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action.yml
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action.yml
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# https://help.github.com/en/articles/metadata-syntax-for-github-actions
name: 'DockerHub mirror'
description: 'GitHub Action to mirror a DockerHub repo to another registry'
author: 'crazy-max'
branding:
color: 'green'
icon: 'copy'
inputs:
dockerhub-username:
description: 'DockerHub username'
required: true
dockerhub-password:
description: 'DockerHub password or persona laccess token'
required: true
dockerhub-repo:
description: 'DockerHub repo to mirror'
required: true
dest-registry:
description: 'Destination registry (eg. ghcr.io)'
required: true
dest-repo:
description: 'Destination repo (eg. username/repo)'
required: true
dry-run:
description: 'Dry run'
required: false
default: 'false'
runs:
using: 'composite'
steps:
-
run: |
set -e
DOCKERHUB_USERNAME=${{ inputs.dockerhub-username }}
DOCKERHUB_PASSWORD=${{ inputs.dockerhub-password }}
DOCKERHUB_REPO=${{ inputs.dockerhub-repo }}
DOCKER_DEST_REGISTRY=${{ inputs.dest-registry }}
DOCKER_DEST_REPO=${{ inputs.dest-repo }}
PUSH_FLAG=""
if [ "${{ inputs.dry-run }}" = "false" ]; then
PUSH_FLAG="--push"
fi
function get_platforms() {
local images=${1}
platforms=""
for image in $images; do
_jq() {
echo "${image}" | base64 --decode | jq -r "${1}"
}
os=$(_jq '.os')
arch=$(_jq '.architecture')
variant=$(_jq '.variant')
platform="$os/$arch"
if [ -n "$variant" ] && [ "$variant" != "null" ]; then
platform="$platform/$variant"
fi
if [ -n "$platforms" ]; then
platforms="$platforms,"
fi
platforms="$platforms$platform"
done
echo "$platforms"
}
TOKEN=$(curl -s -H "Content-Type: application/json" -X POST -d '{"username": "'${DOCKERHUB_USERNAME}'", "password": "'${DOCKERHUB_PASSWORD}'"}' https://hub.docker.com/v2/users/login/ | jq -r .token)
if [ -z "${TOKEN}" -o "${TOKEN}" == "null" ]; then
echo >&2 "error: cannot retrieve token"
exit 1
fi
TAG_LIST=$(curl -s -H "Authorization: Bearer ${TOKEN}" "https://hub.docker.com/v2/repositories/${DOCKERHUB_REPO}/tags/?page_size=10000" | jq -rc '.results | reverse | .[] | @base64')
for TAG in $TAG_LIST; do
_jq() {
echo "${TAG}" | base64 --decode | jq -r ${1}
}
TAG_NAME=$(_jq '.name')
TAG_IMAGES=$(echo "$(_jq '.images')" | jq -r '.[] | @base64')
TAG_PLATFORMS=$(get_platforms "${TAG_IMAGES}")
echo "::group::Copying ${DOCKERHUB_REPO}:${TAG_NAME} to ${DOCKER_DEST_REGISTRY}/${DOCKER_DEST_REPO}"
echo "FROM --platform=\${TARGETPLATFORM:-linux/amd64} ${DOCKERHUB_REPO}:${TAG_NAME}" > Dockerfile.tmp
docker buildx build \
${PUSH_FLAG} \
--platform "${TAG_PLATFORMS}" \
--tag "${DOCKER_DEST_REGISTRY}/${DOCKER_DEST_REPO}:${TAG_NAME}" \
--file ./Dockerfile.tmp .
echo "::endgroup"
done
shell: bash