func (b *Builder) Build() error {
logs.WithF(b.fields).Info("Building aci")
lfd, err := rktcommon.GetRktLockFD()
if err != nil {
return errs.WithEF(err, b.fields, "can't get rkt lock fd")
}
if err := sys.CloseOnExec(lfd, true); err != nil {
return errs.WithEF(err, b.fields, "can't set FD_CLOEXEC on rkt lock")
}
if err := b.runBuild(); err != nil {
return err
}
if err := b.writeManifest(); err != nil {
return err
}
if err := b.tarAci(); err != nil {
return err
}
return nil
}
func run() int {
lfd, err := common.GetRktLockFD()
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to get rkt lock fd: %v\n", err)
return 1
}
if err := sys.CloseOnExec(lfd, true); err != nil {
fmt.Fprintf(os.Stderr, "Failed to set FD_CLOEXEC on rkt lock: %v\n", err)
return 1
}
if err := stage1common.WritePpid(os.Getpid()); err != nil {
fmt.Fprintf(os.Stderr, "write ppid: %v", err)
return 1
}
fmt.Println("success, stub stage1 would at this point switch to stage2")
return 0
}
func stage1() int {
uuid, err := types.NewUUID(flag.Arg(0))
if err != nil {
log.PrintE("UUID is missing or malformed", err)
return 1
}
root := "."
p, err := stage1commontypes.LoadPod(root, uuid)
if err != nil {
log.PrintE("failed to load pod", err)
return 1
}
// set close-on-exec flag on RKT_LOCK_FD so it gets correctly closed when invoking
// network plugins
lfd, err := common.GetRktLockFD()
if err != nil {
log.PrintE("failed to get rkt lock fd", err)
return 1
}
if err := sys.CloseOnExec(lfd, true); err != nil {
log.PrintE("failed to set FD_CLOEXEC on rkt lock", err)
return 1
}
mirrorLocalZoneInfo(p.Root)
flavor, _, err := stage1initcommon.GetFlavor(p)
if err != nil {
log.PrintE("failed to get stage1 flavor", err)
return 3
}
var n *networking.Networking
if netList.Contained() {
fps, err := forwardedPorts(p)
if err != nil {
log.Error(err)
return 6
}
n, err = networking.Setup(root, p.UUID, fps, netList, localConfig, flavor, debug)
if err != nil {
log.PrintE("failed to setup network", err)
return 6
}
if err = n.Save(); err != nil {
log.PrintE("failed to save networking state", err)
n.Teardown(flavor, debug)
return 6
}
if len(mdsToken) > 0 {
hostIP, err := n.GetDefaultHostIP()
if err != nil {
log.PrintE("failed to get default Host IP", err)
return 6
}
p.MetadataServiceURL = common.MetadataServicePublicURL(hostIP, mdsToken)
}
} else {
if flavor == "kvm" {
log.Print("flavor kvm requires private network configuration (try --net)")
return 6
}
if len(mdsToken) > 0 {
p.MetadataServiceURL = common.MetadataServicePublicURL(localhostIP, mdsToken)
}
}
if err = stage1initcommon.WriteDefaultTarget(p); err != nil {
log.PrintE("failed to write default.target", err)
return 2
}
if err = stage1initcommon.WritePrepareAppTemplate(p); err != nil {
log.PrintE("failed to write prepare-app service template", err)
return 2
}
if err := stage1initcommon.SetJournalPermissions(p); err != nil {
log.PrintE("warning: error setting journal ACLs, you'll need root to read the pod journal", err)
}
if flavor == "kvm" {
if err := KvmPodToSystemd(p, n); err != nil {
log.PrintE("failed to configure systemd for kvm", err)
return 2
}
}
if err = stage1initcommon.PodToSystemd(p, interactive, flavor, privateUsers); err != nil {
log.PrintE("failed to configure systemd", err)
return 2
}
args, env, err := getArgsEnv(p, flavor, debug, n)
if err != nil {
log.Error(err)
return 3
}
// create a separate mount namespace so the cgroup filesystems
// are unmounted when exiting the pod
if err := syscall.Unshare(syscall.CLONE_NEWNS); err != nil {
log.FatalE("error unsharing", err)
}
// we recursively make / a "shared and slave" so mount events from the
// new namespace don't propagate to the host namespace but mount events
// from the host propagate to the new namespace and are forwarded to
// its peer group
// See https://www.kernel.org/doc/Documentation/filesystems/sharedsubtree.txt
if err := syscall.Mount("", "/", "none", syscall.MS_REC|syscall.MS_SLAVE, ""); err != nil {
log.FatalE("error making / a slave mount", err)
}
if err := syscall.Mount("", "/", "none", syscall.MS_REC|syscall.MS_SHARED, ""); err != nil {
log.FatalE("error making / a shared and slave mount", err)
}
enabledCgroups, err := cgroup.GetEnabledCgroups()
if err != nil {
log.FatalE("error getting cgroups", err)
return 5
}
// mount host cgroups in the rkt mount namespace
if err := mountHostCgroups(enabledCgroups); err != nil {
log.FatalE("couldn't mount the host cgroups", err)
return 5
}
var serviceNames []string
for _, app := range p.Manifest.Apps {
serviceNames = append(serviceNames, stage1initcommon.ServiceUnitName(app.Name))
}
s1Root := common.Stage1RootfsPath(p.Root)
machineID := stage1initcommon.GetMachineID(p)
subcgroup, err := getContainerSubCgroup(machineID)
if err == nil {
if err := mountContainerCgroups(s1Root, enabledCgroups, subcgroup, serviceNames); err != nil {
log.PrintE("couldn't mount the container cgroups", err)
return 5
}
} else {
log.PrintE("continuing with per-app isolators disabled", err)
}
if err = stage1common.WritePpid(os.Getpid()); err != nil {
log.Error(err)
return 4
}
err = stage1common.WithClearedCloExec(lfd, func() error {
return syscall.Exec(args[0], args, env)
})
if err != nil {
log.PrintE(fmt.Sprintf("failed to execute %q", args[0]), err)
return 7
}
return 0
}
func stage1() int {
uuid, err := types.NewUUID(flag.Arg(0))
if err != nil {
log.FatalE("UUID is missing or malformed", err)
}
root := "."
