#!/bin/bash

#/**
#         oglivecli command [options ...]
#@file    oglivecli
#@brief   Command line tool to manage ogLive clients.
#@param   $1 command  Command to execute.
#@param   $2 options  Parameters and options.
#@warning This script uses "jq" command.
#@version 1.1.0 - Initial version.
#@author  Ramón M. Gómez - ETSII Univ. Sevilla
#@date    2016-12-05
#*/ ##


# Global constants definition.
PROG=$(basename "$(realpath "$0")")			# Program name.
OPENGNSYS=/opt/opengnsys				# OpenGnsys main directory.
DOWNLOADDIR=$OPENGNSYS/lib				# Directory to store ogLive images.
DOWNLOADURL="https://opengnsys.es/trac/downloads"	# Download URL.
TFTPDIR=$OPENGNSYS/tftpboot				# TFTP directory.
DEFOGLIVE="ogLive"					# Default ogLive directory.
MINREL=20190601						# Mininum ogLive compatibility release.
INFOFILE=$OPENGNSYS/etc/ogliveinfo.json			# Configuration file.


# Auxiliar functions.

# Metafunction to check if JSON result exists.
function jq() {
    local OUTPUT
    OUTPUT=$($JQ "$@") || return $?
    [[ "$OUTPUT" = "null" ]] && return 1
    echo "$OUTPUT"
}

# Create/edit JSON file about installed ogLive clients.
function addToJson() {
    local DATA OGLIVEDIST="$1" OGLIVEKRNL="$2" OGLIVEARCH="$3" OGLIVEREV="$4"
    local OGLIVEDIR=$(basename $5 2>/dev/null) OGLIVEISO=$(basename $6 2>/dev/null)
    # JSON data for installed ogLive.
    DATA=$(cat << EOT | jq .
{"distribution":"$OGLIVEDIST","kernel":"$OGLIVEKRNL","architecture":"$OGLIVEARCH","revision":"$OGLIVEREV","directory":"$OGLIVEDIR","iso":"$OGLIVEISO"}
EOT
    )
    # Check JSON file consistency.
    if [ "$(jq -c keys $INFOFILE 2>/dev/null)" == '["default","oglive"]' ]; then
        # Check if ogLive is defined into JSON file.
        n=$(jq ".oglive | length" $INFOFILE)
        for ((i=0; i<n; i++)); do
            [ "$(jq ".check=$DATA | .check==.oglive[$i]" $INFOFILE)" == "true" ] && INDEX=$i
        done
        # Check if it needs to insert data.
        if [ -z "$INDEX" ]; then
            INDEX=$n
            jq ".oglive |= (. + [$DATA])" $INFOFILE | sponge $INFOFILE
        fi
        # Show JSON entry.
        jq ".oglive[$INDEX]" $INFOFILE
    else
        # Create new JSON file.
        cat << EOT | jq . | tee $INFOFILE
{"oglive":[$DATA],"default":0}
EOT
    fi
}

# Show an error message.
function raiseError() {
    case "$1" in
        usage)
            echo "$PROG: Usage error: Type \"$PROG help\"" >&2
            exit 1 ;;
        notfound)
            echo "$PROG: Resource not found: $2" >&2
            exit 2 ;;
        access)
            echo "$PROG: Access error: $2" >&2
            exit 3 ;;
        download)
            echo "$PROG: Download error: $2" >&2
            exit 4 ;;
        *)
            echo "$PROG: Unknown error" >&2
            exit 1 ;;
    esac
}

# Command functions.

# Show help message.
function help() {
    cat << EOT
$PROG: manage ogLive cleints.
Usage: $PROG command [options]
Commands:
  help                show this help
  config              show configuration parameters
  check               check system consistency
  convert             convert old ogclient to new default ogLive client
  list                list installed ogLive clients
  show all            show JSON information about all installed ogLive clients
  show default        show JSON information about ogLive client marked as default
  show Index|Dir      show JSON information about an installed ogLive client
  search Index|Dir    show corresponding index or directory
  download            show a menu to download an ogLive ISO image from the OpenGnsys website
  download Iso        download an specific ogLive ISO image from the OpenGnsys website
  install Iso         install a new ogLive client from a downloaded ISO image
  uninstall Iso       remove ISO image and uninstall its ogLive client
  uninstall Index|Dir uninstall an ogLive client
  get-default         get index value for default ogLive client
  set-default Index   set default ogLive client
  rebuild             rebuild a lost configuration file
  assign Iso Index    assign an ISO file to a JSON entry
Parameters:
  Index   a number, starting by 0
  Dir     directory (relative to installation directory)
  Iso     ISO file name (relative to download URL or download directory)
EOT
}

