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Strongly type exec driver context

Browse source 
This also removes dead code in the native driver for a past feature that
was never fully implemented.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
This commit is contained in:
Michael Crosby 2014-09-29 22:40:26 +00:00
parent 7c1aee6291
commit 32dca1a7b0
10 changed files with 53 additions and 464 deletions
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17
daemon/container.go
View file

@ -195,14 +195,7 @@ func (container *Container) getRootResourcePath(path string) (string, error) {
}
func populateCommand(c *Container, env []string) error {
var (
en *execdriver.Network
context = make(map[string][]string)
)
context["process_label"] = []string{c.GetProcessLabel()}
context["mount_label"] = []string{c.GetMountLabel()}
en = &execdriver.Network{
en := &execdriver.Network{
Mtu: c.daemon.config.Mtu,
Interface: nil,
}
@ -247,7 +240,7 @@ func populateCommand(c *Container, env []string) error {
autoCreatedDevices := append(devices.DefaultAutoCreatedDevices, userSpecifiedDevices...)
// TODO: this can be removed after lxc-conf is fully deprecated
mergeLxcConfIntoOptions(c.hostConfig, context)
lxcConfig := mergeLxcConfIntoOptions(c.hostConfig)
resources := &execdriver.Resources{
Memory: c.Config.Memory,
@ -263,21 +256,25 @@ func populateCommand(c *Container, env []string) error {
Tty: c.Config.Tty,
User: c.Config.User,
}
processConfig.SysProcAttr = &syscall.SysProcAttr{Setsid: true}
processConfig.Env = env
c.command = &execdriver.Command{
ID: c.ID,
Rootfs: c.RootfsPath(),
InitPath: "/.dockerinit",
WorkingDir: c.Config.WorkingDir,
Network: en,
Config: context,
Resources: resources,
AllowedDevices: allowedDevices,
AutoCreatedDevices: autoCreatedDevices,
CapAdd: c.hostConfig.CapAdd,
CapDrop: c.hostConfig.CapDrop,
ProcessConfig: processConfig,
ProcessLabel: c.GetProcessLabel(),
MountLabel: c.GetMountLabel(),
LxcConfig: lxcConfig,
}
return nil

32
daemon/execdriver/driver.go
View file

@ -99,19 +99,21 @@ type ProcessConfig struct {
// Process wrapps an os/exec.Cmd to add more metadata
type Command struct {
ID string `json:"id"`
Rootfs string `json:"rootfs"` // root fs of the container
InitPath string `json:"initpath"` // dockerinit
WorkingDir string `json:"working_dir"`
ConfigPath string `json:"config_path"` // this should be able to be removed when the lxc template is moved into the driver
Network *Network `json:"network"`
Config map[string][]string `json:"config"` // generic values that specific drivers can consume
Resources *Resources `json:"resources"`
Mounts []Mount `json:"mounts"`
AllowedDevices []*devices.Device `json:"allowed_devices"`
AutoCreatedDevices []*devices.Device `json:"autocreated_devices"`
CapAdd []string `json:"cap_add"`
CapDrop []string `json:"cap_drop"`
ContainerPid int `json:"container_pid"` // the pid for the process inside a container
ProcessConfig ProcessConfig `json:"process_config"` // Describes the init process of the container.
ID string `json:"id"`
Rootfs string `json:"rootfs"` // root fs of the container
InitPath string `json:"initpath"` // dockerinit
WorkingDir string `json:"working_dir"`
ConfigPath string `json:"config_path"` // this should be able to be removed when the lxc template is moved into the driver
Network *Network `json:"network"`
Resources *Resources `json:"resources"`
Mounts []Mount `json:"mounts"`
AllowedDevices []*devices.Device `json:"allowed_devices"`
AutoCreatedDevices []*devices.Device `json:"autocreated_devices"`
CapAdd []string `json:"cap_add"`
CapDrop []string `json:"cap_drop"`
ContainerPid int `json:"container_pid"` // the pid for the process inside a container
ProcessConfig ProcessConfig `json:"process_config"` // Describes the init process of the container.
ProcessLabel string `json:"process_label"`
MountLabel string `json:"mount_label"`
LxcConfig []string `json:"lxc_config"`
}

