/
distribution.go
189 lines (164 loc) · 4.01 KB
/
distribution.go
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
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
//
// (C) Copyright 2021-2023 Intel Corporation.
//
// SPDX-License-Identifier: BSD-2-Clause-Patent
//
package system
import (
"bufio"
"fmt"
"os"
"strconv"
"strings"
"github.com/pkg/errors"
)
type (
// KernelVersion is the kernel version.
KernelVersion struct {
Major int
Minor int
Patch int
}
// DistributionVersion represents a version of a Linux distribution.
DistributionVersion struct {
StringVersion string `json:"string_version"`
Major int `json:"major"`
Minor int `json:"minor"`
Patch int `json:"patch"`
}
// Distribution represents a Linux distribution.
Distribution struct {
ID string `json:"id"`
Name string `json:"name"`
Version DistributionVersion `json:"version"`
Kernel KernelVersion `json:"kernel"`
}
openFunc func(string) (*os.File, error)
)
func (dv DistributionVersion) String() string {
if dv.StringVersion != "" {
return dv.StringVersion
}
return fmt.Sprintf("%d.%d.%d", dv.Major, dv.Minor, dv.Patch)
}
func (d Distribution) String() string {
return fmt.Sprintf("%s (%s)", d.Name, d.Version)
}
func parseDistributionFile(df *os.File) (*Distribution, error) {
distribution := new(Distribution)
var key, val string
scn := bufio.NewScanner(df)
for scn.Scan() {
keyVal := strings.Split(scn.Text(), "=")
if len(keyVal) != 2 {
continue
}
key = strings.TrimSpace(keyVal[0])
val = strings.TrimSpace(strings.Trim(keyVal[1], `"`))
switch key {
case "ID":
distribution.ID = val
case "NAME":
distribution.Name = val
case "VERSION":
if distribution.Version.StringVersion == "" {
distribution.Version.StringVersion = val
}
case "VERSION_ID":
distribution.Version.StringVersion = val
}
}
if err := scn.Err(); err != nil {
return nil, errors.Wrapf(err, "failed to parse %s", df.Name())
}
return distribution, nil
}
func parseMajorMinorPatch(version string) (maj int, min int, pat int) {
mmp := strings.Split(version, ".")
for i, v := range mmp {
switch i {
case 0:
maj, _ = strconv.Atoi(v)
case 1:
min, _ = strconv.Atoi(v)
case 2:
pat, _ = strconv.Atoi(v)
}
}
return
}
func getKernelVersion(kernel *KernelVersion, open openFunc) {
f, err := open("/proc/version")
if err != nil {
return
}
defer f.Close()
scn := bufio.NewScanner(f)
if scn.Scan() {
fields := strings.Split(scn.Text(), " ")
for i, field := range fields {
if field == "version" {
kernel.Major, kernel.Minor, kernel.Patch = parseMajorMinorPatch(fields[i+1])
break
}
}
}
}
func getDistributionRelease(fileName string, dv *DistributionVersion, open openFunc) {
f, err := open(fileName)
if err != nil {
return
}
defer f.Close()
scn := bufio.NewScanner(f)
if scn.Scan() {
fields := strings.Fields(scn.Text())
for i, field := range fields {
if field == "release" {
dv.Major, dv.Minor, dv.Patch = parseMajorMinorPatch(fields[i+1])
break
}
}
}
if dv.Major > 0 {
dv.StringVersion = ""
}
}
func getDistribution(open openFunc) Distribution {
defaultDistro := Distribution{
ID: "unknown",
Name: "unknown",
}
f, err := open("/etc/os-release")
if err != nil {
return defaultDistro
}
defer f.Close()
dist, err := parseDistributionFile(f)
if err != nil {
return defaultDistro
}
getKernelVersion(&dist.Kernel, open)
switch dist.ID {
// The centos and redhat cases here are actually targeted at only the 7.x
// releases. The default case should handle all EL8s.
case "centos":
getDistributionRelease("/etc/centos-release", &dist.Version, open)
case "redhat":
getDistributionRelease("/etc/redhat-release", &dist.Version, open)
default:
fields := strings.Fields(dist.Version.StringVersion)
if len(fields) > 0 {
v := &dist.Version
v.Major, v.Minor, v.Patch = parseMajorMinorPatch(fields[0])
if dist.Version.Major > 0 {
dist.Version.StringVersion = ""
}
}
}
return *dist
}
// GetDistribution returns information about the current Linux distribution.
func GetDistribution() Distribution {
return getDistribution(os.Open)
}