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run_prepared.go
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run_prepared.go
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// Copyright 2015 The rkt Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//+build linux
package main
import (
"github.com/coreos/rkt/Godeps/_workspace/src/github.com/spf13/cobra"
"github.com/coreos/rkt/common"
"github.com/coreos/rkt/stage0"
"github.com/coreos/rkt/store"
)
const (
cmdRunPreparedName = "run-prepared"
)
var (
cmdRunPrepared = &cobra.Command{
Use: "run-prepared UUID",
Short: "Run a prepared application pod in rkt",
Long: "UUID must have been acquired via `rkt prepare`",
Run: runWrapper(runRunPrepared),
}
)
func init() {
cmdRkt.AddCommand(cmdRunPrepared)
cmdRunPrepared.Flags().Var(&flagNet, "net", "configure the pod's networking. optionally pass a list of user-configured networks to load and arguments to pass to them. syntax: --net[=n[:args]][,]")
cmdRunPrepared.Flags().Lookup("net").NoOptDefVal = "default"
cmdRunPrepared.Flags().BoolVar(&flagInteractive, "interactive", false, "the pod is interactive")
cmdRunPrepared.Flags().BoolVar(&flagMDSRegister, "mds-register", false, "register pod with metadata service")
}
func runRunPrepared(cmd *cobra.Command, args []string) (exit int) {
if len(args) != 1 {
cmd.Usage()
return 1
}
podUUID, err := resolveUUID(args[0])
if err != nil {
stderr("Unable to resolve UUID: %v", err)
return 1
}
s, err := store.NewStore(globalFlags.Dir)
if err != nil {
stderr("prepared-run: cannot open store: %v", err)
return 1
}
p, err := getPod(podUUID)
if err != nil {
stderr("prepared-run: cannot get pod: %v", err)
return 1
}
if !p.isPrepared {
stderr("prepared-run: pod %q is not prepared", podUUID.String())
return 1
}
if flagInteractive {
ac, err := p.getAppCount()
if err != nil {
stderr("prepared-run: cannot get pod's app count: %v", err)
return 1
}
if ac > 1 {
stderr("prepared-run: interactive option only supports pods with one app")
return 1
}
}
// Make sure we have a metadata service available before we move to
// run state so that the user can rerun the command without needing
// to prepare the image again.
if flagMDSRegister {
if err := stage0.CheckMdsAvailability(); err != nil {
stderr("prepare-run: %v", err)
return 1
}
}
if err := p.xToRun(); err != nil {
stderr("prepared-run: cannot transition to run: %v", err)
return 1
}
lfd, err := p.Fd()
if err != nil {
stderr("prepared-run: unable to get lock fd: %v", err)
return 1
}
apps, err := p.getApps()
if err != nil {
stderr("prepared-run: unable to get app list: %v", err)
return 1
}
rktgid, err := common.LookupGid(common.RktGroup)
if err != nil {
stderr("prepared-run: group %q not found, will use default gid when rendering images", common.RktGroup)
rktgid = -1
}
rcfg := stage0.RunConfig{
CommonConfig: stage0.CommonConfig{
Store: s,
UUID: p.uuid,
Debug: globalFlags.Debug,
},
Net: flagNet,
LockFd: lfd,
Interactive: flagInteractive,
MDSRegister: flagMDSRegister,
Apps: apps,
RktGid: rktgid,
}
if globalFlags.Debug {
stage0.InitDebug()
}
stage0.Run(rcfg, p.path(), globalFlags.Dir) // execs, never returns
return 1
}