test: add test for running a rootless container

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

Closes: #871
Approved by: mheon

test/e2e/libpod_suite_test.go

@@ -168,8 +168,8 @@ func (p *PodmanTest) MakeOptions() []string {
 		p.CrioRoot, p.RunRoot, p.RunCBinary, p.ConmonBinary, p.CNIConfigDir), " ")
 }
 
-// Podman is the exec call to podman on the filesystem
+// Podman is the exec call to podman on the filesystem, uid and gid the credentials to use
-func (p *PodmanTest) Podman(args []string) *PodmanSession {
+func (p *PodmanTest) PodmanAsUser(args []string, uid, gid uint32, env []string) *PodmanSession {
 	podmanOptions := p.MakeOptions()
 	if os.Getenv("HOOK_OPTION") != "" {
 		podmanOptions = append(podmanOptions, os.Getenv("HOOK_OPTION"))
@@ -178,6 +178,15 @@ func (p *PodmanTest) Podman(args []string) *PodmanSession {
 	podmanOptions = append(podmanOptions, args...)
 	fmt.Printf("Running: %s %s\n", p.PodmanBinary, strings.Join(podmanOptions, " "))
 	command := exec.Command(p.PodmanBinary, podmanOptions...)
+
+	if uid != 0 || gid != 0 {
+		command.SysProcAttr = &syscall.SysProcAttr{}
+		command.SysProcAttr.Credential = &syscall.Credential{Uid: uid, Gid: gid}
+	}
+	if env != nil {
+		command.Env = env
+	}
+
 	session, err := gexec.Start(command, GinkgoWriter, GinkgoWriter)
 	if err != nil {
 		Fail(fmt.Sprintf("unable to run podman command: %s\n%v", strings.Join(podmanOptions, " "), err))
@@ -185,6 +194,11 @@ func (p *PodmanTest) Podman(args []string) *PodmanSession {
 	return &PodmanSession{session}
 }
 
+// Podman is the exec call to podman on the filesystem
+func (p *PodmanTest) Podman(args []string) *PodmanSession {
+	return p.PodmanAsUser(args, 0, 0, nil)
+}
+
 //WaitForContainer waits on a started container
 func WaitForContainer(p *PodmanTest) bool {
 	for i := 0; i < 10; i++ {

test/e2e/rootless_test.go

@@ -0,0 +1,97 @@
+package integration
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path/filepath"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("Podman rootless", func() {
+	var (
+		tempdir    string
+		err        error
+		podmanTest PodmanTest
+	)
+
+	BeforeEach(func() {
+		tempdir, err = CreateTempDirInTempDir()
+		if err != nil {
+			os.Exit(1)
+		}
+		podmanTest = PodmanCreate(tempdir)
+		podmanTest.RestoreAllArtifacts()
+	})
+
+	AfterEach(func() {
+		podmanTest.Cleanup()
+	})
+
+	It("podman rootless rootfs", func() {
+		// Check if we can create an user namespace
+		err := exec.Command("unshare", "-r", "echo", "hello").Run()
+		if err != nil {
+			Skip("User namespaces not supported.")
+		}
+
+		setup := podmanTest.Podman([]string{"create", ALPINE, "ls"})
+		setup.WaitWithDefaultTimeout()
+		Expect(setup.ExitCode()).To(Equal(0))
+		cid := setup.OutputToString()
+
+		mount := podmanTest.Podman([]string{"mount", cid})
+		mount.WaitWithDefaultTimeout()
+		Expect(mount.ExitCode()).To(Equal(0))
+		mountPath := mount.OutputToString()
+
+		chownFunc := func(p string, info os.FileInfo, err error) error {
+			if err != nil {
+				return err
+			}
+			return os.Lchown(p, 1000, 1000)
+		}
+
+		err = filepath.Walk(tempdir, chownFunc)
+		if err != nil {
+			fmt.Printf("cannot chown the directory: %q\n", err)
+			os.Exit(1)
+		}
+
+		runRootless := func(mountPath string) {
+			tempdir, err := CreateTempDirInTempDir()
+			Expect(err).To(BeNil())
+			podmanTest := PodmanCreate(tempdir)
+			err = filepath.Walk(tempdir, chownFunc)
+			Expect(err).To(BeNil())
+
+			xdgRuntimeDir, err := ioutil.TempDir("/run", "")
+			Expect(err).To(BeNil())
+			defer os.RemoveAll(xdgRuntimeDir)
+			err = filepath.Walk(xdgRuntimeDir, chownFunc)
+			Expect(err).To(BeNil())
+
+			home, err := CreateTempDirInTempDir()
+			Expect(err).To(BeNil())
+			err = filepath.Walk(xdgRuntimeDir, chownFunc)
+			Expect(err).To(BeNil())
+
+			env := os.Environ()
+			env = append(env, fmt.Sprintf("XDG_RUNTIME_DIR=%s", xdgRuntimeDir))
+			env = append(env, fmt.Sprintf("HOME=%s", home))
+			cmd := podmanTest.PodmanAsUser([]string{"run", "--rootfs", mountPath, "echo", "hello"}, 1000, 1000, env)
+			cmd.WaitWithDefaultTimeout()
+			Expect(cmd.LineInOutputContains("hello")).To(BeTrue())
+			Expect(cmd.ExitCode()).To(Equal(0))
+		}
+
+		runRootless(mountPath)
+
+		umount := podmanTest.Podman([]string{"umount", cid})
+		umount.WaitWithDefaultTimeout()
+		Expect(umount.ExitCode()).To(Equal(0))
+	})
+})