1#!/usr/bin/env bash
2
3# Copyright 2024 The Kubernetes Authors.
4#
5# Licensed under the Apache License, Version 2.0 (the "License");
6# you may not use this file except in compliance with the License.
7# You may obtain a copy of the License at
8#
9# http://www.apache.org/licenses/LICENSE-2.0
10#
11# Unless required by applicable law or agreed to in writing, software
12# distributed under the License is distributed on an "AS IS" BASIS,
13# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14# See the License for the specific language governing permissions and
15# limitations under the License.
16
17set -o errexit
18set -o nounset
19set -o pipefail
20
21function usage {
22 local script="$(basename $0)"
23
24 echo >&2 "Usage: ${script} [-g <maximum go directive>]
25
26This script should be run at the root of a module.
27
28-g <maximum go directive>
29 Compare the go directive in the local working copy's go.mod
30 to the specified maximum version it can be. Versions provided
31 here are of the form 1.x.y, without the 'go' prefix.
32
33Examples:
34 ${script} -g 1.20
35 ${script} -g 1.21.6
36"
37 exit 1
38}
39
40max=""
41while getopts g: o
42do case "$o" in
43 g) max="$OPTARG";;
44 [?]) usage;;
45 esac
46done
47
48# If max is empty, print usage and error
49if [[ -z "${max}" ]]; then
50 usage;
51fi
52
53# Don't specify the version with the go prefix, just 1.x.y will do.
54if ! printf '%s\n' "${max}" | grep -v -q "^go"; then
55 usage;
56fi
57
58current=$(grep '^go [1-9]*' go.mod | cut -d ' ' -f2)
59if [[ -z "${current}" ]]; then
60 echo >&2 "FAIL: could not get value of go directive from go.mod"
61 exit 1
62fi
63
64if ! printf '%s\n' "${current}" "${max}" | sort --check=silent --version-sort; then
65 echo >&2 "FAIL: current Go directive ${current} is greater than ${max}"
66 exit 1
67fi
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