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88 lines
2.3 KiB
Go
88 lines
2.3 KiB
Go
package actions
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import (
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"errors"
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"fmt"
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"sort"
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"strings"
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"time"
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"github.com/containrrr/watchtower/pkg/filters"
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"github.com/containrrr/watchtower/pkg/sorter"
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"github.com/opencontainers/runc/Godeps/_workspace/src/github.com/Sirupsen/logrus"
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log "github.com/sirupsen/logrus"
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"github.com/containrrr/watchtower/pkg/container"
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)
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// CheckForMultipleWatchtowerInstances will ensure that there are not multiple instances of the
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// watchtower running simultaneously. If multiple watchtower containers are detected, this function
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// will stop and remove all but the most recently started container.
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func CheckForMultipleWatchtowerInstances(client container.Client, cleanup bool) error {
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awaitDockerClient()
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containers, err := client.ListContainers(filters.WatchtowerContainersFilter)
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if err != nil {
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log.Fatal(err)
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return err
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}
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if len(containers) <= 1 {
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log.Debug("There are no additional watchtower containers")
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return nil
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}
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log.Info("Found multiple running watchtower instances. Cleaning up.")
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return cleanupExcessWatchtowers(containers, client, cleanup)
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}
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func cleanupExcessWatchtowers(containers []container.Container, client container.Client, cleanup bool) error {
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var cleanupErrors int
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var stopErrors int
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sort.Sort(sorter.ByCreated(containers))
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allContainersExceptLast := containers[0 : len(containers)-1]
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for _, c := range allContainersExceptLast {
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if err := client.StopContainer(c, 10*time.Minute); err != nil {
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// logging the original here as we're just returning a count
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logrus.Error(err)
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stopErrors++
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continue
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}
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if cleanup {
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if err := client.RemoveImageByID(c.ImageID()); err != nil {
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// logging the original here as we're just returning a count
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logrus.Error(err)
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cleanupErrors++
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}
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}
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}
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return createErrorIfAnyHaveOccurred(stopErrors, cleanupErrors)
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}
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func createErrorIfAnyHaveOccurred(c int, i int) error {
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if c == 0 && i == 0 {
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return nil
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}
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var output strings.Builder
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if c > 0 {
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output.WriteString(fmt.Sprintf("%d errors while stopping containers", c))
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}
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if i > 0 {
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output.WriteString(fmt.Sprintf("%d errors while cleaning up images", c))
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}
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return errors.New(output.String())
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}
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func awaitDockerClient() {
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log.Debug("Sleeping for a second to ensure the docker api client has been properly initialized.")
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time.Sleep(1 * time.Second)
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}
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