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#!/bin/bash

# Copyright 2021 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.

# check_sed returns an error and suggests installing GNU sed, if OS X sed is

# detected.

function util::common::check_sed {

# OS X sed doesn't support "--version". This way we can tell if OS X sed is

# used.

if ! sed --version &>/dev/null; then

# OS X sed and GNU sed aren't compatible with backup flag "-i". Namely

# sed -i ... - does not work on OS X

# sed -i'' ... - does not work on certain OS X versions

# sed -i '' ... - does not work on GNU

echo ">>> OS X sed detected, which may be incompatible with this script. Please install and use GNU sed instead:

$ brew install gnu-sed

$ brew info gnu-sed

# Find the path to the installed gnu-sed and add it to your PATH. The default

# is:

# PATH=\"/Users/\$USER/homebrew/opt/gnu-sed/libexec/gnubin:\$PATH\""

exit 1

fi

}