nginx-proxy-manager/docker/rootfs/etc/s6-overlay/s6-rc.d/prepare/40-dynamic.sh

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#!/command/with-contenv bash
# shellcheck shell=bash
set -e
log_info 'Dynamic resolvers ...'
DISABLE_IPV6=$(echo "${DISABLE_IPV6:-}" | tr '[:upper:]' '[:lower:]')
# Dynamically generate resolvers file, if resolver is IPv6, enclose in `[]`
# thanks @tfmm
if [ "$DISABLE_IPV6" == "true" ] || [ "$DISABLE_IPV6" == "on" ] || [ "$DISABLE_IPV6" == "1" ] || [ "$DISABLE_IPV6" == "yes" ];
then
echo resolver "$(awk 'BEGIN{ORS=" "} $1=="nameserver" { sub(/%.*$/,"",$2); print ($2 ~ ":")? "["$2"]": $2}' /etc/resolv.conf) ipv6=off valid=10s;" > /etc/nginx/conf.d/include/resolvers.conf
else
echo resolver "$(awk 'BEGIN{ORS=" "} $1=="nameserver" { sub(/%.*$/,"",$2); print ($2 ~ ":")? "["$2"]": $2}' /etc/resolv.conf) valid=10s;" > /etc/nginx/conf.d/include/resolvers.conf
fi