Convert an existing docker container into a "docker run" command line

.bashrc

# Convert an existing docker container into a "docker run" command line.
# 
# This is useful when trying to debug containers that have been created
# by orchestration tools.
#
# Install jq: stedolan.github.io/jq/

function format_run() {
    cid=$1

    json=$(docker inspect $cid 2>&1)

    # parse container info
    entrypoint=$(  echo $json | jq -r '.[0].Config.Entrypoint | join(" ")'             )
    envvars=$(     echo $json | jq -r '(.[0].Config.Env | [" -e " + .[]] | join(""))'  )
    image=$(       echo $json | jq -r .[0].Image                                       )
    cmd=$(         echo $json | jq -r '.[0].Config.Cmd | join(" ")'                    )

    echo "docker run --entrypoint $entrypoint $envvars $image $cmd"
}

Here's with volumes too:

function format_run() {
    cid=$1

    json=$(docker inspect $cid 2>&1)

    # parse container info
    entrypoint=$(echo $json | jq -r '.[0].Config.Entrypoint | join(" ")')
    envvars=$(echo $json | jq -r '(.[0].Config.Env | [" -e " + .[]] | join(""))')
    image=$(echo $json | jq -r .[0].Image)
    cmd=$(echo $json | jq -r '.[0].Config.Cmd | join(" ")')
    
    # Parse port mappings
    mapped_to_container=`(echo $json| jq '.[0].NetworkSettings.Ports' | jq 'to_entries[] | .key' | tr -d '"' | cut -f 1- -d\/ --output-delimiter=$'\n' )`
    mapped_to_host=$(echo $json | jq -r '.[0].NetworkSettings.Ports | to_entries | map(.value[].HostPort) | join(" ")')

    array=(${mapped_to_container// / })
    array2=(${mapped_to_host// / })

    ports_result=()

    for i in "${!array[@]}"; do
        for b in "${!array2[@]}"; do
            if [[ "$i" == "$b" ]]; then
                port_map="-p ${array[i]}:${array2[b]}"
                ports_result+=($port_map)
            fi
        done
    done

    # Parse volume information
    volumes=$(echo $json | jq -r '.[0].Mounts | map("-v " + .Source + ":" + .Destination) | join(" ")')

    echo "docker run --entrypoint $entrypoint $envvars ${ports_result[@]} $volumes $image $cmd"
}