bootstrap

#!/bin/sh
# This is the bootstrap script. The universal tool to setup any host for
# building snapd. This script is never complete. If you are reading it because
# it failed on your distribution then I encourage you to patch it and share
# your patch with the upstream developers.

#: Identifier of the operating system as described by os-release(5)
devtools_ID=

#: Identifier of the operating system as described by os-release(5)
devtools_ID_LIKE=

#: Version of the operating system as described by os-release(5)
devtools_VERSION_ID=

#: Pretty name of the operating system as described by os-release(5)
devtools_PRETTY_NAME=

#: Default value of GOPATH that is set if there is no other value yet
devtools_GOPATH='~/go'

#: Name of the native packaging system (wrapper) of the host OS.
#: Supported values are: apt yum dnf zypper pacman
devtools_host_pkg_tool=

#: List of package names that need to be installed with the native packaging
# system of the host OS.
devtools_host_pkg_list=

#: Flag indicating if pre-built go release should be downloaded and installed.
#: Set to "yes" to enable.
devtools_prebuilt_go=no

#: Flag indicating if ~/.profile was modified.
devtools_profile_changed=no


detect_os() {
	if [ -e /etc/os-release ]; then
		devtools_ID="$( . /etc/os-release && echo "${ID:-linux}" )"
		devtools_ID_LIKE="$( . /etc/os-release && echo "${ID_LIKE}" )"
		devtools_VERSION_ID="$( . /etc/os-release && echo "${VERSION_ID}" )"
		devtools_PRETTY_NAME="$( . /etc/os-release && echo "${PRETTY_NAME}" )"
	else
		echo "Unable to detect operating system type"
		echo "Please read this script and improve it!"
		exit 1
	fi
}


determine_requirements_like_debian() {
	devtools_host_pkg_tool=apt
	devtools_host_pkg_list="git bzr automake autoconf indent make gcc squashfs-tools golang-go"
}

determine_requirements_rhel() {
	case "$devtools_VERSION_ID" in
		7.2)
			devtools_prebuilt_go=yes
			devtools_host_pkg_tool=yum
			devtools_host_pkg_list="git bzr automake autoconf indent make gcc squashfs-tools wget"
			;;
		*)
			echo "Unsupported RHEL version: $devtools_VERSION_ID"
			echo "Please read this script and improve it!"
			exit 1
			;;
	esac
}

determine_requirements_fedora() {
	case "$devtools_VERSION_ID" in
		24)
			devtools_host_pkg_tool=dnf
			devtools_host_pkg_list="git bzr automake autoconf indent make gcc squashfs-tools golang"
			;;
		*)
			echo "Unsupported Fedora version: $devtools_VERSION_ID"
			echo "Please read this script and improve it!"
			exit 1
			;;
	esac
}

determine_requirements_opensuse() {
	case "$devtools_VERSION_ID" in
		42.1)
			devtools_host_pkg_tool=zypper
			devtools_host_pkg_list="git bzr automake autoconf indent make gcc squashfs go"
			;;
		*)
			echo "Unsupported openSUSE version: $devtools_VERSION_ID"
			echo "Please read this script and improve it!"
			exit 1
			;;
	esac
}

determine_requirements_gentoo() {
	devtools_host_pkg_tool=emerge
	devtools_host_pkg_list="dev-vcs/git dev-vcs/bzr sys-devel/automake sys-devel/autoconf dev-util/indent sys-devel/make sys-devel/gcc sys-fs/squashfs-tools dev-lang/go"
}

determine_requirements_other() {
	if [ "${devtools_ID_LIKE}" = "debian" ]; then
		determine_requirements_like_debian
	else
		echo "Unsupported distribution: $devtools_ID"
		echo "Please read this script and improve it!"
		exit 1
	fi
}

determine_requirements() {
	case "$devtools_ID" in
		fedora) determine_requirements_fedora ;;
		gentoo) determine_requirements_gentoo ;;
		opensuse) determine_requirements_opensuse ;;
		rhel) determine_requirements_rhel ;;
		*) determine_requirements_other ;;
	esac
}


install_native_packages() {
	# Check if there is anything to do first
	devtools_install_needed=no
	case "$devtools_host_pkg_tool" in
		apt)
			for devtools_host_pkg in $devtools_host_pkg_list; do
				if ! dpkg --status "$devtools_host_pkg" | grep -F -q 'Status: install ok installed'; then
					devtools_install_needed=yes
					break
				fi
			done
			;;
		emerge)
			set -x
			for devtools_host_pkg in $devtools_host_pkg_list; do
				if ! emerge --pretend --quiet "$devtools_host_pkg" | grep -v -F '[ebuild   R   ]'; then
					devtools_install_needed=yes
					break
				fi
			done
			set +x
			;;
		yum|zypper|dnf)
			for devtools_host_pkg in $devtools_host_pkg_list; do
				if ! rpm -q --quiet "$devtools_host_pkg"; then
					devtools_install_needed=yes
					break
				fi
			done
			;;
		*)
			echo "Unsupported native package manager: $devtools_host_pkg_tool"
			exit 1
	esac
	if [ "$devtools_install_needed" = no ]; then
		# If there is nothing to do, don't try to install packages in vein
		return
	fi
	case "$devtools_host_pkg_tool" in
		apt)
			devtools_host_pkg_install_cmd="apt install $devtools_host_pkg_list"
			;;
		emerge)
			devtools_host_pkg_install_cmd="emerge $devtools_host_pkg_list"
			;;
		yum)
			devtools_host_pkg_install_cmd="yum install $devtools_host_pkg_list"
			;;
		dnf)
			devtools_host_pkg_install_cmd="dnf install $devtools_host_pkg_list"
			;;
		zypper)
			devtools_host_pkg_install_cmd="zypper install $devtools_host_pkg_list"
			;;
		*)
			echo "Unsupported native package manager: $devtools_host_pkg_tool"
			exit 1
	esac
	# Really install packages now
	echo "Installing required packages using native packaging system..."
	set -x
	sudo $devtools_host_pkg_install_cmd || exit 1
	set +x
}