p, err := stage1commontypes.LoadPod(root, uuid)
if err != nil {
log.FatalE("failed to load pod", err)
}
// set close-on-exec flag on RKT_LOCK_FD so it gets correctly closed when invoking
// network plugins
lfd, err := common.GetRktLockFD()
if err != nil {
log.FatalE("failed to get rkt lock fd", err)
}
if err := sys.CloseOnExec(lfd, true); err != nil {
log.FatalE("failed to set FD_CLOEXEC on rkt lock", err)
}
mirrorLocalZoneInfo(p.Root)
flavor, _, err := stage1initcommon.GetFlavor(p)
if err != nil {
log.FatalE("failed to get stage1 flavor", err)
}
var n *networking.Networking
if netList.Contained() {
fps, err := commonnet.ForwardedPorts(p.Manifest)
if err != nil {
log.FatalE("error initializing forwarding ports", err)
}
noDNS := dnsConfMode.Pairs["resolv"] != "default" // force ignore CNI DNS results
n, err = networking.Setup(root, p.UUID, fps, netList, localConfig, flavor, noDNS, debug)
if err != nil {
log.FatalE("failed to setup network", err)
}
if err = n.Save(); err != nil {
log.PrintE("failed to save networking state", err)
n.Teardown(flavor, debug)
return 254
}
if len(mdsToken) > 0 {
hostIP, err := n.GetForwardableNetHostIP()
if err != nil {
log.FatalE("failed to get default Host IP", err)
}
p.MetadataServiceURL = common.MetadataServicePublicURL(hostIP, mdsToken)
}
} else {
if flavor == "kvm" {
log.Fatal("flavor kvm requires private network configuration (try --net)")
}
if len(mdsToken) > 0 {
p.MetadataServiceURL = common.MetadataServicePublicURL(localhostIP, mdsToken)
}
}
insecureOptions := stage1initcommon.Stage1InsecureOptions{
DisablePaths: disablePaths,
DisableCapabilities: disableCapabilities,
DisableSeccomp: disableSeccomp,
}
mnt := fs.NewLoggingMounter(
fs.MounterFunc(syscall.Mount),
fs.UnmounterFunc(syscall.Unmount),
diag.Printf,
)
if dnsConfMode.Pairs["resolv"] == "host" {
stage1initcommon.UseHostResolv(mnt, root)
}
if dnsConfMode.Pairs["hosts"] == "host" {
stage1initcommon.UseHostHosts(mnt, root)
}
if mutable {
if err = stage1initcommon.MutableEnv(p); err != nil {
log.FatalE("cannot initialize mutable environment", err)
}
} else {
if err = stage1initcommon.ImmutableEnv(p, interactive, privateUsers, insecureOptions); err != nil {
log.FatalE("cannot initialize immutable environment", err)
}
}
if err := stage1initcommon.SetJournalPermissions(p); err != nil {
log.PrintE("warning: error setting journal ACLs, you'll need root to read the pod journal", err)
}
if flavor == "kvm" {
kvm.InitDebug(debug)
if err := KvmNetworkingToSystemd(p, n); err != nil {
log.FatalE("failed to configure systemd for kvm", err)
}
}
canMachinedRegister := false
if flavor != "kvm" {
// kvm doesn't register with systemd right now, see #2664.
canMachinedRegister = machinedRegister()
}
diag.Printf("canMachinedRegister %t", canMachinedRegister)
args, env, err := getArgsEnv(p, flavor, canMachinedRegister, debug, n, insecureOptions)
if err != nil {
log.FatalE("cannot get environment", err)
}
diag.Printf("args %q", args)
diag.Printf("env %q", env)
// create a separate mount namespace so the cgroup filesystems
// are unmounted when exiting the pod
if err := syscall.Unshare(syscall.CLONE_NEWNS); err != nil {
log.FatalE("error unsharing", err)
}
// we recursively make / a "shared and slave" so mount events from the
// new namespace don't propagate to the host namespace but mount events
// from the host propagate to the new namespace and are forwarded to
// its peer group
// See https://www.kernel.org/doc/Documentation/filesystems/sharedsubtree.txt
if err := mnt.Mount("", "/", "none", syscall.MS_REC|syscall.MS_SLAVE, ""); err != nil {
log.FatalE("error making / a slave mount", err)
}
if err := mnt.Mount("", "/", "none", syscall.MS_REC|syscall.MS_SHARED, ""); err != nil {
log.FatalE("error making / a shared and slave mount", err)
}
unifiedCgroup, err := cgroup.IsCgroupUnified("/")
if err != nil {
log.FatalE("error determining cgroup version", err)
}
diag.Printf("unifiedCgroup %t", unifiedCgroup)
s1Root := common.Stage1RootfsPath(p.Root)
machineID := stage1initcommon.GetMachineID(p)
subcgroup, err := getContainerSubCgroup(machineID, canMachinedRegister, unifiedCgroup)
if err != nil {
log.FatalE("error getting container subcgroup", err)
}
diag.Printf("subcgroup %q", subcgroup)
if err := ioutil.WriteFile(filepath.Join(p.Root, "subcgroup"),
[]byte(fmt.Sprintf("%s", subcgroup)), 0644); err != nil {
log.FatalE("cannot write subcgroup file", err)
}
if !unifiedCgroup {
enabledCgroups, err := v1.GetEnabledCgroups()
if err != nil {
log.FatalE("error getting v1 cgroups", err)
}
diag.Printf("enabledCgroups %q", enabledCgroups)
if err := mountHostV1Cgroups(mnt, enabledCgroups); err != nil {
log.FatalE("couldn't mount the host v1 cgroups", err)
}
if !canMachinedRegister {
if err := v1.JoinSubcgroup("systemd", subcgroup); err != nil {
log.FatalE(fmt.Sprintf("error joining subcgroup %q", subcgroup), err)
}
}
var serviceNames []string
for _, app := range p.Manifest.Apps {
serviceNames = append(serviceNames, stage1initcommon.ServiceUnitName(app.Name))
}
diag.Printf("serviceNames %q", serviceNames)
if err := mountContainerV1Cgroups(mnt, s1Root, enabledCgroups, subcgroup, serviceNames, insecureOptions); err != nil {
log.FatalE("couldn't mount the container v1 cgroups", err)
}
}
// KVM flavor has a bit different logic in handling pid vs ppid, for details look into #2389
// it doesn't require the existence of a "ppid", instead it registers the current pid (which
// will be reused by lkvm binary) as a pod process pid used during entering
pid_filename := "ppid"
if flavor == "kvm" {
pid_filename = "pid"
}
if err = stage1common.WritePid(os.Getpid(), pid_filename); err != nil {
log.FatalE("error writing pid", err)
}
if flavor == "kvm" {
if err := KvmPrepareMounts(s1Root, p); err != nil {
log.FatalE("error preparing mounts", err)
}
}
err = stage1common.WithClearedCloExec(lfd, func() error {
return syscall.Exec(args[0], args, env)
})
if err != nil {
log.FatalE(fmt.Sprintf("failed to execute %q", args[0]), err)
}
return 0
}
func stage1() int {
uuid, err := types.NewUUID(flag.Arg(0))
if err != nil {
log.Print("UUID is missing or malformed\n")
return 1
}
root := "."
