$ cat /opt/ltsp/i386test1/usr/share/ldm/rc.d/X01-localapps
#
# The following is a script to set up local apps support on LTSP through LDM
#

# This hook modifies /etc/group and /etc/passwd directly with user/group
# information gathered from the server.

# This will enable us to easily bypass the need for setting up local user
# authentication, and instead leverage the authentication already set up on
# the server.

if boolean_is_true "$LOCAL_APPS"; then

    echo "HEREONE:" >> /var/log/ldm.log
    printenv >> /var/log/ldm.log
    id >> /var/log/ldm.log
    echo "HERETWO:" >> /var/log/ldm.log
    # Set up local uids/gids

    LOCALAPPS_CACHE=/var/cache/ltsp-localapps
    export LOCALAPPS_CACHE
    mkdir -p ${LOCALAPPS_CACHE} 2>/dev/null

    # Copy /etc/passwd and /etc/group to cache if it does not exist (should only happen on first login)
    for i in passwd group; do
        if [ ! -e "${LOCALAPPS_CACHE}/${i}" ]; then
            cp /etc/${i} "${LOCALAPPS_CACHE}/${i}"
        else
            cp "${LOCALAPPS_CACHE}/${i}" /etc/${i}
        fi
    done

    # Get logged in username if not set
    [ -z "$LDM_USERNAME" ] && LDM_USERNAME=$(ssh -S ${LDM_SOCKET} ${LDM_SERVER} 'echo ${USER}')

    # Get passwd info *just* for that user
    ssh -S ${LDM_SOCKET} ${LDM_SERVER} "/usr/bin/getent passwd ${LDM_USERNAME}" | sed -e "s/${LDM_USERNAME}/${LDM_USERNAME}/i" >>/etc/passwd

    # Get all group info and copy to COMBINED_GROUP
    COMBINED_GROUP=${LOCALAPPS_CACHE}/group.combined
    cp /etc/group ${COMBINED_GROUP}
    ssh -S ${LDM_SOCKET} ${LDM_SERVER} "/usr/bin/getent group" >> ${COMBINED_GROUP}

    # Get the system groups that the user belongs to, so we can add him back in
    myGroups=$(ssh -S ${LDM_SOCKET} ${LDM_SERVER} /usr/bin/getent group|egrep "[,:]${LDM_USERNAME}(,|$)"|cut -d: -f1| tr '\n' ',' | sed -e 's/,$//g')

    # (/usr/bin/id is only needed because getent evidently does not return groups
    # added by pam_group (bug in pam_group?)

    myGroups1=$(ssh -S ${LDM_SOCKET} ${LDM_SERVER} LANG=C /usr/bin/id | sed -e 's/^.*groups=//' -e 's/) .*$/)/'|cut -d= -f2|sed -e 's/[0-9]*(//g' -e 's/)//g')

    # concatenate groups from different sources, stripping off prefixed and
    # trailing commas
    myGroups=$(echo ${myGroups},${myGroups1} | sed -e 's/^,//g' -e 's/,$//g')

    # Get the user's groups specifically (in case they weren't returned by "getent group")
    myGroups_quoted=$(echo $myGroups | sed -e "s/^/\\\'/" -e "s/$/\\\'/" -e "s/,/\\\' \\\'/g")
    ssh -S ${LDM_SOCKET} ${LDM_SERVER} LANG=C eval getent group ${myGroups_quoted} >> ${COMBINED_GROUP}
    unset myGroups_quoted

