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114 lines
2.8 KiB
Bash
Executable file
114 lines
2.8 KiB
Bash
Executable file
#!/usr/bin/env bash
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# Copyright 2014 The Kubernetes Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# Generate Docker daemon options based on flannel env file.
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# exit on any error
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set -e
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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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" >/dev/stderr
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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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val=""
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while getopts "f:d:icmk:" 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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\?)
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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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source "${flannel_env}"
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fi
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if [[ -n "$FLANNEL_SUBNET" ]]; then
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# shellcheck disable=SC2034 # Variable name referenced in OPT_LOOP below
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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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# shellcheck disable=SC2034 # Variable name referenced in OPT_LOOP below
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DOCKER_OPT_MTU="--mtu=$FLANNEL_MTU"
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fi
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if [[ "$FLANNEL_IPMASQ" = true ]] && [[ $ipmasq = true ]]; then
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# shellcheck disable=SC2034 # Variable name referenced in OPT_LOOP below
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DOCKER_OPT_IPMASQ="--ip-masq=false"
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fi
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eval docker_opts="\$${combined_opts_key}"
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docker_opts+=" "
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echo -n "" >"${docker_env}"
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# OPT_LOOP
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for opt in $(compgen -v DOCKER_OPT_); do
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eval val=\$"${opt}"
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if [[ "$indiv_opts" = true ]]; then
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echo "$opt=\"$val\"" >>"${docker_env}"
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fi
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docker_opts+="$val "
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done
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if [[ "$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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