docker_reg_tool

#!/bin/bash
set -eo pipefail

CMD=$0

function isTruthy {
    local arg=$1

    if [[ "$arg" = true ]] || [[ "$arg" = "true" ]] || [[ "$arg" -eq 1 ]]; then
        echo "true"
    fi

}

if [[ ${TRACE} ]] && [[ $(isTruthy "$TRACE") ]]; then
    set -x
fi


function usage {
    cat <<EOU

    Usage:

    $CMD REGISTRY_BASE_URL ACTION [OPTIONS..]

    Actions:

    - list               list repos

    - list REPO          list tags for repo

    - delete REPO TAG    delete tag for repo

    Example:

    List all repos
        /$ $CMD https://registry.my.domain list

    List tags for one repo
        /$ $CMD https://registry.my.domain list some-repo

    Delete tag for a repo
        /$ $CMD https://registry.my.domain delete some-repo some-tag


EOU
    exit 1
}



[ $# -lt 2 ] && usage

set +e
PROTO="$(echo $1 | grep :// | sed -e's,^\(.*://\).*,\1,g')"
set -e

[ -z "$PROTO" ] && >&2 echo "ERROR: Must have protocol in registry url" && usage

# remove the protocol
REG="$(echo ${1/$PROTO/})"
shift
ACTION="$1"
shift

CREDS=""
DOCKER_CONFIG="${DOCKER_CONFIG:-$HOME/.docker/config.json}"

if [[ ${BASIC_AUTH} ]]; then
    CREDS="Authorization: Basic $(echo -n $BASIC_AUTH|base64)"
elif [[ -f "$DOCKER_CONFIG" ]]; then
    AUTH_INFO=$(jq -r '.auths["'$REG'"].auth' < "$DOCKER_CONFIG")
    if [ "$AUTH_INFO" = "null" ]; then
        AUTH_INFO=$(jq -r '.auths."'$PROTO$REG'".auth' < "$DOCKER_CONFIG")
        if [ "$AUTH_INFO" = "null" ]; then
            echo "ERROR: Failed to retrieve credentials from $DOCKER_CONFIG for ${REG}!"
            exit 4
        fi
    fi
    CREDS="Authorization: Basic $AUTH_INFO"
fi

SEC_FLAG=""

if [[ ${INSECURE_REGISTRY} ]] && [[ $(isTruthy "$INSECURE_REGISTRY") ]]; then
    SEC_FLAG="-k"
fi

function curlCmd {
    curl "$SEC_FLAG" --header "$CREDS" $*
}



case "$ACTION" in
    list)
        if [ $# -eq 1 ]; then
            repo=${1}
            if [ -n "$repo" ]; then
                curlCmd -s "$PROTO$REG/v2/$repo/tags/list" | jq -r '.tags|.[]'
            fi
        else
            curlCmd -s "$PROTO$REG/v2/_catalog?n=500" | jq -r '.repositories|.[]'
        fi

        ;;
    delete)
        repo=$1
        tag=$2
        response=$(curlCmd -v -s -H "Accept:application/vnd.docker.distribution.manifest.v2+json" "$PROTO$REG/v2/$repo/manifests/$tag" 2>&1)
        digest=$(echo "$response" | grep -i "< Docker-Content-Digest:"|awk '{print $3}' || echo "")
        [ -z "$digest" ] &&
          response=$(curlCmd -v -s -H "Accept:application/vnd.oci.image.manifest.v1+json" "$PROTO$REG/v2/$repo/manifests/$tag" 2>&1) &&
          digest=$(echo "$response" | grep -i "< Docker-Content-Digest:"|awk '{print $3}')
        digest=${digest//[$'\t\r\n']}
        echo "DIGEST: $digest"
        result=$(curlCmd -s -o /dev/null -w "%{http_code}" -H "Accept:application/vnd.docker.distribution.manifest.v2+json" -X DELETE "$PROTO$REG/v2/$repo/manifests/$digest")
        if [ "$result" -eq 202 ]; then
            echo "Successfully deleted"
            exit 0
        else
            echo "Failed to delete: $result"
            exit 3
        fi
        ;;
esac