#!/usr/bin/env bash

set -eu

bindir=$( cd "${BASH_SOURCE[0]%/*}" && pwd )

# shellcheck source=_log.sh
. "$bindir"/_log.sh

# TODO this should be set to the canonical public docker registry; we can override this
# docker registry in, for instance, CI.
export DOCKER_REGISTRY=${DOCKER_REGISTRY:-gcr.io/linkerd-io}

# When set, causes docker's build output to be emitted to stderr.
export DOCKER_TRACE=${DOCKER_TRACE:-}

docker_repo() {
    repo=$1

    name=$repo
    if [ -n "${DOCKER_REGISTRY:-}" ]; then
        name="$DOCKER_REGISTRY/$name"
    fi

    echo "$name"
}

docker_build() {
    repo=$(docker_repo "$1")
    shift

    tag=$1
    shift

    file=$1
    shift

    output=/dev/null
    if [ -n "$DOCKER_TRACE" ]; then
        output=/dev/stderr
    fi

    rootdir=$( cd "$bindir"/.. && pwd )

    log_debug "  :; docker build $rootdir -t $repo:$tag -f $file $*"
    docker build "$rootdir" \
        -t "$repo:$tag" \
        -f "$file" \
        "$@" \
        > "$output"

    echo "$repo:$tag"
}

docker_pull() {
    repo=$(docker_repo "$1")
    tag=$2
    log_debug "  :; docker pull $repo:$tag"
    docker pull "$repo:$tag"
}

docker_push() {
    repo=$(docker_repo "$1")
    tag=$2
    log_debug "  :; docker push $repo:$tag"
    docker push "$repo:$tag"
}

docker_retag() {
    repo=$(docker_repo "$1")
    from=$2
    to=$3
    log_debug "  :; docker tag $repo:$from $repo:$to"
    docker tag "$repo:$from" "$repo:$to"
    echo "$repo:$to"
}