104 lines
2.1 KiB
Bash
104 lines
2.1 KiB
Bash
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#!/bin/sh
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usage() {
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echo "$0 [-f FLANNEL-ENV-FILE] [-d DOCKER-ENV-FILE] [-i] [-c] [-m] [-k COMBINED-KEY]
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Generate Docker daemon options based on flannel env file
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OPTIONS:
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-f Path to flannel env file. Defaults to /run/flannel/subnet.env
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-d Path to Docker env file to write to. Defaults to /run/docker_opts.env
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-i Output each Docker option as individual var. e.g. DOCKER_OPT_MTU=1500
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-c Output combined Docker options into DOCKER_OPTS var
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-k Set the combined options key to this value (default DOCKER_OPTS=)
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-m Do not output --ip-masq (useful for older Docker version)
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" >&2
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exit 1
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}
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flannel_env="/run/flannel/subnet.env"
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docker_env="/run/docker_opts.env"
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combined_opts_key="DOCKER_OPTS"
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indiv_opts=false
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combined_opts=false
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ipmasq=true
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while getopts "f:d:icmk:?h" opt; do
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case $opt in
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f)
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flannel_env=$OPTARG
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;;
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d)
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docker_env=$OPTARG
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;;
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i)
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indiv_opts=true
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;;
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c)
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combined_opts=true
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;;
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m)
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ipmasq=false
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;;
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k)
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combined_opts_key=$OPTARG
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;;
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[\?h])
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usage
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;;
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esac
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done
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if [ $indiv_opts = false ] && [ $combined_opts = false ]; then
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indiv_opts=true
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combined_opts=true
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fi
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if [ -f "$flannel_env" ]; then
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. $flannel_env
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fi
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if [ -n "$FLANNEL_SUBNET" ]; then
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DOCKER_OPT_BIP="--bip=$FLANNEL_SUBNET"
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fi
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if [ -n "$FLANNEL_MTU" ]; then
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DOCKER_OPT_MTU="--mtu=$FLANNEL_MTU"
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fi
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if [ -n "$FLANNEL_IPMASQ" ] && [ $ipmasq = true ] ; then
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if [ "$FLANNEL_IPMASQ" = true ] ; then
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DOCKER_OPT_IPMASQ="--ip-masq=false"
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elif [ "$FLANNEL_IPMASQ" = false ] ; then
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DOCKER_OPT_IPMASQ="--ip-masq=true"
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else
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echo "Invalid value of FLANNEL_IPMASQ: $FLANNEL_IPMASQ" >&2
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exit 1
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fi
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fi
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eval docker_opts="\$${combined_opts_key}"
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if [ "$docker_opts" ]; then
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docker_opts="$docker_opts ";
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fi
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echo -n "" >$docker_env
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for opt in $(set | grep "DOCKER_OPT_"); do
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OPT_NAME=$(echo $opt | awk -F "=" '{print $1;}');
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OPT_VALUE=$(eval echo "\$$OPT_NAME");
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if [ "$indiv_opts" = true ]; then
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echo "$OPT_NAME=\"$OPT_VALUE\"" >>$docker_env;
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fi
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docker_opts="$docker_opts $OPT_VALUE";
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done
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if [ "$combined_opts" = true ]; then
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echo "${combined_opts_key}=\"${docker_opts}\"" >>$docker_env
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fi
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