98 lines
2.6 KiB
Plaintext
98 lines
2.6 KiB
Plaintext
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#! /bin/bash
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#
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# nfs - start NFS in response to interface change
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#
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# Bastian Senst <bholst@lusku.de>
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function net_umount {
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umount -l -f $1 &>/dev/null
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}
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function net_mount {
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mountpoint -q $1 || mount $1
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}
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function test_reach {
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if [ "$(ip link show up $1)" = "" ]; then
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return 1
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else
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ping -n -c1 -w2 -I "$1" "$2" 2>&1 > /dev/null
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fi
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}
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DEVICE="$1"
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COMMAND="$2"
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function test_other_reaches {
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for other in $(ls /sys/class/net); do
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if [[ "$other" != "$DEVICE" ]]; then
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if test_reach "$other" "$1"; then
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return 0
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fi
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fi
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done
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return 1
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}
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declare -A reaches
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function other_reaches {
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if [[ "${reaches[$1]-}" == "yes" ]]; then
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return 0
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elif [[ "${reaches[$1]-}" == "no" ]]; then
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return 1
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else
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if test_other_reaches $1; then
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reaches[$1]="yes"
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return 0
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else
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reaches[$1]="no"
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return 1
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fi
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fi
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}
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NET_MOUNTS=$(sed -e '/^.*#/d' -e '/^.*:/!d' -e 's/\t/ /g' -e '/x-systemd.automount/d' /etc/fstab | tr -s " ")$'\n'
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case "$COMMAND" in
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up|dhcp4-change|dhcp6-change)
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# Check with systemd if nfs service is enabled
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if /usr/bin/systemctl is-enabled nfs-client.target >/dev/null 2>&1; then
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printf %s "$NET_MOUNTS" | while IFS= read -r line; do
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MOUNT_OPTIONS=$(echo $line | cut -f4 -d" ")
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MOUNT_POINT=$(echo $line | cut -f2 -d" ")
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FS_TYPE=$(echo $line | cut -f3 -d" ")
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# Only mount it if not "noauto "set in options
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case ",${MOUNT_OPTIONS}," in
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*,noauto,*) continue ;;
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esac
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# Only mount it when the type is nfs or nfs4
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if [ "$FS_TYPE" == "nfs" -o "$FS_TYPE" == "nfs4" ]; then
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net_mount "$MOUNT_POINT"
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fi
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done
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fi
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;;
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pre-down|down|vpn-pre-down)
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printf %s "$NET_MOUNTS" | while IFS= read -r line; do
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[[ $line ]] || continue
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MOUNT_POINT=$(echo $line | cut -f2 -d" ")
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FS_TYPE=$(echo $line | cut -f3 -d" ")
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HOST=$(echo $line | cut -f1 -d":")
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if other_reaches $HOST; then
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echo >&2 "Other network interfaces reach $HOST for $MOUNT_POINT."
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else
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# Only unmount it when the type is nfs or nfs4
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if [ "$FS_TYPE" == "nfs" -o "$FS_TYPE" == "nfs4" ]; then
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net_umount "$MOUNT_POINT"
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fi
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fi
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done
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exit 0
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;;
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*)
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exit 0
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;;
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esac
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