#!/bin/bash
#  $HeadURL$ $LastChangedRevision$
set -e
PROGNAME=$(basename $0)

#  Load support functions
. $(pcms-config PCMS_SHARE_PREFIX)/scripts/support.sh

main()
{
    #  Defaults for options
    VERBOSELEVEL=2

    debug 10 "main: sof"

    #  Process options
    while [ $# -ge 1 ]; do
        case $1 in
            -d)              VERBOSELEVEL=$2; shift ;;
            --debug=*)       VERBOSELEVEL=${1#*=} ;;
            -v|--verbose)    VERBOSELEVEL=3 ;;
            --)              shift; break ;;
            -*)              error "main: $1: bad option" ;;
            *)               break ;;
        esac
        shift
    done

    #  Process arguments
    [ $# = 1 ] || usage
    debug 10 "main: calling [encode --decode \"$1\"] ..."
    eval set -- $(encode --decode "$1")
    debug 10 "main: \$#=$#"
    [ $# -ge 2 ] || usage
    LOGIN="$1"; shift
    CREATE_PASSWD_ENTRY_FLAG="$1"; shift

    debug 10 "main: LOGIN=$LOGIN, CREATE_PASSWD_ENTRY_FLAG=$CREATE_PASSWD_ENTRY_FLAG"
    [[ $CREATE_PASSWD_ENTRY_FLAG =~ ^(true|false)$ ]] || error "$CREATE_PASSWD_ENTRY_FLAG: invalid flag"

    if $CREATE_PASSWD_ENTRY_FLAG; then
        IS_SYSTEM_USER_FLAG="$1"
        FULL_NAME="$2"
        HOME_DIR="$3"
        shift 3
        debug 10 "main: IS_SYSTEM_USER_FLAG=$IS_SYSTEM_USER_FLAG, FULL_NAME=\"$FULL_NAME\", HOME_DIR=$HOME_DIR"
    
        #  Sanity checks and derivations
        [[ $IS_SYSTEM_USER_FLAG =~ ^(true|false)$ ]] || error "$IS_SYSTEM_USER_FLAG: invalid flag"
        if $IS_SYSTEM_USER_FLAG; then
            GROUPADD_OPTS="--system"
            USERADD_OPTS="--system --password '*'"
        else
            GROUPADD_OPTS=
            USERADD_OPTS="--password ''"
        fi
    
        #  Guts
        getent group $LOGIN > /dev/null || groupadd $GROUPADD_OPTS $LOGIN
        getent passwd $LOGIN > /dev/null || {
            #  In order to make code path simpler, don't create user's home yet; leave that 
            #  to code further down.
            eval "useradd $USERADD_OPTS -g $LOGIN -s /bin/bash -M $LOGIN"
            if ! $IS_SYSTEM_USER_FLAG; then
                chage -d 0 $LOGIN
            fi
        }
        [ "X$(getent passwd $LOGIN | cut -d: -f5 | cut -d, -f1)" = "X$FULL_NAME" ] || chfn -f "$FULL_NAME" $LOGIN; \
        [ "X$(getent passwd $LOGIN | cut -d: -f6)"               = "X$HOME_DIR"  ] || usermod -d $HOME_DIR $LOGIN 2>/dev/null || { echo "usermod failed for user $LOGIN" >&2; exit 1; }
    fi

    CREATE_HOME_DIR_FLAG="$1"; shift
    debug 10 "main: CREATE_HOME_DIR_FLAG=$CREATE_HOME_DIR_FLAG"
    [[ $CREATE_HOME_DIR_FLAG =~ ^(true|false)$ ]] || error "$CREATE_HOME_DIR_FLAG: invalid flag"

    if $CREATE_HOME_DIR_FLAG; then
        GET_HOME_FROM_PASSWD_FLAG="$1"; shift
        debug 10 "main: GET_HOME_FROM_PASSWD_FLAG=$GET_HOME_FROM_PASSWD_FLAG"
        if $GET_HOME_FROM_PASSWD_FLAG; then
            HOME_DIR=$(getent passwd $LOGIN | cut -d: -f6)
        else
            HOME_DIR="$1"; shift
        fi
        debug 10 "main: HOME_DIR=$HOME_DIR"
        mkdir -p $HOME_DIR
	chown $LOGIN:$LOGIN $HOME_DIR
    fi
}

usage() { echo "Usage: $PROGNAME <login>@<create-pwent-flag>[@...]@<create-home-flag>[@...]" >&2; exit 1; }

main "$@"