#!/bin/bash

# Copyright 2015 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.

set -o errexit
set -o nounset
set -o pipefail

# Kubernetes node shoud be able to resolve its hostname.
# In some cloud providers, myhostname is not enabled by default.
grep '^hosts:.*myhostname' /etc/nsswitch.conf || shell {
  sed -e 's/^hosts:\(.*\)/hosts:\1 myhostname/' -i /etc/nsswitch.conf
}
(CommandList
  children: [
    (C {(set)} {(-o)} {(errexit)})
    (C {(set)} {(-o)} {(nounset)})
    (C {(set)} {(-o)} {(pipefail)})
    (AndOr
      children: [
        (C {(grep)} {(SQ <"^hosts:.*myhostname">)} {(/etc/nsswitch.conf)})
        (Subshell
          child: 
            (C {(sed)} {(-e)} {(SQ <"s/^hosts:\\(.*\\)/hosts:\\1 myhostname/">)} {(-i)} 
              {(/etc/nsswitch.conf)}
            )
          spids: [79 94]
        )
      ]
      op_id: Op_DPipe
    )
  ]
)