update script for https://aur.archlinux.org/packages/docker-rootless-bin/

mk_pkgbuild.rb

require 'erb'
require 'net/http'

DOC_TEXT = <<-DOC
# Get started:
git clone ssh://aur@aur.archlinux.org/docker-rootless-bin.git
cd docker-rootless-bin
curl https://gist.githubusercontent.com/pastleo/d3d0fd02880dbd9b30647c91d1fdb8f9/raw/mk_pkgbuild.rb > mk_pkgbuild.rb

# Update:
ruby mk_pkgbuild.rb PKGBUILD
makepkg
makepkg --printsrcinfo > .SRCINFO
git add --all
git commit -m 'update pkgvar with upstream'
git push
DOC

if ARGV.length < 1
	puts "Please provide PKGBUILD path"
	exit 127
end
if ['-h', '--help'].include?(ARGV[0])
	puts DOC_TEXT
	exit
end

pkgbuild_path = ARGV[0]

PKGBUILD_TEMPLATE = ERB.new <<-EOF
# Maintainer: PastLeo <chgu82837@gmail.com>
pkgname=docker-rootless-bin
pkgver=<%= pkgver %>
pkgrel=1
pkgdesc="Run the Docker daemon as a non-root user (Rootless mode)"
arch=('x86_64')
url="https://docs.docker.com/engine/security/rootless/"
license=('Apache')
depends=('docker')
provides=('docker-rootless')
conflicts=('docker-rootless')
install=docker-rootless.install
source=(
	"https://download.docker.com/linux/static/stable/x86_64/docker-rootless-extras-$pkgver.tgz"
	"docker.service"
)

md5sums=(
	"<%= bin_tgz_md5sum %>"
	"04425cca4e95bf534c41697aeabfcad4"
)

sha256sums=(
	"<%= bin_tgz_sha256sum %>"
	"edf633c42d27e039d5acbb1ead685d6acd66b06786a8552e1bbe5f789dc2c315"
)

package() {
	mkdir -p "$pkgdir/usr/bin/"
	install -Dm755 "$srcdir/docker-rootless-extras/"* "$pkgdir/usr/bin/"
	install -Dm644 "$srcdir/docker.service" "$pkgdir/usr/lib/systemd/user/docker.service"
}
EOF
BIN_FILENAME_REGEX = /docker-rootless-extras-(\d+)\.(\d+)\.(\d+)\.tgz/

docker_bin_index_html = Net::HTTP.get(URI('https://download.docker.com/linux/static/stable/x86_64/'))
latest_versions =
	docker_bin_index_html.scan(BIN_FILENAME_REGEX).sort do |a, b|
		a.zip(b).map {|a, b| a.to_i <=> b.to_i }.find {|c| c != 0 } || 0
	end.last.join('.')
pkgver = latest_versions
bin_tgz = "docker-rootless-extras-#{pkgver}.tgz"
bin_tgz_url = "https://download.docker.com/linux/static/stable/x86_64/#{bin_tgz}"
bin_tgz_tmp = "/tmp/#{bin_tgz}"

`curl #{bin_tgz_url} >> #{bin_tgz_tmp}`
bin_tgz_md5sum = `md5sum -z #{bin_tgz_tmp}`.strip.split(' ')[0]
bin_tgz_sha256sum = `sha256sum -z #{bin_tgz_tmp}`.strip.split(' ')[0]
`rm #{bin_tgz_tmp}`

File.write(
	pkgbuild_path,
	PKGBUILD_TEMPLATE.result(binding)
)
puts "Done."