install.sh

#!/bin/bash
set -e

DEST="$HOME/"
# config destination for programs that resolves home by UID (SSH -.-")
# Linux
if command -v getent &> /dev/null
then
  DEST_UID="$(zsh -c "echo ~$(getent passwd "$UID" | cut -d: -f1)")"
# system without getent (macOS)
else
  DEST_UID="$HOME"
fi

# paths which will be only copied once (NOT symlinked!)
is_oneshot()
{
  [ "$1" = "./uid/.ssh/config.real" ] || [ "$1" = "./uid/.ssh/config" ]
}

# get a specific replacement for the given file
get_drop_in()
{
  # Private IServ configuration
  if [ -x /usr/sbin/iservchk ] && [ -f "./iserv-private/$1" ] && [[ "$(hostname -f)" =~ \.?(felix\.test-iserv\.de|jacobi-(bs\.de|hamburg\.net)|stsbl\.de|felix\.iserv\.dev)$ ]]
  then
    realpath -m "$PWD/iserv-private/$1"
    return
  fi

  # IServ configuration for root
  if [ "$EUID" = "0" ] && [ "$USER" = "root" ] && [ -x /usr/sbin/iservchk ] && [ -f "./iserv-root/$1" ]
  then
    realpath -m "$PWD/iserv-root/$1"
    return
  fi

  # IServ configuration
  if [ -x /usr/sbin/iservchk ] && [ -f "./iserv/$1" ]
  then
    realpath -m "$PWD/iserv/$1"
    return
  fi

  # Work PC/VM
  if ! uname -a | grep -q Darwin
  then
    if ([[ "$(hostname -f)" =~ (|\.)iserv.eu$ ]] || [[ "$(hostname -f)" =~ \.?(mein-iserv\.de|i\.local)$ ]]) &&
	[ -f "./work/$1" ]
    then
      realpath -m "$PWD/work/$1"
      return
    fi
  fi

  echo "$2"
}

install_file()
{
  rf="$1"
  rd="$2"

  if ! { [[ $rd =~ .config/autostart ]] || [[ $rd =~ .local/share/applications ]]; }
  then
    if [ "$(readlink -f "$rd")" = "$rf" ]
    then
      return
    elif [ -L "$rd" ]
    then
      echo "Replacing existing symlink $rd with one to $rf."
      ln -sf "$rf" "$rd"
      return
    fi
  fi

  mkdir -pv "$(dirname "$rd")"

  if ! [ -e "$rd" ]
  then
    if [[ $rd =~ .config/autostart ]] || [[ $rd =~ .local/share/applications ]]
    then
      echo "Copying $rf to $rd."
      cp -a "$rf" "$rd"
    else
      echo "Creating new symlink $rd to $rf."
      ln -sf "$rf" "$rd"
    fi
    return
  fi

  if [[ $rd =~ .config/autostart ]] || [[ $rd =~ .local/share/applications ]]
  then
    if diff -u "$DEST/$f" "$rf"
    then
      # same file
      true
    else
      echo "$rd is a real file. Difference with $rf:"
      diff -u "$DEST/$f" "$rd" || true
      replace=n

      echo -n "Do you want to replace it? (y/N) "
      read replace

      if [ "$replace" = "y" ] || [ "$replace" = "Y" ]
      then
	echo "Replacing file $rd with copy of $rf."
        rm -f "$DEST/$f"
        cp -a "$rf" "$DEST/$f"
	return
      fi
    fi
  else
    echo "$rd is a real file. Difference with $rf:"
    diff -u "$DEST/$f" "$rf" || true
    replace=n

    echo -n "Do you want to replace it? (y/N) "
    read replace

    if [ "$replace" = "y" ] || [ "$replace" = "Y" ]
    then
      echo "Replacing file $rd with symlink to $rf."
      ln -sf "$rf" "$rd"
      return
    fi
  fi
}

for f in $(find -type f -not \( -path './uid/*' -or -path './.git/*' -or \
               -path './install.sh' -or -path './README.md' -or \
               -path './LICENSE' -or -path './iserv/*' -or \
               -path './iserv-root/*' -or -path './work/*' \)
)
do
  rf="$(realpath -sm "$f")"
  rd="$(realpath -sm "$DEST/$f")"

  install_file "$(get_drop_in "$f" "$rf")" "$rd"
done

for f in $(find -type f -path './uid/*')
do
  rf="$(realpath -sm "$f")"
  rd="$(realpath -sm "$DEST_UID/$(echo $f | sed -E 's#^\./uid##g')")"

  if is_oneshot "$f"
  then
    if [ ! -e "$rd" ]
    then
        cp -av "$(get_drop_in "$f" "$rf")" "$rd"
    fi

    continue
  fi

  install_file "$(get_drop_in "$f" "$rf")" "$rd"
done

if command -v php &> /dev/null && ! command -v phive &> /dev/null
then
  ~/bin/install-phive
fi

if command -v phive &> /dev/null
then
  (cd ~/bin; phive install) || true
fi

if ! [ -d ~/git/ssh_config ]
then
  echo "Cloning SSH config..."
  mkdir -p ~/git
  git clone git@git.jacobi-bs.de:cfg/ssh_config.git ~/git/ssh_config
  echo "Done."
fi

echo "Pulling SSH config..."
git -C ~/git/ssh_config pull
echo "Done."

echo "Installing SSH config..."
(cd ~/git/ssh_config; make install)
echo "Installed."