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package main
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"runtime"
"github.com/docker/docker/pkg/system"
"github.com/pkg/errors"
"github.com/projectatomic/libpod/cmd/kpod/formats"
"github.com/urfave/cli"
)
var (
infoDescription = "display system information"
infoCommand = cli.Command{
Name: "info",
Usage: infoDescription,
Description: `Information display here pertain to the host, current storage stats, and build of kpod. Useful for the user and when reporting issues.`,
Flags: infoFlags,
Action: infoCmd,
ArgsUsage: "",
}
infoFlags = []cli.Flag{
cli.BoolFlag{
Name: "debug, D",
Usage: "display additional debug information",
},
cli.StringFlag{
Name: "format",
Usage: "Change the output format to JSON or a Go template",
},
}
)
func infoCmd(c *cli.Context) error {
if err := validateFlags(c, infoFlags); err != nil {
return err
}
info := map[string]interface{}{}
infoGivers := []infoGiverFunc{
storeInfo,
hostInfo,
}
if c.Bool("debug") {
infoGivers = append(infoGivers, debugInfo)
}
for _, giver := range infoGivers {
thisName, thisInfo, err := giver(c)
if err != nil {
info[thisName] = infoErr(err)
continue
}
info[thisName] = thisInfo
}
var out formats.Writer
infoOutputFormat := c.String("format")
switch infoOutputFormat {
case formats.JSONString:
out = formats.JSONStruct{Output: info}
case "":
out = formats.YAMLStruct{Output: info}
default:
out = formats.StdoutTemplate{Output: info, Template: infoOutputFormat}
}
formats.Writer(out).Out()
return nil
}
func infoErr(err error) map[string]interface{} {
return map[string]interface{}{
"error": err.Error(),
}
}
type infoGiverFunc func(c *cli.Context) (name string, info map[string]interface{}, err error)
// top-level "debug" info
func debugInfo(c *cli.Context) (string, map[string]interface{}, error) {
info := map[string]interface{}{}
info["compiler"] = runtime.Compiler
info["go version"] = runtime.Version()
info["kpod version"] = c.App.Version
info["git commit"] = gitCommit
return "debug", info, nil
}
// top-level "host" info
func hostInfo(c *cli.Context) (string, map[string]interface{}, error) {
// lets say OS, arch, number of cpus, amount of memory, maybe os distribution/version, hostname, kernel version, uptime
info := map[string]interface{}{}
info["os"] = runtime.GOOS
info["arch"] = runtime.GOARCH
info["cpus"] = runtime.NumCPU()
mi, err := system.ReadMemInfo()
if err != nil {
info["meminfo"] = infoErr(err)
} else {
// TODO this might be a place for github.com/dustin/go-humanize
info["MemTotal"] = mi.MemTotal
info["MemFree"] = mi.MemFree
info["SwapTotal"] = mi.SwapTotal
info["SwapFree"] = mi.SwapFree
}
if kv, err := readKernelVersion(); err != nil {
info["kernel"] = infoErr(err)
} else {
info["kernel"] = kv
}
if up, err := readUptime(); err != nil {
info["uptime"] = infoErr(err)
} else {
info["uptime"] = up
}
if host, err := os.Hostname(); err != nil {
info["hostname"] = infoErr(err)
} else {
info["hostname"] = host
}
return "host", info, nil
}
// top-level "store" info
func storeInfo(c *cli.Context) (string, map[string]interface{}, error) {
storeStr := "store"
config, err := getConfig(c)
if err != nil {
return storeStr, nil, errors.Wrapf(err, "Could not get config")
}
store, err := getStore(config)
if err != nil {
return storeStr, nil, err
}
// lets say storage driver in use, number of images, number of containers
info := map[string]interface{}{}
info["GraphRoot"] = store.GraphRoot()
info["RunRoot"] = store.RunRoot()
info["GraphDriverName"] = store.GraphDriverName()
info["GraphOptions"] = store.GraphOptions()
statusPairs, err := store.Status()
if err != nil {
return storeStr, nil, err
}
status := map[string]string{}
for _, pair := range statusPairs {
status[pair[0]] = pair[1]
}
info["GraphStatus"] = status
images, err := store.Images()
if err != nil {
info["ImageStore"] = infoErr(err)
} else {
info["ImageStore"] = map[string]interface{}{
"number": len(images),
}
}
containers, err := store.Containers()
if err != nil {
info["ContainerStore"] = infoErr(err)
} else {
info["ContainerStore"] = map[string]interface{}{
"number": len(containers),
}
}
return storeStr, info, nil
}
func readKernelVersion() (string, error) {
buf, err := ioutil.ReadFile("/proc/version")
if err != nil {
return "", err
}
f := bytes.Fields(buf)
if len(f) < 2 {
return string(bytes.TrimSpace(buf)), nil
}
return string(f[2]), nil
}
func readUptime() (string, error) {
buf, err := ioutil.ReadFile("/proc/uptime")
if err != nil {
return "", err
}
f := bytes.Fields(buf)
if len(f) < 1 {
return "", fmt.Errorf("invalid uptime")
}
return string(f[0]), nil
}
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