add podman container|image exists

Add an exists subcommand to podman container and podman image that allows
users to verify the existence of a container or image by ID or name.  The return
code can be 0 (success), 1 (failed to find), or 125 (failed to work with runtime).

Issue #1845

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

test/e2e/exists_test.go

@@ -0,0 +1,85 @@
+package integration
+
+import (
+	"fmt"
+	"os"
+
+	. "github.com/containers/libpod/test/utils"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("Podman image|container exists", func() {
+	var (
+		tempdir    string
+		err        error
+		podmanTest *PodmanTestIntegration
+	)
+
+	BeforeEach(func() {
+		tempdir, err = CreateTempDirInTempDir()
+		if err != nil {
+			os.Exit(1)
+		}
+		podmanTest = PodmanTestCreate(tempdir)
+		podmanTest.RestoreAllArtifacts()
+	})
+
+	AfterEach(func() {
+		podmanTest.Cleanup()
+		f := CurrentGinkgoTestDescription()
+		timedResult := fmt.Sprintf("Test: %s completed in %f seconds", f.TestText, f.Duration.Seconds())
+		GinkgoWriter.Write([]byte(timedResult))
+
+	})
+	It("podman image exists in local storage by fq name", func() {
+		session := podmanTest.Podman([]string{"image", "exists", ALPINE})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(0))
+	})
+	It("podman image exists in local storage by short name", func() {
+		session := podmanTest.Podman([]string{"image", "exists", "alpine"})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(0))
+	})
+	It("podman image does not exist in local storage", func() {
+		session := podmanTest.Podman([]string{"image", "exists", "alpine9999"})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(1))
+	})
+	It("podman container exists in local storage by name", func() {
+		setup := podmanTest.RunTopContainer("foobar")
+		setup.WaitWithDefaultTimeout()
+		Expect(setup.ExitCode()).To(Equal(0))
+
+		session := podmanTest.Podman([]string{"container", "exists", "foobar"})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(0))
+	})
+	It("podman container exists in local storage by container ID", func() {
+		setup := podmanTest.RunTopContainer("")
+		setup.WaitWithDefaultTimeout()
+		Expect(setup.ExitCode()).To(Equal(0))
+		cid := setup.OutputToString()
+
+		session := podmanTest.Podman([]string{"container", "exists", cid})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(0))
+	})
+	It("podman container exists in local storage by short container ID", func() {
+		setup := podmanTest.RunTopContainer("")
+		setup.WaitWithDefaultTimeout()
+		Expect(setup.ExitCode()).To(Equal(0))
+		cid := setup.OutputToString()[0:12]
+
+		session := podmanTest.Podman([]string{"container", "exists", cid})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(0))
+	})
+	It("podman container does not exist in local storage", func() {
+		session := podmanTest.Podman([]string{"container", "exists", "foobar"})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(1))
+	})
+
+})