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// Copyright © 2016 Zlatko Čalušić
//
// Use of this source code is governed by an MIT-style license that can be found in the LICENSE file.
package sysinfo
import (
"bufio"
"os"
"regexp"
"strings"
)
// OS information.
type OS struct {
Name string `json:"name,omitempty"`
Vendor string `json:"vendor,omitempty"`
Version string `json:"version,omitempty"`
Release string `json:"release,omitempty"`
Architecture string `json:"architecture,omitempty"`
}
var (
rePrettyName = regexp.MustCompile(`^PRETTY_NAME=(.*)$`)
reID = regexp.MustCompile(`^ID=(.*)$`)
reVersionID = regexp.MustCompile(`^VERSION_ID=(.*)$`)
reUbuntu = regexp.MustCompile(`[\( ]([\d\.]+)`)
reCentOS = regexp.MustCompile(`^CentOS( Linux)? release ([\d\.]+)`)
reRedHat = regexp.MustCompile(`[\( ]([\d\.]+)`)
)
func (si *SysInfo) getOSInfo() {
// This seems to be the best and most portable way to detect OS architecture (NOT kernel!)
if _, err := os.Stat("/lib64/ld-linux-x86-64.so.2"); err == nil {
si.OS.Architecture = "amd64"
} else if _, err := os.Stat("/lib/ld-linux.so.2"); err == nil {
si.OS.Architecture = "i386"
}
f, err := os.Open("/etc/os-release")
if err != nil {
return
}
defer f.Close()
s := bufio.NewScanner(f)
for s.Scan() {
if m := rePrettyName.FindStringSubmatch(s.Text()); m != nil {
si.OS.Name = strings.Trim(m[1], `"`)
} else if m := reID.FindStringSubmatch(s.Text()); m != nil {
si.OS.Vendor = strings.Trim(m[1], `"`)
} else if m := reVersionID.FindStringSubmatch(s.Text()); m != nil {
si.OS.Version = strings.Trim(m[1], `"`)
}
}
switch si.OS.Vendor {
case "debian":
si.OS.Release = slurpFile("/etc/debian_version")
case "ubuntu":
if m := reUbuntu.FindStringSubmatch(si.OS.Name); m != nil {
si.OS.Release = m[1]
}
case "centos":
if release := slurpFile("/etc/centos-release"); release != "" {
if m := reCentOS.FindStringSubmatch(release); m != nil {
si.OS.Release = m[2]
}
}
case "rhel":
if release := slurpFile("/etc/redhat-release"); release != "" {
if m := reRedHat.FindStringSubmatch(release); m != nil {
si.OS.Release = m[1]
}
}
if si.OS.Release == "" {
if m := reRedHat.FindStringSubmatch(si.OS.Name); m != nil {
si.OS.Release = m[1]
}
}
}
}
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