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watchtower/internal/actions/check.go

84 lines
2.5 KiB
Go

package actions
import (
"fmt"
"sort"
"time"
"github.com/containrrr/watchtower/pkg/container"
"github.com/containrrr/watchtower/pkg/filters"
"github.com/containrrr/watchtower/pkg/sorter"
"github.com/containrrr/watchtower/pkg/types"
log "github.com/sirupsen/logrus"
)
// CheckForSanity makes sure everything is sane before starting
func CheckForSanity(client container.Client, filter types.Filter, rollingRestarts bool) error {
log.Debug("Making sure everything is sane before starting")
if rollingRestarts {
containers, err := client.ListContainers(filter)
if err != nil {
return err
}
for _, c := range containers {
if len(c.Links()) > 0 {
return fmt.Errorf(
"%q is depending on at least one other container. This is not compatible with rolling restarts",
c.Name(),
)
}
}
}
return nil
}
// CheckForMultipleWatchtowerInstances will ensure that there are not multiple instances of the
// watchtower running simultaneously. If multiple watchtower containers are detected, this function
// will stop and remove all but the most recently started container. This behaviour can be bypassed
// if a scope UID is defined.
func CheckForMultipleWatchtowerInstances(client container.Client, cleanup bool, scope string) error {
containers, err := client.ListContainers(filters.FilterByScope(scope, filters.WatchtowerContainersFilter))
if err != nil {
return err
}
if len(containers) <= 1 {
log.Debug("There are no additional watchtower containers")
return nil
}
log.Info("Found multiple running watchtower instances. Cleaning up.")
return cleanupExcessWatchtowers(containers, client, cleanup)
}
func cleanupExcessWatchtowers(containers []types.Container, client container.Client, cleanup bool) error {
var stopErrors int
sort.Sort(sorter.ByCreated(containers))
allContainersExceptLast := containers[0 : len(containers)-1]
for _, c := range allContainersExceptLast {
if err := client.StopContainer(c, 10*time.Minute); err != nil {
// logging the original here as we're just returning a count
log.WithError(err).Error("Could not stop a previous watchtower instance.")
stopErrors++
continue
}
if cleanup {
if err := client.RemoveImageByID(c.ImageID()); err != nil {
log.WithError(err).Warning("Could not cleanup watchtower images, possibly because of other watchtowers instances in other scopes.")
}
}
}
if stopErrors > 0 {
return fmt.Errorf("%d errors while stopping watchtower containers", stopErrors)
}
return nil
}