install_prebuilt_go() {
	if [ "$devtools_prebuilt_go" != yes ]; then
		# Don't download and install pre-built go release unless required
		return
	fi
	# Which release to download?
	devtools_arch="$(uname -m)"
	case "$devtools_arch" in
		i386|i686)
			devtools_go_dist=go1.6.2.linux-386.tar.gz
			devtools_go_dist_sha512=36f31debe7797999ba023230a78668f1a4893b24dbf2af3f2ff361dec3b84557abeb9bdd6595b65ae852c3b353fccecc213a68da26da8a11742338677ca5555f
			;;
		x86_64)
			devtools_go_dist=go1.6.2.linux-amd64.tar.gz
			devtools_go_dist_sha512=6c3102f74df0cc4c533eb7ffc99c364c9d238067dfa8626aac4e684a6a0a0bb079afc3bb98db16bd44fdde529c4fe60554d6d30272ca4bb365926646de0c4d3d
			;;
		*)
			echo "Unsupported processor architecture: $devtools_arch"
			echo "There is no pre-built release of go that can be used on your processor"
			exit 1
			;;
	esac
	if [ ! -d /usr/local/go ]; then
		# Download go...
		if [ ! -f $devtools_go_dist ]; then
			echo "Downloading pre-built go release..."
			set -x
			wget "https://storage.googleapis.com/golang/$devtools_go_dist" || exit 1
			set +x
		fi
		# ... then check it...
		if [ "$(sha512sum "$devtools_go_dist" | cut -d ' ' -f 1)" != "$devtools_go_dist_sha512" ]; then
			echo "Downloaded pre-built go release doesn't match expected sha512 checksum"
			echo "The file is: $devtools_go_dist"
			echo "The expected checksum was: $devtools_go_dist_sha512"
			echo
			echo "Please inspect and remove it then re-run this script."
			echo "If the problem persists please report this problem using:"
			echo "https://github.com/zyga/devtools/issues/new"
			exit 1
		fi
		# ... and install it to /usr/local
		echo "Installing pre-built go release..."
		set -x
		sudo tar -C /usr/local -xzf "$devtools_go_dist" || exit 1
		set +x
	fi
	# Add the new local installation to PATH
	if echo "$PATH" | grep -q /usr/local/go/bin; then
		# Don't modify $PATH unless required
		return
	fi
	if [ -f ~/.profile ] && grep -q '^# devtools: path$' ~/.profile; then
		# Don't add the same thing twice
		return
	fi
	echo "Adding locally-installed go to PATH"
	devtools_profile_changed=yes
	cat >> ~/.profile << __SNIPPET__
# Added by github.com/zyga/devtools (bootstrap.sh)
# devtools: path
export PATH="\$PATH:/usr/local/go/bin"
__SNIPPET__
}


setup_gopath() {
	if [ -n "$GOPATH" ]; then
		# Don't clobber $GOPATH if the user already has one
		return
	fi
	if [ -f ~/.profile ] && grep -E -q '^# devtools: gopath$' ~/.profile; then
		# Don't add the same thing twice
		return
	fi
	echo "Setting GOPATH to $devtools_GOPATH"
	devtools_profile_changed=yes
	cat >> ~/.profile << __SNIPPET__
# Added by github.com/zyga/devtools (bootstrap.sh)
# devtools: gopath
export GOPATH=$devtools_GOPATH
__SNIPPET__
}


notify_of_profile_changes() {
	if [ "$devtools_profile_changed" = yes ]; then
		echo "==========================================================="
		echo "NOTE: This script has modified your shell profile but those"
		echo "changes are not automatically applied to your running shell"
		echo
		echo "To be able to build snapd re-load your shell profile file"
		echo "Using the following command:"
		echo " . ~/.profile"
	fi
}


show_summary() {
	echo "==========================================================="
	echo "Operating system:             $devtools_PRETTY_NAME"
	echo "Native package manager:       $devtools_host_pkg_tool"
	echo "List of required packages:    $devtools_host_pkg_list"
	echo "Install pre-built go release: $devtools_prebuilt_go"
	echo
	echo "You should be good to go now :-)"
	echo "Try running the refresh-bits script"
	echo " $ refresh-bits snap snapd"
	echo
	echo "Good luck!"
	echo
}


detect_os
determine_requirements
install_native_packages
install_prebuilt_go
setup_gopath
notify_of_profile_changes
show_summary