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convert.go
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convert.go
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package docker
import (
"fmt"
"strings"
"github.com/docker/docker/runconfig/opts"
"github.com/docker/engine-api/types/container"
"github.com/docker/engine-api/types/network"
"github.com/docker/engine-api/types/strslice"
"github.com/docker/go-connections/nat"
"github.com/docker/go-units"
"github.com/docker/libcompose/project"
"github.com/docker/libcompose/utils"
)
// ConfigWrapper wraps Config, HostConfig and NetworkingConfig for a container.
type ConfigWrapper struct {
Config *container.Config
HostConfig *container.HostConfig
NetworkingConfig *network.NetworkingConfig
}
// Filter filters the specified string slice with the specified function.
func Filter(vs []string, f func(string) bool) []string {
r := make([]string, 0, len(vs))
for _, v := range vs {
if f(v) {
r = append(r, v)
}
}
return r
}
func isBind(s string) bool {
return strings.ContainsRune(s, ':')
}
func isVolume(s string) bool {
return !isBind(s)
}
// ConvertToAPI converts a service configuration to a docker API container configuration.
func ConvertToAPI(s *Service) (*ConfigWrapper, error) {
config, hostConfig, err := Convert(s.serviceConfig, s.context.Context)
if err != nil {
return nil, err
}
result := ConfigWrapper{
Config: config,
HostConfig: hostConfig,
}
return &result, nil
}
func volumes(c *project.ServiceConfig, ctx project.Context) map[string]struct{} {
volumes := make(map[string]struct{}, len(c.Volumes))
for k, v := range c.Volumes {
vol := ctx.ResourceLookup.ResolvePath(v, ctx.ComposeFiles[0])
c.Volumes[k] = vol
if isVolume(vol) {
volumes[vol] = struct{}{}
}
}
return volumes
}
func restartPolicy(c *project.ServiceConfig) (*container.RestartPolicy, error) {
restart, err := opts.ParseRestartPolicy(c.Restart)
if err != nil {
return nil, err
}
return &container.RestartPolicy{Name: restart.Name, MaximumRetryCount: restart.MaximumRetryCount}, nil
}
func ports(c *project.ServiceConfig) (map[nat.Port]struct{}, nat.PortMap, error) {
ports, binding, err := nat.ParsePortSpecs(c.Ports)
if err != nil {
return nil, nil, err
}
exPorts, _, err := nat.ParsePortSpecs(c.Expose)
if err != nil {
return nil, nil, err
}
for k, v := range exPorts {
ports[k] = v
}
exposedPorts := map[nat.Port]struct{}{}
for k, v := range ports {
exposedPorts[nat.Port(k)] = v
}
portBindings := nat.PortMap{}
for k, bv := range binding {
dcbs := make([]nat.PortBinding, len(bv))
for k, v := range bv {
dcbs[k] = nat.PortBinding{HostIP: v.HostIP, HostPort: v.HostPort}
}
portBindings[nat.Port(k)] = dcbs
}
return exposedPorts, portBindings, nil
}
// Convert converts a service configuration to an docker API structures (Config and HostConfig)
func Convert(c *project.ServiceConfig, ctx project.Context) (*container.Config, *container.HostConfig, error) {
restartPolicy, err := restartPolicy(c)
if err != nil {
return nil, nil, err
}
exposedPorts, portBindings, err := ports(c)
if err != nil {
return nil, nil, err
}
deviceMappings, err := parseDevices(c.Devices)
if err != nil {
return nil, nil, err
}
var volumesFrom []string
if c.VolumesFrom != nil {
volumesFrom, err = getVolumesFrom(c.VolumesFrom, ctx.Project.Configs, ctx.ProjectName)
if err != nil {
return nil, nil, err
}
}
config := &container.Config{
Entrypoint: strslice.StrSlice(utils.CopySlice(c.Entrypoint.Slice())),
Hostname: c.Hostname,
Domainname: c.DomainName,
User: c.User,
Env: utils.CopySlice(c.Environment.Slice()),
Cmd: strslice.StrSlice(utils.CopySlice(c.Command.Slice())),
Image: c.Image,
Labels: utils.CopyMap(c.Labels.MapParts()),
ExposedPorts: exposedPorts,
Tty: c.Tty,
OpenStdin: c.StdinOpen,
WorkingDir: c.WorkingDir,
Volumes: volumes(c, ctx),
MacAddress: c.MacAddress,
}
ulimits := []*units.Ulimit{}
if c.Ulimits.Elements != nil {
for _, ulimit := range c.Ulimits.Elements {
ulimits = append(ulimits, &units.Ulimit{
Name: ulimit.Name,
Soft: ulimit.Soft,
Hard: ulimit.Hard,
})
}
}
resources := container.Resources{
CgroupParent: c.CgroupParent,
Memory: c.MemLimit,
MemorySwap: c.MemSwapLimit,
CPUShares: c.CPUShares,
CPUQuota: c.CPUQuota,
CpusetCpus: c.CPUSet,
Ulimits: ulimits,
Devices: deviceMappings,
}
hostConfig := &container.HostConfig{
VolumesFrom: volumesFrom,
CapAdd: strslice.StrSlice(utils.CopySlice(c.CapAdd)),
CapDrop: strslice.StrSlice(utils.CopySlice(c.CapDrop)),
ExtraHosts: utils.CopySlice(c.ExtraHosts),
Privileged: c.Privileged,
Binds: Filter(c.Volumes, isBind),
DNS: utils.CopySlice(c.DNS.Slice()),
DNSSearch: utils.CopySlice(c.DNSSearch.Slice()),
LogConfig: container.LogConfig{
Type: c.LogDriver,
Config: utils.CopyMap(c.LogOpt),
},
NetworkMode: container.NetworkMode(c.Net),
ReadonlyRootfs: c.ReadOnly,
PidMode: container.PidMode(c.Pid),
UTSMode: container.UTSMode(c.Uts),
IpcMode: container.IpcMode(c.Ipc),
PortBindings: portBindings,
RestartPolicy: *restartPolicy,
SecurityOpt: utils.CopySlice(c.SecurityOpt),
VolumeDriver: c.VolumeDriver,
Resources: resources,
}
return config, hostConfig, nil
}
func getVolumesFrom(volumesFrom []string, serviceConfigs *project.Configs, projectName string) ([]string, error) {
volumes := []string{}
for _, volumeFrom := range volumesFrom {
if serviceConfigs.Has(volumeFrom) {
// It's a service - Use the first one
name := fmt.Sprintf("%s_%s_1", projectName, volumeFrom)
volumes = append(volumes, name)
} else {
volumes = append(volumes, volumeFrom)
}
}
return volumes, nil
}
func parseDevices(devices []string) ([]container.DeviceMapping, error) {
// parse device mappings
deviceMappings := []container.DeviceMapping{}
for _, device := range devices {
v, err := opts.ParseDevice(device)
if err != nil {
return nil, err
}
deviceMappings = append(deviceMappings, container.DeviceMapping{
PathOnHost: v.PathOnHost,
PathInContainer: v.PathInContainer,
CgroupPermissions: v.CgroupPermissions,
})
}
return deviceMappings, nil
}