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https://github.com/containrrr/watchtower.git
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dd80aa4a0d
The --cleanup flag will cause watchtower to automatically remove the old image after a container is restart with a new image.
111 lines
2.3 KiB
Go
111 lines
2.3 KiB
Go
package actions
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import (
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"math/rand"
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"time"
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"github.com/CenturyLinkLabs/watchtower/container"
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log "github.com/Sirupsen/logrus"
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)
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var (
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letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
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waitTime = 10 * time.Second
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)
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func allContainersFilter(container.Container) bool { return true }
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func Update(client container.Client, cleanup bool) error {
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log.Info("Checking containers for updated images")
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containers, err := client.ListContainers(allContainersFilter)
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if err != nil {
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return err
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}
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for i, container := range containers {
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stale, err := client.IsContainerStale(container)
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if err != nil {
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return err
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}
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containers[i].Stale = stale
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}
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containers, err = container.SortByDependencies(containers)
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if err != nil {
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return err
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}
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checkDependencies(containers)
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// Stop stale containers in reverse order
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for i := len(containers) - 1; i >= 0; i-- {
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container := containers[i]
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if container.IsWatchtower() {
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continue
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}
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if container.Stale {
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if err := client.StopContainer(container, waitTime); err != nil {
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log.Error(err)
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}
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}
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}
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// Restart stale containers in sorted order
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for _, container := range containers {
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if container.Stale {
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// Since we can't shutdown a watchtower container immediately, we need to
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// start the new one while the old one is still running. This prevents us
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// from re-using the same container name so we first rename the current
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// instance so that the new one can adopt the old name.
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if container.IsWatchtower() {
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if err := client.RenameContainer(container, randName()); err != nil {
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log.Error(err)
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continue
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}
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}
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if err := client.StartContainer(container); err != nil {
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log.Error(err)
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}
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if cleanup {
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client.RemoveImage(container)
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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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func checkDependencies(containers []container.Container) {
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for i, parent := range containers {
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if parent.Stale {
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continue
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}
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LinkLoop:
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for _, linkName := range parent.Links() {
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for _, child := range containers {
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if child.Name() == linkName && child.Stale {
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containers[i].Stale = true
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break LinkLoop
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}
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}
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}
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}
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}
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// Generates a random, 32-character, Docker-compatible container name.
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func randName() string {
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b := make([]rune, 32)
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for i := range b {
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b[i] = letters[rand.Intn(len(letters))]
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}
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return string(b)
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}
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