p, err := stage1commontypes.LoadPod(root, uuid)
if err != nil {
log.PrintE("can't load pod", err)
return 1
}
// Sanity checks
if len(p.Manifest.Apps) != 1 {
log.Printf("flavor %q only supports 1 application per Pod for now", flavor)
return 1
}
ra := p.Manifest.Apps[0]
imgName := p.AppNameToImageName(ra.Name)
args := ra.App.Exec
if len(args) == 0 {
log.Printf(`image %q has an empty "exec" (try --exec=BINARY)`, imgName)
return 1
}
lfd, err := common.GetRktLockFD()
if err != nil {
log.PrintE("can't get rkt lock fd", err)
return 1
}
// set close-on-exec flag on RKT_LOCK_FD so it gets correctly closed after execution is finished
if err := sys.CloseOnExec(lfd, true); err != nil {
log.PrintE("can't set FD_CLOEXEC on rkt lock", err)
return 1
}
workDir := "/"
if ra.App.WorkingDirectory != "" {
workDir = ra.App.WorkingDirectory
}
env := []string{"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"}
for _, e := range ra.App.Environment {
env = append(env, e.Name+"="+e.Value)
}
rfs := filepath.Join(common.AppPath(p.Root, ra.Name), "rootfs")
if err := copyResolv(p); err != nil {
log.PrintE("can't copy /etc/resolv.conf", err)
return 1
}
argFlyMounts, err := evaluateMounts(rfs, string(ra.Name), p)
if err != nil {
log.PrintE("can't evaluate mounts", err)
return 1
}
effectiveMounts := append(
[]flyMount{
{"", "", "/dev", "none", syscall.MS_REC | syscall.MS_SHARED},
{"/dev", rfs, "/dev", "none", syscall.MS_BIND | syscall.MS_REC},
{"", "", "/proc", "none", syscall.MS_REC | syscall.MS_SHARED},
{"/proc", rfs, "/proc", "none", syscall.MS_BIND | syscall.MS_REC},
{"", "", "/sys", "none", syscall.MS_REC | syscall.MS_SHARED},
{"/sys", rfs, "/sys", "none", syscall.MS_BIND | syscall.MS_REC},
{"tmpfs", rfs, "/tmp", "tmpfs", 0},
},
argFlyMounts...,
)
for _, mount := range effectiveMounts {
var (
err error
hostPathInfo os.FileInfo
targetPathInfo os.FileInfo
)
if strings.HasPrefix(mount.HostPath, "/") {
if hostPathInfo, err = os.Stat(mount.HostPath); err != nil {
log.PrintE(fmt.Sprintf("stat of host path %s", mount.HostPath), err)
return 1
}
} else {
hostPathInfo = nil
}
absTargetPath := filepath.Join(mount.TargetPrefixPath, mount.RelTargetPath)
if targetPathInfo, err = os.Stat(absTargetPath); err != nil && !os.IsNotExist(err) {
log.PrintE(fmt.Sprintf("stat of target path %s", absTargetPath), err)
return 1
}
switch {
case targetPathInfo == nil:
absTargetPathParent, _ := filepath.Split(absTargetPath)
if err := os.MkdirAll(absTargetPathParent, 0755); err != nil {
log.PrintE(fmt.Sprintf("can't create directory %q", absTargetPath), err)
return 1
}
switch {
case hostPathInfo == nil || hostPathInfo.IsDir():
if err := os.Mkdir(absTargetPath, 0755); err != nil {
log.PrintE(fmt.Sprintf("can't create directory %q", absTargetPath), err)
return 1
}
case !hostPathInfo.IsDir():
file, err := os.OpenFile(absTargetPath, os.O_CREATE, 0700)
if err != nil {
log.PrintE(fmt.Sprintf("can't create file %q", absTargetPath), err)
return 1
}
file.Close()
}
case hostPathInfo != nil:
switch {
case hostPathInfo.IsDir() && !targetPathInfo.IsDir():
log.Printf("can't mount because %q is a directory while %q is not", mount.HostPath, absTargetPath)
return 1
case !hostPathInfo.IsDir() && targetPathInfo.IsDir():
log.Printf("can't mount because %q is not a directory while %q is", mount.HostPath, absTargetPath)
return 1
}
}
if err := syscall.Mount(mount.HostPath, absTargetPath, mount.Fs, mount.Flags, ""); err != nil {
log.PrintE(fmt.Sprintf("can't mount %q on %q with flags %v", mount.HostPath, absTargetPath, mount.Flags), err)
return 1
}
}
if err = stage1common.WritePid(os.Getpid(), "pid"); err != nil {
log.Error(err)
return 1
}
var uidResolver, gidResolver user.Resolver
var uid, gid int
uidResolver, err = user.NumericIDs(ra.App.User)
if err != nil {
uidResolver, err = user.IDsFromStat(rfs, ra.App.User, nil)
}
if err != nil { // give up
log.PrintE(fmt.Sprintf("invalid user %q", ra.App.User), err)
return 1
}
if uid, _, err = uidResolver.IDs(); err != nil {
log.PrintE(fmt.Sprintf("failed to configure user %q", ra.App.User), err)
return 1
}
gidResolver, err = user.NumericIDs(ra.App.Group)
if err != nil {
gidResolver, err = user.IDsFromStat(rfs, ra.App.Group, nil)
}
if err != nil { // give up
log.PrintE(fmt.Sprintf("invalid group %q", ra.App.Group), err)
return 1
}
if _, gid, err = gidResolver.IDs(); err != nil {
log.PrintE(fmt.Sprintf("failed to configure group %q", ra.App.Group), err)
return 1
}
diag.Printf("chroot to %q", rfs)
if err := syscall.Chroot(rfs); err != nil {
log.PrintE("can't chroot", err)
return 1
}
if err := os.Chdir(workDir); err != nil {
log.PrintE(fmt.Sprintf("can't change to working directory %q", workDir), err)
return 1
}
// lock the current goroutine to its current OS thread.
