forked from juju/juju
/
main.go
278 lines (246 loc) · 7.37 KB
/
main.go
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// Copyright 2012-2014 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package main
import (
"fmt"
"io"
"io/ioutil"
"math/rand"
"os"
"path/filepath"
"runtime"
"strings"
"time"
"github.com/juju/clock"
"github.com/juju/cmd"
"github.com/juju/errors"
"github.com/juju/loggo"
proxyutils "github.com/juju/proxy"
"github.com/juju/utils/exec"
jujucmd "github.com/juju/juju/cmd"
agentcmd "github.com/juju/juju/cmd/jujud/agent"
"github.com/juju/juju/cmd/jujud/dumplogs"
"github.com/juju/juju/cmd/jujud/introspect"
cmdutil "github.com/juju/juju/cmd/jujud/util"
components "github.com/juju/juju/component/all"
"github.com/juju/juju/core/machinelock"
"github.com/juju/juju/juju/names"
"github.com/juju/juju/juju/sockets"
// Import the providers.
_ "github.com/juju/juju/provider/all"
"github.com/juju/juju/upgrades"
"github.com/juju/juju/utils/proxy"
"github.com/juju/juju/worker/logsender"
"github.com/juju/juju/worker/uniter/runner/jujuc"
)
var log = loggo.GetLogger("juju.cmd.jujud")
func init() {
if err := components.RegisterForServer(); err != nil {
log.Criticalf("unabled to register server components: %v", err)
os.Exit(1)
}
}
func init() {
rand.Seed(time.Now().UTC().UnixNano())
}
var jujudDoc = `
juju provides easy, intelligent service orchestration on top of models
such as OpenStack, Amazon AWS, or bare metal. jujud is a component of juju.
https://jujucharms.com/
The jujud command can also forward invocations over RPC for execution by the
juju unit agent. When used in this way, it expects to be called via a symlink
named for the desired remote command, and expects JUJU_AGENT_SOCKET and
JUJU_CONTEXT_ID be set in its model.
`
const (
// exit_err is the value that is returned when the user has run juju in an invalid way.
exit_err = 2
// exit_panic is the value that is returned when we exit due to an unhandled panic.
exit_panic = 3
)
func getenv(name string) (string, error) {
value := os.Getenv(name)
if value == "" {
return "", errors.Errorf("%s not set", name)
}
return value, nil
}
func getwd() (string, error) {
dir, err := os.Getwd()
if err != nil {
return "", err
}
abs, err := filepath.Abs(dir)
if err != nil {
return "", err
}
return abs, nil
}
// hookToolMain uses JUJU_CONTEXT_ID and JUJU_AGENT_SOCKET to ask a running unit agent
// to execute a Command on our behalf. Individual commands should be exposed
// by symlinking the command name to this executable.
func hookToolMain(commandName string, ctx *cmd.Context, args []string) (code int, err error) {
code = 1
contextId, err := getenv("JUJU_CONTEXT_ID")
if err != nil {
return
}
dir, err := getwd()
if err != nil {
return
}
req := jujuc.Request{
ContextId: contextId,
Dir: dir,
CommandName: commandName,
Args: args[1:],
}
socketPath, err := getenv("JUJU_AGENT_SOCKET")
if err != nil {
return
}
client, err := sockets.Dial(socketPath)
if err != nil {
return
}
defer client.Close()
var resp exec.ExecResponse
err = client.Call("Jujuc.Main", req, &resp)
if err != nil && err.Error() == jujuc.ErrNoStdin.Error() {
req.Stdin, err = ioutil.ReadAll(os.Stdin)
if err != nil {
err = errors.Annotate(err, "cannot read stdin")
return
}
req.StdinSet = true
err = client.Call("Jujuc.Main", req, &resp)
}
if err != nil {
return
}
os.Stdout.Write(resp.Stdout)
os.Stderr.Write(resp.Stderr)
return resp.Code, nil
}
// Main registers subcommands for the jujud executable, and hands over control
// to the cmd package.
func jujuDMain(args []string, ctx *cmd.Context) (code int, err error) {
// Assuming an average of 200 bytes per log message, use up to
// 200MB for the log buffer.
defer logger.Debugf("jujud complete, code %d, err %v", code, err)
bufferedLogger, err := logsender.InstallBufferedLogWriter(1048576)
if err != nil {
return 1, errors.Trace(err)
}
// Set the default transport to use the in-process proxy
// configuration.
