37 lines
1 KiB
Bash
37 lines
1 KiB
Bash
#!/bin/sh
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# This is a NetworkManager dispatcher script for chronyd to set its NTP sources
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# online or offline when a network interface is configured or removed
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export LC_ALL=C
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[ "$2" != "up" ] && [ "$2" != "down" ] && exit 0
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# Check if there is a default route
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if /sbin/ip route list 2> /dev/null | grep -q '^default'; then
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chronyc online > /dev/null 2>&1
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exit 0
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fi
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sources=$(chronyc -c -n sources 2> /dev/null)
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[ $? -ne 0 ] && exit 0
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# Check each configured source if it has a route
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echo "$sources" | while IFS=, read mode state address rest; do
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[ "$mode" != '^' ] && [ "$mode" != '=' ] && continue
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/sbin/ip route get "$address" > /dev/null 2>&1 && command="online" || command="offline"
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# Set priority of sources so that the selected source is set as
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# last if offline to avoid unnecessary reselection
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[ "$state" != '*' ] && priority=1 || priority=2
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echo "$priority $command $address"
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done | sort | while read priority command address; do
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echo "$command $address"
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done | chronyc > /dev/null 2>&1
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exit 0
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