Add container environment variables correctly to the health check

The health check process doesn't have all the environment
varialbes in the container or has them set incorrectly.

This patch should fix that problem.

Signed-off-by: Boaz Shuster <ripcurld.github@gmail.com>
(cherry picked from commit 5836d86ac4d617e837d94010aa60384648ab59ea)
Signed-off-by: Eli Uriegas <eli.uriegas@docker.com>

components/engine/daemon/health.go

@@ -64,31 +64,35 @@ type cmdProbe struct {
 
 // exec the healthcheck command in the container.
 // Returns the exit code and probe output (if any)
-func (p *cmdProbe) run(ctx context.Context, d *Daemon, container *container.Container) (*types.HealthcheckResult, error) {
-
-	cmdSlice := strslice.StrSlice(container.Config.Healthcheck.Test)[1:]
+func (p *cmdProbe) run(ctx context.Context, d *Daemon, cntr *container.Container) (*types.HealthcheckResult, error) {
+	cmdSlice := strslice.StrSlice(cntr.Config.Healthcheck.Test)[1:]
 	if p.shell {
-		cmdSlice = append(getShell(container.Config), cmdSlice...)
+		cmdSlice = append(getShell(cntr.Config), cmdSlice...)
 	}
 	entrypoint, args := d.getEntrypointAndArgs(strslice.StrSlice{}, cmdSlice)
 	execConfig := exec.NewConfig()
 	execConfig.OpenStdin = false
 	execConfig.OpenStdout = true
 	execConfig.OpenStderr = true
-	execConfig.ContainerID = container.ID
+	execConfig.ContainerID = cntr.ID
 	execConfig.DetachKeys = []byte{}
 	execConfig.Entrypoint = entrypoint
 	execConfig.Args = args
 	execConfig.Tty = false
 	execConfig.Privileged = false
-	execConfig.User = container.Config.User
-	execConfig.Env = container.Config.Env
+	execConfig.User = cntr.Config.User
 
-	d.registerExecCommand(container, execConfig)
-	d.LogContainerEvent(container, "exec_create: "+execConfig.Entrypoint+" "+strings.Join(execConfig.Args, " "))
+	linkedEnv, err := d.setupLinkedContainers(cntr)
+	if err != nil {
+		return nil, err
+	}
+	execConfig.Env = container.ReplaceOrAppendEnvValues(cntr.CreateDaemonEnvironment(execConfig.Tty, linkedEnv), execConfig.Env)
+
+	d.registerExecCommand(cntr, execConfig)
+	d.LogContainerEvent(cntr, "exec_create: "+execConfig.Entrypoint+" "+strings.Join(execConfig.Args, " "))
 
 	output := &limitedBuffer{}
-	err := d.ContainerExecStart(ctx, execConfig.ID, nil, output, output)
+	err = d.ContainerExecStart(ctx, execConfig.ID, nil, output, output)
 	if err != nil {
 		return nil, err
 	}
@@ -97,7 +101,7 @@ func (p *cmdProbe) run(ctx context.Context, d *Daemon, container *container.Cont
 		return nil, err
 	}
 	if info.ExitCode == nil {
-		return nil, fmt.Errorf("Healthcheck for container %s has no exit code!", container.ID)
+		return nil, fmt.Errorf("Healthcheck for container %s has no exit code!", cntr.ID)
 	}
 	// Note: Go's json package will handle invalid UTF-8 for us
 	out := output.String()

components/engine/integration-cli/docker_cli_health_test.go

@@ -139,3 +139,26 @@ func (s *DockerSuite) TestHealth(c *check.C) {
 	c.Check(out, checker.Equals, "[CMD cat /my status]\n")
 
 }
+
+// Github #33021
+func (s *DockerSuite) TestUnsetEnvVarHealthCheck(c *check.C) {
+	testRequires(c, DaemonIsLinux) // busybox doesn't work on Windows
+
+	imageName := "testhealth"
+	buildImageSuccessfully(c, imageName, build.WithDockerfile(`FROM busybox
+HEALTHCHECK --interval=1s --timeout=5s --retries=5 CMD /bin/sh -c "sleep 1"
+ENTRYPOINT /bin/sh -c "sleep 600"`))
+
+	name := "env_test_health"
+	// No health status before starting
+	dockerCmd(c, "run", "-d", "--name", name, "-e", "FOO", imageName)
+	defer func() {
+		dockerCmd(c, "rm", "-f", name)
+		dockerCmd(c, "rmi", imageName)
+	}()
+
+	// Start
+	dockerCmd(c, "start", name)
+	waitForHealthStatus(c, name, "starting", "healthy")
+
+}