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131 lines
3.0 KiB
Go
131 lines
3.0 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/containrrr/watchtower/pkg/container"
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t "github.com/containrrr/watchtower/pkg/types"
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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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)
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// UpdateParams contains all different options available to alter the behavior of the Update func
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type UpdateParams struct {
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Filter t.Filter
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Cleanup bool
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NoRestart bool
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Timeout time.Duration
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MonitorOnly bool
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}
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// Update looks at the running Docker containers to see if any of the images
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// used to start those containers have been updated. If a change is detected in
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// any of the images, the associated containers are stopped and restarted with
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// the new image.
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func Update(client container.Client, params UpdateParams) error {
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log.Debug("Checking containers for updated images")
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containers, err := client.ListContainers(params.Filter)
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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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log.Infof("Unable to update container %s. Proceeding to next.", containers[i].Name())
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log.Debug(err)
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stale = false
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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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if params.MonitorOnly {
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return nil
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}
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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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log.Debugf("This is the watchtower container %s", containers[i].Name())
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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, params.Timeout); 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 !params.NoRestart {
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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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}
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if params.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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