download.sh

download.sh

#!/bin/bash -e
# A script to pull down multiarch artifacts with conflicting names stored in a single image index

PULLSPEC=$1
REPO=$(echo $PULLSPEC | awk -F ':' '{ print $1 }')
TAG=$(echo $PULLSPEC | awk -F ':' '{ print $2 }')

IMAGE_INDEX=$(oras manifest fetch $PULLSPEC)

OUTPUT=output/

while IFS= read -r manifest;
do
    manifest=$(echo $manifest | base64 -d)
    arch=$(echo $manifest | jq -r '.platform | "\(.os)/\(.architecture)"')
    digest=$(echo $manifest | jq -r '.digest')

    mkdir -p $OUTPUT/$arch
    oras pull --output $OUTPUT/$arch $REPO@$digest

done <<< $(jq -r '.manifests[] | @base64' <<< $IMAGE_INDEX)

tree $OUTPUT