refactor OS X sed check into a util

scripts/update-client.sh

@@ -24,22 +24,6 @@ set -o pipefail
 # The openapi-generator version used by this client
 export OPENAPI_GENERATOR_COMMIT="v4.3.0"
 
-# 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
-
 SCRIPT_ROOT=$(dirname "${BASH_SOURCE}")
 CLIENT_ROOT="${SCRIPT_ROOT}/../kubernetes"
 CLIENT_VERSION=$(python "${SCRIPT_ROOT}/constants.py" CLIENT_VERSION)
@@ -50,11 +34,14 @@ pushd "${SCRIPT_ROOT}" > /dev/null
 SCRIPT_ROOT=`pwd`
 popd > /dev/null
 
+source ${SCRIPT_ROOT}/util/common.sh
+util::common::check_sed
+
 pushd "${CLIENT_ROOT}" > /dev/null
 CLIENT_ROOT=`pwd`
 popd > /dev/null
 
-TEMP_FOLDER=$(mktemp -d) 
+TEMP_FOLDER=$(mktemp -d)
 trap "rm -rf ${TEMP_FOLDER}" EXIT SIGINT
 
 SETTING_FILE="${TEMP_FOLDER}/settings"

scripts/update-submodule.sh

@@ -31,27 +31,15 @@ set -o errexit
 set -o nounset
 set -o pipefail
 
-# 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
 
 repo_root="$(git rev-parse --show-toplevel)"
 declare -r repo_root
 cd "${repo_root}"
 
 source scripts/util/changelog.sh
+source scripts/util/common.sh
+
+util::common::check_sed
 go get k8s.io/release/cmd/release-notes
 
 TARGET_RELEASE=${TARGET_RELEASE:-"v$(grep "^CLIENT_VERSION = \"" scripts/constants.py | sed "s/CLIENT_VERSION = \"//g" | sed "s/\"//g")"}

scripts/util/common.sh

@@ -0,0 +1,35 @@
+#!/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
+}