touch "$done_file"
   exit 0
fi
if [ ! -f "$skel_folder/.bashrc" ]; then
   touch "$done_file"
   exit 0
fi

if diff "$skel_folder/.bashrc.whonix" "$home_dir/.bashrc" >/dev/null ; then
   ## no diff found
   true "Already using Whonix $skel_folder/.bashrc.whonix. No need to copy $skel_folder/.bashrc.whonix."
   touch "$done_file"
   exit 0
fi

if diff "$skel_folder/.bashrc.whonix-orig" "$home_dir/.bashrc" >/dev/null ; then
   ## no diff found
   true "Overwriting default $home_dir/.bashrc ( which matches $skel_folder/.bashrc.whonix-orig ) with $skel_folder/.bashrc.whonix."
   cp --verbose --archive "$skel_folder/.bashrc.whonix" "$home_dir/.bashrc"
   chown --changes "$user_name:$user_name" "$home_dir/.bashrc"
else
   ## a diff was found
   true "User customized $home_dir/.bashrc. Keeping it."
fi

touch "$done_file"