// This will force the subsequent syscalls to be executed in the same OS thread as Setresuid, and Setresgid,
// see https://github.com/golang/go/issues/1435#issuecomment-66054163.
runtime.LockOSThread()
diag.Printf("setting uid %d gid %d", uid, gid)
if err := syscall.Setresgid(gid, gid, gid); err != nil {
log.PrintE(fmt.Sprintf("can't set gid %d", gid), err)
return 1
}
if err := syscall.Setresuid(uid, uid, uid); err != nil {
log.PrintE(fmt.Sprintf("can't set uid %d", uid), err)
return 1
}
diag.Printf("execing %q in %q", args, rfs)
err = stage1common.WithClearedCloExec(lfd, func() error {
return syscall.Exec(args[0], args, env)
})
if err != nil {
log.PrintE(fmt.Sprintf("can't execute %q", args[0]), err)
return 1
}
return 0
}
func stage1() int {
uuid, err := types.NewUUID(flag.Arg(0))
if err != nil {
fmt.Fprintln(os.Stderr, "UUID is missing or malformed")
return 1
}
root := "."
p, err := LoadPod(root, uuid)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to load pod: %v\n", err)
return 1
}
// set close-on-exec flag on RKT_LOCK_FD so it gets correctly closed when invoking
// network plugins
lfd, err := common.GetRktLockFD()
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to get rkt lock fd: %v\n", err)
return 1
}
if err := sys.CloseOnExec(lfd, true); err != nil {
fmt.Fprintf(os.Stderr, "Failed to set FD_CLOEXEC on rkt lock: %v\n", err)
return 1
}
mirrorLocalZoneInfo(p.Root)
flavor, _, err := p.getFlavor()
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to get stage1 flavor: %v\n", err)
return 3
}
var n *networking.Networking
if privNet.Any() {
fps, err := forwardedPorts(p)
if err != nil {
fmt.Fprintln(os.Stderr, err.Error())
return 6
}
n, err = networking.Setup(root, p.UUID, fps, privNet, localConfig, flavor)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to setup network: %v\n", err)
return 6
}
if err = n.Save(); err != nil {
fmt.Fprintf(os.Stderr, "Failed to save networking state %v\n", err)
n.Teardown(flavor)
return 6
}
if len(mdsToken) > 0 {
hostIP, err := n.GetDefaultHostIP()
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to get default Host IP: %v\n", err)
return 6
}
p.MetadataServiceURL = common.MetadataServicePublicURL(hostIP, mdsToken)
}
} else {
if flavor == "kvm" {
fmt.Fprintf(os.Stderr, "Flavor kvm requires private network configuration (try --private-net).\n")
return 6
}
if len(mdsToken) > 0 {
p.MetadataServiceURL = common.MetadataServicePublicURL(localhostIP, mdsToken)
}
}
if err = p.WritePrepareAppTemplate(); err != nil {
fmt.Fprintf(os.Stderr, "Failed to write prepare-app service template: %v\n", err)
return 2
}
if err = p.PodToSystemd(interactive, flavor); err != nil {
fmt.Fprintf(os.Stderr, "Failed to configure systemd: %v\n", err)
return 2
}
args, env, err := getArgsEnv(p, flavor, debug, n)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
return 3
}
// create a separate mount namespace so the cgroup filesystems
// are unmounted when exiting the pod
if err := syscall.Unshare(syscall.CLONE_NEWNS); err != nil {
log.Fatalf("error unsharing: %v", err)
}
// we recursively make / a "shared and slave" so mount events from the
// new namespace don't propagate to the host namespace but mount events
// from the host propagate to the new namespace and are forwarded to
// its peer group
// See https://www.kernel.org/doc/Documentation/filesystems/sharedsubtree.txt
if err := syscall.Mount("", "/", "none", syscall.MS_REC|syscall.MS_SLAVE, ""); err != nil {
log.Fatalf("error making / a slave mount: %v", err)
}
if err := syscall.Mount("", "/", "none", syscall.MS_REC|syscall.MS_SHARED, ""); err != nil {
log.Fatalf("error making / a shared and slave mount: %v", err)
}
var serviceNames []string
for _, app := range p.Manifest.Apps {
serviceNames = append(serviceNames, ServiceUnitName(app.Name))
}
s1Root := common.Stage1RootfsPath(p.Root)
machineID := p.GetMachineID()
subcgroup, err := getContainerSubCgroup(machineID)
if err == nil {
if err := cgroup.CreateCgroups(s1Root, subcgroup, serviceNames); err != nil {
fmt.Fprintf(os.Stderr, "Error creating cgroups: %v\n", err)
return 5
}
} else {
fmt.Fprintf(os.Stderr, "Continuing with per-app isolators disabled: %v\n", err)
}
if err = writePpid(os.Getpid()); err != nil {
fmt.Fprintln(os.Stderr, err.Error())
return 4
}
err = withClearedCloExec(lfd, func() error {
return syscall.Exec(args[0], args, env)
})
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to execute %q: %v\n", args[0], err)
return 7
}
return 0
}
func stage1() int {
uuid, err := types.NewUUID(flag.Arg(0))
if err != nil {
log.Print("UUID is missing or malformed\n")
return 1
}
root := "."
