render-local-registry

#!/usr/bin/env bash
LF=$'\n'
bold=$(tput bold)
normal=$(tput sgr0)
repo_image_tag='^([^/]+)(.+):(.+)'
helm='# Source: .+\.yaml'

template=$(</dev/stdin)

if ! [[ "${BASH_VERSINFO[5]}" =~ msys ]]; then
	tty=/dev/tty
# Microsoft Windows is weird
elif [[ "$template" =~ $helm ]]; then
	tty=/dev/console
else
	tty=/dev/stderr
fi

trap 'echo "$normal" >$tty' EXIT

@() {
	echo "$LF$bold$*$normal" >$tty
	"$@"
}

preload() {
	local image
	yq -r '.spec.template.spec.containers[].image' 2>/dev/null | tr -d $'\r' | while read -r image; do
		local local=localhost:5000/$image
		if [[ "$local" =~ $repo_image_tag ]]; then
			local version="\"${BASH_REMATCH[3]}\""
			[[ $(curl -sS "${BASH_REMATCH[1]}/v2${BASH_REMATCH[2]}/tags/list") =~ $version ]] && continue
		fi
		[[ -n "$(docker images -q --filter=reference="$image")" ]] || @ docker pull "$image"
		@ docker tag "$image" "$local"
		@ docker push "$local"
	done
}

preload <<<"$template" >$tty

sed -E -e 's,[[:space:]]image:[^[:alnum:]]+,&localhost:5000/,' -e '/imagePullPolicy/s/IfNotPresent/Always/' <<<"$template"