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633 lines
20 KiB
Go
633 lines
20 KiB
Go
package libcontainerd
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import (
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"path/filepath"
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"strings"
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"syscall"
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"golang.org/x/net/context"
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"github.com/Microsoft/hcsshim"
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"github.com/Sirupsen/logrus"
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"github.com/docker/docker/pkg/sysinfo"
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specs "github.com/opencontainers/runtime-spec/specs-go"
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)
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type client struct {
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clientCommon
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// Platform specific properties below here (none presently on Windows)
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}
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// Win32 error codes that are used for various workarounds
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// These really should be ALL_CAPS to match golangs syscall library and standard
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// Win32 error conventions, but golint insists on CamelCase.
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const (
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CoEClassstring = syscall.Errno(0x800401F3) // Invalid class string
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ErrorNoNetwork = syscall.Errno(1222) // The network is not present or not started
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ErrorBadPathname = syscall.Errno(161) // The specified path is invalid
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ErrorInvalidObject = syscall.Errno(0x800710D8) // The object identifier does not represent a valid object
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)
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// defaultOwner is a tag passed to HCS to allow it to differentiate between
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// container creator management stacks. We hard code "docker" in the case
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// of docker.
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const defaultOwner = "docker"
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// Create is the entrypoint to create a container from a spec, and if successfully
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// created, start it too. Table below shows the fields required for HCS JSON calling parameters,
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// where if not populated, is omitted.
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// +-----------------+--------------------------------------------+---------------------------------------------------+
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// | | Isolation=Process | Isolation=Hyper-V |
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// +-----------------+--------------------------------------------+---------------------------------------------------+
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// | VolumePath | \\?\\Volume{GUIDa} | |
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// | LayerFolderPath | %root%\windowsfilter\containerID | %root%\windowsfilter\containerID (servicing only) |
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// | Layers[] | ID=GUIDb;Path=%root%\windowsfilter\layerID | ID=GUIDb;Path=%root%\windowsfilter\layerID |
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// | SandboxPath | | %root%\windowsfilter |
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// | HvRuntime | | ImagePath=%root%\BaseLayerID\UtilityVM |
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// +-----------------+--------------------------------------------+---------------------------------------------------+
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//
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// Isolation=Process example:
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//
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// {
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// "SystemType": "Container",
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// "Name": "5e0055c814a6005b8e57ac59f9a522066e0af12b48b3c26a9416e23907698776",
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// "Owner": "docker",
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// "IsDummy": false,
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// "VolumePath": "\\\\\\\\?\\\\Volume{66d1ef4c-7a00-11e6-8948-00155ddbef9d}",
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// "IgnoreFlushesDuringBoot": true,
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// "LayerFolderPath": "C:\\\\control\\\\windowsfilter\\\\5e0055c814a6005b8e57ac59f9a522066e0af12b48b3c26a9416e23907698776",
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// "Layers": [{
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// "ID": "18955d65-d45a-557b-bf1c-49d6dfefc526",
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// "Path": "C:\\\\control\\\\windowsfilter\\\\65bf96e5760a09edf1790cb229e2dfb2dbd0fcdc0bf7451bae099106bfbfea0c"
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// }],
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// "HostName": "5e0055c814a6",
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// "MappedDirectories": [],
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// "HvPartition": false,
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// "EndpointList": ["eef2649d-bb17-4d53-9937-295a8efe6f2c"],
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// "Servicing": false
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//}
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//
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// Isolation=Hyper-V example:
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//
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//{
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// "SystemType": "Container",
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// "Name": "475c2c58933b72687a88a441e7e0ca4bd72d76413c5f9d5031fee83b98f6045d",
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// "Owner": "docker",
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// "IsDummy": false,
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// "IgnoreFlushesDuringBoot": true,
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// "Layers": [{
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// "ID": "18955d65-d45a-557b-bf1c-49d6dfefc526",
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// "Path": "C:\\\\control\\\\windowsfilter\\\\65bf96e5760a09edf1790cb229e2dfb2dbd0fcdc0bf7451bae099106bfbfea0c"
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// }],
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// "HostName": "475c2c58933b",
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// "MappedDirectories": [],
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// "SandboxPath": "C:\\\\control\\\\windowsfilter",
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// "HvPartition": true,
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// "EndpointList": ["e1bb1e61-d56f-405e-b75d-fd520cefa0cb"],