p, err := stage1commontypes.LoadPod(root, uuid)
if err != nil {
log.PrintE("can't load pod", err)
return 1
}
if len(p.Manifest.Apps) != 1 {
log.Printf("flavor %q only supports 1 application per Pod for now", flavor)
return 1
}
lfd, err := common.GetRktLockFD()
if err != nil {
log.PrintE("can't get rkt lock fd", err)
return 1
}
// set close-on-exec flag on RKT_LOCK_FD so it gets correctly closed after execution is finished
if err := sys.CloseOnExec(lfd, true); err != nil {
log.PrintE("can't set FD_CLOEXEC on rkt lock", err)
return 1
}
env := []string{"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"}
for _, e := range p.Manifest.Apps[0].App.Environment {
env = append(env, e.Name+"="+e.Value)
}
args := p.Manifest.Apps[0].App.Exec
rfs := filepath.Join(common.AppPath(p.Root, p.Manifest.Apps[0].Name), "rootfs")
argFlyMounts, err := evaluateMounts(rfs, string(p.Manifest.Apps[0].Name), p)
if err != nil {
log.PrintE("can't evaluate mounts", err)
return 1
}
effectiveMounts := append(
[]flyMount{
{"", "", "/dev", "none", syscall.MS_REC | syscall.MS_SHARED},
{"/dev", rfs, "/dev", "none", syscall.MS_BIND | syscall.MS_REC},
{"", "", "/proc", "none", syscall.MS_REC | syscall.MS_SHARED},
{"/proc", rfs, "/proc", "none", syscall.MS_BIND | syscall.MS_REC},
{"", "", "/sys", "none", syscall.MS_REC | syscall.MS_SHARED},
{"/sys", rfs, "/sys", "none", syscall.MS_BIND | syscall.MS_REC},
{"tmpfs", rfs, "/tmp", "tmpfs", 0},
},
argFlyMounts...,
)
for _, mount := range effectiveMounts {
var (
err error
hostPathInfo os.FileInfo
targetPathInfo os.FileInfo
)
if strings.HasPrefix(mount.HostPath, "/") {
if hostPathInfo, err = os.Stat(mount.HostPath); err != nil {
log.PrintE(fmt.Sprintf("stat of host directory %s", mount.HostPath), err)
return 1
}
} else {
hostPathInfo = nil
}
absTargetPath := filepath.Join(mount.TargetPrefixPath, mount.RelTargetPath)
if targetPathInfo, err = os.Stat(absTargetPath); err != nil && !os.IsNotExist(err) {
log.PrintE(fmt.Sprintf("stat of target directory %s", absTargetPath), err)
return 1
}
switch {
case targetPathInfo == nil:
absTargetPathParent, _ := filepath.Split(absTargetPath)
if err := os.MkdirAll(absTargetPathParent, 0700); err != nil {
log.PrintE(fmt.Sprintf("can't create directory %q", absTargetPath), err)
return 1
}
switch {
case hostPathInfo == nil || hostPathInfo.IsDir():
if err := os.Mkdir(absTargetPath, 0700); err != nil {
log.PrintE(fmt.Sprintf("can't create directory %q", absTargetPath), err)
return 1
}
case !hostPathInfo.IsDir():
file, err := os.OpenFile(absTargetPath, os.O_CREATE, 0700)
if err != nil {
log.PrintE(fmt.Sprintf("can't create file %q", absTargetPath), err)
return 1
}
file.Close()
}
case hostPathInfo != nil:
switch {
case hostPathInfo.IsDir() && !targetPathInfo.IsDir():
log.Printf("can't mount because %q is a directory while %q is not", mount.HostPath, absTargetPath)
return 1
case !hostPathInfo.IsDir() && targetPathInfo.IsDir():
log.Printf("can't mount because %q is not a directory while %q is", mount.HostPath, absTargetPath)
return 1
}
}
if err := syscall.Mount(mount.HostPath, absTargetPath, mount.Fs, mount.Flags, ""); err != nil {
log.PrintE(fmt.Sprintf("can't mount %q on %q with flags %v", mount.HostPath, absTargetPath, mount.Flags), err)
return 1
}
}
if err = stage1common.WritePpid(os.Getpid()); err != nil {
log.Error(err)
return 4
}
diag.Printf("chroot to %q", rfs)
if err := syscall.Chroot(rfs); err != nil {
log.PrintE("can't chroot", err)
return 1
}
if err := os.Chdir("/"); err != nil {
log.PrintE("can't change to root new directory", err)
return 1
}
diag.Printf("execing %q in %q", args, rfs)
err = stage1common.WithClearedCloExec(lfd, func() error {
return syscall.Exec(args[0], args, env)
})
if err != nil {
log.PrintE(fmt.Sprintf("can't execute %q", args[0]), err)
return 7
}
return 0
}
func stage1(rp *stage1commontypes.RuntimePod) int {
uuid, err := types.NewUUID(flag.Arg(0))
if err != nil {
log.Print("UUID is missing or malformed\n")
return 254
}
root := "."
p, err := stage1commontypes.LoadPod(root, uuid, rp)
if err != nil {
log.PrintE("can't load pod", err)
return 254
}
if err := p.SaveRuntime(); err != nil {
log.FatalE("failed to save runtime parameters", err)
}
// Sanity checks
if len(p.Manifest.Apps) != 1 {
log.Printf("flavor %q only supports 1 application per Pod for now", flavor)
return 254
}
ra := p.Manifest.Apps[0]
imgName := p.AppNameToImageName(ra.Name)
args := ra.App.Exec
if len(args) == 0 {
log.Printf(`image %q has an empty "exec" (try --exec=BINARY)`, imgName)
return 254
}
lfd, err := common.GetRktLockFD()
if err != nil {
log.PrintE("can't get rkt lock fd", err)
return 254
}
// set close-on-exec flag on RKT_LOCK_FD so it gets correctly closed after execution is finished
if err := sys.CloseOnExec(lfd, true); err != nil {
log.PrintE("can't set FD_CLOEXEC on rkt lock", err)
return 254
}
workDir := "/"
if ra.App.WorkingDirectory != "" {
workDir = ra.App.WorkingDirectory
}
env := []string{"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"}
for _, e := range ra.App.Environment {
env = append(env, e.Name+"="+e.Value)
}
rfs := filepath.Join(common.AppPath(p.Root, ra.Name), "rootfs")
argFlyMounts, err := evaluateMounts(rfs, string(ra.Name), p)
if err != nil {
log.PrintE("can't evaluate mounts", err)
return 254
}
effectiveMounts := append(
[]flyMount{
{"", "", "/dev", "none", syscall.MS_REC | syscall.MS_SHARED},
{"/dev", rfs, "/dev", "none", syscall.MS_BIND | syscall.MS_REC},
{"", "", "/proc", "none", syscall.MS_REC | syscall.MS_SHARED},
{"/proc", rfs, "/proc", "none", syscall.MS_BIND | syscall.MS_REC},
