Bash script to install Swift 5.2 on Ubuntu 18.04

install-swift.sh

#!/bin/bash

if [ -f "/opt/swift/bin/swift" ]; then
  echo ====== Swift is already installed at /opt/swift, exiting!
  exit 1
fi

for i in "$@"
do
case $i in
    -s|--skip-signature)
    SKIP_SIGNATURE_CHECK=YES
    shift
    ;;
    *)
    ;;
esac
done

echo ====== Installing dependencies...

export DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true

apt-get -qq update

apt-get -qq install -y \
    curl \
    libatomic1 \
    libcurl4 \
    libxml2 \
    libedit2 \
    libsqlite3-0 \
    libc6-dev \
    binutils \
    libgcc-5-dev \
    libstdc++-5-dev \
    zlib1g-dev \
    libpython2.7 \
    tzdata \
    git \
    pkg-config \
    libssl-dev

# pub   4096R/ED3D1561 2019-03-22 [expires: 2021-03-21]
#       Key fingerprint = A62A E125 BBBF BB96 A6E0  42EC 925C C1CC ED3D 1561
# uid                  Swift 5.x Release Signing Key <swift-infrastructure@swift.org
SWIFT_SIGNING_KEY=A62AE125BBBFBB96A6E042EC925CC1CCED3D1561
SWIFT_PLATFORM=ubuntu18.04
SWIFT_BRANCH=swift-5.2.4-release
SWIFT_VERSION=swift-5.2.4-RELEASE
SWIFT_WEBROOT=https://swift.org/builds/

set -e
SWIFT_WEBDIR="$SWIFT_WEBROOT/$SWIFT_BRANCH/$(echo $SWIFT_PLATFORM | tr -d .)/"
SWIFT_BIN_URL="$SWIFT_WEBDIR/$SWIFT_VERSION/$SWIFT_VERSION-$SWIFT_PLATFORM.tar.gz"
SWIFT_SIG_URL="$SWIFT_BIN_URL.sig"
export GNUPGHOME="$(mktemp -d)"

echo ====== Downloading toolchain...

curl -#fSL "$SWIFT_BIN_URL" -o swift.tar.gz "$SWIFT_SIG_URL" -o swift.tar.gz.sig

if [ -n "$SKIP_SIGNATURE_CHECK" ]
then
    echo ====== Skipped signature check!
else
    echo ====== Verifying signature...

    gpg --batch --quiet --keyserver ha.pool.sks-keyservers.net --recv-keys "$SWIFT_SIGNING_KEY"
    gpg --batch --verify swift.tar.gz.sig swift.tar.gz
fi

echo ====== Unpacking toolchain to /opt/swift...

mkdir -p /opt/swift
tar -xzf swift.tar.gz --directory /opt/swift --strip-components=2
chmod -R o+r /opt/swift/lib/swift

echo ====== Cleaning up...

rm -rf "$GNUPGHOME" swift.tar.gz.sig swift.tar.gz

/opt/swift/bin/swift -version
echo
echo ===== $SWIFT_VERSION is now installed. Have a nice day!
echo '      PROTIP: you should add /opt/swift/bin to your PATH.'