#!/bin/bash

set -eo pipefail

RUNNER="${RUNNER:-docker}"
IMAGE="${IMAGE:-rancher/shell:dev}"

function run(){
    "${RUNNER}" run --rm "${IMAGE}" $1
}

function stat(){
    run "stat -c $1 $2"
}

function expected_file(){
    file="$1"
    owner="$2"
    perms="$3"
        
    actualPerms=$(stat '%a' "${file}")
    actualOwner=$(stat '%u:%g' "${file}")
    if [[ "${actualPerms}" != "${perms}" ]] || \
        [[ "${actualOwner}" != "${owner}" ]]; then
        echo "${file}: expected (${owner} ${perms}) got (${actualOwner} ${actualPerms})"
        exit 1
    else 
        echo "${file}: OK"
    fi
}

function check_files(){
    echo "checking expected binaries:"
    expected_file "/usr/local/bin/helm" "0:0" "755"
    expected_file "/usr/local/bin/helm-cmd" "0:0" "755"
    expected_file "/usr/local/bin/k9s" "0:0" "755"
    expected_file "/usr/local/bin/kubectl" "0:0" "755"
    expected_file "/usr/local/bin/kustomize" "0:0" "755"
    expected_file "/usr/local/bin/welcome" "0:0" "755"
    expected_file "/home/shell/kustomize.sh" "1000:1000" "755"
}


function expected_version(){
    cmd="$1"
    version="$2"

    if [[ -z "${version}" ]]; then
        echo "expected version for ${cmd} not set"
        exit 1
    fi

    output=$(run "${cmd} version" 2> /dev/null)
    if echo "${output}" | grep -q "${version}"; then
        echo "${cmd} ${version}: OK"
    else
        echo "${cmd} expected ${version}: ${output}"
        exit 1
    fi
}

function check_versions(){
    echo "checking command versions:"
    expected_version "helm" "${HELM_VERSION}"
    expected_version "kustomize" "${KUSTOMIZE_VERSION}"
    expected_version "k9s" "${K9S_VERSION}"
    # --client=true is used so that it does not fail trying to
    # identify the server version.
    expected_version "kubectl --client=true" "${KUBECTL_VERSION}"
}

function main(){
    check_files
    check_versions
}

main