{"", "", "/sys", "none", syscall.MS_REC | syscall.MS_SHARED},
{"/sys", rfs, "/sys", "none", syscall.MS_BIND | syscall.MS_REC},
{"tmpfs", rfs, "/tmp", "tmpfs", 0},
},
argFlyMounts...,
)
/* Process DNS config files
*
* /etc/resolv.conf: four modes
* 'host' - bind-mount host's file
* 'stage0' - bind-mount the file created by stage0
* 'default' - do nothing (we would respect CNI if fly had networking)
* 'none' - do nothing
*/
switch p.ResolvConfMode {
case "host":
effectiveMounts = append(effectiveMounts,
flyMount{"/etc/resolv.conf", rfs, "/etc/resolv.conf", "none", syscall.MS_BIND | syscall.MS_RDONLY})
case "stage0":
if err := copyResolv(p); err != nil {
log.PrintE("can't copy /etc/resolv.conf", err)
return 254
}
}
/*
* /etc/hosts: three modes:
* 'host' - bind-mount hosts's file
* 'stage0' - bind mount the file created by stage1
* 'default' - create a stub /etc/hosts if needed
*/
switch p.EtcHostsMode {
case "host":
effectiveMounts = append(effectiveMounts,
flyMount{"/etc/hosts", rfs, "/etc/hosts", "none", syscall.MS_BIND | syscall.MS_RDONLY})
case "stage0":
effectiveMounts = append(effectiveMounts, flyMount{
filepath.Join(common.Stage1RootfsPath(p.Root), "etc", "rkt-hosts"),
rfs,
"/etc/hosts",
"none",
syscall.MS_BIND | syscall.MS_RDONLY})
case "default":
stage2HostsPath := filepath.Join(common.AppRootfsPath(p.Root, ra.Name), "etc", "hosts")
if _, err := os.Stat(stage2HostsPath); err != nil && os.IsNotExist(err) {
fallbackHosts := []byte("127.0.0.1 localhost localdomain\n")
ioutil.WriteFile(stage2HostsPath, fallbackHosts, 0644)
}
}
for _, mount := range effectiveMounts {
diag.Printf("Processing %+v", mount)
var (
err error
hostPathInfo os.FileInfo
targetPathInfo os.FileInfo
)
if strings.HasPrefix(mount.HostPath, "/") {
if hostPathInfo, err = os.Stat(mount.HostPath); err != nil {
log.PrintE(fmt.Sprintf("stat of host path %s", mount.HostPath), err)
return 254
}
} else {
hostPathInfo = nil
}
absTargetPath := filepath.Join(mount.TargetPrefixPath, mount.RelTargetPath)
if targetPathInfo, err = os.Stat(absTargetPath); err != nil && !os.IsNotExist(err) {
log.PrintE(fmt.Sprintf("stat of target path %s", absTargetPath), err)
return 254
}
switch {
case (mount.Flags & syscall.MS_REMOUNT) != 0:
{
diag.Printf("don't attempt to create files for remount of %q", absTargetPath)
}
case targetPathInfo == nil:
absTargetPathParent, _ := filepath.Split(absTargetPath)
if err := os.MkdirAll(absTargetPathParent, 0755); err != nil {
log.PrintE(fmt.Sprintf("can't create directory %q", absTargetPath), err)
return 254
}
switch {
case hostPathInfo == nil || hostPathInfo.IsDir():
if err := os.Mkdir(absTargetPath, 0755); err != nil {
log.PrintE(fmt.Sprintf("can't create directory %q", absTargetPath), err)
return 254
}
case !hostPathInfo.IsDir():
file, err := os.OpenFile(absTargetPath, os.O_CREATE, 0700)
if err != nil {
log.PrintE(fmt.Sprintf("can't create file %q", absTargetPath), err)
return 254
}
file.Close()
}
case hostPathInfo != nil:
switch {
case hostPathInfo.IsDir() && !targetPathInfo.IsDir():
log.Printf("can't mount because %q is a directory while %q is not", mount.HostPath, absTargetPath)
return 254
case !hostPathInfo.IsDir() && targetPathInfo.IsDir():
log.Printf("can't mount because %q is not a directory while %q is", mount.HostPath, absTargetPath)
return 254
}
}
if err := syscall.Mount(mount.HostPath, absTargetPath, mount.Fs, mount.Flags, ""); err != nil {
log.PrintE(fmt.Sprintf("can't mount %q on %q with flags %v", mount.HostPath, absTargetPath, mount.Flags), err)
return 254
}
}
if err = stage1common.WritePid(os.Getpid(), "pid"); err != nil {
log.Error(err)
return 254
}
var uidResolver, gidResolver user.Resolver
var uid, gid int
uidResolver, err = user.NumericIDs(ra.App.User)
if err != nil {
uidResolver, err = user.IDsFromStat(rfs, ra.App.User, nil)
}
if err != nil { // give up
log.PrintE(fmt.Sprintf("invalid user %q", ra.App.User), err)
return 254
}
if uid, _, err = uidResolver.IDs(); err != nil {
log.PrintE(fmt.Sprintf("failed to configure user %q", ra.App.User), err)
return 254
}
gidResolver, err = user.NumericIDs(ra.App.Group)
if err != nil {
gidResolver, err = user.IDsFromStat(rfs, ra.App.Group, nil)
}
if err != nil { // give up
log.PrintE(fmt.Sprintf("invalid group %q", ra.App.Group), err)
return 254
}
if _, gid, err = gidResolver.IDs(); err != nil {
log.PrintE(fmt.Sprintf("failed to configure group %q", ra.App.Group), err)
return 254
}
diag.Printf("chroot to %q", rfs)
if err := syscall.Chroot(rfs); err != nil {
log.PrintE("can't chroot", err)
return 254
}
if err := os.Chdir(workDir); err != nil {
log.PrintE(fmt.Sprintf("can't change to working directory %q", workDir), err)
return 254
}
// lock the current goroutine to its current OS thread.
// This will force the subsequent syscalls to be executed in the same OS thread as Setresuid, and Setresgid,
// see https://github.com/golang/go/issues/1435#issuecomment-66054163.
runtime.LockOSThread()
diag.Printf("setting uid %d gid %d", uid, gid)
if err := syscall.Setresgid(gid, gid, gid); err != nil {
log.PrintE(fmt.Sprintf("can't set gid %d", gid), err)
return 254
}
if err := syscall.Setresuid(uid, uid, uid); err != nil {
log.PrintE(fmt.Sprintf("can't set uid %d", uid), err)
return 254
}
diag.Printf("execing %q in %q", args, rfs)
err = stage1common.WithClearedCloExec(lfd, func() error {
return syscall.Exec(args[0], args, env)
})
if err != nil {
log.PrintE(fmt.Sprintf("can't execute %q", args[0]), err)
return 254
}
return 0
}
func stage1() int {
uuid, err := types.NewUUID(flag.Arg(0))
if err != nil {
fmt.Fprintln(os.Stderr, "UUID is missing or malformed")
return 1
}
root := "."
