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macscript: create file if it doesn't exist.

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This commit is contained in:
Simon Kelley
2013-09-27 21:07:30 +01:00
parent 42b44a591b
commit 10bd29265b
1 changed files with 20 additions and 14 deletions
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18
contrib/mactable/macscript
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@@ -11,20 +11,26 @@ action="$1"
mac="$2" # IPv4 mac="$2" # IPv4
ip="$3" ip="$3"
# ensure it always exists.
if [ ! -f "$STATUS_FILE" ]; then
touch "$STATUS_FILE"
fi
if [ -n "$DNSMASQ_IAID" ]; then if [ -n "$DNSMASQ_IAID" ]; then
if [ -z "$DNSMASQ_MAC" -a "$action" = "old" ]; then
# MAC not known by dnsmasq, probably due to restart.
exit 0;
fi
mac="$DNSMASQ_MAC" # IPv6 mac="$DNSMASQ_MAC" # IPv6
fi fi
# worry about an add or old action when the MAC address is not known:
# leave any old one in place in that case.
if [ "$action" = "add" -o "$action" = "old" -o "$action" = "del" ]; then if [ "$action" = "add" -o "$action" = "old" -o "$action" = "del" ]; then
if [ -f "$STATUS_FILE" ]; then if [ -n "$mac" -o "$action" = "del" ]; then
sed "/^${ip//./\.} / d" "$STATUS_FILE" > "$STATUS_FILE".new sed "/^${ip//./\.} / d" "$STATUS_FILE" > "$STATUS_FILE".new
fi
if [ "$action" = "add" -o "$action" = "old" ]; then if [ "$action" = "add" -o "$action" = "old" ]; then
echo "$ip $mac" >> "$STATUS_FILE".new echo "$ip $mac" >> "$STATUS_FILE".new
fi fi
mv "$STATUS_FILE".new "$STATUS_FILE" # atomic update. mv "$STATUS_FILE".new "$STATUS_FILE" # atomic update.
fi
fi fi