automountnfs

#!/bin/bash

AMN_SERVER_FQDN="lithium.alvaone.net"
AMN_TEMP_LOG="/var/log/automountnfs"
AMN_DATE_OPTS="%a %b %d %H:%M %Y"
AMN_CHECK=0
AMN_UNMOUNT=0

trap 'trap_abort' INT QUIT TERM HUP
trap 'trap_exit' EXIT

cleanup() {
	exit $1 || true
}

abort() {
	loge 'Aborting...'
	cleanup 0
}

trap_abort() {
	trap - EXIT INT QUIT TERM HUP
	abort
}

trap_exit() {
    log "Received exit..."
	trap - EXIT INT QUIT TERM HUP
	cleanup
}

log() {
    echo -e `date +"$AMN_DATE_OPTS"`": $1" >> $AMN_TEMP_LOG
}

loge() {
    echo -e `date +"$AMN_DATE_OPTS"`": ERROR: $1" >> $AMN_TEMP_LOG
}

logc() {
    echo -e `date +"$AMN_DATE_OPTS"`": Exec: $1" >> $AMN_TEMP_LOG
}

run_cmd() {
    # $1: command to run
    # $2: Redirection
    cmd=$1
    logc $cmd
    $cmd $2
}

usage() {
	echo "${0} - Auto Mount or Unmount NFS shares"
    echo
    echo "Usage: ${0} [options] (mount|unmount)"
    echo
    echo "Options:"
    echo
    echo "    -h:    Show help information."
    echo
    echo "Commands:"
    echo
    echo "    mount     Mount fstab nfs mounts"
    echo "    unmount   Unmount all fstab nfs mounts"
}

if [[ $# -lt 1 ]]; then
    usage;
    exit 0;
fi

log "AutoMountNFS started: $0::$$"

ARGS=("$@")
for (( a = 0; a < $#; a++ )); do
    if [[ ${ARGS[$a]} == "check" ]]; then
        log "Found check command argument"
        AMN_CHECK=1
    elif [[ ${ARGS[$a]} == "unmount" ]]; then
        log "Found unmount command argument"
        AMN_UNMOUNT=1
    elif [[ ${ARGS[$a]} == "-h" ]]; then
        usage;
        exit 0;
    fi
done

MOUNT_POINTS=$(sed -e '/^.*#/d' -e '/^.*:\//!d' -e 's/\t/ /g' /etc/fstab \
            | tr -s " " | cut -f2 -d" ")

unmount_all() {
    for umntpnt in ${MOUNT_POINTS}; do
        log "Unmounting $umntpnt"
        cmd="umount -l -f $umntpnt"
        logc "$cmd"
        $cmd 2>&1 >> $AMN_TEMP_LOG
        if [ $? -ne 0 ]; then
            loge "umounting failed! ($?)"
            continue
        fi
        log "umounted $umntpnt"
    done
}

mount_all() {
    for mount_point in ${MOUNT_POINTS}; do
        log "Processing point: $mount_point"
        if [[ $NFS_SHARES != *$mount_point* ]]; then
            log "$mount_point not provide by server!"
            continue
        fi
        cmd="mountpoint -q $mount_point"
        logc "$cmd"
        $cmd 2>&1 >> $AMN_TEMP_LOG
        if [ $? -ne 0 ]; then
            log "Mounting $mount_point"
            mount -v $mount_point >> $AMN_TEMP_LOG
            if [ $? -ne 0 ]; then
                loge "Mounting failed! ($?)"
                continue
            fi
            log "mounted $mount_point"
        fi
    done
}

if [[ "${AMN_CHECK}" -eq 1 ]]; then
    ping -c 1 "${AMN_SERVER_FQDN}" >> $AMN_TEMP_LOG
    if [ $? -ne 0 ]; then
        log "The server could not be reached."
        unmount_all
    else
        log "Asking the server for mountpoints"
        cmd="showmount -e $AMN_SERVER_FQDN"
        logc "$cmd"
        NFS_SHARES=`$cmd 2>>$AMN_TEMP_LOG | sed -e '/^\//!d' | cut -f1 -d" "; \
                    test ${PIPESTATUS[0]} -eq 0`
        smount_ret=$?
        if [ $smount_ret -ne 0 ]; then
            loge "No shares available from host! ($smount_ret)"
            exit;
        fi
        log "Server mount points:\n$NFS_SHARES"
        mount_all
    fi
fi

if [[ "${AMN_UNMOUNT}" -eq 1 ]]; then
    unmount_all
fi

# vim: ft=sh