1 files changed, 113 insertions, 0 deletions
diff --git a/pkgs/applications/networking/cluster/kubernetes/mk-docker-opts.sh b/pkgs/applications/networking/cluster/kubernetes/mk-docker-opts.sh
new file mode 100755
index 000000000000..22a459f51349
--- /dev/null
+++ b/pkgs/applications/networking/cluster/kubernetes/mk-docker-opts.sh
@@ -0,0 +1,113 @@
+#!/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