docker-restic-cron/hooks/post_push

#!/bin/bash

# Use manifest-tool to create the manifest, given the experimental
# "docker manifest" command isn't available yet on Docker Hub.

TAG_ROOT=${DOCKER_TAG%-*}
TARGET_ARCH=""
case "$DOCKER_TAG" in
    *amd64)
        TARGET_ARCH="amd64"
        ;;
    *arm32v5)
        TARGET_ARCH="arm/v5"
        ;;
    *arm32v6)
        TARGET_ARCH="arm/v6"
        ;;
    *arm32v7)
        TARGET_ARCH="arm/v7"
        ;;
    *arm64v8)
        TARGET_ARCH="arm64/v8"
        ;;
    *i386)
        TARGET_ARCH="i386"
        ;;
    *ppc64le)
        TARGET_ARCH="ppc64le"
        ;;
    *s390x)
        TARGET_ARCH="s390x"
        ;;
    *)
        echo "Unknown target arch, skip manifest push"
        exit 0
        ;;
esac

# If the tag is essentially only the arch, we use latest
if [[ "$TAG_ROOT" == "$TARGET_ARCH" ]]; then
    TAG_ROOT="latest"
fi

curl -Lo manifest-tool https://github.com/estesp/manifest-tool/releases/download/v1.0.0/manifest-tool-linux-amd64
chmod +x manifest-tool

# Generate manifest file for this repo and tag root
sed "s#{DOCKER_REPO}#${DOCKER_REPO%:*}#;s#{TAG_ROOT}#${TAG_ROOT}#" multi-arch-manifest-tmpl.yml > multi-arch-manifest.yml
./manifest-tool push from-spec --ignore-missing multi-arch-manifest.yml

# Fix arch for image tags
./manifest-tool push from-args \
    --platforms "linux/$TARGET_ARCH" \
    --template "$DOCKER_REPO:$DOCKER_TAG" \
    --target "$DOCKER_REPO:$DOCKER_TAG"