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add pre/post update check lifecycle hooks (#373)

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* add pre/post update check lifecycle hooks

* update docs for lifecycle hooks

* Fix phrasing
This commit is contained in:
Niklas Wigertz Danielsson 2019-09-15 16:58:46 +02:00 • committed by Simon Aronsson
parent 1b3db5ed5d
commit 135467dcf6
3 changed files with 87 additions and 15 deletions
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12
pkg/container/metadata.go
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@ -5,10 +5,22 @@ const (
signalLabel = "com.centurylinklabs.watchtower.stop-signal"
enableLabel = "com.centurylinklabs.watchtower.enable"
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"
)
// 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)