# Convert default ogclient to a new ogLive format.
function convert() {
    local OGCLIENT=ogclient OLDINFOFILE=$OPENGNSYS/doc/veroglive.txt
    local OGLIVEKRNL OGLIVEDIR OGLIVEISO
    [ $# -ne 0 ] && raiseError usage
    [ ! -w $(dirname $INFOFILE) ] && raiseError access "Configuration file."
    [ -n "$(stat -c "%N" $TFTPDIR/ogclient | awk '$3~/'$DEFOGLIVE'/ {print}')" ] && raiseError access "ogLive is already converted."
    pushd $TFTPDIR >/dev/null || raiseError access "Installation directory."
    [ ! -f $OGCLIENT/ogvmlinuz ] && raiseError notfound "ogclient"
    # Add entry to JSON file using ogclient kernel version.
    OGLIVEKRNL=$(file -bkr $OGCLIENT/ogvmlinuz | awk '/Linux/ {for(i=1;i<=NF;i++) if($i~/version/) {v=$(i+1);sub(/-.*/,"",v);print v}}')
    OGLIVEDIR=$DEFOGLIVE-$OGLIVEKRNL
    [ -r $OLDINFOFILE ] && OGLIVEISO="$(head -1 $OLDINFOFILE)"
    addToJson "$(echo $OGLIVEISO|cut -f2 -d-)" "$OGLIVEKRNL" "i386" "${OGLIVEISO##*-}" "$OGLIVEDIR" "$OGLIVEISO.iso"
    # Rename directory, link to default and clean old files.
    mv -v $OGCLIENT $OGLIVEDIR
    ln -vfs $OGLIVEDIR $DEFOGLIVE
    rm -f $OGCLIENT
    ln -vfs $DEFOGLIVE $OGCLIENT
    mv -v $OGCLIENT.old $OGLIVEDIR.old 2>/dev/null
    rm -fv {ogvmlinuz,oginitrd.img}{,.sum} $OLDINFOFILE
    popd >/dev/null
    # Delete old config file.
    rm -f $OLDINFOFILE
}

# Show script configuration parameters.
function config() {
    case $# in
        0)  # Show all parameters.
            cat << EOT
Configuration file:             $INFOFILE
ogLive download URL:            $DOWNLOADURL
ogLive download directory:      $DOWNLOADDIR
ogLive installation directory:  $TFTPDIR
Default ogLive name:            $DEFOGLIVE
Mainimum compatibility release: r$MINREL
EOT
            ;;
        1)  # Show specified parameter.
            case "$1" in
                config-file)    echo "$INFOFILE" ;;
                download-url)   echo "$DOWNLOADURL" ;;
                download-dir)   echo "$DOWNLOADDIR" ;;
                install-dir)    echo "$TFTPDIR" ;;
                default-name)   echo "$DEFOGLIVE" ;;
                min-release)    echo "r$MINREL" ;;
                *)              raiseError notfound "$1" ;;
            esac
            ;;
	*)  # Usage error.
            raiseError usage
            ;;
esac
}

