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#!/usr/bin/env bash
# Copyright 2014 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# Generate Docker daemon options based on flannel env file.
# exit on any error
set -e
usage() {
echo "$0 [-f FLANNEL-ENV-FILE] [-d DOCKER-ENV-FILE] [-i] [-c] [-m] [-k COMBINED-KEY]
Generate Docker daemon options based on flannel env file
OPTIONS:
-f Path to flannel env file. Defaults to /run/flannel/subnet.env
-d Path to Docker env file to write to. Defaults to /run/docker_opts.env
-i Output each Docker option as individual var. e.g. DOCKER_OPT_MTU=1500
-c Output combined Docker options into DOCKER_OPTS var
-k Set the combined options key to this value (default DOCKER_OPTS=)
-m Do not output --ip-masq (useful for older Docker version)
" >/dev/stderr
exit 1
}
flannel_env="/run/flannel/subnet.env"
docker_env="/run/docker_opts.env"
combined_opts_key="DOCKER_OPTS"
indiv_opts=false
combined_opts=false
ipmasq=true
val=""
while getopts "f:d:icmk:" opt; do
case $opt in
f)
flannel_env=$OPTARG
;;
d)
docker_env=$OPTARG
;;
i)
indiv_opts=true
;;
c)
combined_opts=true
;;
m)
ipmasq=false
;;
k)
combined_opts_key=$OPTARG
;;
\?)
usage
;;
esac
done
if [[ $indiv_opts = false ]] && [[ $combined_opts = false ]]; then
indiv_opts=true
combined_opts=true
fi
if [[ -f "${flannel_env}" ]]; then
source "${flannel_env}"
fi
if [[ -n "$FLANNEL_SUBNET" ]]; then
# shellcheck disable=SC2034 # Variable name referenced in OPT_LOOP below
DOCKER_OPT_BIP="--bip=$FLANNEL_SUBNET"
fi
if [[ -n "$FLANNEL_MTU" ]]; then
# shellcheck disable=SC2034 # Variable name referenced in OPT_LOOP below
DOCKER_OPT_MTU="--mtu=$FLANNEL_MTU"
fi
if [[ "$FLANNEL_IPMASQ" = true ]] && [[ $ipmasq = true ]]; then
# shellcheck disable=SC2034 # Variable name referenced in OPT_LOOP below
DOCKER_OPT_IPMASQ="--ip-masq=false"
fi
eval docker_opts="\$${combined_opts_key}"
docker_opts+=" "
echo -n "" >"${docker_env}"
# OPT_LOOP
for opt in $(compgen -v DOCKER_OPT_); do
eval val=\$"${opt}"
if [[ "$indiv_opts" = true ]]; then
echo "$opt=\"$val\"" >>"${docker_env}"
fi
docker_opts+="$val "
done
if [[ "$combined_opts" = true ]]; then
echo "${combined_opts_key}=\"${docker_opts}\"" >>"${docker_env}"
fi
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