26
daemon/execdriver/lxc/driver.go
View file

@ -22,7 +22,6 @@ import (
"github.com/docker/docker/pkg/term"
"github.com/docker/docker/utils"
"github.com/docker/libcontainer/cgroups"
"github.com/docker/libcontainer/label"
"github.com/docker/libcontainer/mount/nodes"
)
@ -410,37 +409,24 @@ func rootIsShared() bool {
}
func (d *driver) generateLXCConfig(c *execdriver.Command) (string, error) {
var (
process, mount string
root = path.Join(d.root, "containers", c.ID, "config.lxc")
labels = c.Config["label"]
)
root := path.Join(d.root, "containers", c.ID, "config.lxc")
fo, err := os.Create(root)
if err != nil {
return "", err
}
defer fo.Close()
if len(labels) > 0 {
process, mount, err = label.GenLabels(labels[0])
if err != nil {
return "", err
}
}
if err := LxcTemplateCompiled.Execute(fo, struct {
*execdriver.Command
AppArmor bool
ProcessLabel string
MountLabel string
AppArmor bool
}{
Command: c,
AppArmor: d.apparmor,
ProcessLabel: process,
MountLabel: mount,
Command: c,
AppArmor: d.apparmor,
}); err != nil {
return "", err
}
return root, nil
}

12
daemon/execdriver/lxc/lxc_template.go
View file

@ -34,10 +34,6 @@ lxc.pts = 1024
# disable the main console
lxc.console = none
{{if .ProcessLabel}}
lxc.se_context = {{ .ProcessLabel}}
{{end}}
{{$MOUNTLABEL := .MountLabel}}
# no controlling tty at all
lxc.tty = 1
@ -70,8 +66,8 @@ lxc.mount.entry = sysfs {{escapeFstabSpaces $ROOTFS}}/sys sysfs nosuid,nodev,noe
lxc.mount.entry = {{.ProcessConfig.Console}} {{escapeFstabSpaces $ROOTFS}}/dev/console none bind,rw 0 0
{{end}}
lxc.mount.entry = devpts {{escapeFstabSpaces $ROOTFS}}/dev/pts devpts {{formatMountLabel "newinstance,ptmxmode=0666,nosuid,noexec" $MOUNTLABEL}} 0 0
lxc.mount.entry = shm {{escapeFstabSpaces $ROOTFS}}/dev/shm tmpfs {{formatMountLabel "size=65536k,nosuid,nodev,noexec" $MOUNTLABEL}} 0 0
lxc.mount.entry = devpts {{escapeFstabSpaces $ROOTFS}}/dev/pts devpts {{formatMountLabel "newinstance,ptmxmode=0666,nosuid,noexec" ""}} 0 0
lxc.mount.entry = shm {{escapeFstabSpaces $ROOTFS}}/dev/shm tmpfs {{formatMountLabel "size=65536k,nosuid,nodev,noexec" ""}} 0 0
{{range $value := .Mounts}}
{{if $value.Writable}}
@ -106,8 +102,8 @@ lxc.cgroup.cpuset.cpus = {{.Resources.Cpuset}}
{{end}}
{{end}}
{{if .Config.lxc}}
{{range $value := .Config.lxc}}
{{if .LxcConfig}}
{{range $value := .LxcConfig}}
lxc.{{$value}}
{{end}}
{{end}}

8
daemon/execdriver/lxc/lxc_template_unit_test.go
View file

@ -83,11 +83,9 @@ func TestCustomLxcConfig(t *testing.T) {
}
command := &execdriver.Command{
ID: "1",
Config: map[string][]string{
"lxc": {
"lxc.utsname = docker",
"lxc.cgroup.cpuset.cpus = 0,1",
},
LxcConfig: []string{
"lxc.utsname = docker",
"lxc.cgroup.cpuset.cpus = 0,1",
},
Network: &execdriver.Network{
Mtu: 1500,

