post_install.template

#!/usr/bin/env bash

# Copyright (c) YugaByte, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
# in compliance with the License.  You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software distributed under the License
# is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
# or implied.  See the License for the specific language governing permissions and limitations
# under the License.
#
# This script replaces patches files and links in Homebrew/Linuxbrew installation. It replaces path
# where Homebrew/Linuxbrew was originally built with new path of the same length. In order to keep
# the path length the same we are creating symlink of required length to current Homebrew/Linuxbrew
# directory.

set -euo pipefail

. "${0%/*}/brew-common.sh"

readonly script_dir=$( cd "$( dirname "$0" )" && pwd )
if [[ ! -x $script_dir/bin/brew ]]; then
  fatal "This script should be located inside Homebrew/Linuxbrew directory."
fi

# This is inserted at Homebrew/Linuxbrew build time.
readonly orig_brew_home="{{ orig_brew_home }}"
declare -i -r ORIG_LEN=${#orig_brew_home}

brew_home=$script_dir
cd "$brew_home"
LEN=${#brew_home}
if [[ $LEN -gt $ORIG_LEN ]]; then
  fatal "Homebrew/Linuxbrew absolute path should be no more than $ORIG_LEN bytes, but actual" \
        "length is $LEN bytes: $brew_home"
fi

get_fixed_length_path "$brew_home" "$ORIG_LEN"
readonly brew_final_path=$fixed_length_path
declare -i -r final_path_len=${#brew_final_path}
if [[ $final_path_len != $ORIG_LEN ]]; then
  fatal "Homebrew/Linuxbrew should be linked to a directory having absolute path length of" \
        "$ORIG_LEN bytes, but actual length is $final_path_len bytes: $brew_final_path"
fi

if [[ $brew_home != $brew_final_path ]]; then
  if [[ -e $brew_final_path ]]; then
    fatal "Fixed-length path '$brew_final_path' already exists"
  fi
  # Make the real directory be the fixed-length path, and the old name would be a link to it.
  cd /
  mv "$brew_home" "$brew_final_path"
  create_symlink "$brew_final_path" "$brew_home"
  cd "$brew_final_path"
fi

orig_brew_home_escaped=$(get_escaped_sed_re "$orig_brew_home")
brew_final_path_escaped=$(get_escaped_sed_replacement_str "$brew_final_path")

cat FILES_TO_PATCH | while read f
do
  sed -i --binary "s/$orig_brew_home_escaped/$brew_final_path_escaped/g" "$f"
done

cat LINKS_TO_PATCH | while read f
do
  target=$(readlink "$f")
  target="${target/$orig_brew_home/$brew_final_path}"
  create_symlink "$target" "$f"
done