    # Now, some groups may have different gids on the server than the client chroot
    # So, let's prune out all the dups
    TMPGROUP="${LOCALAPPS_CACHE}/tmpgroup"
    [ -f "${TMPGROUP}" ] && rm ${TMPGROUP}
    gnames=""
    gids=""
    # those 2 variables are there because if group is rejected because of the gid we need to create this group.
    dgnames=""
    ngids=""

    oldifs="${IFS-not set}"
    IFS=":"
    while read gname gpass gid gusers; do
        match=
        case $gnames in
            *:"$gname":*|*:"$gname")
                # group name present in the list of groups already processed.
                match=1
                case $gusers in
                    "$LDM_USERNAME"|*,"$LDM_USERNAME",*|*,"$LDM_USERNAME"|"$LDM_USERNAME",*)
                        dgnames="$dgnames $gname,"
                        ;;
                esac
                ;;
        esac
        case $gids in
            *:"$gid":*|*:"$gid")
                # gid present in the list of gids already processed.
                match=1
                case $gusers in
                    "$LDM_USERNAME"|*,"$LDM_USERNAME",*|*,"$LDM_USERNAME"|"$LDM_USERNAME",*)
                        ngids="$ngids $gname,"
                        ;;
                esac
                ;;
        esac
        if [ -z "$match" ]; then
            echo "$gname:$gpass:$gid:$gusers" >>${TMPGROUP}
            gnames="$gnames:$gname"
            gids="$gids:$gid"
        fi
    done < ${COMBINED_GROUP}
    test "$oldifs" = "not set" && unset IFS || IFS="$oldifs"
    # cleanup
    dgnames=$(echo ${dgnames} | tr ',' '\n' | sort -u | tr '\n' ',' | sed 's/,$//')
    ngids=$(echo ${ngids} | tr ',' '\n' | sort -u | tr '\n' ',' | sed 's/,$//')
    tocreate=""
    oldifs="${IFS-not set}"
    IFS=,
    for e in $ngids; do
        match=
        for f in $dgnames; do
            if [ "$e" = "$f" ]; then
                match=1
            fi
        done
        if [ -z "$match" ]; then
            tocreate="$tocreate $e,"
        fi
    done
    tocreate=$(echo ${tocreate} | tr ',' '\n' | sort -u | tr '\n' ',' | sed 's/,$//' | sed 's/^[[:blank:]]*//g')
    test "$oldifs" = "not set" && unset IFS || IFS="$oldifs"

    cp ${TMPGROUP} /etc/group
    chmod 644 /etc/group


    if [ -n "$myGroups" ]; then
        if [ -w /etc ]; then
            oldifs="${IFS-not set}"
            IFS=,
            for ngroup in $tocreate; do
                ngroup=$(echo ${ngroup} | sed -e 's/ /\\\ /g') # FIXME: Problem with AD. Space not permited here.
                groupadd -r ${ngroup}
            done
            test "$oldifs" = "not set" && unset IFS || IFS="$oldifs"
            for group in $(echo ${myGroups} | tr ',' '\n' | sort -u); do
                /usr/sbin/usermod -a -G $group "${LDM_USERNAME}" 2>/dev/null
            done
        else
            # FIXME: maybe add system groups: $tocreate into /etc/group
            # Read-only /etc cannot use usermod
            myGroups=$(echo ${myGroups} | tr ',' '\n' | sort -u | tr '\n' ',' | sed 's/,$//')
            oldifs="${IFS-not set}"
            IFS=,
            cp /etc/group $TMPGROUP
            for group in $myGroups ; do
                # add user to each group manually
                line="$(egrep ^${group}: $TMPGROUP | egrep -v [:,]${LDM_USERNAME}'(,|$)' )"
                if [ -n "$line" ]; then
                    # add the user to the group
                    sed -i -e "s/^$line/$line,${LDM_USERNAME}/g" -e 's/:,/:/g' $TMPGROUP
                fi
            done
            cp $TMPGROUP /etc/group
            test "$oldifs" = "not set" && unset IFS || IFS="$oldifs"
        fi
    fi

    # Now, let's mount the home directory
    oldifs="${IFS-not set}"
    IFS=":"
    export LDM_HOME=""
    export USER_UID=""
    export USER_GID=""
    TMP_USER_PASSWD=${LOCALAPPS_CACHE}/passwd.user
    getent passwd ${LDM_USERNAME} > ${TMP_USER_PASSWD}
    while read user pass uid gid gecos home shell ; do
        # First, make the mountpoint
        LDM_HOME="$home"
        USER_UID="$uid"
        USER_GID="$gid"
        mkdir -p ${LDM_HOME}
        chown "$USER_UID":"$USER_GID" ${LDM_HOME}
        if [ -n "${XAUTHORITY_DIR}" ]; then
            chown "$USER_UID":"$USER_GID" ${XAUTHORITY_DIR}
        fi
    done < ${TMP_USER_PASSWD}
    test "$oldifs" = "not set" && unset IFS || IFS="$oldifs"
    rm ${TMP_USER_PASSWD}

