install-swift.sh

#!/bin/bash

##
# Copyright IBM Corporation 2016,2017,2018
#
# 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 builds the Swift package on Travis CI.
# If running on the OS X platform, homebrew (http://brew.sh/) must be installed
# for this script to work.

# If any commands fail, we want the shell script to exit immediately.
set -e

# Determine SWIFT_SNAPSHOT for build
if [ -z $SWIFT_SNAPSHOT ]; then
  echo ">> No 'SWIFT_SNAPSHOT' set, checking for existing Swift install..."
  if which swift > /dev/null; then
    SWIFT_SNAPSHOT=$(swift --version 2>/dev/null | grep 'Swift version' | sed 's/^.*Swift version \([0-9][0-9\.]*\) .*$/\1/; ')
    echo ">> Use existing swift version: ${SWIFT_SNAPSHOT}"
  else
    echo ">> No 'SWIFT_SNAPSHOT' set and no existing install, checking for .swift-version file..."
    if [ -f "$projectFolder/.swift-version" ]; then
      echo ">> Found .swift-version file."
      SWIFT_SNAPSHOT="$(cat $projectFolder/.swift-version)";
    # Else use default
    else
      echo ">> No swift-version file found, using default value: $DEFAULT_SWIFT"
      SWIFT_SNAPSHOT=$DEFAULT_SWIFT
    fi
  fi
fi

#If SWIFT_SNAPSHOT is a URL then we call the alternative download function
if [[ $SWIFT_SNAPSHOT == https* ]]; then
  # Starts script to install Swift.
    source ${projectFolder}/Package-Builder/${osName}/install_swift_from_url.sh
else
  # reconcile version with naming conventions by prepending "swift-" if nesseccary
  if [[ $SWIFT_SNAPSHOT == *"swift-"* ]]; then
    export SWIFT_SNAPSHOT
  else
    echo ">> Normalizing SWIFT_VERSION from .swift-version file."
    prefix="swift-"
    export SWIFT_SNAPSHOT=$prefix$SWIFT_SNAPSHOT
  fi

  echo ">> SWIFT_SNAPSHOT: $SWIFT_SNAPSHOT"

  if [[ ${SWIFT_SNAPSHOT} =~ ^.*RELEASE.*$ ]]; then
  	SNAPSHOT_TYPE=$(echo "$SWIFT_SNAPSHOT" | tr '[:upper:]' '[:lower:]')
  elif [[ ${SWIFT_SNAPSHOT} =~ ^swift-.*-DEVELOPMENT.*$ ]]; then
        SNAPSHOT_TYPE=${SWIFT_SNAPSHOT%-DEVELOPMENT*}-branch
  elif [[ ${SWIFT_SNAPSHOT} =~ ^.*DEVELOPMENT.*$ ]]; then
	SNAPSHOT_TYPE=development
  else
	SNAPSHOT_TYPE="$(echo "$SWIFT_SNAPSHOT" | tr '[:upper:]' '[:lower:]')-release"
        SWIFT_SNAPSHOT="${SWIFT_SNAPSHOT}-RELEASE"
  fi

  # Swift has to be installed to run commands, if Swift isn't installed, skip checks.
  if [[ $(swift --version) ]]; then
    # Get the version already installed, if any. OS dependant.
    if [[ "$OSTYPE" == "darwin"* ]]; then
      SWIFT_PREINSTALL="swift-$(swift --version | awk '{print $4}')"
    elif [[ "$OSTYPE" == "linux-gnu" ]]; then
      SWIFT_PREINSTALL="swift-$(swift --version | awk '{print $3}')"
    else
      echo "Unsupported OS. Exiting..."
      exit 1
    fi
  fi

  # Checks for if the needed version of swift matches the one already on the system.
  if [[ $SWIFT_PREINSTALL == "" ]]; then
    echo "Swift is not installed."
    source ${projectFolder}/Package-Builder/${osName}/install_swift_binaries.sh
  else
    if [[ ${SWIFT_SNAPSHOT} == ${SWIFT_PREINSTALL} ]]; then
      echo "Required Swift version is already installed, skipping download..."
    elif [[ ${SWIFT_SNAPSHOT} == "${SWIFT_PREINSTALL}-RELEASE" ]]; then
      echo "Required Swift version is already installed, skipping download..."
    else
      # Starts script to install Swift.
      source ${projectFolder}/Package-Builder/${osName}/install_swift_binaries.sh
    fi
  fi
fi

# Output swift version
echo ">> Swift version shown below: "
swift -version
echo