p, err := LoadPod(root, uuid)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to load pod: %v\n", err)
return 1
}
// set close-on-exec flag on RKT_LOCK_FD so it gets correctly closed when invoking
// network plugins
lfd, err := common.GetRktLockFD()
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to get rkt lock fd: %v\n", err)
return 1
}
if err := sys.CloseOnExec(lfd, true); err != nil {
fmt.Fprintf(os.Stderr, "Failed to set FD_CLOEXEC on rkt lock: %v\n", err)
return 1
}
mirrorLocalZoneInfo(p.Root)
if privNet {
fps, err := forwardedPorts(p)
if err != nil {
fmt.Fprintln(os.Stderr, err.Error())
return 6
}
n, err := networking.Setup(root, p.UUID, fps)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to setup network: %v\n", err)
return 6
}
defer n.Teardown()
if err = n.Save(); err != nil {
fmt.Fprintf(os.Stderr, "Failed to save networking state %v\n", err)
return 6
}
p.MetadataServiceURL = common.MetadataServicePublicURL(n.GetDefaultHostIP())
if err = registerPod(p, n.GetDefaultIP()); err != nil {
fmt.Fprintf(os.Stderr, "Failed to register pod: %v\n", err)
return 6
}
defer unregisterPod(p)
}
if err = p.PodToSystemd(interactive); err != nil {
fmt.Fprintf(os.Stderr, "Failed to configure systemd: %v\n", err)
return 2
}
args, env, err := getArgsEnv(p, debug)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to get execution parameters: %v\n", err)
return 3
}
var execFn func() error
if privNet {
cmd := exec.Cmd{
Path: args[0],
Args: args,
Stdin: os.Stdin,
Stdout: os.Stdout,
Stderr: os.Stderr,
Env: env,
}
execFn = cmd.Run
} else {
execFn = func() error {
return syscall.Exec(args[0], args, env)
}
}
err = withClearedCloExec(lfd, execFn)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to execute nspawn: %v\n", err)
return 5
}
return 0
}
// getArgsEnv returns the nspawn args and env according to the usr used
func getArgsEnv(p *Pod, debug bool) ([]string, []string, error) {
args := []string{}
env := os.Environ()
flavor, err := os.Readlink(filepath.Join(common.Stage1RootfsPath(p.Root), "flavor"))
if err != nil {
return nil, nil, fmt.Errorf("unable to determine stage1 flavor: %v", err)
}
switch flavor {
case "coreos":
// when running the coreos-derived stage1 with unpatched systemd-nspawn we need some ld-linux hackery
args = append(args, filepath.Join(common.Stage1RootfsPath(p.Root), interpBin))
args = append(args, filepath.Join(common.Stage1RootfsPath(p.Root), nspawnBin))
args = append(args, "--boot") // Launch systemd in the pod
// Note: the coreos flavor uses systemd-nspawn v215 but machinedRegister()
// checks for the nspawn registration method used since v216. So we will
// not register when the host has systemd v215.
if machinedRegister() {
args = append(args, fmt.Sprintf("--register=true"))
} else {
args = append(args, fmt.Sprintf("--register=false"))
}
env = append(env, "LD_PRELOAD="+filepath.Join(common.Stage1RootfsPath(p.Root), "fakesdboot.so"))
env = append(env, "LD_LIBRARY_PATH="+filepath.Join(common.Stage1RootfsPath(p.Root), "usr/lib"))
case "src":
args = append(args, filepath.Join(common.Stage1RootfsPath(p.Root), nspawnBin))
args = append(args, "--boot") // Launch systemd in the pod
out, err := os.Getwd()
if err != nil {
return nil, nil, err
}
lfd, err := common.GetRktLockFD()
if err != nil {
return nil, nil, err
}
args = append(args, fmt.Sprintf("--pid-file=%v", filepath.Join(out, "pid")))
args = append(args, fmt.Sprintf("--keep-fd=%v", lfd))
if machinedRegister() {
args = append(args, fmt.Sprintf("--register=true"))
} else {
args = append(args, fmt.Sprintf("--register=false"))
}
default:
return nil, nil, fmt.Errorf("unrecognized stage1 flavor: %q", flavor)
}
if !debug {
args = append(args, "--quiet") // silence most nspawn output (log_warning is currently not covered by this)
}
nsargs, err := p.PodToNspawnArgs()
if err != nil {
return nil, nil, fmt.Errorf("Failed to generate nspawn args: %v", err)
}
args = append(args, nsargs...)
// Arguments to systemd
args = append(args, "--")
args = append(args, "--default-standard-output=tty") // redirect all service logs straight to tty
if !debug {
args = append(args, "--log-target=null") // silence systemd output inside pod
args = append(args, "--show-status=0") // silence systemd initialization status output
}
return args, env, nil
}
// getArgsEnv returns the nspawn args and env according to the usr used
func getArgsEnv(p *Pod, flavor string, systemdStage1Version string, debug bool) ([]string, []string, error) {
args := []string{}
env := os.Environ()
switch flavor {
case "coreos":
args = append(args, filepath.Join(common.Stage1RootfsPath(p.Root), interpBin))
args = append(args, filepath.Join(common.Stage1RootfsPath(p.Root), nspawnBin))
args = append(args, "--boot") // Launch systemd in the pod
if machinedRegister() {
args = append(args, fmt.Sprintf("--register=true"))
} else {
args = append(args, fmt.Sprintf("--register=false"))
}
// use only dynamic libraries provided in the image
env = append(env, "LD_LIBRARY_PATH="+filepath.Join(common.Stage1RootfsPath(p.Root), "usr/lib"))
case "src":
args = append(args, filepath.Join(common.Stage1RootfsPath(p.Root), nspawnBin))
args = append(args, "--boot") // Launch systemd in the pod
switch systemdStage1Version {
case "v215":
lfd, err := common.GetRktLockFD()
if err != nil {
return nil, nil, err
}
args = append(args, fmt.Sprintf("--keep-fd=%v", lfd))
case "v219":
// --keep-fd is not needed thanks to
// stage1/rootfs/usr_from_src/patches/v219/0005-nspawn-close-extra-fds-before-execing-init.patch
default:
// since systemd-nspawn v220 (commit 6b7d2e, "nspawn: close extra fds
// before execing init"), fds remain open, so --keep-fd is not needed.