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// "HvRuntime": {
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// "ImagePath": "C:\\\\control\\\\windowsfilter\\\\65bf96e5760a09edf1790cb229e2dfb2dbd0fcdc0bf7451bae099106bfbfea0c\\\\UtilityVM"
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// },
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// "Servicing": false
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//}
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func (clnt *client) Create(containerID string, checkpoint string, checkpointDir string, spec specs.Spec, attachStdio StdioCallback, options ...CreateOption) error {
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clnt.lock(containerID)
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defer clnt.unlock(containerID)
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logrus.Debugln("libcontainerd: client.Create() with spec", spec)
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configuration := &hcsshim.ContainerConfig{
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SystemType: "Container",
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Name: containerID,
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Owner: defaultOwner,
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IgnoreFlushesDuringBoot: false,
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HostName: spec.Hostname,
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HvPartition: false,
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}
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if spec.Windows.Resources != nil {
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if spec.Windows.Resources.CPU != nil {
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if spec.Windows.Resources.CPU.Count != nil {
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// This check is being done here rather than in adaptContainerSettings
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// because we don't want to update the HostConfig in case this container
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// is moved to a host with more CPUs than this one.
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cpuCount := *spec.Windows.Resources.CPU.Count
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hostCPUCount := uint64(sysinfo.NumCPU())
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if cpuCount > hostCPUCount {
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logrus.Warnf("Changing requested CPUCount of %d to current number of processors, %d", cpuCount, hostCPUCount)
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cpuCount = hostCPUCount
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}
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configuration.ProcessorCount = uint32(cpuCount)
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}
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if spec.Windows.Resources.CPU.Shares != nil {
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configuration.ProcessorWeight = uint64(*spec.Windows.Resources.CPU.Shares)
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}
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if spec.Windows.Resources.CPU.Percent != nil {
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configuration.ProcessorMaximum = int64(*spec.Windows.Resources.CPU.Percent) * 100 // ProcessorMaximum is a value between 1 and 10000
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}
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}
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if spec.Windows.Resources.Memory != nil {
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if spec.Windows.Resources.Memory.Limit != nil {
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configuration.MemoryMaximumInMB = int64(*spec.Windows.Resources.Memory.Limit) / 1024 / 1024
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}
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}
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if spec.Windows.Resources.Storage != nil {
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if spec.Windows.Resources.Storage.Bps != nil {
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configuration.StorageBandwidthMaximum = *spec.Windows.Resources.Storage.Bps
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}
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if spec.Windows.Resources.Storage.Iops != nil {
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configuration.StorageIOPSMaximum = *spec.Windows.Resources.Storage.Iops
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}
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}
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}
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var layerOpt *LayerOption
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for _, option := range options {
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if s, ok := option.(*ServicingOption); ok {
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configuration.Servicing = s.IsServicing
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continue
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}
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if f, ok := option.(*FlushOption); ok {
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configuration.IgnoreFlushesDuringBoot = f.IgnoreFlushesDuringBoot
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continue
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}
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if h, ok := option.(*HyperVIsolationOption); ok {
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configuration.HvPartition = h.IsHyperV
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configuration.SandboxPath = h.SandboxPath
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continue
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}
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if l, ok := option.(*LayerOption); ok {
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layerOpt = l
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}
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if n, ok := option.(*NetworkEndpointsOption); ok {
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configuration.EndpointList = n.Endpoints
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configuration.AllowUnqualifiedDNSQuery = n.AllowUnqualifiedDNSQuery
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continue
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}
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if c, ok := option.(*CredentialsOption); ok {
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configuration.Credentials = c.Credentials
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continue
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}
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}
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// We must have a layer option with at least one path
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if layerOpt == nil || layerOpt.LayerPaths == nil {
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return fmt.Errorf("no layer option or paths were supplied to the runtime")
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}
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if configuration.HvPartition {
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// Find the upper-most utility VM image, since the utility VM does not
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// use layering in RS1.
