fix: handle missing healthcheck keys in config (#1810)

pkg/container/container.go

@@ -305,6 +305,7 @@ func (c Container) GetCreateConfig() *dockercontainer.Config {
 	}
 
 	// Clear HEALTHCHECK configuration (if default)
+	if config.Healthcheck != nil && imageConfig.Healthcheck != nil {
 		if util.SliceEqual(config.Healthcheck.Test, imageConfig.Healthcheck.Test) {
 			config.Healthcheck.Test = nil
 		}
@@ -324,6 +325,7 @@ func (c Container) GetCreateConfig() *dockercontainer.Config {
 		if config.Healthcheck.StartPeriod == imageConfig.Healthcheck.StartPeriod {
 			config.Healthcheck.StartPeriod = 0
 		}
+	}
 
 	config.Env = util.SliceSubtract(config.Env, imageConfig.Env)
 

pkg/container/container_test.go

@@ -124,6 +124,36 @@ var _ = Describe("the container", func() {
 				}))
 			})
 		})
+		When("container healthcheck config is empty", func() {
+			It("should not panic", func() {
+				c := MockContainer(WithImageHealthcheck(dc.HealthConfig{
+					Test:        []string{"/usr/bin/sleep", "10s"},
+					Interval:    10,
+					Timeout:     60,
+					StartPeriod: 30,
+					Retries:     10,
+				}))
+				Expect(c.GetCreateConfig().Healthcheck).To(BeNil())
+			})
+		})
+		When("container image healthcheck config is empty", func() {
+			It("should not panic", func() {
+				c := MockContainer(WithHealthcheck(dc.HealthConfig{
+					Test:        []string{"/usr/bin/sleep", "1s"},
+					Interval:    30,
+					Timeout:     30,
+					StartPeriod: 10,
+					Retries:     2,
+				}))
+				Expect(c.GetCreateConfig().Healthcheck).To(Equal(&dc.HealthConfig{
+					Test:        []string{"/usr/bin/sleep", "1s"},
+					Interval:    30,
+					Timeout:     30,
+					StartPeriod: 10,
+					Retries:     2,
+				}))
+			})
+		})
 	})
 	When("asked for metadata", func() {
 		var c *Container