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watchtower/pkg/container/metadata.go

54 lines
2.1 KiB
Go

package container
const (
watchtowerLabel = "com.centurylinklabs.watchtower"
signalLabel = "com.centurylinklabs.watchtower.stop-signal"
enableLabel = "com.centurylinklabs.watchtower.enable"
dependsOnLabel = "com.centurylinklabs.watchtower.depends-on"
zodiacLabel = "com.centurylinklabs.zodiac.original-image"
preCheckLabel = "com.centurylinklabs.watchtower.lifecycle.pre-check"
postCheckLabel = "com.centurylinklabs.watchtower.lifecycle.post-check"
preUpdateLabel = "com.centurylinklabs.watchtower.lifecycle.pre-update"
postUpdateLabel = "com.centurylinklabs.watchtower.lifecycle.post-update"
preUpdateTimeoutLabel = "com.centurylinklabs.watchtower.lifecycle.pre-update-timeout"
)
// GetLifecyclePreCheckCommand returns the pre-check command set in the container metadata or an empty string
func (c Container) GetLifecyclePreCheckCommand() string {
return c.getLabelValueOrEmpty(preCheckLabel)
}
// GetLifecyclePostCheckCommand returns the post-check command set in the container metadata or an empty string
func (c Container) GetLifecyclePostCheckCommand() string {
return c.getLabelValueOrEmpty(postCheckLabel)
}
// GetLifecyclePreUpdateCommand returns the pre-update command set in the container metadata or an empty string
func (c Container) GetLifecyclePreUpdateCommand() string {
return c.getLabelValueOrEmpty(preUpdateLabel)
}
// GetLifecyclePostUpdateCommand returns the post-update command set in the container metadata or an empty string
func (c Container) GetLifecyclePostUpdateCommand() string {
return c.getLabelValueOrEmpty(postUpdateLabel)
}
// ContainsWatchtowerLabel takes a map of labels and values and tells
// the consumer whether it contains a valid watchtower instance label
func ContainsWatchtowerLabel(labels map[string]string) bool {
val, ok := labels[watchtowerLabel]
return ok && val == "true"
}
func (c Container) getLabelValueOrEmpty(label string) string {
if val, ok := c.containerInfo.Config.Labels[label]; ok {
return val
}
return ""
}
func (c Container) getLabelValue(label string) (string, bool) {
val, ok := c.containerInfo.Config.Labels[label]
return val, ok
}