#!/bin/bash

#/**
#@file    oglivecli
#@brief   Command line tool to manage ogLive clients.
#@usage   oglivecli Command [Options ...]
#@param   Command:
#@param     help                show this help
#@param     version             show script version
#@param     config [Parameter]  show configuration parameters
#@param     check               check system consistency
#@param     convert             convert old ogclient to new default ogLive client
#@param     list                list installed ogLive clients
#@param     show all            show JSON information about all installed ogLive clients
#@param     show default        show JSON information about ogLive client marked as default
#@param     show Index|Dir      show JSON information about an installed ogLive client
#@param     search Index|Dir    show corresponding index or directory
#@param     download            show a menu to download an ogLive ISO image from the OpenGnsys website
#@param     download Iso        download an specific ogLive ISO image from the OpenGnsys website
#@param     install Iso         install a new ogLive client from a downloaded ISO image
#@param     uninstall Iso       remove ISO image and uninstall its ogLive client
#@param     uninstall Index|Dir uninstall an ogLive client
#@param     get-default         get index value for default ogLive client
#@param     set-default Index   set default ogLive client
#@param     rebuild             rebuild a lost configuration file
#@param     assign Iso Index    assign an ISO file to a JSON entry
#@param   Options:
#@param     Index   a number, starting by 0
#@param     Dir     directory (relative to installation directory)
#@param     Iso     ISO file name (relative to download URL or download directory)
#@warning This script needs "jq" command.
#@version 1.1.0 - Initial version.
#@author  Ramón M. Gómez - ETSII Univ. Sevilla
#@date    2016-12-05
#@version 1.1.1b - Use reduced directory names.
#@author  Ramón M. Gómez - ETSII Univ. Sevilla
#@date    2020-01-17
#*/ ##


# 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.


# Global and secondary functions.

source $OPENGNSYS/lib/ogfunctions.sh || exit 1

# Create/edit JSON file about installed ogLive clients.
function addToJson() {
    local i 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
}

# Command functions.

# 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() {
    local DATA
    DATA=$(cat << EOT
[
  { "param": "config-file", "description": "Configuration file", "value": "$INFOFILE" },
  { "param": "download-url", "description": "ogLive download URL", "value": "$DOWNLOADURL" },
  { "param": "download-dir", "description": "ogLive download directory", "value": "$DOWNLOADDIR" },
  { "param": "install-dir", "description": "ogLive installation directory", "value": "$TFTPDIR" },
  { "param": "default-name", "description": "Default ogLive name", "value": "$DEFOGLIVE" },
  { "param": "min-release", "description": "Mainimum compatibility release", "value": "r$MINREL" }
]
EOT
    )
    case $# in
        0)  # Show all parameters.
            echo $DATA | jq -r '.[] | .description + " (" + .param+ ")," + .value' | column -ts,
            ;;
        1)  # Show specified parameter.
            DATA=$(echo $DATA | jq -r ".[] | select(.param==\"$1\").value")
            [ "$DATA" ] || raiseError notfound "\"$1\"."
            echo "$DATA"
            ;;
        *)  # 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++
    DEF=$(jq -r ".oglive[$(getdefault)].directory" $INFOFILE 2>/dev/null)
    INST=$(stat -c "%N" $TFTPDIR/$DEFOGLIVE | cut -f4 -d\')
    [ "$DEF" != "$INST" ] && echo "Default ogLive is not linked to right directory: $DEF <> $INST" && 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 HTTPCODE 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.
    HTTPCODE=$(curl --head --silent $DOWNLOADURL/$OGLIVEFILE | awk '/HTTP\// {print $2}')
    [ "$HTTPCODE" != "200" ] && raiseError download "\"$OGLIVEFILE\"."
    # Download ogLive.
    TARGETFILE=$DOWNLOADDIR/$OGLIVEFILE
    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 COMPRESS 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 $OGLIVEFILE | grep "ISO.*ogClient")" ] && raiseError access "File is not an ogLive ISO image."
    # Working directory:
    #   64-bit: ogLive-KernelVersion-rCodeRelease
    #   32-bit: ogLive-KernelVersion-i386-rCodeRelease
    OGLIVEDIST="$(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-${OGLIVEKRNL%%-*}-$OGLIVEARCH-$OGLIVEREV"
    OGLIVEDIR="${OGLIVEDIR/amd64-/}"
    # Get current or default Samba key.
    OGINITRD=$OGLIVEDIR/oginitrd.img
    [ ! -r $OGINITRD ] && OGINITRD=$TFTPDIR/$DEFOGLIVE/oginitrd.img
    if [ -r $OGINITRD ]; then
        COMPRESS=$(file -b "$OGINITRD" | awk '{print tolower($1);}')
        SAMBAPASS=$($COMPRESS -dc $OGINITRD | \
            cpio -i --to-stdout scripts/ogfunctions 2>&1 | \
            sed -n '/^[ 	].*OPTIONS=/s/.*pass=\(\w*\).*/\1/p')
    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 i INST 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" "" ;;
            2)  eval addToJson $(echo $i | awk -F- '{printf "\"\" %s amd64 %s %s \"\"",$2,$3,$0}') ;;
            3)  eval addToJson $(echo $i | awk -F- '{if ($3=="i386") printf "\"\" %s %s %s %s \"\"",$2,$3,$4,$0; else printf "%s %s i386 %s %s \"\"",$2,$3,$4,$0}') ;;
            4)  eval 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 $INFOFILE ] && raiseError access "Configuration file."
    # Check if ISO file and index directory exist.
    ISOFILE=$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 "$ACCESS" ] && raiseError access "Need to be root."
# Check dependencies.
which sponge &>/dev/null || raiseError notfound "Need to install \"moreutils\"."
# Commands control.
shopt -s extglob
case "$ACCESS" in
    root)   CMDS='+(help|version|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; $COMMAND "$@" ;;
    *)      echo "You need to be root to run this command." && exit 1 ;;
esac

exit $?