#!/bin/bash

version=0.10
program=${0##*/}
progdir=${0%/*}
if [ "$progdir" = "$program" ]; then progdir="."; fi
if [ "$progdir" = "." ]; then progdir="$PWD"; fi
parent=$(dirname $progdir)

# ----------------------------------------------------------------------
function usage() {
    cat <<EOF
NAME
	$program - Run a docker datatracker container with suitable settings

SYNOPSIS
	$program [OPTIONS] ARGS

DESCRIPTION

	This is a wrapper which runs docker with suitable arguments on a
	debian-based docker image which has been set up with the dependencies
	needed to easily run the IETF datatracker in development mode.  By
	default, it expects to find MySWL database files at
	$parent/data/mysql, which is mapped inside the
	container to /var/lib/mysql, and it will set up a home directory for
	the current user ($USER) and map it to $HOME.

EOF
    echo -e "OPTIONS"
    if   [ "$(uname)" = "Linux" ]; then
        egrep "^[	]+[-][A-Za-z| -]+\*?\)[	]+[A-Za-z].+#" $0 | tr -s "\t|" "\t," | sed -r -e 's/\)[ \t]+([A-Z]+)=\$2[^#]*#/=\1\t/' -e 's/\)[^#]*#/\t/'
    else
        egrep "^[	]+[-][A-Za-z| -]+\*?\)[	]+[A-Za-z].+#" $0 | sed 's/\|.*\$2[^#]*#/	/'| sed -E 's/\|.*\)[^#]*#/	/'
    fi
    cat <<EOF

FILES

AUTHOR
	Written by Henrik Levkowetz, <henrik@levkowetz.com>

COPYRIGHT

	Copyright (c) 2015 IETF Trust and the persons identified as authors of
	the code. All rights reserved.  License 'Simplified BSD', as specified
	in http://opensource.org/licenses/BSD-3-Clause.
	
EOF

}

# ----------------------------------------------------------------------
function die() {
    echo -e "\n$program: error: $*" > /dev/stderr
    exit 1
}

function note() { 
	if [ -n "$VERBOSE" ]; then echo -e "$*"; fi
}

# ----------------------------------------------------------------------
function version() {
	echo -e "$program $version"
}

# ----------------------------------------------------------------------
trap 'echo "$program($LINENO): Command failed with error code $? ([$$] $0 $*)"; exit 1' ERR


# ----------------------------------------------------------------------
# Option parsing

# Options
shortopts=dhi:vVu:m:
longopts=download-data,help,ietfdb-url=,verbose,version,user=,mysqldata=,

# Default values

if   [ "$(uname)" = "Linux" ]; then
    args=$(getopt -o "$shortopts" --long "$longopts" -n '$program' -- $SV "$@")
    if [ $? != 0 ] ; then die "Terminating..." >&2 ; exit 1 ; fi
    eval set -- "$args"
    sed="sed -r"
else
    # Darwin, BSDs
    args=$(getopt -o$shortopts $SV $*)
    if [ $? != 0 ] ; then die "Terminating..." >&2 ; exit 1 ; fi
    set -- $args
    sed="sed -E"
fi

while true ; do
    case "$1" in
	-d| --download-data) DOWNLOAD=1;;	# Download and set up the database files
	-h| --help)	usage; exit;;		# Show this help, then exit
	-i| --ietfdb-url) URL=$2; shift;;	# Use an alternative database tarball URL
	-m| --mysqldir)	MYSQLDIR=$2; shift;;	# Set the desired location for MySQL's database files
	-u| --user)	WHO=$2; shift;;		# Run container as someone else than $USER
	-v| --verbose)	VERBOSE=1;;		# Be more talkative
	-V| --version)	version; exit;;		# Show program version, then exit
	--)		shift; break;;
	*) die "Internal error, inconsistent option specification: '$1'";;
    esac
    shift
done

# ----------------------------------------------------------------------
# The program itself

docker ps | grep -q levkowetz/datatracker:latest && die \
"It seems that another docker container is already running the
image 'levkowetz/datatracker:latest' -- but only one MySQL instance can bind
to the database files at a time.  Quitting."

[ -n "$WHO" ]		|| WHO=$(whoami)
[ -n "$MYSQLDIR" ]	|| MYSQLDIR=$parent/data/mysql
[ -n "$URL"]		|| URL=https://www.ietf.org/lib/dt/sprint/ietf_utf8.bin.tar.bz2

if [ -n "$DOWNLOAD" ]; then
    (
	cd $(dirname $MYSQLDIR)
	wget -N $URL && tar xjf ietf_utf8.bin.tar.bz2 && chmod -R go+rwX mysql
    )
    [ -d "$MYSQLDIR" ] || die "The download seems to have failed; still no $MYSQLDIR.  Giving up."
else
    [ -d "$MYSQLDIR" ] || die "Expected $MYSQLDIR to exist, but it\ndidn't.  Use '$program -d' to download and unpack the database."
fi

docker run -ti -p 8000:8000 -v $HOME:/home/$WHO -v $MYSQLDIR:/var/lib/mysql -e USER=$WHO -e DATADIR=${parent#$HOME/}/data levkowetz/datatracker:latest

echo "Committing changes in the container to an image:"
latest=$(docker ps -lq)
docker commit $latest levkowetz/datatracker:latest

echo "Cleaning up containers and images"
docker rmi $(docker images -f dangling=true -q)
docker rm $latest