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// TODO @swernli/jhowardmsft at some point post RS1 this may be re-locatable.
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var uvmImagePath string
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for _, path := range layerOpt.LayerPaths {
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fullPath := filepath.Join(path, "UtilityVM")
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_, err := os.Stat(fullPath)
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if err == nil {
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uvmImagePath = fullPath
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break
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}
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if !os.IsNotExist(err) {
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return err
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}
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}
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if uvmImagePath == "" {
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return errors.New("utility VM image could not be found")
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}
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configuration.HvRuntime = &hcsshim.HvRuntime{ImagePath: uvmImagePath}
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} else {
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configuration.VolumePath = spec.Root.Path
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}
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configuration.LayerFolderPath = layerOpt.LayerFolderPath
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for _, layerPath := range layerOpt.LayerPaths {
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_, filename := filepath.Split(layerPath)
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g, err := hcsshim.NameToGuid(filename)
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if err != nil {
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return err
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}
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configuration.Layers = append(configuration.Layers, hcsshim.Layer{
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ID: g.ToString(),
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Path: layerPath,
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})
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}
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// Add the mounts (volumes, bind mounts etc) to the structure
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mds := make([]hcsshim.MappedDir, len(spec.Mounts))
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for i, mount := range spec.Mounts {
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mds[i] = hcsshim.MappedDir{
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HostPath: mount.Source,
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ContainerPath: mount.Destination,
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ReadOnly: false,
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}
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for _, o := range mount.Options {
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if strings.ToLower(o) == "ro" {
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mds[i].ReadOnly = true
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}
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}
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}
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configuration.MappedDirectories = mds
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hcsContainer, err := hcsshim.CreateContainer(containerID, configuration)
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if err != nil {
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return err
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}
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// Construct a container object for calling start on it.
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container := &container{
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containerCommon: containerCommon{
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process: process{
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processCommon: processCommon{
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containerID: containerID,
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client: clnt,
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friendlyName: InitFriendlyName,
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},
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commandLine: strings.Join(spec.Process.Args, " "),
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},
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processes: make(map[string]*process),
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},
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ociSpec: spec,
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hcsContainer: hcsContainer,
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}
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container.options = options
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for _, option := range options {
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if err := option.Apply(container); err != nil {
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logrus.Errorf("libcontainerd: %v", err)
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}
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}
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// Call start, and if it fails, delete the container from our
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// internal structure, start will keep HCS in sync by deleting the
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// container there.
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logrus.Debugf("libcontainerd: Create() id=%s, Calling start()", containerID)
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if err := container.start(attachStdio); err != nil {
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clnt.deleteContainer(containerID)
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return err
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}
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logrus.Debugf("libcontainerd: Create() id=%s completed successfully", containerID)
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return nil
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}
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// AddProcess is the handler for adding a process to an already running
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// container. It's called through docker exec. It returns the system pid of the
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// exec'd process.
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func (clnt *client) AddProcess(ctx context.Context, containerID, processFriendlyName string, procToAdd Process, attachStdio StdioCallback) (int, error) {
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clnt.lock(containerID)
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defer clnt.unlock(containerID)
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container, err := clnt.getContainer(containerID)
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if err != nil {
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return -1, err
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}
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// Note we always tell HCS to
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// create stdout as it's required regardless of '-i' or '-t' options, so that
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// docker can always grab the output through logs. We also tell HCS to always
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// create stdin, even if it's not used - it will be closed shortly. Stderr
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// is only created if it we're not -t.
