blob: 5e041d6f3faf8fc1081210f319ed353da6e8560a [file] [log] [blame]
Matthias Andreas Benkard832a54e2019-01-29 09:27:38 +01001/*
2Copyright 2018 The Kubernetes Authors.
3
4Licensed under the Apache License, Version 2.0 (the "License");
5you may not use this file except in compliance with the License.
6You may obtain a copy of the License at
7
8 http://www.apache.org/licenses/LICENSE-2.0
9
10Unless required by applicable law or agreed to in writing, software
11distributed under the License is distributed on an "AS IS" BASIS,
12WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13See the License for the specific language governing permissions and
14limitations under the License.
15*/
16
17package version
18
19import (
20 "regexp"
21 "strconv"
22 "strings"
23)
24
25type versionType int
26
27const (
28 // Bigger the version type number, higher priority it is
29 versionTypeAlpha versionType = iota
30 versionTypeBeta
31 versionTypeGA
32)
33
34var kubeVersionRegex = regexp.MustCompile("^v([\\d]+)(?:(alpha|beta)([\\d]+))?$")
35
36func parseKubeVersion(v string) (majorVersion int, vType versionType, minorVersion int, ok bool) {
37 var err error
38 submatches := kubeVersionRegex.FindStringSubmatch(v)
39 if len(submatches) != 4 {
40 return 0, 0, 0, false
41 }
42 switch submatches[2] {
43 case "alpha":
44 vType = versionTypeAlpha
45 case "beta":
46 vType = versionTypeBeta
47 case "":
48 vType = versionTypeGA
49 default:
50 return 0, 0, 0, false
51 }
52 if majorVersion, err = strconv.Atoi(submatches[1]); err != nil {
53 return 0, 0, 0, false
54 }
55 if vType != versionTypeGA {
56 if minorVersion, err = strconv.Atoi(submatches[3]); err != nil {
57 return 0, 0, 0, false
58 }
59 }
60 return majorVersion, vType, minorVersion, true
61}
62
63// CompareKubeAwareVersionStrings compares two kube-like version strings.
64// Kube-like version strings are starting with a v, followed by a major version, optional "alpha" or "beta" strings
65// followed by a minor version (e.g. v1, v2beta1). Versions will be sorted based on GA/alpha/beta first and then major
66// and minor versions. e.g. v2, v1, v1beta2, v1beta1, v1alpha1.
67func CompareKubeAwareVersionStrings(v1, v2 string) int {
68 if v1 == v2 {
69 return 0
70 }
71 v1major, v1type, v1minor, ok1 := parseKubeVersion(v1)
72 v2major, v2type, v2minor, ok2 := parseKubeVersion(v2)
73 switch {
74 case !ok1 && !ok2:
75 return strings.Compare(v2, v1)
76 case !ok1 && ok2:
77 return -1
78 case ok1 && !ok2:
79 return 1
80 }
81 if v1type != v2type {
82 return int(v1type) - int(v2type)
83 }
84 if v1major != v2major {
85 return v1major - v2major
86 }
87 return v1minor - v2minor
88}