You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
watchtower/container/container.go

105 lines
2.9 KiB
Go

package container
import (
"fmt"
"strings"
"github.com/samalba/dockerclient"
)
func NewContainer(containerInfo *dockerclient.ContainerInfo, imageInfo *dockerclient.ImageInfo) *Container {
return &Container{
containerInfo: containerInfo,
imageInfo: imageInfo,
}
}
type Container struct {
Stale bool
containerInfo *dockerclient.ContainerInfo
imageInfo *dockerclient.ImageInfo
}
func (c Container) Name() string {
return c.containerInfo.Name
}
func (c Container) Links() []string {
var links []string
if (c.containerInfo != nil) && (c.containerInfo.HostConfig != nil) {
for _, link := range c.containerInfo.HostConfig.Links {
name := strings.Split(link, ":")[0]
links = append(links, name)
}
}
return links
}
func (c Container) IsWatchtower() bool {
val, ok := c.containerInfo.Config.Labels["com.centurylinklabs.watchtower"]
return ok && val == "true"
}
// Ideally, we'd just be able to take the ContainerConfig from the old container
// and use it as the starting point for creating the new container; however,
// the ContainerConfig that comes back from the Inspect call merges the default
// configuration (the stuff specified in the metadata for the image itself)
// with the overridden configuration (the stuff that you might specify as part
// of the "docker run"). In order to avoid unintentionally overriding the
// defaults in the new image we need to separate the override options from the
// default options. To do this we have to compare the ContainerConfig for the
// running container with the ContainerConfig from the image that container was
// started from. This function returns a ContainerConfig which contains just
// the options overridden at runtime.
func (c Container) runtimeConfig() *dockerclient.ContainerConfig {
config := c.containerInfo.Config
imageConfig := c.imageInfo.Config
if config.WorkingDir == imageConfig.WorkingDir {
config.WorkingDir = ""
}
if config.User == imageConfig.User {
config.User = ""
}
if sliceEqual(config.Cmd, imageConfig.Cmd) {
config.Cmd = nil
}
if sliceEqual(config.Entrypoint, imageConfig.Entrypoint) {
config.Entrypoint = nil
}
config.Env = sliceSubtract(config.Env, imageConfig.Env)
config.Labels = stringMapSubtract(config.Labels, imageConfig.Labels)
config.Volumes = structMapSubtract(config.Volumes, imageConfig.Volumes)
config.ExposedPorts = structMapSubtract(config.ExposedPorts, imageConfig.ExposedPorts)
for p := range c.containerInfo.HostConfig.PortBindings {
config.ExposedPorts[p] = struct{}{}
}
return config
}
// Any links in the HostConfig need to be re-written before they can be
// re-submitted to the Docker create API.
func (c Container) hostConfig() *dockerclient.HostConfig {
hostConfig := c.containerInfo.HostConfig
for i, link := range hostConfig.Links {
name := link[0:strings.Index(link, ":")]
alias := link[strings.LastIndex(link, "/"):]
hostConfig.Links[i] = fmt.Sprintf("%s:%s", name, alias)
}
return hostConfig
}