# Check consistency, showing configuration problems.
function check() {
    local ERR=0 AUX INST DEF
    [ $# -ne 0 ] && raiseError usage
    # Check for old system that needs conversion.
    if [ -z "$(stat -c "%N" $TFTPDIR/ogclient | awk '$3~/'$DEFOGLIVE'/ {print}')" ]; then
         echo "This server uses old ogclient, please run \"$PROG convert\" to update."
         let ERR++
         [ ! -f $INFOFILE ] && return $ERR
    fi
    # Check for other problems.
    [ ! -f $INFOFILE ] && echo "Configuration file does not exists: $INFOFILE" && let ERR++
    [ -f $INFOFILE -a "$(jq -c keys $INFOFILE 2>/dev/null)" != "[\"default\",\"oglive\"]" ] && echo "Format error in configuration file: $INFOFILE" && let ERR++
    [ ! -e $TFTPDIR ] && echo "TFTP directory does not exist: $TFTPDIR." && let ERR++
    # Check for installed ogLive clients.
    INST=( $(find $TFTPDIR/ -type d -name "$DEFOGLIVE-*" -a ! -name "*.old" -printf "%f\n" | sort) )
    [[ ${#INST[@]} -eq 0 ]] && echo "No ogLive clients are installed." && let ERR++
    DEF=( $(jq -r .oglive[].directory $INFOFILE 2>/dev/null | sort) )
    # Compare installed and defined ogLive clients.
    AUX=$(comm -23 <(printf "%s\n" ${INST[*]}) <(printf "%s\n" ${DEF[*]}))
    [ -n "$AUX" ] && echo "Some ogLive are installed but not defined: ${AUX//$'\n'/, }" && let ERR++
    AUX=$(comm -13 <(printf "%s\n" ${INST[*]}) <(printf "%s\n" ${DEF[*]}))
    [ -n "$AUX" ] && echo "Some ogLive are defined but not installed: ${AUX//$'\n'/, }" && let ERR++
    # Compare downloaded and defined ISO images.
    INST=( $(find $DOWNLOADDIR/ -type f -name "$DEFOGLIVE-*.iso" -printf "%f\n" | sort) )
    DEF=( $(jq -r .oglive[].iso $INFOFILE 2>/dev/null | sort) )
    AUX=$(comm -23 <(printf "%s\n" ${INST[*]}) <(printf "%s\n" ${DEF[*]}))
    [ -n "$AUX" ] && echo "Some ISOs are downloaded but not defined: ${AUX//$'\n'/, }" && let ERR++
    AUX=$(comm -13 <(printf "%s\n" ${INST[*]}) <(printf "%s\n" ${DEF[*]}))
    [ -n "$AUX" ] && echo "Some ISOs are defined but not downloaded: ${AUX//$'\n'/, }" && let ERR++
    # Check for new ISO files downloaded after installation.
    AUX=$(jq -r '.oglive[] as $og | $og.iso + ":" + $og.directory' $INFOFILE 2>/dev/null | \
            while IFS=":" read -r DEF INST; do
                [ $DOWNLOADDIR/$DEF -nt $TFTPDIR/$INST ] && echo "$DEF"
            done)
    [ -n "$AUX" ] && echo "Some ISOs are downloaded after installation: ${AUX//$'\n'/, }" && let ERR++
    AUX=$(jq -r '.oglive[] as $og | if ($og.revision[1:9] | tonumber) < '$MINREL' then $og.directory else "" end' $INFOFILE 2>/dev/null)
    [ -n "$AUX" ] && echo "Some installed ogLive aren't fully compatible: ${AUX//$'\n'/, }" && let ERR++
    # Print result.
    [ $ERR -eq 0 ] && echo "OK!" || echo "Problems detected: $ERR"
    return $ERR
}

# List installed ogLive clients.
function list() {
    [ $# -ne 0 ] && raiseError usage
    [ ! -r $INFOFILE ] && raiseError access "Configuration file."
    # List all defined indexes, directories and check if missing.
    jq -r .oglive[].directory $INFOFILE | nl -v 0 | \
            awk '{system("echo -n "$0"; test -d '$TFTPDIR'/"$2" || echo -n \" (missing)\"; echo")}' | column -t
}

# Show information about an installed ogLive client. 
function show() {
    local INDEX
    [ $# -ne 1 ] && raiseError usage
    [ ! -r $INFOFILE ] && raiseError access "Configuration file."
    # Show JSON entries.
    case "$1" in
        default)    # Default index.
            INDEX="[$(jq -r .default $INFOFILE)]" ;;
        all)        # All intries.
            ;;
        [0-9]*)     # Index.
            INDEX="[$1]" ;;
        *)          # Directory.
            INDEX="[$(search "$1" 2>/dev/null)]" || raiseError notfound "Directory \"$1\"."
            ;;
    esac
    jq ".oglive$INDEX" $INFOFILE || raiseError notfound "Index \"$1\"."
}

# Show index or directory corresponding to searching parameter.
function search() {
    [ $# -ne 1 ] && raiseError usage
    [ ! -r $INFOFILE ] && raiseError access "Configuration file."
    # Show corresponding index or directory.
    list | awk -v d="$1" '{if ($2==d) print $1; if ($1==d) print $2}' | grep . || raiseError notfound "Index/Directory \"$1\""
}