188
daemon/execdriver/native/configuration/parse.go
View file

@ -1,188 +0,0 @@
package configuration
import (
"fmt"
"os/exec"
"path/filepath"
"strconv"
"strings"
"github.com/docker/docker/pkg/units"
"github.com/docker/libcontainer"
)
type Action func(*libcontainer.Config, interface{}, string) error
var actions = map[string]Action{
"cap.add": addCap, // add a cap
"cap.drop": dropCap, // drop a cap
"ns.add": addNamespace, // add a namespace
"ns.drop": dropNamespace, // drop a namespace when cloning
"net.join": joinNetNamespace, // join another containers net namespace
"cgroups.cpu_shares": cpuShares, // set the cpu shares
"cgroups.memory": memory, // set the memory limit
"cgroups.memory_reservation": memoryReservation, // set the memory reservation
"cgroups.memory_swap": memorySwap, // set the memory swap limit
"cgroups.cpuset.cpus": cpusetCpus, // set the cpus used
"systemd.slice": systemdSlice, // set parent Slice used for systemd unit
"apparmor_profile": apparmorProfile, // set the apparmor profile to apply
"fs.readonly": readonlyFs, // make the rootfs of the container read only
}
func cpusetCpus(container *libcontainer.Config, context interface{}, value string) error {
if container.Cgroups == nil {
return fmt.Errorf("cannot set cgroups when they are disabled")
}
container.Cgroups.CpusetCpus = value
return nil
}
func systemdSlice(container *libcontainer.Config, context interface{}, value string) error {
if container.Cgroups == nil {
return fmt.Errorf("cannot set slice when cgroups are disabled")
}
container.Cgroups.Slice = value
return nil
}
func apparmorProfile(container *libcontainer.Config, context interface{}, value string) error {
container.AppArmorProfile = value
return nil
}
func cpuShares(container *libcontainer.Config, context interface{}, value string) error {
if container.Cgroups == nil {
return fmt.Errorf("cannot set cgroups when they are disabled")
}
v, err := strconv.ParseInt(value, 10, 0)
if err != nil {
return err
}
container.Cgroups.CpuShares = v
return nil
}
func memory(container *libcontainer.Config, context interface{}, value string) error {
if container.Cgroups == nil {
return fmt.Errorf("cannot set cgroups when they are disabled")
}
v, err := units.RAMInBytes(value)
if err != nil {
return err
}
container.Cgroups.Memory = v
return nil
}
func memoryReservation(container *libcontainer.Config, context interface{}, value string) error {
if container.Cgroups == nil {
return fmt.Errorf("cannot set cgroups when they are disabled")
}
v, err := units.RAMInBytes(value)
if err != nil {
return err
}
container.Cgroups.MemoryReservation = v
return nil
}
func memorySwap(container *libcontainer.Config, context interface{}, value string) error {
if container.Cgroups == nil {
return fmt.Errorf("cannot set cgroups when they are disabled")
}
v, err := strconv.ParseInt(value, 0, 64)
if err != nil {
return err
}
container.Cgroups.MemorySwap = v
return nil
}
func addCap(container *libcontainer.Config, context interface{}, value string) error {
container.Capabilities = append(container.Capabilities, value)
return nil
}
func dropCap(container *libcontainer.Config, context interface{}, value string) error {
// If the capability is specified multiple times, remove all instances.
for i, capability := range container.Capabilities {
if capability == value {
container.Capabilities = append(container.Capabilities[:i], container.Capabilities[i+1:]...)
}
}
// The capability wasn't found so we will drop it anyways.
return nil
}
func addNamespace(container *libcontainer.Config, context interface{}, value string) error {
container.Namespaces[value] = true
return nil
}
func dropNamespace(container *libcontainer.Config, context interface{}, value string) error {
container.Namespaces[value] = false
return nil
}
func readonlyFs(container *libcontainer.Config, context interface{}, value string) error {
switch value {
case "1", "true":
container.MountConfig.ReadonlyFs = true
default:
container.MountConfig.ReadonlyFs = false
}
return nil
}
func joinNetNamespace(container *libcontainer.Config, context interface{}, value string) error {
var (
running = context.(map[string]*exec.Cmd)
cmd = running[value]
)
if cmd == nil || cmd.Process == nil {
return fmt.Errorf("%s is not a valid running container to join", value)
}
nspath := filepath.Join("/proc", fmt.Sprint(cmd.Process.Pid), "ns", "net")
container.Networks = append(container.Networks, &libcontainer.Network{
Type: "netns",
NsPath: nspath,
})
return nil
}
// configureCustomOptions takes string commands from the user and allows modification of the
// container's default configuration.
//
// TODO: this can be moved to a general utils or parser in pkg
func ParseConfiguration(container *libcontainer.Config, running map[string]*exec.Cmd, opts []string) error {
for _, opt := range opts {
kv := strings.SplitN(opt, "=", 2)
if len(kv) < 2 {
return fmt.Errorf("invalid format for %s", opt)
}
action, exists := actions[kv[0]]
if !exists {
return fmt.Errorf("%s is not a valid option for the native driver", kv[0])
}
if err := action(container, running, kv[1]); err != nil {
return err
}
}
return nil
}

