homebrew-bootstrap/cmd/brew-bootstrap-rbenv-ruby at master · github/homebrew-bootstrap · GitHub

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#!/bin/bash
#:  `Usage: brew bootstrap-rbenv-ruby` [--debug]
#:
#:  Installs Ruby and Bundler.
set -e

if [ "$1" = "--debug" ]; then
  shift
  PRINT_DEBUG="1"
  set -x
fi

warn() { echo "$@" >&2; }
abort() { EXPECTED_EXIT="1"; warn "$@"; exit 1; }

abort_for_sh() {
  abort 'Error: add `eval "$(rbenv init -)"` to the end of your .bash_profile!'
}

abort_for_zsh() {
  abort 'Error: add `eval "$(rbenv init -)"` to the end of your .zshrc!'
}

abort_for_fish() {
  abort 'Error: add `status --is-interactive; and . (rbenv init -|psub)` to the end of your .config/fish/config.fish!'
}

abort_with_shell_setup_message() {
  case $(basename ${SHELL:-bash}) in
  sh|bash)
    abort_for_sh
    ;;
  zsh)
    abort_for_zsh
    ;;
  fish)
    abort_for_fish
    ;;
  # tcsh users are on their own
  *)
    abort 'Error: you must finish setting up rbenv in your shell; check `rbenv init` for instructions!'
  esac
}

cleanup() {
  set +e
  if [ -n "$EXPECTED_EXIT" ]; then
    return
  fi
  warn "Error: $(basename $0) failed!"
  if [ -z "$PRINT_DEBUG" ]; then
    warn "For debugging output run:"
    warn "  $0 --debug"
    warn "If you're stuck: file an issue with debugging output at:"
    warn "  https://github.com/github/homebrew-bootstrap/issues/new"
  fi
}
trap "cleanup" EXIT

BASE_PATH="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"

if ! which rbenv &>/dev/null; then
  abort "Error: you need to 'brew install rbenv'!"
fi

if ! rbenv version-name &>/dev/null; then
  if ! [[ -z "$RBENV_VERSION" ]]; then
    RUBY_REQUESTED="$RBENV_VERSION"
  else
    RUBY_REQUESTED="$(rbenv local)"
  fi
  RUBY_DEFINITION="$(ruby-build --definitions | grep "^$RUBY_REQUESTED$" || true)"

  if [ -z "$RUBY_DEFINITION" ]; then
    RUBY_DEFINITION="$BASE_PATH/ruby-definitions/$RUBY_REQUESTED"

    if ! [ -f "$RUBY_DEFINITION" ]; then
      warn  "Error: cannot find Ruby $RUBY_REQUESTED definition in ruby-build or at:"
      abort "$RUBY_DEFINITION"
    fi
  fi

  # use workaround for necessary for some Ruby versions
  # https://github.com/ffi/ffi/issues/869#issuecomment-752123090
  if [ "$(uname -sm)" = "Darwin arm64" ]; then
    export RUBY_CFLAGS=-DUSE_FFI_CLOSURE_ALLOC
  fi
  rbenv install --skip-existing "$RUBY_DEFINITION"
fi

if [ "$(rbenv exec ruby --version)" != "$(ruby --version)" ]; then
  abort_with_shell_setup_message
fi

(rbenv which bundle &>/dev/null && bundle -v &>/dev/null) || {
  # Bundler 2 doesn't support Ruby 2.x or below, but
  # Rubygems won't automatically pick a compatible Bundler for us. Boo!
  if [[ "$RUBY_REQUESTED" < "2.3" ]]; then
    gem install bundler -v '<2'
  else
    gem install bundler
  fi

  rbenv rehash
}

EXPECTED_EXIT="1"
exit 0