# Show a menu to select and download an ogLive ISO image from the OpenGnsys website.
function download() {
    local OGLIVE NISOS i SOURCELENGTH TARGETFILE
    local ISOREL
    [ $# -gt 1 ] && raiseError usage
    [ ! -d $DOWNLOADDIR ] && raiseError notfound "Download directory"
    [ ! -w $DOWNLOADDIR ] && raiseError access "Download directory"
    # Check parameter.
    if [ -n "$1" ]; then
        # ogLive to download.
        OGLIVEFILE="$1"
    else
        # Show download menu.
        OGLIVE=( $(curl --silent $DOWNLOADURL | grep "$DEFOGLIVE.*iso") )
        NISOS=${#OGLIVE[@]}
        echo "Available downloads (+ = installed, * = full compatibility):"
        for i in $(seq 1 $NISOS); do
            [ -e $DOWNLOADDIR/${OGLIVE[i-1]} ] && OGLIVE[i-1]="(+) ${OGLIVE[i-1]}"
            ISOREL=${OGLIVE[i-1]##*-r}; ISOREL=${ISOREL%%.*}
            [ $ISOREL -ge $MINREL ] && OGLIVE[i-1]="(*) ${OGLIVE[i-1]}"
        done
        select opt in "${OGLIVE[@]}"; do
            [ -n "$opt" ] && OGLIVEFILE=${opt##* } && break
        done
    fi
    # Get download size.
    SOURCELENGTH=$(curl --head --silent $DOWNLOADURL/$OGLIVEFILE | awk -F: '/Content-Length:/ {print $2}')
    [ -n "$SOURCELENGTH" ] || raiseError download "$OGLIVEFILE"
    # Download ogLive.
    TARGETFILE=$DOWNLOADDIR/$OGLIVEFILE
    trap "rm -f $TARGETFILE" 1 2 3 6 9 15
    curl $DOWNLOADURL/$OGLIVEFILE -o $TARGETFILE || raiseError download "$OGLIVEFILE"
}