193
daemon/execdriver/native/configuration/parse_test.go
View file

@ -1,193 +0,0 @@
package configuration
import (
"testing"
"github.com/docker/docker/daemon/execdriver/native/template"
"github.com/docker/libcontainer/security/capabilities"
)
// Checks whether the expected capability is specified in the capabilities.
func hasCapability(expected string, capabilities []string) bool {
for _, capability := range capabilities {
if capability == expected {
return true
}
}
return false
}
func TestSetReadonlyRootFs(t *testing.T) {
var (
container = template.New()
opts = []string{
"fs.readonly=true",
}
)
if container.MountConfig.ReadonlyFs {
t.Fatal("container should not have a readonly rootfs by default")
}
if err := ParseConfiguration(container, nil, opts); err != nil {
t.Fatal(err)
}
if !container.MountConfig.ReadonlyFs {
t.Fatal("container should have a readonly rootfs")
}
}
func TestConfigurationsDoNotConflict(t *testing.T) {
var (
container1 = template.New()
container2 = template.New()
opts = []string{
"cap.add=NET_ADMIN",
}
)
if err := ParseConfiguration(container1, nil, opts); err != nil {
t.Fatal(err)
}
if !hasCapability("NET_ADMIN", container1.Capabilities) {
t.Fatal("container one should have NET_ADMIN enabled")
}
if hasCapability("NET_ADMIN", container2.Capabilities) {
t.Fatal("container two should not have NET_ADMIN enabled")
}
}
func TestCpusetCpus(t *testing.T) {
var (
container = template.New()
opts = []string{
"cgroups.cpuset.cpus=1,2",
}
)
if err := ParseConfiguration(container, nil, opts); err != nil {
t.Fatal(err)
}
if expected := "1,2"; container.Cgroups.CpusetCpus != expected {
t.Fatalf("expected %s got %s for cpuset.cpus", expected, container.Cgroups.CpusetCpus)
}
}
func TestAppArmorProfile(t *testing.T) {
var (
container = template.New()
opts = []string{
"apparmor_profile=koye-the-protector",
}
)
if err := ParseConfiguration(container, nil, opts); err != nil {
t.Fatal(err)
}
if expected := "koye-the-protector"; container.AppArmorProfile != expected {
t.Fatalf("expected profile %s got %s", expected, container.AppArmorProfile)
}
}
func TestCpuShares(t *testing.T) {
var (
container = template.New()
opts = []string{
"cgroups.cpu_shares=1048",
}
)
if err := ParseConfiguration(container, nil, opts); err != nil {
t.Fatal(err)
}
if expected := int64(1048); container.Cgroups.CpuShares != expected {
t.Fatalf("expected cpu shares %d got %d", expected, container.Cgroups.CpuShares)
}
}
func TestMemory(t *testing.T) {
var (
container = template.New()
opts = []string{
"cgroups.memory=500m",
}
)
if err := ParseConfiguration(container, nil, opts); err != nil {
t.Fatal(err)
}
if expected := int64(500 * 1024 * 1024); container.Cgroups.Memory != expected {
t.Fatalf("expected memory %d got %d", expected, container.Cgroups.Memory)
}
}
func TestMemoryReservation(t *testing.T) {
var (
container = template.New()
opts = []string{
"cgroups.memory_reservation=500m",
}
)
if err := ParseConfiguration(container, nil, opts); err != nil {
t.Fatal(err)
}
if expected := int64(500 * 1024 * 1024); container.Cgroups.MemoryReservation != expected {
t.Fatalf("expected memory reservation %d got %d", expected, container.Cgroups.MemoryReservation)
}
}
func TestAddCap(t *testing.T) {
var (
container = template.New()
opts = []string{
"cap.add=MKNOD",
"cap.add=SYS_ADMIN",
}
)
if err := ParseConfiguration(container, nil, opts); err != nil {
t.Fatal(err)
}
if !hasCapability("MKNOD", container.Capabilities) {
t.Fatal("container should have MKNOD enabled")
}
if !hasCapability("SYS_ADMIN", container.Capabilities) {
t.Fatal("container should have SYS_ADMIN enabled")
}
}
func TestDropCap(t *testing.T) {
var (
container = template.New()
opts = []string{
"cap.drop=MKNOD",
}
)
// enabled all caps like in privileged mode
container.Capabilities = capabilities.GetAllCapabilities()
if err := ParseConfiguration(container, nil, opts); err != nil {
t.Fatal(err)
}
if hasCapability("MKNOD", container.Capabilities) {
t.Fatal("container should not have MKNOD enabled")
}
}
func TestDropNamespace(t *testing.T) {
var (
container = template.New()
opts = []string{
"ns.drop=NEWNET",
}
)
if err := ParseConfiguration(container, nil, opts); err != nil {
t.Fatal(err)
}
if container.Namespaces["NEWNET"] {
t.Fatal("container should not have NEWNET enabled")
}
}

