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84 lines
2.5 KiB
Go
84 lines
2.5 KiB
Go
package actions
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import (
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"fmt"
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"sort"
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"time"
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"github.com/containrrr/watchtower/pkg/container"
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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/containrrr/watchtower/pkg/types"
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log "github.com/sirupsen/logrus"
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)
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// CheckForSanity makes sure everything is sane before starting
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func CheckForSanity(client container.Client, filter types.Filter, rollingRestarts bool) error {
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log.Debug("Making sure everything is sane before starting")
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if rollingRestarts {
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containers, err := client.ListContainers(filter)
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if err != nil {
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return err
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}
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for _, c := range containers {
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if len(c.Links()) > 0 {
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return fmt.Errorf(
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"%q is depending on at least one other container. This is not compatible with rolling restarts",
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c.Name(),
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)
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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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// 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. This behaviour can be bypassed
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// if a scope UID is defined.
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func CheckForMultipleWatchtowerInstances(client container.Client, cleanup bool, scope string) error {
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containers, err := client.ListContainers(filters.FilterByScope(scope, filters.WatchtowerContainersFilter))
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if err != nil {
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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 []types.Container, client container.Client, cleanup bool) error {
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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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log.WithError(err).Error("Could not stop a previous watchtower instance.")
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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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log.WithError(err).Warning("Could not cleanup watchtower images, possibly because of other watchtowers instances in other scopes.")
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}
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}
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}
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if stopErrors > 0 {
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return fmt.Errorf("%d errors while stopping watchtower containers", stopErrors)
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}
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return nil
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}
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