    ## Maybe do this:
    ## export HOME=${LOCALAPPS_CACHE}

    if boolean_is_true "$SSH_FOLLOW_SYMLINKS" || [ -z "$SSH_FOLLOW_SYMLINKS" ]; then
        SSH_FOLLOW_SYMLINKS="follow_symlinks,"
    else
        unset SSH_FOLLOW_SYMLINKS
    fi
    # Mount the home directory
    sshfs -o ${SSH_FOLLOW_SYMLINKS}allow_other,ControlPath=${LDM_SOCKET} ${LDM_SERVER}:${LDM_HOME} ${LDM_HOME}

    echo "WTFONE:" >> /var/log/ldm.log
    printenv >> /var/log/ldm.log
    id >> /var/log/ldm.log
    echo "WTFTWO:" >> /var/log/ldm.log
    # Mount other directories
    if [ -n "${LOCAL_APPS_EXTRAMOUNTS}" ]; then
        oldifs="${IFS-not set}"
        IFS=","
        for extradir in ${LOCAL_APPS_EXTRAMOUNTS}; do
            mkdir -p "${extradir}"
            sshfs -o ${SSH_FOLLOW_SYMLINKS}allow_other,ControlPath=${LDM_SOCKET} ${LDM_SERVER}:${extradir} ${extradir}
        done
        test "$oldifs" = "not set" && unset IFS || IFS="$oldifs"
    fi

    # Create tmpdir for localapps menu
    if boolean_is_true "$LOCAL_APPS_MENU" && [ -x "/usr/bin/ltsp-genmenu" ]; then
        # get a temporary directory on the server
        TMP_XDG_MENU="$(ssh -S ${LDM_SOCKET} ${LDM_SERVER} mktemp -d /tmp/ltsp-localapps-${LDM_USERNAME}-XXXXXX)"
        export TMP_XDG_MENU
        CLIENT_ENV="${CLIENT_ENV} XDG_DATA_DIRS=${TMP_XDG_MENU}/:/usr/local/share/:/usr/share/"

        # Make the local temporary directory
        TMP_XDG_DIR_LOCAL="$(mktemp -d /tmp/ltsp-localapps-${LDM_USERNAME}-XXXXXX)"
        export TMP_XDG_DIR_LOCAL

        # chown the tmpdir to be owned by the user
        chown -R $USER_UID:$USER_GID ${TMP_XDG_DIR_LOCAL}

        # Generate the localapp menu
        su - ${LDM_USERNAME} -c "LOCAL_APPS_MENU_ITEMS=${LOCAL_APPS_MENU_ITEMS} TMP_XDG_DIR_LOCAL=${TMP_XDG_DIR_LOCAL} /usr/bin/ltsp-genmenu install"

        # now, scp the directory to the /tmp dir on the server
        scp -r -o "ControlPath $LDM_SOCKET" -o "User $LDM_USERNAME" ${TMP_XDG_DIR_LOCAL}/* ${LDM_SERVER}:${TMP_XDG_MENU}

        # Clean up local
        rm -rf ${TMP_XDG_DIR_LOCAL} || true
    fi

    # attempt to create cups dir if not present
    if [ ! -d /etc/cups ]; then
        mkdir /etc/cups || true
    fi

    # if cups is installed in the chroot, use LDM_SERVER for printing
    if [ -d /etc/cups ]; then
        if [ -n "${CUPS_SERVER}" ]; then
            echo "ServerName ${CUPS_SERVER}" > /etc/cups/client.conf
        else
            echo "ServerName ${LDM_SERVER}" > /etc/cups/client.conf
        fi
    fi

fi