if err := proxy.DefaultConfig.Set(proxyutils.DetectProxies()); err != nil {
return 1, errors.Trace(err)
}
if err := proxy.DefaultConfig.InstallInDefaultTransport(); err != nil {
return 1, errors.Trace(err)
}
jujud := jujucmd.NewSuperCommand(cmd.SuperCommandParams{
Name: "jujud",
Doc: jujudDoc,
})
jujud.Log.NewWriter = func(target io.Writer) loggo.Writer {
return &jujudWriter{target: target}
}
jujud.Register(NewBootstrapCommand())
// TODO(katco-): AgentConf type is doing too much. The
// MachineAgent type has called out the separate concerns; the
// AgentConf should be split up to follow suit.
agentConf := agentcmd.NewAgentConf("")
machineAgentFactory := agentcmd.MachineAgentFactoryFn(
agentConf,
bufferedLogger,
agentcmd.DefaultIntrospectionSocketName,
upgrades.PreUpgradeSteps,
"",
)
jujud.Register(agentcmd.NewMachineAgentCmd(ctx, machineAgentFactory, agentConf, agentConf))
unitAgent, err := agentcmd.NewUnitAgent(ctx, bufferedLogger)
if err != nil {
return -1, errors.Trace(err)
}
jujud.Register(unitAgent)
caasOperatorAgent, err := agentcmd.NewCaasOperatorAgent(ctx, bufferedLogger)
if err != nil {
return -1, errors.Trace(err)
}
jujud.Register(caasOperatorAgent)
jujud.Register(NewUpgradeMongoCommand())
jujud.Register(agentcmd.NewCheckConnectionCommand(agentConf, agentcmd.ConnectAsAgent))
code = cmd.Main(jujud, ctx, args[1:])
return code, nil
}
// This function exists to preserve test functionality.
// On windows we need to catch the return code from main for
// service functionality purposes, but on unix we can just os.Exit
func MainWrapper(args []string) {
os.Exit(Main(args))
}
// Main is not redundant with main(), because it provides an entry point
// for testing with arbitrary command line arguments.
func Main(args []string) int {
defer func() {
if r := recover(); r != nil {
buf := make([]byte, 4096)
buf = buf[:runtime.Stack(buf, false)]
logger.Criticalf("Unhandled panic: \n%v\n%s", r, buf)
os.Exit(exit_panic)
}
}()
ctx, err := cmd.DefaultContext()
if err != nil {
cmd.WriteError(os.Stderr, err)
os.Exit(exit_err)
}
code := 1
commandName := filepath.Base(args[0])
switch commandName {
case names.Jujud:
code, err = jujuDMain(args, ctx)
case names.JujuRun:
lock, err := machinelock.New(machinelock.Config{
AgentName: "juju-run",
Clock: clock.WallClock,
Logger: loggo.GetLogger("juju.machinelock"),
LogFilename: filepath.Join(cmdutil.LogDir, machinelock.Filename),
})
if err != nil {
code = exit_err
} else {
run := &RunCommand{MachineLock: lock}
code = cmd.Main(run, ctx, args[1:])
}
case names.JujuDumpLogs:
code = cmd.Main(dumplogs.NewCommand(), ctx, args[1:])
case names.JujuIntrospect:
code = cmd.Main(&introspect.IntrospectCommand{}, ctx, args[1:])
default:
code, err = hookToolMain(commandName, ctx, args)
}
if err != nil {
cmd.WriteError(ctx.Stderr, err)
}
return code
}
type jujudWriter struct {
target io.Writer
}
func (w *jujudWriter) Write(entry loggo.Entry) {
if strings.HasPrefix(entry.Module, "unit.") {
fmt.Fprintln(w.target, w.unitFormat(entry))
} else {
fmt.Fprintln(w.target, loggo.DefaultFormatter(entry))
}
}
func (w *jujudWriter) unitFormat(entry loggo.Entry) string {
ts := entry.Timestamp.In(time.UTC).Format("2006-01-02 15:04:05")
// Just show the last element of the module.
lastDot := strings.LastIndex(entry.Module, ".")
module := entry.Module[lastDot+1:]
return fmt.Sprintf("%s %s %s %s", ts, entry.Level, module, entry.Message)
}