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createProcessParms := hcsshim.ProcessConfig{
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EmulateConsole: procToAdd.Terminal,
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CreateStdInPipe: true,
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CreateStdOutPipe: true,
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CreateStdErrPipe: !procToAdd.Terminal,
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}
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createProcessParms.ConsoleSize[0] = uint(procToAdd.ConsoleSize.Height)
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createProcessParms.ConsoleSize[1] = uint(procToAdd.ConsoleSize.Width)
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// Take working directory from the process to add if it is defined,
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// otherwise take from the first process.
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if procToAdd.Cwd != "" {
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createProcessParms.WorkingDirectory = procToAdd.Cwd
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} else {
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createProcessParms.WorkingDirectory = container.ociSpec.Process.Cwd
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}
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// Configure the environment for the process
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createProcessParms.Environment = setupEnvironmentVariables(procToAdd.Env)
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createProcessParms.CommandLine = strings.Join(procToAdd.Args, " ")
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createProcessParms.User = procToAdd.User.Username
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logrus.Debugf("libcontainerd: commandLine: %s", createProcessParms.CommandLine)
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// Start the command running in the container.
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var stdout, stderr io.ReadCloser
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var stdin io.WriteCloser
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newProcess, err := container.hcsContainer.CreateProcess(&createProcessParms)
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if err != nil {
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logrus.Errorf("libcontainerd: AddProcess(%s) CreateProcess() failed %s", containerID, err)
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return -1, err
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}
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pid := newProcess.Pid()
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stdin, stdout, stderr, err = newProcess.Stdio()
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if err != nil {
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logrus.Errorf("libcontainerd: %s getting std pipes failed %s", containerID, err)
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return -1, err
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}
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iopipe := &IOPipe{Terminal: procToAdd.Terminal}
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iopipe.Stdin = createStdInCloser(stdin, newProcess)
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// Convert io.ReadClosers to io.Readers
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if stdout != nil {
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iopipe.Stdout = ioutil.NopCloser(&autoClosingReader{ReadCloser: stdout})
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}
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if stderr != nil {
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iopipe.Stderr = ioutil.NopCloser(&autoClosingReader{ReadCloser: stderr})
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}
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proc := &process{
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processCommon: processCommon{
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containerID: containerID,
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friendlyName: processFriendlyName,
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client: clnt,
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systemPid: uint32(pid),
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},
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commandLine: createProcessParms.CommandLine,
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hcsProcess: newProcess,
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}
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// Add the process to the container's list of processes
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container.processes[processFriendlyName] = proc
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// Tell the engine to attach streams back to the client
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if err := attachStdio(*iopipe); err != nil {
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return -1, err
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}
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// Spin up a go routine waiting for exit to handle cleanup
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go container.waitExit(proc, false)
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return pid, nil
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}
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// Signal handles `docker stop` on Windows. While Linux has support for
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// the full range of signals, signals aren't really implemented on Windows.
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// We fake supporting regular stop and -9 to force kill.
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func (clnt *client) Signal(containerID string, sig int) error {
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var (
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cont *container
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err error
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)
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// Get the container as we need it to get the container handle.
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clnt.lock(containerID)
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defer clnt.unlock(containerID)
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if cont, err = clnt.getContainer(containerID); err != nil {
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return err
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}
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cont.manualStopRequested = true
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logrus.Debugf("libcontainerd: Signal() containerID=%s sig=%d pid=%d", containerID, sig, cont.systemPid)
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if syscall.Signal(sig) == syscall.SIGKILL {
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// Terminate the compute system
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if err := cont.hcsContainer.Terminate(); err != nil {
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if !hcsshim.IsPending(err) {
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logrus.Errorf("libcontainerd: failed to terminate %s - %q", containerID, err)
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}
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}
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} else {
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// Shut down the container
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if err := cont.hcsContainer.Shutdown(); err != nil {
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if !hcsshim.IsPending(err) && !hcsshim.IsAlreadyStopped(err) {
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// ignore errors
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logrus.Warnf("libcontainerd: failed to shutdown container %s: %q", containerID, err)
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}
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}
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}
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return nil
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}
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// While Linux has support for the full range of signals, signals aren't really implemented on Windows.
