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watchtower/actions/check.go

36 lines
875 B
Go

package actions
import (
"sort"
"github.com/CenturyLinkLabs/watchtower/container"
)
func watchtowerContainersFilter(c container.Container) bool { return c.IsWatchtower() }
// CheckPrereqs 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.
func CheckPrereqs(client container.Client, cleanup bool) error {
containers, err := client.ListContainers(watchtowerContainersFilter)
if err != nil {
return err
}
if len(containers) > 1 {
sort.Sort(container.ByCreated(containers))
// Iterate over all containers execept the last one
for _, c := range containers[0 : len(containers)-1] {
client.StopContainer(c, 60)
if cleanup {
client.RemoveImage(c)
}
}
}
return nil
}