Pulling (downloading) all official releases (versions) of Go (Golang) images from Docker Hub

docker-pull-golang.sh

#!/bin/bash

# The first release available is golang:1.2.0
major=1
minor=2
patch=0

while true
do
	while true
	do
		while true
		do
			if [ $patch -eq 0 ]
			then
				if [ $minor -eq 0 ]
				then
					# Pull golang:1, golang:2, etc.
					# which is an alias of the latest golang:1.x.x, golang:2.x.x, etc.
					docker pull golang:${major}
				fi
				# Pull golang:1.2, golang:1.3, etc.
				# which is an alias of the latest golang:1.2.x, golang:1.3.x, etc.
				docker pull golang:${major}.${minor}
			fi
			# Pull golang:1.2.0, golang:1.2.1, etc.
			docker pull golang:${major}.${minor}.${patch}
			if [ $? -ne 0 ]
			then
				break
			fi
			: $((++patch))
		done
		if [ $patch -eq 0 ]
		then
			break
		fi
		: $((++minor))
		patch=0
	done
	if [ $minor -eq 0 ]
	then
		break
	fi
	: $((++major))
	minor=0
done