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// We try to terminate the specified process whatever signal is requested.
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func (clnt *client) SignalProcess(containerID string, processFriendlyName string, sig int) error {
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clnt.lock(containerID)
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defer clnt.unlock(containerID)
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cont, err := clnt.getContainer(containerID)
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if err != nil {
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return err
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}
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for _, p := range cont.processes {
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if p.friendlyName == processFriendlyName {
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return p.hcsProcess.Kill()
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}
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}
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return fmt.Errorf("SignalProcess could not find process %s in %s", processFriendlyName, containerID)
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}
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// Resize handles a CLI event to resize an interactive docker run or docker exec
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// window.
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func (clnt *client) Resize(containerID, processFriendlyName string, width, height int) error {
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// Get the libcontainerd container object
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clnt.lock(containerID)
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defer clnt.unlock(containerID)
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cont, err := clnt.getContainer(containerID)
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if err != nil {
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return err
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}
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h, w := uint16(height), uint16(width)
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if processFriendlyName == InitFriendlyName {
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logrus.Debugln("libcontainerd: resizing systemPID in", containerID, cont.process.systemPid)
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return cont.process.hcsProcess.ResizeConsole(w, h)
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}
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for _, p := range cont.processes {
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if p.friendlyName == processFriendlyName {
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logrus.Debugln("libcontainerd: resizing exec'd process", containerID, p.systemPid)
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return p.hcsProcess.ResizeConsole(w, h)
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}
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}
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return fmt.Errorf("Resize could not find containerID %s to resize", containerID)
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}
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// Pause handles pause requests for containers
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func (clnt *client) Pause(containerID string) error {
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unlockContainer := true
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// Get the libcontainerd container object
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clnt.lock(containerID)
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defer func() {
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if unlockContainer {
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clnt.unlock(containerID)
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}
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}()
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container, err := clnt.getContainer(containerID)
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if err != nil {
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return err
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}
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for _, option := range container.options {
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if h, ok := option.(*HyperVIsolationOption); ok {
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if !h.IsHyperV {
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return errors.New("cannot pause Windows Server Containers")
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}
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break
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}
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}
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err = container.hcsContainer.Pause()
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if err != nil {
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return err
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}
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// Unlock container before calling back into the daemon
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unlockContainer = false
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clnt.unlock(containerID)
|
|
|
|
return clnt.backend.StateChanged(containerID, StateInfo{
|
|
CommonStateInfo: CommonStateInfo{
|
|
State: StatePause,
|
|
}})
|
|
}
|
|
|
|
// Resume handles resume requests for containers
|
|
func (clnt *client) Resume(containerID string) error {
|
|
unlockContainer := true
|
|
// Get the libcontainerd container object
|
|
clnt.lock(containerID)
|
|
defer func() {
|
|
if unlockContainer {
|
|
clnt.unlock(containerID)
|
|
}
|
|
}()
|
|
container, err := clnt.getContainer(containerID)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// This should never happen, since Windows Server Containers cannot be paused
|
|
for _, option := range container.options {
|
|
if h, ok := option.(*HyperVIsolationOption); ok {
|
|
if !h.IsHyperV {
|
|
return errors.New("cannot resume Windows Server Containers")
|
|
}
|
|
break
|
|
}
|
|
}
|
|
|
|
err = container.hcsContainer.Resume()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Unlock container before calling back into the daemon
|
|
unlockContainer = false
|
|
clnt.unlock(containerID)
|
|
|
|
return clnt.backend.StateChanged(containerID, StateInfo{
|
|
CommonStateInfo: CommonStateInfo{
|
|
State: StateResume,
|
|
}})
|
|
}
|
|
|
|
// Stats handles stats requests for containers
|
|
func (clnt *client) Stats(containerID string) (*Stats, error) {
|
|
// Get the libcontainerd container object
|
|
clnt.lock(containerID)
|
|
defer clnt.unlock(containerID)
|
|
container, err := clnt.getContainer(containerID)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
s, err := container.hcsContainer.Statistics()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
st := Stats(s)
|
|
return &st, nil
|
|
}
|
|
|
|
// Restore is the handler for restoring a container
|
|
func (clnt *client) Restore(containerID string, _ StdioCallback, unusedOnWindows ...CreateOption) error {
|
|
// TODO Windows: Implement this. For now, just tell the backend the container exited.