9
daemon/execdriver/native/create.go
View file

@ -9,7 +9,6 @@ import (
"path/filepath"
"github.com/docker/docker/daemon/execdriver"
"github.com/docker/docker/daemon/execdriver/native/configuration"
"github.com/docker/docker/daemon/execdriver/native/template"
"github.com/docker/libcontainer"
"github.com/docker/libcontainer/apparmor"
@ -69,10 +68,6 @@ func (d *driver) createContainer(c *execdriver.Command) (*libcontainer.Config, e
}
d.Unlock()
if err := configuration.ParseConfiguration(container, cmds, c.Config["native"]); err != nil {
return nil, err
}
return container, nil
}
@ -175,8 +170,8 @@ func (d *driver) setupMounts(container *libcontainer.Config, c *execdriver.Comma
}
func (d *driver) setupLabels(container *libcontainer.Config, c *execdriver.Command) error {
container.ProcessLabel = c.Config["process_label"][0]
container.MountConfig.MountLabel = c.Config["mount_label"][0]
container.ProcessLabel = c.ProcessLabel
container.MountConfig.MountLabel = c.MountLabel
return nil
}

12
daemon/utils.go
View file

@ -32,20 +32,22 @@ func migratePortMappings(config *runconfig.Config, hostConfig *runconfig.HostCon
return nil
}
func mergeLxcConfIntoOptions(hostConfig *runconfig.HostConfig, driverConfig map[string][]string) {
func mergeLxcConfIntoOptions(hostConfig *runconfig.HostConfig) []string {
if hostConfig == nil {
return
return nil
}
out := []string{}
// merge in the lxc conf options into the generic config map
if lxcConf := hostConfig.LxcConf; lxcConf != nil {
lxc := driverConfig["lxc"]
for _, pair := range lxcConf {
// because lxc conf gets the driver name lxc.XXXX we need to trim it off
// and let the lxc driver add it back later if needed
parts := strings.SplitN(pair.Key, ".", 2)
lxc = append(lxc, fmt.Sprintf("%s=%s", parts[1], pair.Value))
out = append(out, fmt.Sprintf("%s=%s", parts[1], pair.Value))
}
driverConfig["lxc"] = lxc
}
return out
}

20
daemon/utils_test.go
View file

@ -8,21 +8,15 @@ import (
)
func TestMergeLxcConfig(t *testing.T) {
var (
hostConfig = &runconfig.HostConfig{
LxcConf: []utils.KeyValuePair{
{Key: "lxc.cgroups.cpuset", Value: "1,2"},
},
}
driverConfig = make(map[string][]string)
)
mergeLxcConfIntoOptions(hostConfig, driverConfig)
if l := len(driverConfig["lxc"]); l > 1 {
t.Fatalf("expected lxc options len of 1 got %d", l)
hostConfig := &runconfig.HostConfig{
LxcConf: []utils.KeyValuePair{
{Key: "lxc.cgroups.cpuset", Value: "1,2"},
},
}
cpuset := driverConfig["lxc"][0]
out := mergeLxcConfIntoOptions(hostConfig)
cpuset := out[0]
if expected := "cgroups.cpuset=1,2"; cpuset != expected {
t.Fatalf("expected %s got %s", expected, cpuset)
}