docker-suffix-with-arch

#! /usr/bin/env bash
#
# Disambiguates images for a multi-arch build by suffixing their tag with the current architecture.
#
set -eux

arch=$(docker info -f "{{ .Architecture }}")
image_mapping="images-${arch}"
rm -f "$image_mapping"

# create a new tag suffixed with the current architecture for each image in pushme
# write the before/after image names to a file so that we can group them for the multi-arch manifest later
for image in $(cat pushme); do
    arch_image="${image}-${arch}"
    docker tag "$image" "$arch_image"
    echo -e "${image}\t${arch_image}" >> "$image_mapping"
done

# update pushme to point to the new tags
cat "$image_mapping" | cut -f2 > pushme