dmstart

#!/usr/bin/env bash
# This is a shell script to start a Docker Machine
# virtual machine, if it is not already running

# Set full path to "docker-machine" command
DMCMD=$(command -v docker-machine)

# Check for presence of the "docker-machine" command
if [[ ! -x $DMCMD ]]; then
    echo "Docker Machine does not appear to be installed"
    exit 1
fi

# Check for correct parameters (exactly one VM name expected)
if [[ "$#" -ne 1 ]]; then
    echo "Incorrect number of parameters; please specify a single VM name"
    exit 1
fi

# Set the name of the Docker Machine VM
VM=$1

# Get the current status of the specified Docker Machine VM
# $STATUS will be zero-length if no matching VMs are found
STATUS=$($DMCMD ls | grep "$VM\s" | awk '{print $4}')

# If $STATUS is zero-length, report an error
if [[ -z $STATUS ]]; then
    echo "No matching Docker Machine VM found"
    exit 1
fi

# Start Docker Machine VM if it is not already running
if [[ $STATUS == 'Stopped' ]]; then
    $DMCMD start $VM
fi