1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
|
/*
Copyright 2014 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.
*/
// Package verflag defines utility functions to handle command line flags
// related to version of Kubernetes.
package verflag
import (
"fmt"
"io"
"os"
"strconv"
"strings"
flag "github.com/spf13/pflag"
"k8s.io/component-base/version"
)
type versionValue string
const (
VersionFalse versionValue = "false"
VersionTrue versionValue = "true"
VersionRaw versionValue = "raw"
)
const strRawVersion string = "raw"
func (v *versionValue) IsBoolFlag() bool {
return true
}
func (v *versionValue) Get() interface{} {
return versionValue(*v)
}
func (v *versionValue) Set(s string) error {
if s == strRawVersion {
*v = VersionRaw
return nil
}
if strings.HasPrefix(s, "v") {
err := version.SetDynamicVersion(s)
if err == nil {
*v = versionValue(s)
}
return err
}
boolVal, err := strconv.ParseBool(s)
if err == nil {
if boolVal {
*v = VersionTrue
} else {
*v = VersionFalse
}
}
return err
}
func (v *versionValue) String() string {
return string(*v)
}
// The type of the flag as required by the pflag.Value interface
func (v *versionValue) Type() string {
return "version"
}
func VersionVar(p *versionValue, name string, value versionValue, usage string) {
*p = value
flag.Var(p, name, usage)
// "--version" will be treated as "--version=true"
flag.Lookup(name).NoOptDefVal = "true"
}
func Version(name string, value versionValue, usage string) *versionValue {
p := new(versionValue)
VersionVar(p, name, value, usage)
return p
}
const versionFlagName = "version"
var (
versionFlag = Version(versionFlagName, VersionFalse, "--version, --version=raw prints version information and quits; --version=vX.Y.Z... sets the reported version")
programName = "Kubernetes"
)
// AddFlags registers this package's flags on arbitrary FlagSets, such that they point to the
// same value as the global flags.
func AddFlags(fs *flag.FlagSet) {
fs.AddFlag(flag.Lookup(versionFlagName))
}
// variables for unit testing PrintAndExitIfRequested
var (
output = io.Writer(os.Stdout)
exit = os.Exit
)
// PrintAndExitIfRequested will check if --version or --version=raw was passed
// and, if so, print the version and exit.
func PrintAndExitIfRequested() {
if *versionFlag == VersionRaw {
fmt.Fprintf(output, "%#v\n", version.Get())
exit(0)
} else if *versionFlag == VersionTrue {
fmt.Fprintf(output, "%s %s\n", programName, version.Get())
exit(0)
}
}
|
