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version_linux.go
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version_linux.go
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// +build linux
package system
import (
"fmt"
"io/ioutil"
"os/exec"
"strings"
"github.com/jenkins-x/jx/v2/pkg/util"
)
// ReleaseFileGetter defines the interface for read system file
type ReleaseFileGetter interface {
GetFileContents(string) (string, error)
}
// DefaultReleaseFileGetter is the default implementation of ReleaseFileGetter
type DefaultReleaseFileGetter struct{}
// GetFileContents returns the file contents
func (r *DefaultReleaseFileGetter) GetFileContents(file string) (string, error) {
buf, err := ioutil.ReadFile(file)
if err != nil {
return "", err
}
return strings.Trim(string(buf), "\n"), nil
}
// SetReleaseGetter sets the current releaseFileGetter
func SetReleaseGetter(r ReleaseFileGetter) {
releaseGetter = r
}
var releaseGetter ReleaseFileGetter = &DefaultReleaseFileGetter{}
// GetOsVersion returns a human friendly string of the current OS
// in the case of an error this still returns a valid string for the details that can be found.
func GetOsVersion() (string, error) {
output, err := releaseGetter.GetFileContents("/etc/os-release")
if err == nil {
release, err := util.ExtractKeyValuePairs(strings.Split(strings.TrimSpace(output), "\n"), "=")
if err == nil && len(release["PRETTY_NAME"]) != 0 {
return strings.ReplaceAll(release["PRETTY_NAME"], "\"", ""), nil
}
}
// fallback
output, err = runCommand("lsb_release", "-d", "-s")
if err == nil {
return output, nil
}
// procfs will tell us the kernel version
output, err = releaseGetter.GetFileContents("/proc/version")
if err == nil {
return fmt.Sprintf("Unknown Linux distribution %s", output), nil
}
return "Unknown Linux version", fmt.Errorf("Unknown Linux version")
}
func runCommand(command string, args ...string) (string, error) {
e := exec.Command(command, args...)
data, err := e.CombinedOutput()
text := string(data)
text = strings.TrimSpace(text)
if err != nil {
return "", fmt.Errorf("command failed '%s %s': %s %s\n", command, strings.Join(args, " "), text, err)
}
return text, err
}