install_caddy.sh

#!/usr/bin/env bash
#
#                  Caddy Installer Script
#
#   Homepage: https://caddyserver.com
#   Issues:   https://github.com/caddyserver/caddyserver.com/issues
#   Requires: curl or wget, tar or unzip
#
# Hello! This is an experimental script that installs Caddy
# into your PATH (which may require password authorization).
# Use it like this:
#
#	$ curl https://getcaddy.com | bash
#	 or
#	$ wget -qO- https://getcaddy.com | bash
#
# In automated environments, you may want to run as root.
# If using curl, we recommend using the -fsSL flags.
#
# If you want to get Caddy with extra features, use -s with a
# comma-separated list of directives, like this:
#
#	$ curl https://getcaddy.com | bash -s git,mailout
#
# This should work on Mac, Linux, and BSD systems, and
# hopefully Windows with Cygwin. Please open an issue if
# you notice any bugs.
#
set -e


install_caddy()
{
	CADDY_OS="unsupported"
	CADDY_ARCH="unknown"
	CADDY_ARM=""
	CADDY_FEATURES="$1"

	# Not every platform has or needs sudo (see issue #40)
	[[ $EUID -ne 0 ]] && SUDO_CMD="sudo"


	#########################
	# Which OS and version? #
	#########################

	CADDY_BIN="caddy"
	CADDY_DL_EXT=".tar.gz"

	# NOTE `uname -m` is more accurate than `arch`
	# See: https://en.wikipedia.org/wiki/Uname
	if [ -n "$(uname -m | grep 64)" ]; then
		CADDY_ARCH="amd64"
	elif [ -n "$(uname -m | grep 86)" ]; then
		CADDY_ARCH="386"
	elif [ -n "$(uname -m | grep armv5)" ]; then
		CADDY_ARCH="arm"
		CADDY_ARM="5"
	elif [ -n "$(uname -m | grep armv6l)" ]; then
		CADDY_ARCH="arm"
		CADDY_ARM="6"
	elif [ -n "$(uname -m | grep armv7l)" ]; then
		CADDY_ARCH="arm"
		CADDY_ARM="7"
	else
		echo "unsupported or unknown architecture"
		exit 1
	fi

	if [ "$(uname | grep -i 'Darwin')" ]; then
		CADDY_OS='darwin'
		CADDY_DL_EXT='.zip'
		OSX_VER="$(sw_vers | grep ProductVersion | cut -d':' -f2 | cut -f2)"
		OSX_MAJOR="$(echo ${OSX_VER} | cut -d'.' -f1)"
		OSX_MINOR="$(echo ${OSX_VER} | cut -d'.' -f2)"
		OSX_PATCH="$(echo ${OSX_VER} | cut -d'.' -f3)"

		# Major
		if [ "$OSX_MAJOR" -lt 10 ]; then
			echo "unsupported OS X version (9-)"
			exit 2
		fi
		if [ "$OSX_MAJOR" -gt 10 ]; then
			echo "unsupported OS X version (11+)"
			exit 2
		fi

		# Minor
		if [ "$OSX_MINOR" -le 5 ]; then
			echo "unsupported OS X version (10.5-)"
			exit 2
		fi
	elif [ "$(uname | grep -i 'Linux')" ]; then
		CADDY_OS='linux'
	elif [ "$(uname | grep -i 'FreeBSD')" ]; then
		CADDY_OS='freebsd'
	elif [ "$(uname | grep -i 'OpenBSD')" ]; then
		CADDY_OS='openbsd'
	elif [ "$(uname | grep -i 'WIN')" ]; then
		# Should catch cygwin
		CADDY_OS='windows'
		CADDY_DL_EXT='.zip'
		CADDY_BIN=$CADDY_BIN.exe
	else
		echo "unsupported or unknown os"
		exit 3
	fi

	# Back up existing caddy, if any
	CADDY_CUR_VER="$(caddy --version 2>/dev/null | cut -d ' ' -f2)"
	if [ -n "${CADDY_CUR_VER}" ]; then
		# caddy of some version is already installed
		CADDY_PATH="$(which caddy)"
		CADDY_BACKUP="${CADDY_PATH}_${CADDY_CUR_VER}"
		echo "Backing up ${CADDY_PATH} to ${CADDY_BACKUP}"
		echo "(Password may be required.)"
		$SUDO_CMD mv "${CADDY_PATH}" "${CADDY_BACKUP}"
	fi

	########################
	# Download and extract #
	########################


	echo "Downloading Caddy for ${CADDY_OS}/${CADDY_ARCH}..."
	CADDY_FILE="caddy_${CADDY_OS}_${CADDY_ARCH}${CADDY_ARM}_custom${CADDY_DL_EXT}"
	CADDY_URL="https://caddyserver.com/download/build?os=${CADDY_OS}&arch=${CADDY_ARCH}&arm=${CADDY_ARM}&features=${CADDY_FEATURES}"
	echo "$CADDY_URL"

	rm -rf "/tmp/${CADDY_FILE}"

	if [ -n "$(which curl)" ]; then
		curl -fsSL "$CADDY_URL" \
			-o /tmp/${CADDY_FILE}
	elif [ -n "$(which wget)" ]; then
		wget --quiet "$CADDY_URL" \
			-O /tmp/${CADDY_FILE}
	else
		echo "could not find curl or wget"
		exit 4
	fi

	echo "Extracting..."
	case "$CADDY_FILE" in
	        *.zip)    unzip -o "/tmp/$CADDY_FILE" "$CADDY_BIN" -d /tmp/ ;;
	        *.tar.gz) tar -xzf "/tmp/$CADDY_FILE" -C /tmp/ "$CADDY_BIN" ;;
	esac
	chmod +x /tmp/$CADDY_BIN

	echo "Putting caddy in /usr/local/bin (may require password)"
	$SUDO_CMD mv /tmp/$CADDY_BIN /usr/local/bin/$CADDY_BIN
	$SUDO_CMD rm /tmp/$CADDY_FILE


	$CADDY_BIN --version

	echo "Successfully installed"
	exit 0
}

install_caddy "$@"