just check the uplink

bash/ethlnkchk

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+if [ "$( /usr/bin/id --user )" -ne 0 ] ; then
+  printf "U have to be root\\!"
+  exit 1
+fi
+
+if [ ! -x "/sbin/ethtool" ] ; then
+  printf "U have to install ethtool first\\!"
+  exit 2
+fi
+
+ETH="eth0"
+CNT=0
+
+while true ; do
+  if ! /sbin/ethtool "${ETH}" 2>/dev/null | /bin/grep "Link detected: yes" 1>/dev/null ; then
+    (( CNT++ ))
+  else
+    CNT=0
+  fi
+  if [ "${CNT}" -gt 6 ] ; then /home/pi/bin/sesame close ; fi
+  sleep 6
+done
+
+exit 0

bash/sesame

@@ -0,0 +1,101 @@
+#!/bin/bash
+
+# DESCRIPTION:
+#
+# Open and mount dm_crypt container the easy way.
+
+
+# USAGE:
+#
+# sesame open
+#   or
+# sesame close
+
+
+# PREPARATIONS:
+#
+# cd
+# dd if=/dev/urandom of=./secrets.dd bs=4096 count=65536
+# sudo aptitude install cryptsetup
+# sudo losetup /dev/loop0 ./secrets.dd
+# sudo cryptsetup luksFormat /dev/loop0
+# sudo cryptsetup luksOpen /dev/loop0 ./secrets
+# sudo mkfs.ext4 -L secrets /dev/mapper/secrets
+# mkdir secrets
+# sudo mount /dev/mapper/secrets ./secrets
+# sudo chown -R pi:pi ./secrets
+# touch ./secrets/test
+# sudo umount /dev/mapper/secrets
+# sudo cryptsetup luksClose secrets
+# sudo losetup -d /dev/loop0
+
+
+readonly NAME="secrets"
+readonly CONTAINER="/home/pi/${NAME}.dd"
+readonly MOUNTPOINT="/home/pi/${NAME}"
+
+case "${1}" in
+  open)
+    if [ ! -f "${CONTAINER}" ] ; then
+      printf "ERROR: container file is missing - EXIT!\n"
+      exit 1
+    fi
+
+    if ! losetup -a | grep -F "${CONTAINER}" > /dev/null 2>&1 ; then
+      sudo losetup $( losetup -f ) "${CONTAINER}"
+    else
+      printf "NOTICE: the container has already been looped.\n"
+    fi
+
+    readonly LOOPDEVICE="$( losetup -a | grep -F "${CONTAINER}" | cut -d ":" -f 1 )"
+
+    if ! sudo cryptsetup status "${NAME}" | grep -F "/dev/mapper/${NAME} is active" > /dev/null 2>&1 ; then
+      sudo cryptsetup luksOpen "${LOOPDEVICE}" "${NAME}"
+    else
+      printf "NOTICE: ${CONTAINER} has already been opened.\n"
+    fi
+
+    if [ ! -d "${MOUNTPOINT}" ] ; then
+      mkdir "${MOUNTPOINT}"
+      printf "NOTICE: I have created the mountpoint for you.\n"
+    fi
+
+    if ! grep "/dev/mapper/${NAME}" /proc/mounts > /dev/null 2>&1 ; then
+      sudo mount "/dev/mapper/${NAME}" "${NAME}"
+    else
+      printf "NOTICE: open container has already been mounted.\n"
+    fi
+    ;;
+  close)
+    if grep "/dev/mapper/${NAME}" /proc/mounts > /dev/null 2>&1 ; then
+      sudo umount "/dev/mapper/${NAME}" 2> /dev/null
+      if [ "${?}" -ne 0 ] ; then
+        printf "ERROR: container could not be unmounted - EXIT!\n"
+        exit 1
+      fi
+    else
+      printf "NOTICE: open container has not been mounted.\n"
+    fi
+
+    if sudo cryptsetup status "${NAME}" | grep -F "/dev/mapper/${NAME} is active" > /dev/null 2>&1 ; then
+      sudo cryptsetup luksClose "${NAME}"
+    else
+      printf "NOTICE: ${CONTAINER} has not been opened.\n"
+    fi
+
+    readonly LOOPDEVICE="$( losetup -a | grep -F "${CONTAINER}" | cut -d ":" -f 1 )"
+
+    if [ -n "${LOOPDEVICE}" ] ; then
+      sudo losetup -d "${LOOPDEVICE}"
+    else
+      printf "NOTICE: the container has not been looped.\n"
+    fi
+
+    ;;
+  *)
+    printf "ERROR: I do not understand you - EXIT!\n"
+    exit 1
+
+esac
+
+exit 0