|
|
logrus.Debugf("libcontainerd: Restore(%s)", containerID)
|
|
return clnt.backend.StateChanged(containerID, StateInfo{
|
|
CommonStateInfo: CommonStateInfo{
|
|
State: StateExit,
|
|
ExitCode: 1 << 31,
|
|
}})
|
|
}
|
|
|
|
// GetPidsForContainer returns a list of process IDs running in a container.
|
|
// Although implemented, this is not used in Windows.
|
|
func (clnt *client) GetPidsForContainer(containerID string) ([]int, error) {
|
|
var pids []int
|
|
clnt.lock(containerID)
|
|
defer clnt.unlock(containerID)
|
|
cont, err := clnt.getContainer(containerID)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// Add the first process
|
|
pids = append(pids, int(cont.containerCommon.systemPid))
|
|
// And add all the exec'd processes
|
|
for _, p := range cont.processes {
|
|
pids = append(pids, int(p.processCommon.systemPid))
|
|
}
|
|
return pids, nil
|
|
}
|
|
|
|
// Summary returns a summary of the processes running in a container.
|
|
// This is present in Windows to support docker top. In linux, the
|
|
// engine shells out to ps to get process information. On Windows, as
|
|
// the containers could be Hyper-V containers, they would not be
|
|
// visible on the container host. However, libcontainerd does have
|
|
// that information.
|
|
func (clnt *client) Summary(containerID string) ([]Summary, error) {
|
|
|
|
// Get the libcontainerd container object
|
|
clnt.lock(containerID)
|
|
defer clnt.unlock(containerID)
|
|
container, err := clnt.getContainer(containerID)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
p, err := container.hcsContainer.ProcessList()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
pl := make([]Summary, len(p))
|
|
for i := range p {
|
|
pl[i] = Summary(p[i])
|
|
}
|
|
return pl, nil
|
|
}
|
|
|
|
// UpdateResources updates resources for a running container.
|
|
func (clnt *client) UpdateResources(containerID string, resources Resources) error {
|
|
// Updating resource isn't supported on Windows
|
|
// but we should return nil for enabling updating container
|
|
return nil
|
|
}
|
|
|
|
func (clnt *client) CreateCheckpoint(containerID string, checkpointID string, checkpointDir string, exit bool) error {
|
|
return errors.New("Windows: Containers do not support checkpoints")
|
|
}
|
|
|
|
func (clnt *client) DeleteCheckpoint(containerID string, checkpointID string, checkpointDir string) error {
|
|
return errors.New("Windows: Containers do not support checkpoints")
|
|
}
|
|
|
|
func (clnt *client) ListCheckpoints(containerID string, checkpointDir string) (*Checkpoints, error) {
|
|
return nil, errors.New("Windows: Containers do not support checkpoints")
|
|
}
|
|
|
|
func (clnt *client) GetServerVersion(ctx context.Context) (*ServerVersion, error) {
|
|
return &ServerVersion{}, nil
|
|
}
|