# Install an ogLive client from a previously downloaded ISO image.
function install() {
    local OGLIVEFILE OGLIVEDIST OGLIVEREV OGLIVEKRNL OGLIVEDIR OGINITRD OGSQFS OGCLIENT=ogclient
    local SAMBAPASS TMPDIR RSYNCSERV RSYNCCLNT
    [ $# -ne 1 ] && raiseError usage
    OGLIVEFILE=$(realpath $DOWNLOADDIR/$1)
    # Only 1 file in pathname expansion.
    [ $(echo $OGLIVEFILE | wc -w) -gt 1 ] && raiseError usage
    [ ! -f $OGLIVEFILE ] && raiseError notfound "Downloaded file: \"$1\"."
    [ ! -r $OGLIVEFILE ] && raiseError access "Downloaded file: \"$1\"."
    [ ! -w $(dirname $INFOFILE) ] && raiseError access "Configuration directory."
    [ ! -w $TFTPDIR ] && raiseError access "Installation directory."
    [ -z "$(file -b $OGLIVEFILE | grep "ISO.*ogClient")" ] && raiseError access "File is not an ogLive ISO image."
    # Working directory (ogLive-Distribution-KernelVersion-Architecture-CodeRevision).
    OGLIVEDIST="$(echo $OGLIVEFILE|cut -f2 -d-)"
    OGLIVEREV="${OGLIVEFILE##*-}"; OGLIVEREV="${OGLIVEREV%.*}"
    OGLIVEKRNL="$(echo $OGLIVEFILE|cut -f3- -d-)"; OGLIVEKRNL="${OGLIVEKRNL%-$OGLIVEREV.*}"
    OGLIVEARCH="$(echo $OGLIVEFILE|awk -F- '{print $(NF-1)}')"
    case "$OGLIVEARCH" in
        i386|amd64) # Get architecture.
            OGLIVEKRNL="${OGLIVEKRNL%-$OGLIVEARCH}" ;;
        *)          # 32-bit by default.
            OGLIVEARCH="i386" ;;
    esac
    OGLIVEDIR="$TFTPDIR/$DEFOGLIVE-$OGLIVEDIST-${OGLIVEKRNL%%-*}-$OGLIVEARCH-$OGLIVEREV"
    # Get current or default Samba key.
    OGINITRD=$OGLIVEDIR/oginitrd.img
    [ ! -r $OGINITRD ] && OGINITRD=$TFTPDIR/$DEFOGLIVE/oginitrd.img
    if [ -r $OGINITRD ]; then
    SAMBAPASS=$(gzip -dc $OGINITRD | \
    cpio -i --to-stdout scripts/ogfunctions 2>&1 | \
            grep "^[ 	].*OPTIONS=" | \
            sed 's/\(.*\)pass=\(\w*\)\(.*\)/\2/')
    fi
    # Make ogLive backup.
    rm -fr ${OGLIVEDIR}.old
    mv -fv $OGLIVEDIR ${OGLIVEDIR}.old 2>/dev/null
    # Mount ogLive ISO image, update its files and unmount it.
    TMPDIR=/tmp/${OGLIVEFILE%.iso}
    mkdir -p $OGLIVEDIR $TMPDIR
    trap "umount $TMPDIR; rm -fr $TMPDIR" 1 2 3 6 9 15
    mount -o loop,ro $OGLIVEFILE $TMPDIR
    cp -va $TMPDIR/ogclient/* $OGLIVEDIR || raiseError access "Cannot copy files to ogLive directory."
    umount $TMPDIR
    # Link to default directory if it's the first ogLive.
    if [ ! -f $INFOFILE ]; then
        rm -f $TFTPDIR/$DEFOGLIVE $TFTPDIR/$OGCLIENT
        ln -vfs $(basename $OGLIVEDIR) $TFTPDIR/$DEFOGLIVE
        ln -vfs $DEFOGLIVE $TFTPDIR/$OGCLIENT
    fi
    # Recover or ask for a new Samba access key.
    if [ -n "$SAMBAPASS" ]; then
        echo -ne "$SAMBAPASS\n$SAMBAPASS\n" | $OPENGNSYS/bin/setsmbpass "$(basename $OGLIVEDIR)"
    else
        $OPENGNSYS/bin/setsmbpass "$(basename $OGLIVEDIR)"
    fi
    # Set permissions.
    find -L $OGLIVEDIR -type d -exec chmod 755 {} \;
    find -L $OGLIVEDIR -type f -exec chmod 644 {} \;
    chown -R :opengnsys $OGLIVEDIR
    # Mount SquashFS and check Rsync version.
    OGSQFS=$OGLIVEDIR/ogclient.sqfs
    mount -o loop,ro $OGSQFS $TMPDIR
    # If Rsync server version > client version, link to compiled file.
    RSYNCSERV=$(rsync --version 2>/dev/null | awk '/protocol/ {print $6}')
    RSYNCCLNT=$(chroot $TMPDIR /usr/bin/rsync --version 2>/dev/null | awk '/protocol/ {print $6}')
    if [ -z "$RSYNCSERV" -o ${RSYNCSERV:-0} -gt ${RSYNCCLNT:-1} ]; then
        [ -e $OPENGNSYS/client/bin/rsync-$RSYNCSERV ] && mv -f $OPENGNSYS/client/bin/rsync-$RSYNCSERV $OPENGNSYS/client/bin/rsync
    else
	# Else, rename compiled file using Rsync protocol number.
        [ -e $OPENGNSYS/client/bin/rsync ] && mv -f $OPENGNSYS/client/bin/rsync $OPENGNSYS/client/bin/rsync-$($OPENGNSYS/client/bin/rsync --version 2>/dev/null | awk '/protocol/ {print $6}')
    fi
    # Unmount SquashFS.
    umount $TMPDIR
    rmdir $TMPDIR
    # Update JSON file.
    addToJson "$OGLIVEDIST" "$OGLIVEKRNL" "$OGLIVEARCH" "$OGLIVEREV" "$OGLIVEDIR" "$OGLIVEFILE"
}

# Uninstall an ogLive client.
function uninstall() {
    local ISO DIR INDEX DEFINDEX
    [ $# -ne 1 ] && raiseError usage
    [ ! -r $INFOFILE ] && raiseError access "Configuration file."
    [ ! -w $TFTPDIR ] && raiseError access "Installation directory."
    # Get index and directory for the entry.
    case "$1" in
        */*)    # Error (access to other directory).
            raiseError access "Cannot access outside installation directory."
            ;;
        *.iso)  # ISO file.
            ISO="$1"
            # Working directory (ogLive-Distribution-KernelVersion-CodeRevision).
            DIR="$(echo $ISO|cut -f1,3 -d-)-${ISO##*-}"; DIR=${DIR%.*}
            INDEX=$(search $DIR 2>/dev/null)
            ;;
        [0-9]*) # Index.
            INDEX=$1; DIR=$(search $INDEX 2>/dev/null)
            ;;
        *)      # Directory.
            DIR="$1"; INDEX=$(search $DIR 2>/dev/null)
            ;;
    esac
    DEFINDEX=$(getdefault)
    [[ $INDEX = $DEFINDEX ]] && raiseError access "Cannot uninstall default ogLive."
    # Remove files and delete index entry.
    rm -vfr ${ISO:+$DOWNLOADDIR/$ISO} ${DIR:+$TFTPDIR/$DIR}    ### Remove $TFTPDIR/$DIR.old ?
    if [ -n "$INDEX" ]; then
        jq "del(.oglive[$INDEX])" $INFOFILE | sponge $INFOFILE
        # Decrement default index if needed (removed < default).
        [[ $INDEX < $DEFINDEX ]] && jq ".default=$((DEFINDEX-1))" $INFOFILE | sponge $INFOFILE
    fi
}

