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package abi
import (
"context"
"fmt"
"strings"
"github.com/containers/libpod/libpod"
"github.com/containers/libpod/pkg/domain/entities"
"github.com/containers/libpod/pkg/systemd/generate"
"github.com/pkg/errors"
)
func (ic *ContainerEngine) GenerateSystemd(ctx context.Context, nameOrID string, options entities.GenerateSystemdOptions) (*entities.GenerateSystemdReport, error) {
opts := generate.Options{
Files: options.Files,
New: options.New,
}
// First assume it's a container.
if info, found, err := ic.generateSystemdgenContainerInfo(nameOrID, nil, options); found && err != nil {
return nil, err
} else if found && err == nil {
output, err := generate.CreateContainerSystemdUnit(info, opts)
if err != nil {
return nil, err
}
return &entities.GenerateSystemdReport{Output: output}, nil
}
// --new does not support pods.
if options.New {
return nil, errors.Errorf("error generating systemd unit files: cannot generate generic files for a pod")
}
// We're either having a pod or garbage.
pod, err := ic.Libpod.LookupPod(nameOrID)
if err != nil {
return nil, err
}
// Error out if the pod has no infra container, which we require to be the
// main service.
if !pod.HasInfraContainer() {
return nil, fmt.Errorf("error generating systemd unit files: Pod %q has no infra container", pod.Name())
}
// Generate a systemdgen.ContainerInfo for the infra container. This
// ContainerInfo acts as the main service of the pod.
infraID, err := pod.InfraContainerID()
if err != nil {
return nil, nil
}
podInfo, _, err := ic.generateSystemdgenContainerInfo(infraID, pod, options)
if err != nil {
return nil, err
}
// Compute the container-dependency graph for the Pod.
containers, err := pod.AllContainers()
if err != nil {
return nil, err
}
if len(containers) == 0 {
return nil, fmt.Errorf("error generating systemd unit files: Pod %q has no containers", pod.Name())
}
graph, err := libpod.BuildContainerGraph(containers)
if err != nil {
return nil, err
}
// Traverse the dependency graph and create systemdgen.ContainerInfo's for
// each container.
containerInfos := []*generate.ContainerInfo{podInfo}
for ctr, dependencies := range graph.DependencyMap() {
// Skip the infra container as we already generated it.
if ctr.ID() == infraID {
continue
}
ctrInfo, _, err := ic.generateSystemdgenContainerInfo(ctr.ID(), nil, options)
if err != nil {
return nil, err
}
// Now add the container's dependencies and at the container as a
// required service of the infra container.
for _, dep := range dependencies {
if dep.ID() == infraID {
ctrInfo.BoundToServices = append(ctrInfo.BoundToServices, podInfo.ServiceName)
} else {
_, serviceName := generateServiceName(dep, nil, options)
ctrInfo.BoundToServices = append(ctrInfo.BoundToServices, serviceName)
}
}
podInfo.RequiredServices = append(podInfo.RequiredServices, ctrInfo.ServiceName)
containerInfos = append(containerInfos, ctrInfo)
}
// Now generate the systemd service for all containers.
builder := strings.Builder{}
for i, info := range containerInfos {
if i > 0 {
builder.WriteByte('\n')
}
out, err := generate.CreateContainerSystemdUnit(info, opts)
if err != nil {
return nil, err
}
builder.WriteString(out)
}
return &entities.GenerateSystemdReport{Output: builder.String()}, nil
}
// generateSystemdgenContainerInfo is a helper to generate a
// systemdgen.ContainerInfo for `GenerateSystemd`.
func (ic *ContainerEngine) generateSystemdgenContainerInfo(nameOrID string, pod *libpod.Pod, options entities.GenerateSystemdOptions) (*generate.ContainerInfo, bool, error) {
ctr, err := ic.Libpod.LookupContainer(nameOrID)
if err != nil {
return nil, false, err
}
timeout := ctr.StopTimeout()
if options.StopTimeout != nil {
timeout = *options.StopTimeout
}
config := ctr.Config()
conmonPidFile := config.ConmonPidFile
if conmonPidFile == "" {
return nil, true, errors.Errorf("conmon PID file path is empty, try to recreate the container with --conmon-pidfile flag")
}
createCommand := []string{}
if config.CreateCommand != nil {
createCommand = config.CreateCommand
} else if options.New {
return nil, true, errors.Errorf("cannot use --new on container %q: no create command found", nameOrID)
}
name, serviceName := generateServiceName(ctr, pod, options)
info := &generate.ContainerInfo{
ServiceName: serviceName,
ContainerName: name,
RestartPolicy: options.RestartPolicy,
PIDFile: conmonPidFile,
StopTimeout: timeout,
GenerateTimestamp: true,
CreateCommand: createCommand,
}
return info, true, nil
}
// generateServiceName generates the container name and the service name for systemd service.
func generateServiceName(ctr *libpod.Container, pod *libpod.Pod, options entities.GenerateSystemdOptions) (string, string) {
var kind, name, ctrName string
if pod == nil {
kind = "container"
name = ctr.ID()
if options.Name {
name = ctr.Name()
}
ctrName = name
} else {
kind = "pod"
name = pod.ID()
ctrName = ctr.ID()
if options.Name {
name = pod.Name()
ctrName = ctr.Name()
}
}
return ctrName, fmt.Sprintf("%s-%s", kind, name)
}
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