}
if machinedRegister() {
args = append(args, fmt.Sprintf("--register=true"))
} else {
args = append(args, fmt.Sprintf("--register=false"))
}
case "host":
hostNspawnBin, err := lookupPath("systemd-nspawn", os.Getenv("PATH"))
if err != nil {
return nil, nil, err
}
// Check dynamically which version is installed on the host
// Support version >= 220
versionBytes, err := exec.Command(hostNspawnBin, "--version").CombinedOutput()
if err != nil {
return nil, nil, fmt.Errorf("unable to probe %s version: %v", hostNspawnBin, err)
}
versionStr := strings.SplitN(string(versionBytes), "\n", 2)[0]
var version int
n, err := fmt.Sscanf(versionStr, "systemd %d", &version)
if err != nil {
return nil, nil, fmt.Errorf("cannot parse version: %q", versionStr)
}
if n != 1 || version < 220 {
return nil, nil, fmt.Errorf("rkt needs systemd-nspawn >= 220. %s version not supported: %v", hostNspawnBin, versionStr)
}
// Copy systemd, bash, etc. in stage1 at run-time
if err := installAssets(); err != nil {
return nil, nil, fmt.Errorf("cannot install assets from the host: %v", err)
}
args = append(args, hostNspawnBin)
args = append(args, "--boot") // Launch systemd in the pod
args = append(args, fmt.Sprintf("--register=true"))
default:
return nil, nil, fmt.Errorf("unrecognized stage1 flavor: %q", flavor)
}
// link journal only if the host is running systemd and stage1 supports
// linking
if util.IsRunningSystemd() && systemdSupportsJournalLinking(systemdStage1Version) {
// we write /etc/machine-id here because systemd-nspawn needs it to link
// the container's journal to the host
mPath := filepath.Join(common.Stage1RootfsPath(p.Root), "etc", "machine-id")
mId := strings.Replace(p.UUID.String(), "-", "", -1)
if err := ioutil.WriteFile(mPath, []byte(mId), 0644); err != nil {
log.Fatalf("error writing /etc/machine-id: %v\n", err)
}
args = append(args, "--link-journal=try-guest")
}
if !debug {
args = append(args, "--quiet") // silence most nspawn output (log_warning is currently not covered by this)
env = append(env, "SYSTEMD_LOG_LEVEL=err") // silence log_warning too
}
keepUnit, err := isRunningFromUnitFile()
if err != nil {
return nil, nil, fmt.Errorf("error determining if we're running from a unit file: %v", err)
}
if keepUnit {
args = append(args, "--keep-unit")
}
nsargs, err := p.PodToNspawnArgs()
if err != nil {
return nil, nil, fmt.Errorf("Failed to generate nspawn args: %v", err)
}
args = append(args, nsargs...)
// Arguments to systemd
args = append(args, "--")
args = append(args, "--default-standard-output=tty") // redirect all service logs straight to tty
if !debug {
args = append(args, "--log-target=null") // silence systemd output inside pod
// TODO remove --log-level=warning when we update stage1 to systemd v222
args = append(args, "--log-level=warning") // limit log output (systemd-shutdown ignores --log-target)
args = append(args, "--show-status=0") // silence systemd initialization status output
}
return args, env, nil
}
func stage1() int {
uuid, err := types.NewUUID(flag.Arg(0))
if err != nil {
fmt.Fprintln(os.Stderr, "UUID is missing or malformed")
return 1
}
root := "."
p, err := LoadPod(root, uuid)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to load pod: %v\n", err)
return 1
}
// set close-on-exec flag on RKT_LOCK_FD so it gets correctly closed when invoking
// network plugins
lfd, err := common.GetRktLockFD()
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to get rkt lock fd: %v\n", err)
return 1
}
if err := sys.CloseOnExec(lfd, true); err != nil {
fmt.Fprintf(os.Stderr, "Failed to set FD_CLOEXEC on rkt lock: %v\n", err)
return 1
}
mirrorLocalZoneInfo(p.Root)
if privNet.Any() {
fps, err := forwardedPorts(p)
if err != nil {
fmt.Fprintln(os.Stderr, err.Error())
return 6
}
n, err := networking.Setup(root, p.UUID, fps, privNet)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to setup network: %v\n", err)
return 6
}
defer n.Teardown()
if err = n.Save(); err != nil {
fmt.Fprintf(os.Stderr, "Failed to save networking state %v\n", err)
return 6
}
hostIP, err := n.GetDefaultHostIP()
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to get default Host IP: %v\n", err)
return 6
}
mdsToken, err := generateMDSToken()
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to generate MDS token: %v", err)
return 8
}
p.MetadataServiceURL = common.MetadataServicePublicURL(hostIP, mdsToken)
if err = registerPod(p, mdsToken); err != nil {
fmt.Fprintf(os.Stderr, "Failed to register pod: %v\n", err)
return 8
}
defer unregisterPod(p)
}
flavor, systemdStage1Version, err := p.getFlavor()
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to get stage1 flavor: %v\n", err)
return 3
}
if err = p.WritePrepareAppTemplate(systemdStage1Version); err != nil {
fmt.Fprintf(os.Stderr, "Failed to write prepare-app service template: %v\n", err)
return 2
}
if err = p.PodToSystemd(interactive); err != nil {
fmt.Fprintf(os.Stderr, "Failed to configure systemd: %v\n", err)
return 2
}
args, env, err := getArgsEnv(p, flavor, systemdStage1Version, debug)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
return 3
}
appHashes := p.GetAppHashes()
s1Root := common.Stage1RootfsPath(p.Root)
machineID := p.GetMachineID()
subcgroup, err := getContainerSubCgroup(machineID)
if err == nil {
if err := cgroup.CreateCgroups(s1Root, subcgroup, appHashes); err != nil {
fmt.Fprintf(os.Stderr, "Error creating cgroups: %v\n", err)
return 5
}
} else {
fmt.Fprintf(os.Stderr, "Continuing with per-app isolators disabled: %v\n", err)
}
var execFn func() error
if privNet.Any() {
cmd := exec.Cmd{
Path: args[0],
Args: args,
Stdin: os.Stdin,
Stdout: os.Stdout,
Stderr: os.Stderr,
Env: env,
}
execFn = func() error {
err = cmd.Start()
if err != nil {
return fmt.Errorf("Failed to start nspawn: %v\n", err)
}
if err = writePpid(cmd.Process.Pid); err != nil {
return err
}
return cmd.Wait()
}
} else {
if err = writePpid(os.Getpid()); err != nil {
fmt.Fprintln(os.Stderr, err.Error())
return 4
}
execFn = func() error {
return syscall.Exec(args[0], args, env)
}
}
err = withClearedCloExec(lfd, execFn)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to execute nspawn: %v\n", err)
return 7
}
return 0
}
