healthcheck: reject empty commands
An image with "HEALTHCHECK CMD ['']" is valid but as there is no command
defined the healthcheck will fail. Reject such a configuration.
Fixes
@@ -123,6 +123,9 @@ func (c *Container) runHealthCheck() (HealthCheckStatus, error) {
// command supplied on command line - pass as-is
newCommand = hcCommand
}
+ if len(newCommand) < 1 || newCommand[0] == "" {
+ return HealthCheckNotDefined, errors.Errorf("container %s has no defined healthcheck", c.ID())
+ }
captureBuffer := bufio.NewWriter(&capture)
hcw := hcWriteCloser{
captureBuffer,
