run

#!/bin/bash

# See: https://github.com/VirusTrack/COVIDvu/blob/master/LICENSE 
# vim: set fileencoding=utf-8:

# Constants

CONTAINER_SIG_FILE="/proc/1/cgroup"


# Environment configuration:

export COVIDVU_JUPYTER_MOUNT_POINT="."
export COVIDVU_NIC_BIND="127.0.0.1" # localhost
export COVIDVU_PORT_BIND="8888"	    # Jupyter default
[[ -e 'run.env' ]] && source 'run.env'


# *** functions ***

function die {
    echo "$1"
    exit "$2"
} # die


function assertNotInContainer {
    if [[ "Linux" == $(uname) ]]
    then
        awk '/docker/ || /lxc/ { exit(99); }' "$CONTAINER_SIG_FILE"
        [[ "$?" == 0 ]] || die "run failed - cannot execute inside a container" 5
    fi
} # assertNotInContainer


function assertPackageIndexAvailability {
    [[ -n "$DEVPI_HOST" ]] || die "DEVPI_HOST environment variable not set" 3
    [[ -n "$PIP_TRUSTED_HOST" ]] || die "PIP_TRUSTED_HOST environment variable not set" 4

    curl "$DEVPI_HOST" &> /dev/null || die "Package index server at $DEVPI_HOST is unavailable; start devpi-server" 6
} # assertPackageIndexAvailability


function checkDockerIsAvailable {
    which docker-compose > /dev/null || die "docker-compose unavailable or not in path" 1
} # checkDockerIsAvailable


function checkDockerComposeFileExists {
    [[ -e "./docker-compose.yaml" ]] || die "docker-compose.yaml is not present in pwd == $(pwd)" 2
} # checkDockerComposeFileExists


function setOwnership {
    # Set ownership to the correct user:group to avoid conflicts
    # between the internal Docker container user names and the 
    # host's.
    #
    # This script resolves to the userID:groupID of the account
    # from whence it was invoked.
    #
    # Documented method because Docker permissions and ownership
    # kinda suck.
    export JUPYTER_LAB_USER=$(id -u)
    export JUPYTER_LAB_GROUP=$(id -g)
} # setOwnership


function runJupyterScienceLab {
    local covidvuContainer=$(docker ps | awk '$0 ~ "covidvu_cime_dev" { print($NF); }')

    if [[ -n "$covidvuContainer" ]]
    then
        docker rm -f "$covidvuContainer"
    fi

   env | awk '/COVIDVU/ || /JUPYTER/ || /HOME/' | sort
   docker-compose up --remove-orphans --no-recreate -d || docker-compose rm -f 
} # runJupyterScienceLab


# *** main ***

assertNotInContainer
# TODO:  https://github.com/VirusTrack/COVIDvu/issues/17
# assertPackageIndexAvailability
checkDockerIsAvailable
checkDockerComposeFileExists
setOwnership
runJupyterScienceLab "$1"