# Get default ogLive index.
function getdefault() {
    [ $# -ne 0 ] && raiseError usage
    [ ! -r $INFOFILE ] && raiseError access "Configuration file."
    # Read default parameter.
    jq -r .default $INFOFILE || raiseError notfound "Undefined default index."
}

# Set default ogLive index.
function setdefault() {
    local INDEX OGLIVEDIR
    [ $# -ne 1 ] && raiseError usage
    [ ! -w $INFOFILE ] && raiseError access "Configuration file."
    INDEX=$1
    # Check if index entry exists.
    jq ".oglive[$INDEX]" $INFOFILE || raiseError notfound "Index \"$INDEX\"."
    # Get ogLive directory.
    OGLIVEDIR=$(jq -r ".oglive[$INDEX].directory" $INFOFILE) || raiseError notfound "Directory for index \"$INDEX\"."
    # Update default parameter.
    jq ".default=$INDEX" $INFOFILE | sponge $INFOFILE
    # Link to default directory.
    rm -f $TFTPDIR/$DEFOGLIVE
    ln -vfs $(basename $OGLIVEDIR) $TFTPDIR/$DEFOGLIVE
}

# Rebuild a lost configuration file.
function rebuild() {
    local INST i NF DEF
    [ $# -ne 0 ] && raiseError usage
    [ -f $INFOFILE ] && raiseError access "Configuration file exists."
    INST=$(find $TFTPDIR/ -type d -name "$DEFOGLIVE-*" -a ! -name "*.old" -printf "%f\n" | sort)
    for i in $INST; do
        NF=$(echo $i | awk -F- '{print NF-1}')
        case $NF in
            1)  addToJson "" "$(echo $i|cut -f2 -d-)" "i386" "" "$i" "" ;;
            4)  addToJson $(echo $i | awk -F- '{printf "%s %s i386 %s %s '""'",$2,$3,$4,$0}') ;;
            5)  addToJson $(echo $i | awk -F- '{printf "%s %s %s %s %s '""'",$2,$3,$4,$5,$0}') ;;
        esac
        # Check for is default oglive.
        [ -n "$(stat -c "%N" $TFTPDIR/$DEFOGLIVE | awk '$3~/'$i'/ {print}')" ] && DEF="$i"
    done
    # Set default ogLive.
    [ -n "$DEF" ] && setdefault $(search $DEF)
}

# Assign an ISO file to a JSON entry.
function assign() {
local ISOFILE DIR
    [ $# -ne 2 ] && raiseError usage
    [ ! -w $INFOFILE ] && raiseError access "Configuration file."
    # Check if exist ISO file and index directory.
    ISOFILE=$DOWNLOADFILE/$1
    [ ! -f $DOWNLOADDIR/$ISOFILE ] && raiseError notfound "ISO file \"$1\"."
    DIR=$(search $2 2>/dev/null)
    [ ! -d $TFTPDIR/$DIR ] && raiseError notfound "Directory for index \"$2\"."
    # Assign ISO file to JSON entry.
    jq ".oglive[$2].iso=\"$1\"" $INFOFILE | sponge $INFOFILE && jq ".oglive[$2]" $INFOFILE
}


# Main progrram.

# Access control.
[ -r $OPENGNSYS/www/controlacceso.php ] && ACCESS="web"
[ "$USER" = "root" ] && ACCESS="root"
[ -z "$ACCESS" ] && raiseError access "Need to be root."
# Check dependencies.
JQ=$(which jq 2>/dev/null) || raiseError notfound "Need to install \"jq\"."
which sponge &>/dev/null || raiseError notfound "Need to install \"moreutils\"."
# Commands control.
shopt -s extglob
case "$ACCESS" in
    root)   CMDS='+(help|convert|config|check|list|show|search|download|install|uninstall|get-default|set-default|rebuild|assign)' ;;
    web)    CMDS='+(list|show|search|get-default)' ;;
esac
case "$1" in
    $CMDS)  COMMAND="${1/-/}"; shift; $COMMAND "$@" ;;
    *)      raiseError usage ;;
esac

exit $?