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package main
import (
"context"
"fmt"
"log"
"os"
"time"
"github.com/docker/docker/api/types/container"
"github.com/docker/docker/api/types/mount"
"github.com/docker/docker/api/types/network"
"github.com/docker/docker/client"
)
const (
fixedDockerVersion = "1.38"
)
var (
dockerCtx context.Context
dockerCLI *client.Client
)
func setupContext() {
if dockerCtx == nil {
dockerCtx = context.Background()
}
}
func setupDockerCLI() (err error) {
os.Setenv("DOCKER_API_VERSION", "1.27")
if dockerCLI == nil {
dockerCLI, err = client.NewEnvClient()
}
return err
}
func spawnCompanion(username string, accesscode string) {
log.Println("Spwaning a new companion container")
// setup the context and the docker cli connection
setupContext()
setupDockerCLI()
sessionSalt := generateSessionSalt()
vpnRemoteAddress := "127.0.0.1"
vpnRemotePort := "1193"
log.Println("Generating the container config")
Config := &container.Config{
Image: "circus-companion:latest",
Cmd: []string{fmt.Sprintf("-username %s -accesscode %s -sessionSalt %s -vpnRemoteAddress %s -vpnRemotePort %s", username, accesscode, sessionSalt, vpnRemoteAddress, vpnRemotePort)},
// Container labels used by traefik
Labels: map[string]string{
"traefik.enable": "true",
"traefik.http.routers.companion.entrypoints": "web",
"traefik.http.routers.companion.rule": "Host(`companion.docker.localhost`)",
"traefik.http.services.companion.loadbalancer.server.port": "8080",
},
}
HostConfig := &container.HostConfig{
Mounts: []mount.Mount{
{
Type: mount.TypeBind,
Source: "/var/run/docker.sock",
Target: "/var/run/docker.sock",
},
{
Type: mount.TypeBind,
Source: "/etc/companion.json",
Target: "/etc/companion.json",
},
},
}
containerNetworkID, err := setupNetwork("circus", true)
NetworkingConfig := &network.NetworkingConfig{
EndpointsConfig: map[string]*network.EndpointSettings{
"circus": {
NetworkID: containerNetworkID,
},
},
}
log.Println("Starting the container")
_, err := dockerCLI.ContainerCreate(dockerCtx, Config, HostConfig, NetworkingConfig, "")
if err != nil {
panic(err)
}
log.Println("Container started")
}
func generateSessionSalt() string {
return fmt.Sprintf("%d", time.Now().UnixNano())
}
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