Add ability for ubuntu to be tested

unfortunately the papr CI system cannot test ubuntu as a VM; therefore,
this PR still keeps travis.  but it does include fixes that will be required
for running on modern versions of ubuntu.

Signed-off-by: baude <bbaude@redhat.com>

test/e2e/libpod_suite_test.go

@@ -63,6 +63,7 @@ type PodmanTest struct {
 	ArtifactPath        string
 	TempDir             string
 	CgroupManager       string
+	Host                HostOS
 }
 
 // HostOS is a simple struct for the test os
@@ -126,6 +127,7 @@ func CreateTempDirInTempDir() (string, error) {
 // PodmanCreate creates a PodmanTest instance for the tests
 func PodmanCreate(tempDir string) PodmanTest {
 
+	host := GetHostDistributionInfo()
 	cwd, _ := os.Getwd()
 
 	podmanBinary := filepath.Join(cwd, "../../bin/podman")
@@ -149,7 +151,19 @@ func PodmanCreate(tempDir string) PodmanTest {
 		cgroupManager = os.Getenv("CGROUP_MANAGER")
 	}
 
-	runCBinary := "/usr/bin/runc"
+	// Ubuntu doesn't use systemd cgroups
+	if host.Distribution == "ubuntu" {
+		cgroupManager = "cgroupfs"
+	}
+
+	runCBinary, err := exec.LookPath("runc")
+	// If we cannot find the runc binary, setting to something static as we have no way
+	// to return an error.  The tests will fail and point out that the runc binary could
+	// not be found nicely.
+	if err != nil {
+		runCBinary = "/usr/bin/runc"
+	}
+
 	CNIConfigDir := "/etc/cni/net.d"
 
 	p := PodmanTest{
@@ -164,6 +178,7 @@ func PodmanCreate(tempDir string) PodmanTest {
 		ArtifactPath:        ARTIFACT_DIR,
 		TempDir:             tempDir,
 		CgroupManager:       cgroupManager,
+		Host:                host,
 	}
 
 	// Setup registries.conf ENV variable

test/e2e/run_cgroup_parent_test.go

@@ -45,7 +45,7 @@ var _ = Describe("Podman run with --cgroup-parent", func() {
 
 	Specify("no --cgroup-parent", func() {
 		cgroup := "/libpod_parent"
-		if !containerized() {
+		if !containerized() && podmanTest.CgroupManager != "cgroupfs" {
 			cgroup = "/machine.slice"
 		}
 		run := podmanTest.Podman([]string{"run", fedoraMinimal, "cat", "/proc/self/cgroup"})
@@ -56,7 +56,7 @@ var _ = Describe("Podman run with --cgroup-parent", func() {
 	})
 
 	Specify("valid --cgroup-parent using slice", func() {
-		if containerized() {
+		if containerized() || podmanTest.CgroupManager == "cgroupfs" {
 			Skip("Requires Systemd cgroup manager support")
 		}
 		cgroup := "aaaa.slice"

test/e2e/run_memory_test.go

@@ -39,6 +39,9 @@ var _ = Describe("Podman run memory", func() {
 	})
 
 	It("podman run memory-reservation test", func() {
+		if podmanTest.Host.Distribution == "ubuntu" {
+			Skip("Unable to perform test on Ubuntu distributions due to memory management")
+		}
 		session := podmanTest.Podman([]string{"run", "--memory-reservation=40m", ALPINE, "cat", "/sys/fs/cgroup/memory/memory.soft_limit_in_bytes"})
 		session.WaitWithDefaultTimeout()
 		Expect(session.ExitCode()).To(Equal(0))