bash helper functions for docker

.bash_profile

###
# Docker-related functions and aliases
###

# Include these into your ~/.bash_profile; don't replace your ~/.bash_profile with this

alias dc="docker-compose"
alias dcr="docker-compose run --rm"
alias dce="docker-compose exec"

function dcrspec() {
        spec_file=$1

        dcr web bundle exec rspec spec/${spec_file#spec/}
}

function get_cache_prefix() {
        full_path_without_dir_separators=${PWD///}

        echo ${full_path_without_dir_separators// }
}

function _get_docker_container_names() {
        docker-compose config | egrep '^  [a-z]*:' | grep -v '{}' | tee $cache_file
}

function get_docker_container_names() {
        cache_file=/tmp/`get_cache_prefix`_get_docker_container_names.cache

        # Cache which expires in 24 hours

        if [ -f $cache_file ]; then
                cache_modification_stamp=`date -r $cache_file +"%s"`
                let cache_expiration_stamp=`date +"%s"`-86400

                if [ "$cache_expiration_stamp" -ge "$cache_modification_stamp" ]; then
                        _get_docker_container_names
                else
                        cat $cache_file
                fi
        else
                _get_docker_container_names
        fi
}

function is_container_name() {
        container=$1

        for possible_container in `get_docker_container_names`; do
                if [ "$container" == "${possible_container//:}" ]; then
                        return 0
                fi
        done

        return 1
}

function get_fully_qualified_container_name() {
        container=$1

        prefix=${PWD##*/}
        prefix=${prefix//[^a-zA-Z]/}

        echo ${prefix}_${container}
}

function is_container_running() {
        container=$1

        fully_qualified_container_name=`get_fully_qualified_container_name $container`
        running_containers_found=`docker ps --filter name=$fully_qualified_container_name | grep -v 'CONTAINER ID' | wc -l`

        if [ "0" == "${running_containers_found// /}" ]; then
                # container is not running
                return 1
        else
                # container is running
                return 0
        fi
}

function get_container_name() {
        container=$1

        is_container_name $container
        if [ "0" == "$?" ]; then
                echo $container
                return 0
        else
                echo web
                return 1
        fi
}

function get_run_type() {
        container=$1

        is_container_running $container
        if [ "0" == "$?" ]; then
                echo "exec"
                return 0
        else
                echo "run --rm"
                return 1
        fi
}

function dcb() {
        container=`get_container_name $1`

        if [ "0" == "$?" ]; then
                shift
        fi

        run_type=`get_run_type $container`

        echo Container: $container
        echo Command: bundle $@
        echo Run Type: $run_type
        docker-compose $run_type $container bundle $@
}

function dcbe() {
        container=`get_container_name $1`

        if [ "0" == "$?" ]; then
                shift
        fi

        run_type=`get_run_type $container`

        echo Container: $container
        echo Command: bundle exec $@
        echo Run Type: $run_type
        docker-compose $run_type $container bundle exec $@
}

function dcrails() {
        container=`get_container_name $1`

        if [ "0" == "$?" ]; then
                shift
        fi

        run_type=`get_run_type $container`

        echo Container: $container
        echo Command: bundle exec rails $@
        echo Run Type: $run_type
        docker-compose $run_type $container bundle exec rails $@
}

function dcrake() {
        container=`get_container_name $1`

        if [ "0" == "$?" ]; then
                shift
        fi

        run_type=`get_run_type $container`

        echo Container: $container
        echo Command: bundle exec rake $@
        echo Run Type: $run_type
        docker-compose $run_type $container bundle exec rake $@
}